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- W2034389873 abstract "To test the hypothesis that chronically elevated sympathetic drive is associated with hyperreactiveness of autonomic centers in the brain to stress, adult spontaneously hypertensive rats (SHRs) and two strains of normotensive rats (Wistar Kyoto [WKY] and Sprague Dawley [SD] rats) were acutely exposed to restraint stress; controls from each strain were not stressed. Brain sections were prepared for Fos immunohistochemistry to identify activated neurons in the paraventricular nucleus of the hypothalamus, Barrington's nucleus of the pons, nucleus of the tractus solitarius, and ventrolateral medulla, or for combined Fos immunohistochemistry and corticotropin-releasing factor (CRF) in situ hybridization in the paraventricular nucleus and Barrington's nucleus. Restraint led to increased activation of neurons in all nuclei. Strain differences were found only in the caudal and rostral paraventricular nucleus where restraint resulted in greater numbers of activated neurons in SHRs compared to either normotensive strain. Levels of CRF mRNA in Barrington's nucleus of unrestrained rats were similar among strains. After restraint, mRNA levels and double labeled neurons were increased in Barrington's nucleus of SHRs. In unstressed rats, CRF mRNA levels were elevated in some regions of the paraventricular nucleus in SHRs. After restraint, mRNA levels increased throughout the paraventricular nucleus of SHRs. Significantly greater numbers of double labeled neurons were found in the dorsolateral medial and ventral medial parvocellular paraventricular nucleus of stressed SHRs compared to WKY or SD rats. These data show that chronic elevation in sympathetic activity, present in SHRs, is associated with hyperreactiveness of the paraventricular and Barrington's nucleus including recruitment of neurons to express CRF, and may have important implications for the response of the hypothalamo–pituitary–adrenal axis during stress." @default.
- W2034389873 created "2016-06-24" @default.
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- W2034389873 date "1999-02-01" @default.
- W2034389873 modified "2023-10-18" @default.
- W2034389873 title "Hypertensive rats exhibit heightened expression of corticotropin-releasing factor in activated central neurons in response to restraint stress" @default.
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- W2034389873 doi "https://doi.org/10.1016/s0169-328x(98)00342-8" @default.
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