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Adrenocortical apoptosis in hypophysectomized rats is selectively reduced by ACTH
S Ceccatelli1, A Diana, M J Villar
1Department of Neuroscience, Karolinska Institute, Stockholm, Sweden.
Neuroreport
|January 26, 1995
Summary
Adrenocorticotropic hormone (ACTH) reduces but does not fully prevent apoptosis in the adrenal cortex of hypophysectomized rats. Other pituitary hormones may also influence adrenal cell death, particularly in the zona reticularis.
Area of Science:
- Endocrinology
- Cell Biology
- Histology
Background:
- Hypophysectomy, the surgical removal of the pituitary gland, significantly impacts the adrenal cortex.
- Apoptosis, or programmed cell death, plays a crucial role in regulating tissue homeostasis.
Purpose of the Study:
- To investigate the occurrence and localization of apoptosis in the adrenal cortex of hypophysectomized rats.
- To determine the effect of adrenocorticotropic hormone (ACTH) replacement on apoptosis in this model.
Main Methods:
- In situ labeling of DNA breaks using the TUNEL assay.
- Staining with propidium iodide to assess cell viability.
- Histological examination of adrenal cortex tissue from hypophysectomized rats with and without ACTH replacement.
Main Results:
- Apoptosis was detected in the zona fasciculata and zona reticularis by day 3 post-hypophysectomy.
- By day 6, apoptotic cells were predominantly observed in the zona fasciculata.
- ACTH replacement largely prevented cell death in most zones, except for the zona reticularis.
Conclusions:
- Adrenocorticotropic hormone (ACTH) can reduce, but not completely abolish, apoptosis in the adrenal cortex of hypophysectomized rats.
- The continued apoptosis in the zona reticularis suggests that other pituitary hormones, besides ACTH, may be involved in regulating cell survival in this adrenal layer.