Obesity-induced inflammation in white adipose tissue is attenuated by loss of melanocortin-3 receptor signaling

Kate L J Ellacott, Jonathan G. Murphy, Daniel Marks, Roger D. Cone

Research output: Contribution to journalArticle

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Abstract

Metabolic syndrome, a complex of highly debilitating disorders that includes insulin resistance, hypertension, and dyslipidemia, is associated with the development of obesity in humans as well as rodent models. White adipose tissue (WAT) inflammation, caused in part by macrophage infiltration, and fat accumulation in the liver are both linked to development of the metabolic syndrome. Despite large increases in body fat, melanocortin 3-receptor (MC3-R)-deficient mice do not get fatty liver disease or severe insulin resistance. This is in contrast to obese melanocortin 4-receptor (MC4-R)-deficient mice and diet-induced obese (DIO) mice, which show increased adiposity, fatty liver disease, and insulin resistance. We hypothesized that defects in the inflammatory response to obesity may underlie the protection from metabolic syndrome seen in MC3-R null mice. MC4-R mice fed a chow diet show increased proinflammatory gene expression and macrophage infiltration in WAT, as do wild-type (WT) DIO mice. In contrast, MC3-R-deficient mice fed a normal chow diet show neither of these inflammatory changes, despite their elevated adiposity and a comparable degree of adipocyte hypertrophy to the MC4-R null and DIO mice. Furthermore, even when challenged with high-fat chow for 4 wk, a period of time shown to induce an inflammatory response in WAT of WT animals, MC3-R nulls showed an attenuated up-regulation in both monocyte chemoattractant protein-1 (MCP-1) and TNFα mRNA in WAT compared with WT high-fat-fed animals.

Original languageEnglish (US)
Pages (from-to)6186-6194
Number of pages9
JournalEndocrinology
Volume148
Issue number12
DOIs
StatePublished - Dec 2007

Fingerprint

Receptor, Melanocortin, Type 3
White Adipose Tissue
Obesity
Obese Mice
Diet
Inflammation
Insulin Resistance
Fats
Adiposity
Fatty Liver
Liver Diseases
Macrophages
Receptor, Melanocortin, Type 4
Disease Resistance
Wild Animals
Chemokine CCL2
Dyslipidemias
Adipocytes
Hypertrophy
Adipose Tissue

ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

Cite this

Obesity-induced inflammation in white adipose tissue is attenuated by loss of melanocortin-3 receptor signaling. / Ellacott, Kate L J; Murphy, Jonathan G.; Marks, Daniel; Cone, Roger D.

In: Endocrinology, Vol. 148, No. 12, 12.2007, p. 6186-6194.

Research output: Contribution to journalArticle

Ellacott, Kate L J ; Murphy, Jonathan G. ; Marks, Daniel ; Cone, Roger D. / Obesity-induced inflammation in white adipose tissue is attenuated by loss of melanocortin-3 receptor signaling. In: Endocrinology. 2007 ; Vol. 148, No. 12. pp. 6186-6194.
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