Acute food deprivation and chronic food restriction differentially affect hypothalamic NPY mRNA expression

Sheng Bi, Benjamin M. Robinson, Timothy H. Moran

Research output: Contribution to journalArticle

Abstract

Although acute food deprivation and chronic food restriction both result in body weight loss, they produce different metabolic states. To evaluate how these two treatments affect hypothalamic peptide systems involved in energy homeostasis, we compared patterns of hypothalamic neuropeptide Y (NPY), agouti-related protein (AgRP), proopiomelanocotin (POMC), and leptin receptor gene expression in acutely food-deprived and chronically food-restricted rats. Both acute food deprivation and chronic food restriction reduced body weight and circulating leptin levels and resulted in increased arcuate NPY and decreased arcuate POMC gene expression. Arcuate AgRP mRNA levels were only elevated in acutely deprived rats. NPY gene expression was increased in the compact subregion of the dorsomedial hypothalamus (DMH) in response to chronic food restriction, but not in response to acute food deprivation. Leptin receptor expression was not affected by either treatment. Double in situ hybridization histochemistry revealed that, in contrast to the situation in the arcuate nucleus, NPY and leptin receptor mRNA-expressing neurons were not colocalized in the DMH. Together, these data suggest that arcuate and DMH NPY gene expression are differentially regulated. DMH NPY-expressing neurons do not appear to be under the direct control of leptin signaling.

Original languageEnglish (US)
Pages (from-to)R1030-R1036
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume285
Issue number5 54-5
StatePublished - Nov 1 2003

Keywords

  • Agouti-related protein
  • In situ hybridization
  • Leptin
  • Leptin receptor
  • Proopiomelanocortin

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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