TGFbeta is a critical regulator of SZP accumulation in both superficial zone articular chondrocytes and synoviocytes. TGFbeta and BMP have an additive effect. Synoviocytes are more sensitive to BMP family members and activins than are superficial zone articular chondrocytes. Thus, regulation of SZP accumulation by TGFbeta /BMP superfamily members is regulated differently in articular chondrocytes and synoviocytes.
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Niikura et al. (2007) studied this question.
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