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• W2019101304 abstract "The role of afferent innervation to the hypothalamic paraventricular nucleus (PVN) on CRH mRNA and CRH receptor mRNA levels was studied in control and stressed rats. Groups of rats were subjected to unilateral transection of the stria terminalis (ST), the medial forebrain bundle at the rostral hypothalamic level (RMFB), or the lower brainstem through the medulla oblongata between the obex and the locus coeruleus (CBs). Twelve days after surgery, each group of rats was further divided into controls (basal conditions) and stressed (1 h immobilization), before collecting brains for mRNA analysis by in situ hybridization histochemistry. While ST and RMFB cuts had no effect on basal CRH mRNA levels in the PVN, CBs cut decreased CRH mRNA in the PVN ipsilaterally to the knife cut but it was without effect on the contralateral side (-40% and -37% vs contralateral and sham-operated, respectively, P < 0.01). Acute stress (rats were killed 3 h after immobilization) increased CRH mRNA levels by about 30% bilaterally, an effect which was unchanged by any of the three hemisections. Under basal conditions, CRH receptor mRNA levels in the PVN were indistinguishable from the surrounding areas in sham-operated controls, ST and RMFB operated rats. However, brainstem hemisection resulted in clear expression of CRH receptor mRNA in areas consistent with the dorsal, medial-ventral and lateral parvicellular subdivisions of the PVN, ipsilateral to the transection. CRH neurons in these subdivisions project to the lower brainstem and the spinal cord. Expression of CRH receptor mRNA in the medial-dorsal and anterior parvicellular divisions (CRH neurons with median eminence projections) was not affected by CBs cut. In these subdivisions, immobilization stress markedly increased CRH receptor mRNA levels but it did not influence CBs cut-induced CRH receptor expression. ST and RMFB hemisections were without effect on PVN CRH receptor mRNA levels under basal or stress conditions. Oxytocin (OT) and vasopressin (VP) mRNA levels in the magnocellular subdivision of the PVN were unchanged after immobilization, or following ST, RMFB or CBs cuts, whereas OT mRNA in the medial-ventral and caudal parvicellular subdivisions was decreased by 52% after CBs cut. The data demonstrate that: 1) basal CRH mRNA levels in the PVN are under tonic stimulatory influence of the lower brainstem (and/or spinal cord) afferents; 2) CRH receptor mRNA expression in PVN subdivisions (pituitary vs lower brainstem/spinal cord projecting neurons) is under different control mechanisms, and 3) immobilization-induced changes in CRH mRNA and CRH receptor mRNA levels are mediated either by neural inputs from brain areas other than those investigated here, or by humoral factors." @default.
• W2019101304 created "2016-06-24" @default.
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• W2019101304 date "1996-02-01" @default.
• W2019101304 modified "2023-10-03" @default.
• W2019101304 title "Neural Regulation of Corticotropin Releasing Hormone (CRH) and CRH Receptor mRNA in the Hypothalamic Paraventricular Nucleus in the Rat" @default.
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• W2019101304 doi "https://doi.org/10.1111/j.1365-2826.1996.tb00830.x" @default.
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