Ginsenoside Rb1 Ameliorates Autophagy of Hypoxia Cardiomyocytes from Neonatal Rats via AMP-Activated Protein Kinase Pathway.
10.1007/s11655-018-3018-y
- Author:
Sheng-Nan DAI
1
;
Ai-Jie HOU
1
;
Shu-Mei ZHAO
2
;
Xiao-Ming CHEN
1
;
Hua-Ting HUANG
1
;
Bo-Han CHEN
3
;
Hong-Liang KONG
4
,
5
Author Information
1. Department of Cardiology, the People's Hospital of China Medical University, the People's Hospital of Liaoning Province, Shenyang, 110016, China.
2. International Education College, Shenyang Normal University, Shenyang, 110034, China.
3. Department of Cardiology, the First Affiliated Hospital of Dalian Medical University, Dalian, 116044, China.
4. Department of Cardiology, the People's Hospital of China Medical University, the People's Hospital of Liaoning Province, Shenyang, 110016, China. khl339@
5. com.
- Publication Type:Journal Article
- Keywords:
adenosine 5′-monophosphate-activated protein kinase;
autophagic flux;
cardiomyocytes;
ginsenosides-Rb1;
hypoxia
- From:
Chinese journal of integrative medicine
2019;25(7):521-528
- CountryChina
- Language:English
-
Abstract:
OBJECTIVE:To investigate whether ginsenoside-Rb1 (Gs-Rb1) improves the CoCl-induced autophagy of cardiomyocytes via upregulation of adenosine 5'-monophosphate-activated protein kinase (AMPK) pathway.
METHODS:Ventricles from 1- to 3-day-old Wistar rats were sequentially digested, separated and incubated in Dulbecco's modified Eagle's medium supplemented with 10% fetal bovine serum for 3 days followed by synchronization. Neonatal rat cardiomyocytes were randomly divided into 7 groups: control group (normal level oxygen), hypoxia group (500 μmol/L CoCl), Gs-Rb1 group (200 μmol/L Gs-Rb1 + 500 μmol/L CoCl), Ara A group (500 μmol/L Ara A + 500 μmol/L CoCl), Ara A+ Gs-Rb1 group (500 μmol/L Ara A + 200 μmol/L Gs-Rb1 + 500 μmol/L CoCl), AICAR group [1 mmol/L 5-aminoimidazole-4-carboxamide ribonucleotide (AICAR) + 500 μmol/L CoCl], and AICAR+Gs-Rb1 group (1 mmol/L AICAR + 200 μmol/L Gs-Rb1 + 500 μmol/L CoCl). Cells were treated for 12 h and cell viability was determined by methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay and cardiac troponin I (cTnI) levels were detected by enzyme-linked immunosorbent assay (ELISA). AMPK activity was assessed by 2',7'-dichlorofluorescein diacetate (DCFH-DA) ELISA assay. The protein expressions of Atg4B, Atg5, Atg6, Atg7, microtubule-associated protein 1A/1B-light chain 3 (LC3), P62, and active-cathepsin B were measured by Western blot.
RESULTS:Gs-Rb1 significantly improved the cell viability of hypoxia cardiomyocytes (P<0.01). However, the viability of hypoxia-treated cardiomyocytes was significantly inhibited by Ara A (P<0.01). Gs-Rb1 increased the AMPK activity of hypoxia-treated cardiomyocytes. The AMPK activity of hypoxia-treated cadiomyocytes was inhibited by Ara A (P<0.01) and was not affected by AICAR =0.983). Gs-Rb1 up-regulated Atg4B, Atg5, Beclin-1, Atg7, LC3B II, the LC3B II/I ratio and cathepsin B activity of hypoxia cardiomyocytes (P<0.05), each of these protein levels was significantly enhanced by Ara A (all P<0.01), but was not affected by AICAR (all P>0.05). Gs-Rb1 significantly down-regulated P62 levels of hypoxic cardiomyocytes (P<0.05). The P62 levels of hypoxic cardiomyocytes were inhibited by Ara A (P<0.05) and were not affected by AICAR (P=0.871).
CONCLUSION:Gs-Rb1 may improve the viability of hypoxia cardiomyocytes by ameliorating cell autophagy via the upregulation of AMPK pathway.
