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Pituitary gland changes in canine hypoadrenocorticism: a functional and immunocytochemical study
C E Boujon1, V Bornand-Jaunin, V Schärer
1Institute of Animal Pathology, University of Berne, Switzerland.
Journal of Comparative Pathology
|October 1, 1994
Summary
Pituitary gland changes in dogs with hypoadrenocorticism (HAC) differ based on type. Primary HAC shows increased adrenocorticotropic hormone (ACTH) in the pituitary, while secondary HAC shows decreased ACTH, aligning with clinical findings.
Area of Science:
- Veterinary Endocrinology
- Canine Pathology
Background:
- Hypoadrenocorticism (HAC) is an endocrine disorder affecting dogs.
- Understanding pituitary gland changes is crucial for diagnosing and managing HAC.
- Primary and secondary HAC have distinct pathophysiological mechanisms.
Purpose of the Study:
- To investigate pituitary gland alterations in canine hypoadrenocorticism.
- To correlate immunocytochemical findings with clinical, endocrinological, and pathological data.
- To differentiate pituitary changes between primary and secondary HAC.
Main Methods:
- Immunocytochemical evaluation of pituitary glands in dogs with HAC.
- Correlation of pituitary findings with clinical signs, hormone levels, and adrenal histopathology.
- Analysis of adrenocorticotropic hormone (ACTH) immunoreactivity in the pituitary pars distalis.
Main Results:
- In primary HAC, increased pituitary ACTH immunoreactivity was observed alongside severe adrenal cortical atrophy.
- In secondary HAC, decreased pituitary ACTH immunoreactivity, low basal plasma ACTH, and specific adrenal layer atrophy were noted.
- Pituitary gland changes were distinct between primary and secondary HAC, consistent with underlying disease mechanisms.
Conclusions:
- Pituitary gland immunocytochemistry reveals differential changes in primary versus secondary canine HAC.
- Findings support distinct mechanisms of ACTH regulation and adrenal gland involvement in the two HAC forms.
- These pituitary alterations correlate with clinical presentations and pathological findings in HAC dogs.