BACKGROUND: Pulmonary complications after orthoto- pic liver transplantation (OLT) include high morbidity and mortality. Experimental data have suggested hepatic ische- mia and reperfusion are induced by pro-inflammat...BACKGROUND: Pulmonary complications after orthoto- pic liver transplantation (OLT) include high morbidity and mortality. Experimental data have suggested hepatic ische- mia and reperfusion are induced by pro-inflammatory cyto- kines. The high level of inflammatory cytokines might ad- ditionally influence pulmonary cappillary fluid filtration. The objectives of this study were to measure the concentra- tions of tumor necrotic factor-alpha (TNF-α), interleukin- 6 (IL-6) and interleukin-8 (IL-8) during OLT and to in- vestigate the relationship between these cytokines and post- operative pulmonary complications. METHODS: Twenty-two patients undergoing OLT were divided into two groups according to whether they had postoperative pulmonary complications: group A consis- ting of 8 patients with postoperative pulmonary complica- tions , and group B consisting of 14 patients without post- operative pulmonary complications. Enzyme-linked im- munoassay (ELISA) was used to determine serum TNF-α, IL-6 and IL-8. Blood samples were taken at the beginning of operation (T0 ), clamping and cross-clamping of the in- ferior cava and portal vein (T1, T2 ), 90 minutes and 3 hours after reperfusion (T3 , T4 ) and 24 hours after opera- tion (T5). RESULTS: The level of PaO2/FiO2 in group A was lower than that in group B ( P <0. 05 ). The concentrations of TNF-α, IL-6 and IL-8 in the two groups increased rapidly at T2 , peaked at T3 , decreased rapidly after T3 until 24 hours after operation. The concentrations of TNF-α, IL-6 and IL-8 in group A were higher than those in group B at T2, T3, and T4(P<0.05). CONCLUSION: After un-clamping of the inferior cava and portal vein, the serum concentrations of TNF-α, IL-6 and IL-8 increased may be related to pulmonary injury after he- patic ischemic reperfusion.展开更多
Helicobacter pylori(H.pylori)is a major etiological factor in the development of gastric cancer.Large-scale epidemiological studies have confirmed the strong association between H.pylori infection and both cancer deve...Helicobacter pylori(H.pylori)is a major etiological factor in the development of gastric cancer.Large-scale epidemiological studies have confirmed the strong association between H.pylori infection and both cancer development and progression.Interleukin-8(IL-8)is overexpressed in gastric mucosa exposed to H.pylori.The expression of IL-8 directly correlates with a poor prognosis in gastric cancer.IL-8 is multifunctional.In addition to its potent chemotactic activity,it can induce proliferation and migration of cancer cells.In this review,we focus on recent insights into the mechanisms of IL-8 signaling associated with gastric cancer.The relationship between IL-8 and H.pylori is discussed.We also summarize the current therapeutics against IL-8 in gastric cancer.展开更多
AIM:To investigate the interaction between Xiaotan Sanjie(XTSJ) decoction and interleukin-8(IL-8) and its effect on adhesion,migration and invasion of SGC-7901 gastric cancer cells.METHODS:SGC-7901 gastric cancer cell...AIM:To investigate the interaction between Xiaotan Sanjie(XTSJ) decoction and interleukin-8(IL-8) and its effect on adhesion,migration and invasion of SGC-7901 gastric cancer cells.METHODS:SGC-7901 gastric cancer cells were exposed to serum containing XTSJ decoction and/orIL-8(1 ng/m L).SGC-7901 cell adhesion to fibronectin,an extracellular matrix component,was detected using the Cell Counting Kit-8.Migration and invasion abilities of SGC-7901 cells were detected by scratch wound and Transwell chamber assays.Then,protein(immunofluorescence and Western blot) and m RNA levels(quantitative polymerase chain reaction) of cluster of differentiation 44(CD44),a cell adhesion molecule,were measured in 72-h-cultured SGC-7901 cells.RESULTS:Cell adhesion was promoted by IL-8(P = 0.001),but was inhibited by XTSJ decoction(P = 0.0001).Similarly,IL-8 promoted SGC-7901 cell invasion(P = 0.003),and XTSJ decoction inhibited cell invasion(P = 0.001).IL-8 induced SGC-7901 cell migration,but this was inhibited by XTSJ decoction.IL-8 up-regulated CD44 protein(P = 0.028) and m RNA expression(P = 0.002),whereas XTSJ decoction inhibited CD44 protein expression(P = 0.0001),but not m RNA expression(P = 0.275).An interaction between XTSJ decoction and IL-8 was confirmed in the invasion(P = 0.001) and CD44 m RNA expression of SGC-7901 cells(P = 0.010),but not in cell adhesion(P = 0.051).CONCLUSION:XTSJ decoction may inhibit adhesion,migration and invasion of gastric cancer cells,which is partly associated with down-regulation of IL-8.展开更多
BACKGROUND: Interleukin-18 (IL-18), a pro-inflamma- tory cytokine that induces interferon-γ (IFN-γ) production in T cells and natural killer cells, plays a critical role in the T-lymphocyte helper type 1 ( Th1) resp...BACKGROUND: Interleukin-18 (IL-18), a pro-inflamma- tory cytokine that induces interferon-γ (IFN-γ) production in T cells and natural killer cells, plays a critical role in the T-lymphocyte helper type 1 ( Th1) response. This study was designed to explore the effect of IL-18 on peripheral blood mononuclear cells ( PBMCs) derived from chronic hepatitis B (CHB) and on hepatitis B virus (HBV) DNA released by HepG2.2.15 cell lines, which were transfected with hepatitis B virus gene in vitro. METHODS: PBMCs isolated from 25 healthy people and 25 patients with CHB were stimulated with HBcAg and IL-18 of various concentrations for 72 hours. The levels of IFN-γ in the supernatants of cultured PBMCs were determined by ELISA. After the stimulation of IL-18 of various concentra- tions, PBMCs derived from one patient were co-cultured for 96 hours with HepG2. 2. 15 cells which had been cul- tured for 24 hours, and then the supernatants were collected by centrifugation and used for HBV DNA quantitative as- say. RESULTS: When PBMCs were stimulated by HBcAg and IL-18 at various concentrations, the levels of IFN-γ in the supernatants of CHB groups were much higher than those in normal control groups, at 0.2 ng/ml: t =11.70, P< 0.01; at 1.0 ng/ml: t =16.19, P<0.01; and at5.0 ng/ml: t =20.12, P <0.01. In the CHB groups, the levels of IFN-γ in the supernatants of PBMCs stimulated by HBcAg alone were lower than both those stimulated by HBcAg and EL-18 at various concentrations and those stimulated by HBcAg and EL-18 (5.0 ng/ml) together with EL-12 (mild: t = 2.20, P<0.05; moderate; t=2.97, P<0.05; severe; t = 0.66, P >0.05). The content of HBV DNA in the superna- tant of co-cultivation of HepG2. 2. 15 cells and PBMCs without stimulated materials was higher than that stimula-ted by HBcAg and EL-18 at various concentrations of HBc- Ag and IL-18 together with IL-12/IFN-α1lb. CONCLUSION: DL-18 can induce IFN-γ secretion and pro- bably play a key role in the modulation of both innate and adaptive immunity. It has implications in improving im- munoregulatory effect and increasing the ability of immune cells to kill cells infected by virus.展开更多
