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Basic Res Cardiol. 2021 Mar 22;116(1):21. doi: 10.1007/s00395-021-00861-z.

Connexin 43 phosphorylation by casein kinase 1 is essential for the cardioprotection by ischemic preconditioning.

Basic research in cardiology

Christine Hirschhäuser, Alessio Lissoni, Philipp Maximilian Görge, Paul D Lampe, Jacqueline Heger, Klaus-Dieter Schlüter, Luc Leybaert, Rainer Schulz, Kerstin Boengler

Affiliations

  1. Institut für Physiologie, Justus-Liebig Universität Gießen, Aulweg 129, 35392, Giessen, Germany.
  2. Department of Basic Medical Sciences, Physiology group, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium.
  3. Fred Hutchinson Cancer Research Center, Seattle, WA, USA.
  4. Institut für Physiologie, Justus-Liebig Universität Gießen, Aulweg 129, 35392, Giessen, Germany. [email protected].

PMID: 33751227 PMCID: PMC7985055 DOI: 10.1007/s00395-021-00861-z

Abstract

Myocardial connexin 43 (Cx43) forms gap junctions and hemichannels, and is also present within subsarcolemmal mitochondria. The protein is phosphorylated by several kinases including mitogen-activated protein kinase (MAPK), protein kinase C (PKC), and casein kinase 1 (CK1). A reduction in Cx43 content abrogates myocardial infarct size reduction by ischemic preconditioning (IPC). The present study characterizes the contribution of Cx43 phosphorylation towards mitochondrial function, hemichannel activity, and the cardioprotection by IPC in wild-type (WT) mice and in mice in which Cx43-phosphorylation sites targeted by above kinases are mutated to non-phosphorylatable residues (Cx43

Keywords: Connexin; Hemichannel; Ischemia/reperfusion; Ischemic preconditioning; Mitochondria; Phosphorylation

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