Changes and significance of transient receptor potential melastatin 7 after myocardial infarction in the mouse
- VernacularTitle:瞬时受体电位通道亚族M7样电流在小鼠心肌梗死后的变化及意义
- Author:
Yongming ZHOU
;
Mingjiang LI
;
Tianyi QIU
;
Yanhong TANG
;
Congxi HUANG
- Publication Type:Journal Article
- Keywords:
TRPM cation channels;
Fibroblasts;
Myocardial infarction;
SiRNA
- From:
Chinese Journal of Geriatrics
2008;27(12):927-930
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the changes of TRPM 7-like current in mouse cardiac fibroblast(CFs) after myocardial infarction and the effect of myocardial ischemia on the TRPM 7 expression and current. Methods (1) The model of myocardial infarction was made and CFs were isolated;(2) CFs were cultured and infected by TRPM 7 siRNA;(3) The effects of myocardial ischemia on TRPM 7 current were recorded by whole cell patch clamp technique;(4) The influences of myocardial isehemia on Ca2+ influx in CFs were recorded by Ca2+ fluorescence imaging. (5) The effects of ischemia on total collagen content of CFs were studied. Results (1) Ca2+ inward current of CFs was increased after myocardial infarction [(16.2±1.7) vs. (7.4±0.7) pA/pF, P<0.053];(2) TRPM 7 current was reduced by 90% after siRNA infection;(3) The total collagen content of CFs after ischemia was approximately 2.3-fold higher than basic value. Conclusions Ca2+ influx in CFs plays an important role in the pathophysiological process of myocardial fibrosis.
