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 language | English |
|---|---|
| Article number | 6915 |
| Journal | Nature Communications |
| Volume | 6 |
| ISSN | 1751-8628 |
| DOIs | |
| Publication status | Published - 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)