CTLA-4 directly inhibits osteoclast formation.

Abstract:

:CTLA-4 is a regulator of co-stimulation and inhibits the activation of T cells through interfering with the interaction of CD80/86 on antigen-presenting cells with CD28 on T cells. CTLA-4 binds to the surface of antigen-presenting cells, such as dendritic cells and monocytes through CD80/86. Monocytes can differentiate in osteoclasts, the primary bone resorbing cells. Herein, we investigated whether the binding of CTLA-4 affects the differentiation of monocytes into osteoclasts in vitro and vivo. We show that CTLA-4 dose-dependently inhibits RANKL- as well as tumour necrosis factor (TNF)-mediated osteoclastogenesis in vitro without the presence of T cells. Furthermore, CTLA-4 was effective in inhibiting TNF-induced osteoclast formation in a non-T cell dependent TNF-induced model of arthritis as well as the formation of inflammatory bone erosion in vivo. These data suggest that CTLA-4 is an anti-osteoclastogenic molecule that directly binds osteoclast precursor cells and inhibits their differentiation. These findings are an attractive explanation for the anti-erosive effect of abatacept, a CTLA-4 immunoglobulin fusion protein used for the treatment of rheumatoid arthritis.

journal_name

Ann Rheum Dis

authors

Axmann R,Herman S,Zaiss M,Franz S,Polzer K,Zwerina J,Herrmann M,Smolen J,Schett G

doi

10.1136/ard.2007.080713

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

1603-9

issue

11

eissn

0003-4967

issn

1468-2060

pii

ard.2007.080713

journal_volume

67

pub_type

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