FGF-2 Increases Osteogenic and Chondrogenic Differentiation Potentials of Human Mesenchymal Stem Cells by Inactivation of TGF-beta Signaling

Overview

Journal Cytotechnology

Specialties Biotechnology
Genetics

Date 2008 Nov 13

PMID 19002835

Citations 45

Authors

Tomomi Ito

Rumi Sawada

Yoko Fujiwara

Toshie Tsuchiya

Affiliations

Soon will be listed here.

Abstract

Human mesenchymal stem cells (hMSCs) are able to self-replicate and differentiate into a variety of cell types including osteoblasts, chondrocytes, adipocytes, endothelial cells, and muscle cells. It was reported that fibroblast growth factor-2 (FGF-2) increased the growth rate and multidifferentiation potentials of hMSCs. In this study, we investigated the genes involved in the promotion of osteogenic and chondrogenic differentiation potentials of hMSCs in the presence of FGF-2. hMSCs were maintained in the medium with FGF-2. hMSCs were harvested for the study of osteogenic or chondrogenic differentiation potential after 15 days' culture. To investigate osteogenic differentiation, the protein levels of alkaline phosphatase (ALP) and the mRNA expression levels of osteocalcin were measured after the induction of osteogenic differentiation. Moreover, the investigation for chondrogenic differentiation was performed by measuring the mRNA expression levels of type II and type X collagens after the induction of chondrogenic differentiation. The expression levels of ALP, type II collagen, and type X collagen of hMSCs cultured with FGF-2 were significantly higher than control. These results suggested that FGF-2 increased osteogenic and chondrogenic differentiation potentials of hMSCs. Furthermore, microarray analysis was performed after 15 days' culture in the medium with FGF-2. We found that the overall insulin-like growth factor-I (IGF-I) and transforming growth factor-beta (TGF-beta) signaling pathways were inactivated by FGF-2. These results suggested that the inactivation of IGF-I and TGF-beta signaling promotes osteogenic and chondrogenic differentiation potential of hMSCs in the presence of FGF-2.

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