TABLE 1

Affinities and Hill coefficients determined after fitting the saturation and Scatchard curves when performing saturation experiments with 25I-HO-LVA, [3H]AVP, and 125I-OTA on membranes of CHO cells expressing human V1a receptors

Two data analyses were performed. The first one (“cooperative binding site” analysis) took into account a possible cooperativity between ligand binding sites; the second (independent binding site analysis) considered binding sites as independent and did not consider any potential cooperativity (the Hill coefficient nH is equal to 1). The right column indicates the number of experiments.


Ligand

Cooperative Binding Site Analysis

Independent Binding Site Analysis (n = 1)

No. of Experiments
Kd
Hill Coefficient
Kd
nM nM
25I-HO-LVA 0.031 ± 0.005 0.94 ± 0.06 0.028 ± 0.004 5
[3H]AVP 70 ± 35 0.52 ± 0.03 3.8 ± 2 3
25I-OTA
0.35 ± 0.13
1.20 ± 0.035
0.58 ± 0.18
7