[Prolonged administration of antidepressants induces changes in the pulsed release but not in the reverse uptake of biogenic amines].
The experiments on rats have shown that antidepressant concentrations that cause 50% inhibition of 14C-NA and 3H-HT uptake by brain slices remain unchanged following prolonged administration of antidepressants (imipramine, pirazidole, harmane and its derivatives--C-153, C-307, C-394, C-395), as compared to the control. Electrical stimulation of brain slices upon long-term treatment of rats with antidepressants and preincubation with 14C-NA and 3H-HT enhanced presynaptic release of radioactive mark at concentrations of antidepressants (EC2) 3-14 times lower than those in the control animals. Long-term antidepressant administration reduces the inhibitory influence of clonidine and HT on presynaptic release of 14C-NA and 3H-HT by brain slices. It is suggested that long-term administration of antidepressants decreases the sensitivity of terminal axons of NA- and HT-ergic neurons to autoinhibitory effect of neurotransmitter release.
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AT
Dolzhenko
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IV
Komissarov
D000818:Animals; D000928:Antidepressive Agents / Q000008:administration & dosage / Q000494:pharmacology*; D001679:Biogenic Amines / Q000378:metabolism*; D001921:Brain / Q000378:metabolism* / Q000502:physiology; D009474:Neurons / Q000378:metabolism / Q000502:physiology; D009638:Norepinephrine / Q000378:metabolism; D051381:Rats; D012701:Serotonin / Q000378:metabolism; D013997:Time Factors
D000928:Antidepressive Agents; D001679:Biogenic Amines; D012701:Serotonin; D009638:Norepinephrine
Izmenenie pod vliianiem dlitel'nogo vvedeniia antidepressantov impul'snogo vysvobozhdeniia, no ne obratnogo zakhvata bioaminov.