转录因子Sp1表达与肝癌临床病理特征及预后的关系

目的:通过研究肝癌组织内转录因子Sp1的表达及其与肝癌患者临床病理特征及预后的关系,探讨转录因子Sp1作为肝癌预后预测指标的可行性。方法:对98例根治性切除术的肝细胞肝癌肿瘤组织芯片进行免疫组化检测Sp1的表达情况,分析其与肝癌患者临床病理特征及预后之间的关系。结果:免疫组化结果显示Sp1在肝癌组织中表达明显高于对应正常肝脏组织,在有微血管侵犯的患者中升高尤其明显。进一步分析显示Sp1表达与肝癌患者术后总体生存率呈负相关,而与肝癌患者术后复发率呈正相关。结论:转录因子Sp1在肝癌中明显高表达,可作为肝癌患者预后的独立预测指标。

Sp1 contributes to overexpression of stanniocalcin 2 through regulation of promoter activity in colon adenocarcinoma

BACKGROUND Aberrant expression of stanniocalcin 2 (STC2) is implicated in colon adenocarcinoma (COAD). A previous study identified that STC2 functions as a tumor promoter to drive development of some cancers, but the role of its overexpression in the development of COAD remains unclear. AIM To evaluate the regulation mechanism of STC2 overexpression in COAD. METHODS The expression of STC2 in COAD was assessed by TCGA COAD database and GEO (GSE50760). Methylation level of the STC2 promoter was evaluated with beta value in UALCAN platform, and the correlation between STC2 expression and survival rate was investigated with TCGA COAD. Transcription binding site prediction was conducted by TRANSFAC and LASAGNA, and a luciferase reporter system was used to identify STC2 promoter activity in several cell lines, including HEK293T, NCM460, HT29, SW480, and HCT116. Western blotting was performed to evaluate the role of Sp1 on the expression of STC2. RESULTS The central finding of this work is that STC2 is overexpressed in COAD tissues and positively correlated with poor prognosis. Importantly, the binding site of the transcription factor Sp1 is widely located in the promoter region of STC2. A luciferase reporter system was successfully constructed to analyze the transcription activity of STC2, and knocking down the expression of Sp1 significantly inhibited the transcription activity of STC2. Furthermore, inhibition of Sp1 remarkably decreased protein levels of STC2. CONCLUSION Our data provide evidence that the transcription factor Sp1 is essential for the overexpression of STC2 in COAD through activation of promoter activity. Taken together, our finding provides new insights into the mechanism of oncogenic function of COAD by STC2.

Transcription factors specificity protein and nuclear receptor 4A1 in pancreatic cancer

Specificity protein(Sp)transcription factors(TFs)Sp1,Sp3 and Sp4,and the orphan nuclear receptor 4A1(NR4A1)are highly expressed in pancreatic tumors and Sp1 is a negative prognostic factor for pancreatic cancer patient survival.Results of knockdown and overexpression of Sp1,Sp3 and Sp4 in pancreatic and other cancer lines show that these TFs are individually pro-oncogenic factors and loss of one Sp TF is not compensated by other members.NR4A1 is also a prooncogenic factor and both NR4A1 and Sp TFs exhibit similar functions in pancreatic cancer cells and regulate cell growth,survival,migration and invasion.There is also evidence that Sp TFs and NR4A1 regulate some of the same genes including survivin,epidermal growth factor receptor,PAX3-FOXO1,α5-andα6-integrins,β1-,β3-andβ4-integrins;this is due to NR4A1 acting as a cofactor and mediating NR4A1/Sp1/4-regulated gene expression through GC-rich gene promoter sites.Several studies show that drugs targeting Sp downregulation or NR4A1 antagonists are highly effective inhibitors of Sp/NR4A1-regulated pathways and genes in pancreatic and other cancer cells,and the triterpenoid celastrol is a novel dual-acting agent that targets both Sp TFs and NR4A1.

