[The Effects of IGHG1 on the Proliferation and Apoptosis of Human Acute Myeloid Leukemia THP-1 Cells].

转染 THP1细胞系 分子生物学 髓系白血病 细胞凋亡 细胞周期 流式细胞术 细胞生长 信号转导 生物 SMAD公司 细胞培养 化学 癌症研究 细胞生物学 生物化学 遗传学
作者
Xin Gao,Li-Jing Chu,Tianping Chen
出处
期刊:PubMed 卷期号:31 (5): 1263-1271
标识
DOI:10.19746/j.cnki.issn.1009-2137.2023.05.002
摘要

To investigate the effects of the immunoglobulin G1 heavy chain constant region (IGHG1) on the proliferation and apoptosis of acute myeloid leukemia (AML) THP-1 cells and its possible mechanism of action.Human AML THP-1 cells were cultured in vitro and divided into control (normally cultured THP-1 cells), pcDNA3.1 [THP-1 cells transfected with IGHG1 overexpression (pcDNA3.1-IGHG1) negative control plasmid], pcDNA3.1-IGHG1 (THP-1 cells transfected with plasmid containing pcDNA3.1-IGHG1), LY364947 [transforming growth factor-β (TGF-β)/signal transduction protein (Smad) inhibitor LY364947 20 μmol/L treated THP-1 cells], si-NC [THP-1 cells transfected with IGHG1-small interfering RNA (siRNA) negative control], si-IGHG1 (THP-1 cells transfected with IGHG1-siRNA), and si-IGHG1+LY364947 (IGHG1-siRNA and LY364947 co-treated THP-1 cells) a total of 7 groups. Fluorescence quantitative PCR was used to detect the expression of IGHG1 and immunoglobulin G (IgG) mRNA of THP-1 cells in each group; CCK-8 was used to detect THP-1 cells proliferation activity; flow cytometry was used to detect THP-1 cells apoptosis and cell cycle in each group; Western blot was used to detect the THP-1 cells proliferation, apoptosis and the expression of TGF-β/Smad signaling pathway related proteins.Compared with the control group, after overexpression of IGHG1, the expression of IGHG1 and IgG mRNA, cell proliferation viability, S phase cell ratio, expressions of Cyclin D1, B cell lymphoma-2 (Bcl-2), IgG, TGF-β1, phosphorylated Smad3 (p-Smad3)/Smad3 protein in THP-1 cells were significantly increased (P<0.05), the apoptosis rate, G0/G1 phase cell ratio, expression of p21, Bcl-2 related X protein (Bax), Caspase-3 protein were significantly reduced (P<0.05); after inhibiting TGF-β/Smad signaling pathway or silencing IGHG1, the expression of IGHG1 and IgG mRNA, cell proliferation viability, S phase cell ratio, expression of Cyclin D1, Bcl-2, IgG, TGF-β1, p-Smad3/Smad3 protein in THP-1 cells were significantly reduced (P<0.05), the apoptosis rate, G0/G1 phase cell ratio, expressions of p21, Bax, and Caspase-3 protein were significantly increased (P<0.05); and compared with silencing IGHG1, after co-treatment of IGHG1 gene silencing and TGF-β/Smad pathway inhibition, the expression of IGHG1 and IgG mRNA, cell proliferation viability, S phase cell ratio, expressions of Cyclin D1, Bcl-2, IgG, TGF-β1, p-Smad3/Smad3 protein in THP-1 cells were significantly reduced (P<0.05), the apoptosis rate, G0/G1 phase cell ratio, expression of p21, Bax, and Caspase-3 protein were significantly increased (P<0.05).Silencing IGHG1 gene can down-regulate the expression of IgG, inhibit the proliferation of human AML THP-1 cells, block cell cycle progression, and induce cell apoptosis; its mechanism may be related to the inhibition of the TGF-β/Smad pathway activation.IGHG1对人急性髓系白血病THP-1细胞增殖、凋亡的影响.探讨免疫球蛋白G1重链恒定区(IGHG1)对急性髓系白血病(AML)细胞系THP-1细胞增殖、凋亡的影响及其可能的作用机制.体外培养人AML THP-1细胞,分为对照(正常培养的THP-1细胞)、pcDNA3.1[转染IGHG1过表达(pcDNA3.1-IGHG1)阴性对照质粒的THP-1细胞]、pcDNA3.1-IGHG1(转染pcDNA3.1-IGHG1的THP-1细胞)、LY364947[转化生长因子-β(TGF-β)/信号转导蛋白(Smad)抑制剂LY364947 20 μmol/L处理THP-1细胞)]、si-NC[转染IGHG1小干扰RNA(IGHG1-siRNA)阴性对照的THP-1细胞]、si-IGHG1(转染IGHG1-siRNA的THP-1细胞)和si-IGHG1+LY364947(IGHG1-siRNA和LY364947共同处理THP-1细胞)共7组。荧光定量PCR法检测各组THP-1细胞中IGHG1和免疫球蛋白G(IgG) mRNA的表达;CCK-8法检测各组THP-1细胞增殖活力;流式细胞术检测各组THP-1细胞凋亡率和细胞周期变化;蛋白印迹法检测各组THP-1细胞增殖、凋亡及TGF-β/Smad信号通路相关蛋白的表达.与对照组相比,过表达IGHG1后THP-1细胞中IGHG1和IgG mRNA表达、细胞增殖活力、S期的细胞比例、细胞周期蛋白D1(Cyclin D1)、B细胞淋巴瘤-2(Bcl-2)、IgG、TGF-β1、磷酸化Smad3(p-Smad3)/Smad3蛋白表达均显著升高(P<0.05),细胞凋亡率、G0/G1期的细胞比例、p21、Bcl-2相关X蛋白(Bax)、半胱氨酸天冬氨酸蛋白酶-3(Caspase-3)蛋白表达均显著降低(P<0.05)。抑制TGF-β/Smad信号通路或沉默IGHG1后THP-1细胞中IGHG1和IgG mRNA表达、细胞增殖活力、S期的细胞比例、Cyclin D1、Bcl-2、IgG、TGF-β1、p-Smad3/Smad3蛋白表达均显著降低(P<0.05),细胞凋亡率、G0/G1期的细胞比例、p21、Bax、Caspase-3蛋白表达均显著升高(P<0.05);且与沉默IGHG1相比,IGHG1基因沉默和TGF-β/Smad通路抑制共同处理的THP-1细胞中IGHG1和IgG mRNA表达、细胞增殖活力、S期的细胞比例、Cyclin D1、Bcl-2、IgG、TGF-β1、p-Smad3/Smad3蛋白表达均显著降低(P<0.05),细胞凋亡率、G0/G1期的细胞比例、p21、Bax、Caspase-3蛋白表达均显著升高(P<0.05).沉默IGHG1基因可下调IgG的表达,抑制人AML THP-1细胞增殖,阻滞细胞周期进程,并诱导细胞凋亡;其作用机制可能与抑制TGF-β/Smad通路的激活有关.
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