Hypoxia-inducible factor 1alpha and vascular endothelial growth factor in Glioblastoma Multiforme:a systematic review going beyond pathologic implications

Glioblastoma multiforme(GBM)is an aggressive primary brain tumor characterized by extensive heterogeneity and vascular proliferation.Hypoxic conditions in the tissue microenvironment are considered a pivotal player leading tumor progression.Specifically,hypoxia is known to activate inducible factors,such as hypoxia-inducible factor 1alpha(HIF-1α),which in turn can stimulate tumor neo-angiogenesis through activation of various downward mediators,such as the vascular endothelial growth factor(VEGF).Here,we aimed to explore the role of HIF-1α/VEGF immunophenotypes alone and in combination with other prognostic markers or clinical and image analysis data,as potential biomarkers of GBM prognosis and treatment efficacy.We performed a systematic review(Medline/Embase,and Pubmed database search was completed by 16th of April 2024 by two independent teams;PRISMA 2020).We evaluated methods of immunoassays,cell viability,or animal or patient survival methods of the retrieved studies to assess unbiased data.We used inclusion criteria,such as the evaluation of GBM prognosis based on HIF-1α/VEGF expression,other biomarkers or clinical and imaging manifestations in GBM related to HIF-1α/VEGF expression,application of immunoassays for protein expression,and evaluation of the effectiveness of GBM therapeutic strategies based on HIF-1α/VEGF expression.We used exclusion criteria,such as data not reporting both HIF-1αand VEGF or prognosis.We included 50 studies investigating in total 1319 GBM human specimens,18 different cell lines or GBM-derived stem cells,and 6 different animal models,to identify the association of HIF-1α/VEGF immunophenotypes,and with other prognostic factors,clinical and macroscopic data in GBM prognosis and therapeutic approaches.We found that increased HIF-1α/VEGF expression in GBM correlates with oncogenic factors,such as miR-210-3p,Oct4,AKT,COX-2,PDGF-C,PLDO3,M2 polarization,or ALK,leading to unfavorable survival.Reduced HIF-1α/VEGF expression correlates with FIH-1,ADNP,or STAT1 upregulation,as well as with clinical manifestations,like epileptogenicity,and a favorable prognosis of GBM.Based on our data,HIF-1αor VEGF immunophenotypes may be a useful tool to clarify MRI-PET imaging data distinguishing between GBM tumor progression and pseudoprogression.Finally,HIF-1α/VEGF immunophenotypes can reflect GBM treatment efficacy,including combined first-line treatment with histone deacetylase inhibitors,thimerosal,or an active metabolite of irinotecan,as well as STAT3 inhibitors alone,and resulting in a favorable tumor prognosis and patient survival.These data were supported by a combination of variable methods used to evaluate HIF-1α/VEGF immunophenotypes.Data limitations may include the use of less sensitive detection methods in some cases.Overall,our data support HIF-1α/VEGF’s role as biomarkers of GBM prognosis and treatment efficacy.

The effect of AD-VEGF-siRNA on the expression of vascular endothelial growth factor in osteosarcoma-bearing nude mice

Objective： To explore the influence of AD-VEGF-siRNA on the expression of vascular endothelial growth factor （VEGF） in neoplasm and blood serum. Methods： Transplantable model of human osteosarcoma was successfully established by the way of subcutaneous injection of VEGF highly expressed human MG63 osteosarcoma cells. These mice were divided randomly into three groups： AD-VEGF-siRNA group, 15 mice; AD-EGFP group, 15 mice; PBS group, 15 mice. Three mice were additionally raised without any treatment. The drug was injected intratumorally 200 μL at each time, once a day. The total dose of virus was 2 × 10^9 pfu. Three osteosarcema-bearing mice of each group were sacrificed at 11th, 14th ,17th day after the implantation of MG63 cells. The expression of VEGF in implanted tumors and blood serum was detected by ELISA methods. Then the left mice were all sacrificed at the end of experiment （19th day）. The expression of VEGF in implanted tumors was detected by RT-PCR and immune histochemistry methods, and that in implanted tumors and blood serum was detected by ELISA methods. Results： （1） Tumors in mice could be seen at 5th day from the implantation of MG63 cells. （2） The expression of VEGF could be detected in all groups by RT-PCR and immune histochemistry, Which was much lower in the group receiving AD-VEGF-siRNA therapy than two control groups （P 〈 0.05）. （3） The expression of VEGF in blood serum of osteosarcoma-bearing mice was much higher than that of three healthy mice by ELISA （P 〈 0.05）. （4） The expression of VEGF in blood serum and neoplasm in AD-VEGF-siRNA group was much lower than that in two control groups （P 〈 0.05）. Conclusion： AD-VEGF-siRNA could effectively inhibited VEGF expression in vivo. This technology would bring some good references for our therapy of antiangiogenesis in osteosarcoma.

