PLTP activity inversely correlates with CAAD: effects of PON1 enzyme activity and genetic variants on PLTP activity

Area of Science:

• Cardiovascular Disease Research
• Lipid Metabolism Studies
• Genetic Epidemiology

Background:

• High-density lipoprotein (HDL) cholesterol's direct cardioprotective effect is debated, prompting research into HDL's functional aspects.
• Phospholipid transfer protein (PLTP) is an HDL-associated protein crucial for reverse cholesterol transport.
• Understanding predictors of PLTP activity and its association with cardiovascular disease is essential.

Purpose of the Study:

• To identify genetic and non-genetic predictors of plasma PLTP activity (PLTPa).
• To determine if PLTPa predicts carotid artery disease (CAAD).
• To explore the relationship between PLTPa, its predictors, and CAAD.

Main Methods:

• Case-control study involving 1,115 European ancestry participants.
• Multivariate logistic regression to assess PLTPa's association with CAAD.
• Stepwise linear regression to identify predictors of PLTPa, including clinical, laboratory, and genetic variables (SNPs).

Main Results:

• PLTPa was significantly inversely associated with CAAD (OR=0.91 per unit increase, P=7.90 × 10⁻⁹).
• Predictors of PLTPa included triglyceride levels, diabetes, paraoxonase 1 (PON1) activity, statin use, and specific PLTP and PCIF1 gene variants (SNPs).
• A novel association was found between PLTPa and PON1 activity.

Conclusions:

• PLTPa is a significant inverse predictor of CAAD, suggesting a cardioprotective role.
• PLTPa is influenced by a combination of genetic and non-genetic factors.
• The association between PLTPa and PON1 activity warrants further investigation for its role in cardiovascular health.