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Laboratorio di Differenziamento Cellulare (I.M., A.M., G.C., R.C., R.Q.), Istituto Nazionale per la Ricerca sul Cancro/Centro di Biotecnologie Avanzate, 16132 Genova, Italy; Dipartimento di Informatica (I.M.), Sistemistica e Telematica (DIST), Università di Genova, 16145 Genova, Italy; and Dipartimento di Oncologia Clinica e Sperimentale (R.C.), Università di Genova, 16132 Genova, Italy
Address all correspondence and requests for reprints to: Rodolfo Quarto M.D., Laboratorio di Differenziamento Cellulare, Istituto Nazionale per la Ricerca sul Cancro/Centro di Biotecnologie Avanzate, Largo Rosanna Benzi no. 10, 16132 Genova, Italy.
We have investigated the effects of different growth factors on the proliferation and osteogenic potential of primary cultures of human bone marrow stromal cells (BMSC). Fibroblast growth factor (FGF)-2 was the most effective in promoting growth of these cells in vitro. The size of colonies formed in clonal conditions was approximately 2.5 times larger in presence of FGF-2. Also the morphology of BMSC was affected: cells cultured in 10% FCS alone became flattened, whereas FGF-2 expanded cells maintained a fibroblast-like elongated phenotype. Levels of alkaline phosphatase activity in BMSC expanded with FGF-2 were significantly lower (56%) than control and, after stimulation with ascorbic acid, ßGlycerophosphate and dexamethasone, FGF-2 expanded BMSC deposited approximately 3-fold more mineralized matrix than control cells. We have assessed osteogenicity of BMSC on hydroxyapatite porous scaffolds (bioceramics) by an ectopic bone formation assay. FGF-2 expanded BMSC yielded a higher bone formation (>20-fold) than control cells. We conclude that FGF-2, promoting BMSC proliferation, maintains cells in a more immature state allowing in vitro expansion of human osteo-progenitors which, associated with bioceramics, can differentiate in vivo and form bone tissue.
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