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Nils Wierup

Nils Wierup

Senior lecturer

Nils Wierup

Evidence for Presence and Functional Effects of Kv1.1 Channels in beta-Cells: General Survey and Results from mceph/mceph Mice

Author

  • Zuheng Ma
  • Catharina Lavebratt
  • Malin Almgren
  • Neil Portwood
  • Lars E. Forsberg
  • Robert Branstrom
  • Erik Berglund
  • Sture Falkmer
  • Frank Sundler
  • Nils Wierup
  • Anneli Bjorklund

Summary, in English

Background: Voltage-dependent K+ channels (Kv) mediate repolarisation of beta-cell action potentials, and thereby abrogate insulin secretion. The role of the Kv1.1 K+ channel in this process is however unclear. We tested for presence of Kv1.1 in different species and tested for a functional role of Kv1.1 by assessing pancreatic islet function in BALB/cByJ (wild-type) and megencephaly (mceph/mceph) mice, the latter having a deletion in the Kv1.1 gene. Methodology/Principal Findings: Kv1.1 expression was detected in islets from wild-type mice, SD rats and humans, and expression of truncated Kv1.1 was detected in mceph/mceph islets. Full-length Kv1.1 protein was present in islets from wildtype mice, but, as expected, not in those from mceph/mceph mice. Kv1.1 expression was localized to the beta-cell population and also to alpha-and delta-cells, with evidence of over-expression of truncated Kv1.1 in mceph/mceph islets. Blood glucose, insulin content, and islet morphology were normal in mceph/mceph mice, but glucose-induced insulin release from batch-incubated islets was (moderately) higher than that from wild-type islets. Reciprocal blocking of Kv1.1 by dendrotoxin-K increased insulin secretion from wild-type but not mceph/mceph islets. Glucose-induced action potential duration, as well as firing frequency, was increased in mceph/mceph mouse beta-cells. This duration effect on action potential in beta-cells from mceph/mceph mice was mimicked by dendrotoxin-K in beta-cells from wild-type mice. Observations concerning the effects of both the mceph mutation, and of dendrotoxin-K, on glucose-induced insulin release were confirmed in pancreatic islets from Kv1.1 null mice. Conclusion/Significance: Kv1.1 channels are expressed in the beta-cells of several species, and these channels can influence glucose-stimulated insulin release.

Department/s

  • Department of Experimental Medical Science
  • EXODIAB: Excellence of Diabetes Research in Sweden

Publishing year

2011

Language

English

Publication/Series

PLoS ONE

Volume

6

Issue

4

Document type

Journal article

Publisher

Public Library of Science

Topic

  • Cell and Molecular Biology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1932-6203