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Presence of Apo B48, and relative Apo CII deficiency and Apo CIII enrichment in uremic very-low density lipoproteins.

In the present study, lipid and apolipoprotein composition of very low density lipoprotein (VLDL) was analyzed in 39 patients with end-stage renal failure by comparison with 41 healthy subjects. Uremic patients had an increase of serum triglycerides (TG) concentration by comparison with control values. This increase of serum TG was associated with an increase of VLDL which had a normal percent amount of main components. Furthermore a mid-band between VLDL and low density lipoproteins (LDL) on polyacrylamide gel was observed in 22 out of 39 uremic patients but in only 1 out of 41 control subjects. In uremic VLDL Apo B48 was more frequently observed than in control VLDL (p less than 0.05). Furthermore, the content of Apo CII expressed as percent of total Apo C was significantly (p less than 0.001) decreased in uremic VLDL (19.13 +/- 4.54 p. cent) as compared to normal VLDL (23.57 +/- 4.40 p. cent). Apo CIII-O was significantly (p less than 0.001) increased (9.58 +/- 7.19 p. cent vs 5.55 +/- 6.12 p. cent, whereas Apo CIII-1 and Apo CIII-2 distribution was not modified in uremic VLDL. These anomalies were present in uremic patients even when no elevation of fasting serum TG was present. No significant change was observed in uremic patients before their fifth as compared to their first hemodialysis (HD) session, respectively, for any of the parameters studied. Advanced chronic renal failure is associated with a variety of anomalies of TG-rich lipoproteins isolated at d less than 1.006 g/ml which are not reflected by the degree of hypertriglyceridemia and are not corrected by the first four HD sessions.