BRAF splice variants in rheumatoid arthritis synovial fibroblasts activate MAPK through CRAF.

Abstract:

:Rheumatoid arthritis (RA) is a destructive polyarthritis in which synovial-like fibroblasts (SFs) invade and erode cartilage by expressing membrane-anchored type 1 matrix metalloproteinase (MT1-MMP). The mitogen activated protein kinase (MAPK) pathway is activated in RA SFs, but the mechanism of activation is unknown. Here we identify aberrant BRAF splice variants with deletions in both the kinase domain and RAS-binding domain (RBD) in SFs from the majority of RA patients and show that these BRAF splice variants constitutively activate MAPK through CRAF, increase expression of MT1-MMP, and enhance fibroblast invasion of collagen.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Weisbart RH,Chan G,Li E,Farmani N,Heinze E,Rubell A,Nishimura RN,Colburn K

doi

10.1016/j.molimm.2013.02.001

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

247-52

issue

3-4

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(13)00039-4

journal_volume

55

pub_type

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