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°¡Åä¿¡¼­ Ãø³ú½Ç³» 4-AminopyridineÀÇ Ç÷¾Ð¿¡ ´ëÇÑ »ó½ÂÈ¿°ú Pressor Effect of Intracerebroventricular 4-Aminopyridine on the Systemic Arterial Pressure in the Rabbit

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ÀÓÁؼ·/Jun Seob Lim °­¼±¿µ/¹é¿µÈ«/°­»ï¼®/°­¼±¿µ/¹é¿µÈ«/°­»ï¼®/Seon Young Kang/Yung Hong Baik/Sam Suk Kang/Seon Young Kang/Yung Hong Baik/Sam Suk Kang

Abstract

°á·Ð
4-APÀ» Ãø³ú½Ç³»·Î Åõ¿©Çϸé Ç÷¾Ð¿¡ ´ëÇÑ ¿ë·®ÀÇÁ¸¼º ½Â¾ÐÈ¿°ú°¡ ³ªÅ¸³µÀ¸³ª °°Àº ·®À»
Á¤¸Æ³»·Î Åõ¿©ÇÏ¸é ¶Ñ·ÇÇÑ Ç÷¾Ðº¯µ¿ÀÌ °üÂûµÇÁö ¾Ê¾Ò´Ù. ±¸Á¶°¡ ´Ù¸¥ K+ Åë
·Î Â÷´ÜÁ¦ÀÎ tetraethylammoniumÀÇ Ãø³ú½Ç³» Åõ¿©´Â ¶Ñ·ÇÇÑ Ç÷¾Ð º¯µ¿À» ÀÏÀ¸Å°Áö ¸øÇÏ¿´
´Ù. Phenoxybenzamine°ú chlorisondamineÀÇ Á¤¸Æ³» Åõ¿© ÈÄ Ãø³ú½Ç³» 4-APÀÇ ½Â¾Ð È¿°ú´Â
¿µÇâÀ» ¹ÞÁö ¾Ê¾Ò°í, phentolamine°ú prazocinÀÇ Ãø³ú½Ç³» ó¸®ÇÏ¿¡¼­µµ 4-APÀÇ ½Â¾ÐÈ¿°ú´Â
¾ïÁ¦µÇÁö ¾Ê¾Ò´Ù. ±×·¯³ª Ãø³ú½Ç³» yohimbine Åõ¿©ÈÄ¿¡´Â Ãø³ú½Ç³» 4-APÀÇ ½Â¾ÐÈ¿°ú°¡ Çö
ÀúÇÏ°Ô ¾ïÁ¦µÇ¾úÀ¸¸ç Ãø³ú½Ç³» clonidine ó¸®ÇÏ¿¡¼­´Â 4-APÀÇ ½Â¾ÐÈ¿°ú´Â À¯ÀÇÇÏ°Ô Áõ°­µÇ
¾î ³ªÅ¸³µ´Ù. Ca2+ Åë·Î Â÷´ÜÁ¦ÀÎ diltiazemÀÇ Ãø³ú½Ç³» Åõ¿©ÈÄ¿¡´Â Ãø³ú½Ç³»
4-APÀÇ ½Â¾ÐÈ¿°ú°¡ À¯ÀÇÇÏ°Ô ¾ïÁ¦µÇ¾ú´Ù. ¾çÃø ºÎ½ÅÀ» Á¦°ÅÇϸé Ç÷¾ÐÀº ÇöÀúÇÏ°Ô °¨¼ÒµÇ¾ú
°í À̶§µµ Ãø³ú½Ç³» 4-APÀÇ ½Â¾ÐÈ¿°ú´Â °ÅÀÇ ¿µÇâÀ» ¹ÞÁö ¾Ê°í ±×´ë·Î ³ªÅ¸³µ´Ù. ÀÌ»óÀÇ
¼ºÀûÀº °¡Åä ³ú³»¿¡ Ç÷¾ÐÁ¶Àý¿¡ °ü¿©ÇÏ´Â 4-AP-sensitive K+Åë·Î°¡ Á¸ÀçÇϸç
ÀÌ K'Åë·Î´Â ±³°¨½Å°æ°è ±â´É°ú ¹«°üÇÏ°í ÁßÃß ¥á2-adrenoceptor¿Í °ü°è°¡
ÀÖÀ½À» ½Ã»çÇÑ´Ù.
#ÃÊ·Ï#
A K+-channel blocker, 4-aminopyridine(4-AP) increases neurotransmitter
release from motor nerve terminals and has been shown to restore neurotranmission in
the myasthenic syndrome. It has been reported that the intravenous injection of 40AP in
the myasthenic patients caused many central adverse effects including anxiety and
restlessness. but did not affect the blood pressure.
The aim of this study was to observe the effect of intracerebroventricularly
administered 4-AP on the blood pressure and to elucidate the mechanism of the action
in urethane-anesthetized rabbits.
Intracerebroventricular(icv) 4-AP produced pressor effects in a dose-dependent fashion.
but intravenous(iv) 4-AP of the same dose did not altered the blood pressure.
Tetraethylammonium. a K+-channel blocker whish differs from 4-AP
structurally. had little effect on the blood pressure. but 3.4-diaminopyridine. another
derivative of the aminopyridine. produced pressor effect similar to 4-AP. The pressor
effect of icv 4-AP was not affected by the treatment with iv phenoxybenzamine and
chlorisondamine. and in bilateral adrenalectiomized rabbits. These results suggest that
the 4-AP pressor effect is not related to the periphral sympathetic nerve nor adrenal
gland.
The pretreatment with icv phentolamine and prazosine did not altered the 40AP
pressor. However. the icv 4-AP pressor effect was significantly attenuated by the
treatment with icv diltiaxem markedly inhibited the icv 40Ap pressor effect.
It is concluded that 4-AP-sensitive K+-channel in rabbit brain might
play a role in the regulation of blood pressure and that the 4-AP pressor effect is
closely related to the central ¥á2-adrenoceptors and L-type calcium
channels.

K+-channel blocker; 4-aminopyridine; Urethane-anesthetized rabbit; intracerebroventricular; Pressor effect; ¥á2-adrenoceptors.;

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