title: Decreased postprandial response to a fat meal in normotriglyceridemic men with hypoalphalipoproteinemia.
abstract: The plasma level of high density lipoprotein cholesterol (HDL-C) has been reported to be inversely correlated with the level of triglycerides (TGs) and the magnitude of postprandial lipemia because subjects with low HDL-C accompanying high TG levels often have an increased postprandial response to a fat load. However, information is limited regarding the postprandial response to a fat load in subjects with low HDL-C and normal fasting TG values (hypoalphalipoproteinemia [hypoalpha]). We administered an oral fat load (70 g/m2 of body surface area) to six subjects with hypoalpha and six aged-matched control subjects. Plasma levels of lipids and lipoproteins and the mass of triglyceride-rich lipoproteins (TRLs: Sf > 100 and Sf 20-100) were measured every 2 hours for 8 hours. The mass and chemical composition of Sf > 100 or Sf 20-100 TRLs were not different between the fasting groups; postprandial Sf > 100 but not Sf 20-100 TRLs (mean +/- SD) was significantly lower in subjects with hypoalpha (200.4 +/- 64.8 mg/dL versus 110.6 +/- 50.9 mg/dL; analysis of variance, F test, p = 0.04). In the hypoalpha subjects, the compositions of postprandial Sf > 100 TRLs were TG poor and cholesterol and phospholipid enriched (p < 0.001) while the Sf 20-100 TRLs were enriched in cholesterol and phospholipid but relatively protein depleted (p = 0.002).(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore MD.
authors.forename: M
authors.initials: M
authors.lastname: Miller
authors.forename: P O
authors.initials: PO
authors.lastname: Kwiterovich
authors.forename: P S
authors.initials: PS
authors.lastname: Bachorik
authors.forename: A
authors.initials: A
authors.lastname: Georgopoulos
mesh_terms: D000328:Adult; D002784:Cholesterol / Q000097:blood; D008076:Cholesterol, HDL / Q000097:blood; D004041:Dietary Fats / Q000494:pharmacology*; D004435:Eating; D005215:Fasting; D006801:Humans; D007009:Hypolipoproteinemias / Q000097:blood*; D008055:Lipids / Q000097:blood; D008074:Lipoproteins / Q000097:blood; D008297:Male; D014280:Triglycerides / Q000097:blood*
chemical_list: D008076:Cholesterol, HDL; D004041:Dietary Fats; D008055:Lipids; D008074:Lipoproteins; D014280:Triglycerides; D002784:Cholesterol