Participation of the urokinase receptor in neutrophil efferocytosis.

Abstract:

:The urokinase receptor (uPAR) plays an important role in regulation of fibronolysis, cell migration, and adhesion. In this study, we examined whether uPAR plays a role in modulating efferocytosis of neutrophils. Macrophages from uPAR(-/-) mice demonstrated enhanced ability to engulf viable wild-type (WT) neutrophils in vitro and in vivo in the lungs. The increased phagocytic activity of uPAR(-/-) macrophages was abrogated by incubation with soluble uPAR (suPAR), arginine-glycine-aspartic acid (RGD)-containing peptides, or anti-integrin antibodies. There was increased uptake of viable uPAR(-/-) neutrophils by WT macrophages. Incubation of uPAR(-/-) neutrophils with suPAR or anti-integrin antibodies diminished uptake by WT macrophages to baseline. Uptake of uPAR(-/-) neutrophils by uPAR(-/-) macrophages was not enhanced. However, incubation of uPAR(-/-) neutrophils or uPAR(-/-) macrophages, but not both, with suPAR enhanced the uptake of viable uPAR(-/-) neutrophils by uPAR(-/-) macrophages. The adhesion of WT neutrophils to uPAR(-/-) macrophages was higher than to WT macrophages. uPAR(-/-) neutrophils demonstrated increased adhesion to suPAR, which was abrogated by blocking of low-density lipoprotein related protein and integrins. Expression of uPAR on the surface of apoptotic neutrophils was reduced compared with levels on viable neutrophils. These results demonstrate a novel role for uPAR in modulating recognition and clearance of neutrophils.

journal_name

Blood

journal_title

Blood

authors

Park YJ,Liu G,Tsuruta Y,Lorne E,Abraham E

doi

10.1182/blood-2008-12-193524

subject

Has Abstract

pub_date

2009-07-23 00:00:00

pages

860-70

issue

4

eissn

0006-4971

issn

1528-0020

pii

blood-2008-12-193524

journal_volume

114

pub_type

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