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- W2167152675 abstract "Summary. Polycythaemia vera (PV) patients' blood burstforming units-erythroid (BFU-E) have an enhanced sensitivity to stem cell factor (SCF) compared to normal BFU-E. To characterize SCF receptors on erythroid progenitors from normal individuals and PV patients, we performed binding experiments using radioiodinated recombinant SCF (rSCF), day 1 BFU-E and day 8 erythroid colony-forming cells (ECFC), which are mostly colony-forming units-erythroid (CFU-E). 125I-rSCF binds to a single class of cell surface receptors (23 000/ECFC) at 0d́;C with a high-binding affinity (Kd= 17pm). Saturation occurred at 0.5 nm (10ng/ml) which produces a nearly maximum biological effect. One half of the radiolabelled rSCF was internalized by the cells after 30 min at 37d́;C. No significant differences in the receptor number, dissociation constant, or internalization rate were found between normal and PV ECFC. Autoradiographic analysis of 125I-rSCF binding to normal BFU-E and ECFC showed that no differences were present in either the percentage of positive cells or the number of radioactive grains/cell between the normal and PV erythroid progenitors. The enhanced sensitivity of PV BFU-E and CFU-E to SCF does not appear to be related to changes in SCF receptor number, binding affinity or internalization and the hypersensitivity of PV erythroid progenitors to SCF must reside in a further internal cellular abnormality." @default.
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- W2167152675 date "1994-11-01" @default.
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- W2167152675 title "Polycythaemia vera. IV. Specific binding of stem cell factor to normal and polycythaemia vera highly purified erythroid progenitor cells" @default.
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- W2167152675 doi "https://doi.org/10.1111/j.1365-2141.1994.tb05065.x" @default.
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