Abstract
The expression of corticotropin releasing hormone (CRH) in the hypothalamic paraventricular nucleus (PVN) and CRH receptor mRNA in the PVN and anterior pituitary was studied during development of adjuvant-induced arthritis in Piebald-Viral-Glaxo rats, using in situ hybridization techniques. As previously shown with i.p. hypertonic saline injection, basal and immobilization stress-stimulated CRH mRNA levels in the PVN were significantly lower than in controls 14 days after adjuvant injection. However, 7 days after injection, preceding the onset of inflammation, the increase of CRH mRNA following immobilization was significantly higher than in control rats. In contrast to other chronic stress paradigms, inflammation stress failed to induce type-1 CRH receptor (CRH-R1) mRNA in the PVN, either at 7 days, or at 14 days after adjuvant injection, when inflammation is present. The ability of acute immobilization to induce CRH-R1 mRNA in the PVN was not affected 14 days after adjuvant injection but parallel to the CRH peptide mRNA response it was markedly potentiated at 7 days. Pro-opiomelanocorpin (POMC) mRNA levels in the anterior pituitary increased significantly 14 days after adjuvant injection, and they were unaffected by 1 h immob...Continue Reading
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