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Schwab, W. et al.

Characterisation of caveolins from cartilage: expression of caveolin-1, -2 and -3 in chondrocytes and in alginate cell culture of the rat tibia.

This study was performed to determine if rat articular chondrocytes express caveolin, the structural protein of caveolae, and to determine differences in the distribution of the caveolin subtypes 1, 2 and 3 in knee joints of newborn and adult rats. All three subtypes of caveolin were detected in adult cartilage by immunocytochemical staining. In newborn rats, only caveolin-1 was found in the hyaline cartilage. Caveolin-1, -2 and -3 messenger RNA and protein were also detected in chondrocyte cell cultures. Ultrastructural investigations of cell culture and cartilage tissue revealed the presence of caveolae at the plasma membrane of chondrocytes. These findings represent the first report on the different expression of caveolin isoforms, in particular the expression of the muscle cell-specific caveolin-3 in chondrocytes. There is evidence that caveolin-2 and -3 are upregulated during growth and development of articular cartilage, suggesting a role for caveolins in chondrocyte differentiation.[1]

References

Characterisation of caveolins from cartilage: expression of caveolin-1, -2 and -3 in chondrocytes and in alginate cell culture of the rat tibia. Schwab, W., Galbiati, F., Volonte, D., Hempel, U., Wenzel, K.W., Funk, R.H., Lisanti, M.P., Kasper, M. Histochem. Cell Biol. (1999) [Pubmed]

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