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Int J Biochem Cell Biol. 2005 Mar;37(3):679-91.

Mitogen-activated protein kinases and selected downstream targets display organ-specific responses in the hibernating ground squirrel.

Author information

1
Department of Biochemistry and Molecular Biology, University of Calgary, 3330 Hospital Drive N.W., Calgary, AB, Canada T2N 4N1.

Abstract

The responses of mitogen-activated protein kinase (MAPK) family members, including the extracellular signal-regulated kinases (ERKs), the c-jun NH2-terminal kinases (JNKs) and p38MAPK, during mammalian hibernation were analyzed in five organs of Richardson's ground squirrels, Spermophilus richardsonii. Each kinase subfamily responded differently in torpor and each showed organ-specific patterns of response. ERK1/2 activities increased significantly in muscle and brain during hibernation but decreased in kidney and liver. JNK activity rose in four organs (except brain) during hibernation whereas active, phosphorylated p38MAPK increased only in muscle and heart. Activities of ERK-activated kinases also responded to hibernation: MAPKAPK-1 rose in muscle and brain, MAPKAPK-2 decreased in liver and kidney but rose in the other three organs, and p70S6K kinase activity decreased kidney and heart. Transcription factors, c-Jun and CREB, also showed organ-specific responses during torpor. The data suggest key roles for MAPKs in the regulation of the known organ-specific changes in gene expression and protein phosphorylation that define the hibernation phenotype.

PMID:
15618024
DOI:
10.1016/j.biocel.2004.05.023
[Indexed for MEDLINE]

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