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  Block of Kv1.7 potassium currents increases glucose-stimulated insulin secretion.

Finol-Urdaneta, R. K., Remedi, M. S., Raasch, W., Becker, S., Clark, R. B., Struever, N., et al. (2012). Block of Kv1.7 potassium currents increases glucose-stimulated insulin secretion. EMBO Molecular Medicine, 4(5), 424-434. doi:10.1002/emmm.201200218.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-9F59-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-C959-5
Genre: Journal Article

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 Creators:
Finol-Urdaneta, R. K., Author
Remedi, M. S., Author
Raasch, W., Author
Becker, S.1, Author              
Clark, R. B., Author
Struever, N., Author
Pavlov, E., Author
Nichols, C. G., Author
French, R. J., Author
Terlau, H., Author
Affiliations:
1Department of NMR Based Structural Biology, MPI for biophysical chemistry, Max Planck Society, ou_578567              

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Free keywords: Conkunitzin-S1; electrical signalling; GSIS; pancreas; potassium channels
 Abstract: Glucose-stimulated insulin secretion (GSIS) relies on repetitive, electrical spiking activity of the beta cell membrane. Cyclic activation of voltage-gated potassium channels (K v ) generates an outward, ‘delayed rectifier’ potassium current, which drives the repolarizing phase of each spike and modulates insulin release. Although several K v channels are expressed in pancreatic islets, their individual contributions to GSIS remain incompletely understood. We take advantage of a naturally occurring cone-snail peptide toxin, Conkunitzin-S1 (Conk-S1), which selectively blocks K v 1.7 channels to provide an intrinsically limited, finely graded control of total beta cell delayed rectifier current and hence of GSIS. Conk-S1 increases GSIS in isolated rat islets, likely by reducing K v 1.7-mediated delayed rectifier currents in beta cells, which yields increases in action potential firing and cytoplasmic free calcium. In rats, Conk-S1 increases glucose-dependent insulin secretion without decreasing basal glucose. Thus, we conclude that K v 1.7 contributes to the membrane-repolarizing current of beta cells during GSIS and that block of this specific component of beta cell K v current offers a potential strategy for enhancing GSIS with minimal risk of hypoglycaemia during metabolic disorders such as Type 2 diabetes.

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Language(s): eng - English
 Dates: 2012-03-212012-05
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/emmm.201200218
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Title: EMBO Molecular Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 4 (5) Sequence Number: - Start / End Page: 424 - 434 Identifier: -