Abstract
The nonapeptide-receptor interaction energy calculated from docking algorithms was compared with the effect of the same peptides upon solute-free water reabsorption in rat kidney in vivo. Vasotocin and some of its analogs were injected intramuscularly into conscious female Wistar rats in doses from 0.1 pmol to 0.5 nmol/kg of body weight after oral water load (50 ml/kg of body weight). A significant correlation was found between the calculated energy of peptide interaction with V2 receptors and an increase in the renal solute-free water reabsorption stimulated by injection of nonapeptides. The results evidence that physiological changes in rat kidney in vivo induced by vasotocin analogs can be accurately simulated by virtual modeling of their interactions with V2 receptors.
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