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Pharmacological evidence for altered src kinase regulation of I Ca,L in patients with chronic atrial fibrillation

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Abstract

A reduction in l-type Ca2+ current (I Ca,L) contributes to electrical remodeling in chronic atrial fibrillation (AF). Whether the decrease in I Ca,L is solely due to a reduction in channel proteins remains controversial. Protein tyrosine kinases (PTK) have been described as potent modulators of I Ca,L in cardiomyocytes. We studied α1C l-type Ca2+ channel subunit expression and the regulation of I Ca,L by PTK in chronic AF using PTK inhibitors: genistein, a nonselective inhibitor of PTK, and 4-amino-5-(4-methylphenyl)-7-(t-butyl)pyrazolo-3,4-d-pyrimidine (PP1), a selective inhibitor of src kinases. Furthermore, type-1 and type-2A protein phosphatase activity was measured with phosphorylase as substrate in whole-cell lysates derived from atrial tissue of AF patients. Right atrial appendages were obtained from patients undergoing open-heart surgery. Protein levels of α1C l-type Ca2+ channel subunit were determined using Western blot analysis and normalized to the protein amounts of calsequestrin as internal control. The protein concentrations of α1C did not differ between AF and sinus rhythm (SR; α1C/calsequestrin: 1.0 ± 0.1 and 1.2 ± 0.2, respectively, n = 8 patients). In cardiomyocytes from patients in SR (n = 20 patients), genistein and PP1 both evoked similar increases in I Ca,L from 3.0 ± 0.3 to 6.1 ± 0.8 pA/pF and from 2.8 ± 0.4 to 6.1 ± 0.6 pA/pF, respectively. In cells from AF patients (n = 10 patients), basal I Ca,L was significantly lower. In this case, genistein lead to the same relative increase in I Ca,L as in SR cells (from 1.46 ± 0.30 to 3.2 ± 1.0 pA/pF), whereas no increase was elicited by PP1 suggesting impaired regulation of I Ca,L by src kinases in AF. Total and type 1 and type 2A-related phosphatase activities were higher in tissue from patients with chronic AF compared to SR (4.8 ± 0.4, 2.1 ± 0.2, and 2.7 ± 0.4 nmol/mg/min and 3.6 ± 0.4, 1.3 ± 0.2, and 2.4 ± 0.3 nmol/mg/min, respectively, n = 7 patients per group). Downregulation of I Ca,L in AF is not due to a reduction in l-type Ca2+ channel protein expression. Indirect evidence for an impaired src kinase regulation of I Ca,L together with an increased phosphatase activity suggests that a complex alteration in the kinase/phosphatase balance leads to I Ca,L dysregulation in chronic AF.

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Acknowledgments

These studies were supported by the German Federal Ministry of Education and Research (BMBF) through the Atrial Fibrillation Competence NETwork (AFNET, projects C4 and C5 to DD and US, respectively; grant 01Gi0204) and the Dutch Heart Foundation (grant 2002 B040 to US). The authors thank Manja Schöne and Annett Opitz for excellent technical assistance.

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  1. Maura Greiser

    Present address: Department of Physiology, Maastricht University, Postbus 616, 6200 MD, Maastricht, The Netherlands

Authors and Affiliations

  1. Institut für Physiologie, Universitätsklinikum Aachen, Aachen, Germany

    Maura Greiser, Maura Greiser, Christian R. Halaszovich & Andreas Lückhoff

  2. Medizinische Klinik I, Universitätsklinikum Aachen, Aachen, Germany

    Dirk Frechen

  3. Institut für Pharmakologie, Technische Universität Dresden, Dresden, Germany

    Ursula Ravens & Dobromir Dobrev

  4. Institut für Pharmakologie, Westfälische Wilhelms-Universität Münster, Munster, Germany

    Peter Boknik

  5. Department of Physiology, Maastricht University, Maastricht, The Netherlands

    Ulrich Schotten

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  1. Maura Greiser
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Correspondence to Maura Greiser.

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Greiser, M., Halaszovich, C.R., Frechen, D. et al. Pharmacological evidence for altered src kinase regulation of I Ca,L in patients with chronic atrial fibrillation. Naunyn-Schmied Arch Pharmacol 375, 383–392 (2007). https://doi.org/10.1007/s00210-007-0174-6

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  • DOI: https://doi.org/10.1007/s00210-007-0174-6

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