Causal link between lipid profile and bone mineral density: A Mendelian randomization study

Area of Science:

• Genetics and Bone Metabolism
• Cardiovascular Health and Skeletal Integrity

Background:

• Serum lipid levels are known to correlate with bone mineral density (BMD), a key indicator of skeletal health.
• The precise causal relationship between lipid profiles and BMD remains undetermined, necessitating further investigation.

Purpose of the Study:

• To investigate the potential causal effects between BMD and various serum lipid profiles, including low-density lipoprotein cholesterol (LDL-c), total cholesterol (TC), triglycerides (TG), and high-density lipoprotein cholesterol (HDL-c).
• To examine the influence of body mass index (BMI) on these causal relationships.

Main Methods:

• A Mendelian randomization (MR) analysis was employed to assess the causal links between lipid profiles and BMD.
• Genetic variants associated with lipid levels and BMD were utilized as instrumental variables.

Main Results:

• Significant causal effects were observed from LDL-c, TC, and TG to BMD.
• A reverse causal effect was found from BMD to HDL-c.
• These lipid-related causal effects on BMD were independent of body mass index (BMI).

Conclusions:

• The study provides evidence for a causal role of specific serum lipids (LDL-c, TC, TG) in influencing bone mineral density.
• The findings highlight the clinical relevance of monitoring blood lipid profiles for assessing bone health and osteoporosis risk.
• The independence from BMI suggests direct pathways linking lipids to bone metabolism.