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- W1567992617 abstract "The present study examines the possible role of sodium channels in the behavioral effects of cocaine. Cocaine congeners are apparent competitive inhibitors of the scorpion toxin-enhanced binding of [3H]batrachotoxinin A 20-alpha-benzoate to sodium channels in mouse cerebrocortical synaptosomes. However, in agreement with the allosteric model for heterotropic cooperative interactions, the compounds produce a concentration-dependent increase in the rate of dissociation of binding. Concentrations that give a 2-fold increase of k-1 are close to Ki values for inhibiting equilibrium binding of [3H]bactrachotoxinin A 20-alpha-benzoate, suggesting that the inhibitory effect on binding results mostly from an increase of the apparent dissociation rate constant. The ester linkage between the tropane and benzoyl ring of cocaine is not essential for the inhibitory potency, and for both the C-2 and C-3 substituents the equatorial position results in a higher potency than the axial position. There is reasonable agreement between the rank order of potencies in blocking the sodium channel and in inhibiting locomotor behavior. The present results do not support a relationship between the capability of cocaine congeners in blocking sodium flux and in inhibiting uptake of dopamine into striatal synaptosomes. However, peak levels of cocaine in the brain of cocaine addicts could be high enough to interfere with sodium channel functioning, possibly contributing to some of cocaine's actions." @default.
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- W1567992617 date "1986-06-01" @default.
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- W1567992617 title "Structural requirements for cocaine congeners to interact with [3H]batrachotoxinin A 20-alpha-benzoate binding sites on sodium channels in mouse brain synaptosomes." @default.
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- W1567992617 doi "https://doi.org/10.1016/s0021-9258(17)38390-4" @default.
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