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Low-dose parathyroid hormone and estrogen reverse alkaline phosphatase activity suppressed by dexamethasone in mouse

Mei-Fway Iu1, Hiroshi Kaji, Junko Naito

  • 1Division of Endocrinology/Metabolism, Neurology and Hematology/Oncology, Department of Clinical Molecular Medicine, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan.

Journal of Bone and Mineral Metabolism
|November 2, 2005
PubMed

Insights

Glucocorticoid (GC)-induced osteoporosis (GIO) is a concern in patients with excessive GC use. This study found that low-dose parathyroid hormone (PTH) and estrogen can reverse GC-inhibited bone formation in mouse cells.

Area of Science:

  • Bone Biology
  • Endocrinology
  • Pharmacology

Background:

  • Glucocorticoid (GC)-induced osteoporosis (GIO) is a common side effect of GC therapy.
  • The precise mechanisms by which GCs inhibit bone formation remain incompletely understood.
  • Parathyroid hormone (PTH) and estrogen are potential therapeutic agents for GIO.

Purpose of the Study:

  • To investigate the effects of PTH and estrogen on dexamethasone (Dex)-induced inhibition of osteoblastic cell activity.
  • To explore the role of these hormones in mitigating GC-impaired bone formation.

Main Methods:

  • Utilized the mouse osteoblastic cell line MC3T3-E1.
  • Assessed cell proliferation and alkaline phosphatase (ALP) activity.
  • Examined the effects of varying doses of PTH, 17-beta-estradiol (17beta-E2), ICI 182780, and anti-IGF-I antibody.

Main Results:

  • Low-dose PTH (10(-11) M) and 17beta-E2 significantly attenuated Dex-inhibited ALP activity.
  • ICI 182780 blocked the protective effect of 17beta-E2, and anti-IGF-I antibody neutralized 17beta-E2's effect on ALP activity.
  • Low-dose PTH, but not 17beta-E2, inhibited Dex-induced suppression of [3H]thymidine incorporation.

Conclusions:

  • Low-dose PTH and estrogen demonstrate a capacity to reverse dexamethasone-induced inhibition of alkaline phosphatase activity in osteoblastic cells.
  • These findings suggest potential therapeutic avenues for managing GIO by targeting specific hormonal pathways.

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