Abstract：
:Nucleus raphe magnus contains a large population of raphe-spinal serotonergic neurons that are thought to be involved in descending control of pain transmission and the modulation of opioid analgesia. Intracellular recordings were made from nucleus raphe magnus neurons in the slice preparation. Cells were divided into two groups, primary and secondary cells, based on the action potential waveform and response to opioids, as reported previously. In some experiments, cells were filled with biocytin and 5-hydroxytryptamine-containing cells were identified immunohistochemically. Of the primary cells that were filled with biocytin, 93% stained for 5-hydroxytryptamine; 90% of biocytin-filled secondary cells were unlabeled for 5-hydroxytryptamine. Previous studies have shown that primary cells are disinhibited by opioids; the finding that most primary cells are serotonergic suggests that at least some 5-hydroxytryptamine-containing neurons in the nucleus raphe magnus are excited by opioid analgesics. 5-Hydroxytryptamine hyperpolarized cells in both primary and secondary cell groups. The 5-hydroxytryptamine agonists (+/-)-2-dipropylamino-8-hydroxy-1,2,3,4-tetrahydronaphthalene hydrobromide and 5-carboxamidotryptamine mimicked this action of 5-hydroxytryptamine, indicating that the 5-hydroxytryptamine 1A-subtype mediated this hyperpolarization. The hyperpolarization was mediated by an increase in potassium conductance that rectified inwardly. Local electrical stimulation of afferents evoked an inhibitory postsynaptic potential in primary cells. The inhibitory postsynaptic potential reversed polarity at the potassium equilibrium potential and was blocked by 5-hydroxytryptamine 1A receptor antagonists. It is proposed that the 5-hydroxytrypamine1A receptor on serotonergic primary cells may function as an autoreceptor to regulate the activity.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Pan ZZ,Wessendorf MW,Williams JTdoi
10.1016/0306-4522(93)90263-fsubject
Has Abstractpub_date
1993-05-01 00:00:00pages
421-9issue
2eissn
0306-4522issn
1873-7544pii
0306-4522(93)90263-Fjournal_volume
54pub_type
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