Cited by 88Reproductive Biology and FertilityReproductive biology and impacts on aquatic speciesReproductive Physiology in Livestock

Role of meiosis activating sterols, MAS, in induced oocyte maturation

Byskov, Anne Grete, Andersen, Claus Yding, Leonardsen, Lise·2002·Molecular and Cellular Endocrinology

Abstract

Meiosis of follicle enclosed oocytes is maintained in the prophase of the first meiotic division and oocytes do not spontaneously resume meiosis during oocyte growth and follicle development. Arrest of the meiotic process is most likely secured by the presence of follicular purines, e.g. hypoxanthine, which maintain high levels of cAMP in the oocyte and which also in vitro prevent oocytes from resuming meiosis. Only in response to the mid-cycle surge of gonadotropins will oocytes of preovulatory follicles overcome the meiosis arresting effect of hypoxanthine and resume meiosis proceeding to the metaphase of the second meiotic division. Morphologically, resumption of meiosis is observed by the disappearance of the oocyte's nuclear membrane (germinal vesicle), a process called germinal vesicle breakdown (GVB). The molecular mechanism down-stream to receptor activation by which the mid-cycle surge of gonadotropins induces oocytes to resume meiosis is, however, only partly understood. The oocyte itself lacks gonadotropin receptors and its action is mediated through the attached cumulus cells. In vitro it has been shown that FSH induces synthesis of a signal in the cumulus cells, which overcomes the meiosis arresting effect of hypoxanthine. We have shown that a group of sterols, meiosis activating sterols (MAS), induces oocyte maturation in vitro even in oocytes depleted of cumulus cells. MAS were identified as intermediates in the cholesterol biosynthesis between lanosterol and c…

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Crossref · 10.1016/s0303-7207(01)00707-9

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  • Most of the 8,9-unsaturated sterols shown here to enhance oligodendrocyte formation have previously been shown to function as signaling lipids in oocytes by inducing the resumption of meiosis.

    “Most of the 8,9-unsaturated sterols shown here to enhance oligodendrocyte formation have previously been shown to function as signaling lipids in oocytes by inducing the resumption of meiosis19,20”
  • Past work suggested nuclear hormone receptors (NHRs) may play a role in the direct cellular targets of 8,9-unsaturated 'meiosis-activating sterols'.

    “While the direct cellular targets of 8,9-unsaturated ‘meiosis-activating sterols’ remain poorly understood, past work suggested nuclear hormone receptors (NHRs) may play a role19”

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Authors
Byskov, A. G., Andersen, C. Y., & Leonardsen, L.
Affiliations
University of Copenhagen (DK)
Corresponding author
Byskov, Anne Grete
Venue
Molecular and Cellular Endocrinology
Publisher
Elsevier BV
Published
2002-02
Volume
187
Issue
1-2
Pages
189-196
ISSN
0303-7207 (ISSN-L)
OpenAlex
W2089838946
Cited by
88
References
55
Citations by year
2026: 1 · 2024: 6 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 3 · 2019: 4 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 3 · 2014: 1 · 2013: 5 · 2012: 5
FWCI
7.98
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular and Cellular Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Reproductive Biology and Fertility
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Reproductive biology and impacts on aquatic species
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Reproductive Physiology in Livestock
Keywords
meiosis-activating sterols, oocyte maturation, meiotic resumption, germinal vesicle breakdown, follicular fluid, cholesterol biosynthesis, lanosterol, FSH signaling, signal transduction, cumulus cells, hypoxanthine, gonadotropin surge, sterol synthesis inhibitors
MeSH terms
Animals, Cell Differentiation, Cholestenes, Female, Gonadotropins, Humans, Meiosis, Oocytes

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