AIM:To assess the diagnostic value of serum interleukin-8(IL-8)in the detection of colorectal cancer(CRC).METHODS:An original study was conducted to explore the potential value of IL-8 in CRC diagnosis.Receiver operat...AIM:To assess the diagnostic value of serum interleukin-8(IL-8)in the detection of colorectal cancer(CRC).METHODS:An original study was conducted to explore the potential value of IL-8 in CRC diagnosis.Receiver operating characteristic(ROC)analysis was performed and the area under the curve(AUC)value was calculated.PUBMED and EMBASE were searched(to October,2013),supplemented with manual screening for relevant publications.Meta-analysis methods were applied to pool sensitivity,specificity,positive and negative likelihood ratios,and diagnostic odds ratios and to construct a summary receiver-operating characteristic(s ROC)curve.Heterogeneity across studies was checked by the I2 test and Deek’s funnel plot method was applied to test publication bias.RESULTS:In our original study,serum IL-8 yielded an AUC of 0.742[95%CI:0.635-0.849].The sensitivity and specificity were 85.42%and 54.05%,respectively,at a cut-off value of 5.39.In this meta-analysis,we included five studies with 668 CRC patients and 374controls and one study in our own center with 48 CRC patients and 37 controls.The pooled sensitivity and specificity of IL-8 were 0.69(95%CI:0.42-0.87)and0.85(95%CI:0.68-0.94)for CRC detection.Besides,the area under the s ROC curve was 0.86(95%CI:0.82-0.88).Subgroup analysis suggested that there was no heterogeneity in the Asian subgroup but some in the European subgroup.In addition,no publication bias was found according to the Deek’s funnel plot asymmetry test.CONCLUSION:Serum IL-8 is a promising biomarker for CRC detection and may become a clinically useful tool to identify high-risk patients.展开更多
Pigment epithelium-derived factor (PEDF) is an antiangiogenic factor which is effective in tumour inhibition in a variety of tumours and has not yet been studied in bladder tumour before. In this study the expressio...Pigment epithelium-derived factor (PEDF) is an antiangiogenic factor which is effective in tumour inhibition in a variety of tumours and has not yet been studied in bladder tumour before. In this study the expression of PEDF, interleukin-1α (IL-1α) and -8 (IL-8) in bladder tumours was investigated. Immunohistochemistry was performed on 64 bladder tumour and 23 normal uroepithelium samples. Expression change of the factors was compared with clinicopathological parameters. Correlations between PEDF, IL-1α and IL-8 were analyzed. None of the factors was in relation to gender, tumour occurrence, and size or onset pattern. PEDF (P=0.014) and IL-1α (P=0.049) expression was down-regulated with grade progression. PEDF expression was lower in normal uroepithelium than in papillary urothelial neoplasm of low malignant potential (PUNLMP) (P=0.000) and carcinoma (P=0.009) whilst IL-1α (P=0.000 and P=0.000 respectively) and IL-8 (P=0.000 and P=0.023 respectively) expression was higher in the same grouping. PEDF expression had a negative correlation with IL-8 in PUNLMP (P=0.049, r=-0.578) as well as in tumour grouping (P=0.033, r=-0.276). Deranged expressional change of PEDF, IL-1α and IL-8 could be in relation to loss of differentiation from normal uroepithelium to papillary lesion and eventually to carcinoma.展开更多
AIM:To evaluate(1) the association of the Helicobacter pylori(H.pylori) test and interleukin-8(IL-8) m RNA expression alone and the severity of gastric cancer(GC);(2) the association of both tests were added to patien...AIM:To evaluate(1) the association of the Helicobacter pylori(H.pylori) test and interleukin-8(IL-8) m RNA expression alone and the severity of gastric cancer(GC);(2) the association of both tests were added to patients' characteristics to identifli Thai suspected patients of gastric cancer who would receive the most benefit; and(3) diagnostic value of levels of IL-8 m RNA expression for gastric cancer.METHODS: A cross-sectional analytical study was completed with 220 patients with 86 GC patients who underwent endoscopy with gastric surgery divided into non-metastasis and metastasis groups,and 134 patients with benign lesions who underwent endoscopic examination,at the Gastrointestinal Surgery and Endoscopy Unit,Chiang Mai University Hospital between 2006 and 2010. Of 220 patients,86 cases of diagnosed gastric adenocarcinoma were in an advanced stage and 134 cases were non-cancer patients. RESULTS: The IL-8 m RNA expression showed predominant association with advanced GC when compared to H. pylori infection alone [OR(95%CI); 0.86(0.49-1.53) vs 5.44(3.08-9.62)] when including the patients' characteristics the highest of the area under the receiver operating characteristic curves(Au ROC) of the model were males older than 40 years of age [AuROC(95%CI); 0.81(0.75-0.86)]. However,preliminary testing for diagnostic indices of four cut-off points of IL-8 m RNA expression to predict the severity of GC cases found an increasing suboptimal trend from the likelihood ratio of positive to differentiate the severity in the GC group. The IL-8 mRNA expression showed a predominant association with GC when compared to H. pylori infection,especially in males older than 40 years of age who may benefit most from this test. CONCLUSION:The future research of IL-8 mRNA expression to predict severity in the gastric cancer group should be warranted.展开更多
AIM: To investigate the effect of interleukin-8(IL-8) on neural retinal ganglion cells(RGCs) and whether it can be alleviated by G31P. METHODS: RGC-5 cells were exposed to IL-8 with or without its specific recep...AIM: To investigate the effect of interleukin-8(IL-8) on neural retinal ganglion cells(RGCs) and whether it can be alleviated by G31P. METHODS: RGC-5 cells were exposed to IL-8 with or without its specific receptor antagonist G31P for 24h, and the cell viability was assessed by Cell Counting Kit 8(CCK-8). Apoptosis was measured by examining nuclear morphology and quantifying with flow cytometry. Reverse transcription quantitative real-time polymerase chain reaction(RT-qP CR) and Western blot were used to investigate the expression of apoptosis-related genes. RESULTS: CCK-8 assay showed that IL-8 significantly inhibits the viability of RGC-5 cells in a dose-dependent manner. Cell apoptosis assays exhibited higher apoptotic rate in IL-8 treatment group compared to control group. We further found that IL-8 could promote Bax and caspase-3 expressions, but decrease the level of Bcl-2 in the aspect of m RNA and protein. However, pre-treatment with G31P partly attenuated these effects in RGC-5 cells(P〈0.05).CONCLUSION: These results indicate that anti-proliferation effects of IL-8 through induction of cell apoptosis regulated by Bcl-2, Bax and caspase-3 expressions, can be ameliorated by G31P.展开更多
