Cited by 56Steroid Chemistry and BiochemistryCholesterol and Lipid MetabolismHormonal Regulation and Hypertension

Oxidation of cholesterol and cholesterol analogues by mitochondrial preparations of steroid-hormone-producing tissue

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Arthur, J R, Blair, H A F, Boyd, G S, Mason, J I, Suckling, K E·1976·Biochemical Journal

Abstract

The rate of oxidation of cholesterol and its analogues to pregnenolone (3beta-hydroxypregn-5-en-20-one) by various mitochondrial preparations was measured. Sterols with the cholest-5-en-3beta-ol ring system and saturated side chains of different lengths were converted into pregnenolone rat rates similar to that of cholesterol. This marked lack of mitochondrial specificity towards the steroid side chains is in direct contrast with the rat liver microsomal cholesterol 7alpha-hydroxylase, which has a high specificity for the side chain. Steroids that retain the ring system, but contain hydroxyl groups at various points in the side chain, are converted into pregnenolone at rates three to eight times higher than in cholesterol. The results are discussed with reference to current ideas on the mechanism of the side-chain cleavage of cholesterol. The results are discussed with reference to current ideas on the mechanism of the side-chain cleavage of cholesterol.

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  • Purified CYP11A1 and/or steroidogenic mitochondria can act on a range of steroids or secosteroids other than cholesterol.

    “Studies carried out over a number of years reveal that purified CYP11A1 and/or steroidogenic mitochondria that contain CYP11A1, can act on a range of steroids or secosteroids, other than cholesterol.”
  • Desmosterol is converted to pregnenolone by bovine, rat, and human CYP11A1 with similar catalytic efficiency to cholesterol.

    “Desmosterol (5,24-cholestadien-3β-ol, see Fig. 1), which has recently come to prominence, is also converted to pregnenolone by bovine, rat, and human CYP11A1 [16,17,19], with similar catalytic efficiency to that seen for cholesterol [48].”
  • Purified bovine and human CYP11A1 and steroidogenic mitochondria cleave the side chains of 24-hydroxycholesterol, 25-hydroxycholesterol, and 27-hydroxycholesterol.

    “These include cleaving the side chains of 24-hydroxycholesterol, 25-hydroxycholesterol, and 27-hydroxycholesterol (discussed above) [16,17,19,48].”

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1 of the 13 references couldn’t be matched to a known paper.

Research works printed but not linked: 4

  1. Ali, S. A. M. (1968) Ph.D. Thesis, University of Edin- burgh
  2. Arthur, J. R., Blair, H. A. F., Boyd, G. S., Hattersley, N. G. & Suckling, K. E. (1975) Biochem. Soc. Trans. 3, 963-964
  3. Shikita, M. & Hall, P. F. (1974) Proc. Natl. Acad. Sci.
  4. Tait, A. D. (1972) Biochem. J. 128, 467-470 Vol. 158

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Authors
Arthur, J. R., Blair, H. A. F., Boyd, G. S., Mason, J. I., & Suckling, K. E.
Affiliations
University of Edinburgh (GB)
Venue
Biochemical Journal
Published
1976-07-15
Volume
158
Issue
1
Pages
47-51
ISSN
0264-6021 (ISSN-L)
OpenAlex
W1947355021
Cited by
56
References
13
Citations by year
2024: 1 · 2023: 2 · 2021: 1 · 2020: 1 · 2019: 1 · 2015: 2 · 2014: 1 · 2013: 1 · 2012: 1
FWCI
1.31
Type
journal article
Language
en
Open access
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 › Hormonal Regulation and Hypertension
Keywords
cholesterol oxidation, pregnenolone, mitochondrial preparation, cholesterol analogues, 7alpha-hydroxylase
MeSH terms
Adrenal Cortex, Adrenal Glands, Animals, Cattle, Cholanes, Cholesterol, Desmosterol, Male, Mitochondria, Oxidation-Reduction, Pregnenolone, Sitosterols, Swine, Testis, Rats

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