Semiquantitative reverse transcription-polymerase chain reaction analysis of syndecan-1 and -4 messages in cartilage and cultured chondrocytes from osteoarthritic joints.
OBJECTIVE
To determine the steady-state of messenger RNA (mRNA) levels of syndecan-1 and syndecan-4 in cartilage samples and chondrocytes derived from human osteoarthritic knee joints.


METHODS
Steady-state levels of gene-specific mRNA (relative to beta-actin) were measured by semiquantitative polymerase chain reaction (PCR).


RESULTS
RT-PCR allowed detection of syndecan-1 (for the first time) and syndecan-4 in both cartilage samples and articular chondrocytes cultured as primary monolayers. The mRNA levels of syndecan-1 were reduced in cartilage tissue from heavily damaged compared to normal-looking areas whereas those of syndecan-4 were significantly increased. In contrast, the expression of syndecan-1 was higher in cultured chondrocytes derived from the fibrillated osteoarthritic cartilage than in cells obtained from intact cartilage, while the syndecan-4 message levels did not differ between the two sites.


CONCLUSIONS
The expression of the cell-surface syndecans 1 and 4 is altered during the osteoarthritic degradative process of the knee joint. The discoordinate syndecan gene expression, which is probably related to the chondrocyte proliferation and clustering, may contribute to the disorganization of the cartilage and the development of OA processes. Isolation and culturing the chondrocytes as monolayers dramatically change the expression of these genes and cannot reflect the in situ condition.
Barre
P E
PE
Laboratoire de Biochimie du Tissu Conjonctif, Universit¿e de Caen, France.
Redini
F
F
Boumediene
K
K
Vielpeau
C
C
Pujol
J P
JP
D000199:Actins / Q000378:metabolism; D000368:Aged; D002478:Cells, Cultured; D019902:Chondrocytes / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008562:Membrane Glycoproteins / Q000378:metabolism*; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000378:metabolism*; D011509:Proteoglycans / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D053668:Syndecan-1; D053671:Syndecan-4; D053667:Syndecans
D000199:Actins; D008562:Membrane Glycoproteins; D011509:Proteoglycans; C508241:SDC1 protein, human; C508304:SDC4 protein, human; D053668:Syndecan-1; D053671:Syndecan-4; D053667:Syndecans