Objective: To evaluate the effect of Yufeining (愈肺宁), a traditional Chinese medicine, on induced sputum interleukin-8 ilL-8) in patients with chronic obstructive pulmonary disease (COPD) at the stable phase. ...Objective: To evaluate the effect of Yufeining (愈肺宁), a traditional Chinese medicine, on induced sputum interleukin-8 ilL-8) in patients with chronic obstructive pulmonary disease (COPD) at the stable phase. Methods: Thirty-six patients with COPD were divided into trial group (18 cases) and control group (18 cases) randomly. The trial group was treated with Yufeining pills taken orally for half a year; the control group was not given any medicine. Routine lung function was recorded before and after treatment. Total cell count (TCC), differential cell counts (DCCs) and IL-8 in induced sputum were determined at the baseline and 6 months later. Results: The indices of lung function improved significantly after 6 months' treatment in trial group (P〈0.05); TCC and absolute neutrophil count decreased significantly compared with baseline in the trial group (P〈0.05) ; Sputum IL-8 concentration dropped significantly after 6 months' treatment, from a mean of 5. 216±2.914 μg/L to 4. 222±2. 140 μg/L (P〈0.05). There were insignificant changes in the parameters in the control group between baseline and 6 months later. Conclusion: Yufeining could improve lung function, decrease sputum TCC, absolute neutrophil count and IL-8 concentration, and relieve airway inflammation in patients with COPD in the stable phase.展开更多
Background Acute coronary syndrome(ACS) is one of the most common forms of heart diseases.Recent studies have revealed that interleukin(IL)-8 plays a kev role in the development of atherosclerosis plaque and its compl...Background Acute coronary syndrome(ACS) is one of the most common forms of heart diseases.Recent studies have revealed that interleukin(IL)-8 plays a kev role in the development of atherosclerosis plaque and its complications, but the relationship of its common variants with ACS has not been extensively studied.Methods We tested the hypothesis that variants in IL-8-251 A/T was associated with susceptibility to ACS and its recurrence in a Chinese case-control study comprising 675 patients with ACS and 636 control subjects and replicated the investigation in an independent study comprising 360 cases and 360 control subjects. The plasma concentration of IL-8 was measured by enzyme-linked immunosorbent assay.Results IL-8 -251A】T poly-morphism was associated with increased susceptibility to ACS (P=0.004;OR=1.30 CI:1.12-1.53).Replication in the second study yielded similar results.IL-8 -251 A/T may affect the expression of IL-8 by the evidence that augmented IL-8 production revealed in serum of the AMI patients by ELISA. Conclusions IL-8 -251 A/T polymorphism is associated with ACS risk in Chinese Han population and An allele of IL-8- 251A/T may be an independent predictive factor.展开更多
AIM:To detect the quantitative expression levels of the pro-inflammatory interleukin-8(IL8),antimicrobial peptides human beta defense-2(HBD2),and human beta defense-3(HBD3)genes in bacterial conjunctivitis.METHODS:The...AIM:To detect the quantitative expression levels of the pro-inflammatory interleukin-8(IL8),antimicrobial peptides human beta defense-2(HBD2),and human beta defense-3(HBD3)genes in bacterial conjunctivitis.METHODS:The human conjunctival epithelial cells were obtained using the impression cytology technique from healthy controls and patients.The genes expression levels were determined utilizing a reverse transcription quantitative polymerase chain reaction(RT-q PCR).The contribution of causative agent type,the number of isolates and severity of clinical features,in the increase of genes expression was also determined.RESULTS:The RT-q PCR showed that IL8,HBD2,and HBD3 expression increased in bacterial conjunctivitis as compared to healthy control(P<0.001).In gram-negative bacterial conjunctivitis,HBD2 was highly up-regulated(P<0.001)compared to other types of bacterial conjunctivitis.In mixed bacterial conjunctivitis,a direct correlation between HBD2 up-regulation and HBD3 up-regulation was observed(P<0.05).The severity of clinical features was related to the up-regulation of IL8 and HBD2(P<0.05).CONCLUSION:IL8,HBD2,and HBD3 are immuneeffectors in infectious conjunctivitis.HBD2 is active during different bacterial conjunctivitis but is more released with gram-negative bacteria compared to gram-positive bacteria.HBD3 is an obvious defender in different bacterial conjunctivitis.展开更多
In order to study the expression of interleukin-22 (IL-22) and S 100A7, A8, A9 mRNA in the skin lesions of patients with psoriasis vulgaris and their relationship, the biopsies were taken from skin lesions in 35 pat...In order to study the expression of interleukin-22 (IL-22) and S 100A7, A8, A9 mRNA in the skin lesions of patients with psoriasis vulgaris and their relationship, the biopsies were taken from skin lesions in 35 patients with psoriasis vulgaris and the skin of 16 normal controls, and the expression levels of 1L-22 and S 100A7, A8 and A9 mRNA were detected by semi-quantitative RT-PCR. The results showed that (1) IL-22 and S 100A8, A9 mRNA were positively expressed in the psoriatic skin lesions but negatively expressed in the normal controls; The expression level of S 100A7 was (1.133±0.040) in the psoriatic skin lesions, significantly higher than that in the normal controls (0.744±0.037, P〈0.01). (2) There were significantly positive correlations between the expression of IL-22/S100A7 mRNA, IL-22/S100A8 mRNA, IL-22/S100A9 mRNA in the psoriasis vulgaris (r1=-0.543, r2=0.774, r3=0.621, P〈0.01). It was concluded that IL-22 and S 100A7, A8, A9 might play important roles in the occurrence and progression of psoriasis.展开更多
