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Biomedical subjects

U Sule

Publications and source records attributed to U Sule.

4 recordsLinked to original sources
PubMed1983

Lack of correlation between the maximum low-density lipoprotein (LDL) receptor activity of blood lymphocytes and plasma LDL concentration in normal men.

1. Measurements were made of the maximal low-density lipoprotein (LDL) receptor activities of blood lymphocytes from 81 healthy men with a wide range of plasma LDL cholesterol concentrations (1.45-7.55 mmol/l). 2. Receptor activity was quantified by measuring the degradation of 125I-labelled LDL (10 micrograms of protein/ml) to trichloroacetic acid-soluble material during a 6 h incubation, after derepression of the lymphocytes for 72 h in lipoprotein-deficient medium. 3. No significant correlation existed between LDL receptor activity in vitro and plasma LDL cholesterol concentration in vivo (r = -0.08).

Adult↗
PubMed1982

Myelomatosis with type III hyperlipoproteinemia: clinical and metabolic studies.

We investigated the metabolism of intermediate-density lipoproteins (IDL [1.006 to 1.019 g per milliliter]) and low-density lipoproteins (LDL [1.019 to 1.063 g per milliliter]) in two men with Type III hyperlipoproteinemia associated with myelomatosis. In vivo kinetic studies using radiolabeled autologous lipoproteins demonstrated a greatly reduced fractional catabolic rate of IDL, relative to control values (patients vs. normal, 0.006 and 0.025 per hour vs. 0.20 +/- 0.08 per hour [mean +/- S.E.M]) and a greatly prolonged IDL-to-LDL conversion time (45 and 17 hours vs. 5.4 +/- 1.6 hours). In studies in vitro, LDL from both patients failed to bind to the LDL receptor of normal blood lymphocytes, whereas LDL from subjects with familial Type III hyperlipoproteinemia bound normally to the receptor. In one patient immunoglobulin was shown to be associated with IDL and LDL. Thus, hyperlipoproteinemia reflected an impaired metabolism of IDL, probably secondary to the binding of immunoglobulin to the lipoproteins. A similar impairment of receptor-mediated LDL catabolism did not elevate the plasma LDL concentration because of the low IDL-to-LDL conversion rate.

Apoproteins↗
PubMed1982

Heritability of the low density lipoprotein receptor activity of human blood mononuclear cells: studies in normolipidaemic adult male twins.

1. The concordance of low density lipoprotein (LDL) receptor activity of blood mononuclear cells was examined in 26 pairs of monozygotic and 17 pairs of dizygotic normolipidaemic young adult male twins. 2. Receptor activity was quantified as the degradation of 125I-labelled LDL during a 6 h incubation, after derepression of the cells for 72 h in lipoprotein-deficient medium. 3. The total variance of receptor activity was similar in the two groups of twins. In contrast, within-pair variance was five times greater in dizygotic twins than in monozygotic twins (P less than 0.001). 4. Estimates of heritability, mostly based on the intra-class correlation coefficients (monozygotic, r = 0.83; dizygotic, r = 0.39), ranged from 0.72 to 1.05. 5. These results suggest that the maximal LDL receptor activity of peripheral cells in normolipidaemic subjects is largely genetically determined.

Adolescent↗