Analysis was performed using SigmaPlot 11.0 (Systat Software, Inc.). Experiments involving several genotypes (or combinations of genotypes in co-cultures) and treatments were examined by two-way ANOVA, followed by post hoc Bonferroni pairwise multiple comparison. If data were not normally distributed, they were transformed (log 10) before ANOVA. Comparison of multiple treatments to a single control was examined by one-way ANOVA, followed by Bonferroni pairwise multiple comparison. If these data were not
normally distributed, find more they were examined by one-way ANOVA on ranks, followed by Dunn’s Test for all pairwise multiple comparisons. To study effects of endogenous PGs on PTH-stimulated OB differentiation, we used BMSCs from WT and Cox-2 KO mice. Despite the constitutive
expression of Cox-1, very little PGE2 is measurable in the media of Cox-2 KO BMSC cultures [14] and [33]. It is expected that there will be “basal” production of PGE2 in WT BMSC cultures because fresh serum stimulates Cox-2 expression [34]. Because PGE2 can stimulate OB differentiation, this basal production often leads to increased OB differentiation in vehicle-treated WT compared to KO or NSAID-treated WT cultures, as seen here (e.g., Figs. 1A–E). PTH is expected to further induce PFT�� nmr Cox-2 expression and PGE2 production in these cultures [12] and [13]. BMSCs were cultured with PTH (10 nM) added at plating of cells and with each media change. This protocol should provide continuous exposure to PTH because PTH has been shown to be stable in culture up to 72 h between medium changes [35]. As we showed previously
[26], PTH stimulated OB differentiation in Cox-2 KO, but not WT, BMSC cultures. PTH stimulated marked increases in Alp and Osteocalcin mRNA ( Figs. 1A,B) and alizarin red staining (data not shown) in KO cultures, but not in WT cultures. In WT cultures, PTH decreased, or tended to decrease, markers of OB differentiation relative to vehicle treatment. The stimulatory effect of PTH in Cox-2 KO cultures was seen by day 7 of culture and was maintained throughout 3 weeks of culture ( Fig. 1A). To determine if the inhibitory effect of PLEKHM2 COX-2 was due to COX-2 activity, we examined treatment with a selective inhibitor of COX-2 activity, NS398. NS398 restored the ability of PTH to stimulate Alp and Osteocalcin mRNA expression and alizarin red staining in WT cultures, confirming that the inhibitory effects were due to PG production ( Figs. 1C–E). Because there may be reciprocal effects between OB and adipocyte differentiation [36] and [37] and because PTH can regulate adipocyte differentiation [35], we examined expression of Adiponectin, a marker of adipocytes, and Pparγ, a transcription factor that may be important not only for stimulating adipogenesis but also for suppressing osteogenesis [38]. PTH inhibited both Adiponectin and Pparγ expression on day 14 of culture in WT, but not Cox-2 KO, cultures ( Figs. 2A,B). Similar patterns were seen on day 21 (data not shown).
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