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Immobilized TGF beta 1 and BMP2 are able to promote the differentiation of odontoblast-like cells in isolated mouse dental papillae cultured in vitro. These cells polarize and accumulate predentin-like matrix at their apical pole. Immobilized IGF1 mainly promoted polarization with disturbed matrix accumulation. In situ hybridization demonstrated that TGF beta 1 combined with heparin mirrored the physiological processes of odontoblast differentiation. Normal odontoblast and in vitro induced odontoblast-like cells expressed transcripts encoding for TGF beta 1 and 3, BMP2 and 4, bone sialoprotein and osteonectin whereas either ubiquitous expression or no expression could be detected for TGF beta 2, IGF1 or fibronectin mRNAs. Odontoblast-like cells obtained in the presence of IGF-1 combined with heparin did not express TGF beta 1 transcripts and expressed weakly TGF beta 3 transcripts. Our results suggest that in vivo an epithelial-derived member of the TGF beta family trapped by basement membrane-associated components interacts with competent preodontoblasts and promotes the polarization by triggering the transcription of growth factor gene(s) like TGF beta itself and/or selector gene(s) like msx2.

the international journal of developmental biology

Comparative analysis of TGF beta s, BMPs, IGF1, msxs, fibronectin, osteonectin and bone sialoprotein gene expression during normal and in vitro-induced odontoblast differentiation.