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Published on: March 28, 2013

Orexin receptor-1 mediates brown fat developmental differentiation.

Dyan Sellayah1, Devanjan Sikder

  • 1Metabolic Signaling and Disease Program; Diabetes and Obesity Research Center; Sanford-Burnham Medical Research Institute; Orlando, FL USA.

Adipocyte
|May 24, 2013
PubMed
Summary

Orexin A (OX) signaling through Orexin receptor-1 (OXR1) is crucial for brown adipose tissue (BAT) function. This pathway regulates thermogenesis and prevents obesity, particularly during cold exposure.

Keywords:
brown fat developmentdiet-induced thermogenesisdifferentiationobesityorexin

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Area of Science:

  • Neuroendocrinology
  • Metabolic Regulation
  • Adipose Tissue Biology

Background:

  • Orexin A (OX) is an excitatory neuropeptide hormone regulating feeding, wakefulness, and energy expenditure through Orexin receptor-1 (OXR1) and Orexin receptor-2 (OXR2).
  • OX deficiency leads to obesity, linked to brown adipose tissue (BAT) dysfunction originating during fetal development.
  • OX-deficient mice exhibit impaired BAT thermogenesis and undifferentiated brown preadipocytes.

Purpose of the Study:

  • To investigate the role of Orexin receptor-1 (OXR1) in mediating the effects of Orexin A (OX) on brown adipose tissue (BAT) differentiation and thermogenesis.
  • To determine if OXR1 is essential for the thermoregulatory and anti-obesogenic functions of OX.

Main Methods:

  • Phenotypic analysis of Orexin A (OX)-deficient and Orexin receptor-1 (OXR1)-null mice.
  • Histological examination of brown adipose tissue (BAT) preadipocytes.
  • Assessment of diet- and cold-induced thermogenesis.
  • In vitro studies on OXR1-null preadipocytes treated with OX.

Main Results:

  • Orexin receptor-1 (OXR1)-null mice exhibited similar brown adipose tissue (BAT) differentiation defects as OX-deficient mice.
  • OXR1-null mice showed impaired diet- and cold-induced thermogenesis.
  • Orexin A (OX) failed to induce differentiation in cultured OXR1-null preadipocytes, confirming OXR1's mediating role.

Conclusions:

  • Orexin signaling via Orexin receptor-1 (OXR1) is essential for brown adipose tissue (BAT) differentiation and function.
  • This Orexin-OXR1 pathway plays a critical role in thermoregulation and defense against obesity.
  • Targeting the Orexin-OXR1 axis may offer therapeutic strategies for metabolic disorders like obesity.