Citri Reticulatae Pericarpium protects against isoproterenol-induced chronic heart failure via activation of PPARγ

Huiling Cheng; Xiaodong Wu; Gehui Ni; Siqi Wang; Wenjing Peng; Haifeng Zhang; Juan Gao; Xinli Li

doi:10.21037/atm-20-2200

Citri Reticulatae Pericarpium protects against isoproterenol-induced chronic heart failure via activation of PPARγ

Ann Transl Med. 2020 Nov;8(21):1396. doi: 10.21037/atm-20-2200.

Authors

Huiling Cheng¹, Xiaodong Wu¹, Gehui Ni¹, Siqi Wang², Wenjing Peng², Haifeng Zhang¹, Juan Gao², Xinli Li¹

Affiliations

¹ Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
² Cardiac Regeneration and Ageing Lab, Institute of Cardiovascular Sciences, School of Life Science, Shanghai University, Shanghai, China.

Abstract

Background: Accumulated clinical trials and animal studies showed that Qiliqiangxin (QLQX), a traditional Chinese medicine formula containing extracts of 11 herbs, exerts beneficial effects on chronic heart failure (HF). Citri Reticulatae Pericarpium (CRP), one herbal medicine in QLQX, has been widely used in treatment against digestive, respiratory and cardiovascular diseases (CVDs) in China. However, the cardiac protective effects and mechanisms of CRP are still unclear.

Methods: The effects of CRP were investigated in isoproterenol (ISO)-induced chronic HF mice model and neonatal rat ventricular cardiomyocytes (NRVMs) treated with ISO. Echocardiography was used to determine cardiac function. Hematoxylin-eosin (HE) staining and α-actinin immunofluorescent staining were used to measure cardiomyocyte size. Cardiac fibrosis was evaluated by Masson's trichrome staining. The expression of atrial natriuretic polypeptide (ANP) and brain natriuretic polypeptide (BNP) were determined by quantitative real time PCR (qRT-PCR). Western blot was applied to examine the expression of peroxisome proliferator-activated receptor gamma (PPARγ), PPARγ coactivator-1α (PGC-1α), fibrosis-related and apoptosis-related proteins.

Results: We found that CRP could significantly attenuate ISO-induced cardiac dysfunction, inhibit cardiac pathological hypertrophy and alleviate myocardial fibrosis and apoptosis. Mechanistically, the downregulation of PPARγ and PGC-1α in ISO-injected mice hearts and ISO-treated NRVMs could be reversed by CRP treatment. The beneficial effects of CRP against ISO-induced HF were abolished by PPARγ inhibitor (T0070907), suggesting that CRP-mediated PPARγ upregulation was essential for the preventive effect of CRP on ISO-induced cardiac dysfunction.

Conclusions: In conclusion, our study demonstrated that CRP attenuates ISO-induced cardiac remodeling via PPARγ activation, which represents a new application for CRP in the prevention of chronic HF.

Keywords: Citri Reticulatae Pericarpium (CRP); Heart failure (HF); PPARγ; cardiac remodeling; isoproterenol.