Abstract:
:Rats were systemically pre-treated with capsaicin either on the first day of life or at an age of 1 month. Both treatments were found to deplete substance P levels in the trigeminal nucleus caudalis (55.6% and 57.9% depletions, respectively). Extracellular single neurone recordings in the trigeminal nucleus caudalis revealed that neither type of capsaicin treatment greatly altered the proportions of neurones responding to non-noxious or noxious mechanical stimulation of the face. However, the proportion of mechanically-nociceptive neurones also responding to noxious thermal stimulation was greatly reduced in neonatally-treated, but not adult-treated rats. As both methods of capsaicin treatment caused similar depletions of substance P, it is concluded that this peptide may not be the neurotransmitter of afferent fibres to the trigeminal nucleus caudalis signalling thermal nociception.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Salt TE,Crozier CS,Hill RGdoi
10.1016/0306-4522(82)91121-6subject
Has Abstractpub_date
1982-05-01 00:00:00pages
1141-8issue
5eissn
0306-4522issn
1873-7544pii
0306-4522(82)91121-6journal_volume
7pub_type
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