An Investigation of the Effects of B7-H4 Gene rs10754339 and miR-125a Gene rs12976445 on Cancer Susceptibility

Objective To investigate the effects of the B7-H4 gene rs10754339 and miR-125a gene rs12976445 on cancer susceptibility through a case-control study and meta-analysis.Methods A total of 1,490 cancer patients(lung/gastric/liver/:550/460/480)and 800 controls were recruited in this case-control study.The meta-analysis was performed by pooling the data from previous related studies and the present study.Results The results of this study showed that in the Hubei Han Chinese population,the rs10754339gene was significantly associated with the risk of lung and gastric cancer but not liver cancer,and the rs12976445 gene was significantly associated with the risk of lung cancer but not liver or gastric cancer.The meta-analysis results indicated that rs10754339 and rs12976445 contributed to cancer susceptibility in the Chinese population and also revealed a significant association between rs10754339and breast cancer risk,as well as between rs12976445 and lung cancer risk.Conclusion The B7-H4 gene rs10754339 and miR-125a gene rs12976445 may be the potential genetic markers for cancer susceptibility in the Chinese population,which should be validated in future studies with larger sample sizes in other ethnic populations.

Anti-gastric cancer active immunity induced by FasL/B7-1 gene-modified tumor cells

AIM: To study the activation of cytotoxic T lymphocytes (CTLs) against gastric cancer cells induced by FasL/B7-1 (FB-11) gene-modified tumor cells, and to explore whether co-expression of FasL and B7-1 in SGC-7901 tumor cells could initiate synergistic antitumor effect. METHODS: FasL and B7-1 genes were transfected into human SGC-7901 gastric cancer cells with adenovirus vectors. The positive clones were selected by G418. FasL and B7-1 genes were detected by flow cytometry and RT-PCR. Abdominal infiltrating lymphocytes and sensitized spleen cells were obtained from mice that were immunized with SGC-7901/FB-11 or wild type SGC-7901 cells intraperitoneally, and cytotoxicity of these CTLs against tumor cells was determined by MTT assay. RESULTS: Flow cytometry and RT-PCR showed that FasL and B7-1 genes were highly expressed. FasL and B7-1 transfected cancer cells had a high apoptosis index. DNA laddering suggested that FasL and B7-1 genes induced gastric cancer cell apoptosis. FasL+/B7-1+SGC-7901 cells (SGC-7901/FB-11) were inoculated subcutaneously in the dorsal skin of C57BL/6 mice and then decreased their tumorigenicity greatly (z = 2.15-46.10, P＜0.01). SGC- 7901/FB-11 cell-sensitized mice obtained protective immune activity against the rechallenge of wild type SGC 7901 cells (z = 2.06-44.30, P＜0.05). The cytotoxicity of CTLs induced by SGC-7901/FB-11 cells against SGC-7901 was significantly higher than that of CTLs activated by wild-type SGC-7901 cells (84.1±2.4% vs30.5±2.3%,P＜0.05).CONCLUSION: FasL and B7-1 genes can effectively promote the activity of CTLs against gastric cancer cells. FasL/B7-1 molecules play an important role in CTL cytotoxicity.

Construction of Eukaryotic Expression Vector Containing B7-1/GFP Gene and Its Expression in Osteosarcoma Cell Line

Objective： To construct eukaryotic expression vector containing B7-1/GFP geneand study its expression in osteosarcoma cell line LM8. Methods： By using gene cloning technique, eukaxyotic expression vector pEGFP-C1 was used to construct the murine B7-1 recombinant plasmid （pEGFP-C1/B7）. Recombinant plasmid was transfected into LM8 cells with liposome and was confirmed by restriction endonuclease digestion and DNA sequencing. The expression of the fusion protein was detected using fluorescence microscope and Western blot analysis. Results： The recombinant eukaryotic expression plasmid pEGFP-C1/B7 was successfully constructed, which was confirmed by DNA sequencing, RT-PGR and restriction enzymes analysis. The green fluorescent protein could be detected in the transfected LM8 with fluorescence microscope. The expected B7-1 and green fluorescent protein （GFP） fusion protein was detected by RT-PCR and Western blot. Conclusion： The eukaryotic expression vector containing B7-1/GFP gene was constructed successfully, and it could be expressed in LM8 after transfection.

