FGF-2 potently induces both proliferation and DSP expression in collagen type I gel cultures of adult incisor immature pulp cells.
We investigated the effects of both cytokines and extracellular matrices on the proliferation and differentiation of immature adult rat incisor dental pulp cells. These immature cells, which have a high-proliferative potency in vitro and do not express mRNAs for dentin non-collagenous proteins such as dentin sialoprotein (DSP), bone sialoprotein (BSP), and osteocalcin, exist in the root regions of adult rat incisors. Fibroblast growth factor-2 (FGF-2) stimulated the proliferation of these immature cells and the subsequent production of mineralized calcium was induced by beta-glycerophosphate treatment. Additionally, FGF-2 dramatically induced the expression of DSP and BSP mRNAs, but only in collagen type I gel cultures, whereas neither plate-coated collagen type I nor fibronectin, laminin or collagen type IV cultures could produce this effect and generate sufficient physiological levels of these transcripts. Although bone morphogenetic protein-4 could not induce the proliferation of immature dental pulp cells nor upregulate DSP mRNA expression, it had a synergistic effect upon DSP transcript levels in conjunction with FGF-2. These results suggest that both the presence of FGF-2 and the three-dimensional formation of immature dental pulp cells in collagen type I gel cultures are essential for both DSP expression and odontoblast differentiation. These observations provide valuable information concerning the study of the commitment and differentiation of odontoblast lineages, and also provide a basis for the rational design of cytokine and extracellular matrix based compounds for regenerative therapies in new dental treatments.
Nakao
Kazuhisa
K
Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510, Japan.
Itoh
Makoto
M
Tomita
Yusuke
Y
Tomooka
Yasuhiro
Y
Tsuji
Takashi
T
D000818:Animals; D018929:Cell Culture Techniques / Q000379:methods*; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D024042:Collagen Type I / Q000378:metabolism*; D016207:Cytokines / Q000494:pharmacology; D003782:Dental Pulp / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D016326:Extracellular Matrix Proteins / Q000378:metabolism*; D005260:Female; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology*; D005782:Gels / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D007180:Incisor / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D058574:Integrin-Binding Sialoprotein; D010750:Phosphoproteins; D011498:Protein Precursors / Q000096:biosynthesis*; D051381:Rats; D017208:Rats, Wistar; D012795:Sialoglycoproteins / Q000096:biosynthesis; D014018:Tissue Distribution; D023822:Tissue Engineering / Q000379:methods; D000099311:Dentin Sialophosphoprotein
D024042:Collagen Type I; D016207:Cytokines; D016326:Extracellular Matrix Proteins; D016222:Fibroblast Growth Factor 2; D005782:Gels; D058574:Integrin-Binding Sialoprotein; D010750:Phosphoproteins; D011498:Protein Precursors; D012795:Sialoglycoproteins; D000099311:Dentin Sialophosphoprotein; C546873:Ibsp protein, rat