Pre‑treatment with a combination of Shenmai and Danshen injection protects cardiomyocytes against hypoxia/reoxygenation‑ and H2O2‑induced injury by inhibiting mitochondrial permeability transition pore opening

Li,Lin; Sha,Zhengmei; Wang,Yanyan; Yang,Dongli; Li,Jinghao; Duan,Zhenzhen; Wang,Hongbo; Li,Yuhong

doi:10.3892/etm.2019.7462

Pre‑treatment with a combination of Shenmai and Danshen injection protects cardiomyocytes against hypoxia/reoxygenation‑ and H2O2‑induced injury by inhibiting mitochondrial permeability transition pore opening

Authors:
- Lin Li
- Zhengmei Sha
- Yanyan Wang
- Dongli Yang
- Jinghao Li
- Zhenzhen Duan
- Hongbo Wang
- Yuhong Li
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Affiliations: Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, P.R. China, Institute of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, P.R. China
Published online on: April 2, 2019 https://doi.org/10.3892/etm.2019.7462
Pages: 4643-4652

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Abstract

Increasing evidence has indicated that opening of the mitochondrial permeability transition pore (mPTP) has a vital role in myocardial ischemia/reperfusion (I/R) injury. Shenmai injection (SMI) plus Danshen injection (DSI) combination, termed Yiqi Yangyin Huoxue (YYH) therapy is used in the clinic to treat cardiovascular diseases, including myocardial I/R injury. Previous studies by our group have demonstrated the protective effect of pretreatment with YYH against myocardial I/R injury in isolated rat hearts. The present study aimed to examine the protective effect of YYH against hypoxia/reoxygenation (H/R)‑ and H2O2‑induced cardiomyocyte injury, and to determine whether this effect is produced by inhibition of mPTP opening. Primary cardiomyocytes isolated from neonatal rats were cultured and randomly grouped into a control group, injury group and pretreatment group, with six duplicated wells in each group during each assay. Cardiomyocytes in the injury group were subjected to H/R to simulate I/R or exposed to H2O2 for 2 h to induce oxidative injury. Cellular injury was assessed via release of creatine kinase (CK) and lactate dehydrogenase (LDH), and cell viability was measured by an MTT assay. The mitochondrial membrane potential (ΔΨm) and cytosolic reactive oxygen species (ROS) were detected using the fluorescent probes rhodamine123 (Rh123) and chloromethyl‑2,7‑dichlorodihydrofluorescein diacetate (CM‑H2DCFDA), respectively. Intracellular Ca2+, mitochondrial Ca2+ and mPTP opening were measured using fluo‑4 acetoxymethyl (Fluo‑4/AM), rhodamine‑2 acetoxymethyl (Rhod‑2/AM) and calcein acetoxymethyl (Calcein/AM) probes, respectively. The results indicated that pretreatment with YYH enhanced cell viability, increased ΔΨm, reduced CK and LDH release, and decreased intracellular ROS and Ca2+, thus reducing cardiomyocyte injury induced by H/R or H2O2. LY294002, a specific phosphoinositide 3‑kinase (PI3K) inhibitor, and PD98059, a specific inhibitor of the extracellular signal‑regulated kinase 1/2 (Erk1/2) pathway, eliminated the protective effects of the combination therapy on cell viability and the change in the ΔΨm in cardiomyocytes. In conclusion, pre‑treatment with YYH has cardioprotective effects against H/R injury and oxidative stress via activation of the PI3K/Akt and Erk1/2 signaling pathways, which reduces mPTP opening, overproduction of ROS and calcium overload.

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