Stimulation of extracellular signal-regulated kinases and proliferation in rat osteoblastic cells by parathyroid hormone is protein kinase C-dependent

被引:119
作者
Swarthout, JT
Doggett, TA
Lemker, JL
Partridge, NC
机构
[1] Univ Med & Dent New Jersey, Robert Wood Johnson Med Sch, Dept Physiol & Biophys, Piscataway, NJ 08854 USA
[2] St Louis Univ, Sch Med, Cell & Mol Biol Program, St Louis, MO 63104 USA
[3] St Louis Univ, Sch Med, Dept Pharmacol & Physiol Sci, St Louis, MO 63104 USA
[4] St Louis Univ, Sch Med, Dept Orthoped Surg, St Louis, MO 63104 USA
关键词
D O I
10.1074/jbc.M007400200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Parathyroid hormone (PTH) is known to have both catabolic and-anabolic effects on bone. The dual functionality of PTH may stem from its ability to activate two signal transduction mechanisms: adenylate cyclase and phospholipase C. Here, we demonstrate that continuous treatment of UMR 106-01 and primary osteoblasts with PTH peptides, which selectively activate protein kinase C, results in significant increases in DNA synthesis. Given that ERKs are involved in cellular proliferation, we examined the regulation of ERKs in UMR 106-01 and primary rat osteoblasts following PTH treatment. We demonstrate that treatment of osteoblastic cells with very low concentrations of PTH (10(-12) to 10(-11) at) is sufficient for, substantial increases in ERK activity. Treatment with PTH-(1-34) (10(-8) M), PTH-(1-31), or 8-bromo-cAMP failed to stimulate ERKs, whereas treatment;with phorbol 12-myristate 18-acetate, serum, or PTH peptides lacking the N-terminal amino acids stimulated activity. Furthermore, the activation of ERKs was prevented by pretreatment of osteoblastic cells with inhibitors of protein kinase C (GF 109203X) and MEK (PD 98059). Treatment of UMR cells with epidermal growth factor (EGF), but not PTH, promoted tyrosine phosphorylation of the EGF receptor. Transient transfection of UMR cells with p21(N17Ras) did not block activation of ERKs following treatment with low concentrations of PTH, Thus, activation of ERKs and proliferation by PTH is protein kinase C-dependent, but stimulation occurs :independently of the EGF receptor and Ras activation.
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页码:7586 / 7592
页数:7
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