Inhibition by tramadol of muscarinic receptor-induced responses in cultured adrenal medullary cells and in Xenopus laevis oocytes expressing cloned M1 receptors.
Inhibition by tramadol of muscarinic receptor-induced responses in cultured adrenal medullary cells and in Xenopus laevis oocytes expressing cloned M1 receptors.
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曲马多抑制培养的肾上腺髓质细胞和表达克隆 M1 受体的非洲爪蟾卵母细胞中毒蕈碱受体诱导的反应。
DOI:
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发表时间:
2001
影响因子:
3.5
通讯作者:
A. Shigematsu
中科院分区:
文献类型:
--
作者:
M. Shiraishi;K. Minami;Y. Uezono;N. Yanagihara;A. Shigematsu
Tramadol is a widely used, centrally acting analgesic, but its mechanisms of action are not completely understood. Muscarinic receptors are known to be involved in neuronal function in the brain and autonomic nervous system, and much attention has been paid to these receptors as targets of analgesic drugs in the central nervous system. This study investigated the effects of tramadol on muscarinic receptors by using two different systems, i.e., a Xenopus laevis oocyte expression system and cultured bovine adrenal medullary cells. Tramadol (10 nM-100 microM) inhibited acetylcholine-induced currents in oocytes expressing the M1 receptor. Although GF109203X, a protein kinase C inhibitor, increased the basal current, it had little effect on the inhibition of acetylcholine-induced currents by tramadol. On the other hand, tramadol did not inhibit the current induced by AlF4-, a direct activator of GTP-binding protein. In cultured bovine adrenal medullary cells, tramadol (100 nM-100 microM) suppressed muscarine-induced cyclic GMP accumulation. Moreover, tramadol inhibited the specific binding of [3H]quinuclidinyl benzilate (QNB). Scatchard analysis showed that tramadol increases the apparent dissociation constant (Kd) value without changing the maximal binding (Bmax), indicating competitive inhibition. These findings suggest that tramadol at clinically relevant concentrations inhibits muscarinic receptor function via QNB-binding sites. This may explain the neuronal function and anticholinergic effect of tramadol.
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影响因子:
5
作者:
Fernando,JC;Abdallah,EA;Evinger,M;Forray,C;el-Fakahany,EE
通讯作者:
el-Fakahany,EE
影响因子:
3.6
作者:
Sanna,E;Dildy-Mayfield,JE;Harris,RA
通讯作者:
Harris,RA
DOI:
--
发表时间:
1997
期刊:
The Journal of pharmacology and experimental therapeutics.
影响因子:
--
作者:
Minami,K;Minami,M;Harris,RA
通讯作者:
Harris,RA
影响因子:
3.6
作者:
F. Dörje;A. Levey;M. Brann
通讯作者:
F. Dörje;A. Levey;M. Brann
影响因子:
5
作者:
Minami,K;Vanderah,TW;Minami,M;Harris,RA
通讯作者:
Harris,RA