Abstract:
:In isolated guinea pig bronchi, the influence of ruthenium red, capsazepine and extracellular Ca2+ on capsaicin-induced desensitization was examined to investigate whether this desensitization was mediated via a specific receptor coupled with an ion channel. Pre-exposure of tissues to capsaicin (1, 3 or 10 microM) caused a dose-dependent desensitization to the second application of capsaicin. However, the contractile responses to exogenous tachykinins were not changed after pre-exposure of tissues to capsaicin. This capsaicin-induced desensitization was prevented by capsazepine (30 microM), but not by ruthenium red added to tissues 20 min before pretreatment with capsaicin (3 microM). While the excitatory contractile response to capsaicin was markedly reduced in the absence of extracellular Ca2+, the desensitization induced by capsaicin was not changed by the removal of extracellular Ca2+. In summary, the results from the present study suggest that in vitro functional desensitization induced by capsaicin in guinea pig bronchi may involve changes in the vanilloid receptor and occur through a ruthenium red-insensitive pathway.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Jung YS,Cho TS,Moon CH,Shin HSdoi
10.1016/s0014-2999(98)00786-9subject
Has Abstractpub_date
1998-12-04 00:00:00pages
193-8issue
2-3eissn
0014-2999issn
1879-0712pii
S0014-2999(98)00786-9journal_volume
362pub_type
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