Is it LDL particle size or number that correlates with risk for cardiovascular disease?

Area of Science:

• Cardiovascular Medicine
• Lipidology
• Biochemistry

Background:

• Low-density lipoprotein cholesterol (LDL-C) is a well-established factor in cardiovascular disease (CVD) pathogenesis.
• Despite successful LDL-C lowering therapies, many high-risk patients still experience clinical events.
• Current measures of LDL characteristics may not fully identify all individuals at risk or those who would benefit from specific treatments.

Purpose of the Study:

• To evaluate whether LDL particle size and number (LDL-Num) are superior predictors of CVD risk compared to LDL-C.
• To determine if LDL-Num, measured via apoprotein B, offers a more comprehensive assessment of atherogenicity.

Main Methods:

• Assessment of LDL particle size and number (LDL-Num) as measures of atherogenicity.
• Determination of plasma apoprotein B as a proxy for LDL-Num, as each LDL particle contains one apoprotein B-100 molecule.
• Comparison of the predictive value of LDL-C, LDL particle size, and LDL-Num for CVD risk.

Main Results:

• LDL particle size and number provide independent measures of atherogenicity.
• LDL-Num, assessed by apoprotein B, is suggested as a more reliable indicator of atherogenicity than LDL-C alone.
• Interindividual variation in cholesterol content per LDL particle means LDL-C and LDL-Num provide non-equivalent information regarding absolute CVD risk.

Conclusions:

• LDL particle number and size are strong, independent predictors of cardiovascular disease.
• Measuring LDL particle number (via apoprotein B) may offer a more accurate assessment of an individual's absolute CVD risk than LDL-C alone.
• Further investigation into LDL characteristics beyond LDL-C is warranted for comprehensive CVD risk stratification and targeted therapy.