| Uncoupling activity of endogenous free fatty acids in rat liver mitochondria. | |
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MedLine Citation:
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PMID: 630455 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Changes in the respiratory control index (RCI) and ADP:O ratio were found to be related to alterations in the free fatty acids levels of rat liver mitochondria aging in 0.25 M sucrose- Tris buffer at 0 degrees C. Free fatty acid levels increased with time after isolation of mitochondria while a concomitant decrease in the RCI and ADP:O ratio occurred. The changes in free fatty acid levels corresponded with the reported increasing levels of phospholipase A activity in aged mitochondrial preparations. Washing these mitochondria with sucrose buffer containing 1% defatted bovine serum albumin (BSA) counteracted the aging effect on the RCI (E.G., 2.5 to 3.5) and reduced the free fatty acid levels (e.g., 50 to 16 nmol/mg protein). This reversible phenomenon could be repeated several times during the in vitro aging at 0 degrees C. Use of 125I-iodinated BSA showed that approximately 5 microgram BSA/mg mitochondria was adsorbed by the mitochondrial membranes during washing. These results indicate a direct correlation between the level of endogenous fatty acids and the uncoupling of mitochondrial oxidative phosphorylation. The mechanism of counteracting the aging effect by BSA involves the removal of some of the free fatty acids. |
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Authors:
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S H Chan; E Higgins |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Canadian journal of biochemistry Volume: 56 ISSN: 0008-4018 ISO Abbreviation: Can. J. Biochem. Publication Date: 1978 Feb |
Date Detail:
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Created Date: 1978-05-08 Completed Date: 1978-05-08 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0421034 Medline TA: Can J Biochem Country: CANADA |
Other Details:
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Languages: eng Pagination: 111-6 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adenosine Diphosphate
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metabolism Animals Fatty Acids, Nonesterified / metabolism* Male Mitochondria, Liver / drug effects, metabolism* Oxidative Phosphorylation Oxygen Consumption Rats Serum Albumin, Bovine / pharmacology Uncoupling Agents* |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids, Nonesterified; 0/Serum Albumin, Bovine; 0/Uncoupling Agents; 58-64-0/Adenosine Diphosphate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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