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Clinical Chemistry 38: 2244-2248, 1992;
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Clinical Chemistry, Vol 38, 2244-2248, Copyright © 1992 by American Association for Clinical Chemistry

Apolipoprotein(a) is present in urine and its excretion is decreased in patients with renal failure

K Oida, H Takai, H Maeda, S Takahashi, A Shimada, J Suzuki, T Tamai, T Nakai and S Miyabo
Third Department of Internal Medicine, Fukui Medical School, Japan.

To investigate the relation between renal function and concentrations of lipoprotein(a) [Lp(a)] in serum, we measured Lp(a) in samples of serum and urine from patients with diabetes mellitus and in samples sent to a laboratory center for measurements of creatinine clearance. Serum Lp(a) concentrations were significantly increased in subjects with obvious renal dysfunction (serum creatinine > or = 176.8 mumol/L) compared with normal control subjects. Urinary Lp(a) excretion was decreased in subjects with obvious renal dysfunction compared with subjects without obvious renal dysfunction (serum creatinine < or = 88.4 mumol/L) and was negatively and positively correlated with serum creatinine and creatinine clearance, respectively. More than 80% of urinary Lp(a) was recovered in the d > 1.21 kg/L fraction. At least six bands for apolipoprotein(a) [apo(a)] fragments, which were smaller than native apo(a) in serum, were observed in urine by immunoblotting, and some of these were also detected in serum. Degraded apo(a) fragments are probably present in urine, and their excretion decreases in parallel with decreases in the glomerular filtration rate.


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