Clomipramine increases firing rate in lateral septal neurons related with hippocampus.
Long-term clomipramine administration (CMI: 2.5 mg/kg IP, 25 days) effects on 274 identified hippocampus-septal neurons was assessed in rats. Stimulation of CA 1/dentate areas produced a biphasic response in 61% of lateral septal neurons. A brief activation was followed by a period of suppression of firing. In CMI-treated rats, the neurons showing this biphasic response increased their firing rate about fourfold, while the suppression of firing shortened around threefold. Other septal neurons (36%), in which only the burst of activation appeared but not suppression of firing, did not change their firing rate even after long-term CMI. In conclusion, CMI produces an increase of firing rate in lateral septal neurons receiving inhibitory hippocampal influence which is likely to be mediated by a disinhibitory process.
Departamento de Fisiología, UNAM, México.
M L
ML
Marván
C M
CM
Contreras
D000818:Animals; D002997:Clomipramine / Q000494:pharmacology*; D004558:Electric Stimulation; D005071:Evoked Potentials / Q000187:drug effects / Q000502:physiology; D006624:Hippocampus / Q000187:drug effects* / Q000502:physiology; D008297:Male; D009433:Neural Inhibition / Q000187:drug effects / Q000502:physiology; D009434:Neural Pathways / Q000187:drug effects / Q000502:physiology; D009474:Neurons / Q000187:drug effects / Q000502:physiology; D011903:Raphe Nuclei / Q000187:drug effects* / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar; D011985:Receptors, Serotonin / Q000187:drug effects* / Q000502:physiology; D012686:Septal Nuclei / Q000187:drug effects* / Q000502:physiology; D012701:Serotonin / Q000502:physiology*; D009435:Synaptic Transmission / Q000187:drug effects* / Q000502:physiology
D011985:Receptors, Serotonin; D012701:Serotonin; D002997:Clomipramine