The short-term regulation of hepatic acetyl-CoA carboxylase during starvation and re-feeding in the rat.

Munday, M., Milic, M.R., Takhar, S., Holness, M.J. and Sugden, M.C. (1991) The short-term regulation of hepatic acetyl-CoA carboxylase during starvation and re-feeding in the rat. Biochemical Journal, 280 (Pt 3). pp. 733-737.

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Abstract

Rapid inhibition of acetyl-CoA carboxylase (ACC) activity in rat liver in response to 6 h starvation and rapid re-activation in response to 2-6 h of re-feeding chow were shown to be due to changes in the expressed activity of existing enzyme. Decreases and increases in ACC concentration occurred at later stages of the transitions, i.e. 6-48 h starvation and 8-24 h re-feeding respectively. The decrease in expressed activity of ACC was due primarily to changes in its phosphorylation state, demonstrated by a significantly decreased Vmax. and significantly increased Ka for citrate of enzyme purified by avidin-Sepharose chromatography from 6 h- or 48 h-starved rats. These effects were totally reversed within 2-4 h of chow re-feeding. Changes in the activity of purified ACC closely correlated with reciprocal changes in the activity of AMP-activated protein kinase (AMP-PK) over the fed to starved to re-fed transition. Increases in the activity ratio of cyclic-AMP-dependent protein kinase in response to starvation lagged behind the increase in AMP-PK and the decrease in ACC activity. Changes in AMP-PK and ACC activities of rat liver closely correlated with changes in plasma insulin concentration in response to time courses of starvation and re-feeding.

Item Type:Article
Departments, units and centres:Department of Pharmacology > Department of Pharmacology
ID Code:2286
Journal or Publication Title:Biochemical Journal
Deposited By:Library Staff
Deposited On:23 Jun 2011 16:25
Last Modified:23 Jun 2011 16:25

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