Leptin secretion and hypothalamic neuropeptide and receptor gene expression in sheep

A Sorensen, Clare Lesley Adam, Patricia Findlay, M Marie, Louise Thomas, M T Travers, R G Vernon

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Peripheral and hypothalamic mechanisms underlying the hyperphagia of lactation have been investigated in sheep. Sheep were fed ad libitum and killed at 6 and 18 days of lactation; ad libitum-fed nonlactating sheep were killed as controls. Despite increased food intake, lactating ewes were in negative energy balance. Lactation decreased plasma leptin and adipose tissue leptin mRNA concentrations. OB-Rb gene expression, determined by in situ hybridization, was increased in the hypothalamic arcuate nucleus (ARC) and ventromedial hypothalamic nucleus (VMH) at both stages of lactation. Neuropeptide Y (NPY) was increased by lactation in both the ARC and dorsomedial hypothalamus (DMH), although increased gene expression in the DMH was only apparent at day 18 of lactation. Gene expression was decreased for cocaine- and amphetamine-regulated transcript (CART) in the ARC and VMH and for proopiomelanocortin in ARC during lactation. Agouti-related peptide gene expression was increased in the ARC, and melanocortin receptor expression was unchanged in both the ARC and VMH with lactation. Thus the hypoleptinemia of lactation may activate NPY orexigenic pathways and attenuate anorexigenic melanocortin and CART pathways in the hypothalamus to promote the hyperphagia of lactation.

Original languageEnglish
Number of pages9
JournalAmerican Journal of Physiology-Regulatory Integrative and Comparative Physiology
Volume282
Issue number4
DOIs
Publication statusPublished - Apr 2002

Keywords

  • hypothalamic neuropeptides
  • appetite
  • POLYACRYLAMIDE-GEL ELECTROPHORESIS
  • AGOUTI-RELATED PROTEIN
  • BODY-WEIGHT REGULATION
  • FATTY-ACID SYNTHESIS
  • Y MESSENGER-RNA
  • ARCUATE NUCLEUS
  • ADIPOSE-TISSUE
  • FOOD-INTAKE
  • SERUM LEPTIN
  • SUCKLING STIMULUS
  • appetite
  • SUCKLING STIMULUS

Cite this

Leptin secretion and hypothalamic neuropeptide and receptor gene expression in sheep. / Sorensen, A ; Adam, Clare Lesley; Findlay, Patricia; Marie, M ; Thomas, Louise; Travers, M T ; Vernon, R G .

In: American Journal of Physiology-Regulatory Integrative and Comparative Physiology, Vol. 282, No. 4, 04.2002.

Research output: Contribution to journalArticle

Sorensen, A ; Adam, Clare Lesley ; Findlay, Patricia ; Marie, M ; Thomas, Louise ; Travers, M T ; Vernon, R G . / Leptin secretion and hypothalamic neuropeptide and receptor gene expression in sheep. In: American Journal of Physiology-Regulatory Integrative and Comparative Physiology. 2002 ; Vol. 282, No. 4.
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AB - Peripheral and hypothalamic mechanisms underlying the hyperphagia of lactation have been investigated in sheep. Sheep were fed ad libitum and killed at 6 and 18 days of lactation; ad libitum-fed nonlactating sheep were killed as controls. Despite increased food intake, lactating ewes were in negative energy balance. Lactation decreased plasma leptin and adipose tissue leptin mRNA concentrations. OB-Rb gene expression, determined by in situ hybridization, was increased in the hypothalamic arcuate nucleus (ARC) and ventromedial hypothalamic nucleus (VMH) at both stages of lactation. Neuropeptide Y (NPY) was increased by lactation in both the ARC and dorsomedial hypothalamus (DMH), although increased gene expression in the DMH was only apparent at day 18 of lactation. Gene expression was decreased for cocaine- and amphetamine-regulated transcript (CART) in the ARC and VMH and for proopiomelanocortin in ARC during lactation. Agouti-related peptide gene expression was increased in the ARC, and melanocortin receptor expression was unchanged in both the ARC and VMH with lactation. Thus the hypoleptinemia of lactation may activate NPY orexigenic pathways and attenuate anorexigenic melanocortin and CART pathways in the hypothalamus to promote the hyperphagia of lactation.

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