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Islet cell population changes induced by short term ovariectomy.

M C Semino, M E García, A M Galeano

    Acta Physiologica Et Pharmacologica Latinoamericana : Organo De La Asociacion Latinoamericana De Ciencias Fisiologicas Y De La Asociacion Latinoamericana De Farmacologia
    |January 1, 1986
    PubMed
    Summary

    Ovariectomy in rats led to reduced total endocrine pancreas volume but increased individual islet size. This suggests islet cell hyperplasia, particularly in B cells, may explain altered insulin secretion findings.

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    Area of Science:

    • Endocrinology
    • Histology
    • Pancreatic Biology

    Background:

    • Ovariectomy, the surgical removal of ovaries, significantly impacts hormonal balance.
    • The endocrine pancreas plays a crucial role in glucose homeostasis through insulin secretion.
    • Previous studies show conflicting effects of ovariectomy on insulin secretion.

    Purpose of the Study:

    • To investigate the morphological changes in the endocrine pancreas after ovariectomy in rats.
    • To elucidate the cellular basis for observed discrepancies in insulin secretion studies.

    Main Methods:

    • Age-matched control and ovariectomized rats were used.
    • Pancreatic tissue was stained using p-aldehyde-fuchsin and anti-insulin serum (peroxidase method).
    • Morphometric analysis was performed using the Weibel technique.

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    Main Results:

    • Ovariectomy resulted in a decrease in the total volume of the endocrine pancreas.
    • A significant increase in the volume of individual islets of Langerhans was observed.
    • This increase in islet volume was attributed to an increase in islet cell number (hyperplasia), primarily of B cells, without cellular hypertrophy.

    Conclusions:

    • Ovariectomy induces significant changes in pancreatic islet morphology, characterized by hyperplasia.
    • These morphological alterations may reconcile conflicting data on insulin secretion following ovariectomy.
    • The findings highlight the complex interplay between ovarian hormones and pancreatic islet function.