IMPACTS ON THE EXPRESSION OF VASCULAR ENDOTHELIAL GROWTH FACTOR IN ISCHEMIC BRAIN TISSUE TREATED WITH CLUSTER PUNC-TURE ON SCALP ACUPOINTS IN RATS

Objective To probe into the impacts on the expression of vascular endothelial growth factor （VEGF） in ischemic brain tissue treated with cluster puncture on scalp acupoints in rats, Methods 128 rats were randomized into pseudo-operation group, model group, scalp-needling group and cluster-needling group, In scalp-needling group, penetration method was used on the focal side from Bǎihuì （百会 GV20） to Qǔbīn （曲鬓 GB7）, and in cluster-needling group, penetration method was used on both sides from GV20 to GB7, and a common needling on GV 20. Needles were punctured 2 mm in depth, constantly rotated for 10min, retained for 2 h. Immunohistrochemical method was applied to determine VEGF expression and microvessel density （MVD）. Results With the intervention of cluster puncture on scalp acupoints, VEGF： expressions on every time-spot after ischemia were enhanced apparently, superior to those in scalp-needling group. On the three time-spots of the 7^th, 14^th and 21^st days, MVD was increased after cluster puncture on scale acupoints, superior to those in scalp-needling group. Conclusion Cluster puncture on scalp acupoints up-regulated VEGF expression and promoted regeneration of microvessel.

益气化瘀汤联合羟苯磺酸钙治疗糖尿病肾病气虚血瘀证的疗效及对VEGF,IGF-1表达水平的影响研究

【目的】观察益气化瘀汤(由黄芪、山药、茯苓、炒芡实、旱莲草、金樱子、焦山楂、女贞子、丹参、益母草等组成)联合羟苯磺酸钙治疗糖尿病肾病(DN)气虚血瘀证的临床疗效及对血管内皮生长因子(VEGF)、胰岛素样生长因子1(IGF-1)的影响。【方法】将90例DN气虚血瘀证患者随机分为观察组和对照组,每组各45例。所有患者均接受基础降糖治疗和控制血压、调节脂代谢紊乱等治疗。在此基础上,对照组患者给予羟苯磺酸钙治疗,观察组患者在对照组的基础上联合益气化瘀汤治疗,疗程为3个月。观察2组患者治疗前后中医证候积分、肾功能指标及血清VEGF、IGF-1水平的变化情况,并评价2组患者的临床疗效。【结果】(1)疗效方面,治疗3个月后,观察组的总有效率为91.11%(41/45),对照组为75.56%(34/45),组间比较(χ2检验),观察组的疗效明显优于对照组(P<0.05)。(2)中医证候积分方面,治疗1个月和3个月后,2组患者的中医证候积分均较治疗前明显降低(P<0.05),且治疗3个月后又均较治疗1个月后明显降低(P<0.05);组间比较,观察组在治疗1个月和3个月后对中医证候积分的降低作用均明显优于对照组(P<0.01)。(3)肾功能指标方面,治疗后,2组患者的血肌酐(Scr)、尿素氮(BUN)、肾小球滤过率(GFR)等肾功能指标均较治疗前明显改善(P<0.05),且观察组对各项肾功能指标的改善作用均明显优于对照组(P<0.01)。(4)血清VEGF、IGF-1水平方面,治疗后,2组患者的血清VEGF、IGF-1水平均较治疗前明显降低(P<0.05),且观察组对血清VEGF、IGF-1水平的降低作用均明显优于对照组(P<0.01)。(5)治疗过程中,2组患者均无明显不良反应发生,具有较高的安全性。【结论】益气化瘀汤联合羟苯磺酸钙治疗DN气虚血瘀证患者疗效确切,可有效下调血清VEGF、IGF-1水平,明显改善患者肾功能,显著减轻患者临床症状,且具有较高的安全性。

