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Journal of Histochemistry and Cytochemistry, Vol. 46, 641-652, May 1998, Copyright © 1998, The Histochemical Society, Inc.

ARTICLE

An Essential Role for the Interaction Between Hyaluronan and Hyaluronan Binding Proteins During Joint Development

Gary P. Dowthwaitea, Jo C. W. Edwardsb, and Andrew A. Pitsillidesa
a Department of Veterinary Basic Sciences, The Royal Veterinary College, University of London, London, United Kingdom
b Department of Rheumatology Research, Faculty of Clinical Sciences, University College London,, London, United Kingdom

Correspondence to: Gary P. Dowthwaite, Dept. of Veterinary Basic Sciences, The Royal Veterinary College, University of London, London NW1 0TU, UK.

We studied the expression of hyaluronan binding proteins (HABPs) during the development of embryonic chick joints, using immunocytochemistry and biotinylated HA. The expression of actin capping proteins and of actin itself was also studied because the cytoskeleton is important in controlling HA–HABP interactions. Three cell surface HABPs were localized in the epiphyseal cartilage, articular fibrocartilage, and interzone that comprise the developing joint. Of these three HABPs, CD44 was associated with the articular fibrocartilages and interzone, whereas RHAMM and the IVd4 epitope were associated with all three tissues. Biotinylated HA was localized to interzone and articular fibrocartilages before cavity formation and within epiphyseal chondrocytes post cavitation. Actin filament bundles were observed at the developing joint line, as was the expression of the actin capping protein moesin. Manipulation of joint cavity development, using oligosaccharides of HA, disrupted joint formation and was associated with decreases in CD44 and actin filament expression as well as decreased hyaluronan synthetic capability. These results suggest that HA is actively bound by CD44 at the developing joint line and that HA–HABP interactions play a major role in the initial separation events occurring during joint formation. (J Histochem Cytochem 46:641–651, 1998)

Key Words: hyaluronan, CD44, joint development, actin capping proteins, chick, immunocytochemistry


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