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Related Experiment Videos

Characterization of rat chorionic mammotropin.

P A Kelly, R P Shiu, M C Robertson

    Endocrinology
    |May 1, 1975
    PubMed
    Summary

    Researchers identified rat chorionic mammotropin (rCM) in pregnant rat serum using radioreceptor assay. Two activity peaks were observed, with differing molecular weights and clearance rates throughout gestation.

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    Area of Science:

    • Reproductive Biology
    • Endocrinology
    • Biochemistry

    Background:

    • Placental lactogens are crucial hormones in mammalian pregnancy.
    • Rat chorionic mammotropin (rCM) is a key placental hormone.
    • Understanding rCM's dynamics is vital for reproductive physiology.

    Purpose of the Study:

    • To identify and characterize rat chorionic mammotropin (rCM) in pregnant rat serum.
    • To analyze the temporal changes in rCM levels and molecular forms during gestation.
    • To investigate the clearance rate of rCM in maternal circulation.

    Main Methods:

    • Radioreceptor assay (RRA) was employed to detect rCM in serum and placental extracts.
    • Gel filtration chromatography (G-100 column) was used to determine molecular weights.
    • Electrophoresis was performed to analyze rCM mobility and size.
    • Half-time disappearance rates were calculated to assess serum clearance.

    Main Results:

    • Two distinct peaks of rCM activity were detected in serum during pregnancy (days 11-13 and 17-21).
    • Gel filtration revealed different molecular weight forms of rCM in early versus late gestation.
    • Placental rCM concentration peaked mid-pregnancy and declined by day 21.
    • Serum rCM exhibited significantly faster clearance in late pregnancy compared to early pregnancy.

    Conclusions:

    • Rat chorionic mammotropin (rCM) circulates in maternal serum with distinct temporal patterns.
    • The molecular characteristics and clearance kinetics of rCM change throughout rat pregnancy.
    • These findings provide insights into the hormonal regulation of pregnancy in rats.

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