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Molecular cell biology of KATP channels: implications for neonatal diabetes

Published online by Cambridge University Press:  01 August 2007

Andrew J. Smith ,
Tarvinder K. Taneja ,
Jamel Mankouri  and
Asipu Sivaprasadarao
Andrew J. Smith
Affiliation:
Institute of Membrane and Systems Biology, University of Leeds, Leeds, UK.
Tarvinder K. Taneja
Affiliation:
Institute of Membrane and Systems Biology, University of Leeds, Leeds, UK.
Jamel Mankouri
Affiliation:
Institute of Membrane and Systems Biology, University of Leeds, Leeds, UK.
Asipu Sivaprasadarao*
Affiliation:
Institute of Membrane and Systems Biology, University of Leeds, Leeds, UK.
*
*Corresponding author: Asipu Sivaprasadarao, Institute of Membrane and Systems Biology, University of Leeds, Leeds, LS2 9JT, UK. Tel: +44 (0)113 3434 326; Fax: +44 (0)113 3434 228; E-mail: a.sivaprasadarao@leeds.ac.uk
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Abstract

ATP-sensitive potassium (KATP) channels play a key role in the regulation of insulin secretion by coupling glucose metabolism to the electrical activity of pancreatic β-cells. To generate an electric signal of suitable magnitude, the plasma membrane of the β-cell must contain an appropriate number of channels. An inadequate number of channels can lead to congenital hyperinsulinism, whereas an excess of channels can result in the opposite condition, neonatal diabetes. KATP channels are made up of four subunits each of Kir6.2 and the sulphonylurea receptor (SUR1), encoded by the genes KCNJ11 and ABCC8, respectively. Following synthesis, the subunits must assemble into an octameric complex to be able to exit the endoplasmic reticulum and reach the plasma membrane. While this biosynthetic pathway ensures supply of channels to the cell surface, an opposite pathway, involving clathrin-mediated endocytosis, removes channels back into the cell. The balance between these two processes, perhaps in conjunction with endocytic recycling, would dictate the channel density at the cell membrane. In this review, we discuss the molecular signals that contribute to this balance, and how an imbalance could lead to a disease state such as neonatal diabetes.

Type
Review Article
Information
Expert Reviews in Molecular Medicine , Volume 9 , Issue 21 , August 2007 , pp. 1 - 17
Copyright
Copyright © Cambridge University Press 2007

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References

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Further reading, resources and contacts

The Online Mendelian Inheritance in Man database lists human genetic mutations associated with KCNJ11 and ABCC8 and genetic disorders, with references and related links:

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http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=600937 (KCNJ11)Google Scholar
http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=600509 (ABCC8)Google Scholar
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http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=600937 (KCNJ11)Google Scholar
http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=600509 (ABCC8)Google Scholar