Severe magnesium deficiency compromises systemic bone mineral density and aggravates inflammatory bone resorption

Area of Science:

• Biochemistry
• Oral Biology
• Bone Metabolism

Background:

• Periodontal disease (PD) is a common inflammatory condition affecting the gums and supporting bone structures.
• Magnesium (Mg) plays a crucial role in bone metabolism and overall health.
• The impact of Mg deficiency on bone metabolism, particularly in the context of PD, requires further investigation.

Purpose of the Study:

• To evaluate the effects of magnesium (Mg) intake deficiency on bone metabolism in rats with experimentally induced periodontal disease (PD).

Main Methods:

• Rats were fed a standard diet or a diet with 90% Mg deficiency for 60 days.
• Periodontal disease was induced using ligatures on molars.
• Bone mineral density (BMD), bone microarchitecture, and cellular/molecular markers of bone metabolism and inflammation were assessed.
• Biochemical markers in blood and urine were analyzed.

Main Results:

• Mg deficiency significantly decreased systemic and mandibular BMD, increasing bone loss and altering bone architecture.
• Elevated parathyroid hormone (PTH) and deoxypyridinoline (DPD) levels were observed in Mg-deficient rats.
• Increased osteoclast activity, iNOS expression, and IL-6 mRNA were noted, alongside decreased OCN and RUNX2 expression.
• Mg deficiency aggravated inflammatory bone resorption in the PD model.

Conclusions:

• Magnesium deficiency negatively impacts systemic bone metabolism and exacerbates bone loss in a ligature-induced periodontal disease model.
• Mg deficiency affects immune and stromal cells, contributing to heightened inflammatory bone resorption.
• Maintaining adequate magnesium levels is crucial for bone health, especially in individuals with or at risk for periodontal disease.