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Clinical Chemistry 40: 593-597, 1994;
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Clinical Chemistry, Vol 40, 593-597, Copyright © 1994 by American Association for Clinical Chemistry

Two-site enzyme immunoassay of cholesteryl ester transfer protein with monoclonal and oligoclonal antibodies

H Mezdour, I Kora, HJ Parra, A Tartar, YL Marcel and JC Fruchart
Institut Pasteur de Lille, Serlia et Inserm U-325, France.

We developed a sandwich-type enzyme immunoassay to measure cholesteryl ester transfer protein (CETP) mass in human plasma. A specific monoclonal antibody (TP-4) that recognizes an epitope located in the C- terminal domain was used for antigen capture and an anti-CETP peptide antibody directed against the 290-306 residue was used for detection. Bound antibodies were revealed with an antibody-peroxidase conjugate specific for rabbit IgG. The presence of 10 mL/L Triton X-100 in the incubation buffer increased antigen exposure of CETP in plasma. The curves for CETP in standard plasma and partially purified CETP were parallel. This technique is rapid (results within 6 h), accurate, precise (mean intra- and interassay CVs 3.6% and 8.4%, respectively), and simple to perform. Assay sensitivity is at microgram concentrations, with a working range of 20-200 micrograms/L. In 40 normolipidemic healthy subjects, the mean CETP concentration in plasma was 1.1 +/- 0.4 mg/L. A strong correlation between CETP concentration and CETP activity (r = 0.91, n = 42) was observed. In plasma, the bulk of CETP was found in high-density lipoprotein fractions. Therefore, this assay may be a useful tool for investigations of CETP and its significance in relevant diseases.


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