The displacement curves of the effect of picrotoxin on the S35-tert-butyl bicyclophosphorothionate binding to the brain membranes of inbred mice C57Bl/6 and Balb/c were analysed. The marked interstrain differences between modifications of IC50 and nHill dependent on the ionic force of the incubation medium were revealed. After partial stimulation of the receptor in the presence of 50 mM concentration of NaCl, the susceptibility of the receptor to picrotoxin was higher in the membrane suspension of C57Bl/6 mice than of Balb/c. Full stimulation of the receptor by 200 mM concentration of NaCl resulted in disappearance of interstrain differences. The value of nHill of C57Bl/6 membrane receptors increased after the change of the concentration of NaCl in the incubation medium from 50 to 200 mM, while it was invariable to Balb/c mice. It was marked that modification of the parameters of the binding of the radioligand to the membranes of C57Bl/6 mice was more latent, than for Balb/c mice.
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