Carboxyl-terminal parathyroid hormone peptide (53-84) elevates alkaline phosphatase and osteocalcin mRNA levels in SaOS-2 cells.

Abstract

Previous findings in our laboratory have shown that hPTH-(53-84) stimulates alkaline phosphatase activity in dexamethasone-treated ROS 17/2.8 cells. In the present study, we examined the effects of hPTH-(53-84) and hPTH-(1-34) on the expressions of alkaline phosphatase, osteocalcin, and collagen type I mRNA levels in the human osteosarcoma cell line SaOS-2. The effect of hPTH-(53-84) on alkaline phosphatase and osteocalcin message levels was dose dependent (ANOVA, p < 0.005 and p < 0.001, respectively), with significant stimulation observed at 10 nM. Treatment with 10 nM hPTH-(53-84) for 24 h resulted in significant 2- and 1.4-fold increases in mRNA levels for alkaline phosphatase and osteocalcin, respectively (p < 0.05), but had no effect on collagen type I expression. The increased alkaline phosphatase mRNA levels was associated with a 1.5-fold increase in enzyme activity (p < 0.05). In contrast, under similar incubation conditions, hPTH-(1-34) had no significant effects on alkaline phosphatase or osteocalcin mRNA levels. On the other hand, hPTH-(1-34) had dose-dependent stimulatory effects on collagen type I mRNA levels (ANOVA, p < 0.001), 10 nM hPTH-(1-34) stimulating collagen type I expression 1.6-fold (p < 0.05). The results indicate that carboxyl-terminal hPTH-(53-84) has direct and unique biologic effects in human osteoblast-like cells in culture.

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@article{Sutherland1994CarboxylterminalPH, title={Carboxyl-terminal parathyroid hormone peptide (53-84) elevates alkaline phosphatase and osteocalcin mRNA levels in SaOS-2 cells.}, author={Megan K. Sutherland and Leticia Gomez Rao and John N . Wylie and A. Gupta and Hao Ly and Jaro Sodek and Timothy McCleod Murray}, journal={Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research}, year={1994}, volume={9 4}, pages={453-8} }