Document Detail

Expression of membrane-bound peptidases (CD10 and CD26) on human articular chondrocytes. Possible role of neuropeptidases in the pathogenesis of osteoarthritis.
MedLine Citation:
PMID:  7656459     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To evaluate the cell surface expression of cell membrane-bound peptidases CD10 and CD26 on osteoarthritic (OA) chondrocytes, correlating it with the cell cycle phase and with the severity of OA lesions found in different load zones of the cartilage from human knees. METHODS: Chondrocytes freshly isolated from three different load zones of cartilage, obtained from 10 OA patients undergoing surgical knee replacement, were analyzed for the expression of CD10 and CD26 and for their cell cycle phase by flow cytometry. Statistical analysis was carried out using the multifactorial analysis of the variance with the LSD (least square difference) range test. The Chi square test was used to compare the cell cycle phases. RESULTS: Analysis of the chondrocyte cell cycle showed a significantly high proportion of cells in the S-phase in the maximum load zone in comparison with the minimum load zone (p < 0.001); the percentage of resting cells (G0/G1 phase) was significantly higher in the minimum load zone than in the maximum load zone (p < 0.001). The expression of CD10 and CD26 on chondrocytes was significantly reduced in the maximum load zone of the cartilage and was directly related to the progressive worsening of osteoarthritic lesions. CONCLUSIONS: These data demonstrate, for the first time, that articular chondrocytes express on their surface CD10 and CD26 peptidases. Neprilysin (CD10) and dipeptidyl peptidase IV (CD26) have been shown to play a specific role in the control of growth and differentiation of many cell types by cleaving growth factors able to promote cellular proliferation. Our results indicate that CD10 and CD26 are down-regulated in the maximum load zone of the knee OA cartilage: this condition may allow the increase of local levels of growth factors causing chondrocyte activation. Furthermore, as CD26 mediates cell binding to fibronectin and collagen, its reduction in osteoarthritic cartilage may reflect a perturbation of chondrocyte interactions with the extracellular matrix.
G Lapadula; F Iannone; C Zuccaro; M Covelli; V Patella; G Lobianco; V Pipitone
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  Clinical and experimental rheumatology     Volume:  13     ISSN:  0392-856X     ISO Abbreviation:  Clin. Exp. Rheumatol.     Publication Date:    1995 Mar-Apr
Date Detail:
Created Date:  1995-10-02     Completed Date:  1995-10-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8308521     Medline TA:  Clin Exp Rheumatol     Country:  ITALY    
Other Details:
Languages:  eng     Pagination:  143-8     Citation Subset:  IM    
Cattedra di Reumatologia, Università degli Studi di Bari, Italy.
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MeSH Terms
Antigens, CD26 / metabolism*
Cartilage, Articular / enzymology*,  immunology,  pathology
Cell Cycle
Cell Membrane / enzymology,  immunology
Middle Aged
Models, Biological
Neprilysin / metabolism*
Osteoarthritis / enzymology*,  etiology,  pathology
Reg. No./Substance:
EC, CD26; EC

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