alexa Adiponectin induces TNF-alpha and IL-6 in macrophages and promotes tolerance to itself and other pro-inflammatory stimuli.
Healthcare

Healthcare

Journal of Community Medicine & Health Education

Author(s): Tsatsanis C, Zacharioudaki V, Androulidaki A, Dermitzaki E, Charalampopoulos I,

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Abstract Adiponectin exerts anti-inflammatory effects via macrophages, suppressing the production of pro-inflammatory cytokines in response to bacterial lipopolysaccharide (LPS). Here, we provide experimental evidence that the "anti-inflammatory" effect of adiponectin may be due to an induction of macrophage tolerance: globular adiponectin (gAd) is a powerful inducer of TNF-alpha and IL-6 secretion in primary human peripheral macrophages, in the THP-1 human macrophage cell line, and in primary mouse peritoneal macrophages. Pre-exposure of macrophages to 10 microg/ml gAd rendered them tolerant to further gAd exposure or to other pro-inflammatory stimuli such as TLR3 ligand polyI:C and TLR4 ligand LPS, while pre-exposure to 1 microg/ml of and re-exposure to 10 microg/ml gAd unmasked its pro-inflammatory properties. GAd induced NF-kappaB activation and tolerance to further gAd or LPS exposure. Our data suggest that adiponectin constant presence in the circulation in high levels (in lean subjects) renders macrophages resistant to pro-inflammatory stimuli, including its own. This article was published in Biochem Biophys Res Commun and referenced in Journal of Community Medicine & Health Education

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