Progesterone Protects Against Bisphenol A-Induced Arrhythmias in Female Rat Cardiac Myocytes via Rapid Signaling.
Bisphenol A (BPA) is an estrogenic endocrine-disrupting chemical (EDC) that has a range of potential adverse health effects. Previously we showed that acute exposure to BPA promoted arrhythmias in female rat hearts through estrogen receptor rapid signaling. Progesterone (P4) and estrogen have antagonistic or complementary actions in a number of tissues and systems. In the current study, we examined the influence and possible protective effect of P4 on the rapid cardiac actions of BPA in female rat cardiac myocytes. Preincubation with physiological concentration (1 nM) of P4 abolished BPA-induced triggered activities in female cardiac myocytes. Further, P4 abrogated BPA-induced alterations in Ca2+ handling, including elevated sarcoplasmic reticulum Ca2+ leak and Ca2+ load. Key to the inhibitory effect of P4 is its blockade of BPA-induced increase in the phosphorylation of phospholamban. At myocyte and protein levels, these inhibitory actions of P4 were blocked by pretreatment with the nuclear P4 receptor (nPR) antagonist RU486. Analysis using membrane-impermeable bovine serum albumin-conjugated P4 suggested that the actions of P4 were mediated by membrane-initiated signaling. Inhibitory G (Gi) protein and phophoinositide-3 kinase (PI3K), but not tyrosine protein kinase activation, were involved in the observed effects of P4. In conclusion, P4 exerts an acute protective effect against BPA-induced arrhythmogenesis in female cardiac myocytes through nPR and the Gi/PI3K signaling pathway. Our findings highlight the importance of considering the impact of EDCs in the context of native hormonals and may provide potential therapeutic strategies for protection against the cardiac toxicities associated with BPA exposure.
Department of Cardiology, Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China.|Department of Pharmacology, University of Cincinnati College of Medicine, Cincinnati, Ohio.
Jianyong
J
Ma
Department of Cardiology, Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China.
Kui
K
Hong
Department of Pharmacology, University of Cincinnati College of Medicine, Cincinnati, Ohio.
Hong-Sheng
HS
Wang
D000818:Animals; D001145:Arrhythmias, Cardiac / Q000139:chemically induced / Q000378:metabolism / Q000517:prevention & control*; D001559:Benzhydryl Compounds; D002118:Calcium / Q000378:metabolism; D052244:Endocrine Disruptors; D005260:Female; D032383:Myocytes, Cardiac / Q000187:drug effects* / Q000378:metabolism; D010636:Phenols; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D011374:Progesterone / Q000494:pharmacology* / Q000627:therapeutic use; D020011:Protective Agents / Q000494:pharmacology* / Q000627:therapeutic use; D051381:Rats; D017207:Rats, Sprague-Dawley; D012519:Sarcoplasmic Reticulum / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects*; D000098826:Bisphenol A Compounds
D001559:Benzhydryl Compounds; D002118:Calcium; D052244:Endocrine Disruptors; D010636:Phenols; D019869:Phosphatidylinositol 3-Kinases; D011374:Progesterone; D020011:Protective Agents; C006780:bisphenol A; D000098826:Bisphenol A Compounds