Consequences of chondrocyte hypertrophy on osteoarthritic cartilage: potential effect on angiogenesis  L. Pesesse, C. Sanchez, J.-P. Delcour, A. Bellahcène,

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Consequences of chondrocyte hypertrophy on osteoarthritic cartilage: potential effect on angiogenesis  L. Pesesse, C. Sanchez, J.-P. Delcour, A. Bellahcène, C. Baudouin, P. Msika, Y. Henrotin  Osteoarthritis and Cartilage  Volume 21, Issue 12, Pages 1913-1923 (December 2013) DOI: 10.1016/j.joca.2013.08.018 Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Evolution of the expression of hypertrophy markers (A) col10a1 (ANOVA: P < 0.0001), (B) runx2 (ANOVA: P = 0.0002), (C) MMP13 (ANOVA: P < 0.0001), and the activity of mineralization enzymes (D) AP (ANOVA: P < 0.0001) and (E) NTPPPH (ANOVA: P = 0.0003) in OA chondrocytes cultivated in alginate beads for 28 days in medium supplemented with either 2% ULTROSER G or 10% FBS. The increase of expression/activity of hypertrophy markers was significant after 21 days (col10a1: P = 0.0363; runx2: P = 0.0379; MMP13: P = 0.0152; AP: P = 0.0047; NTPPPH: P = 0.0158), 24 days (col10a1: P = 0.0012; runx2: P = 0.0007; MMP13: P < 0.0001; AP: P = 0.0126; NTPPPH: P = 0.0103) and 28 days (col10a1: P = 0.0002; runx2: P = 0.0208; MMP13: P < 0.0001; AP: P = 0.0008; NTPPPH: P = 0.0054) when compared with expression/activity after 3 days of culture. Comparison of hypertrophy markers expression/activity by chondrocytes cultivated in FBS-enriched medium with the corresponding day of culture in 2% UG-supplemented medium revealed a significant increase after 21 days (runx2: P = 0.0473; MMP13: P = 0,0062; AP: P = 0.0052; NTPPPH: P = 0.0232) 24 days (col10a1: P = 0.0031; runx2: P = 0.0011; MMP13: P < 0.0001; AP: P = 0.0152; NTPPPH: P = 0.0320) and 28 days of culture (col10a1: P = 0.0015; runx2: P = 0.0237; MMP13: P < 0.0001; AP: P = 0.0011; NTPPPH: P = 0.0183). Data from three different chondrocytes cultures were collected every 3–4 days, normalized to the house-keeping gene HPRT or to the DNA content and presented in percentage of their respective control. Data were analyzed by Dunnett's test after one-way ANOVA and are presented with the mean ± 95% confidence interval. Osteoarthritis and Cartilage 2013 21, 1913-1923DOI: (10.1016/j.joca.2013.08.018) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Representative pictures of hematoxylin-eosin stained wax-embedded sections of OA chondrocytes cultivated in alginate beads during 3 days (A and B) or 21 days (C and D) in medium supplemented with either 2% UG (A and C) or 10% FBS (B and D) (magnification 20×). Osteoarthritis and Cartilage 2013 21, 1913-1923DOI: (10.1016/j.joca.2013.08.018) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Effect of non-hypertrophic (NH) and hypertrophic (H) OA chondrocyte conditioned media on wound healing by endothelial cells (HUVECS) (A and B), HUVECS real-time migration (C), real-time invasion (D) and adhesion (E). (A) Representative pictures (magnification 10×) of the wound healing experiment showing the gap in HUVECs at the beginning of the experiment (h0) and after 24 h of incubation (h24); (B) Wound healing (ANOVA: P = 0.0005) was quantified using image J SoftWare (www.rsbweb.nih.gov/ij/) and data are presented in percentage of non-hypertrophic chondrocyte conditioned media at h0. Hypertrophic chondrocyte conditioned medium significantly increased wound healing by endothelial cells at h24 compared to h0 (P = 0.0008) and compared to the effect of non-hypertrophic chondrocyte conditioned medium at h24 (P = 0.0250). (C and D) Real-time HUVECS migration (ANOVA: P < 0.0001) and invasion (ANOVA: P < 0.0001) were analyzed every 5 h on a period of 25 h. Hypertrophic chondrocyte conditioned medium significantly stimulated