STUDY OF ENHANCED IMMUNOGENECITY OF B7-1 GENE TRANSFECTED HUMAN HELA CELL LINE

This work was supposed by CMB (No. 96—635) This is one of papers of the special issue on gene therapy research (Chin J Cancer Res Vol. 9 No. 4 December, 1997). Although cervical carcinoma cells may express the human papillomavirus protein E6 and E7, they fail to induce an effective specific cytotoxic T lymphocyte response. Recent studies suggest that expression of CD 80 (B7 1) on tumor cells is effective to induce antitumor immune responses. 1,2 In our study, CD 80 gene was transfected into human Hela cell line with a CD 80 expression plasmid (B7 1 +pcDNA 3) by electroporation, then the immunogenecity of the modified Hela cell was tested in TLMC (tumor lymphocyte mixed culture) system. Thymidine lymphocyte proliferation assays showed that the response of human peripheral blood lymphocytes (PBLS) to CD 80 positive Hela cells demonstrated a substantial increase in cell proliferation compared to the response to control cells. Cocultivation of allogeneic PBLs with CD 80 positive tumor cells for three days can induce an increased secretion of IL 2. Our results demonstrate an immunostimulatory effect of CD 80 expression on cervical cancer cells, which provides a basis for the development of a therapeutic tumor vaccine.

Experimental Study on the Antitumor Effect of Mouse B7-1 Gene

Summary: Mouse B7 1 cDNA was cloned by RT PCR from BALB/C mouse splenic cells and inserted into pcDNA3 to construct an eukaryotic expression vector. This constructor was named pCD mB7 1, in which the B7 1 cDNA was identified to be consistent with the data from other researchers. pCD mB7 1 plasmid was transfected into B16(F0) cells, and effective expression of mB7 1 in these tumor cells could be detected till the 6th month by RT PCR and RNA hybridization. Specific cytotoxity assay of lymphocytes was conducted after culturing with tumor cells and the results demonstrated that B16 cells transfected with B7 1 gene were more effective than B16 wt and B16 neo in inducing specific cytotoxity of lymphocytes against B16 wt cells. It is suggested that expression of B7 1 gene in tumor cells could enhance the immunogenicity and induce the effective antitumor immunity.

Expression of the novel gene NM23-H1B in ovarian cancer

Objective:To study the expression of the human novel gene NM23-H1B in ovarian cancer. Methods: Totally 24 samples from patients with epithelial ovarian tumor at different clinical stages and 4 from normal ovaries were examined for NM23-H1B mRNA expression by RT-PCR and Northern blot. Results: All samples expressed NM23-H1B mRNA through RT-PCR, while the level of expression in ovarian tumor was higher than that of normal ovary. The results of Northern blot showed that NM23-H1B was overexpressed in ovarian cancer while lowexpressed in normal ovary or low malignant potential (LMP). The level of expression at early stage cancer(stageⅠand Ⅱ) was higher than those in advanced cancer(stage Ⅲ and Ⅳ). In early stage carcinoma, the expression level was involved in the differentiation of tumor cell, and well-differentiated cancer expressed NM23-H1B mRNA in comparatively higher level. Conclusion: The novel gene NM23-N1B is closely correlated with the ovarian cancer.

