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Journal of Neuroscience, Vol 9, 3072-3082, Copyright © 1989 by Society for Neuroscience
Evidence for hippocampal regulation of neuroendocrine neurons of the hypothalamo-pituitary-adrenocortical axis
JP Herman, MK Schafer, EA Young, R Thompson, J Douglass, H Akil and SJ Watson
Mental Health Research Institute, University of Michigan, Ann Arbor 48109.
Expression of mRNAs coding for the ACTH secretagogues corticotropin-
releasing factor (CRF) and arginine vasopressin (AVP) was examined in the
hypothalamic paraventricular nucleus (PVN) of rats bearing hippocampal
lesions. Either total hippocampectomy (HPX) or extirpation of the dorsal
hippocampus (DHPX) precipitated a 4-fold increase in CRF mRNA expression
relative to sham-operated controls (SHAM), as determined by
semiquantitative in situ hybridization histochemistry. AVP mRNA was
localized to individual parvocellular neurons of the medial parvocellular
division of the PVN in only the HPX and DHPX groups, consistent with
enhanced production of AVP message in this neuronal population subsequent
to hippocampal damage. HPX did not affect AVP mRNA content in magnocellular
divisions of PVN. Plasma beta- endorphin levels were significantly elevated
in the HPX and DHPX groups relative to SHAM animals, indicating a chronic
increase in release of proopiomelanocortin peptides from the anterior
pituitary gland in response to hippocampal lesion. Circulating
corticosterone levels were elevated in HPX rats as well. To control for
effects of lesion size and location, additional animals received large
ablations of cerebral cortex or cerebellum. In neither case was CRF or AVP
mRNA significantly altered in the PVN. The results suggest that the
hippocampus exercises a tonic inhibitory role on ACTH secretagogue
production in neuroendocrine neurons promoting ACTH release.
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