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Parathyroid hormone: a double-edged sword for bone metabolism
Ling Qin1, Liza J Raggatt, Nicola C Partridge
1Department of Physiology and Biophysics, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ 08854, USA.
Trends in Endocrinology and Metabolism: TEM
|March 24, 2004
Summary
Parathyroid hormone (PTH) has dual effects on bone. Daily injections stimulate bone formation for osteoporosis, but continuous infusion causes bone loss, likely due to administration timing and signaling.
Area of Science:
- Endocrinology
- Bone Biology
- Pharmacology
Background:
- Parathyroid hormone (PTH) is crucial for calcium metabolism.
- PTH is the sole FDA-approved drug stimulating bone formation for osteoporosis treatment via daily injection.
- Continuous PTH infusion, however, leads to bone loss, indicating complex, dual actions.
Purpose of the Study:
- To review current knowledge on the dual effects of parathyroid hormone (PTH).
- To explore the molecular and cellular mechanisms behind PTH's divergent actions on bone.
- To elucidate the role of administration kinetics in PTH's anabolic and catabolic effects.
Main Methods:
- Literature review of studies on parathyroid hormone (PTH) effects.
- Analysis of molecular and cellular mechanisms involved in PTH signaling.
- Synthesis of existing data to explain PTH's dual actions.
Main Results:
- Parathyroid hormone (PTH) exhibits both bone-building (anabolic) and bone-destroying (catabolic) properties.
- The method of PTH administration significantly influences its effect on bone.
- Emerging evidence points to specific signaling pathways mediating these divergent effects.
Conclusions:
- The administration kinetics of parathyroid hormone (PTH) are critical in determining its therapeutic outcome.
- Understanding PTH signaling pathways is key to harnessing its anabolic potential while mitigating catabolic risks.
- Future therapeutic strategies may involve optimizing PTH delivery for enhanced osteoporosis treatment.