GM-CSF GENE OR B7-1 GENE MODIFIED MURINE EL-4 CELLS VACCINE

Objective: To study the vaccine potency of gene-modified tumor cells. Methods: The EL-4 lymphoma was transduced with recombinant retrovirus containing the murine GM-CSF gene or B7-1 gene. The effect of gene transduction on antitumor immunity was investigated. Results: Flow cytometry analysis showed that expression of their surface marker between wild-type EL-4 cells and gene transduced tumor cells was the same except for CD80 positive in B7-1 gene transduced cells. GM-CSF gene or B7-1 gene transduced EL-4 cells resulted in remarkable loss of tumorigenicity in syngenetic mice. The systemic protective immunity was induced against the challenge with EL-4/wt cells. Therapeutic vaccine with EL-4/GM-CSF or EL/7-1 cells could retard the growth of established early-stage EL-4/wt tumor significantly, but not retard the growth of late-stage EL-4/wt tumor. Irradiated GM-CSF gene transduced EL-4 cells showed strong vaccine effect against EL-4 cell challenge, but irradiated B7-1 gene transduced EL-4 cells showed weak vaccine effect. Remarkable cooperative antitumor effect against EL-4 cell challenge was observed when both irradiated EL-4/GM-CSF and EL-4/B7-1 were inoculated together. Conclusion: GM-CSF gene or B7-1 gene transduced BL-4 cells can be used as a good tumor vaccine. The combination of the two kinds of vaccine may have potential application value in human cancer treatment.

Costimulatory Molecule B7-H1 on the Immune Escape of Bladder Cancer and Its Clinical Significance

B7-H1, a recently described member of the B7 family of costimulatory molecules, is thought to be involved in tumor immune escape by inducing T-cell apoptosis. In order to investigate the relationship between B7-H1 and immune escape of bladder cancer, B7-H1 expression in 50 cases of bladder cancer was detected by using immunohistochemical method. Survival curves were con- structed using the Kaplan-Meier method and independent prognostic factors were evaluated using the Cox regression model. Our results showed that the positive rate of B7-H1 immunostaining in normal bladder tissue and bladder cancer was 0 and 72% respectively. The expression of B7-H1 was strongly associated with the pathological grade, clinical stage and recurrence （P〈0.05）. The survival rate was significantly lower in patients with B7-H1 positive group than in those with B7-H1 negative group and multi-variable analysis revealed that B7-H1 could be regarded as an independent factor in evaluating the prognosis of bladder cancer. It is concluded that the expression of B7-H1 is strongly associated with neoplastic progression and prognosis of bladder cancer. The manipulation of B7-H1 may become a beneficial target for immunotherapy in human bladder cancer.

IFNγ and B7-H1 in the immunology of mesenchymal stem cells

Mesenchymal stem cells （MSCs） are found in multiple organs in the fetus, cord blood and adult tissues . However, in adults, the bone marrow is the major source of these stem cells. MSCs surround the blood vessels of bone marrow and are also in contact with the trabeculae . The immunology of MSCs is relevant to medicine. In bone marrow, MSCs could be considered ‘gate-keeper＇ cells. This designation is mostly due to its location in the abluminal surface of the main sinus, which forms the interface between the periphery and marrow cavity . Cells or organisms entering or exiting the marrow need to by-pass MSCs. The immune properties of MSCs suggest that these stem cells are not bystander cells, but perhaps, they are actively involved in homeostasis of bone marrow.

Effect of miR-513a-5p on Etoposide-stimulating B7-H1 Expression in Retinoblastoma Cells

