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. 2007 May 1;9(4):929–939. doi: 10.1111/j.1582-4934.2005.tb00389.x

Molecular and cellular characterization during chondrogenic differentiation of adipose tissue‐derived stromal cells in vitro and cartilage formation in vivo

Yunfeng Lin 1, En Luo 1, Xizhe Chen 1, Lei Liu 1, Ju Qiao 2, Zhengbin Yan 1, Zhiyong Li 1, Wei Tang 1, Xiaohui Zheng 1, Weidong Tian 1,✉
PMCID: PMC6740126  PMID: 16364200

Abstract

Human adipose tissue is a viable source of mesenchymal stem cells (MSCs) with wide differentiation potential for musculoskeletal tissue engineering research. The stem cell population, termed processed lipoaspirate (PLA) cells, can be isolated from human lipoaspirates and expanded in vitro easily. This study was to determine molecular and cellular characterization of PLA cells during chondrogenic differentiation in vitro and cartilage formation in vivo. When cultured in vitro with chondrogenic medium as monolayers in high density, they could be induced toward the chondrogenic lineages. To determine their ability of cartilage formation in vivo, the induced cells in alginate gel were implanted in nude mice subcutaneously for up to 20 weeks. Histological and immunohistochemical analysis of the induced cells and retrieved specimens from nude mice at various intervals showed obviously cartilaginous phenotype with positive staining of specific extracellular matrix (ECM). Correlatively, results of RT‐PCR and Western Blot confirmed the expression of characteristic molecules during chondrogenic differentiation namely collagen type II, SOX9, cartilage oligomeric protein (COMP) and the cartilage‐specific proteoglycan aggrecan. Meanwhile, there was low level synthesis of collagen type X and decreasing production of collagen type I during induction in vitro and formation of cartilaginous tissue in vivo. These cells induced to form engineered cartilage can maintain the stable phenotype and indicate no sign of hypertrophy in 20 weeks in vivo, however, when they cultured as monolayers, they showed prehypertrophic alteration in late stage about 10 weeks after induction. Therefore, it is suggested that human adipose tissue may represent a novel plentiful source of multipotential stem cells capable of undergoing chondrogenesis and forming engineered cartilage.

Keywords: chondrogenic differentiation, lipoaspirate cells, collagen, cartilage oligomeric protein

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