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RU486 blocks fasting-induced decrease of neuronal nitric oxide synthase in the rat paraventricular nucleus

 Yun Mi Kim  ;  Joo Young Lee  ;  Jeong Won Jahng  ;  Dong Goo Kim  ;  Si Ho Choi 
 BRAIN RESEARCH, Vol.1018(2) : 221-226, 2004 
Journal Title
Issue Date
Animals ; Cyclic AMP Response Element-Binding Protein/metabolism ; Down-Regulation ; Fasting/physiology* ; Food Deprivation/physiology ; Hormone Antagonists/pharmacology ; Immunohistochemistry ; Male ; Mifepristone/pharmacology* ; Neurons/enzymology ; Nitric Oxide Synthase/metabolism* ; Nitric Oxide Synthase Type I ; Paraventricular Hypothalamic Nucleus/cytology ; Paraventricular Hypothalamic Nucleus/enzymology* ; Rats ; Rats, Sprague-Dawley ; Receptors, Glucocorticoid/antagonists & inhibitors*
Food deprivation ; Glucocorticoid ; CREB phosphorylation ; Gene expression ; Promoter
It has been reported that food deprivation decreases expression of neuronal nitric oxide synthase (nNOS) in the hypothalamic paraventricular nucleus (PVN). Food deprivation produces autonomic changes and the PVN nitric oxide has been suggested to be involved in regulation of autonomic functions. In order to understand the molecular mechanism by which food deprivation decreases nNOS expression in the PVN, we examined if plasma glucocorticoids, which reported to be elevated during food deprivation, mediates the fasting-induced down-regulation of the PVN-nNOS. Male Sprague–Dawley rats underwent 48 h of food deprivation, but not water deprivation, with/without subcutaneous RU486, glucocorticoid receptor antagonist, and the brain tissues were processed for immunohistochemistry with specific antibodies against nNOS. Immunoreactivity of phosphorylated cAMP response element-binding protein (pCREB) was also examined in the PVN sections, because nNOS promoter carries cAMP response element (CRE). Food deprivation significantly decreased both nNOS and pCREB immunoreactivity (-ir) in the medial parvocellular PVN, and RU486 blocked this reduction. In the posterior magnocellular PVN, nNOS-ir, but not pCREB-ir, was decreased by food deprivation, and RU486 exerted no effect. These results suggest that glucocorticoid receptor may mediate the fasting-induced down-regulation of nNOS in the parvocellular PVN, but not in the magnocellular PVN.
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1. College of Medicine (의과대학) > Dept. of Pharmacology (약리학교실) > 1. Journal Papers
Yonsei Authors
Kim, Dong Goo(김동구)
Jahng, Jeong Won(장정원)
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