Feeding behaviour in galanin knockout mice supports a role of galanin in fat intake and preference

A. C. Adams, J. C. Clapham, D. Wynick, J. R. Speakman

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

It has been widely suggested that saturated fat consumption has fuelled the current obesity epidemic. Macronutrient choices appear to be important not only as potential factors influencing obesity, but also independently as risk factors for diabetes, cardiovascular disease and cancer. The neuropeptide galanin has previously been implicated in the regulation of fat intake, although its precise role has been contested. The present study investigated mice with targeted knockout of the galanin gene (GKO). We demonstrate that, when only a high fat diet (HFD) was available, wild-type (WT) animals consumed significantly more energy than the GKO mice (89.85 +/- 4.57 kJ/day versus 76.84 +/- 3.55 kJ/day, P < 0.001, n = 17 versus 15). Consistent with this, WT animals gained more body weight when fed the HFD than GKO animals (3.48 +/- 0.44 g versus 2.02 +/- 0.62 g, P < 0.001, n = 17 versus 15). In a macronutrient choice scenario, WT mice ate almost three-fold more fat than GKO animals (0.63 +/- 0.02 g versus 0.23 +/- 0.01 g, P < 0.001, n = 18 versus 24).Chronic administration of galanin by mini-osmotic pumps into the lateral ventricle of GKO animals partially reversed the fat avoidance phenotype. Fat intake was significantly lower in the phosphate-buffered saline-treated GKO group compared to galanin-treated GKO animals (0.32 +/- 0.01 g versus 0.38 +/- 0.01 g, P < 0.005, n = 17 versus 17). These data are compatible with the hypothesis that galanin specifically regulates fat intake, and implies that an antagonist to one or more of the galanin receptor subtype(s) may be of use in the treatment of some forms of obesity.

Original languageEnglish
Pages (from-to)199-206
Number of pages8
JournalJournal of Neuroendocrinology
Volume20
Issue number2
Early online date14 Dec 2007
DOIs
Publication statusPublished - Feb 2008

Keywords

  • galanin
  • macronutrient
  • obesity
  • corticotropin-releasing-factor
  • melanin-concentrating hormone
  • central-nervous-system
  • resting metabolic-rate
  • energy homeostasis
  • receptor subtypes
  • food-intake
  • pharmacological characterization
  • macronutrient selection
  • hypothalamic galanin

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