Expression of the insulin-like growth factor (Igf)-i and -ii and the igf-i and -ii receptor genes during postnatal development of the rat ovary

M. J. Levy, E. R. Hernandez, E. Y. Adashi, R. J. Stillman, C. T. Roberts, D. Leroith

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    Solution hybridization/RNase protection assays were used to study the developmental expression of the insulin-like growth factor-I (IGF- I), IGF-II, IGF-I receptor, and IGF-II/mannose-6-phosphate receptor genes in the rat ovary between postnatal days 1-80. Maximal IGF-I mRNA levels occurred during the 15- to 25-day postnatal period, and the level on day 20 represented a 9-fold increase over the baseline at earlier and later stages. IGF-II mRNA levels were maximal during the 1- to 5-day postnatal period and subsequently declined to undetectable levels after day 10. IGF-I receptor mRNA levels increased 10-fold to a maximum in the 20- to 25-day postnatal period. This pattern was similar to the developmental pattern of [125I]IGF-I binding in the ovary. Two apparent peaks of IGF-II/mannose-6-phosphate receptor mRNA levels were seen, on day 20 and between days 50-80. These specific and significant changes in the expression of the genes encoding the IGFs and their receptors suggest a role for the IGF system in postnatal ovarian development.

    Original languageEnglish (US)
    Pages (from-to)1202-1206
    Number of pages5
    Issue number3
    StatePublished - Sep 1992


    ASJC Scopus subject areas

    • Endocrinology

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