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We investigated the role of CRF in regulating receptor expression in the paraventricular nucleus (PVN). First, to clarify the effect of exogenously administered CRF, 1 microgram of ovine CRF was injected into rat lateral ventricle and changes in concentration of the CRF type 1 receptor (CRF1-R) and CRF mRNA in the PVN were semiquantified after in situ hybridization. Second, we determined the effect of stress, as a stimulant of endogenous CRF secretion, on mRNA accumulation. While CRF1-R mRNA expression was low to be undetectable in the PVN of controls, both intracerebroventricular administration of CRF and restraint significantly increased CRF1-R and CRF signals in the parvocellular PVN. Thus CRF may modulate CRF production and release from the PVN, by regulating CRF1-R expression.
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