This study investigated the effect of etoposide,an anticancer chemotherapy drug,on B7-H1 expression in retinoblastoma(Rb) cells and the role of miR-513a-5p in the process.Rb cells were divided into control and etoposide groups.In the etoposide group,cells were treated with etoposide at different concentrations(2.5,5,10,20 and 40 μg/mL) for 24 h.Those given no treatment of etopside served as controls.Reverse transcription polymerase chain reaction(RT-PCR),fluorescence quantitative PCR and flow cytometry were performed to measure the mRNA and protein expression of B7-H1 in Rb cells.The mRNA expression of miR-513a-5p in Rb cells before and after etoposide treatment was also detected by fluorescence quantitative PCR.The miR-513a-5p mimics and the miR-513a-5p inhibitor were transfected into Rb cells separately,and fluorescence quantitative PCR and flow cytometry were used to detect the effect of the miR-513a-5p mimics or inhibitor on B7-H1 expression.TargetScan5.2 was employed to predict the miR-513a-5p binding sites in the 3’-untranslated region of B7-H1 mRNA.Luciferase reporter plasmids carrying this site were prepared and transfected into Rb cells and luciferase activity analyzed.The results showed that etoposide stimulated the mRNA and protein expression of B7-H1 in Rb cells,which reached a maximal level after treatment with 5 μg/mL etoposide(P<0.05).However,miR-513a-5p expression was decreased in Rb cells after etoposide treatment.When the miR-513a-5p inhibitor was added,B7-H1 expression was increased with the concentration of the miR-513a-5p inhibitor(P<0.05).Moreover,B7-H1 expression was decreased gradually with the concentration of the miR-513a-5p mimics increased(P<0.01).Additionally,the miR-513a-5p mimics were found to inhibit the luciferase activity.It was concluded that etoposide can promote B7-H1 expression in Rb cells,which may be associated with chemoresistance.The promoting effect of etoposide on B7-H1 expression can be reversed by miR-513a-5p mimics.MiR-513a-5p inhibits the mRNA and protein expression of B7-H1 via binding to the 3’-UTR of B7-H1 mRNA.

Expression and significance of B7-H1 in peripheral blood dendritic cells from patients with bladder cancer

Objective： The aim of this study was to study the expression and the clinical significance of B7-H1 on dendritic cells （DCs） in peripheral blood from patients with bladder cancer. Methods： Peripheral blood mononuclear cell were disparted from 30 bladder cancer patients and 7 healthy controls by density gradient centfifugation and then co-cultured. The expres- sion of B7-H1 on DCs were analyzed by flow cytometry. Results： Expression of BT-H1 on DCs in bladder cancer was higher than healthy controls （P 〈 0.01）. And the expression were strongly associated with the pathological grade and clinical stage of bladder cancer （P 〈 0,05）. Conclusion： The up-regulation of B7-H1 on DCs was strongly associated with neoplastic progres-sion of bladder cancer. B7-H1/programmed death （PD）-1 signal pathway may also play an important role in immune escape of bladder cancer during initial phase of T cell immune response.

早期胃癌患者血清TK1、STAT1、sB7-H4水平变化及对内镜黏膜下剥离术预后的预测价值

目的 探究早期胃癌患者血清胸苷激酶1(TK1)、信号转导和转录活化因子1(STAT1)、可溶性B7-H4(sB7-H4)水平变化,并分析其对内镜黏膜下剥离术(ESD)预后的预测价值。方法 前瞻性选取2019年1月至2022年7月郑州大学第一附属医院300例接受ESD手术的早期胃癌患者,检测围手术期(术前、术后3 d、术后7 d)血清TK1、STAT1、sB7-H4水平,术后接受为期1 a随访,根据有无复发分为复发组(22例)与未复发组(278例)。比较两组患者的临床资料及血清TK1、STAT1、sB7-H4水平。评价血清TK1、STAT1、B7-H4水平预测早期胃癌患者ESD术后复发的价值。结果 所有患者术后7 d血清TK1、sB7-H4水平<术后3 d<术前(P<0.05),所有患者术后7 d血清STAT1水平>术后3 d>术前(P<0.05)。复发组术后3、7 d的血清TK1、sB7-H4水平均高于未复发组,STAT1水平均低于未复发组(P<0.05)。术后3、7 d血清TK1、sB7-H4、STAT1联合预测复发的曲线下面积(AUC)分别为0.901、0.944,均大于各时间点三项血清指标单独预测,且术后7 d预测价值更高,此时最佳敏感度、特异度分别为90.91%、86.33%。结论 血清TK1、sB7-H4、STAT1水平变化与早期胃癌患者ESD术后复发密切相关,且在临床早期预测患者术后复发方面具有较高预测效能。

