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[Quantitative evaluation of the surface membrane receptors of leukemic cells to blood serum transcobalamin-II].

Serum protein transcobalamin II (TC-II) is responsible for transport of cobalamins into mammalian cells. A method of quantitative estimation of plasma membrane receptors of hemopoietic cells to TC-II cobalamin complex is suggested. Analysis of mouse leukemia L1210 cells includes the saturation of radiolabelled ligand-receptor complex with papain. The number of receptors and 57CoCNCbl content in one cell is determined by differentiated radioactivity count of solubilized protein complexes and of cytoplasm.