Steroids in the follicular fluid and the corpus luteum of the mare. A “two-cell type” theory of ovarian steroid synthesis
Abstract
SUMMARY A comparison has been made between the steroids present in equine follicular fluid and luteal tissue. Follicular fluid was found to contain progesterone, 17α-hydroxyprogesterone, androstenedione, epitestosterone, 19-norandrostenedione, oestrone, oestradiol-17β and 6α-hydroxyoestradiol-17β, in confirmation of previous studies. On the other hand, luteal tissue contained large amounts of progesterone and 20α-hydroxypregn-4-en-3-one, and a small quantity of 17α-hydroxyprogesterone. No C18 or C19 steroids could be detected. These findings are therefore interpreted as evidence in favour of a 'two-cell type' theory of steroid formation in the ovary. One type, possibly the theca interna cell, has the ability to convert progesterone into oestrogens; the other type, possibly the luteinized granulosa cell, has a diminished 17-hydroxylating ability and is unable to cleave the C21 side chain to make C18 and C19 steroids. However, it does have an active 20-reductase enzyme system present.
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Ovarian steroid output varies considerably during menstrual cycle - 17β-estradiol is primary steroid produced during follicular phase, while progesterone is principal steroid during luteal phase.
“Ovarian steroid output varies considerably during the course of the menstrual cycle – 17β-estradiol is the primary steroid produced during the follicular phase, while progesterone is the principal steroid during the luteal phase [[77], [78], [79]].”
From Human steroid biosynthesis, metabolism and excretion are differentially reflected by serum and urine steroid metabolomes: a comprehensive review (2019) · cites this paper as [77]
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Mahajan, D. K. (2008) · Humana Press eBooks · doi:10.1007/978-1-59745-285-4_45 · Cited by 14 · see citing works
CHERRY, J. A., Hou, X., Rueda, B. R., Davis, J. S., & Townson, D. H. (2008) · Journal of Reproduction and Development · doi:10.1262/jrd.19182 · Cited by 14 · see citing works
- Authors
- SHORT, R. V.
- Corresponding author
- SHORT, R. V.
- Venue
- Journal of Endocrinology
- Publisher
- Bioscientifica
- Published
- 1962-03-01
- Volume
- 24
- Issue
- 1
- Pages
- 59-63
- ISSN
- 0022-0795 (ISSN-L)
- 1479-6805
- OpenAlex
- W2168319499
- Cited by
- 176
- References
- 0
- Citations by year
- 2025: 2 · 2024: 5 · 2023: 1 · 2021: 2 · 2020: 2 · 2019: 2 · 2018: 3 · 2017: 3 · 2016: 3 · 2015: 3 · 2013: 2 · 2012: 2
- FWCI
- 12.32
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Reproductive Physiology in Livestock
- Health Sciences › Medicine › Reproductive Medicine › Ovarian function and disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
- Keywords
- ovarian steroids, follicular fluid, corpus luteum, mares, horses, progesterone, 17-hydroxyprogesterone, androstenedione, epitestosterone, estradiol, estrone, 20α-hydroxypregn-4-en-3-one, theca interna cells, luteinized granulosa cells, steroidogenesis
- MeSH terms
- Animals, Corpus Luteum, Corpus Luteum Hormones, Female, Ovarian Follicle, Horses, Humans, Steroids, Follicular Fluid
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