Chondrogenic differentiation of bovine bone marrow mesenchymal stem cells in pellet cultural system

被引:165
作者
Bosnakovski, D [1 ]
Mizuno, M
Kim, G
Ishiguro, T
Okumura, M
Iwanaga, T
Kadosawa, T
Fujinaga, T
机构
[1] Hokkaido Univ, Grad Sch Vet Med, Dept Vet Clin Sci, Lab Vet Surg, Sapporo, Hokkaido 0600818, Japan
[2] Hokkaido Univ, Grad Sch Dent, Dept Oral Hlth Sci, Sapporo, Hokkaido 0600818, Japan
[3] Hokkaido Univ, Grad Sch Med, Dept Cytol & Histol, Sapporo, Hokkaido 0600818, Japan
关键词
D O I
10.1016/j.exphem.2004.02.009
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Objective. Pluripotent mesenchymal stem cells (MSC) have been isolated and well characterized from several tissue sources, including bone marrow stroma. MSC from different animals showed slight differences in morphology and in the potential to differentiate. In the present study, we isolated MSC from bovine bone marrow and induced chondrogenesis in order to establish a new experimental model of stem cell research. Methods. Bone marrow was harvested from 8 calves. For inducing chondrogenesis, MSC were cultured in pellet culture system in a chemically defined medium supplemented with 0 and 10 ng/mL of transforming growth factor beta1 (betaGF-beta1). Chondrogenic differentiation was evaluated by histological, immunohistochemical, and in situ hybridization techniques. The degrees of genes expression were measured by quantitative RT-PCR. Results. Metachromatic alcian blue staining and immunoreactivity for type II collagen were detected in both pellet groups (0 and 10 ng/mL TGF-beta1) after 7 days of culturing. In situ hybridization demonstrated strong expression of type II collagen and aggrecan mRNAs in the round cells located at the center region of pellets and at densely organized areas. On the other hand, type I collagen mRNA was strongly expressed in the superficial layer of the pellets. After 20 days of pellet culture, expression of type II collagen mRNA in the cells which were not treated by TGF-beta1 was 1.7-fold higher compared with that treated by TGF-beta1. Conclusion. Independent, spontaneous chondrogenesis of bovine MSC in pellet culture occurred without addition of any external bioactive stimulators, namely factors from TGFP family, which were previously considered necessary. (C) 2004 International Society for Experimental Hematology. Published by Elsevier Inc.
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页码:502 / 509
页数:8
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