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Quantitative Study of Tissue-Engineered Cartilage With Human Bone Marrow Mesenchymal Stem Cells
Yonggang Pang, MD;
Pengcheng Cui, MD;
Wenxian Chen, MD;
Pengfei Gao, MD;
Huizhong Zhang, MD
Arch Facial Plast Surg. 2005;7:7-11.
Objectives To assess the possibility of cartilage tissue engineering using human mesenchymal stem cells (hMSCs) and to investigate the quantitative relationship between hMSCs and engineered cartilage.
Design Human mesenchymal stem cells were cultured, cryopreserved, and expanded in vitro. Surface antigens were detected by flow cytometry. In vitro chondrogenesis of hMSCs and cryopreserved hMSCs was performed. The chondrogenesis-induced hMSCs were seeded onto polyglycolic acid scaffolds, cultured in vitro for 3 weeks in chondrogenic medium, and then implanted into nude mice. The implants were harvested after 10 weeks and examined with histologic and immunochemical staining.
Results The construction of cartilages was identified grossly and histologically: 1.9 to 2.5 x 107 nucleated cells were obtained from 1 mL of bone marrow, and about 1 to 2 x 106 hMSCs were obtained from the primary culture. The number of hMSCs tripled at every passage and reached 1.4 to 2.8 x 1012 at passage 15. The purity of hMSCs was 95% and 98% at the primary and the fourth passages, respectively. Twenty-one days was the optimal (induction rate, 95%) induction time, with no apparent differences in induction rates among different passages. Based on our findings, hMSCs from 0.07 to 0.14 mL of bone marrow, expanded during 4 passages and induced for 21 days, would be sufficient to engineer 1 cm2 of cartilage, 3-mm thick.
Conclusion Quantitative standards of hMSCs as seed cells for cartilage tissue engineering were established and may have value for later clinical work.
Author Affiliations: Department of Otorhinolaryngology (Drs Pang, Cui, Chen, and Gao) and Central Laboratory (Dr Zhang), TangDu Hospital, The Fourth Military Medical University, Xi’an, People’s Republic of China.
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