Related Experiment Video
Updated: Jul 8, 2026
Isolation and Cryopreservation of Neonatal Rat Cardiomyocytes
Published on: April 9, 2015
Tanshinone IIA protects neonatal rat cardiomyocytes from adriamycin-induced apoptosis
Jie Gao1, Guoqing Yang, Rongbiao Pi
1Laboratory of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, People's Republic of China.
Abstract:
Tanshinone IIA (TSN) is a monomer extracted from the Chinese herb Danshen. In this study, we examined the effect of Tanshinone IIA on adriamycin (ADR)-induced apoptosis in neonatal rat cardiomyocytes and underlying molecular mechanisms. Primary cultured cardiomyocytes were treated with 1 micromol/L of adriamycin for 24 h with or without pretreatment with Tanshinone IIA (0.5-2 micromol/L) for 2 h. 3-(4,5-dimethyl thiazol-2yl)-2,5-diphenyltetrazolium bromide (MTT) assay, Hoechst staining, and flow cytometry measurement were used to assess cell viability and apoptosis. Fluorescent probes 2',7'-dichlorofluorescein diacetate and dihydroethidium were used to detect the production of reactive oxygen species. Western blotting was used to evaluate the expression of Bcl-2 and Bax proteins. Adriamycin significantly induced apoptosis in cardiomyocytes. Tanshinone IIA (0.5-2 micromol/L) ameliorated apoptosis induced by adriamycin in a dose-dependent manner. Tanshinone IIA (2 micromol/L) markedly attenuated adriamycin-induced reactive oxygen species production. Western blotting revealed that Tanshinone IIA prevented the adriamycin-mediated reduction of the ratio of Bcl-2/Bax. In conclusion, Tanshinone IIA significantly inhibits adriamycin-induced cardiomyocyte apoptosis in a dose-dependent manner, and this effect is at least partly caused by its antioxidant properties.
Insights
Tanshinone IIA protects heart cells from adriamycin-induced apoptosis by reducing oxidative stress and maintaining Bcl-2/Bax balance. This natural compound offers a potential therapeutic strategy for cardiotoxicity.
Area of Science:
- Cardiology
- Pharmacology
- Molecular Biology
Background:
- Adriamycin (ADR) is a potent chemotherapy agent with known cardiotoxic effects.
- Drug-induced apoptosis in cardiomyocytes is a significant concern in cancer treatment.
- Tanshinone IIA (TSN), derived from Danshen, is investigated for its potential cardioprotective properties.
Purpose of the Study:
- To investigate the protective effects of Tanshinone IIA against adriamycin-induced apoptosis in neonatal rat cardiomyocytes.
- To elucidate the underlying molecular mechanisms, including oxidative stress and apoptosis-related protein expression.
Main Methods:
- Primary cardiomyocyte cultures were exposed to adriamycin with or without Tanshinone IIA pretreatment.
- Cell viability and apoptosis were assessed using MTT assay, Hoechst staining, and flow cytometry.
- Reactive oxygen species (ROS) production and Bcl-2/Bax protein expression were evaluated via fluorescent probes and Western blotting, respectively.
Main Results:
- Adriamycin significantly induced apoptosis in cardiomyocytes.
- Tanshinone IIA demonstrated a dose-dependent amelioration of adriamycin-induced apoptosis.
- Tanshinone IIA (2 micromol/L) attenuated adriamycin-induced ROS production and prevented the decrease in the Bcl-2/Bax ratio.
Conclusions:
- Tanshinone IIA exhibits significant dose-dependent cardioprotective effects against adriamycin-induced apoptosis.
- The cardioprotective mechanism involves the reduction of oxidative stress and modulation of Bcl-2/Bax expression.
- Tanshinone IIA presents a promising therapeutic agent for mitigating adriamycin cardiotoxicity.