Control of sterol metabolism in rat adrenal mitochondria
Open accessAbstract
Steroidogenesis by adrenal mitochondria from endogenous precursors is stimulated by corticotropin (ACTH) and is sensitive to the protein-synthesis inhibitor cycloheximide. In the present investigation the effect of cycloheximide treatment on the metabolism of a number of analogues of the normal steroidogenic substrate, i.e. cholesterol, by rat adrenal mitochondria was studied. It was observed that the metabolism of analogues such as desmosterol, 26-norcholest-5-en-3beta-ol and 5-cholen-3beta-ol (that is with non-polar alkyl side chains like cholesterol), was sensitive to cycloheximide treatment. By contrast, the metabolism of those analogues with polar groupings on the side chain, i.e., 20alpha-, 24-, 25- and 26-hydroxycholesterols was insensitive to pretreatment with cycloheximide. The binding of added sterol to the cytochrome P-450 component of the mitochondrial sterol desmolase was studied. Similar studies on the equilibration time on addition of exogenous sterols to achieve maximum rates of pregnenolone production were also made. Both studies show that cholesterol, a non-polar sterol, penetrated slowly through the mitochondrial milieu to reach the cytochrome P-450 reaction centre whereas 24- and 26-hydroxycholesterols rapidly attained the enzymic environment. The cycloheximide-sensitive process in sterol metabolism appeared related to the transfer of non-polar sterols such as cholesterol within the mitochondria to a region in close proximity to the enzyme. The importance, and possible mechanism of action, of the cycloheximide-sensitive factor in the control of adrenal steroidogenesis is discussed.
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- Authors
- Mason, J. I., Arthur, J. R., & Boyd, G. S.
- Affiliations
- University of Edinburgh (GB)
- Venue
- Biochemical Journal
- Publisher
- Portland Press Ltd.
- Published
- 1978-09-15
- Volume
- 174
- Issue
- 3
- Pages
- 1045-1051
- ISSN
- 0264-6021 (ISSN-L)
- PMC
- PMC1186010
- OpenAlex
- W1756280753
- Cited by
- 72
- References
- 15
- Citations by year
- 2021: 2 · 2020: 1 · 2014: 3
- FWCI
- 1.88
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Biochemical Journal (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Steroid Chemistry and Biochemistry
- Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
- Keywords
- steroidogenesis, adrenal mitochondria, sterol metabolism, cycloheximide, cholesterol, hydroxycholesterol, desmosterol, cytochrome P450, protein synthesis inhibition, ACTH
- MeSH terms
- Adrenal Glands, Aminoglutethimide, Animals, Cycloheximide, Cytochrome P-450 Enzyme System, Female, Mitochondria, Pregnenolone, Sterols, Stress, Physiological, Structure-Activity Relationship, Rats
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