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We have recently reported that retinoic acid inhibits dexamethasone-induced alkaline phosphatase activity and mineralization in human osteoblastic cell line SV-HFO. In this study, we show that this inhibitory effect on alkaline phosphatase activity depends on the stage of cell differentiation; however, expression of tetranectin, which is a recently reported bone matrix protein, was completely inhibited by treatment with retinoic acid, irrespective of the stage of cell differentiation. Similarly, mineral deposit formation in SV-HFO cells was phase-independently inhibited by retinoic acid. To our knowledge, this is the first report that retinoic acid downregulates the tetranectin expression in human osteoblastic cells independent of the stage of cell differentiation, and is correlated with inhibition of mineralization.

Phase-independent Inhibition by Retinoic Acid of Mineralization Correlated with Loss of Tetranectin Expression in a Human Osteoblastic Cell Line.