Leptin action is modified by an interaction between dietary fat content and ambient temperature

Andrea L. Haltiner, Tiffany D. Mitchell, Ruth B.S. Harris

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Mice adapted to a high-fat diet are reported to be leptin resistant; however, we previously reported that mice fed a high-fat (HF) diet and housed at 23°C remained sensitive to peripheral leptin and specifically lost body fat. This study tested whether leptin action was impaired by a combination of elevated environmental temperature and a HF diet. Male C57BL/6 mice were adapted to low-fat (LF) or HF diet from 10 days of age and were housed at 27°C from 28 days of age. From 35 days of age, baseline food intake and body weight were recorded for 1 wk and then mice on each diet were infused with 10 μg leptin/day or PBS from an intraperitoneal miniosmotic pump for 13 days. HF-fed mice had a higher energy intake than LF-fed mice and were heavier but not fatter. Serum leptin was lower in PBS-infused HF- than LF-fed mice. Leptin significantly inhibited energy intake of both LF-fed and HF-fed mice, and this was associated with a significant increase in hypothalamic long-form leptin receptors with no change in short-form leptin receptor or brown fat uncoupling protein-1 mRNA expression. Leptin significantly inhibited weight gain in both LF- and HF-fed mice but reduced the percentage of body fat mass only in LF-fed mice. The percentage of lean and fat tissue in HF-fed mice did not change, implying that overall growth had been inhibited. These results suggest that dietary fat modifies the mechanisms responsible for leptin-induced changes in body fat content and that those in HF-fed mice are sensitive to environmental temperature.

Original languageEnglish (US)
Pages (from-to)R1250-R1255
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume287
Issue number5 56-5
DOIs
StatePublished - Nov 1 2004
Externally publishedYes

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Keywords

  • Growth
  • Mice
  • Peripheral leptin

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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