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胡娜, 司超, 张治平, 等. 激活豚鼠耳蜗螺旋动脉平滑肌细胞连接蛋白43下调衰老蛋白P16和P21的表达[J]. 四川大学学报(医学版), 2021, 52(2): 188-193. DOI: 10.12182/20210360504
引用本文: 胡娜, 司超, 张治平, 等. 激活豚鼠耳蜗螺旋动脉平滑肌细胞连接蛋白43下调衰老蛋白P16和P21的表达[J]. 四川大学学报(医学版), 2021, 52(2): 188-193. DOI: 10.12182/20210360504
HU Na, SI Chao, ZHANG Zhi-ping, et al. Down-regulation of the Expression of Senescence Proteins P16 and P21 by Activating Connexin 43 in the Smooth Muscle of Spiral Modiolar Artery of Guinea Pigs[J]. Journal of Sichuan University (Medical Sciences), 2021, 52(2): 188-193. DOI: 10.12182/20210360504
Citation: HU Na, SI Chao, ZHANG Zhi-ping, et al. Down-regulation of the Expression of Senescence Proteins P16 and P21 by Activating Connexin 43 in the Smooth Muscle of Spiral Modiolar Artery of Guinea Pigs[J]. Journal of Sichuan University (Medical Sciences), 2021, 52(2): 188-193. DOI: 10.12182/20210360504

激活豚鼠耳蜗螺旋动脉平滑肌细胞连接蛋白43下调衰老蛋白P16和P21的表达

Down-regulation of the Expression of Senescence Proteins P16 and P21 by Activating Connexin 43 in the Smooth Muscle of Spiral Modiolar Artery of Guinea Pigs

  • 摘要:
      目的  通过D-半乳糖(D-galactose,D-gal)干预制备豚鼠耳蜗螺旋动脉(SMA)平滑肌细胞衰老模型,分析连接蛋白43(Cx43)与衰老相关蛋白P16和P21表达的相关性,探讨Cx43在细胞衰老中可能发挥的作用。
      方法  用贴壁法培养豚鼠SMA平滑肌细胞,应用免疫荧光技术检测平滑肌细胞标记物。实验分对照组、D-gal组和D-gal+缝隙连接激动剂AAP10干预组(AAP10组)。CCK-8检测各组平滑肌细胞活性,确定D-gal干预浓度及时间;qRT-PCR检测各组Cx43 mRNA表达;Western blot检测各组Cx43、P16和P21的蛋白表达量;免疫荧光技术检测各组P16、P21的表达分布情况。
      结果  免疫荧光检测结果显示细胞肌动蛋白(α-SM-actin)阳性表达率达90%以上;CCK-8检测结果显示D-gal最佳干预浓度为30 mg/mL,干预时间为48 h;qRT-PCR检测发现D-gal组平滑肌细胞上Cx43 mRNA水平较对照组降低(P<0.01);AAP10组较D-gal组细胞Cx43 mRNA水平上调(P<0.01);Western blot检测发现D-gal组平滑肌细胞上Cx43蛋白水平较对照组降低(P<0.01);P16和P21蛋白表达较对照组升高(P<0.01);AAP10组较D-gal组细胞Cx43蛋白表达上调(P<0.01),P16、P21蛋白表达下调(P<0.01);免疫荧光结果显示P16和P21主要表达于细胞核上,P16和P21蛋白在D-gal组较对照组细胞荧光强度升高,AAP10组较D-gal组荧光强度下降(P<0.01)。
      结论  上调Cx43的表达可以逆转D-gal诱导的SMA上衰老相关蛋白P16和P21的表达异常。提示Cx43可能参与细胞衰老过程,为延缓细胞衰老提供理论依据和可能的干预靶点。

     

    Abstract:
      Objective  To analyze the correlation between connexin 43 (Cx43) and the expression of P16 and P21, aging-related proteins, and to investigate the possible role of Cx43 in the development of cell senescence with an aging model prepared by D-galactose (D-gal) intervention in the vascular smooth muscle cells (VSMCs) of guinea pig spiral modiolar artery (SMA).
      Methods  The VSMCs of guinea pig SMA were cultured with the adhesion method, and the markers of VSMCs were detected with immunofluorescence technique. The experiment has a control group, a D-gal group, and a group that received D-gal and gap junction agonist AAP10 intervention, hereafter referred to as the AAP10 group. Cell Counting Kit-8 (CCK-8) was used to check VSMC activity and to determine the concentration and duration of D-gal intervention. The mRNA expression of Cx43 in each group was checked with qRT-PCR. The expression of Cx43, P16 and P21 proteins in each group was examined with the Western blot. The expression and distribution of P16 and P21 proteins were examined with immunofluorescence assay.
      Results  Immunofluorescence results showed that the positive expression rate of cell actin (α-SM-actin) was over 90%. CCK-8 results showed that the optimal concentration of D-gal intervention was 30 mg/mL and the intervention duration was 48 h. qRT-PCR test showed that the mRNA expression of Cx43 in VSMCs in the D-gal group was significantly lower than that in the control group (P<0.01), while it is higher in the AAP10 group than that of the D-gal group (P<0.01); Western blot assay showed that the Cx43 expression level in VSMCs in the D-gal group was significantly lower than that in the control group (P<0.01) and the expression of P16 and P21 was significantly higher than that in the control group (P<0.01), the expression of Cx43 protein in AAP10 group was significantly up-regulated compared with that in the D-gal group (P<0.01), while the expression of P16 and P21 was down-regulated significantly (P<0.01); The results of immunofluorescence showed that P16 and P21 were mainly expressed in the cell nucleus. Semi-quantitative analysis of fluorescence intensity showed that the level of P16 and P21 protein in the D-gal group was significantly higher than that in the control group, and the fluorescence intensity of AAP10 group was significantly lower than that in the D-gal group (P<0.01).
      Conclusion  Up-regulation of Cx43 expression can reverse the D-gal-induced abnormal expression of P16 and P21, two aging-related proteins, in SMA. It is suggested that Cx43 on SMA may be involved in D-gal-induced cell senescence, which provides a theoretical basis and possible intervention target for the delay of cell senescence.

     

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