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hCS regulation during pregnancy

J C Prieto, M Serrano-Rios

    Obstetrics and Gynecology
    |September 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Sudden maternal glucose changes, not continuous infusions, affect human chorionic somatomammotropin (hCS) secretion. Arginine infusion also increased hCS, highlighting its similarity to growth hormone.

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    Area of Science:

    • Endocrinology
    • Reproductive Biology
    • Metabolic Disorders

    Background:

    • Human chorionic somatomammotropin (hCS) plays a crucial role in pregnancy.
    • Understanding hCS regulation is vital for managing gestational metabolic health.
    • Homeostatic mechanisms influencing hCS secretion require further elucidation.

    Purpose of the Study:

    • To investigate the homeostatic mechanisms regulating human chorionic somatomammotropin (hCS) secretion.
    • To determine the impact of glucose and arginine stimuli on hCS plasma levels in pregnant women with varying glucose tolerance.

    Main Methods:

    • Plasma hCS levels were measured using radioimmunoassay.
    • Participants included normal, prediabetic, and chemically diabetic pregnant women.
    • Stimuli included oral glucose, continuous intravenous glucose, acute intravenous glucose, and intravenous arginine.

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    Main Results:

    • Oral glucose and continuous intravenous glucose infusion did not alter hCS plasma levels.
    • A rapid acute intravenous glucose infusion led to a decrease in hCS levels.
    • Intravenous arginine administration resulted in increased hCS levels.

    Conclusions:

    • Sudden fluctuations in maternal plasma glucose, rather than sustained levels, appear to regulate hCS secretion.
    • The response to arginine further supports the structural and functional parallels between hCS and growth hormone.
    • These findings contribute to understanding hCS homeostatic control during pregnancy.