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Tetrahydroisoquinoline Alkaloids°¡ ÁãÀÇ µ¿¸Æ°ú ³ú±ÕµîÁúÀÇ ¥á-Adrenoceptors¿¡ ¹ÌÄ¡´Â ¿µÇâ Effect of Tetrahydroisoquinoline Alkaloids on the ¥á-adrenoceptors in Rat Aorta and Brain Homogenates

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ÀÌÇö¼®/Hyun Seok Lee ¹é¼±ÇÏ/Ȳ¼öÇö/¹ÚÀμº/±èÀº»ó/Á¤Áø¸í/ÇÑÁ¾¿ì/Àå±âö/Àå±âö/Sun Ha Paek/Soo Hyun Hwang/In Sung Park/Eun Sang Kim/Jin Myung Jung/Jong Woo Han/Ki Churl Chang/Ki Churl Chang

Abstract

Tetrahydroisoquinoline(THI) ¾ËÄ«·ÎÀ̵å È­ÇÕ¹°µéÀº °£´ÜÇÑ phenylethyamine È­ÇÕ¹°µéÀÇ
È£³ªÇü À¯µµÃ¼·Î »ý°¢ÇÒ ¼ö ÀÖ°í »ó´ç¼öÀÇ È­ÇÕ¹°µéÀÌ Åº¼Ò 6°ú 7¹ø À§Ä¡ÀÇ °ç°¡Áö ġȯ¸¸
À¸·Î catecholamines¿¡ ´ëÇÑ »ó´çÈ÷ ³ôÀº ģȭ·ÂÀ» º¸ÀÌ°í ÀÖ´Ù. º» ¿¬±¸¿¡¼­´Â ¸î °¡Áö
THI°è¿­ÀÇ È­ÇÕ¹°À» ÇÕ¼ºÇÏ°í ÈòÁãÀÇ ½É¹æ°ú ÈäºÎ ´ëµ¿¸ÆÀ» ÀûÃâÇÏ¿© ±× ¾à¸®ÇÐÀû ÀÛ¿ëÀ»
Á¶»çÇÏ¿´´Ù. ¶ÇÇÑ À̵é È­ÇÕ¹°ÀÇ ¥á1-¾Æµå·¹³¯¸° ¼ö¿ëü ģȭ·ÂÀ» Á¶»çÇϱâ
À§ÇØ ÈòÁã ´ë³ú¸¦ ±ÕÁúÈ­ÇÏ¿© [3H] prazosin ġȯ°áÇÕ½ÇÇèÀ» ÇÏ¿´´Ù.
ÀûÃâÇÑ ÈòÁ㠽ɹ濡¼­ ½ÃÇèÇÑ ¸ðµç THI°è È­ÇÕ¹°°ú dobutamineÀº ½É¹Ú¼ö¿Í ½É±Ù·ÂÀ» Áõ
°¡½ÃÄ×´Ù. Propranol Á¸ÀçÇÏ¿¡¼­´Â YS-49¿Í YS-51 È­ÇÕÀº ³óµµ-ÀÇÁ¸Àû ¹ÝÀÀ°î¼±Àº ¿À¸¥ÂÊ
À¸·Î À̵¿ÇÏ¿´°í pA2°ªÀÌ °¢°¢ 8.07¡¾0.84¿Í 7.93¡¾0.11À̾ú´Ù. °¢ È­ÇÕ¹°ÀÇ
±â¿ï±â´Â Å©°Ô ´Ù¸£Áö ¾Ê¾Æ À̵é È­ÇÕ¹°µéÀº ½ÉÀåÀÇ ¥â1-¾Æµå·¹³¯¸° ¼ö¿ëü
¿¡ ¸Å¿ì °æÀïÀûÀ¸·Î ÀÛ¿ëÇÔÀ» ¾Ë ¼ö°¡ ÀÖ¾ú´Ù. ÈòÁã ´ë³úÀÇ ¥á1-¾Æµå·¹³¯¸°
¼ö¿ëü¿¡ ´ëÇÑ YS-49, YS-51 ±×¸®°í higenamineÀÇ Ki°ªÀº °¢°¢ 2.75, 2.81 ±×¸®°í 1.02À̾ú
´Ù.
À̻󿡼­ THI ¾ËÄ«·ÎÀ̵å È­ÇÕ¹°µéÀº ÈòÁ㠽ɹæ°ú ´ëµ¿¸ÆÀÇ ¥á1-¾Æµå·¹³¯
¸° ¼ö¿ëü¿¡ »ó´çÇÑ Ä£È­·ÂÀ» °¡Áö´Â ÇÑÆí ½ÉÀåÀÇ ¥â1-¾Æµå·¹³¯¸° ¼ö¿ëü¿¡
µµ ´Ù¼Ò ³ôÀº ģȭ·ÂÀ» º¸¿´´Ù. ÀÌ¿¡ ÀúÀÚµéÀº ³ú µ¿¸Æ·ù¼º ÁöÁÖ¸·ÇÏ ÃâÇ÷½Ã, Ç÷°ü ¿¬ÃàÀ»
Ä¡·áÇϱâ À§ÇÑ À̵é È­ÇÕ¹°µéÀÇ À¯¿ë¼ºÀ» ¾Ë¾Æº¸´Â °ÍÀº °¡Ä¡°¡ ÀÖ´Ù°í º»´Ù.
#ÃÊ·Ï#
Tetrahydroisoquinoline(THI) alkaloids can be considered as cyclized derivatives of
simple phenylethylamines and many of them. especially with 6,7-disubstitution,
demonstrate relatively high affinity for catecholamines. In the present study,
pharmacological action of limited series THI has been examined using rat isolated atria
and aorta. [3H] prazosin displacement binding study with THI compounds
using rat brain homogenates was performed to find out if these probes to have ¥á
1-adrenoceptor affinity.
In isolated rat atria, all THIs and dobutamine increased heart rate and contractile
force. In the presence of propranolol, the concentration response curves of YS 49 and
YS 51 shifted to the right resulting in 8.07¡¾0.84 and 7.93¡¾0.11 of pA2
values, respectively. The slope of each compound was not deviated from unity,
indicating that these chemicals are highly competitive at the cardiac ¥â
1-adrenoceptors. YS 49, YS 51 and higenamine showed ¥á
1-adrenoceptor affinity in rat brain in which the dissociation constant(Ki)
was 2.75, 2.81 and 1.02¥ìM, respectively.
It is concluded, therefore, that THI alkaloids have considerable affinity to ¥á
1-adrenoceptors in rat aorta and atria, while these probes show relatively
high affinity for cardiac ¥â1-adrenoceptors. The authors speculate that it is
worthy investigating whether these chemicals are useful in the management of
vasospasm of aneurysmal subarachnoid hemorrhage.

Tetrahydroisoquinoline; Inotropic action; Vasodilatation; Rat; Adrenoceptor; Vasospasm; Subarachnoid hemorrhage;

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