Enzyme immunoassay for cholesteryl ester transfer protein in human serum

Area of Science:

• Biochemistry
• Clinical Chemistry
• Immunology

Background:

• Cholesteryl ester transfer protein (CETP) plays a crucial role in lipoprotein metabolism.
• Accurate measurement of CETP mass is important for understanding lipid-related diseases.

Purpose of the Study:

• To develop and validate a simple sandwich-type enzyme immunoassay for quantifying CETP mass in human serum.
• To assess the assay's specificity, reproducibility, and correlation with CETP activity.

Main Methods:

• Development of a novel sandwich-type enzyme immunoassay.
• Assay validation including intra- and inter-assay variability, and cross-reactivity testing.
• Correlation analysis between measured CETP mass and CETP activity.

Main Results:

• The assay demonstrated low coefficients of variation (2.7–5.7% intra-assay, 2.2–12.2% inter-assay).
• No significant cross-reactivity was observed with major lipoproteins.
• A strong correlation (r=0.88) was found between CETP mass and CETP activity.
• Normal CETP levels were established for males (1.8±0.6 μg/ml) and females (2.0±0.5 μg/ml).
• The assay accurately reflected CETP deficiency in patients with CETP gene mutations.

Conclusions:

• The developed enzyme immunoassay is a specific, reproducible, and valuable tool for measuring CETP mass in human serum.
• This assay can aid in clinical investigations of lipid metabolism and associated diseases.
• The findings contribute to a better understanding of CETP's role in cardiovascular health.