Abstract
Background: There have been no previous reports showing specifically the relation between lipoprotein
lipase (LPL) and apolipoprotein (apo) B-48 or remnant metabolism. In this study, we
have clarified the relationships of LPL mass in pre-heparin with serum apo B-48 measured
by enzyme-linked immunosorbent assay, triglycerides (TG), and remnant-like particle
triglycerides (RLP-TG).
Material and Methods: Seventy-nine type 2 diabetic subjects [age, 55±13; body mass index (BMI), 25±5.0
kg/m2 ; fasting plasma glucose (FPG), 7.39±2.22 mmol/l, HbA1c, 6.5±1.3%, total cholesterol
(TC), 5.36±1.09 mmol/l, TG, 2.32±2.53 mmol/l; HDL-C, 1.22±0.44 mmol/l; serum LPL mass,
45±22 ng/ml; apo B-48, 6.6±6.3 μg/ml] were recruited in this study. Fasting serum
apo B-48 were measured by ELISA using anti-human apo B-48 monoclonal antibodies (MoAb)
and LPL mass by ELISA using anti-bovine milk LPL MoAb. RLP-TG levels were measured
using monoclonal antibodies to apo B-100 and apo A-1.
Results: There was no relationship of LPL mass to age, BMI, FPG, and HbA1c. Serum LPL mass
was correlated inversely with TG (r=-0.529 p<0.0001) and positively with HDL-C (r=0.576,
p<0.0001). Also, LPL mass showed inverse correlations with apo B-48 (r=-0.383 p<0.0001)
and RLP-TG (r=-0.422 p<0.0001, n=51). Multiple regression analysis with TG, apo B-48,
or RLP-TG as dependent variables, and age, gender, BMI, plasma glucose, and LPL mass
as independent variables showed that LPL mass was associated independently with TG,
apo B-48, or RLP-TG.
Conclusion: The decrease in LPL protein mass could cause an increase in serum apo B-48 and RLP-TG
levels, which is related to the retardation of remnant metabolism.
Key words
Chylomicrons - ELISA - plasma glucose - body mass index - HDL-cholesterol
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Correspondence
J. Kobayashi
Department of Lipidology
Kanazawa University Graduate School of Medical Science
Takara-machi 13-1
920-8640 Kanazawa
Japan
Phone: +81/76/265 22 68
Fax: +81/76/234 42 71
Email: junji@med.kanazawa-u.ac.jp