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TitleInhibition of the chemokine (C-C motif) ligand 2/chemokine (C-C motif) receptor 2 pathway attenuates hyperglycaemia and inflammation in a mouse model of hepatic steatosis and lipoatrophy
Publication TypeJournal Article
Year of Publication2009
AuthorsYang, S. J., IglayReger H. B., Kadouh H. C., & Bodary P. F.
JournalDiabetologia
Volume52
Issue5
Pagination972 - 981
Date Published2009/05//
ISBN Number1432-0428
KeywordsAdipose Tissue, Animals, Body Weight, Chemokine CCL2, Diabetes Mellitus, Experimental, Diabetes Mellitus, Lipoatrophic, Disease Models, Animal, Fatty Liver, Female, Hyperglycemia, Inflammation, Insulin Resistance, Liver, Macrophages, Male, Mice, Mice, Inbred Strains, Mice, Transgenic, Organ Size, Receptors, CCR2, Transcription Factors
Abstract

Using a mouse model of lipoatrophic diabetes, we hypothesised that the chemokine (C-C motif) ligand 2 (CCL2)/chemokine (C-C motif) receptor 2 (CCR2) pathway contributes to hepatic macrophage accumulation and insulin resistance through induction of a chronic inflammatory state.Metabolic variables of insulin resistance and inflammation were characterised in wild-type and lipoatrophic A-ZIP/F-1 transgenic (AZIP-Tg) mice. The AZIP-Tg mice were then treated with a CCR2 antagonist (RS504393, 2 mg kg(-1) day(-1)) or vehicle for 28 days via a subcutaneous mini-osmotic pump to examine the role of the CCL2/CCR2 pathway in lipoatrophic diabetes.
The lipoatrophic AZIP-Tg mice were diabetic with high fasting glucose and serum insulin concentrations compared with littermate controls. The livers of AZIP-Tg mice were more than threefold enlarged and exhibited increased triacylglycerol content. CCL2 levels were highly elevated in both liver and serum of the AZIP-Tg mice compared with controls. In addition, the circulating CCL2 concentration was associated with increased macrophage accumulation and inflammation as documented by upregulation of Cd68 gene and Tnf-alpha [also known as Tnf] gene in livers from the AZIP-Tg mice. Treatment of the lipoatrophic AZIP-Tg mice with the CCR2 antagonist ameliorated the hyperglycaemia, hyperinsulinaemia and hepatomegaly in conjunction with a reduction in liver inflammation.
These findings demonstrate a significant role of the CCL2/CCR2 pathway in lipoatrophy-induced diabetes and provide clear evidence that metabolic improvements resulting from the inhibition of this inflammatory pathway are not adipose tissue-dependent.

URLhttp://www.ncbi.nlm.nih.gov/pubmed/19277603

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