Effects of capsaicin on IA and IK in cultured trigeminal ganglion neurons of rat / 药学学报
Acta Pharmaceutica Sinica
;
(12): 975-979, 2004.
Artigo
em Chinês
| WPRIM
| ID: wpr-241379
ABSTRACT
<p><b>AIM</b>To investigate the effect of capsaicin on IA and IK in cultured rat trigeminal ganglion (TG) neurons.</p><p><b>METHODS</b>Whole-cell patch clamp technique was used to record the IA and IK before and after capsaicin perfusion at different concentrations.</p><p><b>RESULTS</b>In capsaicin-sensitive (CS) neurons, capsaicin was shown to selectively inhibit IA in dose-dependent manner, the IC50 was 0.99 micromol x L(-1). Yet capsaicin showed no inhibitory effect on IK, capsaicin (10 micromol x L(-1)) only slightly inhibited IK by 13.2%. In capsaicin-insensitive (CIS) neurons, capsaicin (1 micromol x L(-1)) showed no significant inhibitory effect on IA and IK, capsaicin (10 micromol x L(-1)) only slightly inhibited IA and IK by 16.8% and 15.3%, respectively. Neither 1 micromol x L(-1) nor 10 micromol x L(-1) capsaicin showed effect on the G-V curve of IA and IK.</p><p><b>CONCLUSION</b>Capsaicin was found to selectively inhibit the IA current in CS neurons, and this effect may contribute to hyperalgesia when capsaicin was first used.</p>
Texto completo:
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Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Farmacologia
/
Fisiologia
/
Capsaicina
/
Células Cultivadas
/
Gânglio Trigeminal
/
Ratos Sprague-Dawley
/
Técnicas de Patch-Clamp
/
Biologia Celular
/
Canais de Potássio de Abertura Dependente da Tensão da Membrana
/
Neurônios
Limite:
Animais
Idioma:
Chinês
Revista:
Acta Pharmaceutica Sinica
Ano de publicação:
2004
Tipo de documento:
Artigo
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