Moderate magnesium-restricted diet affects bone formation and bone resorption in rats
S I Katsumata1, H Matsuzaki, R Tsuboi
1Department of Nutritional Science, Faculty of Applied Bioscience, Tokyo University of Agriculture, Tokyo, Japan.
Magnesium Research
|July 19, 2006
Summary
Moderate magnesium restriction in rats decreased bone formation and increased bone resorption. These effects on bone metabolism were linked to reduced insulin-like growth factor-1 (IGF-1) and increased soluble receptor activator of nuclear factor-kappaB ligand (sRANKL) levels.
Area of Science:
- Bone Biology
- Nutritional Science
- Endocrinology
Background:
- Magnesium (Mg) is essential for bone health.
- The impact of moderate Mg restriction on bone turnover markers is not fully understood.
Purpose of the Study:
- To investigate the effects of moderate magnesium restriction on bone formation and resorption in a rat model.
- To explore the potential roles of insulin-like growth factor-1 (IGF-1) and soluble receptor activator of nuclear factor-kappaB ligand (sRANKL) in mediating these effects.
Main Methods:
- Weanling Wistar rats were fed diets with varying Mg levels (0.05%, 0.025%, 0.01%) for 21 days.
- Bone formation marker (serum osteocalcin) and bone resorption marker (urinary C-terminal telopeptide of type 1 collagen) were measured.
- Serum levels of IGF-1 and sRANKL were analyzed.
Main Results:
- Decreased dietary Mg significantly reduced serum osteocalcin levels.
- Urinary C-terminal telopeptide of type 1 collagen excretion increased with severe Mg restriction (1/5Mg group).
- Serum IGF-1 levels decreased, while serum sRANKL levels increased in Mg-restricted groups.
Conclusions:
- Moderate magnesium restriction impairs bone formation and enhances bone resorption.
- Reduced IGF-1 may contribute to decreased bone formation.
- Elevated sRANKL may contribute to increased bone resorption.
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