The ovulatory gonadotrophin surge stimulates cyclooxygenase expression and prostaglandin production by the monkey follicle

Diane M. Duffy, Richard Stouffer

    Research output: Contribution to journalArticle

    96 Citations (Scopus)

    Abstract

    Follicular prostaglandin concentrations increase following the gonadotrophin surge in domestic animals and rodents ∼10 h before follicle rupture, suggesting a unifying role for prostaglandins in the timing of ovulation. However, little is known about prostaglandin production by the primate ovulatory follicle. In this study, adult female macaques received gonadotrophins to promote follicular development. Granulosa cells, follicular fluid, and ovaries were collected before (0 h) and 12, 24 or 36 h after administration of the ovulatory stimulus, human chorionic gonadotrophin (HCG). Cyclooxygenase (COX) isoform expression was assessed by reverse transcription-polymerase chain reaction and immunocytochemistry and follicular prostaglandin production was determined by enzyme immunoassay. COX-2 mRNA expression in granulosa cells was low at 0 h, rose 50-fold by 12 h, and remained elevated through to 36 h. COX-2 immunostaining was present in granulosa cells after, but not before, exposure to HCG. COX-1 mRNA levels did not change during the periovulatory interval, and COX-1 immunostaining of granulosa cells was not detected. Follicular fluid prostaglandin (PG) E2 and PGF concentrations were low through to 24 h but increased 100-fold at 36 h. The elevated follicular prostaglandin concentrations 4-16 h before the expected time of ovulation support the hypothesis that the time between the LH surge and increased follicular prostaglandins determines the length of the periovulatory period. Differences between the localization and timing of COX-2 expression in monkey versus non-primate follicles suggest that the pattern of COX-2 expression and activity has aspects unique to primates.

    Original languageEnglish (US)
    Pages (from-to)731-739
    Number of pages9
    JournalMolecular Human Reproduction
    Volume7
    Issue number8
    StatePublished - 2001

    Fingerprint

    Prostaglandin-Endoperoxide Synthases
    Gonadotropins
    Prostaglandins
    Haplorhini
    Granulosa Cells
    Cyclooxygenase 2
    Follicular Fluid
    Cyclooxygenase 1
    Chorionic Gonadotropin
    Ovulation
    Primates
    Messenger RNA
    Dinoprost
    Domestic Animals
    Macaca
    Immunoenzyme Techniques
    Dinoprostone
    Reverse Transcription
    Rupture
    Ovary

    Keywords

    • Cyclooxygenase
    • Follicle
    • Gonadotrophin surge
    • Ovulation
    • Prostaglandin

    ASJC Scopus subject areas

    • Obstetrics and Gynecology
    • Genetics
    • Developmental Biology
    • Embryology
    • Cell Biology

    Cite this

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    abstract = "Follicular prostaglandin concentrations increase following the gonadotrophin surge in domestic animals and rodents ∼10 h before follicle rupture, suggesting a unifying role for prostaglandins in the timing of ovulation. However, little is known about prostaglandin production by the primate ovulatory follicle. In this study, adult female macaques received gonadotrophins to promote follicular development. Granulosa cells, follicular fluid, and ovaries were collected before (0 h) and 12, 24 or 36 h after administration of the ovulatory stimulus, human chorionic gonadotrophin (HCG). Cyclooxygenase (COX) isoform expression was assessed by reverse transcription-polymerase chain reaction and immunocytochemistry and follicular prostaglandin production was determined by enzyme immunoassay. COX-2 mRNA expression in granulosa cells was low at 0 h, rose 50-fold by 12 h, and remained elevated through to 36 h. COX-2 immunostaining was present in granulosa cells after, but not before, exposure to HCG. COX-1 mRNA levels did not change during the periovulatory interval, and COX-1 immunostaining of granulosa cells was not detected. Follicular fluid prostaglandin (PG) E2 and PGF2α concentrations were low through to 24 h but increased 100-fold at 36 h. The elevated follicular prostaglandin concentrations 4-16 h before the expected time of ovulation support the hypothesis that the time between the LH surge and increased follicular prostaglandins determines the length of the periovulatory period. Differences between the localization and timing of COX-2 expression in monkey versus non-primate follicles suggest that the pattern of COX-2 expression and activity has aspects unique to primates.",
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    AB - Follicular prostaglandin concentrations increase following the gonadotrophin surge in domestic animals and rodents ∼10 h before follicle rupture, suggesting a unifying role for prostaglandins in the timing of ovulation. However, little is known about prostaglandin production by the primate ovulatory follicle. In this study, adult female macaques received gonadotrophins to promote follicular development. Granulosa cells, follicular fluid, and ovaries were collected before (0 h) and 12, 24 or 36 h after administration of the ovulatory stimulus, human chorionic gonadotrophin (HCG). Cyclooxygenase (COX) isoform expression was assessed by reverse transcription-polymerase chain reaction and immunocytochemistry and follicular prostaglandin production was determined by enzyme immunoassay. COX-2 mRNA expression in granulosa cells was low at 0 h, rose 50-fold by 12 h, and remained elevated through to 36 h. COX-2 immunostaining was present in granulosa cells after, but not before, exposure to HCG. COX-1 mRNA levels did not change during the periovulatory interval, and COX-1 immunostaining of granulosa cells was not detected. Follicular fluid prostaglandin (PG) E2 and PGF2α concentrations were low through to 24 h but increased 100-fold at 36 h. The elevated follicular prostaglandin concentrations 4-16 h before the expected time of ovulation support the hypothesis that the time between the LH surge and increased follicular prostaglandins determines the length of the periovulatory period. Differences between the localization and timing of COX-2 expression in monkey versus non-primate follicles suggest that the pattern of COX-2 expression and activity has aspects unique to primates.

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