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Partial lecithin:cholesterol acyltransferase (LCAT) deficiency in Balkan endemic nephropathy.

The role of lipid abnormalities has been also implicated in the progression of renal diseases. The search for lipid abnormalities in Balkan endemic nephropathy (BEN) has roused sporadic interest and has not been fully elucidated. This study was performed in 54 healthy subjects from the families affected with BEN (group A), 18 members from non-affected families living in the same location (group B), and 25 control subjects (group C). Lipid profiles and lecithin:cholesterol acyltransferase (LCAT) were determined in each subject. The most striking distinction between the groups was that of the LCAT activity, which was abnormally low in group A (39 +/- 2), significantly different (P less than 0.0001) from that of the other groups. Thirty individuals from group A were those accounting for the low LCAT activity (A1). This group had a significantly lower total cholesterol and free cholesterol than all of the other subjects. The entire group A subjects had a significantly lower percentage of free cholesterol than the other two groups. There was no significant difference in HDL cholesterol between any of the groups, but group A1 had significantly higher HDL than group C (P less than 0.04). What emerges from our study is that a certain proportion of subjects from BEN families have a peculiar form of lipid abnormalities associated with an abnormal LCAT activity. At present we have no explanation for these findings. We believe that these changes may have an important role in the pathogenesis of BEN.