Regulation of cardiac Na+-Ca2+ exchanger activity by protein kinase phosphorylation-Still a paradox?

Yin Hua Zhang, Jules C. Hancox

Research output: Contribution to journalReview articlepeer-review

52 Scopus citations

Abstract

The cardiac Na+-Ca2+ exchanger (NCX) is an important regulator of intracellular ion homeostasis and cardiac function. Gaining insight into modulation of the NCX is therefore important in order to understand ion handling in the heart under physiological and pathological conditions. Typically, the functional contribution of the NCX is often regarded as "secondary" to the changes in luminal Na+ and Ca2+. Whilst it is well accepted that the NCX can be regulated by various factors, including the concentrations of transported ions, direct receptor-mediated modulation of the cardiac NCX is more controversial. Evidence from several different laboratories supports the notion that the cardiac NCX is a direct target of neurotransmitters and hormones and their downstream signalling pathways; however, the issue remains unresolved due to conflicting data showing a lack of direct modulation. The present review summarizes overall findings regarding the modulation of the cardiac NCX, in particular on molecular mechanisms of direct phosphorylation of NCX by β-adrenergic/adenylate cyclase/protein kinase A and (for comparative purposes) on endothelin-1/protein kinase C signalling pathways. It also aims to consider whether it is currently possible to reconcile discrepancies between studies in the interpretation of the regulation of the cardiac NCX by agents stimulating the β-adrenoceptor/PKA pathway.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalCell Calcium
Volume45
Issue number1
DOIs
StatePublished - Jan 2009

Keywords

  • Adrenoceptor
  • Cardiac
  • Endothelin-1 (ET-1)
  • Isoprenaline
  • Isoproterenol
  • Na-Ca exchanger (NCX)
  • Phosphorylation
  • Protein kinase A (PKA)
  • Protein kinase C (PKC)
  • Sodium-calcium exchanger
  • Ventricular myocyte

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