缺血性视网膜静脉阻塞继发黄斑水肿患者基线血清己糖激酶1抗体滴度与抗VEGF治疗后视力改善的相关性分析

目的分析缺血性视网膜静脉阻塞继发黄斑水肿(RVO-ME)患者基线血清己糖激酶1抗体滴度与抗血管内皮生长因子(VEGF)治疗后视力改善的相关性。方法招募2017年6月至2020年2月在首都医科大学宣武医院确诊为缺血性RVO-ME并接受初始抗VEGF治疗的53例患者,其中缺血性视网膜中央静脉阻塞(CRVO)23例(CRVO组),缺血性视网膜分支静脉阻塞(BRVO)30例(BRVO组)。另选取该院同期30例行超声乳化的白内障患者作为对照组。研究对象行基线血清己糖激酶1抗体滴度检测、眼科常规检查和光学相干断层成像(OCT)检查。所有RVO-ME患者按照“3+按需治疗方案(pro re nata,PRN)”向玻璃体内注射抗VEGF药物治疗。随访12个月,采用多元线性回归分析缺血性RVO-ME患者抗VEGF治疗后视力改善的影响因素。结果CRVO组基线logMAR BCVA高于对照组和BRVO组,CRVO组和BRVO组基线CRT、基线血清己糖激酶1抗体滴度高于对照组,且CRVO组基线CRT、基线血清己糖激酶1抗体滴度高于BRVO组,差异有统计学意义(P<0.05)。RVO-ME患者基线血清己糖激酶1抗体滴度与随访6个月(r=0.377,P=0.005)、9个月(r=0.362,P=0.008)和12个月(r=0.465,P<0.001)时BCVA改善呈正相关,与随访12个月时中断EZ横向长度减少值(r=0.401,P=0.001)呈正相关。多元线性回归分析结果显示,基线logMAR BCVA、基线血清己糖激酶1抗体滴度是缺血性RVO-ME患者抗VEGF治疗随访12个月时BCVA改善的影响因素(P<0.05)。结论己糖激酶1抗体作为一种新的血清生物标志物,与缺血性RVO-ME患者抗VEGF治疗后的视力改善相关。

罗沙司他对腹膜透析大鼠腹膜HIF-1α/VEGF信号通路表达及纤维化的影响

目的评估罗沙司他(Roxadustat,ROX)对腹膜透析(Peritoneal dialysis,PD)大鼠腹膜组织的缺氧诱导因子-1α(Hypoxia-inducible factors-1α,HIF-1α)以及血管内皮生长因子(Vascular endothelial growth factor,VEGF)表达的影响,同时探讨其对腹膜纤维化程度的潜在作用及其机制。方法购入30只雄性SPF级大鼠,采用5/6肾脏切除法成功构建尿毒症腹膜透析大鼠模型27只,随机分为空白对照组、PD组、PD+ROX组(联合给予5 mg/kg ROX,每周3次),每组9只,持续给药1个月,在灌胃后6、12、24 h以及4周时,采用ELISA法检测腹膜透析液、血液中HIF-1α和VEGF的浓度。利用HE和Masson染色观察大鼠腹膜组织病理变化,WB和免疫组化检测腹膜组织中HIF-1α、VEGF蛋白表达变化。结果HE和Masson染色观察各组大鼠腹膜组织,与空白对照组比较,PD组大鼠的腹膜组织出现了明显的纤维化和血管增生现象;与PD组相比,PD+ROX组大鼠的腹膜组织纤维化和血管增生现象明显改善。PD组腹膜组织中HIF-1α和VEGF蛋白表达水平显著高于空白对照组(P均<0.05),增加ROX干预后,PD+ROX组大鼠腹膜组织中HIF-1α和VEGF蛋白表达水平显著降低(P均<0.05)。PD+ROX组血清中HIF-1α和VEGF浓度均高于空白对照组和PD组(P均<0.05)。PD+ROX组腹膜透析液中HIF-1α和VEGF浓度均低于空白对照组和PD组(P均<0.05)。结论ROX治疗能有效降低腹膜组织及腹膜透析液中的HIF-1α和VEGF表达水平,缓解由葡萄糖腹膜透析引起的腹膜组织纤维化和血管增生。同时,血清中HIF-1α和VEGF水平的提升有助于改善腹膜组织的缺氧状况,抑制HIF-1α/VEGF信号通路,对抗腹膜纤维化。

Expression of vascular endothelial growth factor and its role in oncogenesis of human gastric carcinoma

AIM: To establish the role of vascular endothelial growth factor (VEGF) in the oncogenesis of human gastric carcinoma more directly. METHODS: The expression of VEGF and its receptor kinase-domain insert containing receptor (KDR) in human gastric cancer tissue were observed by immunohistochemical staining. VEGF levels were manipulated in human gastric cancer cell using eukaryotic expression constructs designed to express the complete VEGF(165) complimentary DNA in either the sense or antisense orientation. The biological changes of the cells were observed in which VEGF was up-regulated or down-regulated. RESULTS: VEGF-positive rate was 50%, and VEGF was mainly localized in the cytoplasm and membrane of the tumor cells, while KDR was mainly located in the membrane of vascular endothelial cells in gastric cancer tissues and peri-cancerous tissue. In 2 cases of 50 specimens, the gastric cancer cells expressed KDR, localized in both the cytoplasm and membrane. Introduction of VEGF(165) antisense into human gastric cancer cells (SGC-7901, immunofluorescence intensity, 31.6%)) resulted in a significant reduction in VEGF-specific messenger RNA and total and cell surface VEGF protein (immunofluorescence intensity, 8.9%) (P【0.05). Conversely, stable integration of VEGF(165) in the sense orientation resulted in an increase in cellular and cell surface VEGF (immunofluorescence intensity, 75.4%) (P【0.05). Lowered VEGF levels were associated with a marked decrease in the growth of nude mouse xenografted tumor (at 33 days postimplantation, tumor volume: 345.40 +/- 136.31 mm3)(P【0.05 vs control SGC-7901 group: 1534.40 +/- 362.88 mm3), whereas up-regulation of VEGF resulted in increased xenografted tumor size (at 33 days postimplantation, tumor volume: 2350.50 +/- 637.70 mm3) (P【0.05 vs control SGC-7901 group). CONCLUSION: This study provides direct evidence that VEGF plays an important role in the oncogenesis of human gastric cancer.