Effect of Sirpα1 on the expression of nuclear factor-kappa B in hepatocellular carcinoma

BACKGROUND:Signal regulatory protein alpha1(Sirpα1) is a member of Sirps families containing four immunoreceptor tyrosine-based inhibitory motifs(ITIMs) domains in the cytoplasm of and an activated substrate of receptor tyrosine kinase(RTK),that negatively regulates the RTK-dependent cell proliferating signal transduction pathway.Previously we found that Sirpα1 was closely associated with the occurrence and development of hepatocellular carcinoma(HCC)as well as liver regeneration.Since it is unclear about the regulatory mechanisms,we established the cell line transfected Sirpα1 gene and preliminarily clarified the mechanisms by which Sirpα1 negatively regulates the carcinogenesis and development of HCC. METHODS:Liver cancer Sk-Hep1 cell was respectively transfected with plasmids of pLXSN,pLXSN-Sirpα1 and pLXSN-Sirpα1Δ4Y 2 ,screened with the drug of G418(1200 μg/ml),and various transfected Sk-Hep1 cell lines were obtained.The protein expressions of P65,P50,IκBα,cyclin D1 and Fas in various Sk-Hep1 cell lines were determined by Western blotting,and P65 and P50 were localized by the immunofluorescence technique. RESULTS:Sirpα1 could significantly upregulate the protein expression of IκBα(vs.other cell lines,P<0.05) in the Sk-Hep1 cell,and downregulate the protein expressions of P65,P50 and cyclin D1(vs.other cell lines, P<0.05)in the Sk-Hep1 cell.P65 protein expression was mainly localized in the cytoplasm in the pLXSN Sk-Hep1 cell,and in the nucleus of the Sk-Hep1 cell with mutantSirpα1Δ4Y 2 ,but in nucleus of the Sk-Hep1 cell with wild Sirpα1.P50 protein expression was localized in the cytoplasm and nucleus of the pLXSN Sk-Hep1 cell,but in the nucleus of the Sk-Hep1 cell with wild Sirpα1 and mutant Sirpα1Δ4Y 2 plasmid. CONCLUSIONS:Sirpα1 might negatively regulate and control the abnormal proliferation of liver cancer cells by influencing the protein content and localization of nuclear factor-kappa B,then influence the expression of cyclins such as cyclin D1 in the signal transduction pathway.It may be one of the important mechanisms by which Sirpα1 negatively regulates the carcinogenesis and development of HCC.

转移相关基因2在胃癌中的表达及其与核转录因子Sp1的相关性

目的观察转移相关基因2（MTA2）在胃癌组织中的表达特征，明确MTA2表达与核转录因子Sp1表达的相关性。方法采用免疫组织化学染色技术（IHC）和逆转录-聚合酶链式反应（RT-PCR）法，检测83例手术切除的胃癌原发灶和对应癌旁胃黏膜组织中MTA2的表达情况。采用IHC方法检测上述标本中核转录因子Sp1的表达。结果MTA2在胃癌组织中的阳性表达率为31．3％，明显高于癌旁胃黏膜组织（12．0％），差异有统计学意义（P〈0．01）。MTA2阳性与胃癌的浸润深度相关（X^2=5．677，P〈0．05），但与患者的性别、年龄、分化程度、Lauren分型、淋巴结转移、远处转移和TNM分期无明显相关。MTA2的表达与胃癌组织中核转录因子Sp1的表达有关（r=0．320，P〈0．05），MTA2在Sp1阳性表达的胃癌组织中的表达率显著高于Sp1阴性表达者（X2：9．565，P〈0．01）。RT-PCR检测结果显示，在Sp1高表达的胃癌组织中，MTA2 mRNA表达水平升高。结论MTA2在胃癌组织中的表达率高于癌旁胃黏膜组织，并与胃癌的浸润深度相关。MTA2在核转录因子Sp1阳性胃癌组织中呈高度表达，可能与Sp1的转录调控有关。

Requirement for endogenous heat shock factor 1 in inducible nitric oxide synthase induction in murine microglia

Aim Inducible nitric oxide synthase （iNOS） makes a great contribution to host defense and inflamma-tion. In many settings, lipopolysaccharide （LPS） induces iNOS expression through activation of the inhibitor of KB- α （IKB-α） -nuclear factor-KB （NF-KB） cascade, whereas interferon-γ （IFN-γ） acts through Janus kinase （ JAK）- signal transducer and activator of transcription 1 （ STAT1 ） signals. Heat shock factor 1 （ HSF1 ）, a major regulator of heat shock protein transcription, has been shown to regulate the production of pro-inflammatory cytokines such as tumor necrosis factor-α（TNF-α） and interleukin-6 （IL-6）. But it remains obscure whether and how HSF1 affects iNOS induction. Methods Western blot was used to measure the protein expression. The mRNA level was meas- ured by real time-PCR. Silence of HSF1 was achieved by small interfering RNA. Nitric oxide （NO） content and NF-KB binding activity were assayed by commercial kits. Chromatin immunoprecipitation （CHIP） was used to measure the binding activity of NF-KB and STAT1 to iNOS promoters. Results HSF1 inhibition or knockdown pre- vented the LPS- and/or IFN-γ-stimulated iNOS protein expression in cultured microglia. HSF1 inhibition blocked iNOS mRNA transcription. These inhibitory effects of HSF1 inhibition on iNOS expression were confirmed in brain tissues from endotoxemic mice. Further analysis showed that HSF1 inhibition had no effect on IKB-α degradation and NF-KB or STAT1 phosphorylation in LPS/IFN-γ-stimulated cells. The nuclear transport of active NF-KB or STAT1 was also not affected by HSF1 inhibition. But HSF1 inhibition reduced the binding of NF-KB and STAT1 to their DNA elements. In addition, HSF1 inhibition reduced NF-KB and STAT1 bindings to iNOS promoter inside the LPS/IFN-γ-stimulated cells. Conclusions This preventing effect of HSF1 inhibition on iNOS mRNA transcription presents the necessary role of HSF1 in iNOS induction.