复方斑蝥胶囊联合紫杉醇、卡铂治疗晚期非小细胞肺癌疗效观察及对血清NRP-1、B7-H3水平的影响

目的:观察复方斑蝥胶囊联合紫杉醇、卡铂治疗晚期非小细胞肺癌的临床疗效及对血清神经纤毛蛋白1 (NRP-1)、B7-H3水平的影响。方法:选取80例晚期非小细胞肺癌患者,按照随机数字表法分为对照组和研究组各40例。对照组给予紫杉醇加卡铂化疗方案,研究组在对照组基础上加用复方斑蝥胶囊治疗。比较2组临床疗效,简易智能精神状态检查量表(MMSE)、日常生活能力量表(ADL)评分,CD3^(+)、CD4^(+)和自然杀伤(NK)细胞以及血清NRP-1、B7-H3水平。结果:研究组总有效率为75.00%,对照组为40.00%,2组比较,差异有统计学意义(P<0.05)。治疗后,2组MMSE、ADL评分均较治疗前升高(P<0.05),且研究组2项评分均高于对照组(P<0.05)。治疗后,2组CD4^(+)、NK细胞水平均较治疗前升高(P<0.05),CD8^(+)水平较治疗前降低(P<0.05);且研究组CD4^(+)、NK细胞水平高于对照组(P<0.05),CD8^(+)水平低于对照组(P<0.05)。治疗后,2组血清NRP-1、B7-H3水平均较治疗前降低(P<0.05),且研究组2项水平均低于对照组(P<0.05)。结论:复方斑蝥胶囊联合紫杉醇加卡铂化疗治疗晚期非小细胞肺癌疗效显著,可有效改善患者免疫功能,下调血清NRP-1、B7-H3水平,提高患者认知功能与生活能力。

复发性口腔溃疡患者血清CCL19、sB7-H3、sPD-1水平变化及其对复发的预测价值

目的探究复发性口腔溃疡(ROU)患者血清趋化因子配体19(CCL19)、可溶性共刺激分子B7-H3(sB7-H3)、可溶性程序性死亡蛋白1(sPD-1)水平变化及其对复发的预测价值。方法选取2021年4月至2022年4月该院收治的ROU患者320例为ROU组,同期在该院体检无口腔疾病的健康志愿者320例为对照组,采用酶联免疫吸附试验(ELISA)检测血清中CCL19、sB7-H3、sPD-1水平。采用Pearson法分析ROU患者血清中CCL19、sB7-H3、sPD-1水平与白细胞介素-6(IL-6)、白细胞介素-10(IL-10)、肿瘤坏死因子-α(TNF-α)水平的相关性。采用受试者工作特征(ROC)曲线分析ROU患者血清中CCL19、sB7-H3、sPD-1水平对复发的预测价值。结果与对照组相比,ROU组血清中CCL19、sPD-1水平显著升高,sB7-H3水平显著降低(P<0.05)。ROU组血清IL-6、IL-10、TNF-α水平均显著高于对照组(P<0.05)。相关性分析结果显示,ROU患者血清中CCL19、sPD-1水平与IL-6、IL-10、TNF-α水平呈正相关,sB7-H3水平与IL-6、IL-10、TNF-α水平呈负相关(P<0.05)。与未复发组相比,复发组血清中CCL19、sPD-1水平显著升高,sB7-H3水平显著降低(P<0.05)。血清CCL19、sB7-H3、sPD-1三者联合预测ROU患者复发的曲线下面积(AUC)高于各指标单独预测(Z_(CCL19-三者联合)=3.294,P=0.001;Z_(sB7-H3-三者联合)=4.348,P<0.001;Z_(sPD-1-三者联合)=4.990,P<0.001)。结论ROU患者血清中CCL19、sPD-1呈高表达,sB7-H3呈低表达,三者对预测ROU患者的复发有一定的价值。

