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Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Eur+J+Pharmacol 2011 ; 650 (1): 215-9 Nephropedia Template TP
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Clonidine inhibits itch-related response through stimulation of alpha(2)-adrenoceptors in the spinal cord in mice #MMPMID20951695
Gotoh Y; Andoh T; Kuraishi Y
Eur J Pharmacol 2011[Jan]; 650 (1): 215-9 PMID20951695show ga
The present study investigated whether clonidine - an alpha(2)-adrenoceptor agonist known to relieve pain - is able to suppress itch-related behavior in mice. An intraplantar injection of serotonin induced biting (an itch-related response), which was inhibited by intraperitoneal and intrathecal, but not intraplantar or intracisternal, clonidine injections. The effect of intrathecal clonidine was inhibited by intrathecal injections of phentolamine (a non-selective alpha-adrenoceptor antagonist) and yohimbine (a selective alpha(2)-adrenoceptor antagonist), but not by prazosin (a selective alpha(1)-adrenoceptor antagonist). The effect of intraperitoneal clonidine was also inhibited by intrathecal yohimbine. These results suggest that clonidine is an effective antipruritic agent and that the effect is mainly mediated by the stimulation of alpha(2)-adrenoceptors in the dorsal horn.