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Age-related Increases in Plasma Phosphatidylcholine Hydroperoxide Concentrations in Control Subjects and Patients with Hyperlipidemia

¹ Biodynamic Chemistry Laboratory, Tohoku University Graduate School of Life Science and Agriculture, Tsutsumidori-Amamiyamachi, Aobaku, Sendai 981-8555, Japan.

² The Third Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aobaku, Sendai 980-8574, Japan.
^a Address correspondence to this author at: The Third Department of Internal Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyoku, Tokyo 113-0022, Japan. Fax 81 3-5685-1793; e-mail shinichi{at}nms.ac.jp

Background: The basal lipid peroxide concentration in the plasma of patients with hyperlipidemia may be related to atherosclerosis. Quantitative determination of lipid peroxides in the plasma is an important step in the overall evaluation of the biochemical processes leading to oxidative injury. Unfortunately, the currently available methods for lipid peroxidation lack specificity and sensitivity.

Methods: Hyperlipidemic patients (44 males and 50 females), ages 12–82 years (mean ± SE, 53 ± 2.3 years for males, 58 ± 2.0 years for females, and 56 ± 14 years for total cases), and normolipidemic volunteers (controls, 32 males and 15 females), ages 13–90 years (49 ± 4 years for males, 65 ± 4 years for females, and 55 ± 24 years for total cases), were recruited in the present study. Plasma phosphatidylcholine hydroperoxide (PCOOH) was determined by chemiluminescence-HPLC (CL-HPLC).

Results: Plasma PCOOH concentrations increased with age in both controls and hyperlipidemic patients. However, the mean plasma PCOOH concentration in patients with hyperlipidemia (331 ± 19 nmol/L; n = 94) was significantly (P <0.001) higher than in the controls (160 ± 65 nmol/L; n = 47). Plasma PCOOH concentrations were similar in three hyperlipidemic phenotypes: hypercholesterolemia (IIa), hypertriglyceridemia (IV), and combined hyperlipidemia (IIb). The mean plasma PCOOH in patients with treatment-induced normalized plasma lipids was 202 ± 17 nmol/L. There was no significant correlation between plasma PCOOH concentration and total cholesterol, triglycerides, or phospholipids in hyperlipidemic patients. For all subjects, there was a significantly positive correlation between plasma PCOOH and each lipid (total cholesterol, P = 0.0002; triglycerides, P = 0.0137; and phospholipids, P <0.0001). Analysis of fatty acids composition of plasma phosphatidylcholine showed significantly low concentrations of n-6 fatty acids moieties (linoleic acid and arachidonic acid) in patients compared with controls.

Conclusions: Our results suggest that an increase in plasma PCOOH in patients with hyperlipidemia may be related to the development and progression of atherosclerosis, particularly in the elderly. Measurement of plasma PCOOH is useful for in vivo evaluation of oxidative stress.

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