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Zinc supplementation inhibits the increase in osteoclastogenesis and decrease in osteoblastogenesis in
Natsumi Iitsuka1, Mamiko Hie, Ikuyo Tsukamoto
1Department of Food Science and Nutrition, Nara Women's University, Nara 630, Japan.
European Journal of Pharmacology
|June 6, 2013
Summary
Zinc supplementation in diabetic rats prevents bone loss by inhibiting osteoclast formation and promoting osteoblast activity. This study clarifies zinc
Area of Science:
- Bone Metabolism
- Endocrinology
- Nutritional Science
Background:
- Diabetes mellitus is associated with impaired bone metabolism and increased fracture risk.
- The role of zinc (Zn) in bone metabolism during diabetes requires in vivo clarification.
- Zinc is known to influence bone formation and resorption processes.
Purpose of the Study:
- To investigate the effects of zinc supplementation on bone metabolism in streptozotocine (STZ)-induced diabetic rats.
- To elucidate the impact of zinc on osteoclastogenesis and osteoblastogenesis in a diabetic model.
- To explore the molecular mechanisms underlying zinc's effects on bone cells in diabetes.
Main Methods:
- Streptozotocine (STZ)-induced diabetic rat model.
- Administration of zinc-supplemented water to diabetic rats.
- Assessment of bone metabolism markers, including enzyme activities, mRNA, and protein levels.
- Histological analysis of osteoclast and osteoblast populations.
- Analysis of key signaling pathways involved in bone remodeling (e.g., RANK, IGF-1).
Main Results:
- Zinc supplementation prevented diabetes-induced decreases in osteoblast markers (ALP, osteocalcin) and bone mineral content.
- Zinc inhibited diabetes-induced increases in osteoclast markers (TRAP, cathepsin K) and osteoclast number.
- Zinc modulated key signaling pathways, including inhibiting RANK expression and stimulating IGF-1/Akt/β-catenin signaling.
- Zinc supplementation normalized bone cell activity and numbers in diabetic rats.
Conclusions:
- Zinc supplementation effectively counteracts diabetes-induced bone loss in rats.
- Zinc protects bone by suppressing osteoclastogenesis and enhancing osteoblastogenesis.
- The beneficial effects of zinc involve the modulation of RANK and IGF-1 signaling pathways in diabetic bone metabolism.
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