Articles |
From the University Department of Medicine, Manchester Royal Infirmary (UK).
Correspondence to Michael I. Mackness, Department of Medicine, University of Manchester, Manchester Royal Infirmary, Oxford Rd, Manchester M13 9WL, UK.
Abstract Human serum paraoxonase is physically associated with HDL and has been implicated in the detoxification of organophosphates and possibly in the prevention of LDL lipid peroxidation. We investigated the serum activity and concentration of paraoxonase in 78 patients with type 1 diabetes mellitus, 92 with type 2 diabetes, and 82 nondiabetic control subjects. Paraoxonase activity was generally lower in diabetics than in control subjects. This decrease was unrelated to differences in paraoxonase phenotype distribution or its serum concentration. Rather, the difference in paraoxonase activity was explained by its specific activity, which was lower in diabetics, indicating either the presence of a circulating inhibitor or disturbance of the interaction of paraoxonase with HDL affecting its activity. Paraoxonase specific activity was lowest in patients with peripheral neuropathy, suggesting an association of paraoxonase with neuropathy. In control subjects but not patients with diabetes, paraoxonase correlated with HDL cholesterol and apolipoprotein A-1. Our results indicate that the low paraoxonase activity in diabetes is due to decreased specific activity. In other studies low serum paraoxonase activity has been associated with increased susceptibility to atherosclerosis, and the present results also suggest an association with peripheral neuropathy, which could be due to reduced capacity to detoxify lipid peroxides in diabetes.
Key Words: paraoxonase high-density lipoprotein apolipoprotein A-1 neuropathy diabetes mellitus
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