早期胃癌组织中TK1、STAT1、B7-H4水平变化与ESD手术预后的相关性分析

目的:探究早期胃癌组织中细胞质胸苷激酶(TK1)、信号传导及转录激活因子1(STAT1)、B7-H4表达情况及与内镜黏膜下剥离术(ESD)手术预后的相关性。方法:选取2017年1月—2019年1月我院120例行ESD治疗的早期胃癌患者,术中均取癌组织和癌旁正常组织(距癌旁>5cm)标本。采用免疫组化法检测癌组织、癌旁正常组织TK1、STAT1、B7-H4表达情况,并比较不同临床特征患者癌组织TK1、STAT1、B7-H4表达情况,分析癌组织TK1、STAT1、B7-H4表达情况与早期胃癌临床特征的关系。ESD术后随访1年,统计术后1年复发/转移情况,比较复发/转移与未复发/转移患者癌组织TK1、STAT1、B7-H4表达情况,通过交互作用分析癌组织TK1、STAT1、B7-H4表达情况对早期胃癌ESD术后复发/转移的作用,并分析其预测早期胃癌ESD术后复发/转移的价值。结果:早期胃癌患者癌组织中TK1、B7-H4阳性率均高于癌旁正常组织,STAT1阳性率低于癌旁正常组织(P<0.05)。不同肿瘤大小、分化程度、浸润深度患者癌组织TK1、STAT1、B7-H4阳性率比较,差异有统计学意义(P<0.05)。癌组织TK1、B7-H4阳性率与早期胃癌肿瘤大小、浸润深度呈正相关,与分化程度呈负相关(P<0.05);STAT1阳性率与早期胃癌肿瘤大小、浸润深度呈负相关,与分化程度呈正相关(P<0.05)。复发/转移患者癌组织TK1阳性率、B7-H4阳性率高于未复发/转移患者,STAT1阳性率低于未复发/转移患者(P<0.05)。在早期胃癌ESD术后复发/转移中癌组织TK1阳性与STAT1阴性、TK1阳性与B7-H4阳性、STAT1阴性与B7-H4阳性呈正向交互作用(P<0.05)。癌组织TK1、STAT1、B7-H4阳性单独预测早期胃癌ESD术后复发/转移的曲线下面积(AUC)分别为0.879、0.702、0.750,联合预测的AUC最大,为0.914,预测敏感度、特异度分别为94.44%、88.42%。结论:早期胃癌患者癌组织中TK1、B7-H4表达明显升高,STAT1表达降低,在预测ESD术后复发/转移方面具有较高预测效能。

负性共刺激分子B7-H1和B7-H4在结直肠癌中的表达及其临床意义

目的:检测结直肠癌组织中负性共刺激分子B7-H1和B7-H4的表达、T细胞亚群的浸润情况,探讨其临床意义。方法:收集苏州大学附属第四医院2003年1月至2003年12月50例结直肠癌患者的癌组织标本以及5例患者的癌旁组织标本,免疫组织化学法检测结直肠癌组织中B7-H1和B7-H4的表达以及T细胞亚群的浸润,分析B7-H1、B7-H4的表达与结直肠癌患者临床病理特征及T细胞浸润的相关性,分析B7-H1、B7-H4的表达和CD3+T、CD8+T淋巴细胞浸润程度与患者预后的相关性。结果:结直肠癌组织高表达B7-H1(44%)和B7-H4(56%),而癌旁组织不表达(P<0.01)。B7-H1在结肠癌组织中的表达较直肠癌显著升高(P<0.05);随着Duke’s分期的升高,B7-H4的表达水平也呈上升趋势(P<0.05)。结直肠癌组织中B7-H1的表达与CD3+T细胞浸润呈负相关(P<0.05),但与B7-H4的表达无关。B7-H1的表达水平与患者预后呈负相关(P<0.05),且B7-H1和B7-H4同时高表达的患者总体生存率显著降低(P<0.05)。结论:负性共刺激分子B7-H1和B7-H4在人结直肠癌组织中高表达,并与患者总体生存率相关,两者的共同检测对结直肠癌诊断和预后判断具有一定的临床价值。