Study on the relationship between the expression of NFκB1 and LncRNA-PACER in peripheral blood mononuclear cells of patients with pulmonary tuberculosis

Objective: To investigate the expression relationship between nuclear transcription factor kappa B1 (NFκB1) and long non-coding RNA PACER (LncRNA-PACER) in peripheral blood mononuclear cells (PBMCs) of patients with pulmonary tuberculosis. Methods: From February 2018 to March 2019, 40 patients with pulmonary tuberculosis (tuberculosis group) and 40 healthy persons (control group) were collected, the levels of TNF-α, IL-6 and IL-8 in serum were detected by enzyme-linked immunosorbent assay (ELISA);the expressions of LncRNA-PACER and NFκB1 mRNAs in PBMCs were detected by real-time fluorescence quantitative PCR;Western blot was used to detect the expressions of NFκB1 and COX 2 in PBMCs;Pearson method was used to analyze the expressions of LncRNA-PACER and NFκB1 in PBMCs of patients with pulmonary tuberculosis, and the expressions of LncRNA-PACER and NFκB1 in PBMCs of patients with pulmonary tuberculosis were analyzed. Results: Compared with the control group, the expressions of TNF-α, IL-6 and IL-8 in the serum of patients with pulmonary tuberculosis was significantly increased (P<0.05), and the expressions of LncRNA-PACER, NFκB1 mRNAs, proteins and COX-2 protein in PBMCs were significantly increased (P<0.05). The expressions of LncRNA-PACER and NFκB1 proteins in PBMCs were related to the number of pulmonary lesions and pulmonary cavity (P<0.05), and there was a positive correlation between the expression of LncRNA-PACER and the expression of NFκB1 mRNA in PBMCs of patients with pulmonary tuberculosis (r = 0.873, P<0.05). Conclusions: The expressions of NFκB1 and LncRNA-PACER in PBMCs of patients with pulmonary tuberculosis are significantly increased, they are positively correlated and both of them are related to the occurrence and development of pulmonary tuberculosis.

Decline in the expression of IL-2 after trauma and changes in the nuclear transcription factors NFAT and AP-1

OBJECTIVE: To investigate whether the decrease in expression of interleukin-2 (IL-2) after trauma is associated with changes in DNA binding activity of nuclear factor of activated T cells (NFAT) and activator protein-1 (AP-1). METHODS: Mice with closed impact injury with fracture in both hind limbs were adopted as the trauma model. Spleen lymphocytes were isolated from traumatized mice and stimulated with Con-A. Culture supernatants were assayed for IL-2 activity, and total RNA was extracted from spleen lymphocytes and assayed for IL-2 mRNA. DNA binding activity of NFAT and AP-1 were measured by electrophoretic mobility shift assay (EMSA). The expression of c-Fos, c-Jun and JunB proteins was determined by the Western blot analysis. RESULTS: DNA binding activity of NFAT and AP-1 gradually decreased to a minimum of 41% and 49%, respectively, of the control on the 4th day after injury, which was closely followed by the decline in IL-2 activity and IL-2 mRNA. A decrease in the expression of c-Fos on the 1st and 4th day after trauma had no significant effect on c-Jun expression; the increase in expression of JunB was only on the 1st day after injury. CONCLUSION: Decreased IL-2 expression is, at least in part, due to a decline in the activation of NFAT and AP-1 in traumatized mice. The decline in DNA binding activity of NFAT and AP-1 is partly due to a trauma-induced block in the expression of c-Fos.

