经HIV包膜蛋白gp120刺激的T细胞外泌体促进巨噬细胞M2极化

目的:本研究旨在探讨经HIV膜蛋白gp120处理后人T淋巴细胞系(H9)外泌体对巨噬细胞极化的影响。方法:采用CCK8试剂盒检测gp120处理后人T淋巴细胞H9活力;采用ELISA法检测H9细胞上清液中炎症因子水平;通过电镜和Western blot实验鉴定外泌体特征;PHK67染色观察外泌体进入巨噬细胞情况;最后通过ELISA和免疫荧光检测巨噬细胞极化标记物,分析gp120处理后T细胞外泌体对巨噬细胞极化的影响。结果:HIV gp120蛋白抑制人T淋巴细胞H9增殖并促进炎症因子释放。成功提取人T淋巴细胞H9外泌体,电镜下为中间凹陷的膜结构,高表达标记蛋白CD9、CD63、CD81。PHK67染色结果显示H9细胞外泌体可进入巨噬细胞。经gp120处理的H9细胞外泌体可促进巨噬细胞向M2型极化。结论:HIV膜蛋白gp120处理人T淋巴细胞H9分泌的外泌体能够促进巨噬细胞M2极化,可能是gp120在免疫调节中的新机制。

Extracellular vesicles from T cells stimulated by HIV envelope protein gp120 promote macrophage M2 polarizatio

Objective:To investigate the effects of exosomes from human T lymphocyte line(H9)treated with HIV envelope protein gp120 on macrophage polarization.Methods:The viability of gp120-treated H9 T lymphocytes was as-sessed using the CCK8 assay.Inflammatory cytokine levels in the supernatant of H9 cells were determined by ELISA.Exosome characteristics were identified through electron microscopy and Western blot experiments.PHK67 staining was employed to observe the uptake of exosomes by macrophages.Finally,macrophage polarization markers were detected using ELISA and immuno-fluorescence to analyze the impact of gp120-treated T cell exosomes on macrophage polarization.Results:HIV gp120 protein inhibited the proliferation of human T lymphocytes H9 and promoted the release of inflammatory cytokines.Exosomes from H9 T lymphocytes were successfully isolated,displaying a cup-shaped membranous structure under electron microscopy and overexpressing marker proteins CD9,CD63,and CD81.PHK67 staining results indicated that exosomes from H9 cells could be internalized by macrophages.Exosomes from gp120-treated H9 cells promoted the polarization of macrophages towards the M2 pheno-type.Conclusion:Exosomes secreted by human T lymphocytes H9 treated with HIV envelope protein gp120 can promote M2 polarization of macrophages,suggesting a potential novel mechanism of gp120 in immune modulation.

mir-3168 targeted inhibition of TP53 promotes malignant transformation and cisplatin resistance of AGS and AGS/DDP gastric cancer cells

Objective:To investigate the effect of mir-3168 on the malignant transformation and cisplatin resistance of AGS and AGS/DDP gastric cancer cells,and to verify its target gene.Methods:The expression of mir-3168 in AGS and AGS/DDP gastric cancer cells was detected by qPCR,and mir-3168 mimic,inhibitor and negative control were synthesized.They were transfected into AGS and AGS/DDP gastric cancer cells,respectively.The expression of mir-3168 and TP53 mRNA was detected by qPCR.Cell viability was detected by CCK8 under gradient cisplatin treatment and non treatment,apoptosis was detected by flow cytometry,cell invasion was detected by Transwell,and TP53 protein expression was detected by western blot,The database predicted the binding sites of mir-3168 and TP53.According to the binding sites,the double luciferase experiment was used to verify the binding of mir-3168 and TP53.Results:Compared with cisplatin sensitive gastric cancer cell AGS,mir-3168 was significantly overexpressed in cisplatin resistant gastric cancer cell AGS/DDP;mir-3168 mimic promotes cisplatin resistance,proliferation and invasion of AGS and AGS/DDP gastric cancer cells,and inhibits apoptosis of AGS and AGS/DDP gastric cancer cells;mir-3168 inhibitor inhibits cisplatin resistance,proliferation and invasion of AGS and AGS/DDP gastric cancer cells,and promotes apoptosis of AGS and AGS/DDP gastric cancer cells;mir-3168 mimic inhibits the expression of TP53 mRNA and protein,and mir-3168 inhibitor promotes the expression of TP53 mRNA and protein;Targetscan database predicted that there was a binding point between mir-3168 and TP53,and the double luciferase experiment suggested that mir-3168 was bound to TP53 through the predicted binding site.Conclusion:mir-3168 may promote the malignant transformation of AGS and AGS/DDP gastric cancer cells and cisplatin resistance by targeting TP53.