Serotonin type II receptor activation facilitates synaptic plasticity via N-methyl-D-aspartate-mediated mechanism in the rat basolateral amygdala.
The modulation of synaptic plasticity by serotonin type II (5-hydroxytryptamine type II (5-HT(2)))-receptor stimulation was explored using intracellular, field potential and Fura-2 fluorescence image recordings in a rat amygdala slice preparation. Bath application of 5HT(2) receptor agonist 1-(2,5)-dimethoxy-4-iodophen-2-aminopropane (DOI) transformed theta-burst-stimulated (TBS) synaptic plasticity from short-term potentiation to long-term potentiation. DOI enhanced N-methyl-D-aspartate (NMDA) receptor-mediated potentials and calcium influx without affecting the resting membrane potential or input resistance of the neurons. In contrast, alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA)/kainate receptor-mediated excitatory synaptic responses were unaffected by DOI. The facilitating effects of DOI were blocked by the 5-HT(2) receptor antagonist, ketanserin, and by the 5-HT(2C)-receptor selective antagonist, RS102221. These results indicate that 5-HT(2)-receptor activation enhances NMDA receptor-mediated synaptic function in the basolateral amygdala (BLA).
Chen
A
A
Department of Psychiatry, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814-4799, USA.
Hough
C J
CJ
Li
H
H
D000679:Amygdala / Q000033:anatomy & histology / Q000187:drug effects* / Q000502:physiology; D000818:Animals; D002118:Calcium / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D004558:Electric Stimulation; D018690:Excitatory Amino Acid Agonists / Q000494:pharmacology*; D005456:Fluorescent Dyes / Q000378:metabolism; D016257:Fura-2 / Q000378:metabolism; D005998:Glycine / Q000494:pharmacology; D066298:In Vitro Techniques; D007215:Indophenol / Q000031:analogs & derivatives* / Q000494:pharmacology*; D007650:Ketanserin / Q000494:pharmacology; D008274:Magnesium / Q000494:pharmacology; D008297:Male; D008564:Membrane Potentials / Q000187:drug effects; D016202:N-Methylaspartate / Q000494:pharmacology*; D009473:Neuronal Plasticity / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012702:Serotonin Antagonists / Q000494:pharmacology; D017366:Serotonin Receptor Agonists / Q000494:pharmacology*; D013141:Spiro Compounds / Q000494:pharmacology; D013449:Sulfonamides / Q000494:pharmacology; D009435:Synaptic Transmission / Q000187:drug effects; D013997:Time Factors; D014633:Valine / Q000031:analogs & derivatives* / Q000494:pharmacology
C107821:8-(5-(5-amino-2,4-dimethoxyphenyl)-5-oxopentyl)-1,3,8-triazaspiro(4.5)decane-2,4-dione; D018690:Excitatory Amino Acid Agonists; D005456:Fluorescent Dyes; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists; D013141:Spiro Compounds; D013449:Sulfonamides; C113896:dimethoxy-4-indophenyl-2-aminopropane; D007215:Indophenol; D016202:N-Methylaspartate; C056639:2-amino-5-phosphopentanoic acid; D007650:Ketanserin; D014633:Valine; D008274:Magnesium; D002118:Calcium; D005998:Glycine; D016257:Fura-2