Activation of G-protein-coupled receptor 39 reduces neuropathic pain in a rat model

Activated G-protein-coupled receptor 39(GPR39)has been shown to attenuate inflammation by interacting with sirtuin 1(SIRT1)and peroxisome proliferator-activated receptor-γcoactivator 1α(PGC-1α).However,whether GPR39 attenuates neuropathic pain remains unclear.In this study,we established a Sprague-Dawley rat model of spared nerve injury-induced neuropathic pain and found that GPR39 expression was significantly decreased in neurons and microglia in the spinal dorsal horn compared with sham-operated rats.Intrathecal injection of TC-G 1008,a specific agonist of GPR39,significantly alleviated mechanical allodynia in the rats with spared nerve injury,improved spinal cord mitochondrial biogenesis,and alleviated neuroinflammation.These changes were abolished by GPR39 small interfering RNA(siRNA),Ex-527(SIRT1 inhibitor),and PGC-1αsiRNA.Taken together,these findings show that GPR39 activation ameliorates mechanical allodynia by activating the SIRT1/PGC-1αpathway in rats with spared nerve injury.

慢性心力衰竭患者血清TFAM、PGC-1α、NRF-1水平与心功能的相关性

目的探究慢性心力衰竭(CHF)患者血清线粒体转录因子A(TFAM)、过氧化物酶体增殖物激活受体γ共激活因子1α(PGC-1α)、核呼吸因子1(NRF-1)水平与心功能的相关性。方法选取2022年1月至2023年1月于哈尔滨市第一医院经检查确诊的105例CHF患者作为CHF组,根据纽约心脏病协会(NYHA)心功能分级将CHF组患者分为Ⅰ~Ⅱ级42例、Ⅲ级35例、Ⅳ级28例;选取同期于本院体检的健康检查者105例为对照组,比较两组及CHF组不同心功能分级血清TFAM、PGC-1α、NRF-1水平以及心功能指标。Pearson法分析CHF组患者血清TFAM、PGC-1α、NRF-1水平与心功能指标的关系。结果CHF组患者血清TFAM、PGC-1α、NRF-1水平低于对照组(P<0.05)。CHF组患者左室舒张末期内径(LVEDD)、左室收缩末期内径(LVESD)水平高于对照组,左室射血分数(LVEF)水平低于对照组(P<0.05)。随着心功能分级(NYHAⅠ~Ⅱ级、Ⅲ级和Ⅳ级)逐渐升高,CHF组患者血清TFAM、PGC-1α、NRF-1水平逐渐降低(P<0.05);LVEDD、LVESD水平逐渐升高,LVEF水平逐渐降低(P<0.05)。相关性分析显示,LVEF与血清TFAM、PGC-1α、NRF-1水平呈正相关(r=0.474、r=0.461、r=0.513,P<0.05);LVEDD与血清TFAM、PGC-1α、NRF-1水平呈负相关(r=-0.511、r=-0.502、r=-0.475,P<0.05);LVESD与血清TFAM、PGC-1α、NRF-1水平呈负相关(r=-0.497、r=-0.515、r=-0.462,P<0.05)。结论CHF患者血清TFAM、PGC-1α、NRF-1水平降低,且三者与心功能指标密切相关。

慢性间断缺氧通过上调大鼠海马HMGB1和NF-κB损伤学习记忆

目的:探索慢性间断缺氧(CIH)导致大鼠学习记忆功能障碍,以及对海马区高迁移率族蛋白1(HMGB1)和核转录因子-κB(NF-κB)表达的影响。方法:制作CIH大鼠模型,40只SD大鼠分为常氧组(normoxia)、缺氧4周组(CIH4组)、缺氧8周组(CIH8组)和缺氧12周组(CIH12组)。采用Morris水迷宫评估大鼠学习记忆能力,免疫组织化学染色和ELISA法检测大鼠海马区HMGB1和NF-κB的表达。结果:与常氧组相比,CIH12和CIH8组的逃避潜伏期延长,穿越平台次数和平台所在象限停留时间显著缩短,CIH4组的无显著差异。另外,常氧组海马区HMGB1和NF-κB的表达未见明显表达,CIH4组可见少许表达,CIH8组和CIH12组可见明显表达,同时CIH12组的表达显著高于CIH8组。结论:CIH可导致大鼠的学习记忆功能下降,且间断缺氧时间越长对其学习记忆功能的影响越显著。此外,CIH还导致海马区HMGB1和NF-κB的表达水平升高,并且缺氧12周比8周增加更为明显。

