15 research outputs found
Inhibitor of apoptosis proteins, NAIP, cIAP1 and cIAP2 expression during macrophage differentiation and M1/M2 polarization
Monocytes and macrophages constitute the first line of defense of the immune system
against external pathogens. Macrophages have a highly plastic phenotype depending on
environmental conditions; the extremes of this phenotypic spectrum are a pro-inflammatory
defensive role (M1 phenotype) and an anti-inflammatory tissue-repair one (M2 phenotype).
The Inhibitor of Apoptosis (IAP) proteins have important roles in the regulation of several cellular
processes, including innate and adaptive immunity. In this study we have analyzed the
differential expression of the IAPs, NAIP, cIAP1 and cIAP2, during macrophage differentiation
and polarization into M1 or M2. In polarized THP-1 cells and primary human macrophages,
NAIP is abundantly expressed in M2 macrophages, while cIAP1 and cIAP2 show
an inverse pattern of expression in polarized macrophages, with elevated expression levels
of cIAP1 in M2 and cIAP2 preferentially expressed in M1. Interestingly, treatment with the
IAP antagonist SMC-LCL161, induced the upregulation of NAIP in M2, the downregulation
of cIAP1 in M1 and M2 and an induction of cIAP2 in M1 macrophages.This work was supported by Universidad
de Granada, Plan Propio 2015;#P3B: FAM, VMC
(http://investigacion.ugr.es/pages/planpropio/2015/
resoluciones/p3b_def_28072015); Universidad
de Granada CEI BioTic;#CAEP2-84: VMC (http://
biotic.ugr.es/pages/resolucionprovisional
enseaanzapractica22demayo/!); and Canadian nstitutes of Health Research;#231421, #318176,
#361847: STB, ECL, RK (http://www.cihr-irsc.gc.
ca/e/193.html). The funders had no role in study
design, data collection and analysis, decision to
publish, or preparation of the manuscript