title: Important contribution of lipoprotein particle number to plasma triglyceride concentration in type 2 diabetes.
abstract: The aim of the present study was to determine the contributions of particle size versus number to differences in plasma triglyceride-rich lipoprotein concentrations in patients with type 2 diabetes. Fasting plasma was obtained from 174 consecutive eligible men and women with type 2 diabetes (with or without insulin treatment, mean age 57.0 + 6.3 years) who were undergoing coronary angiography. The triglyceride-rich (Sf 12-400) lipoproteins (TRL) were subfractionated into the Sf 12-60 and Sf 60-400 subfractions. Particle numbers, estimated by measuring apolipoprotein B by electroimmunoassay, in each of these lipoprotein fractions were related to enzymatically determined triglyceride levels in the triglyceride-rich lipoproteins. Approximately 87% of the triglyceride-rich lipoprotein particles were in the Sf 12-60 fraction and 13% in the Sf 60-400 fraction. Multiple linear regression indicated that 69% (i.e. r2=0.69) of the variance in the triglyceride levels could by explained by differences in TRL particle number and 17% (i. e. r2=0.17) by the differences in particle triglyceride content. These observations are similar in each gender and in those with or without insulin treatment. In conclusion, in type 2 diabetes, the vast majority of triglyceride-rich lipoproteins are smaller particles which are in the Sf 12-60 fraction. Differences in particle number, rather than triglyceride content, account for approximately 70% of the differences in triglyceride levels observed between individuals. Previous demonstrations, in those without diabetes, of an association between small triglyceride-rich lipoproteins with coronary artery disease suggest the importance of these findings to the increased atherosclerosis in diabetes.
authors.affiliation: WHO Collaborating Center for the Study of Atherosclerosis in Diabetes, Department of Medicine, The Toronto Hospital (General Division), University of Toronto, Ont., Canada.
authors.forename: G
authors.initials: G
authors.lastname: Steiner
authors.forename: I
authors.initials: I
authors.lastname: Tkác
authors.forename: K D
authors.initials: KD
authors.lastname: Uffelman
authors.forename: G F
authors.initials: GF
authors.lastname: Lewis
mesh_terms: D000328:Adult; D000368:Aged; D001055:Apolipoproteins B / Q000097:blood; D003627:Data Interpretation, Statistical; D003924:Diabetes Mellitus, Type 2 / Q000097:blood*; D005260:Female; D006801:Humans; D008074:Lipoproteins / Q000097:blood*; D008297:Male; D008875:Middle Aged; D013347:Subcellular Fractions / Q000737:chemistry; D014280:Triglycerides / Q000097:blood*
chemical_list: D001055:Apolipoproteins B; D008074:Lipoproteins; D014280:Triglycerides