Hypoxia-driven sarcoplasmic/endoplasmic reticulum calcium ATPase 2 (SERCA2) downregulation depends on low-density lipoprotein receptor-related protein 1 (LRP1)-signalling in cardiomyocytes.

2015, J Mol Cell Cardiol. 2015 May 9. pii: S0022-2828(15)00145-5. doi: 10.1016/j.yjmcc.2015.04.028. [Epub ahead of print]
Revuelta-López E1, Cal R1, Herraiz-Martínez A1, de Gonzalo-Calvo D1, Nasarre L1, Roura S2, Gálvez-Montón CC2, Bayes-Genis A2, Badimon L1, Hove-Madsen L1, Llorente-Cortés V3.
Autors del centre relacionats: Badimon Lina, Llorente-Cortés Vicenta, Nasarre Laura, de Gonzalo Calvo David, Hove-Madsen Leif, Revuelta Elena .

1Cardiovascular Research Center, CSIC-ICCC, IIB-Sant Pau, Barcelona, Spain.
2ICREC Research Program, Health Science Research Institute Germans Trias i Pujol, Can Ruti Campus, Badalona, Spain.
3Cardiovascular Research Center, CSIC-ICCC, IIB-Sant Pau, Barcelona, Spain. Electronic address: [email protected].
Abstract
The maintenance of sarcoplasmic reticulum Ca2+ ATPase (SERCA2) activity is crucial for cardiac function and SERCA2 is dramatically reduced in the heart exposed to hypoxic/ischemic conditions. Previous work from our group showed that hypoxia upregulates the phosphorylated form of the Ca2+-dependent nonreceptor protein tyrosine kinase (PTK) proline-rich tyrosine kinase 2 (pPyk2) protein levels in a low-density lipoprotein receptor-related protein (LRP1)-dependent manner. Pyk2 in turn may modulate SERCA2 in cardiomyocytes although this remains controversial. We therefore aimed to investigate the role of LRP1 on hypoxia-induced SERCA2 depletion in cardiomyocytes and to establish LRP1 signalling mechanisms involved. Western blot analysis showed that hypoxia reduced SERCA2 concomitantly with a sustained increase in LRP1 and pPyk2 protein levels in HL-1 cardiomyocytes. By impairing hypoxia-induced Pyk2 phosphorylation and HIF-1α accumulation, LRP1 deficiency prevented SERCA2 depletion and reduction of the sarcoplasmic reticulum calcium content in cardiomyocytes. Moreover, the inhibition of Pyk2 phosphorylation (with the Src-family inhibitor PP2) or the specific silencing of Pyk2 (with siRNA-anti Pyk2) preserved low HIF-1α and high SERCA2 levels in HL-1 cardiomyocytes exposed to hypoxia. We determined that the LRP1/Pyk2 axis represses SERCA2 mRNA expression via HIF-1α since HIF-1α overexpression abolished the protective effect of LRP1 deficiency on SERCA2 depletion. Our findings show a crucial role of LRP1/Pyk2/HIF-1α in hypoxia-induced cardiomyocyte SERCA2 downregulation, a pathophysiological process closely associated with heart failure.
Copyright © 2015. Published by Elsevier Ltd.
KEYWORDS:
Cardiomyocytes; Hypoxia; LRP1; Pyk2; SERCA2
PMID: 25968337 [PubMed - as supplied by publisher]

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