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Corticotropin‐Releasing Factor (CRF), CRF‐Binding Protein (CRF‐BP), and CRF/CRF‐BP Complex in Alzheimer's Disease and Control Postmortem Human Brain
Author(s) -
Behan Dominic P.,
Khongsaly On,
Owens Michael J.,
Chung Hyung D.,
Nemeroff Charles B.,
De Souza Errol B.
Publication year - 1997
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1046/j.1471-4159.1997.68052053.x
Subject(s) - medicine , globus pallidus , endocrinology , temporal cortex , human brain , receptor , alzheimer's disease , corticotropin releasing hormone , chemistry , biology , neuroscience , central nervous system , basal ganglia , disease
In Alzheimer's disease (AD) there are dramatic reductions in human corticotropin‐releasing factor (hCRF) concentration and reciprocal increases in CRF receptor density in the cortex. hCRF‐binding protein (hCRF‐BP), hCRF/hCRF‐BP complex, and “free” hCRF were measured in 10 brain regions from control and AD postmortem human tissue. In the control brains hCRF‐BP was heterogenously distributed and levels were at least 10‐fold higher on a molar basis than total hCRF levels, suggesting that one major role of the binding protein is to limit the actions of hCRF at the hCRF receptors. Concordant with this hypothesis, the percentage of total hCRF that was in the bound inactive form ranged from 65 to 90% in most areas examined, with the exception of the caudate and globus pallidus where only 15 and 40% were complexed, respectively. hCRF‐BP concentrations were similar in the control and AD groups except for Brodmann area (BA) 39 where there was a small but significant decrease in the AD group. Complexed hCRF levels were significantly decreased in BA 8/BA 9, BA 22, BA 39, nucleus basalis, and globus pallidus in the Alzheimer's group and free hCRF levels were significantly decreased only in three brain areas, BA 4, BA 39, and caudate; substantial (40%) but nonsignificant decreases were also noted in BA 8/BA 9 and BA 22. These data demonstrate that (1) a large proportion of the total hCRF in human brain is complexed to hCRF‐BP and thus unavailable for hCRF receptor activation, (2) reductions in total hCRF alone do not necessarily predict reductions in bioactive free hCRF, and (3) total hCRF levels and hCRF‐BP levels appear to be the main factors determining the quantity of bound and free hCRF in human brain.