HUVECS migration after 25 h (P < 0.0001) and invasion was increased after 5 h (P = 0.0087), 10 h (P < 0.0001) and 15 h (P < 0.0001) compared to control condition and after 10 h (P < 0.0001) compared to non-hypertrophic chondrocyte conditioned medium (###). Non-hypertrophic chondrocyte conditioned medium stimulated HUVECS invasion after 15 h (P = 0.0041). In wound healing and real-time assays, control condition is a non-conditioned culture medium containing 10% FBS. (E) HUVECS adhesion was analyzed after 2 h incubation of HUVECS on different coating conditions (ANOVA: P = 0.0003). Hypertrophic chondrocyte conditioned medium significantly increased HUVECS adhesion (P = 0.0463) compared to non-hypertrophic chondrocyte conditioned medium. Positive and negative controls are respectively coatings of 10 μg/ml recombinant BSP or BSA. Data were analyzed by Tukey's test after one-way ANOVA and are presented with mean ± 95% confidence interval. Each data point is the mean of at least three measures and each experiment was performed on three different chondrocytes cultures. Osteoarthritis and Cartilage 2013 21, 1913-1923DOI: (10.1016/j.joca.2013.08.018) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 BSP detection in OA chondrocytes cultures by RT-PCR (A), western blot on cellular protein extracts (B) and western blot on chondrocytes conditioned media (C). (A) BSP gene expression by non-hypertrophic (NH) and hypertrophic (H) chondrocytes. Data from three different chondrocytes cultures were analyzed by F test to compare variances and are presented in percentage of control with the mean ± 95% confidence interval. The expression of BSP gene was significantly higher in hypertrophic than in non-hypertrophic chondrocytes (P = 0.0001). (B) BSP production in cellular extracts from NH and H chondrocytes. Equal protein loading was assessed by anti-tubulin-α immunoblotting. (C) BSP secretion in conditioned chondrocyte media from NH and H chondrocytes. Equal protein loading was assessed by Ponceau red staining. Molecular weight difference in control and chondrocytes conditioned medium is discussed in the discussion section. Western blot experiments were performed at least on three different cultures and representative data from one experiment are shown. Control (CTL) is constituted of Saos2 cellular protein extracts or conditioned medium. Osteoarthritis and Cartilage 2013 21, 1913-1923DOI: (10.1016/j.joca.2013.08.018) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 Spearman's correlation and corresponding P-value were calculated to assess the association between BSP expression and specific markers of chondrocyte hypertrophy (A) collagen type X expression (P < 0.0001), (B) runx2 expression (P < 0.0001), (C) MMP13 expression (P = 0.0031), (D) AP activity (P = 0.007), (E) NTPPPH activity (P < 0.0001). Data were collected from non-hypertrophic and hypertrophic OA chondrocytes (n = 28). Osteoarthritis and Cartilage 2013 21, 1913-1923DOI: (10.1016/j.joca.2013.08.018) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 6 Adhesion assay performed with a pre-incubation of HUVECS with the GRGDS peptide at 50nmoles/l (ANOVA: P = 0.0033). Blocking of HUVECS αvβ3 integrin receptors with the GRGDS reduced adhesion of HUVECs on hypertrophic chondrocyte conditioned media coating (H + GRGDS) with a significant decrease of 52% in HUVECs adhesion (P = 0.0039). The GRGDS pre-treatment had no effect on non-hypertrophic chondrocyte conditioned media coating (NH + GRGDS). Data from three different chondrocyte cultures were analyzed by Tukey's test after one-way ANOVA. Each experimental condition was performed in sextuple. Osteoarthritis and Cartilage 2013 21, 1913-1923DOI: (10.1016/j.joca.2013.08.018) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions