Integrin clustering drives phagocytosis coupled to collagenase 1 induction through RhoA GTPase and superoxide production.

Abstract:

:Integrin-mediated phagocytosis in fibroblasts is associated to collagenase 1 induction when the particles are coated with high-affinity binding ligands. This study shows that the high density of ligand coating on the particle elicits RhoA-dependent particle uptake coupled to signal transduction. Integrin clustering induced by anti-integrin antibodies or cell surface-binding lectins is sufficient to trigger the pathway. The GTPase RhoA is recruited in response to integrin aggregation at the plasma membrane when uptake is inhibited at 4 degrees C and is necessary for particle engulfment, as function interference with the dominant negative mutant RhoAN19, but not with RacN17, abrogates particle ingestion. Phagocytosis driven by clustering is associated with signal transduction through a transient rise in cellular hydrogen peroxide production to induce a proinflammatory cascade leading to collagenase 1 induction.

journal_name

Antioxid Redox Signal

authors

Werner E

doi

10.1089/ars.2005.7.318

keywords:

subject

Has Abstract

pub_date

2005-03-01 00:00:00

pages

318-26

issue

3-4

eissn

1523-0864

issn

1557-7716

journal_volume

7

pub_type

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