Cell–matrix and matrix–matrix interactions are of critical
importance in regulating the development,
maintenance and repair of articular cartilage. In this study, we examined the
structural colocalisation of type
VI collagen and fibronectin in isolated chondrons and long-term agarose
cultured chondrocytes extracted
from normal adult canine articular cartilage. Using double labelling
immunohistochemistry in conjunction
with dual channel confocal microscopy and digital image processing we
demonstrate that type VI collagen
and fibronectin are distributed in a similar staining pattern and are
colocalised at the surface of cultured
chondrocytes and isolated chondrons. The results suggest that type VI collagen
and fibronectin may play a
role in both cell–matrix adhesion and matrix–matrix cohesion in the
pericellular microenvironment
surrounding articular cartilage chondrocytes.