AIM:To identify proangiogenic factors engaged in neovascular age-related macular degeneration(AMD)except vascular endothelial growth factor(VEGF)from human retinal pigment epithelial(h RPE)cells and investigate the un...AIM:To identify proangiogenic factors engaged in neovascular age-related macular degeneration(AMD)except vascular endothelial growth factor(VEGF)from human retinal pigment epithelial(h RPE)cells and investigate the underlying mechanisms.METHODS:VEGF receptor 2(VEGFR2)in ARPE-19 cells was depleted by si RNA transfection or overexpressed through adenovirus infection.The m RNA and the protein levels of interleukin-8(IL-8)in ARPE-19 cells were measured by quantitative real-time polymerase chain reaction and enzyme-linked immunosorbent assay respectively.The protein levels of AKT,p-AKT,MEK,p-MEK,ERK1/2,p-ERK1/2,JNK,p-JNK,p38 and p-p38 were detected by Western blotting.A selective chemical inhibitor,LY3214996,was employed to inhibit phosphorylation of ERK1/2.Cell viability was determined by MTT assay.RESULTS:Knockdown of VEGFR2 in ARPE-19 cells robustly augmented IL-8 production at both the m RNA and the protein levels.Silencing VEGFR2 substantially enhanced phosphorylation of MEK and ERK1/2 while exerted no effects on phosphorylation of AKT,JNK and p38.Inhibiting ERK1/2 phosphorylation by LY3214996 reversed changes in VEGFR2 knockdown-induced IL-8 upregulation at the m RNA and the protein levels with no effects on cell viability.VEGFR2 overexpression significantly reduced IL-8 generation at the m RNA and the protein levels.CONCLUSION:Blockade of VEGF signaling augments IL-8 secretion via MEK/ERK1/2 axis and overactivation of VEGF pathway decreases IL-8 production in h RPE cells.Upregulated IL-8 expression after VEGF signaling inhibition in h RPE cells may be responsible for being incompletely responsive to anti-VEGF remedy in neovascular AMD,and IL-8 may serve as an alternative therapeutic target for neovascular AMD.展开更多
BACKGROUND: Studies of several animal models of central nervous system diseases have shown that neural progenitor cells (NPCs) can migrate to injured tissues. Stromal cell-derived factor 1 alpha (SDF-la), and its...BACKGROUND: Studies of several animal models of central nervous system diseases have shown that neural progenitor cells (NPCs) can migrate to injured tissues. Stromal cell-derived factor 1 alpha (SDF-la), and its primary physiological receptor CXCR4, have been shown to contribute to this process. OBJECTIVE: To investigate migration efficacy of human NPCs toward a SDF-1α gradient, and the regulatory roles of tumor necrosis factor-α (TNF-α) and interleukin-8 (IL-8) in SDF-1α/CXCR4 axis-induced migration of NPCs. DESIGN, TIME AND SETTING: An in vitro, randomized, controlled, cellular and molecular biology study was performed at the Laboratory of Department of Cell Biology, Medical College of Soochow University between October 2005 and November 2007. MATERIALS: SDF-1α and mouse anti-human CXCR4 fusion antibody were purchased from R&D Systems, USA. TNF-αwas purchased from Biomyx Technology, USA and IL-8 was kindly provided by the Biotechnology Research Institute of Soochow University. METHODS: NPCs isolated from forebrain tissue of 9 to 10-week-old human fetuses were cultured in vitro. The cells were incubated with 0, 20, and 40 ng/mL TNF-α, or 0, 20, and 40 ng/mL IL-8, for 48 hours prior to migration assay. For antibody-blocking experiments, cells were further pretreated with 0, 20, and 40 μg/mL mouse anti-human CXCR4 fusion antibody for 2 hours. Subsequently, the transwell assay and CXCR4 blockade experiments were performed to evaluate migration of human NPCs toward a SDF-1α gradient. Serum-free culture medium without SDF-1α served as the negative control. MAIN OUTCOME MEASURES: The transwell assay was performed to evaluate migration of human NPCs toward a SDF-1α gradient, which was blocked by fusion antibody against CXCR4. In addition, CXCR4 expression in human NPCs stimulated by TNF-α and IL-8 was measured by flow cytometry. RESULTS: Results from the transwell assay demonstrated that SDF-1α was a strong chemoattractant for human NPCs (P 〈 0.01), and 20 ng/mL produced the highest levels of migration. Anti-human CXCR4 fusion antibody significantly blocked the chemotactic effect (P 〈 0.05). Flow cytometry results showed that treatment with TNF-α and IL-8 resulted in increased CXCR4 expression and greater chemotaxis efficiency of NPCs towards SDF-1α(P 〈 0.01). CONCLUSION: These results demonstrated that SDF-la significantly attracted NPCs in vitro, and neutralizing anti-CXCR4 antibody could block part of this chemotactic function. TNF-α and IL-8 increased chemotaxis efficiency of NPCs towards the SDF-1αgradient by upregulating CXCR4 expression in NPCs.展开更多
Objective: Interleukin-8(IL-8) represents the prototypical chemokine that is made by a wide variety of cell types. Previously studies have suggested that angiotensin Ⅱ(Ang Ⅱ) is involved in atherogenesis throug...Objective: Interleukin-8(IL-8) represents the prototypical chemokine that is made by a wide variety of cell types. Previously studies have suggested that angiotensin Ⅱ(Ang Ⅱ) is involved in atherogenesis through induction ofproinflammatory cytokines such as interleukin- 6 or monocyte chemoattractant protein-1(MCP-1) in vascular smooth muscle cells(VSMCs), while the role of Ang II on IL-8 expression in VSMCs is poorly studied. Methods: In this study, VSMCs were isolated from the thoracic aorta of Sprague-Dawley rats. The expression of smooth muscle α-actin was confirmed by an immunohistochemical method. Semi-quantitative RT-PCR and enzyme-linked immunosorbent assay (ELISA) analyses were conducted to detect IL-8 expression. Results: In the present study we found that Ang Ⅱ significantly increased the expression of IL-8 both at the mRNA and protein levels in rat VSMCs in a dose- and time-dependent manner. Conclusion: These findings suggested that Ang Ⅱ may participate in atherosclerosis through induction of inflammatory mediator in VSMCs.展开更多
The development and maintenance of an abundant blood supply is essential for the healing of wound and neoplastic tissues.Angiogenesis,the development of new vessels from adjacent capillary networks,plays an important ...The development and maintenance of an abundant blood supply is essential for the healing of wound and neoplastic tissues.Angiogenesis,the development of new vessels from adjacent capillary networks,plays an important role in physiologic and as well as in展开更多
Train drivers are engaged in high-stress job. It may induce sleep, fatigue, and alertness loss at work, and endanger public safety. It’s unclear that cytokines of train driver would be influenced by their job. The re...Train drivers are engaged in high-stress job. It may induce sleep, fatigue, and alertness loss at work, and endanger public safety. It’s unclear that cytokines of train driver would be influenced by their job. The research considers the hypothesis that stressful professions, such as train driver, influence the body’s immune system through the long-time and high-pressure working, and change production of neuro-immune factors. Using enzyme linked immunosorbent assay (ELISA), several neuro-immune factors were assayed among train drivers (N = 82) and health blood donors (N = 80) enrolled in the Yunnan Collaborative Innovation Center for Public Health and Disease Control. The concentrations of angiotensin, C-reactive protein (CRP), interleukin-8 (IL-8), and tumor necrosis factor-alpha (TNF-α) were determined. Kruskal-Wallis test and Dunn’s multiple comparisons test were performed for overall comparison between groups and for pairwise comparison, respectively. Statistical significance level was set at P < 0.05. The profession of train driving was not associated with significant increases or decreases in the systemic levels of inflammatory (CRP, IL-8, and TNF-α), but it was associated with the high expression of angiotensin in vivo. These findings suggest that the job of train driving may not be associated with significant alterations in systemic immune condition, but arouse the level of angiotensin.展开更多
