Low A-esterase activity in serum of patients with fish-eye disease.

The activity of HDL-associated paraoxonase in the lipoprotein fraction of serum from two patients with fish-eye disease (FED) was only 11% of the mean value for control subjects. Similarly, concentrations of apolipoproteins A-I and A-II in the serum of FED subjects were only 10% of those in normal subjects. Thus the ratio of enzyme activity to A-I and A-II is virtually the same in these two groups of subjects. This suggests that paraoxonase activity of the lipoprotein fraction is associated with one or both of these apolipoproteins.