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Ginsenoside Rb1 attenuates cardiomyocyte apoptosis induced by myocardial ischemia reperfusion injury through mTOR signal pathway.
- Source :
-
Biomedicine & Pharmacotherapy . May2020, Vol. 125, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Ginsenoside Rb1 (GRb1) is known to play an effective protection on myocardial infarction, yet its therapeutic mechanism on myocardial ischemia/reperfusion (I/R) injury has remained obscure. Here we sought to investigate the protective mechanism of GRb1 preconditioning on myocardial I/R injury in rats. We report here that GRb1 preconditioning could improve myocardial I/R injury induced-cardiac functions including LVDP, -dp/dt min and + dp/dt max; however, the heart rate (HR) was maintained at a level comparable to the I/R group. Additionally, in I/R injury group given GRb1 preconditioning, release of myocardial enzymes (CK-MB and Trop l) and CtsB was decreased. Moreover, GRb1 decreased the expression of apoptotic related proteins e.g. cleaved-caspase 3; however, the ratio of Bcl-2/Bax related to anti-apoptosis was decreased. The study was extended by injecting rapamycin intraperitoneally before GRb1 pretreatment. Thus, mTOR pathway was significantly upregulated after GRb1 pretreatment when compared with I/R. Remarkably, the anti-apoptosis protection of GRb1 pretreatment was attenuated by rapamycin. Furthermore, GRb1 effectively reduced the infarct size thus supporting its role in anti-myocardial I/R injury. It is concluded that GRb1 preconditioning can ameliorate myocardial I/R injury as manifested by the improvement of cardiac function indices; moreover, release of myocardial enzymes, namely, CK-MB, Trop l and CtsB was reduced. More importantly, we have shown that the protective effect of GRb1 against I/R injury induced cardiomyocyte apoptosis is associated with the activation of mTOR signal pathway as evident by the use of rapamycin. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07533322
- Volume :
- 125
- Database :
- Academic Search Index
- Journal :
- Biomedicine & Pharmacotherapy
- Publication Type :
- Academic Journal
- Accession number :
- 142207233
- Full Text :
- https://doi.org/10.1016/j.biopha.2020.109913