Leptin in the Anterior Piriform Cortex Affects Food Intake in Rats

J. Ernie Blevins, Peter J Havel, J. Lee Beverly, Dorothy W. Gietzen

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Leptin administered intracerebroventricularly (ICV) or intrahypothalamically inhibits food intake (FI), however, to ourknowledge the effects of leptin administration have only been examined in one extrahypothalamic site (dorsal raphe nucleus). Our objectives were to (1) determine the FI effects of leptin administration into the anterior piriform cortex (APC), an area linked to the control of FI in amino acid (AA) deficiency, (2) examine leptin action during short term anorexia that develops in response to AA deficiency. Bilateral injections of leptin (0.25 μg) into the APC suppressed FI of a balanced diet between 6 and 12 h by 36% (p < 0.01) and over the first 12 and 24 h by 15% (p < 0.05). Bilateral administration of leptin (0.1 μg) inhibited FI between 12 and 24 h by approximately 48% (p < 0.05) on a threonine-imbalanced diet without significantly affecting FI on a threonine-corrected diet. The increase of plasma leptin concentrations in response to feeding a threonine-basal diet was greater than that following an AA imbalanced diet, suggesting that suppression of FI by an AA imbalanced diet is not mediated by an increase of leptin. Our results suggest that (1) administration of leptin into a brain area outside the hypothalamus suppresses FI, and (2) leptin is unlikely to play a selective role in the short term anorectic response to AA deficiency. These data are consistent with the hypothesis that endogenous leptin can act within the APC to modulate FI.

Original languageEnglish (US)
Pages (from-to)357-367
Number of pages11
JournalNutritional Neuroscience
Volume2
Issue number5
StatePublished - 1999

Keywords

  • Amino acid imbalance
  • Appetite regulation
  • Extrahypothalamic
  • Rat

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Neuroscience(all)
  • Food Science

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    Blevins, J. E., Havel, P. J., Beverly, J. L., & Gietzen, D. W. (1999). Leptin in the Anterior Piriform Cortex Affects Food Intake in Rats. Nutritional Neuroscience, 2(5), 357-367.