α-1-Antitrypsin and IFN-γ reduce the severity of IC-mediated vasculitis by regulation of leukocyte recruitment in vivo

The Journal of Investigative Dermatology
Micha FeldMartin Steinhoff

Abstract

IC-mediated vasculitis (ICV) can be life threatening. The cellular and immune mechanisms controlling ICV are poorly understood. Therefore, we investigated the role of α-1-antitrypsin (α1AT) and IFN-γ in reducing the severity of ICV in a mouse model in vivo. To induce ICV, mice were challenged with the reverse passive Arthus reaction (RPA), the prototypic in vivo model for leukocytoclastic vasculitis (LcV), and the modulation of vascular permeability, edema formation, and leukocyte recruitment was studied. To further analyze the dynamics of RPA, we applied intravital microscopy in the dorsal skinfold chamber. α1AT continuously led to reduced leukocyte recruitment. α1AT interfered with neutrophil recruitment through a KC-dependent mechanism and reduced KC-elicited neutrophil activation. In contrast to α1AT, IFN-γ-reduced leukocyte recruitment during RPA was clearly independent of KC. We also revealed that the recruitment of neutrophils during RPA was a prerequisite for full KC expression. Thus, therapeutic administration of α1AT and IFN-γ might be beneficial for limiting the duration and severity of ICV.

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Citations

Jul 15, 2015·The Journal of Experimental Medicine·Carina HillgruberTobias Goerge
Oct 12, 2013·Experimental Dermatology·Annika Kathrin SteingräberTobias Goerge
Jun 15, 2016·Stem Cells·Dongsheng JiangKarin Scharffetter-Kochanek
Mar 29, 2014·The Journal of Immunology : Official Journal of the American Association of Immunologists·Daisuke YamadaShinichi Sato

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