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Human IL6 enhances leptin action in mice.

M Sadagurski1, L Norquay, J Farhang

  • 1Howard Hughes Medical Institute, Division of Endocrinology, Children's Hospital Boston, Harvard Medical School, Karp Family Research Laboratories, Rm 4210, 300 Longwood Avenue, Boston, MA 02115, USA.

Diabetologia
|November 11, 2009
PubMed
Summary

Sustained human Interleukin-6 (IL6) in mice improved insulin sensitivity and prevented diet-induced obesity by enhancing central leptin action. This suggests IL6 plays a key role in nutrient homeostasis.

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Area of Science:

  • Metabolism and Endocrinology
  • Inflammation and Immunology

Background:

  • Interleukin-6 (IL6) is an inflammatory cytokine impacting nutrient homeostasis.
  • While IL6 is linked to obesity and insulin resistance, it can also boost energy expenditure and improve glucose control.

Purpose of the Study:

  • To investigate the effects of sustained circulating human IL6 (hIL6) on nutrient homeostasis in mice.
  • To determine if hIL6 influences obesity and insulin sensitivity, particularly in the context of a high-fat diet.

Main Methods:

  • Utilized genetically modified C57BL/6J mice (hIL6(tg)) with sustained hIL6 secretion from brain and lung.
  • Assessed nutrient homeostasis, insulin sensitivity, body weight, energy expenditure, and food consumption on standard and high-fat diets.
  • Investigated the impact of leptin injections on obese mice (ob/ob and ob/ob (IL6) mice) and measured hypothalamic signaling.

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Main Results:

  • hIL6(tg) mice showed no systemic inflammation and enhanced insulin sensitivity compared to wild-type.
  • On a high-fat diet, hIL6(tg) mice were leaner, had lower leptin, reduced food intake, and higher energy expenditure.
  • Leptin effectively improved activity, reduced weight and food intake in ob/ob (IL6) mice, and increased hypothalamic STAT3 phosphorylation, unlike in ob/ob mice.

Conclusions:

  • Sustained human IL6 enhances central leptin action in mice.
  • This enhancement promotes improved nutrient homeostasis and protection against diet-induced obesity.
  • IL6 plays a crucial role in regulating energy balance and metabolic health via central mechanisms.