Reduction of tumorigenicity of SMMC-7721 hepatoma cells by vascular endothelial growth factor antisense gene therapy

AIM: To test the hypothesis to block VEGF expression of SMMC-7721 hepatoma cells may inhibit tumor growth using the rat hepatoma model. METHODS: Amplify the 200 VEGF cDNA fragment and insert it into human U6 gene cassette in the reverse orientation transcribing small antisense RNA which could specifically interact with VEGF165, and VEGF121 mRNA. Construct the retroviral vector containing this antisense VEGF U6 cassette and package the replication-deficient recombinant retrovirus. SMMC-7721 cells were transduced with these virus and positive clones were selected with G418. PCR and Southern blot analysis were performed to determine if U6 cassette integrated into the genomic DNA of positive clone. Transfected tumor cells were evaluated for RNA expression by ribonuclease protection assays. The VEGF protein in the supernatant of parental tumor cells and genetically modified tumor cells was determined with ELISA. In vitro and in vivo growth properties of antisense VEGF cell clone in nude mice were analyzed. RESULTS: Restriction enzyme digestion and PCR sequencing verified that the antisense VEGF RNA retroviral vector was successfully constructed.After G418 selection, resistant SMMC-7721 cell clone was picked up. PCR and Southern blot analysis suggested that U6 cassette was integrated into the cell genomic DNA. Stable SMMC-7721 cell clone transduced with U6 antisense RNA cassette could express 200 bp small antisense VEGF RNA and secrete reduced levels of VEGF in culture condition. Production of VEGF by antisense transgene-expressing cells was 65+/-10 ng/L per 10(6) cells, 42045 ng/L per 10(6) cells in sense group and 485+/-30 ng/L per 10(6) cells in the negative control group, (P【 0.05). The antisense-VEGF cell clone appeared phenotypically indistinguishable from SMMC-7721 cells and SMMC-7721 cells transfected sense VEGF. The growth rate of the antisense-VEGF cell clone was the same as the control cells. When S.C. was implanted into nude mice, growth of antisense-VEGF cell lines was greatly inhibited compared with control cells. CONCLUSION: Expression of antisense VEGF RNA in SMMC-7721 cells could decrease the tumorigenicity, and antisense-VEGF gene therapy may be an adjuvant treatment for hepatoma.

Serum vascular endothelial growth factor is a potential biomarker of metastatic recurrence after curative resection of hepatocellular carcinoma

Hepatocellular carcinoma (HCC) is one of the most common malignancies in China. To date, surgery is still the best solution to it. However, metastatic recurrences after curative hepatic resections are very common. Tang et al have reported that recurrence rate within 5 years of curative hepatic resection is 61.5% [1]. As curative hepatic resection has a high tendency for metastatic recurrence, therapeutic interventions such as transarterial embolization and antiangiogenesis have been tried to further improve prognosis of HCC patients. Therefore, establishing a dependable, sensitive, easy, and economical method to predict metastatic recurrence following curative hepatic resection is of clinical urgency.

The Effect of Simvastatin on mRNA Expression of Transforming Growth Factor-β1,Bone Morphogenetic Protein-2 and Vascular Endothelial Growth Factor in Tooth Extraction Socket

Aim To determine the effect of local simvastatin application on the mRNA expression level of transforming growth factor-β1 （TGF-β1）, bone morphogenetic protein-2 （BMP-2） and vascular endothelial growth factor （VEGF） in the tooth sockets of rat. Methodology Forty-eight male Wistar rats were randomly divided into experimental and control groups （n=24）. Polylactic acid/polyglycolic acid copolymer carriers, with or without simvastatin, were implanted into extraction sockets of right mandibular incisors. The expression of TGF-β1, BMP-2 and VEGF mRNA was determined by in situ hybridization in the tooth extraction socket at five days, one week, two weeks and four weeks after implantation. Results The fusiform stroma cells in the tooth extraction socket began to express TGF-β1, BMP-2 and VEGF mRNA in both experimental and control groups from one week after tooth extraction until the end of experiment. The expression of TGF-131 and BMP-2 mRNA in the experimental group was significantly up-regulated after one, two and four weeks, and expression of VEGF mRNA was significantly increased after one and two weeks compared with that in the control group. Conclusion The findings indicate that local administration of simvastatin can influence alveolar bone remodeling by regulating the expression of a school of growth factors which are crucial to osteogenesis in the tooth extraction socket.