共刺激分子B7-H1、B7-H3和B7-H4在血液系统恶性肿瘤细胞株中的表达水平和分布特征

目的:探讨3种共刺激分子B7-H1、B7-H3和B7-H4在人类血液系统恶性肿瘤细胞株中的表达及分布特征。方法:分别采用RT-PCR、q PCR、Western blot和流式细胞术检测13株血液肿瘤细胞中B7-H1、B7-H3和B7-H4的表达及亚细胞定位情况,设12例志愿者外周血单个核细胞(PB MNC)为对照。结果:3种共刺激分子的mRNA在12例志愿者PB MNC和13株血液肿瘤细胞中广泛表达,其中B7-H4表达水平相对偏低;3种共刺激分子分别在Maver、Z138和HL-60中表达最高,B7-H3和B7-H4在CZ1中不表达。3种共刺激分子的胞核及胞浆蛋白仅在恶性血液肿瘤细胞中异常高表达,分别在U937、Z138和Raji细胞中表达最高,B7-H3和B7-H4在CZ1细胞中不表达。在同一肿瘤来源的细胞株中,3种共刺激分子的mRNA和胞核及胞浆蛋白表达均存在差异,且差异不全一致。B7-H3膜蛋白在U937、M aver和Z138中表达丰度较高;B7-H1和B7-H4的膜蛋白在13株细胞中呈不表达或低表达。结论:共刺激分子B7-H1、B7-H3和B7-H4在mRNA水平均广泛表达,但蛋白水平仅在血液肿瘤细胞中异常高表达,且亚细胞定位多在胞核及胞浆,膜蛋白水平普遍低表达或不表达。同一肿瘤来源的细胞株中3种共刺激分子的表达可存在差异。

负性协同刺激分子B7-H1和B7-H3在乳腺癌组织中的表达及其临床意义

目的:探讨负性协同刺激分子B7-H1、B7-H3在乳腺癌组织中的表达及其与患者临床病理参数、预后及CD3+T淋巴细胞浸润程度的相关性。方法:选取2003年3月至2004年1月在苏州大学附属第三医院乳腺外科接受手术治疗的女性乳腺癌患者49例(均经病理诊断确认为浸润性导管癌)的乳腺癌组织标本,免疫组织化学方法检测乳腺癌组织中协同刺激分子B7-H1、B7-H3的表达以及CD3+T淋巴细胞浸润程度。结果:(1)乳腺癌组织中B7-H1阳性表达率为53.06%(26/49),其表达水平与肿瘤大小呈正相关(P<0.05)、与Her2/neu表达水平呈正相关(P<0.05)、与CD3+T淋巴细胞浸润程度呈负相关(P<0.05);(2)乳腺癌组织中B7-H3阳性表达率为59.18%(29/49),其表达水平与病理分期呈正相关(P<0.05)、与患者预后呈负相关(P<0.05);(3)乳腺癌组织中B7-H1和B7-H3的表达水平呈正相关(r=0.3316,P<0.05)。结论:负性协同刺激分子B7-H1和B7-H3在乳腺癌中的表达水平与临床病理因素及预后密切相关,对该两分子的检测在乳腺癌诊断和预后判断中具有潜在的临床应用价值。

