Extracellular MRP8/14 is a regulator of β22 integrin-dependent neutrophil slow rolling and adhesion

Monika Pruenster, Angela R.M. Kurz, Kyoung Jin Chung, Xiao Cao-Ehlker, Stephanie Bieber, Claudia F. Nussbaum, Susanne Bierschenk, Tanja K. Eggersmann, Ina Rohwedder, Kristina Heinig, Roland Immler, Markus Moser, Uwe Koedel, Sandra Gran, Rodger P. McEver, Dietmar Vestweber, Admar Verschoor, Tomas Leanderson, Triantafyllos Chavakis, Johannes RothThomas Vogl, Markus Sperandio*

*Corresponding author for this work
145 Citations (Scopus)

Abstract

Myeloid-related proteins (MRPs) 8 and 14 are cytosolic proteins secreted from myeloid cells as proinflammatory mediators. Currently, the functional role of circulating extracellular MRP8/14 is unclear. Our present study identifies extracellular MRP8/14 as an autocrine player in the leukocyte adhesion cascade. We show that E-selectin-PSGL-1 interaction during neutrophil rolling triggers Mrp8/14 secretion. Released MRP8/14 in turn activates a TLR4-mediated, Rap1-GTPase-dependent pathway of rapid β 22 integrin activation in neutrophils. This extracellular activation loop reduces leukocyte rolling velocity and stimulates adhesion. Thus, we identify Mrp8/14 and TLR4 as important modulators of the leukocyte recruitment cascade during inflammation in vivo.

Original languageEnglish
Article number6915
JournalNature Communications
Volume6
ISSN1751-8628
DOIs
Publication statusPublished - 20.04.2015

Funding

We thank Nadine Schmidt for technical assistance. This work was supported by Deutsche Forschungsgemeinschaft DFG - CRC914, project A1 (MM), B1 (MS) and B4 (AV), the EU-Project TARKINAID FP7-Health.2011.1.4.5 #282095 (MS), the European Research Council (281296-ENDHOMRET to TC), by Grants from the Interdisciplinary Center of Clinical Research of the University of Muenster (Vo2/014/09 and Ro2/003/15) and CRC 1009 B8 and B9 to T.V. and J.R, from the E-RARE2 Program Treat-AID to J.R. and by the Federal Ministry of Education and Research (BMBF), project AID-NET to J.R.

Research Areas and Centers

  • Academic Focus: Center for Infection and Inflammation Research (ZIEL)

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