Apelin and vascular endothelial growth factor are associated with mobilization of endothelial progenitor cells after acute myocardial infarction

This study was designed to determine the levels of early endothelial progenitor cells （EPCs）, apelin, vascu- lar endothelial growth factor （VEGF） and stromal cell-derived growth factor-1 （SDF-1） after acute myocardial infarction （AMI）, and to investigate the relationships between these cytokines and early EPCs. Early EPCs, de- fined as CD133＋, KDR＋, and CD34~ cells, were quantified by flow cytometry. The levels of early EPCs and those cytokines in AMI patients were significantly different from those with coronary artery disease or controls （P 〈 0.05）. Plasma apelin levels were inversely correlated with Gensini score and early EPCs （both P 〈 0.01）. Early EPCs, VEGF and SDF-1 showed different patterns of changes in AMI patients during the first 24 h. The trend in the change of early EPCs was proportionally correlated with that of VEGF （P 〈 0.05）. AMI patients exhibited in- creased early EPCs with remarkably decreased apelin levels and enhanced VEGF levels.

落新妇苷通过调节HIF-1α/VEGF轴抑制乳腺癌细胞的增殖、迁移和血管生成拟态形成

目的:探究落新妇苷(AST)调节低氧诱导因子-1α(HIF-1α)/血管内皮生长因子(VEGF)轴对乳腺癌细胞增殖、迁移和血管生成拟态(VM)的影响。方法:用不同浓度的AST(0、5、25、50、100、150、200、300μmol/L)处理乳腺癌细胞MCF-7、MDA-MB-231,采用CKK-8法检测细胞活力。将MCF-7、MDA-MB-231细胞分为对照组、AST低剂量(AST-L)组、AST中剂量(AST-M)、AST高剂量(AST-H)组、AST-H+DMOG(HIF-1α/VEGF通路激活剂)组,EdU法检测AST处理对乳腺癌细胞增殖的影响,流式细胞术检测其对细胞凋亡的影响,Transwell小室实验检测其对细胞迁移、侵袭能力的影响,Matrigel管型形成实验检测其对细胞VM形成的影响,WB法检测对细胞中HIF-1α、VEGF、VE-cadherin、E-cadherin、N-cadherin、MMP-2表达的影响。结果:与0μmol/L AST相比,5、25、50、100、150、200、300μmol/L AST处理的细胞活力显著下降,呈剂量依赖性(P<0.05)。与对照组相比,AST-L、AST-M、AST-H组细胞EdU阳性率、细胞迁移数、细胞侵袭数、VM管腔数目、HIF-1α、VEGF、VE-cadherin、N-cadherin、MMP-2表达均显著下降,而细胞凋亡率、E-cadherin蛋白表达显著升高(均P<0.05);与AST-H组相比,AST-H+DMOG组细胞EdU阳性率、细胞迁移数、细胞侵袭数、VM管腔数目、HIF-1α、VEGF、VE-cadherin、N-cadherin、MMP-2表达均显著升高,而细胞凋亡率、E-cadherin蛋白表达均显著下降(均P<0.05)。结论:AST能抑制乳腺癌细胞增殖、迁移、侵袭和VM形成,促进凋亡,其作用机制可能与抑制HIF-1α/VEGF信号通路有关。

STI571 (Glivec) suppresses the expression of vascular endothelial growth factor in the gastrointestinal stromal tumor cell line,GIST-T1

AIM： To estimate whether S-TI571 inhibits the expression of vascular endothelial growth factor （VEGF） in the gastrointestinal stromal tumor （GIST） cells. METHODS： We used GIST cell line, GIST-T1. It has a heterogenic 57-bp deletion in exon 11 to produce a mutated c-KIT, which results in constitutive activation of c-KIT. Cells were treated with/without STI571 or stem cell factor （SCF）. Transcription and expression of VEGF were determined by RT-PCR and flow cytometry or Western blotting, respectively. Activated c-KIT was estimated by immunoprecipitation analysis. Cell viability was determined by PITT assay. RESULTS： Activation of c-KIT was inhibited by STI571 treatment. VEGF was suppressed at both the transcriptional and translational levels in a temporal and dose-dependent manner by STI571. SCF upregulated the expression of VEGF and it was inhibited by S-13571. STI571 also reduced the cell viability of the GIST-T1 cells, as determined by PTT assay. CONCLUSION： Activation of c-KIT in the GIST-T1 regulated the expression of VEGF and it was inhibited by ST571. STI571 has antitumor effects on the GIST cells with respect to not only the inhibition of cell growth, but also the suppression of VEGF expression.