结直肠癌组织中B7-H1和B7-H4表达与Foxp3^+调节性T细胞浸润的关联性

目的:探讨B7-H1和B7-H4在结直肠癌(CRC)组织中的表达及其与肿瘤中Foxp3^+调节性T细胞(Treg)浸润的关系,为判定CRC的生物学行为及预后提供依据。方法:免疫组织化学法检测56例CRC患者肿瘤标本及癌旁正常组织样本中B7-H1、B7-H4蛋白的表达和Treg的浸润情况,并与CRC患者的临床病理特征进行关联性分析。结果:CRC患者CRC组织中B7-H1阳性表达率高于癌旁正常组织(χ~2=72.34,P<0.01)。不同浸润深度的CRC组织中B7-H1表达频数比较差异有统计学意义(P<0.01);淋巴结转移阳性者CRC组织中B7-H1高表达频数高于淋巴结转移阴性者(P<0.01);Duke’s分期C+D者CRC组织中B7-H1高表达频数高于Duke’s分期A+B者(P<0.01)。CRC组织中B7-H4阳性表达率高于癌旁正常组织(χ~2=78.92,P<0.01)。不同浸润深度的CRC组织中B7-H4高表达频数比较差异有统计学意义(P<0.05),淋巴结转移阳性者CRC组织中B7-H4高表达频数高于淋巴结转移阴性者(P<0.05);肿瘤组织中Treg阳性细胞数明显高于癌旁正常组织(P<0.01);分化程度不同CRC组织中Treg阳性细胞数比较差异有统计学意义(P<0.01);淋巴结转移阳性者CRC组织中Treg阳性细胞数高于淋巴结转移阴性者(P<0.01)。Treg浸润与B7-H1的表达有相关性(P<0.01,Cramer’s=0.463),Treg浸润与B7-H4的表达有相关性(P<0.05,Cramer’s=0.320)。结论:B7-H1和B7-H4在CRC组织中呈异常高表达,并与肿瘤中Treg浸润增加有关,可作为评估CRC预后的指标。

过表达或抑制肿瘤相关巨噬细胞B7-H1基因对卵巢癌增殖侵袭的机制研究

目的:探讨过表达或抑制肿瘤相关巨噬细胞(TAM)B7-H1基因对卵巢癌增殖侵袭的影响及机制。方法:在体外刺激人单核THP-1细胞成为巨噬细胞,并诱导为TAM,通过腺病毒载体系统过表达(Ad-B7-H1)或抑制(Ad-si B7-H1)TAM中的B7-H1基因,通过Western blot检测转染后的TAM中的B7-H1表达;单独培养(Alone组)与过表达(si B7-H1-TAM组)或抑制(B7-H1-TAM组)B7-H1基因的TAM共培养后,CCK8法检测CAOV3细胞的活力。Transwell小室检测细胞的迁移能力;Western blot检测Ki67、基质金属蛋白酶2(MMP-2)、基质金属蛋白酶9(MMP-9)、磷酸化的蛋白酪氨酸激酶2(p-JAK2)、磷酸化的信号转导与转录因子3(p-STAT3)。结果:Ad-si B7-H1组B7-H1的表达显著低于对照组,Ad-B7-H1组B7-H1的表达显著高于对照组(P<0.05);与单独培养组比较,TAM组细胞活力、细胞侵袭能力及Ki67、MMP-2、MMP-9、p-JAK2和p-STAT3的蛋白表达均显著升高(P<0.05),与RFP-TAM组比较,si B7-H1-TAM组的细胞活力、细胞侵袭能力及Ki67、MMP-2、MMP-9、pJAK2和p-STAT3的蛋白表达均显著降低,B7-H1-TAM组的细胞活力、细胞侵袭能力及Ki67、MMP-2、MMP-9、p-JAK2和pSTAT3的蛋白表达均显著升高(P<0.05)。结论:抑制肿瘤相关巨噬细胞B7-H1基因可抑制卵巢癌细胞活力及侵袭能力,下调JAK2/STAT3信号通路,过表达B7-H1基因反之。