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• W2163600135 abstract "Corticotropin-releasing factor (CRF) coordinates the mammalian response to stress. In the amygdala, the CRF system appears to be responsible, at least in part, for the behavioral responses resulting from stress. Associated with amygdalar CRF is a 37 kDa binding protein (CRF-BP) which may also play a role in regulating stressful stimuli. Aging has been shown to be associated with abnormal neuroendocrine stress systems and little is known with regards to how amygdalar stress systems change with aging. In our study, we have assessed levels of amygdalar CRF and CRF-BP mRNA in Fischer 344 rats of 4, 12 or 24 months of age following 14 days of hourly restraint. Prior to sacrifice, rats were also tested for anxiety-like behaviors on the elevated plus maze. After behavioral testing, rats were perfused with 4% paraformaldehyde and the brains were processed for in situ hybridization. Twenty micron sections were hybridized with a CRF as well as a CRF-BP riboprobe. Following hybridization, tissue sections were oppossed to X-ray film and relative amounts of mRNA in the amygdala were quantitated. Levels of CRF mRNA in the amygdala of 12 and 24 month-old rats following chronic restraint were significantly lower relative to rats which were handled for 14 days. There were no significant differences in amygdalar CRF gene expression between stressed and handled 4 month-old rats. At 12 and 24 months of age but not 4 months, there were also significant effects of restraint associated with decreases in amygdalar CRF-BP gene expression. Furthermore, there were reciprocal decreases in anxiety-like behaviors in the 12 and 24 month-old rats which were significant; the changes in anxiety-like behaviors between restrained vs. handled 4 month-old rats were not significantly different. The decreased gene expression of CRF in the amygdala in concert with decreased anxiety-like behaviors following restraint is consistent with the known behavioral effects of exogenously applied intra-amygdalar CRF. The changes in amygdalar CRF-BP observed may be secondary to the known regulatory effects that CRF exhibits on its binding-protein. These studies have relevance to better understanding the molecular basis of aging related changes in neuroendocrine stress systems." @default.
• W2163600135 created "2016-06-24" @default.
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• W2163600135 date "2000-09-01" @default.
• W2163600135 modified "2023-10-03" @default.
• W2163600135 title "Age-related alterations in emotional behaviors and amygdalar corticotropin-releasing factor (CRF) and CRF-binding protein expression in aged Fischer 344 rats" @default.
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• W2163600135 doi "https://doi.org/10.1016/s0006-8993(00)02606-8" @default.
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