Serum Vascular Endothelial Growth Factor Levels in Patients with Non-small Cell Lung Cancer and Its Relations to the Micrometastasis in Peripheral Blood

To examine the relationship between the levels of the serum vascular endothelial growth factor （VEGF） and the micrometastasis of peripheral blood in patients with non-small cell lung cancer （NSCLC）, 108 NSCLC patients, including 40 patients with benign lung diseases and 30 healthy controls, were investigated. The serum VEGF levels were detected by ELISA and CK19 mRNA in peripheral blood by reverse transcriptase-polymerase chain reaction （RT-PCR）. In NSCLC group, the serum VEGF levels and the positive rate of CK19 mRNA in peripheral blood were 479.8±268.5 pg/mL and 66.7%, which were significantly higher than those of the other two groups respectively （P〈0.01）, and both of them were increased significantly with the progression of clinical stage of the tumors （P〈0.01）. Serum VEGF levels as well as the positive rate of CK19 mRNA in different pathological types of lung cancer had no significant differences （P〉0.05）. Serum VEGF levels in the patients positive for CK19 mRNA was 561.7±325.6 pg/mL. It is significantly higher than that in the negative patients （P〈0.01）. There existed a significant correlation between serum VEGF levels and expression of CK19 mRNA in peripheral blood in NSCLC patients （P〈0.001）. The detection of serum VEGF levels and CK19 mRNA in peripheral blood is helpful in judging the condition and the prognosis of NSCLC patients, and serum VEGF levels and CK19 mRNA are independent of the pathological types of lung cancer. The micrometastasis in peripheral blood of NSCLC patients is significantly associated with serum VEGF levels.

A fusion protein containing murine vascular endothelial growth factor and tissue factor induces thrombogenesis and suppression of tumor growth in a colon carcinoma model

Induction of tumor vasculature occlusion by targeting a thrombogen to newly formed blood vessels in tumor tissues represents an intriguing approach to the eradication of primary solid tumors. In the current study, we construct and express a fusion protein containing vascular endothelial growth factor (VEGF) and tissue factor (TF) to explore whether this fusion protein has the capability of inhibiting tumor growth in a colon carcinoma model. The murine cDNA of VEGF A and TF were amplified by reverse transcriptase polymerase chain reaction (RT-PCR), and then cloned into prokaryotic expression plasmid pQE30 with a linker. The expression product recombinant VEGF-TF (rVEGF-TF) was purified and proved to have comparable enzyme activity to a commercial TF and the capability of specific binding to tumor vessels. Significant decrease of tumor growth was found in the mice administered with rVEGF-TF on Day 6 after initiated rVEGF-TF treatment (P<0.05), and the tumor masses in 2 of 10 mice were almost disappeared on Day 14 after the first treatment. In addition, valid thrombogenesis and tumor necrosis were observed in the tumor tissues injected with rVEGF-TF. Our results demonstrate that occlusion of tumor vasculature with rVEGF-TF is potentially an effective approach for cancer therapy.

“手十二井穴”放血预处理对大鼠急性低氧肺组织损伤模型血气、HIF-1α及VEGF水平的影响

目的 观察“手十二井穴”放血预处理对大鼠急性低氧肺组织损伤模型血气相关指标、低氧诱导因子(HIF)-1α及血管内皮细胞生长因子(VEGF)表达的影响,探讨“手十二井穴”放血预处理对急性低氧肺组织损伤的影响。方法 将72只雄性SD大鼠随机分为对照组8只、低氧(模型)组32只、井穴放血预处理(放血)组32只,模型组和放血组又分为6、24、48、72 h 4个时间段亚组,每组各8只。采用实验动物低氧模拟舱模拟15%O_(2)浓度,制备大鼠急性低氧肺组织损伤模型。放血组按“少商”“商阳”“中冲”“关冲”“少冲”“少泽”的顺序,每天1次,共5 d。用手持式血气分析仪检测肺动脉血气氧分压(PaO_(2))、血氧饱和度(SaO_(2))、酸碱度(pH)、二氧化碳分压(PaCO_(2))等相关指标,采用Western印迹法检测HIF-1α表达,酶联免疫吸附试验(ELISA)法检测VEGF含量。结果 与对照组比较,模型组各时间段PaO_(2)、SaO_(2)明显降低,HIF-1α和VEGF表达水平显著升高(P<0.01)。与同时间段模型组比较,放血组PaO_(2)和SaO_(2)均出现升高,PaO_(2)在6、48 h时有统计学意义,SaO_(2)值在6、24、48 h时有统计学意义(P<0.05,P<0.01),HIF-1α表达在各时段明显下调,VEGF含量在24、48、72 h时明显下降(P<0.05,P<0.01)。但放血组PaO_(2)各时间段和SaO_(2)(6、24 h)仍低于对照组,HIF-1α(6、48、72 h)和VEGF各时间段表达水平仍高于对照组,差异有统计学意义(P<0.05,P<0.01)。结论 “手十二井穴”放血预处理在一定时间和程度上可改善大鼠急性低氧(15%O_(2),85%N_(2))肺组织损伤模型的缺氧情况,其可能的作用与升高动脉血PaO_(2)、SaO_(2)及下调HIF-1α表达、降低VEGF含量有关,从而有利于模型大鼠适应急性低氧环境。

