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Department of Medicine, University of Manchester, Royal Infirmary, U.K.
The activity of serum paraoxonase, an enzyme located on high-density lipoprotein, has been investigated in familial hypercholesterolaemia (FH) and insulin dependent diabetes mellitus (IDDM). Increases in total serum cholesterol and apolipoprotein B were present in both FH and IDDM compared to healthy controls and in the patients with IDDM, serum triglycerides were also raised. The serum HDL-cholesterol concentrations in controls and patients with FH and IDDM did not differ significantly. Serum paraoxonase activity was significantly lower in both the FH and IDDM populations than in controls (P less than 0.001 and P less than 0.01, respectively). 72% of the FH population and 67% of the IDDM population were in the lower half of the frequency distribution for serum paraoxonase (activity of less than 112 U/l). It is likely that the common factor related to low paraoxonase activity is hyperlipidaemia. It is possible that paraoxonase has a physiological role in lipid metabolism and that decreases in its activity may accelerate atherogenesis.
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