动脉瘤性蛛网膜下腔出血患者开颅夹闭术后血清KLF5 mRNA和lncRNA NEAT1表达及其与认知功能的相关性研究

目的探讨动脉瘤性蛛网膜下腔出血患者开颅夹闭术后血清Kruppel样因子5(KLF5)微小RNA(mRNA)和长链非编码RNA核富含丰富的转录本1(lncRNA NEAT1)表达与认知功能的相关性。方法选取2021年2月至2022年4月在该院进行开颅夹闭术的110例动脉瘤性蛛网膜下腔出血患者作为研究对象。术后根据认知功能的评分分为认知功能正常(≥26分,对照组)和认知功能障碍(<26分,研究组)。采用实时荧光定量聚合酶链反应检测血清KLF5 mRNA和lncRNA NEAT1水平;采用简易精神状态量表(MMSE)和蒙特利尔认知评估量表(MoCA)评分评定患者的认知功能水平;采用Pearson相关分析血清KLF5 mRNA与lncRNA NEAT1的相关性及二者与认知功能障碍的相关性;采用多因素Logistic回归分析动脉瘤性蛛网膜下腔出血患者认知功能障碍的影响因素;绘制受试者工作特征(ROC)曲线分析血清KLF5 mRNA和lncRNA NEAT1水平单独及二者联合对动脉瘤性蛛网膜下腔出血患者认知功能障碍的诊断价值。结果对照组纳入67例患者,研究组纳入43例患者。术后早期研究组血清KLF5 mRNA和lncRNA NEAT1水平均显著高于对照组,且术后早期血清KLF5 mRNA和lncRNA NEAT1水平均显著高于术前,差异均有统计学意义(P<0.05)。研究组MMSE和MoCA评分均显著低于对照组,差异均有统计学意义(P<0.05)。Pearson相关分析结果显示,血清KLF5 mRNA和lncRNA NEAT1水平呈正相关(P<0.05),且二者均与MMSE和MoCA评分均呈负相关(P<0.05)。多因素Logistic回归分析结果显示,KLF5 mRNA、lncRNA NEAT1高表达均为动脉瘤性蛛网膜下腔出血患者认知功能障碍的危险因素(P<0.05)。ROC曲线分析结果显示,KLF5 mRNA诊断动脉瘤性蛛网膜下腔出血患者认知功能障碍的曲线下面积(AUC)为0.814,lncRNA NEAT1诊断动脉瘤性蛛网膜下腔出血患者认知功能障碍的AUC为0.872,二者联合诊断动脉瘤性蛛网膜下腔出血患者认知功能障碍的AUC为0.950,二者联合诊断优于KLF5和lncRNA NEAT1各自单独诊断(Z联合vs.KLF5mRNA=2.547、Z联合vs.lncRNA NEAT1=3.268,P<0.05)。结论动脉瘤性蛛网膜下腔出血患者开颅夹闭术后血清KLF5 mRNA和lncRNA NEAT1表达升高与认知功能障碍有关,二者联合检测可以更好地预测认知功能障碍的发生。

