Document Detail

Nitrated type III collagen as a biological marker of nitric oxide-mediated synovial tissue metabolism in osteoarthritis.
MedLine Citation:
PMID:  19467351     Owner:  NLM     Status:  In-Process    
OBJECTIVES: Nitric oxide (NO) is a major mediator of joint tissue inflammation and damage in osteoarthritis (OA) and mediates the nitration of tyrosine (Y*) residues in proteins. We investigated the nitration of type III collagen, a major constituent of synovial membrane, in knee OA. METHODS: A polyclonal antibody directed against the nitrated QY*DSY*DVKSG sequence from type III collagen N-telopeptide was generated. Synovial tissues from patients with knee OA (n=4) and rheumatoid arthritis (RA, n=4) were analyzed by immunohistochemistry for IIINys. Serum IIINys levels were measured by enzyme-linked immunosorbent assay in 87 patients with painful knee OA (mean age: 63.0+/-8.0 years, Kellgren-Lawrence score II-III) and in 40 sex and age-matched healthy controls. RESULTS: Competition experiments using various nitrated and un-nitrated type III collagen and derived sequences, showed that the antibody was highly specific for the nitrated IIINys sequence. High IIINys immunoreactivity was detected in the synovial tissues from all patients with OA and RA with a preferential localization in the intimal layer. Serum IIINys levels were on average 1.5-fold higher (P<0.0001) in patients with knee OA than in healthy controls and significantly correlated with C-reactive protein values (r=0.40, P<0.005). CONCLUSIONS: Nitration of tyrosine residues of type III collagen N-telopeptide is increased in the synovial tissue of patients with knee OA. Measurements of serum IIINys level may be useful for the clinical investigation of oxidative-related alterations of synovial tissue metabolism in OA.
P Richardot; N Charni-Ben Tabassi; L Toh; H Marotte; A-C Bay-Jensen; P Miossec; P Garnero
Publication Detail:
Type:  Journal Article     Date:  2009-05-13
Journal Detail:
Title:  Osteoarthritis and cartilage / OARS, Osteoarthritis Research Society     Volume:  17     ISSN:  1522-9653     ISO Abbreviation:  Osteoarthr. Cartil.     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-09-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9305697     Medline TA:  Osteoarthritis Cartilage     Country:  England    
Other Details:
Languages:  eng     Pagination:  1362-7     Citation Subset:  IM    
CCBR-SYNARC, Lyon, France.
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