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Heme oxygenase-1 is dispensable for the anti-inflammatory activity of intravenous immunoglobulin

By Caroline Galeotti, Pushpa Hegde, Mrinmoy Das, Emmanuel Stephen-Victor, Fernando Canale, Marcos Muñoz, Varun K. Sharma, Jordan D. Dimitrov, Srini V. Kaveri and Jagadeesh Bayry


International audienceIntravenous immunoglobulin G (IVIG) is used in the therapy of various autoimmune and inflammatory conditions. The mechanisms by which IVIG exerts anti-inflammatory effects are not completely understood. IVIG interacts with numerous components of the immune system including dendritic cells, macrophages, T and B cells and modulate their functions. Recent studies have reported that heme oxygenase-1 (HO-1) pathway plays an important role in the regulation of inflammatory response in several pathologies. Several therapeutic agents exert anti-inflammatory effects via induction of HO-1. Therefore, we aimed at exploring if anti-inflammatory effects of IVIG are mediated via HO-1 pathway. Confirming the previous reports, we report that IVIG exerts anti-inflammatory effects on innate cells as shown by the inhibitory effects on IL-6 and nitric oxide production and confers protection in experimental autoimmune encephalomyelitis (EAE) model. However, these effects were not associated with an induction of HO-1 either in innate cells such as monocytes, dendritic cells and macrophages or in the kidneys and liver of IVIG-treated EAE mice. Also, inhibition of endogenous HO-1 did not modify anti-inflammatory effects of IVIG. These results thus indicate that IVIG exerts anti-inflammatory effects independent of HO-1 pathway

Topics: [SDV.IMM] Life Sciences [q-bio]/Immunology
Publisher: Nature Publishing Group
Year: 2016
DOI identifier: 10.1038/srep19592
OAI identifier: oai:HAL:hal-01274079v1
Provided by: Hal-Diderot

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