胃癌组织中NF-κB、PD-1、PD-L1的表达及其临床意义

目的探讨胃癌组织中核转录因子-κB(nuclear factor kappa B,NF-κB)、程序性细胞死亡蛋白-1(programmed cell death protein-1,PD-1)、程序性细胞死亡蛋白配体-1(programmed cell death protein ligand 1,PD-L1)的表达及其临床意义。方法选择2021年1月至2023年12月于南阳市第一人民医院治疗的62例胃癌患者手术切除后组织标本及癌旁正常组织标本分别作为胃癌组及癌旁组。62例患者中,男39例,女23例,年龄(61.86±2.31)岁,肿瘤长径(4.92±0.53)cm。采用免疫组织化学染色法检测NF-κB、PD-1、PD-L1表达情况。比较两组NF-κB、PD-1、PD-L1表达阳性率,分析其与胃癌临床病理特征的关系。采用χ^(2)检验。结果胃癌组NF-κB、PD-1、PD-L1表达阳性率高于癌旁组[83.87%(52/62)比33.87%(21/62)、75.81%(47/62)比30.65%(19/62)、80.65%(50/62)比40.32%(25/62)],差异均有统计学意义(χ^(2)=32.008、25.396、21.088,均P<0.05);肌层及浆膜层浸润、有淋巴结转移及Ⅲ+Ⅳ期患者NF-κB表达阳性率高于黏膜及黏膜下层浸润、无淋巴结转移及Ⅰ+Ⅱ期患者[92.68%(38/41)比66.67%(14/21)、94.74(36/38)比66.67%(16/24)、92.31%(36/39)比69.57%(16/23)],差异均有统计学意义(χ^(2)=5.158、6.619、3.978,均P<0.05);肌层及浆膜层浸润、有淋巴结转移及Ⅲ+Ⅳ期患者PD-1表达阳性率高于黏膜及黏膜下层浸润、无淋巴结转移及Ⅰ+Ⅱ期患者[85.37%(35/41)比57.14%(14/21)、89.47%(34/38)比54.17%(13/24)、89.74%(35/39)比52.17%(12/23)],差异均有统计学意义(χ^(2)=6.031、9.998、11.135,均P<0.05);低分化、肌层及浆膜层浸润、有淋巴结转移及Ⅲ+Ⅳ期患者PD-L1表达阳性率高于高中分化、黏膜及黏膜下层浸润、无淋巴结转移及Ⅰ+Ⅱ期患者[96.00%(24/25)比70.27%(26/37)、90.24%(37/41)比61.90%(13/21)、92.11%(35/38)比62.50%(15/24)、94.87%(37/39)比56.52%(13/23)],差异均有统计学意义(χ^(2)=4.787、5.445、6.472、11.286,均P<0.05)。结论胃癌组织中NF-κB、PD-1、PD-L1表达阳性率升高,且NF-κB、PD-1表达与胃癌浸润深度、淋巴结转移及TNM分期有关,PD-L1表达与胃癌分化程度、浸润深度、淋巴结转移及TNM分期有关。

血清LncRNA NEAT1、TFF1在视网膜母细胞瘤中的表达及预后评估价值

目的分析视网膜母细胞瘤(Rb)患儿血清长链非编码RNA核内富集转录物1(LncRNA NEAT1)、三叶因子1(TFF1)表达及预后评估价值。方法选取2018年1月—2021年1月首都医科大学附属北京安贞医院南充医院眼科手术治疗的Rb患儿85例作为Rb组,以同期体检健康者60例为健康对照组。采用实时荧光定量PCR检测血清LncRNA NEAT1水平,采用酶联免疫吸附试验检测血清TFF1;分析血清LncRNA NEAT1、TFF1与临床病理特征的关系;Cox回归分析Rb预后影响因素;受试者工作特征(ROC)曲线分析血清LncRNA NEAT1、TFF1对Rb患儿预后的评估价值。结果Rb组血清LncRNA NEAT1水平高于健康对照组,血清TFF1低于健康对照组(t/P=38.305/<0.001、34.858/<0.001)。与肿瘤直径<20 mm、病理分化型Rb患儿比较,肿瘤直径≥20 mm、未分化型Rb患儿血清LncRNA NEAT1较高,TFF1较低(LncRNA NEAT1:t/P=17.925/<0.001,16.848/<0.001;TFF1:t/P=12.505/<0.001,8.120/<0.001)。血清LncRNA NEAT1高表达组3年无进展生存率低于低表达组(57.50%vs.88.89%),TFF1低表达组3年无进展生存率低于高表达组(57.14%vs.90.70%)(Log rankχ^(2)/P=13.551/<0.001、15.310/<0.001)。病理未分化型、血清LncRNA NEAT1升高是影响Rb预后的危险因素,血清TFF1升高是其保护因素[HR(95%CI)=1.523(1.147~2.024),1.473(1.108~1.957),0.612(0.413~0.908)];血清LncRNA NEAT1、TFF1及二者联合预测Rb预后的曲线下面积分别为0.836、0.861、0.921,二者联合大于血清LncRNA NEAT1、TFF1单项检测(Z=4.823、4.312,P均<0.001)。结论Rb患儿血清LncRNA NEAT1升高,血清TFF1水平降低,两者与肿瘤最大径及病理分型有关,均是影响Rb患儿预后的因素,两者联合有助于评估患者预后。