Acute kidney injury (AKI) is common in hospitalized patients and is strongly correlated with increased morbidity, mortality, and prolonged hospitalization. However, signals that determine whether injured tissues follo...Acute kidney injury (AKI) is common in hospitalized patients and is strongly correlated with increased morbidity, mortality, and prolonged hospitalization. However, signals that determine whether injured tissues following AKI will repair or fibrose and lead to chronic kidney disease (CKD) are not well defined. Numerous cytokines are activated at various times after injury and recruit inflammatory cells. Interleukin-8 (IL-8) is upregulated following activation of Gα12 by H2O2, a reactive oxygen species (ROS). Herein, we study this occurrence in vitro and in vivo. IL-8 was measured by ELISA in Gα12-silenced (si-Gα12) and inducible QLα12 (constitutively active Gα12) Madin-Darby Canine Kidney (QLα12-MDCK) cell lines after H2O2/catalase cell injury. QLα12- and si-Gα12 MDCK cells showed time-, agonist- and Gα12-dependent increases in IL-8 mRNA and protein. Gα12-silenced MDCK cells demonstrated lower IL-8 expression and blunted IL-8 increases. In transgenic mice (QLα12γGTCre+, proximal tubule Qα12 expression) ischemia reperfusion injury led to significant upregulation of CXCL-1 (IL-8 homologue) at 48 hours that was not observed in Gα12 knockout mice. Macrophages in renal cells from these mice were imaged by immunofluorescent microscopy and QLα12γGTCre+ showed increased macrophage infiltration. We demonstrate that IL-8 is a critical link between H2O2 stimulated Gα12 and renal injury. Gα12 activation led to increased IL-8 expression, a potent mediator of inflammation after injury. Future studies targeting Gα12 for inhibition after injury may blunt the IL-8 response and allow for organ recovery.展开更多
文摘BACKGROUND: Pulmonary complications after orthoto- pic liver transplantation (OLT) include high morbidity and mortality. Experimental data have suggested hepatic ische- mia and reperfusion are induced by pro-inflammatory cyto- kines. The high level of inflammatory cytokines might ad- ditionally influence pulmonary cappillary fluid filtration. The objectives of this study were to measure the concentra- tions of tumor necrotic factor-alpha (TNF-α), interleukin- 6 (IL-6) and interleukin-8 (IL-8) during OLT and to in- vestigate the relationship between these cytokines and post- operative pulmonary complications. METHODS: Twenty-two patients undergoing OLT were divided into two groups according to whether they had postoperative pulmonary complications: group A consis- ting of 8 patients with postoperative pulmonary complica- tions , and group B consisting of 14 patients without post- operative pulmonary complications. Enzyme-linked im- munoassay (ELISA) was used to determine serum TNF-α, IL-6 and IL-8. Blood samples were taken at the beginning of operation (T0 ), clamping and cross-clamping of the in- ferior cava and portal vein (T1, T2 ), 90 minutes and 3 hours after reperfusion (T3 , T4 ) and 24 hours after opera- tion (T5). RESULTS: The level of PaO2/FiO2 in group A was lower than that in group B ( P <0. 05 ). The concentrations of TNF-α, IL-6 and IL-8 in the two groups increased rapidly at T2 , peaked at T3 , decreased rapidly after T3 until 24 hours after operation. The concentrations of TNF-α, IL-6 and IL-8 in group A were higher than those in group B at T2, T3, and T4(P<0.05). CONCLUSION: After un-clamping of the inferior cava and portal vein, the serum concentrations of TNF-α, IL-6 and IL-8 increased may be related to pulmonary injury after he- patic ischemic reperfusion.
基金Supported by A research grant,No.0720570,from the National Cancer Center,by the National Research Foundation of Korea(NRF)grant,Basic Research Program,No.2010-0009910MRCfor Gene Regulation,No.2011-0030132 funded by the Korea government(MSIP)
文摘Helicobacter pylori(H.pylori)is a major etiological factor in the development of gastric cancer.Large-scale epidemiological studies have confirmed the strong association between H.pylori infection and both cancer development and progression.Interleukin-8(IL-8)is overexpressed in gastric mucosa exposed to H.pylori.The expression of IL-8 directly correlates with a poor prognosis in gastric cancer.IL-8 is multifunctional.In addition to its potent chemotactic activity,it can induce proliferation and migration of cancer cells.In this review,we focus on recent insights into the mechanisms of IL-8 signaling associated with gastric cancer.The relationship between IL-8 and H.pylori is discussed.We also summarize the current therapeutics against IL-8 in gastric cancer.
基金Supported by grant from the three-year action plan fund of Traditional Chinese Medicine,Shanghai City Health Administration,China,No.ZYSNXD-CC-ZDYJ024
文摘AIM:To investigate the interaction between Xiaotan Sanjie(XTSJ) decoction and interleukin-8(IL-8) and its effect on adhesion,migration and invasion of SGC-7901 gastric cancer cells.METHODS:SGC-7901 gastric cancer cells were exposed to serum containing XTSJ decoction and/orIL-8(1 ng/m L).SGC-7901 cell adhesion to fibronectin,an extracellular matrix component,was detected using the Cell Counting Kit-8.Migration and invasion abilities of SGC-7901 cells were detected by scratch wound and Transwell chamber assays.Then,protein(immunofluorescence and Western blot) and m RNA levels(quantitative polymerase chain reaction) of cluster of differentiation 44(CD44),a cell adhesion molecule,were measured in 72-h-cultured SGC-7901 cells.RESULTS:Cell adhesion was promoted by IL-8(P = 0.001),but was inhibited by XTSJ decoction(P = 0.0001).Similarly,IL-8 promoted SGC-7901 cell invasion(P = 0.003),and XTSJ decoction inhibited cell invasion(P = 0.001).IL-8 induced SGC-7901 cell migration,but this was inhibited by XTSJ decoction.IL-8 up-regulated CD44 protein(P = 0.028) and m RNA expression(P = 0.002),whereas XTSJ decoction inhibited CD44 protein expression(P = 0.0001),but not m RNA expression(P = 0.275).An interaction between XTSJ decoction and IL-8 was confirmed in the invasion(P = 0.001) and CD44 m RNA expression of SGC-7901 cells(P = 0.010),but not in cell adhesion(P = 0.051).CONCLUSION:XTSJ decoction may inhibit adhesion,migration and invasion of gastric cancer cells,which is partly associated with down-regulation of IL-8.
