Comparative study of chondrogenesis of human adipose-derived mesenchymal stem cells when cultured in collagen-containing media under in vitro conditions

In terms of method of production, collagen carriers are subdivided into materials obtained on the basis of extracellular matrix (ECM) components, particularly collagen-containing hydrogels and decellularized tissue.

Objective: to compare in vitro the ability of biopolymer microheterogeneous collagen-containing hydrogel (BMCH) and tissue-specific matrix from decellularized porcine articular cartilage (DPAC) to support adhesion, proliferation and chondrogenic differentiation of human adipose-derived mesenchymal stem cells (hAMSCs).

Materials and methods. For cartilage decellularization, we carried out treatment with surfactants (sodium dodecyl sulfate, Triton X-100) followed by exposure in DNAase. The metabolic activity of hAMSCs was assessed by PrestoBlue™ (Invitrogen, USA) staining. The morphological study of cell-engineered constructs (CECs) formed by culturing hAMSCs in the presence of matrices was performed using histological staining and scanning electron microscopy (SEM) with lanthanide contrasting.

Results. The number of cells on the surface of both BMCH and DPAC increased within 14 days. Mitochondrial activity of the cells was 1.7, 1.7, and 1.3 times higher on days 3, 10, and 14 when cultured on DPAC compared to BMCH, respectively. On day 14 of cultivation in the chondrogenic culture medium, hAMSCs formed cell layers on the DPAC surface and on the BMCH surface. Cytoplasm of the cells included numerous granules, which, when stained, resembled the matrix itself. On the DPAC matrix surface, cells were more evenly distributed, whereas in the case of BMCH, cell adhesion and proliferation were observed only in certain areas. The ECM produced by the cells contained collagen and glycosaminoglycans (GAGs).

Conclusion. The ability of DPAC obtained according to the developed protocol to form CECs with hAMSCs with uniform distribution of cells and their production of specific collagen- and GAG-containing ECM suggests that DPAC is effective in regeneration of damaged cartilage. Chondrogenic differentiation of hAMSCs was observed both when cultured with BMCH and with DPAC. When creating a tissue equivalent of cartilage in vitro, the advantage of using tissue-specific matrix over BMCH should be considered.

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