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Pioglitazone Induces Cardiomyocyte Apoptosis and Inhibits Cardiomyocyte Hypertrophy Via VEGFR-2 Signaling Pathway.

ABSTRACT: BACKGROUND:Pioglitazone has been widely used as an insulin-sensitizing agent for improving glycemic control in patients with type 2 diabetes mellitus. However, cardiovascular risk and protective effects of pioglitazone remain controversial. OBJECTIVES:In this study, we investigated whether pioglitazone affects cardiomyocyte apoptosis and hypertrophy by regulating the VEGFR-2 signaling pathway. METHODS:Cardiomyocytes were enzymatically isolated from 1- to 3-day-old Sprague-Dawley rat ventricles. Effects of pioglitazone and the VEGFR-2-selective inhibitor apatinib on cardiomyocyte apoptotic rate was determined using flow cytometry, and hypertrophy was evaluated using [3H]-leucine incorporation. The protein expressions of unphosphorylated and phosphorylated VEGFR-2, Akt, P53, and mTOR were determined by Western-Blotting. Analysis of variance (ANOVA) was used to assess the differences between groups. RESULTS:Pioglitazone and VEGFR-2-selective inhibitor apatinib reduced rat cardiomyocyte viability and cardiomyocyte hypertrophy induced by angiotensin II in vitro. Furthermore, in the same in vitro model, pioglitazone and apatinib significantly increased the expression of Bax and phosphorylated P53 and decreased the expression of phosphorylated VEGFR-2, Akt, and mTOR, which promote cardiomyocyte hypertrophy. CONCLUSIONS:These findings indicate that pioglitazone induces cardiomyocyte apoptosis and inhibits cardiomyocyte hypertrophy by modulating the VEGFR-2 signaling pathway.

SUBMITTER: Zhong W

PROVIDER: S-EPMC6122905 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

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Pioglitazone Induces Cardiomyocyte Apoptosis and Inhibits Cardiomyocyte Hypertrophy Via VEGFR-2 Signaling Pathway.

Zhong Wenliang W Jin Wen W Xu Shanghua S Wu Yanqing Y Luo Shunxiang S Liang Minlie M Chen Lianglong L

Arquivos brasileiros de cardiologia 20180702 2

<h4>Background</h4>Pioglitazone has been widely used as an insulin-sensitizing agent for improving glycemic control in patients with type 2 diabetes mellitus. However, cardiovascular risk and protective effects of pioglitazone remain controversial.<h4>Objectives</h4>In this study, we investigated whether pioglitazone affects cardiomyocyte apoptosis and hypertrophy by regulating the VEGFR-2 signaling pathway.<h4>Methods</h4>Cardiomyocytes were enzymatically isolated from 1- to 3-day-old Sprague-D ...[more]

PMID: 29972411

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Project description:Pathological cardiac hypertrophy is an independent risk factor for complications such as arrhythmia, myocardial infarction, sudden mortality and heart failure. Succinate, an intermediate product of the Krebs cycle, is released into the bloodstream by cells; its levels increase with exacerbations of hypertension, myocardial and other tissue damage and metabolic disease. Succinate may also be involved in several metabolic pathways and mediates numerous pathological effects through its receptor, succinate receptor 1 (SUCNR1; previously known as GPR91). Succinate-induced activation of SUCNR1 has been reported to be related to cardiac hypertrophy, making SUCNR1 a potential target for treating cardiac hypertrophy. Traditional Chinese medicine (TCM) and its active ingredients have served important roles in improving cardiac functions and treating heart failure. The present study investigated whether 4'-O-methylbavachadone (MeBavaC), an active ingredient of the herbal remedy Fructus Psoraleae, which is often used in TCM and has protective effect on myocardial injury and hypertrophy induced by adriamycin, ischemia-reperfusion and sepsis, could ameliorate succinate-induced cardiomyocyte hypertrophy by inhibiting the NFATc4 pathway. Using immunofluorescence staining, reverse transcription-quantitative PCR, western blotting and molecular docking analysis, it was determined that succinate activated the calcineurin/NFATc4 and ERK1/2 pathways to promote cardiomyocyte hypertrophy. MeBavaC inhibited cardiomyocyte hypertrophy, nuclear translocation of NFATc4 and ERK1/2 signaling activation in succinate-induced cardiomyocytes. Molecular docking analysis revealed that MeBavaC interacts with SUCNR1 to form a relatively stable binding and inhibits the succinate-SUCNR1 interaction. The results demonstrated that MeBavaC suppressed cardiomyocyte hypertrophy by blocking SUCNR1 receptor activity and inhibiting NFATc4 and ERK1/2 signaling, which will contribute to the preclinical development of this compound.

Dataset Information

Pioglitazone Induces Cardiomyocyte Apoptosis and Inhibits Cardiomyocyte Hypertrophy Via VEGFR-2 Signaling Pathway.

Publications

Pioglitazone Induces Cardiomyocyte Apoptosis and Inhibits Cardiomyocyte Hypertrophy Via VEGFR-2 Signaling Pathway.

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