C. Marcoux et al., PLASMA REMNANT-LIKE PARTICLE LIPID AND APOLIPOPROTEIN LEVELS IN NORMOLIPIDEMIC AND HYPERLIPIDEMIC SUBJECTS, Atherosclerosis (Amsterdam), 139(1), 1998, pp. 161-171
Remnant-like particle (RLP) lipid and apolipoprotein (apo) levels were
determined in the plasma of normolipidemic and hyperlipidemic subject
s, in order to investigate the relationship between RLP levels and the
concentration of other plasma lipoprotein parameters. Plasma RLP frac
tions were isolated with the use of an immunoaffinity gel (RLP-Cholest
erol Jimro II, Japan Immunoresearch Lab.), containing specific anti-ap
oB-100 and anti-apoA-I antibodies. Four groups of human subjects were
selected, who had either matching or significantly different levels of
plasma triglyceride (TG) and low-density lipoprotein cholesterol (LDL
-C): (1) normolipidemic control (NC) subjects (n = 10), (2) patients w
ith elevated levels of LDL-C (type IIa, LDL-C (mean +/- S.E.), 4.65 +/
- 0.09 mmol/l, n = 10), (3) hypertriglyceridemic (HTG) patients with e
levated LDL-C (type IIb, TG: 3.86 +/- 0.36; LDL-C: 4.67 +/- 0.21 mmol/
l, n = 10), and (4) HTG patients with normal LDL-C (type IV, TG: 3.71
+/- 0.39 mmol/l, n = 10). NC subjects (RLP-C: 0.22 +/- 0.01; RLP-TG: 0
.24 +/- 0.03 mmol/l) had RLP apoB, apoC-III and apoE levels of 3.2 +/-
0.3, 1.8 +/- 0.3, and 1.4 +/- 0.1 mg/dl, representing 3.2 +/- 0.4, 14
.5 +/- 1.4 and 32.1 +/- 2.1% of total plasma levels, respectively. RLP
lipid and apolipoprotein concentrations were significantly higher in
HTG groups (type IIb and IV) compared to NTG groups (NC and type IIa)
(e.g. RLP-C: 0.50 +/- 0.07 and 0.58 +/- 0.11 vs. 0.22 +/- 0.01 and 0.2
1 +/- 0.01 mmol/l, respectively (P < 0.01); RLP apoB: 8.4 +/- 1.6 and
8.2 +/- 0.9 vs. 3.2 +/- 0.3 and 3.4 +/- 0.2 mg/dl, respectively (P < 0
.01)). No significant difference in RLP levels was observed between gr
oups having different LDL levels, and thus no correlation existed betw
een RLP-C and LDL-C levels (r = 0.24, n.s.). RLP-C and RLP apoB levels
were, however, correlated with VLDL-C and VLDL apoB (r = 0.86, P < 0.
001 and r = 0.70, P < 0.001, respectively). These results demonstrate
that elevated levels of both RLP lipids and apolipoproteins are charac
teristic of patients with increased levels of plasma triglyceride, and
not patients with increased levels of LDL. (C) 1998 Elsevier Science
Ireland Ltd. All rights reserved.