Integrin binding peptides facilitate growth and interconnected vascular-like network formation of rat primary cortical vascular endothelial cells in vitro

Neovascularization and angiogenesis in the brain are important physiological processes for normal brain development and repair/regeneration following insults. Integrins are cell surface adhesion receptors mediating important function of cells such as survival, growth and development during tissue organization, differentiation and organogenesis. In this study, we used an integrin-binding array platform to identify the important types of integrins and their binding peptides that facilitate adhesion, growth, development, and vascular-like network formation of rat primary brain microvascular endothelial cells. Brain microvascular endothelial cells were isolated from rat brain on post-natal day 7. Cells were cultured in a custom-designed integrin array system containing short synthetic peptides binding to 16 types of integrins commonly expressed on cells in vertebrates. After 7 days of culture, the brain microvascular endothelial cells were processed for immunostaining with markers for endothelial cells including von Willibrand factor and platelet endothelial cell adhesion molecule. 5-Bromo-2′-dexoyuridine was added to the culture at 48 hours prior to fixation to assess cell proliferation. Among 16 integrins tested, we found that α5β1, αvβ5 and αvβ8 greatly promoted proliferation of endothelial cells in culture. To investigate the effect of integrin-binding peptides in promoting neovascularization and angiogenesis, the binding peptides to the above three types of integrins were immobilized to our custom-designed hydrogel in three-dimensional(3 D) culture of brain microvascular endothelial cells with the addition of vascular endothelial growth factor. Following a 7-day 3 D culture, the culture was fixed and processed for double labeling of phalloidin with von Willibrand factor or platelet endothelial cell adhesion molecule and assessed under confocal microscopy. In the 3 D culture in hydrogels conjugated with the integrin-binding peptide, brain microvascular endothelial cells formed interconnected vascular-like network with clearly discernable lumens, which is reminiscent of brain microvascular network in vivo. With the novel integrin-binding array system, we identified the specific types of integrins on brain microvascular endothelial cells that mediate cell adhesion and growth followed by functionalizing a 3 D hydrogel culture system using the binding peptides that specifically bind to the identified integrins, leading to robust growth and lumenized microvascular-like network formation of brain microvascular endothelial cells in 3 D culture. This technology can be used for in vitro and in vivo vascularization of transplants or brain lesions to promote brain tissue regeneration following neurological insults.

电针调控HIF-1α/VEGF信号通路对类风湿性关节炎模型踝关节病理学改变的影响

目的探讨电针通过调控HIF-1α/VEGF信号通路活性对类风湿性关节炎(RA)大鼠踝关节病理损伤的影响。方法选取50只SD大鼠,随机分为Sham组(空白对照)、RA组(大鼠构建RA模型)、电针组(RA组大鼠给予电针治疗)、CAY10585组(RA大鼠腹腔内注射HIF-1α/VEGF信号通路抑制剂)、电针+CAY10585组(电针组大鼠腹腔注射HIF-1α/VEGF信号通路抑制剂),每组10只。模型建立后观察各组大鼠基本形态;8周后处死大鼠,比较治疗后大鼠踝关节直径;取大鼠踝关节行HE染色,观察整体病理形态及踝关节病理特征(滑膜细胞增殖、细胞侵蚀、血管翳形成、炎性细胞浸润、骨侵蚀)病理评分;酶联免疫吸附法(ELISA)检测5组大鼠血清炎性因子肿瘤坏死因子-α(TNF-α)、白介素-6(IL-6)水平;Western-blot检测大鼠踝关节组织内软骨基质因子Ⅱ型胶原(CollagenⅡ)、C端肽(CTXⅡ)、Ⅱ型胶原C前肽(CPⅡ)蛋白表达。结果与Sham组比较,RA模型建立可以上调大鼠踝关节直径,踝关节滑膜细胞增殖、细胞侵蚀、血管翳形成、炎性细胞浸润、骨侵蚀病理评分,血清炎性因子(TNF-α、IL-6)水平均明显提升(P<0.05),关节滑膜上皮复层出现增生、间质水肿以及炎性细胞浸润的现象;电针干预可以下调大鼠踝关节直径、踝关节滑膜细胞增殖、细胞侵蚀、血管翳形成、炎性细胞浸润、骨侵蚀病理评分,血清炎性因子(TNF-α、IL-6)水平(P<0.05),同时踝关节病理形态明显得到缓解;CAY10585干预再次增加RA大鼠病理形态,破骨细胞明显增加,骨质出现侵蚀、溶解骨层及炎性细胞浸润的现象,踝关节直径、踝关节滑膜细胞增殖、细胞侵蚀、血管翳形成、炎性细胞浸润、骨侵蚀病理评分,血清炎性因子(TNF-α、IL-6)水平再次提升(P<0.05);电针干预可以逆转CAY10585组大鼠趋势,再次下调大鼠踝关节直径、踝关节滑膜细胞增殖、细胞侵蚀、血管翳形成、炎性细胞浸润、骨侵蚀病理评分(P<0.05);与Sham组比较,RA组大鼠踝关节组织内CTXⅡ表达提升,CollagenⅡ、CPⅡ表达降低(P<0.05);电针干预可以下调CTXⅡ表达,上调CollagenⅡ、CPⅡ、HIF-1α、VEGF表达(P<0.05);CAY10585干预则体现出相反趋势,再次上调CTXⅡ表达,下调CollagenⅡ、CPⅡ、HIF-1α、VEGF表达(P<0.05);电针干预可以逆转CAY10585组大鼠软骨基质及HIF-1α、VEGF表达(P<0.05)。结论电针治疗可以改善RA大鼠踝关节的病理学表现,降低炎性反应,保护软骨损伤,其分子机制可能与激活HIF-1α/VEG信号通路有关。

