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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
2
1
1
2
1
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
3
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
2
1 Wuxi Institute of Translational Medicine,Department of Cardiology,Wuxi People’s Hospital Affiliated to Nanjing
3
Medical University,Wuxi 214023,China;Division of Cardiovascular Diseases,Mayo Clinic,Rochester 55905,USA
2 +
[Abstract] Objective:This study aims to investigate the effect of PI3K/Akt pathway on the regulation of large conductance Ca ⁃
+
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)
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通信作者(Corresponding author),E⁃mail:jiaohaoyang333@163.com