The ability of mesenchymal stem cells (MSCs) to differentiate into cells expressing markers of retinal cells, to inhibit expression of genes for pro-inflammatory molecules, and to produce growth and differentiation factors. (A) MSCs were cultured for 7 d alone (-) or in the presence of retinal extract (E), in the presence of supernatant from activated T lymphocytes (S), or in the presence of E and S. The expression of genes for rhodopsin and S-antigen was determined by real-time PCR. The explants of the posterior segment of the eye were cultured for 48 h alone (-), with interleukin (IL)-17 and interferon (IFN)-γ (Cy), or were stimulated with cytokines in the presence of MSCs. The expression of genes for pro-inflammatory molecules IL-1β and inducible nitric oxide synthase was determined by PCR. Production of TGF-β and IGF-2 by MSCs. MSCs were cultured for 48 h unstimulated (-) or in the presence of IL-17 and IFN-γ (Cy). The expression of genes for TGF-β and IGF-2 was determined by real-time PCR. Each bar represents the mean (SD) from at least 3 independent determinations. Values with asterisk represent statistical significance (P < 0.05; A) gene expression, (B) inhibition of cytokine production, and (C) expression of genes for growth factors.