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Long-term adrenalectomy can decrease or increase hippocampal dentate gyrus volumes

C D Conrad1, D Leone, R R Nemivant

  • 1Neuroscience Program, University of Illinois, Champaign 61821, USA.

Journal of Neuroendocrinology
|May 1, 1997
PubMed
Summary
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Long-term adrenalectomy in rats can cause either increased or decreased dentate gyrus volumes. Residual corticosterone levels appear to determine the direction of this volumetric response in the hippocampus.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Neuroanatomy

Background:

  • The adrenal gland produces hormones crucial for stress response and metabolism.
  • The hippocampus, particularly the dentate gyrus, is known to be sensitive to hormonal influences.

Purpose of the Study:

  • To investigate the long-term effects of adrenalectomy on dentate gyrus volume in male and female rats.
  • To determine if sex influences the dentate gyrus response to adrenalectomy.
  • To explore the relationship between residual hormonal levels and dentate gyrus volume changes.

Main Methods:

  • Adult male and female Long-Evans rats underwent adrenalectomy or sham surgery.
  • Dentate gyrus and CA3 volumes were measured 6 weeks post-surgery.
  • Correlations were analyzed between dentate gyrus volume and hormonal level indices (Na+/K+ ratio, body weight gain).

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Main Results:

  • Adrenalectomy resulted in significantly reduced dentate gyrus volumes in a subset of rats compared to sham controls.
  • Conversely, other adrenalectomized rats showed significantly increased dentate gyrus volumes.
  • Dentate gyrus volume changes correlated with residual hormonal levels, suggesting corticosterone's role.
  • No changes in CA3 volumes indicated that observed effects were specific to the dentate gyrus and not general tissue shrinkage.

Conclusions:

  • Long-term adrenalectomy can lead to bidirectional volumetric changes in the rat dentate gyrus.
  • Individual differences in residual adrenal steroid levels are likely key determinants of the dentate gyrus response.
  • These findings highlight the complex interplay between adrenal hormones and hippocampal neuroanatomy.