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4 protocols using recombinant tgf β rtgf β

1

In Vitro Generation of Th17 Cells

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For Th17 cell generation, cells were stimulated by plate–bound anti-CD3 (2C11, 5 μg/ml; eBioscience) plus CD28 (37.51, 1 μg/ml; eBioscience), recombinant murine IL6 (rIL6, 20 ng/ml; Peprotech, Rocky Hill, NJ) and recombinant TGF-β (rTGF-β, 0.5 ng/ml; Peprotech) in the presence or absence of vitamin C (10 μg/ml, Sigma-Aldrich, St. Louis, MO) for 3 d. To prevent the Foxp3 expression, 10 μg/ml of anti-IL2 blocking mAb (clone: S4B6) was always added except some samples in supplementary Fig. 1.
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2

Chondrocyte Extracellular Matrix Analysis

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All reagents were from Sigma‐Aldrich (Munich, Germany), unless otherwise identified. Recombinant TGF‐β (rTGF‐β) was purchased at Peprotech (Hamburg, Germany) and the dimethylmethylene blue dye at Serva (Heidelberg, Germany). The anti‐TGF‐β (V) and anti‐SOX9 (C‐20) antibodies were from Santa Cruz Biotechnology (Heidelberg, Germany), the anti‐type‐II collagen (II‐II6B3) antibody from the NIH Hybridoma Bank (University of Iowa, Ames, USA), the anti‐type‐I collagen (AF‐5610) antibody from Acris (Hiddenhausen, Germany) and the anti‐type‐X collagen (COL‐10) from Sigma‐Aldrich. Biotinylated secondary antibodies and the ABC reagent were obtained from Vector Laboratories (Alexis Deutschland GmbH, Grünberg, Germany). The hTGF‐β Quantikine ELISA was from R&D Systems (Wiesbaden, Germany) and the type‐II, ‐I and ‐X collagen ELISAs from from Antibodies‐Online (Aachen, Germany).
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Chondrogenic Differentiation Assay

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All reagents were from Sigma (Munich, Germany), unless otherwise identified. Recombinant TGF-β (rTGF-β) was purchased at Peprotech (Hamburg, Germany) and the dimethylmethylene blue dye at Serva (Heidelberg, Germany). The anti-FGF-2 (C-18) and anti-SOX9 (C-20) antibodies were from Santa Cruz Biotechnology (Heidelberg, Germany), the anti-type-II collagen (II-II6B3) antibody from the NIH Hybridoma Bank (University of Iowa, Ames, USA), the anti-type-I collagen (AF-5610) antibody from Acris (Hiddenhausen, Germany), and the anti-type-X collagen (COL-10) antibody from Sigma. Biotinylated secondary antibodies and the ABC reagent were obtained from Vector Laboratories (Alexis Deutschland GmbH, Grünberg, Germany). The FGF-2 Quantikine ELISA (DFB50) was from R&D Systems (Wiesbaden, Germany) and the type-II, −I, and -X collagen ELISAs from Antibodies-Online (Aachen, Germany).
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4

Extracellular Matrix Characterization Protocol

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Recombinant TGF‐β (rTGF‐β) was purchased at Peprotech (Hamburg, Germany), dimethylmethyleneblue (DMMB) at Serva (Heidelberg, Germany) and diaminobenzidine (DAB) at Sigma‐Aldrich (Munich, Germany). The anti‐IGF‐I (AF‐291‐NA) antibody was from R&D Systems (Wiesbaden, Germany), the anti‐type‐II collagen (II‐II6B3) antibody from NIH Hybridoma Bank (University of Iowa, Ames, USA), the anti‐SOX9 (C‐20) antibody from Santa Cruz Biotechnology (Heidelberg, Germany), the anti‐type‐I collagen (AF‐5610) antibody from Acris (Hiddenhausen, Germany) and the anti‐type‐X collagen (COL‐10) antibody from Sigma‐Aldrich. Secondary biotinylated antibodies and the ABC kit were from Vector Laboratories (Alexis Deutschland GmbH, Grünberg, Germany). The hIGF‐I Quantikine ELISA was purchased at R&D Systems and the type‐II, ‐I and ‐X collagen ELISAs at Antibodies‐Online (Aachen, Germany).
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