以往的研究主要集中在肿瘤细胞在免疫逃逸中的变化,而对肿瘤微环境(tumor microenvironment, TME)对免疫逃逸的影响知之甚少。肿瘤相关成纤维细胞(tumor-associated fibroblasts, TAFs)是TME的重要组成部分,具有特殊的生理生化特性,但...以往的研究主要集中在肿瘤细胞在免疫逃逸中的变化,而对肿瘤微环境(tumor microenvironment, TME)对免疫逃逸的影响知之甚少。肿瘤相关成纤维细胞(tumor-associated fibroblasts, TAFs)是TME的重要组成部分,具有特殊的生理生化特性,但其具体机制尚不清楚。为了研究TAF对胃癌细胞PD-L1表达的影响,通过transwell将胃癌细胞株MNK45、SGC7901与TAFs非接触共培养1、3、7 d。采用qRT-PCR和流式细胞仪检测PD-L1 mRNA和蛋白表达。然后选择95例胃癌组织,通过免疫组化检测PD-L1和TAFs的表达。结果显示,实验组PD-L1 mRNA和蛋白表达量均显著高于对照组。胃癌中PD-L1的表达与大量淋巴细胞浸润、弥漫性/混合性组织学和瘤内TAFs有关。综上所述,TAFs通过提高PD-L1的表达促进胃癌细胞株的生长。Previous studies have focused on the changes of tumour cells in immune escape, and less is known about the effect of the tumour microenvironment (TME) on immune escape. Tumour-associated fibroblasts (TAFs) cells are an important part of the TME and have special physiological and biochemical characteristics, but the specific mechanism has not been clarified. In order to investigate the effect of TAFs on the expression of PD-L1 in gastric cancer cells, gastric cancer cell lines MNK45, SGC7901 were non-contact coculturing with TAFs 1, 3 and 7 d via transwell. PD-L1 mRNA and protein expression were detected using qRT-PCR and FCM. Then, 95 cases of gastric cancer tissues were selected and PD-L1 and TAFs expressions were determined by immunohistochemical examination. The results showed that the mRNA and protein expression of PD-L1 in the experiment group were significantly higher than that in the control group. PD-L1 expression was associated with massive lymphocyte infiltration, diffuse/mixed histology and intratumoral TAFs in gastric cancers. In conclusion, TAFs promoted the growth of gastric cancer cell lines by increasing the PD-L1 expression.展开更多
目的评价阿帕替尼联合程序性死亡受体1/程序性死亡受体配体1(PD-1/PD-L1)抑制剂治疗恶性实体瘤的有效性与安全性。方法检索PubMed、Web of Science、Embase、Cochrane Library、中国知网、维普网、万方数据、中国生物医学文献数据库,收...目的评价阿帕替尼联合程序性死亡受体1/程序性死亡受体配体1(PD-1/PD-L1)抑制剂治疗恶性实体瘤的有效性与安全性。方法检索PubMed、Web of Science、Embase、Cochrane Library、中国知网、维普网、万方数据、中国生物医学文献数据库,收集阿帕替尼联合PD-1/PD-L1抑制剂和(或)化疗/其他疗法(联合组)对比阿帕替尼或PD-1/PD-L1抑制剂单药和(或)化疗/其他疗法(对照组)治疗恶性实体瘤的随机对照研究(RCT),检索时限为建库至2025年5月。筛选文献、提取资料、评价文献质量后,采用RevMan 5.3和Stata 14.0软件进行Meta分析。结果共纳入28篇RCTs,包括2974例患者。联合组患者的客观缓解率[RR=1.639,95%CI(1.452,1.851),P<0.00001],疾病控制率[RR=1.284,95%CI(1.178,1.399),P<0.00001],CD3^(+)、CD4^(+)、CD4^(+)/CD8^(+)以及高血压、疲劳乏力、蛋白尿、血小板减少等不良反应的发生率均显著高于对照组(P<0.05或P<0.00001);疾病进展率[RR=0.497,95%CI(0.437,0.566),P<0.00001]、血清肿瘤标志物水平、CD8^(+)均显著低于对照组(P<0.05或P<0.00001)。不同类型肿瘤的亚组分析结果显示,联合组患者的客观缓解率和疾病控制率均显著高于对照组(P<0.05)。敏感性分析结果显示,本研究结果的稳定性良好。发表偏倚分析结果显示,本研究存在发表偏倚的可能性较大。结论阿帕替尼联合PD-1/PD-L1抑制剂治疗不同类型肿瘤的疗效显著,但需注意高血压、疲劳乏力、蛋白尿、血小板减少的发生。展开更多
文摘以往的研究主要集中在肿瘤细胞在免疫逃逸中的变化,而对肿瘤微环境(tumor microenvironment, TME)对免疫逃逸的影响知之甚少。肿瘤相关成纤维细胞(tumor-associated fibroblasts, TAFs)是TME的重要组成部分,具有特殊的生理生化特性,但其具体机制尚不清楚。为了研究TAF对胃癌细胞PD-L1表达的影响,通过transwell将胃癌细胞株MNK45、SGC7901与TAFs非接触共培养1、3、7 d。采用qRT-PCR和流式细胞仪检测PD-L1 mRNA和蛋白表达。然后选择95例胃癌组织,通过免疫组化检测PD-L1和TAFs的表达。结果显示,实验组PD-L1 mRNA和蛋白表达量均显著高于对照组。胃癌中PD-L1的表达与大量淋巴细胞浸润、弥漫性/混合性组织学和瘤内TAFs有关。综上所述,TAFs通过提高PD-L1的表达促进胃癌细胞株的生长。Previous studies have focused on the changes of tumour cells in immune escape, and less is known about the effect of the tumour microenvironment (TME) on immune escape. Tumour-associated fibroblasts (TAFs) cells are an important part of the TME and have special physiological and biochemical characteristics, but the specific mechanism has not been clarified. In order to investigate the effect of TAFs on the expression of PD-L1 in gastric cancer cells, gastric cancer cell lines MNK45, SGC7901 were non-contact coculturing with TAFs 1, 3 and 7 d via transwell. PD-L1 mRNA and protein expression were detected using qRT-PCR and FCM. Then, 95 cases of gastric cancer tissues were selected and PD-L1 and TAFs expressions were determined by immunohistochemical examination. The results showed that the mRNA and protein expression of PD-L1 in the experiment group were significantly higher than that in the control group. PD-L1 expression was associated with massive lymphocyte infiltration, diffuse/mixed histology and intratumoral TAFs in gastric cancers. In conclusion, TAFs promoted the growth of gastric cancer cell lines by increasing the PD-L1 expression.
