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南京医科大学学报(自然科学版)                                  第42卷第2期
               ·166 ·                     Journal of Nanjing Medical University(Natural Sciences)   2022年2月


             ·基础医学·

              PI3K/Akt调控糖尿病冠状动脉平滑肌细胞BK通道的作用机制



              焦国庆    1,2* ,李明秋 ,吴   莹 ,王如兴 ,胡亚玲 ,纪           丽 ,LU   Tong 3
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              1 无锡市转化医学研究所,南京医科大学附属无锡人民医院心脏外科,江苏                          无锡   214023; Mayo  Clinic细胞电生理研究
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                                  2
              室,美国 明尼苏达州罗切斯特            55905
             [摘    要] 目的:探讨PI3K/Akt对糖尿病冠状动脉平滑肌细胞BK通道的调节作用。方法:采用正常糖浓度(5 mmon/L)、高糖
              浓度(15 mmon/L)、活性氧(reactive oxygen species,ROS)抑制剂GKT137831、PI3K抑制剂Wortmannin作用于人冠状动脉平滑肌
              细胞(human coronary artery smooth muscle cell,HCASMC)。以GKT137831喂饲链脲霉素(streptozocin,STZ)诱导的糖尿病大鼠,
              免疫印迹测定HCASMC、大鼠冠状动脉PI3K超家族DNA⁃Pkcs、Akt、p⁃Akt(S473)及BK⁃α亚基、BK⁃β1亚基的表达,2’,7’⁃二氯
              二氢荧光素二乙酸酯测定HCASMC及大鼠冠状动脉ROS表达。结果:高糖浓度下HCASMC及糖尿病大鼠冠状动脉ROS、DNA
              ⁃Pkcs、Akt、p⁃Akt(S473)表达量增高,BK⁃β1表达量降低(P < 0.05)。GKT137831作用后的HCASMC及糖尿病大鼠冠状动脉中,
              ROS、DNA⁃Pkcs、Akt、p⁃Akt(S473)表达量降低,BK⁃β1 表达量明显增高(P < 0.05)。Wortmannin 作用后的 HCASMC p⁃Akt
             (S473)表达量降低,BK⁃β1表达量明显增加(P < 0.05)。结论:PI3K/Akt通路参与糖尿病冠状动脉平滑肌细胞BK通道的调控。
             [关键词] 糖尿病;大电导钙激活钾通道β1亚基;冠状血管
             [中图分类号] R329.26                   [文献标志码] A                       [文章编号] 1007⁃4368(2022)02⁃166⁃06
              doi:10.7655/NYDXBNS20220203


              PI3K/Akt pathway mediates large conductance calcium ⁃ activated potassium in diabetic

              coronary smooth muscle cells
                          1,2*        2         1             2         1     1       3
              JIAO Guoqing  ,LI Mingqiu ,WU Ying ,WANG Ruxing ,HU Yaling ,JI Li ,LU Tong
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              1 Wuxi Institute of Translational Medicine,Department of Cardiology,Wuxi People’s Hospital Affiliated to Nanjing
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              Medical University,Wuxi 214023,China;Division of Cardiovascular Diseases,Mayo Clinic,Rochester 55905,USA

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             [Abstract] Objective:This study aims to investigate the effect of PI3K/Akt pathway on the regulation of large conductance Ca ⁃
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              activated K channel(BK channel)in diabetic coronary smooth muscle cells. Methods:Human coronary artery smooth muscle cells
             (HCASMC)were incubated with different concentrations of glucose(5 mmol/Land 15 mmol/L),reactive oxygen species(ROS)
              inhibitor GKT137831 and PI3K inhibitor wortmannin. Streptozotocin ⁃ induced diabetic rats were established successfully by
              intraperitoneal injection. Expression of DNA ⁃ Pkcs,Akt,p ⁃ Akt(S473),BK ⁃ α subunit and BK ⁃ β1 subunits were determined by
              Western blot. ROS generation in HCASMC was measured in terms of fluorescence using the cell⁃permeable fluorogenic probe DCFH⁃
              DA. Results:Compared with that of HCASMC incubated in 5 mmon/L glucose concentration,the expression of DNA⁃Pkcs,Akt,p⁃Akt
             (S473)increased significantly and BK⁃β1 subunit decreased significantly(P < 0.05). Compared with the control group,the expression
              of p⁃Akt(s473)decreased significantly(P < 0.05)and BK⁃β1 increased significantly(P < 0.05)after pretreated with Wortmannin.
              Conclusion:PI3K/Akt channel is involved in the regulation of BK channel expression in diabetic coronary smooth muscle cells.
             [Key words] diabetes;large conductance calcium activated potassium channel β1 subunit;coronal vessels
                                                                         [J Nanjing Med Univ,2022,42(02):166⁃170,199]









             [基金项目] 江苏省自然科学基金(BK20171151)
              ∗
              通信作者(Corresponding author),E⁃mail:jiaohaoyang333@163.com
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