Abstract
In order to direct embryonic stem (ES) cells to differentiate into chondrocytes, a chondrogenic environment provided by mature chondrocytes was investigated. Flk-1 positive cells sorted from pre-differentiated mouse ES cells were mixed with adult porcine articular chondrocytes, seeded on biodegradable scaffolds, and then implanted subcutaneously into nude mice. The cell-scaffold complexes formed cartilage tissues after 4 weeks, which was demonstrated by histology and anti-type II collagen antibody staining. Positive staining of mouse Major Histocompatibility Complex class I molecules confirmed that part of the chondrocytes were derived from mouse ES cells. The current study established a new approach for directing ES cell differentiation.
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