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Allograft inflammatory factor 1 (AIF-1) is a new human adipokine involved in adipose inflammation in obese women.

Abstract : BACKGROUND: Allograft inflammatory factor 1 (AIF-1) is a putative obesity gene. Our aim was to examine the expression of AIF-1 in human white adipose tissue (WAT) in relation to obesity and metabolic phenotypes in women. METHODS: WAT secretion of AIF-1 was determined in subcutaneous adipose tissue pieces in vitro by ELISA from 5 subjects. mRNA expression of AIF-1 was determined by RT-qPCR in the isolated cell fractions of adipose tissue (n = 5-6 per group), in subcutaneous and visceral WAT pieces from non-obese (n = 12) and obese women (n = 23), and in some subcutaneous WAT also before and after weight reduction (n = 10). Finally, adipose AIF-1 mRNA was related to metabolic phenotypes in 96 subjects with a wide range of BMI. RESULTS: AIF-1 was secreted in a time dependent fashion from WAT. The major source of AIF-1 was WAT resident macrophages. Expression of AIF-1 was similar in visceral and subcutaneous WAT and was two-fold increased in obese women (P < 0.01). AIF-1 mRNA expression levels were normalized after weight reduction (P < 0.01). Expression of AIF-1 was inversely correlated with insulin sensitivity as assessed by insulin tolerance test (KITT), and circulating levels of adiponectin (P = 0.02), and positively correlated with insulin resistance as estimated by HOMA (=0.0042). CONCLUSIONS: AIF-1 is a novel adipokine produced mainly by macrophages within human WAT. Its expression is increased in obese women and associates with unfavourable metabolic phenotypes. AIF-1 may play a paracrine role in the regulation of WAT function through cross-talk between macrophages and other cell types within the adipose tissue.
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Submitted on : Monday, December 16, 2013 - 9:05:12 PM
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Silvia Lorente-Cebrián, Pauline Decaunes, Elisabeth Dungner, Anne Bouloumié, Peter Arner, et al.. Allograft inflammatory factor 1 (AIF-1) is a new human adipokine involved in adipose inflammation in obese women.. BMC Endocrine Disorders, BioMed Central, 2013, 13 (1), pp.54. ⟨10.1186/1472-6823-13-54⟩. ⟨inserm-00919506⟩



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