NDLI: In vivo modulation of rat liver 3-hydroxy-3-methylglutaryl-coenzyme A reductase, reductase kinase, and reductase kinase kinase by mevalonolactone.

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In vivo modulation of rat liver 3-hydroxy-3-methylglutaryl-coenzyme A reductase, reductase kinase, and reductase kinase kinase by mevalonolactone.

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In vivo modulation of rat liver 3-hydroxy-3-methylglutaryl-coenzyme A reductase, reductase kinase, and reductase kinase kinase by mevalonolactone.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Beg, Z. H. Stonik, J. A. Brewer, H. B.
Abstract	It has been previously demonstrated that the enzymic activity of rat liver 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG-CoA reductase; EC 1.1.1.34) is modulated in vitro and in vivo by a bicyclic cascade system involving reversible phosphorylation of HMG-CoA reductase and reductase kinase. In the present study, administration of mevalonolactone to rats caused a rapid inhibition of HMG-CoA reductase activity. The initial short-term (20-min) reversible inhibition (38%) of enzyme activity was due to increased phosphorylation of HMG-CoA reductase. The inhibition of HMG-CoA reductase activity by increased phosphorylation was associated with an increased activity and phosphorylation (2- to 3-fold) of reductase kinase. The increased phosphorylation of reductase kinase was catalyzed by reductase kinase kinase, which was significantly elevated (3- to 4-fold) after the administration of mevalonolactone to rats. The mechanism for the in vivo activation of reductase kinase kinase is as yet unknown. Mevalonolactone administration was also associated with a significant inhibition of phosphoprotein phosphatase activity, which dephosphorylates both HMG-CoA reductase (activation) and reductase kinase (inactivation). These results indicate that mevalonolactone administration to rats in vivo was associated with an inhibition of HMG-CoA reductase activity by two mechanisms: (i) an increase in the degree of phosphorylation of both HMG-CoA reductase and reductase kinase due to increased activity of reductase kinase kinase; (ii) a decrease in the dephosphorylation of both HMG-CoA reductase and reductase kinase secondary to inhibition of phosphoprotein phosphatase activity. These combined effects favor an increase in the steady-state level of the phosphorylated forms of both HMG-CoA reductase and reductase kinase, resulting in a net reduction in the enzymic activity of HMG-CoA reductase and mevalonate formation. These results demonstrate that the activity of reductase kinase kinase is modulated in vivo, providing a mechanism for the regulation of the activities of both reductase kinase and HMG-CoA reductase.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	23
Volume Number	81
Language	English
Publisher	National Academy of Sciences
Publisher Date	1984-01-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Hydroxymethylglutaryl CoA Reductases Metabolism Liver Enzymology Mevalonic Acid Analogs & Derivatives Multienzyme Complexes Protein Kinases Protein-Serine-Threonine Kinases AMP-Activated Protein Kinases Animals Cytosol Isolation & Purification Kinetics Drug Effects Pharmacology Models, Biological Phosphorylation Rats, Inbred Strains Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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