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Defective high-density lipoprotein composition in patients on chronic hemodialysis. A possible mechanism for accelerated atherosclerosis.
We determined serum high-density lipoprotein cholesterol content and analyzed the approtein structure of the various lipoprotein fractions in 21 patients on chronic hemodialysis. High-density lipoprotein cholesterol was significantly reduced in all patients as compared with 11 normal persons (mean +/-1 standard deviation: 26 +/- 13 vs. 52 +/- 9 mg per 100 ml; P less than 0.001) whether or not triglyceride levels were raised. In seven of those with Type IV hyperlipoproteinemia, protein content of high-density lipoprotein and its subfractions 1, 2 and 3 were also reduced (P less than 0.001) in parallel with reductions in cholesterol in these fractions. Apoprotein electrophoresis showed an increase in "arginine-rich" peptide in very-low-density lipoprotein and high-density lipoprotein fraction 1, and a reduction in apoprotein Cll in very-low-density and high-density lipoprotein. In addition to their reduced high-density lipoprotein cholesterol levels, a major factor in the atherosclerosis of these patients may be their abnormal high-density lipoprotein composition. Their raised triglyceride levels could be due to defective lipoprotein lipase activation by the reduced very-low-density lipoprotein apoprotein.[1]References
- Defective high-density lipoprotein composition in patients on chronic hemodialysis. A possible mechanism for accelerated atherosclerosis. Rapoport, J., Aviram, M., Chaimovitz, C., Brook, J.G. N. Engl. J. Med. (1978) [Pubmed]
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