Fig. 4.
ET-1 binding in normal and sickle erythrocytes.
Specific binding of [125I]–ET-1 as a function of radiolabeled ET-1 concentration. Scatchard plot of the specific binding of iodinated ET-1 gave a Kd of 244 ± 105 nM and 336 ± 78 sites/per cell for sickle red cells. TheKd for normal red cells was 128 ± 73 nM, with a maximal binding capacity of 238 ± 53 sites/cell. No statistically significance differences were found between sickle and normal erythrocytes. The line represents the nonlinear regression of experimental points. Values are mean ± SE of 3 similar experiments.