Authors: Nathalie Esser Laurent L’homme Arnaud De Roover Laurent Kohnen André J Scheen Michel Moutschen Jacques Piette Sylvie LegrandPoels Nicolas Paquot
Publish Date: 2013/09/07
Volume: 56, Issue: 11, Pages: 2487-2497
Abstract
Obesity is a heterogeneous condition comprising both individuals who remain metabolically healthy MHO and those who develop metabolic disorders metabolically unhealthy MUO Adipose tissue is also heterogeneous in that its visceral component is more frequently associated with metabolic dysfunction than its subcutaneous component The development of metabolic disorders is partly mediated by the NLR family pyrin domain containing3 NLRP3 inflammasome which increases the secretion of inflammatory cytokines via activation of caspase1 We compared the immunological profile and NLRP3 activity in adipose tissue between MUO and MHO individualsMHO and MUO phenotypes were defined respectively as the absence and the presence of the metabolic syndrome Cellular composition and intrinsic inflammasome activity were investigated by flow cytometry quantitative RTPCR and tissue culture studies in subcutaneous and visceral adipose tissue from 23 MUO 21 MHO and nine lean individualsWe found significant differences between the three study groups including an increased secretion of IL1β increased expression of IL1B and NLRP3 increased number of adipose tissue macrophages and decreased number of regulatory T cells in the visceral adipose tissue of MUO patients compared with MHO and lean participants In macrophages derived from visceral adipose tissue both caspase1 activity and IL1β levels were higher in MUO patients than in MHO patients Furthermore caspase1 activity was higher in CD11c+CD206+ adipose tissue macrophages than in CD11c−CD206+ cells
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