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Related Experiment Videos

Prolactin induces adrenal hypertrophy.

E J Silva1, L F Felicio, A G Nasello

  • 1Departamento de Patologia, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Av. Prof. Orlando M. de Paiva 87, 05508-9000 São Paulo, SP, Brazil. ejsilva@usp.br

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|February 6, 2004
PubMed
Summary

Prolactin, a pituitary hormone, significantly increases adrenal gland weight and zona fasciculata cell size in rats. This suggests prolactin induces adrenocortical cell hypertrophy, impacting adrenal function beyond traditional regulation.

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Reproduction, fertility, and development·2016

Area of Science:

  • Endocrinology
  • Reproductive Biology
  • Cell Biology

Background:

  • Adrenocorticotropic hormone (ACTH) is the primary regulator of adrenal glucocorticoid secretion.
  • Emerging evidence suggests other pituitary hormones, such as prolactin, also influence adrenal function.
  • The transition from prepubertal to postpubertal stages may alter hormonal regulation of the adrenal gland.

Purpose of the Study:

  • To investigate the role of prolactin in adrenal gland regulation.
  • To measure adrenocortical cell area and adrenal weight in hyperprolactinemic rats.
  • To assess the impact of hyperprolactinemia during the prepubertal to postpubertal transition.

Main Methods:

  • Domperidone was administered to induce hyperprolactinemia in rats.
  • Adrenal gland weight was measured at necropsy in adult and young rats.

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  • Adrenocortical cell area, specifically zona fasciculata, was quantified using microscopy.

    • Main Results:

    • Hyperprolactinemic rats exhibited significantly heavier adrenal glands compared to controls.
    • The area of zona fasciculata cells was markedly increased in hyperprolactinemic adult and young rats.
    • These effects were observed across different age points, indicating a consistent impact of hyperprolactinemia.

    Conclusions:

    • The increased adrenal weight in hyperprolactinemic rats is likely due to prolactin-induced adrenocortical cell hypertrophy.
    • Prolactin plays a significant role in regulating adrenal gland size and cellular morphology.
    • These findings highlight a non-traditional pathway in adrenal function regulation by pituitary hormones.