Previous studies have indicated that there is a relation between testicular function and adequate concentrations of zinc in testicular cells, and that calcitonin alters cellular zinc transfer in the testis. The present studies provide autoradiographic evidence that calcitonin binds in vivo to the cell membrane of testicular Leydig cells. The data thus confirm the presence of the testicular cell...

The effects of clonidine on substance P (SP) binding was investigated using rat brain and spinal cord membrane preparations preincubated with various concentrations of clonidine. [3H]SP specific binding in the spinal cord was significantly decreased with 10(-4) M clonidine, but no effect on binding was seen in the brain. Scatchard analysis of SP binding indicated that Bmax was significantly dep...

The ryanodine receptor was isolated from the sarcoplasmic reticulum of crayfish skeletal muscle. Ryanodine binding to the native fraction was measured by Scatchard analysis and values of 60 nmol/l and 9 pmol/mg were obtained for KD and Bmax respectively. The identity of purified receptor was confirmed by electron microscopy, electrophoresis and incorporation into planar lipid bilayers. At least...

In saturation analysis the Scatchard plot is a generally accepted method for calculation of the affinity constant, K, and the molar concentration, q, of the binder. However, in a system where the K's for the labeled and unlabeled ligand are unequal, a nonlinear plot can be obtained from which incorrect values for K and q may be calculated. This paper mathematically explains how the plot may dev...

Fragments of 125I-labeled insulin (125I-insulin) are rapidly produced after the initial cell binding process. After association of 125I-insulin with hepatocytes, hormone fragments remain bound to cells. At 23 degrees C, approximately 20% of the label bound at steady state was soluble in trichloroacetic acid. Correction of saturation experiments for the presence of bound trichloroacetic acid-sol...

The binding of 125I-asialoorosomucoid and the isolated rabbit hepatic lectin were studied at 0 degrees C. The steady state binding data were analyzed both by a direct curve-fitting procedure that utilizes nonlinear least squares regression analysis, and by conventional Scatchard plot analysis. Two classes of binding sites, present in approximately equal concentrations, were detected by both ana...

The insulin receptors in two strains of Zajdela ascites hepatoma cells have been studied. Specific binding of insulin was investigated at 4,15, and 22°,and the amount of insulin bound at steady state was proportional to the cell concentration. The optimum pH was 7.6. Scatchard analysis of the insulin binding exhibited cur vilinear plots. The number of insulin receptors was mark edly reduced in...

PURPOSE To biochemically characterize the receptor for connective tissue growth factor (CTGF) of human corneal fibroblasts (HCF). METHODS Radiolabeled recombinant human CTGF was used to determine the specificity and time course of binding to low-passage cultures of HCF. The affinity and number of receptors present were calculated by Scatchard and best-fit analyses. In vitro immunoprecipitatio...