A key role for G-CSF-induced neutrophil production and trafficking during inflammatory arthritis.

Abstract:

:We have previously shown that G-CSF-deficient (G-CSF(-/-)) mice are markedly protected from collagen-induced arthritis (CIA), which is the major murine model of rheumatoid arthritis, and now investigate the mechanisms by which G-CSF can promote inflammatory disease. Serum G-CSF levels were significantly elevated during CIA. Reciprocal bone marrow chimeras using G-CSF(-/-), G-CSFR(-/-), and wild-type (WT) mice identified nonhematopoietic cells as the major producers of G-CSF and hematopoietic cells as the major responders to G-CSF during CIA. Protection against CIA was associated with relative neutropenia. Depletion of neutrophils or blockade of the neutrophil adhesion molecule, Mac-1, dramatically attenuated the progression of established CIA in WT mice. Intravital microscopy of the microcirculation showed that both local and systemic administration of G-CSF significantly increased leukocyte trafficking into tissues in vivo. G-CSF-induced trafficking was Mac-1 dependent, and G-CSF up-regulated CD11b expression on neutrophils. Multiphoton microscopy of synovial vessels in the knee joint during CIA revealed significantly fewer adherent Gr-1(+) neutrophils in G-CSF(-/-) mice compared with WT mice. These data confirm a central proinflammatory role for G-CSF in the pathogenesis of inflammatory arthritis, which may be due to the promotion of neutrophil trafficking into inflamed joints, in addition to G-CSF-induced neutrophil production.

journal_name

Blood

journal_title

Blood

authors

Eyles JL,Hickey MJ,Norman MU,Croker BA,Roberts AW,Drake SF,James WG,Metcalf D,Campbell IK,Wicks IP

doi

10.1182/blood-2008-02-139535

subject

Has Abstract

pub_date

2008-12-15 00:00:00

pages

5193-201

issue

13

eissn

0006-4971

issn

1528-0020

pii

blood-2008-02-139535

journal_volume

112

pub_type

杂志文章

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