Evaluation of Serum and Aqueous Humor Vascular Endothelial Growth Factor in Neovascular Glaucoma

Purpose: The study aimed to evaluate and correlate between the levels of vascular endothelial growth factor (VEGF) in serum and aqueous humor in cases of neovascular glaucoma (NVG) to stand up on if it can be used as a marker for early detection of such cases. Methods: This observational case control study included 60 eyes, divided into 3 groups, group A of 30 eyes presented by cataract of different causes (not diabetic patients and no signs of NVG) as a control group and group B of 30 eyes with NVG due to different causes, group C of the same eyes in group B but after one month of treatment by intravitreal bevacizumab and laser treatment by pan retinal photocoagulation (PRP). Serum VEGF was estimated in all groups, also aqueous humor VEGF was estimated in group A and B only. In addition glycosylated hemoglobin (HbA1c) was estimated in group B;statistical analysis of the results was performed. Results: The study revealed that the commonest cause of NVG was proliferative diabetic retinopathy (PDR) in 26 cases (86.7%), HbA1c in group B revealed mean value 7.68% ± 2.75%. Serum VEFG level in the group B of cases of NVG was significantly higher than the control group A (P 0.05). Conclusions: VEGF is considered a good marker for the NVG either in serum or aqueous humor, laser treatment and the use of anti-VEGF are crucial treatment for such cases, and also glycemic control is a must for regulation of the vascular process in diabetic patients for prevention of such ocular neovascularization.

Interleukin-1α, 6 regulate the secretion of vascular endothelial growth factor A, C in pancreatic cancer

Vascular endothelial growth factor (VEGF, namely VEGF-A) is an angiogenic polypeptide and VEGF-C is a lymphangiogenic polypeptide that has been implicated in cancer growth, invasion and metastasis. Several cytokines and growth factors play an important part in cancer progression. These cytokines and growth factors are the principal mediators of cancer cells-stromal cell interaction , which is critical for invasion of cancer cells to the surrounding tissues and metastatic dissemination to distant organs. In this study, we studied VEGF-A, C expression in cultured human pancreatic cancer cell lines and whether the presence of VEGF-A, C in the cell lines is regulated by cytokines interleukin-lct (EL-1α), and interleukin-6 (IL-6). METHODS: We used Northern blot and Western blot methods to analyze expression of the gene and protein of VEGF-A, C in all 6 tested cell lines (ASPC-1, CAPAN-1, MIA-PaCa-2, PANC-1, COLO-357 and T3M4) respectively. To analyze what is the regulator for this VEGF-A, C expression in pancreatic cancer,we used the reverse transcription -polymerase chain reaction (RT-PCR) method to analyze VEGF-A, C expression in cultured human pancreatic cancer cell lines (CAPAN-1 and COLO-357) under the stimulation with IL-1α (10μg/L) or IL-6 (100 μg/L). RESULTS:Northern blot analysis revealed the presence of the 4.1-kb VEGF-A mRNA transcript and 2.4-kb VEGF-C mRNA transcript in all 6 tested cell lines. Immunoblotting with highly specific anti-VEGF-A, anti-VEGF-C antibody revealed the presence of a molecular weight of 43-kDa VEGF-A protein and 55-kDa VEGF-C protein in all the cell lines. RT-PCR analysis revealed the levels of the VEGF-A and VEGF-C gene were 1-2 fold and a 1-fold increase in the COLO-357 cell line by stimulation with IL-la, however, no effect was found in the CAPAN-1 cell line. The levels of the VEGF-A and VEGF-C gene were 2-5 fold and a 1-fold increase in the CAPAN-1 cell line by stimulation with IL-6, but, no effect was found in the COLO-357 cell line. CONCLUSION:These findings suggested that the expression of VEGF-A, C and their regulation by IL-1α, IL-6 in pancreatic cancer contributes to the lymphatic and distant metastasis and the disease progression.