Metabolic responses to leptin in obese db/db mice are strain dependent

Ruth B.S. Harris, Tiffany D. Mitchell, Xiaolang Yan, Jacob S. Simpson, Stephen M. Redmann

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

Obese, diabetic C57BL/Ks db/db mice that lack the long-form leptin receptor exhibit no decrease in body weight or food intake when treated with leptin. Here we compared responses to leptin in two strains of db/db mice: C57BL/6J mice that are hyperglycemic and hyperinsulinemic and C57BL/Ks that are hyperglycemic and normo- or hypoinsulinemic. Chronic intraperitoneal infusion of 10 μg leptin/day partially reversed hyperglycemia in C57BL/6J male mice but exaggerated the diabetic state of female mice. Bolus intraperitoneal injections of 40 μg leptin/day did not effect glucose in either strain of male db/db mice, whereas chronic intraperitoneal infusion of 20 μg leptin/day significantly reduced fasting blood glucose in male mice from both strains, especially C57BL/6J mice. Food intake, body weight, rectal temperature, and body fat did not change. Chronic intraperitoneal infusion of 10 μg leptin/day significantly reduced body fat in lean db/ + C57BL/6J but not in C57BL/Ks mice. Thus peripherally administered leptin is active in mice that have only short-form leptin receptors, and the response is dependent on the method of leptin administration and the background strain.

Original languageEnglish (US)
Pages (from-to)R115-R132
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume281
Issue number1 50-1
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • Body fat
  • Fasting glucose
  • Glucose tolerance

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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