Document Detail


The effects of insulin and glucose on the induction and intracellular translocation of delta-aminolevulinic acid synthase.
MedLine Citation:
PMID:  6380416     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The administration of insulin and glucose to young Sprague-Dawley rats (125-150 g) resulted in changes in the intracellular distribution and in the turnover rates of delta-aminolevulinic acid synthase (ALAS) activity in the mitochondria and the cytosol. When starved, allylisopropylacetamide (AIA)-induced rats were injected with either insulin or glucose, the percentage of the total ALAS activity found in the cytosol increased from 27% in control animals to 33-40% in insulin-treated and 50% in glucose-treated rats. Similar increases of the ALAS activity in the cytosol were observed after insulin treatment of noninduced, starved animals. Glucose administration also repressed 25-40% of the AIA induction of ALAS as previously reported; however, this effect apparently was not a result of elevated insulin levels, since there was no observed repression of AIA induction after insulin administration. The effects of insulin and glucose on the turnover rates of ALAS activity in the mitochondria and in the cytosol were investigated by observing changes in the half-lives of ALAS activity in the two intracellular compartments. Administration of both insulin and glucose resulted in an increased half-life of ALAS activity in the cytosol from 20.8 to over 100 min, while the mitochondrial half-life was not significantly changed. When insulin was given to either fed, AIA-induced or to starved, noninduced rats, the half-life of the cytosolic ALAS increased from about 14 to 40 min. In contrast to the starved, induced animals, the mitochondrial ALAS half-life in starved, noninduced animals decreased 50%. These results suggest that insulin and glucose treatment may inhibit the translocation of ALAS from the cytosol into the mitochondrial matrix.
Authors:
R J DeLoskey; D S Beattie
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Archives of biochemistry and biophysics     Volume:  233     ISSN:  0003-9861     ISO Abbreviation:  Arch. Biochem. Biophys.     Publication Date:  1984 Aug 
Date Detail:
Created Date:  1984-09-07     Completed Date:  1984-09-07     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0372430     Medline TA:  Arch Biochem Biophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  64-71     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
5-Aminolevulinate Synthetase / biosynthesis*,  metabolism
Animals
Biological Transport
Cytosol / enzymology
Enzyme Induction
Fasting
Glucose / pharmacology*
Insulin / pharmacology*
Kinetics
Liver / drug effects,  enzymology*
Male
Mitochondria, Liver / enzymology
Rats
Rats, Inbred Strains
Grant Support
ID/Acronym/Agency:
AG-00099/AG/NIA NIH HHS
Chemical
Reg. No./Substance:
11061-68-0/Insulin; 50-99-7/Glucose; EC 2.3.1.37/5-Aminolevulinate Synthetase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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