盘状结构域受体1通过调控NF-κB/NLRP3信号通路介导的细胞焦亡对高糖诱导血管内皮功能障碍的影响

目的 探究盘状结构域受体1 (discoidin domain receptor 1,DDR1)对高糖诱导血管内皮细胞功能障碍的作用机制。方法 体外培养人脐静脉内皮细胞(human umbilical vein endothelial cells,HU VECs),首先分为对照组(Control)、高糖诱导组(high glucose,HG),采用33 mmol·L^(-1) D-glucose处理48 h构建HUVECs功能障碍。碘化丙啶染色(PI)检测细胞焦亡情况;酶联免疫吸附法(ELISA)测定乳酸脱氢酶(lactate dehydrogenase,LDH)、IL-1β、IL-18水平;Western blot检测DDR1、NF-κB/NLRP3信号通路蛋白及细胞焦亡相关蛋白表达;随后,实验分为C ontrol组、HG组、HG+DDR1 NC组、HG+DDR1 siRNA组。转染DDR1 siRNA 24 h后观察HG对HUVECs增殖和迁移能力的影响;ELISA检测内皮型一氧化氮合成酶(endothelial nitric oxide synthase,eNOS)、血管细胞黏附分子-1(vascular cell adhesion molecule-1,VCAM-1)、细胞间黏附分子-1 (intercellular adhesion molecule-1,ICAM-1)及LDH、IL-1β、IL-18水平;PI检测细胞焦亡情况;Western blot检测DDR1、NF-κB/NLRP3信号通路蛋白及细胞焦亡相关蛋白表达。结果 与Control组相比,HG组细胞eNOS含量降低,VCAM-1、ICAM-1含量升高,细胞活力及迁移能力降低,DDR1、p-NF-κB、NLRP3及细胞焦亡相关蛋白表达均明显升高,且LDH、IL-1β、IL-18水平及细胞焦亡率均增加(P<0.05)。与HG组相比,DDR1siRNA能够促进eNOS分泌,降低VCAM-1、ICAM-1、LDH、IL-1β、IL-18水平,增加细胞活力和迁移能力,降低p-NF-κB、NLRP3及细胞焦亡相关蛋白表达,抑制高糖诱导的HU VECs焦亡(P<0.05)。结论基因沉默DDR1能够改善高糖诱导的血管内皮细胞功能障碍,其机制与抑制NF-κB/NLRP3信号通路介导的细胞焦亡相关。

补阳还五汤对动脉粥样硬化模型小鼠SIRT1/HMGB1/NF-κB通路及炎症反应的影响

目的:观察补阳还五汤对动脉粥样硬化模型载脂蛋白E基因敲除(ApoE^(-/-))小鼠沉默信息调节因子相关酶1(SIRT1)/高迁移率族蛋白B1(HMGB1)/核转录因子-κB(NF-κB)信号通路及炎症反应的影响。方法:小鼠适应性饲养2周后,ApoE^(-/-)小鼠给予高脂饲料喂养进行动脉粥样硬化模型制备。8周后分离小鼠主动脉根部,制备石蜡切片,油红O染色证实模型复制成功。将40只ApoE^(-/-)小鼠随机分为模型组、补阳还五汤低剂量组、补阳还五汤中剂量组、补阳还五汤高剂量组,每组10只;另将10只C57BL/6J小鼠继续普通饲料喂养设置为空白组,各组小鼠均干预4周。采用酶联免疫吸附法(ELISA)检测小鼠血清炎性因子[γ干扰素(IFN-γ)、肿瘤坏死因子α(TNF-α)、白细胞介素(IL)-12、IL-1β]表达水平;蛋白免疫印迹法(Western Blot)检测小鼠主动脉SIRT1、HMGB1、NF-κB蛋白表达。结果:补阳还五汤可升高小鼠主动脉斑块中SIRT1蛋白表达,降低HMGB1、NF-κB蛋白表达及小鼠血清IFN-γ、TNF-α、IL-12、IL-1β表达。结论:补阳还五汤可能通过调控SIRT1/HMGB1/NF-κB信号通路,减低炎症反应,发挥抗动脉粥样硬化的作用。

多囊卵巢综合征伴胰岛素抵抗相关信号通路的研究进展

多囊卵巢综合征(PCOS)是一种好发于青春期及育龄期女性的涉及诸多因素的内分泌代谢性疾病,临床主要表现为闭经、体胖、多毛痤疮以及妊娠率显著降低,但目前其病因病机尚不清楚。胰岛素抵抗(IR)与多种慢性非传染性疾病(高血压、糖尿病、心脑血管疾病、PCOS等)相关,目前已知磷脂酰肌醇-3-激酶/蛋白激酶B、肝激酶B1/AMP活化的蛋白激酶、沉默信息调节因子1/叉头框转录因子O1、Toll样因子4/核因子κB信号通路参与了PCOS伴IR(PCOS-IR)的作用机制,因此充分认识PCOS-IR的发病机制在疾病预防中有重要临床意义。

