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目的 观察血小板作用于人骨髓间充质干细胞(mesenchymal stem cells,MSCs)后对肿瘤细胞转移的作用.方法 体外分离培养人骨髓MSCs及健康人外周血中的血小板;实验分为MSCs组、血小板+MSCs组及肿瘤细胞上清处理血小板+MSCs组(T-血小板+ MSCs),分别收集3组培养24 h后的MSCs及培养上清(SGC-7901-CM及MSCs-CM);western blot检测其肿瘤相关成纤维母细胞(CAF)标志蛋白α-SMA及Vimentin的表达;Transwell实验检测骨髓MSCs的迁移能力;流式细胞术检测SGC-7901-CM及MSCs-CM共培养后血小板P选择素的表达水平;建立BALB/c裸鼠尾静脉注射SGC-7901胃癌细胞系转移模型,观察体内肿瘤转移情况.结果 SGC-7901-CM及MSCs-CM处理的血小板P选择素的表达水平[分别为(31.4±1.71)％、(21.37±1.00)％]明显高于对照组[(3.17±0.40)％],差异有统计学意义(t分别为27.85和29.18,P均＜0.01);血小板+MSCs组及T-血小板+MSCs组α-SMA蛋白[分别为(0.79±0.08)、(0.90±0.06)]及Vimentin蛋白[分别为(0.88±0.01)、(0.96±0.04)]的表达水平均明显高于MSCs组[分别为(0.64±0.02)、(0.75±0.05)],差异有统计学意义(t分别为2.96和6.45,4.73和5.73,P均＜0.01);血小板+MSCs组及T-血小板+MSCs组迁移细胞数[分别为(340.3±27.7)个、(424.3±17.6)个]明显高于MSCs组[(220.7±19.4)个],差异有统计学意义(t分别为6.14和13.48,P均＜0.01);体内实验结果表明,血小板+ MSCs组转移灶及T-血小板+MSCs组转移灶[分别为(4±2)个、(21±4)个]明显高于MSCs组[(0.33±0.06)个],差异有统计学意义(t分别为3.051和8.857,P均＜0.01).结论 血小板能促进骨髓MSCs迁移,并能增强骨髓MSCs体内促进肿瘤细胞转移能力.“,”Objective To investigate the effect of human bone marrow mesenchymal stem cells (BM-MSCs) stimulated by platelets in vitro on the metastasis of cancer cells.Methods The BM-MSCs were isolated and cultured in vitro and platelets from the peripheral blood of healthy persons were purified.The MSCs (control),platelets + MSCs,and platelets treated with culture media (CM) of SGC-7901 tumor cells + MSCs (T-platelets + MSCs) were cultured,respectively,and the MSCs and supernatants (MSCs-CM and SGC-7901-CM) were collected,respectively,after 24 hours.The expressions of markers of cancer-associated fibroblasts (CAF),such as α-SMA and Vimentin,were determined by Western-blotting.The immigration ability of BM-MSCs were analyzed by Transwell assay.The levels of P-selectin in platelets stimulated by MSCs-CM or SGC-7901-CM were detected with flow cytometry.The metastasis model of gastric cancer SGC-7901 cells was established in BALB/c nude mice by the injection of tail vein,and the tumor metastasis in vivo was observed.Results The expression levels of P-selectin in platelets stimulated by MSCs-CM ([21.37 ± 1.00] ％) or SGC-7901-CM ([31.4 ± 1.71] ％ were significantly higher than that in the control ([3.17 ± 0.40] ％,t =27.85 and 29.18,P ＜ 0.01).The expression levels of α-SMA and Vimentin in platelets + MSCs group (0.79 ± 0.08 and 0.88 ± 0.01) and T-platelets + MSCs group (0.90 ±0.06 and 0.96 ±0.04) were significantly higher than that in the control (0.64 ±0.02 and 0.75 ±0.05,t =2.96 and 6.45 forα-SMA,t =4.73 and 5.73 for Vimentin,P ＜0.01).The amounts of immigration cells in platelets + MSCs group (340.3 ±27.7) and T-platelets ± MSCs group (424.3 ± 17.6) were significantly higher than that in the control (220.7 ± 19.4,t =6.14 and 13.48,P ＜ 0.01).The in vivo experimental results showed that the metastatic foci in platelets ± MSCs group (4 ± 2) and T-platelets ± MSCs group (21 ± 4) were significantly higher than that in the control (0.33 ± 0.06,t =3.051 and 8.857,P ＜ 0.01).Conclusion Platelets promote the immigration and the enhanced tumor metastasis in vivo of BM-MSCs.