ABSTRACT
Blood serum from children and young patients with chronic kidney insufficiency at the terminal step as well as from healthy donors was fractionated using ultrafilters "Amicon" XM-50 and Sephadex G-25. Three fractions were obtained: F1--molecular mass 50,000-5,000, F3--3,000-800 (fraction of middle mass molecules, MM) and F5 < 200. Amount of protein in the MM fraction exceeded 7-10-fold the protein content in the same fraction of donor blood serum. Hemodialysis decreased dissimilarly the MM concentration in blood serum of various patients, but the content of this fraction was decreased approximately by 37% after the treatment; the constant value was obtained as a result of calculation per an hour of hemodialysis and per kg of body mass. These data suggest that elimination of the MM fraction from blood serum of patients with chronic kidney insufficiency depends on the period of the short-term hemodialysis.
Subject(s)
Kidney Failure, Chronic/therapy , Renal Dialysis , Adolescent , Blood Proteins/analysis , Child , Child, Preschool , Humans , Kidney Failure, Chronic/blood , Molecular Weight , Time FactorsABSTRACT
Serum of 18 children and adolescents with chronic renal failure at the terminal stage of the kidney disease was fractionated on plates manufactured by Amicon Company and on Sephadex G-25. Uremic serum and ultrafiltrate with a molecular mass of 50,000 produced erythropoiesis inhibiting effect in polycythemic mice. However, the uremic serum and its fractions (50000--5000 and 3000--800) did not alter the number of microscopically visible colonies in the spleen of irradiated mice and their differentiation and proliferation compared to the mice that had received donor serum. Thus the inhibitory effect of serum and its fractions of patients with chronic renal failure is possible effected at the level of undifferentiated erythroid precursors producing no effect on the pluripotent stem cell.