title: An improved method for the rapid assessment of persisting chylomicron remnant concentrations.
abstract: Persisting chylomicron remnant concentrations have been linked to premature atherosclerosis. The analysis of persisting chylomicron remnant concentrations by an oral triglyceride tolerance test, however, is time-consuming for the study subjects and requires large resources in the laboratory. Therefore, only small numbers of subjects have been studied in the past. We describe major improvements of the testing procedure in regard of composition of the fatty meal, of patient testing, and measurement of postprandial remnants. Shifting the time of the (ready-to-use) fatty drink from the morning hours to bedtime was well accepted by the study subjects and allowed the analysis of blood samples drawn at the morning with minimal impact on the participants' time and with minimal interferences by confounding factors (e.g. smoking, additional food intake, physical activity). Chylomicron remnants were measured by fluorometry of the supernatant after ultracentrifugation. This procedure was sensitive, was specific for chylomicron remnants, and was easy to perform. The biological validity of the improved procedure was evaluated by studying type III hyperlipoproteinemia patients and normolipemic apolipoprotein (Apo) E2 homozygotes. In conclusion, this improved test permits the rapid testing for persisting chylomicron remnants in the clinical routine and in large epidemiological studies.
authors.affiliation: University of Leipzig, Institut für Laboratoriumsmedizin, Klinische Chemie und Molekulare Diagnostik, Universitätsklinikum Leipzig (AöR), 27, D-04103 LEIPZIG, Liebigstrasse, Germany. orth@medizin.uni-leipzig.de
authors.forename: M
authors.initials: M
authors.lastname: Orth
authors.forename: C
authors.initials: C
authors.lastname: Weinland-Wilken
authors.forename: S
authors.initials: S
authors.lastname: Westphal
authors.forename: C
authors.initials: C
authors.lastname: Luley
mesh_terms: D000328:Adult; D000368:Aged; D053329:Apolipoprotein E2; D053318:Apolipoprotein E3; D001057:Apolipoproteins E / Q000032:analysis*; D002850:Chromatography, Gel; D053298:Chylomicron Remnants; D002914:Chylomicrons / Q000032:analysis*; D004041:Dietary Fats / Q000097:blood*; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006720:Homozygote; D006801:Humans; D006952:Hyperlipoproteinemia Type III / Q000097:blood*; D015151:Immunoblotting; D008074:Lipoproteins / Q000097:blood*; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D019518:Postprandial Period / Q000502:physiology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence; D011795:Surveys and Questionnaires; D014461:Ultracentrifugation
chemical_list: D053329:Apolipoprotein E2; D053318:Apolipoprotein E3; D001057:Apolipoproteins E; D053298:Chylomicron Remnants; D002914:Chylomicrons; D004041:Dietary Fats; D008074:Lipoproteins