SIRT3抑制PARP-1活性缓解多巴胺能神经元炎症损伤

目的研究多巴胺能神经元SIRT3表达对小胶质细胞活化所致其炎症损伤的抵抗作用及相关机制。方法建立多巴胺能神经元MN9D细胞与小胶质细胞BV-2共培养体外炎症损伤模型。将MN9D细胞分为对照组、模型组、SIRT3组、SIRT3+PJ34(PARP-1抑制剂)组。实时定量聚合酶链式反应分析mRNA水平,流式细胞术检测细胞凋亡率,JC-1法检测线粒体膜电位变化,酯化钙黄绿素与氯化钴共孵育法分析线粒体通透性转运孔(mPTP)开放情况,Western blot检测蛋白表达情况。结果与模型组比较,SIRT3过表达则使SIRT3组MN9D细胞的凋亡率明显降低,SIRT3和SOD_(2)基因表达明显增多,PARP-1、TNF-α及IL-1β蛋白表达明显减少,p-NF-κB p65/NF-κB p65比值明显变小,线粒体膜电位上升,mPTP开放和ROS生成减少,组间比较差异均具有统计学意义(P<0.05);SIRT3+PJ34组MN9D细胞PARP-1活性抑制后,除SIRT3和IL-1β蛋白表达变化不明显外,其它考察指标的变化趋势在SIRT3组基础上进一步增大,两组间比较差异均具有统计学意义(P<0.05)。结论SIRT3表达能够缓解小胶质细胞激活所致多巴胺能神经元的炎症损伤,机制可能与其改善线粒体功能,减少ROS生成抑制PARP-1活性及NF-κB信号通路有关。

甘草甜素对大鼠幽门螺杆菌相关性胃炎的改善作用及机制

目的探讨甘草甜素(GL)对大鼠幽门螺杆菌(HP)相关性胃炎的改善作用及机制。方法以接种1×10^(9) cfu/mL HP建立HP相关性胃炎大鼠模型,将造模成功大鼠随机分为模型组、阳性对照组(HP标准四联方案)和GL低、中、高剂量组(5、20、50mg/kg),每组12只;另取12只正常大鼠作为正常对照组。除正常对照组和模型组大鼠灌胃等体积生理盐水外,其他各组大鼠灌胃相应药物,每天1次,连续30 d。给药结束后大鼠行13C尿素呼气试验,记录超基准值(DOB);观察大鼠胃黏膜组织病理变化和细胞形态学变化,并进行病理评分;检测大鼠胃黏膜组织中白细胞介素8(IL-8)、IL-1β、肿瘤坏死因子α(TNF-α)、活性氧(ROS)、丙二醛(MDA)水平,高迁移率族蛋白B1(HMGB1)、核因子κB(NF-κB)m RNA相对表达量,一氧化氮合酶(iNOS)、HMGB1蛋白相对表达量以及NF-κB p65磷酸化水平。结果与正常对照组比较,模型组大鼠DOB值,胃黏膜组织病理评分,IL-8、IL-1β、TNF-α、ROS、MDA水平,HMGB1、NF-κB mRNA相对表达量,iNOS、HMGB1蛋白相对表达量和NF-κB p65磷酸化水平均显著升高(P<0.05);大鼠胃黏膜上皮细胞结构不完整且数量减少,细胞碎片及空泡增多,细胞固缩明显。与模型组比较,GL各剂量组和阳性对照组上述指标变化均显著逆转(P<0.05),且GL高剂量组上述指标变化均较GL低、中剂量组更显著(P<0.05);大鼠胃黏膜细胞病理变化均改善。结论GL可能通过抑制HMGB1/NF-κB信号通路的激活,抑制炎症和氧化应激反应,从而减轻HP引起的胃黏膜损伤。

BRD7基因调控区的克隆与功能研究

BRD7基因是采用cDNA代表性差异分析法克隆得到的一个新的Bromodomain基因(GenBank登录号AF152604).它在鼻咽癌细胞和组织中表达明显下调,过表达BRD7基因能部分逆转鼻咽癌细胞的恶性表型.为了揭示BRD7基因在鼻咽癌细胞和组织中表达下调的分子机制,利用生物信息学技术已预测出其启动子区.荧光素酶活性检测结果表明该区域具有强启动子活性;转录因子Sp1特异性地结合于BRD7该启动子区;Sp1特异性阻断剂mithramycinA能明显地抑制BRD7启动子的活性和BRD7基因的表达.