目的探索酮还原酶家族1成员C3(aldo-keto reductase family 1 member C3,AKR1C3)对乳腺癌恶性细胞生物学行为的干预作用及对程序性细胞死亡蛋白/程序性死亡-配体1(programmed cell death protein1/programmed death-ligand1,PD-1/PD-L)...目的探索酮还原酶家族1成员C3(aldo-keto reductase family 1 member C3,AKR1C3)对乳腺癌恶性细胞生物学行为的干预作用及对程序性细胞死亡蛋白/程序性死亡-配体1(programmed cell death protein1/programmed death-ligand1,PD-1/PD-L)通路的影响。方法把MCF-7人乳腺癌细胞中NC组和AKR1C3组分别转染空质粒和AKR1C3质粒,采用MTT法检测转染后24 h、48 h、72 h细胞活力;采用流式细胞技术测定各组细胞的存活率以及早期、晚期凋亡比例;通过Transwell实验对各组细胞的迁移和侵袭能力进行检测;通过Western blot检测各组细胞PD-1、PD-L1、蛋白激酶B(protein kinase b,AKT)蛋白表达水平。使用C57BL/6小鼠构建荷瘤模型,将采用人乳腺癌MCF-7细胞转染NC质粒和AKR1C3质粒进行细胞荷瘤,每3 d测量瘤体积,持续21 d,绘制两组小鼠肿瘤生长曲线,并于实验终点测量肿瘤质量。结果相较于NC组,AKR1C3组细胞活力降低(P<0.05),并且具有时间依赖效应(P<0.05),迁移和侵袭能力降低(P<0.05),早期凋亡和晚期凋亡比例升高(P<0.05),PD-1、PD-L1、AKT蛋白表达水平降低(P<0.05)。动物实验表明,AKR1C3组小鼠肿瘤体积降低,肿瘤质量下降(P<0.05)。结论AKR1C3可以抑制人乳腺癌细胞恶性生物学行为,抑制PD-1/PDL1信号通路蛋白表达。展开更多
目的:探究卵巢癌(ovarian cancer,OV)浸润性CD4^(+)调节性T细胞(regulatory T cell,Treg)的脂质摄取与积累情况,及其与CD4^(+)Treg中程序性细胞死亡蛋白1(programmed cell death protein 1,PD-1)和细胞毒性T淋巴细胞相关蛋白-4(cytotoxi...目的:探究卵巢癌(ovarian cancer,OV)浸润性CD4^(+)调节性T细胞(regulatory T cell,Treg)的脂质摄取与积累情况,及其与CD4^(+)Treg中程序性细胞死亡蛋白1(programmed cell death protein 1,PD-1)和细胞毒性T淋巴细胞相关蛋白-4(cytotoxic Tlymphocyte associated protein 4,CTLA-4)表达的相关性。方法:采用亲脂性荧光染料BODIPY^(TM)493/503和荧光脂肪酸探针BODIPY^(TM)500/510 C1 C12分别检测OV组织中的或与不同OV细胞系(ES-2、SKOV3、CAOV3)上清液共培养的人源CD4^(+)Treg的细胞内脂质含量和脂质摄取能力;使用脂肪酸氧化抑制剂(Etomoxir)、脂肪酸合成抑制剂(C75)和脂肪酸摄取抑制剂磺基-N-琥珀酰亚胺油酸酯(sulfo-N-succinimidyl oleate,SSO)干预脂质代谢;通过流式细胞术分析CD4^(+)Treg上免疫抑制分子PD-1和CTLA-4的表达。结果:OV组织CD4^(+)Treg相比传统CD4^(+)T细胞表现出更高的脂质含量和脂质摄取能力(P均<0.01)。在体外实验中,与基础培养基相比,OV细胞培养上清可显著提升CD4^(+)Treg的胞内脂质含量与脂质摄取能力(P均<0.05),其中CAOV3来源的上清作用最为显著。此外,CAOV3上清液还能提升CD4^(+)Treg中PD-1与CTLA-4的表达(P<0.05)。CD4^(+)Treg的脂质积累随CAOV3上清浓度增加呈剂量依赖性上升(P<0.05),且其对胞外荧光脂肪酸类似物的摄取能力具有浓度依赖性(P<0.05)。脂肪酸摄取抑制剂SSO可有效逆转CAOV3上清液诱导的CD4^(+)Treg脂质积累及PD-1、CTLA-4的高表达(P<0.05);而脂肪酸氧化抑制剂Etomoxir与合成抑制剂C75则无显著影响。结论:OV微环境通过促进CD4^(+)Treg的脂质摄取,提高细胞内脂质含量,促进其免疫抑制分子PD-1和CTLA-4表达。靶向脂肪酸摄取途径可能是逆转OV中Treg介导的免疫抑制的潜在策略。展开更多
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
文摘目的:探究卵巢癌(ovarian cancer,OV)浸润性CD4^(+)调节性T细胞(regulatory T cell,Treg)的脂质摄取与积累情况,及其与CD4^(+)Treg中程序性细胞死亡蛋白1(programmed cell death protein 1,PD-1)和细胞毒性T淋巴细胞相关蛋白-4(cytotoxic Tlymphocyte associated protein 4,CTLA-4)表达的相关性。方法:采用亲脂性荧光染料BODIPY^(TM)493/503和荧光脂肪酸探针BODIPY^(TM)500/510 C1 C12分别检测OV组织中的或与不同OV细胞系(ES-2、SKOV3、CAOV3)上清液共培养的人源CD4^(+)Treg的细胞内脂质含量和脂质摄取能力;使用脂肪酸氧化抑制剂(Etomoxir)、脂肪酸合成抑制剂(C75)和脂肪酸摄取抑制剂磺基-N-琥珀酰亚胺油酸酯(sulfo-N-succinimidyl oleate,SSO)干预脂质代谢;通过流式细胞术分析CD4^(+)Treg上免疫抑制分子PD-1和CTLA-4的表达。结果:OV组织CD4^(+)Treg相比传统CD4^(+)T细胞表现出更高的脂质含量和脂质摄取能力(P均<0.01)。在体外实验中,与基础培养基相比,OV细胞培养上清可显著提升CD4^(+)Treg的胞内脂质含量与脂质摄取能力(P均<0.05),其中CAOV3来源的上清作用最为显著。此外,CAOV3上清液还能提升CD4^(+)Treg中PD-1与CTLA-4的表达(P<0.05)。CD4^(+)Treg的脂质积累随CAOV3上清浓度增加呈剂量依赖性上升(P<0.05),且其对胞外荧光脂肪酸类似物的摄取能力具有浓度依赖性(P<0.05)。脂肪酸摄取抑制剂SSO可有效逆转CAOV3上清液诱导的CD4^(+)Treg脂质积累及PD-1、CTLA-4的高表达(P<0.05);而脂肪酸氧化抑制剂Etomoxir与合成抑制剂C75则无显著影响。结论:OV微环境通过促进CD4^(+)Treg的脂质摄取,提高细胞内脂质含量,促进其免疫抑制分子PD-1和CTLA-4表达。靶向脂肪酸摄取途径可能是逆转OV中Treg介导的免疫抑制的潜在策略。
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.
