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Equine pituitary adenoma: a functional and morphological study

C E Boujon1, G E Bestetti, H P Meier

  • 1Institute of Animal Pathology, University of Berne, Switzerland.

Journal of Comparative Pathology
|August 1, 1993
PubMed
Summary

Equine pituitary adenomas involve overproduction of pro-opiomelanocortin (POMC)-derived peptides, differing from human Cushing's disease. This study examines functional and morphological features in horses with pituitary tumors and hyperplasia.

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Area of Science:

  • Veterinary Pathology
  • Endocrinology
  • Equine Medicine

Background:

  • Clinico-pathological correlations in horses with pituitary adenomas are not well understood.
  • Equine pituitary syndrome is often misaligned with human Cushing's disease.
  • Pituitary adenomas and hyperplasia are key areas of study in equine endocrinology.

Purpose of the Study:

  • To describe functional and morphological features of equine pituitary adenomas.
  • To investigate pituitary hyperplasia in horses.
  • To clarify the hormonal basis of equine pituitary disorders.

Main Methods:

  • Examination of five cases of equine pituitary adenoma.
  • Analysis of one case of equine multinodular pituitary hyperplasia.
  • Immunoreactivity testing for various pituitary hormones including beta-lipotropin (beta-LPH), beta-melanocyte-stimulating hormone (beta-MSH), and follicle-stimulating hormone (FSH).

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Main Results:

  • Neoplastic pituitary adenoma cells showed immunoreactivity for beta-lipotropin (beta-LPH), beta-melanocyte-stimulating hormone (beta-MSH), gamma 3-MSH, prolactin (PRL), and follicle-stimulating hormone (FSH).
  • Multinodular pituitary hyperplasia exhibited beta-lipotropin (beta-LPH), beta-endorphin (beta-END), alpha-MSH, beta-MSH, gamma 3-MSH, and FSH immunoreactivity.
  • Findings suggest a distinct pathophysiology from human Cushing's disease.

Conclusions:

  • Equine pituitary syndrome is linked to the overproduction of pro-opiomelanocortin (POMC)-derived peptides.
  • The condition arises from tumor or hyperplastic nodule cells in the pituitary gland.
  • This study differentiates equine pituitary disorders from human Cushing's disease based on hormonal profiles.