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In the present paper, the potential of canine articular cartilage-derived cells (cACCs) for chondrogenic differentiation was evaluated. The effectiveness of cACCs’ lineage commitment was analyzed after 14 days of culture in chondorgenic and non-chondrogenic conditions. Formation of proteoglycan-rich extracellular matrix was assessed using histochemical staining – Alcian Blue and Safranin-O, while elemental composition was determined by means of SEM-EDX. Additionally, ultrastructure of cACCs was evaluated using TEM. The expression of genes involved in chondrogenesis was monitored with quantitative Real Time PCR. Results obtained indicate that the potential of cACCs for cartilagous extracellular matrix formation may be maintained only in chondrogenic cultures. The formation of specific chondro-nodules was not observed in a non-chondrogenic culture environment. The analysis of cACCs’ ultrastructure, both in non-chondrogenic and chondrogenic cultures, revealed well-developed rough endoplasmatic reticulum and presence of mitochondria. The cACCs in chondrogenic medium shed an increased number of microvesicles. Furthermore, it was shown that the extracellular matrix of cACCs in chondrogenic cultures is rich in potassium and molybdenum. Additionally, it was determined that gene expression of collagen type II, aggrecan and SOX-9 was significantly increased during chondrogenic differentiation of cACCs. Results obtained indicate that the culture environment may significantly influence the cartilage phenotype of cACCs during long term culture.

Chondrogenic potential of canine articular cartilage derived cells (cACCs)