文摘BACKGROUND: Interleukin-18 (IL-18), a pro-inflamma- tory cytokine that induces interferon-γ (IFN-γ) production in T cells and natural killer cells, plays a critical role in the T-lymphocyte helper type 1 ( Th1) response. This study was designed to explore the effect of IL-18 on peripheral blood mononuclear cells ( PBMCs) derived from chronic hepatitis B (CHB) and on hepatitis B virus (HBV) DNA released by HepG2.2.15 cell lines, which were transfected with hepatitis B virus gene in vitro. METHODS: PBMCs isolated from 25 healthy people and 25 patients with CHB were stimulated with HBcAg and IL-18 of various concentrations for 72 hours. The levels of IFN-γ in the supernatants of cultured PBMCs were determined by ELISA. After the stimulation of IL-18 of various concentra- tions, PBMCs derived from one patient were co-cultured for 96 hours with HepG2. 2. 15 cells which had been cul- tured for 24 hours, and then the supernatants were collected by centrifugation and used for HBV DNA quantitative as- say. RESULTS: When PBMCs were stimulated by HBcAg and IL-18 at various concentrations, the levels of IFN-γ in the supernatants of CHB groups were much higher than those in normal control groups, at 0.2 ng/ml: t =11.70, P< 0.01; at 1.0 ng/ml: t =16.19, P<0.01; and at5.0 ng/ml: t =20.12, P <0.01. In the CHB groups, the levels of IFN-γ in the supernatants of PBMCs stimulated by HBcAg alone were lower than both those stimulated by HBcAg and EL-18 at various concentrations and those stimulated by HBcAg and EL-18 (5.0 ng/ml) together with EL-12 (mild: t = 2.20, P<0.05; moderate; t=2.97, P<0.05; severe; t = 0.66, P >0.05). The content of HBV DNA in the superna- tant of co-cultivation of HepG2. 2. 15 cells and PBMCs without stimulated materials was higher than that stimula-ted by HBcAg and EL-18 at various concentrations of HBc- Ag and IL-18 together with IL-12/IFN-α1lb. CONCLUSION: DL-18 can induce IFN-γ secretion and pro- bably play a key role in the modulation of both innate and adaptive immunity. It has implications in improving im- munoregulatory effect and increasing the ability of immune cells to kill cells infected by virus.
文摘AIM:To assess the diagnostic value of serum interleukin-8(IL-8)in the detection of colorectal cancer(CRC).METHODS:An original study was conducted to explore the potential value of IL-8 in CRC diagnosis.Receiver operating characteristic(ROC)analysis was performed and the area under the curve(AUC)value was calculated.PUBMED and EMBASE were searched(to October,2013),supplemented with manual screening for relevant publications.Meta-analysis methods were applied to pool sensitivity,specificity,positive and negative likelihood ratios,and diagnostic odds ratios and to construct a summary receiver-operating characteristic(s ROC)curve.Heterogeneity across studies was checked by the I2 test and Deek’s funnel plot method was applied to test publication bias.RESULTS:In our original study,serum IL-8 yielded an AUC of 0.742[95%CI:0.635-0.849].The sensitivity and specificity were 85.42%and 54.05%,respectively,at a cut-off value of 5.39.In this meta-analysis,we included five studies with 668 CRC patients and 374controls and one study in our own center with 48 CRC patients and 37 controls.The pooled sensitivity and specificity of IL-8 were 0.69(95%CI:0.42-0.87)and0.85(95%CI:0.68-0.94)for CRC detection.Besides,the area under the s ROC curve was 0.86(95%CI:0.82-0.88).Subgroup analysis suggested that there was no heterogeneity in the Asian subgroup but some in the European subgroup.In addition,no publication bias was found according to the Deek’s funnel plot asymmetry test.CONCLUSION:Serum IL-8 is a promising biomarker for CRC detection and may become a clinically useful tool to identify high-risk patients.
基金sponsored in part by Science and Technology Commission of Shanghai Municipality, China (No. 07ZR14018)
文摘Pigment epithelium-derived factor (PEDF) is an antiangiogenic factor which is effective in tumour inhibition in a variety of tumours and has not yet been studied in bladder tumour before. In this study the expression of PEDF, interleukin-1α (IL-1α) and -8 (IL-8) in bladder tumours was investigated. Immunohistochemistry was performed on 64 bladder tumour and 23 normal uroepithelium samples. Expression change of the factors was compared with clinicopathological parameters. Correlations between PEDF, IL-1α and IL-8 were analyzed. None of the factors was in relation to gender, tumour occurrence, and size or onset pattern. PEDF (P=0.014) and IL-1α (P=0.049) expression was down-regulated with grade progression. PEDF expression was lower in normal uroepithelium than in papillary urothelial neoplasm of low malignant potential (PUNLMP) (P=0.000) and carcinoma (P=0.009) whilst IL-1α (P=0.000 and P=0.000 respectively) and IL-8 (P=0.000 and P=0.023 respectively) expression was higher in the same grouping. PEDF expression had a negative correlation with IL-8 in PUNLMP (P=0.049, r=-0.578) as well as in tumour grouping (P=0.033, r=-0.276). Deranged expressional change of PEDF, IL-1α and IL-8 could be in relation to loss of differentiation from normal uroepithelium to papillary lesion and eventually to carcinoma.
文摘AIM:To evaluate(1) the association of the Helicobacter pylori(H.pylori) test and interleukin-8(IL-8) m RNA expression alone and the severity of gastric cancer(GC);(2) the association of both tests were added to patients' characteristics to identifli Thai suspected patients of gastric cancer who would receive the most benefit; and(3) diagnostic value of levels of IL-8 m RNA expression for gastric cancer.METHODS: A cross-sectional analytical study was completed with 220 patients with 86 GC patients who underwent endoscopy with gastric surgery divided into non-metastasis and metastasis groups,and 134 patients with benign lesions who underwent endoscopic examination,at the Gastrointestinal Surgery and Endoscopy Unit,Chiang Mai University Hospital between 2006 and 2010. Of 220 patients,86 cases of diagnosed gastric adenocarcinoma were in an advanced stage and 134 cases were non-cancer patients. RESULTS: The IL-8 m RNA expression showed predominant association with advanced GC when compared to H. pylori infection alone [OR(95%CI); 0.86(0.49-1.53) vs 5.44(3.08-9.62)] when including the patients' characteristics the highest of the area under the receiver operating characteristic curves(Au ROC) of the model were males older than 40 years of age [AuROC(95%CI); 0.81(0.75-0.86)]. However,preliminary testing for diagnostic indices of four cut-off points of IL-8 m RNA expression to predict the severity of GC cases found an increasing suboptimal trend from the likelihood ratio of positive to differentiate the severity in the GC group. The IL-8 mRNA expression showed a predominant association with GC when compared to H. pylori infection,especially in males older than 40 years of age who may benefit most from this test. CONCLUSION:The future research of IL-8 mRNA expression to predict severity in the gastric cancer group should be warranted.
文摘AIM: To investigate the effect of interleukin-8(IL-8) on neural retinal ganglion cells(RGCs) and whether it can be alleviated by G31P. METHODS: RGC-5 cells were exposed to IL-8 with or without its specific receptor antagonist G31P for 24h, and the cell viability was assessed by Cell Counting Kit 8(CCK-8). Apoptosis was measured by examining nuclear morphology and quantifying with flow cytometry. Reverse transcription quantitative real-time polymerase chain reaction(RT-qP CR) and Western blot were used to investigate the expression of apoptosis-related genes. RESULTS: CCK-8 assay showed that IL-8 significantly inhibits the viability of RGC-5 cells in a dose-dependent manner. Cell apoptosis assays exhibited higher apoptotic rate in IL-8 treatment group compared to control group. We further found that IL-8 could promote Bax and caspase-3 expressions, but decrease the level of Bcl-2 in the aspect of m RNA and protein. However, pre-treatment with G31P partly attenuated these effects in RGC-5 cells(P〈0.05).CONCLUSION: These results indicate that anti-proliferation effects of IL-8 through induction of cell apoptosis regulated by Bcl-2, Bax and caspase-3 expressions, can be ameliorated by G31P.
