Figure 5. Extracellular HSP70 enhances BMP-induced condensation formation, ALP activity and mineralization in CVC.
CVC were treated with BMP-4 (50 ng/ml) or BMP-2 (300 ng/ml), HSP70 (50 ng/ml) and conditioned medium from BAEC transfected with the N-FLAG-MGP (approximately 50 ng/ml) construct or empty vector as indicated for 2 or 8 days. After 2 days, formation of condensations was examined (A), and ALP activity was determined (B, D). After 8 days, accumulation of calcium was determined (C, E).
Asterisks indicate statistically significant differences compared to control (empty plasmid). *, p<0.05; **, p < 0.01; ***, p < 0.001; Tukey’s test.