DNA mismatch repair enzyme expression in synovial tissue.

Abstract:

BACKGROUND:Oxidative stress in RA synovial tissue can cause DNA damage and suppress the DNA mismatch repair (MMR) system in cultured synoviocytes. This mechanism includes two enzyme complexes, hMutSalpha (hMSH2/hMSH6) and hMutSbeta (hMSH2/hMSH3). OBJECTIVE:To examine the expression and distribution of MMR enzymes in synovial tissues from patients with arthritis and from normal subjects. METHODS:Synovial tissues from patients with RA, osteoarthritis (OA), or normal subjects were analysed by immunohistochemistry using monoclonal antibodies to hMSH2, hMSH3, and hMSH6. MMR protein expression was evaluated by computer assisted digital image analysis. RESULTS:hMSH2, hMSH3, and hMSH6 were found in most synovial tissues evaluated, with greater levels in the intimal lining than sublining regions. In RA and OA, sublining perivascular staining for hMSH6 and hMSH3 was also prominent. Significantly higher sublining expression of hMSH2, hMSH3, and hMSH6 was seen in RA and OA than in normal synovium. Double label immunohistochemistry demonstrated that the main cells expressing MMR enzymes were CD68(+) and CD68(-) cells in the intimal lining. CONCLUSIONS:DNA MMR enzyme expression is greatest in the synovial intimal lining layer, where maximal oxidative stress in RA occurs. Although MMR enzyme expression is greater in RA than in normal tissue, this compensatory response cannot overcome the genotoxic environment, and DNA damage accumulates.

journal_name

Ann Rheum Dis

authors

Simelyte E,Boyle DL,Firestein GS

doi

10.1136/ard.2003.017210

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

1695-9

issue

12

eissn

0003-4967

issn

1468-2060

pii

63/12/1695

journal_volume

63

pub_type

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