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- W2980876814 abstract "Objective: To investigate the relationship between miRNA-196b-5p and miRNA-99a-5p expression and autophagy and apoptosis in multiple myeloma cells. Methods: Human myeloma cell line U266 and normal CD138+ plasma cells were selected as the research objects. The subjects were divided into 45 cases of multiple myeloma patients and 40 healthy controls. The expression of miRNA-196b-5p and miRNA-99a-5p was measured by real-time quantitative PCR, and Western blot was used to determine the expression of autophagy related protein LC3-Ⅱ, LC3-Ⅰ, P62, Beclin-1 expression, apoptosis related protein CL caspase3, CL caspase7, Bcl-2, Bax, and TGF-β/Smad pathway associated proteins TGF-β1, Smad2/3, p-Smad3 and Smad7. The cell apoptosis rate was determined by flow cytometry. The correlation between miRNA expression level and clinical characteristics of multiple myeloma patients was analyzed. Results: Compared with normal plasma cells, the expression of miRNA-196b-5p in myeloma cells increased significantly (0.43±0.15 vs 2.44±0.63 or 2.02±0.85, all P<0.001), the expression of miRNA-99a-5p was significantly decreased (1.87±0.61 vs 0.62±0.15 or 0.80±0.33, P<0.001), LC3-Ⅱ/LC3-Ⅰ increased significantly (P<0.05), Beclin-1 expression increased significantly (P<0.05), P62 expression decreased significantly (P<0.05). The expression of Bax, CL caspase3 and CL caspase7 decreased significantly (P<0.05), and the expression of Bcl-2 increased significantly (P<0.05) and apoptosis rate significantly decreased (P<0.05). After transfected with miRNA-196b-5p mimic or miRNA-99a-5p inhibitor, the LC3-Ⅱ/LC3-Ⅰ of CD138+ plasma cells increased significantly (P<0.05), the expression of Beclin-1 increased significantly (P<0.05), P62 expression decreased significantly (P<0.05), and the apoptosis rate significantly decreased (P<0.05). However, after autophagy inhibitor of 3-MA was administered, the apoptotic rate of the above reaction system did not change significantly (P>0.05). The expression of miRNA-196b-5p and miRNA-99a-5p was significantly correlated with DS and ISS stage in multiple myeloma patients (P<0.05). Conclusion: miRNA-196b-5p and miRNA-99a-5p are closely related to the clinical characteristics of patients with multiple myeloma. The overexpression of miRNA-196b-5p and down regulation of miRNA-99a-5p could inhibit the apoptosis of myeloma cells by up regulation of autophagy, and the mechanism is related to the activation of the TGF-β/Smad signaling pathway.目的: 探讨多发性骨髓瘤(MM)细胞miRNA-196b-5p和miRNA-99a-5p表达与自噬和凋亡的关系。 方法: 以人MM细胞株U266细胞及45例MM患者瘤细胞为研究对象,以40例健康体检者为对照,采用实时定量PCR法测定细胞中miRNA-196b-5p和miRNA-99a-5p表达水平,采用Western blot法测定自噬相关蛋白(LC3-Ⅱ、LC3-Ⅰ、P62、Beclin-1)、凋亡相关分子(CL caspase3、CL caspase7、Bcl-2、Bax)和TGF-β/Smad通路相关蛋白(TGF-β1、Smad2/3、p-Smad3、Smad7)表达水平,采用流式细胞术测定细胞凋亡率,分析miRNA表达水平与MM患者临床特征的相关性。 结果: ①与正常浆细胞比较,U266细胞、MM患者瘤细胞的miRNA-196b-5p表达显著增加(0.43±0.15对2.44±0.63、2.02±0.85,P值均<0.001),miRNA-99a-5p表达显著降低(1.87±0.61对0.62±0.15、0.80±0.33,P值均<0.001),LC3-Ⅱ/LC3-Ⅰ、Beclin-1、Bcl-2表达显著增加,P62、Bax、CL caspase3、CL caspase7表达显著降低,细胞凋亡率降低(P值均<0.05)。②正常CD138(+)浆细胞分别转染miRNA-196b-5p mimic或miRNA-99a-5p inhibitor 48 h后,与未转染对照组比较,LC3-Ⅱ/LC3-Ⅰ、Beclin-1、TGF-β1、p-Smad3表达显著增高,P62、Smad7表达显著降低,细胞凋亡率减少(P值均<0.05);上述反应体系加入自噬抑制剂3-甲基腺嘌呤后,细胞凋亡率未见明显改变(P值均>0.05)。③miRNA-196b-5p和miRNA-99a-5p表达与MM患者DS分期(P值分别为0.004、0.012)、ISS分期显著相关(P值均为0.001)。 结论: miRNA-196b-5p和miRNA-99a-5p表达与MM患者临床特征密切相关,miRNA-196b-5p过表达和miRNA-99a-5p表达下调通过上调自噬水平抑制骨髓瘤细胞凋亡,其机制与活化TGF-β/Smad信号通路有关。." @default.
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- W2980876814 title "[Association of miRNA-196b-5p and miRNA-99a-5p with autophagy and apoptosis in multiple myeloma cells]." @default.
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- W2980876814 doi "https://doi.org/10.3760/cma.j.issn.0253-2727.2018.09.013" @default.
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