文摘Objective: To evaluate the effect of Yufeining (愈肺宁), a traditional Chinese medicine, on induced sputum interleukin-8 ilL-8) in patients with chronic obstructive pulmonary disease (COPD) at the stable phase. Methods: Thirty-six patients with COPD were divided into trial group (18 cases) and control group (18 cases) randomly. The trial group was treated with Yufeining pills taken orally for half a year; the control group was not given any medicine. Routine lung function was recorded before and after treatment. Total cell count (TCC), differential cell counts (DCCs) and IL-8 in induced sputum were determined at the baseline and 6 months later. Results: The indices of lung function improved significantly after 6 months' treatment in trial group (P〈0.05); TCC and absolute neutrophil count decreased significantly compared with baseline in the trial group (P〈0.05) ; Sputum IL-8 concentration dropped significantly after 6 months' treatment, from a mean of 5. 216±2.914 μg/L to 4. 222±2. 140 μg/L (P〈0.05). There were insignificant changes in the parameters in the control group between baseline and 6 months later. Conclusion: Yufeining could improve lung function, decrease sputum TCC, absolute neutrophil count and IL-8 concentration, and relieve airway inflammation in patients with COPD in the stable phase.
文摘Background Acute coronary syndrome(ACS) is one of the most common forms of heart diseases.Recent studies have revealed that interleukin(IL)-8 plays a kev role in the development of atherosclerosis plaque and its complications, but the relationship of its common variants with ACS has not been extensively studied.Methods We tested the hypothesis that variants in IL-8-251 A/T was associated with susceptibility to ACS and its recurrence in a Chinese case-control study comprising 675 patients with ACS and 636 control subjects and replicated the investigation in an independent study comprising 360 cases and 360 control subjects. The plasma concentration of IL-8 was measured by enzyme-linked immunosorbent assay.Results IL-8 -251A】T poly-morphism was associated with increased susceptibility to ACS (P=0.004;OR=1.30 CI:1.12-1.53).Replication in the second study yielded similar results.IL-8 -251 A/T may affect the expression of IL-8 by the evidence that augmented IL-8 production revealed in serum of the AMI patients by ELISA. Conclusions IL-8 -251 A/T polymorphism is associated with ACS risk in Chinese Han population and An allele of IL-8- 251A/T may be an independent predictive factor.
文摘AIM:To detect the quantitative expression levels of the pro-inflammatory interleukin-8(IL8),antimicrobial peptides human beta defense-2(HBD2),and human beta defense-3(HBD3)genes in bacterial conjunctivitis.METHODS:The human conjunctival epithelial cells were obtained using the impression cytology technique from healthy controls and patients.The genes expression levels were determined utilizing a reverse transcription quantitative polymerase chain reaction(RT-q PCR).The contribution of causative agent type,the number of isolates and severity of clinical features,in the increase of genes expression was also determined.RESULTS:The RT-q PCR showed that IL8,HBD2,and HBD3 expression increased in bacterial conjunctivitis as compared to healthy control(P<0.001).In gram-negative bacterial conjunctivitis,HBD2 was highly up-regulated(P<0.001)compared to other types of bacterial conjunctivitis.In mixed bacterial conjunctivitis,a direct correlation between HBD2 up-regulation and HBD3 up-regulation was observed(P<0.05).The severity of clinical features was related to the up-regulation of IL8 and HBD2(P<0.05).CONCLUSION:IL8,HBD2,and HBD3 are immuneeffectors in infectious conjunctivitis.HBD2 is active during different bacterial conjunctivitis but is more released with gram-negative bacteria compared to gram-positive bacteria.HBD3 is an obvious defender in different bacterial conjunctivitis.
文摘In order to study the expression of interleukin-22 (IL-22) and S 100A7, A8, A9 mRNA in the skin lesions of patients with psoriasis vulgaris and their relationship, the biopsies were taken from skin lesions in 35 patients with psoriasis vulgaris and the skin of 16 normal controls, and the expression levels of 1L-22 and S 100A7, A8 and A9 mRNA were detected by semi-quantitative RT-PCR. The results showed that (1) IL-22 and S 100A8, A9 mRNA were positively expressed in the psoriatic skin lesions but negatively expressed in the normal controls; The expression level of S 100A7 was (1.133±0.040) in the psoriatic skin lesions, significantly higher than that in the normal controls (0.744±0.037, P〈0.01). (2) There were significantly positive correlations between the expression of IL-22/S100A7 mRNA, IL-22/S100A8 mRNA, IL-22/S100A9 mRNA in the psoriasis vulgaris (r1=-0.543, r2=0.774, r3=0.621, P〈0.01). It was concluded that IL-22 and S 100A7, A8, A9 might play important roles in the occurrence and progression of psoriasis.
基金Supported by the National Natural Science Foundation of China(No.81200670)。
文摘AIM:To identify proangiogenic factors engaged in neovascular age-related macular degeneration(AMD)except vascular endothelial growth factor(VEGF)from human retinal pigment epithelial(h RPE)cells and investigate the underlying mechanisms.METHODS:VEGF receptor 2(VEGFR2)in ARPE-19 cells was depleted by si RNA transfection or overexpressed through adenovirus infection.The m RNA and the protein levels of interleukin-8(IL-8)in ARPE-19 cells were measured by quantitative real-time polymerase chain reaction and enzyme-linked immunosorbent assay respectively.The protein levels of AKT,p-AKT,MEK,p-MEK,ERK1/2,p-ERK1/2,JNK,p-JNK,p38 and p-p38 were detected by Western blotting.A selective chemical inhibitor,LY3214996,was employed to inhibit phosphorylation of ERK1/2.Cell viability was determined by MTT assay.RESULTS:Knockdown of VEGFR2 in ARPE-19 cells robustly augmented IL-8 production at both the m RNA and the protein levels.Silencing VEGFR2 substantially enhanced phosphorylation of MEK and ERK1/2 while exerted no effects on phosphorylation of AKT,JNK and p38.Inhibiting ERK1/2 phosphorylation by LY3214996 reversed changes in VEGFR2 knockdown-induced IL-8 upregulation at the m RNA and the protein levels with no effects on cell viability.VEGFR2 overexpression significantly reduced IL-8 generation at the m RNA and the protein levels.CONCLUSION:Blockade of VEGF signaling augments IL-8 secretion via MEK/ERK1/2 axis and overactivation of VEGF pathway decreases IL-8 production in h RPE cells.Upregulated IL-8 expression after VEGF signaling inhibition in h RPE cells may be responsible for being incompletely responsive to anti-VEGF remedy in neovascular AMD,and IL-8 may serve as an alternative therapeutic target for neovascular AMD.
