S100A1 and S100B mediate the suppression of terminal differentiation of chondrocytes by the SOX trio. S100A1 and S100B mediate the suppression of terminal.

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Supplemental figure 1 ab CtrlPi * %Cells with GFP-LC3 puncta  -actin LC3I LC3II Ctrl Pi (3 mM) CtrlPi * LC3-II protein.
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S100A1 and S100B mediate the suppression of terminal differentiation of chondrocytes by the SOX trio. S100A1 and S100B mediate the suppression of terminal differentiation of chondrocytes by the SOX trio. (A) Messenger RNA levels of the terminal differentiation markers COL10 and RUNX2, ALP staining and activity, and Alizarin red staining in stable lines of ATDC5 cells with retroviral transfection of GFP, S100A1, S100B or a combination of both, and in non‐transfected parental cells (–) after culture for 3 weeks with ITS (insulin, transferrin and sodium selenite) and 2 days with inorganic phosphate. (B) Analysis of the above markers in stable lines of ATDC5 cells retrovirally transfected with siRNA of GFP, S100A1, S100B or a combination of both, and in non‐transfected parental cells (–) under the culture conditions given above. (C) COL10 mRNA level and S100A1 and S100B protein levels are shown as western blots in ATDC5 cells with adenoviral transfection of GFP, SOX9, the SOX trio or S100A1+S100B, and in non‐transfected parental cells (–) after 10 days of a pellet culture. (D) Identical analysis in ATDC5 cells co‐transfected with GFP or the SOX trio, and siRNA of GFP or S100A1+S100B, compared with those in non‐transfected parental cells (–) after 10 days of a pellet culture. The graphs are expressed as means (bars)±s.d.s (error bars) for 3 wells/group. ALP, alkaline phosphatase; COL10, type X collagen; GFP, green fluorescent protein; PCNA, proliferating cell nuclear antigen; RUNX2, runt‐related transcription factor 2; siRNA, small interfering RNA; SOX, sex‐determining region Y‐type high mobility group box. Taku Saito et al. EMBO Rep. 2007;8:504-509 © as stated in the article, figure or figure legend