Effects of Ala-Gln on Myocardial Fibrosis and Connexin43 Remodeling in Experimental Rats’Model
10.3969/j.issn.1000-3614.2014.12.016
- VernacularTitle:丙氨酰谷氨酰胺对心肌缺血模型大鼠心肌纤维化及缝隙连接蛋白43重构的影响及其机制
- Author:
Honggang BAO
;
Weize ZHANG
;
Tao LI
;
Yongqing CHEN
;
Ling MA
;
Junjie JIA
;
Zhiyong XU
- Publication Type:Journal Article
- Keywords:
Ala-Gln;
Myocardial ifbrosis;
Connexin43;
Extracellular signal-regulated kinase;
Heat shock protein 70
- From:
Chinese Circulation Journal
2014;(12):1024-1028
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To investigate the effects of Ala-Gln induced heat shock protein 70 (HSP70) expression on myocardial ifbrosis and connexin43 (Cx43) remodeling in experimental rats’ model.
Methods: A total of 32 SPF male SD rats were randomly divided into 4 groups:①Control group,②Model group, the rats received isoprenaline (ISO) 5m/(kg·d),③Intervention group, the rats received ISO+Ala-Gln 0.75mg/(kg·d),④Quercetin group, the rats received ISO+quercetin 100mg/(kg·d)+Ala-Gln+DMSO. n=8 in each group. All animals were treated for 7 days and killed in 4 weeks for relevant examinations. HE and Masson staining was conducted to observe myocardial ifbrosis, then calculate collagen volume fraction; immunohistochemistry was applied to measure myocardial HSP70 expression,
extracellular signal regulated kinase (p-ERK1/2) and Cx43 distribution, then conduct semi-quantitative analysis by speciifc soft ware.
Results: HE and Masson staining indicated that Control group had no obvious myocardial ifbrosis, Model group and Quercetin group had obvious ifbrosis, and Intervention group showed less ifbrosis than the other 2 groups, all P<0.01. The fibrosis level was similar between Intervention group and Control group, P>0.05. The myocardial HSP70 expression was similar among Control, Model and Quercetin groups, P>0.05, while HSP70 expression was signiifcantly higher in Intervention group than the other 3 groups, all P<0.01. The myocardial p-ERK1/2 level was lower in Intervention group than Model and Quercetin groups, all P<0.01. The myocardial Cx43 level was similar between Control group and Intervention group with linear distribution, while it was higher in Intervention group than Model and Quercetin groups with disordered distribution, all P<0.01.
Conclusion: Ala-Gln inducing the higher expression of HSP70, which may reduce myocardial ifbrosis in experimental rats, it could be because of HSP70 down regulating p-ERK1/2 expression and inhibiting ERK signaling pathway.
