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Multiple kinases regulate mafA expression in the pancreatic beta cell line MIN6.

Author
Abstract
:

MafA is a basic leucine zipper transcription factor expressed within the beta cells of the pancreas and is required to maintain normal glucose homeostasis as it is involved in various aspects of beta cell biology. MafA protein levels are known to increase in response to high glucose through mechanisms that have yet to be fully characterized. We investigated whether discrete intracellular signaling events control mafA expression. We found that the general kinase inhibitor staurosporine induces mafA expression without altering the stability of the protein. Inhibition of the MAP-kinase JNK mimics the effects of staurosporine on the expression of mafA. Calmodulin kinase and calcium signaling are also important in stimulating mafA expression by high glucose. However, staurosporine, JNK, and calmodulin kinase have different effects on the induction of insulin expression. These data reveal that MafA levels are tightly controlled by the coordinated action of multiple kinase pathways.

Year of Publication
:
2008
Journal
:
Archives of biochemistry and biophysics
Volume
:
480
Issue
:
2
Number of Pages
:
138-42
Date Published
:
2008
ISSN Number
:
0003-9861
URL
:
https://linkinghub.elsevier.com/retrieve/pii/S0003-9861(08)00464-5
DOI
:
10.1016/j.abb.2008.10.001
Short Title
:
Arch Biochem Biophys
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