基金the National Natural Science Foundation of China,No.30671041the National Basic Research Program of China(973 Program),No. 2005CB623902
文摘BACKGROUND: Studies of several animal models of central nervous system diseases have shown that neural progenitor cells (NPCs) can migrate to injured tissues. Stromal cell-derived factor 1 alpha (SDF-la), and its primary physiological receptor CXCR4, have been shown to contribute to this process. OBJECTIVE: To investigate migration efficacy of human NPCs toward a SDF-1α gradient, and the regulatory roles of tumor necrosis factor-α (TNF-α) and interleukin-8 (IL-8) in SDF-1α/CXCR4 axis-induced migration of NPCs. DESIGN, TIME AND SETTING: An in vitro, randomized, controlled, cellular and molecular biology study was performed at the Laboratory of Department of Cell Biology, Medical College of Soochow University between October 2005 and November 2007. MATERIALS: SDF-1α and mouse anti-human CXCR4 fusion antibody were purchased from R&D Systems, USA. TNF-αwas purchased from Biomyx Technology, USA and IL-8 was kindly provided by the Biotechnology Research Institute of Soochow University. METHODS: NPCs isolated from forebrain tissue of 9 to 10-week-old human fetuses were cultured in vitro. The cells were incubated with 0, 20, and 40 ng/mL TNF-α, or 0, 20, and 40 ng/mL IL-8, for 48 hours prior to migration assay. For antibody-blocking experiments, cells were further pretreated with 0, 20, and 40 μg/mL mouse anti-human CXCR4 fusion antibody for 2 hours. Subsequently, the transwell assay and CXCR4 blockade experiments were performed to evaluate migration of human NPCs toward a SDF-1α gradient. Serum-free culture medium without SDF-1α served as the negative control. MAIN OUTCOME MEASURES: The transwell assay was performed to evaluate migration of human NPCs toward a SDF-1α gradient, which was blocked by fusion antibody against CXCR4. In addition, CXCR4 expression in human NPCs stimulated by TNF-α and IL-8 was measured by flow cytometry. RESULTS: Results from the transwell assay demonstrated that SDF-1α was a strong chemoattractant for human NPCs (P 〈 0.01), and 20 ng/mL produced the highest levels of migration. Anti-human CXCR4 fusion antibody significantly blocked the chemotactic effect (P 〈 0.05). Flow cytometry results showed that treatment with TNF-α and IL-8 resulted in increased CXCR4 expression and greater chemotaxis efficiency of NPCs towards SDF-1α(P 〈 0.01). CONCLUSION: These results demonstrated that SDF-la significantly attracted NPCs in vitro, and neutralizing anti-CXCR4 antibody could block part of this chemotactic function. TNF-α and IL-8 increased chemotaxis efficiency of NPCs towards the SDF-1αgradient by upregulating CXCR4 expression in NPCs.
基金supported by the Shanghai Science and Technology Committee Grant (No.03DJ14019)
文摘Objective: Interleukin-8(IL-8) represents the prototypical chemokine that is made by a wide variety of cell types. Previously studies have suggested that angiotensin Ⅱ(Ang Ⅱ) is involved in atherogenesis through induction ofproinflammatory cytokines such as interleukin- 6 or monocyte chemoattractant protein-1(MCP-1) in vascular smooth muscle cells(VSMCs), while the role of Ang II on IL-8 expression in VSMCs is poorly studied. Methods: In this study, VSMCs were isolated from the thoracic aorta of Sprague-Dawley rats. The expression of smooth muscle α-actin was confirmed by an immunohistochemical method. Semi-quantitative RT-PCR and enzyme-linked immunosorbent assay (ELISA) analyses were conducted to detect IL-8 expression. Results: In the present study we found that Ang Ⅱ significantly increased the expression of IL-8 both at the mRNA and protein levels in rat VSMCs in a dose- and time-dependent manner. Conclusion: These findings suggested that Ang Ⅱ may participate in atherosclerosis through induction of inflammatory mediator in VSMCs.
基金supported by grant from National Natural Science Foundation of China No10772127,30570450Program for New Century Excellent Talents in University NCET-06-0789Sichaun Youth Science and Technology Foundation 06ZQ026-009
文摘The development and maintenance of an abundant blood supply is essential for the healing of wound and neoplastic tissues.Angiogenesis,the development of new vessels from adjacent capillary networks,plays an important role in physiologic and as well as in
文摘Train drivers are engaged in high-stress job. It may induce sleep, fatigue, and alertness loss at work, and endanger public safety. It’s unclear that cytokines of train driver would be influenced by their job. The research considers the hypothesis that stressful professions, such as train driver, influence the body’s immune system through the long-time and high-pressure working, and change production of neuro-immune factors. Using enzyme linked immunosorbent assay (ELISA), several neuro-immune factors were assayed among train drivers (N = 82) and health blood donors (N = 80) enrolled in the Yunnan Collaborative Innovation Center for Public Health and Disease Control. The concentrations of angiotensin, C-reactive protein (CRP), interleukin-8 (IL-8), and tumor necrosis factor-alpha (TNF-α) were determined. Kruskal-Wallis test and Dunn’s multiple comparisons test were performed for overall comparison between groups and for pairwise comparison, respectively. Statistical significance level was set at P < 0.05. The profession of train driving was not associated with significant increases or decreases in the systemic levels of inflammatory (CRP, IL-8, and TNF-α), but it was associated with the high expression of angiotensin in vivo. These findings suggest that the job of train driving may not be associated with significant alterations in systemic immune condition, but arouse the level of angiotensin.
文摘Acute kidney injury (AKI) is common in hospitalized patients and is strongly correlated with increased morbidity, mortality, and prolonged hospitalization. However, signals that determine whether injured tissues following AKI will repair or fibrose and lead to chronic kidney disease (CKD) are not well defined. Numerous cytokines are activated at various times after injury and recruit inflammatory cells. Interleukin-8 (IL-8) is upregulated following activation of Gα12 by H2O2, a reactive oxygen species (ROS). Herein, we study this occurrence in vitro and in vivo. IL-8 was measured by ELISA in Gα12-silenced (si-Gα12) and inducible QLα12 (constitutively active Gα12) Madin-Darby Canine Kidney (QLα12-MDCK) cell lines after H2O2/catalase cell injury. QLα12- and si-Gα12 MDCK cells showed time-, agonist- and Gα12-dependent increases in IL-8 mRNA and protein. Gα12-silenced MDCK cells demonstrated lower IL-8 expression and blunted IL-8 increases. In transgenic mice (QLα12γGTCre+, proximal tubule Qα12 expression) ischemia reperfusion injury led to significant upregulation of CXCL-1 (IL-8 homologue) at 48 hours that was not observed in Gα12 knockout mice. Macrophages in renal cells from these mice were imaged by immunofluorescent microscopy and QLα12γGTCre+ showed increased macrophage infiltration. We demonstrate that IL-8 is a critical link between H2O2 stimulated Gα12 and renal injury. Gα12 activation led to increased IL-8 expression, a potent mediator of inflammation after injury. Future studies targeting Gα12 for inhibition after injury may blunt the IL-8 response and allow for organ recovery.