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BAPTA-AMÀÌ ³úÇãÇ÷¼Õ»ó¿¡ ¹ÌÄ¡´Â ½Å°æ¹æ¾îÀûÈ¿°ú Neuroprotective Effects of BAPTA-AM : A Dose-response Study and Estimation of Therapeutic Window

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Abstract

°á ·Ð
ÁßÃ߽Űæ°èÀÇ Á¶Á÷Àú»ê¼ÒÁõ¿¡ ´ëÇÑ ¼¼Æ÷Åõ°ú¼º Ä®½·ÀÌ¿Â ÈíÂøÁ¦ BAPTA-AM(1,2-bis-(2
-aminophenoxy)ethrnane-N, N, N', N'-tetraacetic acid acethoxymethyl ester)ÀÇ ½Å°æ¹æ¾î
Àû È¿°ú¸¦ ¿¬±¸Çϱâ À§ÇÏ¿© ÈòÁã ³úÀÇ Çظ¶¸¦ ÀÌ¿ëÇÏ¿© in vitro¿¡¼­ º» ½ÇÇèÀ» °èȹÇÏ¿´´Ù
pH7.4 Àΰø³úô¼ö¾×¿¡ 95% Áú¼Ò¿Í 5% ÀÌ»êȭź¼Ò¸¦ 20ºÐ°£ Åë±âÇÏ¿© Çظ¶Á¶Á÷¿¡ Àú»ê¼ÒÁõ
À» À¯¹ß½ÃÄ×´Ù. Àú»ê¼ÒÁõÀ¸·ÎºÎÅÍÀÇ È¸º¹ÀÇ Á¤µµ´Â Çظ¶ÀÇ CAIºÎºÐ¿¡¼­ Àü±â»ý¸®ÇÐÀûÀ¸·Î
ÃøÁ¤ÇÑ population spikeÀÇ È¸º¹À²À» »êÃâÇÏ¿´´Ù.
Ç¥Áسúô¼ö¾×¿¡¼­ Çظ¶Á¶Á÷Æí¿¡ Àú»ê¼ÒÁõÀ» À¯¹ßÇÑ ÈÄ population spike°¡ ȸº¹µÇ´Â Á¤µµ
´Â Àú»ê¼ÒÁõ ÀÌÀüÀÇ population spikeÀÇ ÁøÆø¿¡ ºñÇÏ¿© ¾à 70%Á¤µµ¿´´Ù.
Á¶Á÷Æí¿¡ Àú»ê¼ÒÁõÀ» À¯¹ßÇϸ鼭 1¥ìM BAPTA-AMÀ» Àΰø³úô¼ö¾×¿¡ ÷°¡ óġÇÑ °æ
¿ì, ±× óġ ½Ã°£º°¿¡ µû¸£´Â population spikeÀÇ È¸º¹Àº °¢°¢ÀÇ ½ÇÇ豺¿¡¼­ ¸ðµÎ ´ëÁ¶±º°ú
ÀÇÀÇ ÀÖ´Â Â÷À̸¦ ³ªÅ¸³»ÁÖÁö ¾Ê¾Ò´Ù.
Á¶Á÷Æí¿¡ Àú»ê¼ÒÁõÀ» À¯¹ßÇϸ鼭 10¥ìM BAPTA-AMÀ» Àΰø³úô¼ö¾×¿¡ ÷°¡ óġÇÑ °æ
¿ì Àú»ê¼ÒÁõÀ» À¯¹ßÇϱâ Àü¿¡ ¹Ì¸® BAPTA-AMÀ» óġÇÑ Àüóġ±º¿¡¼­ ±× óġ½Ã°£¿¡ µû
¸£´Â population spikeÀÇ È¸º¹ÀÇ Ç×ÁøÀÌ °üÂûµÇ¾ú´Ù. ±×¸®°í Àú»ê¼ÒÁõÀÇ À¯¹ß°ú µ¿½Ã¿¡ ¶Ç´Â
Àú»ê¼ÒÁõ À¯¹ß ÀÌÈÄ¿¡ BAPTA-AMÀ» óġÇÑ ±º¿¡¼­´Â population spikeÀÇ È¸º¹ÀÇ Ç×ÁøÀÌ
¾ø¾ú´Ù.
Á¶Á÷Æí¿¡ Àú»ê¼ÒÁõÀ» À¯¹ßÇϸ鼭 50¥ìM BAFTA-AMÀ» Àΰø³úô¼ö¾×¿¡ ÷°¡ óġÇÑ °æ
¿ì, population spikeÀÇ È¸º¹ÀÇ Ç×ÁøÀº ³ªÅ¸³ªÁö ¾Ê¾Ò´Ù.
Áï BAPTA-AMÀ» °¢°¢ÀÇ ³óµµ¿¡ µû¶ó Àú»ê¼ÒÁõÀÇ À¯¹ßÀÌ Àü¿¡ ÀüóġÇÑ °æ¿ì 10¥ìM
BAPTA-AM óġ±º¿¡¼­ °¡Àå ¶Ñ·ÇÇÑ population spike ȸº¹ÀÇ Ç×ÁøÀ» ³ªÅ¸³»ÁÖ¾ú´Ù.
BAPTA-AMÀÇ °¢°¢ÀÇ ³óµµ¿¡ µû¸£´Â ¿ë·®¹ÝÀÀ°î¼±(dose-response curve)Àº ¿ª UÇü
(inverted U-shape)À̸ç 10¥ìM³óµµ¿¡¼­ Á¤Á¡À» ÀÌ·ç¾ú´Ù.
#ÃÊ·Ï#
In central neurons, and excessive or sustained rise in the concentration of free
cytoplasmic Ca2+ ions([Ca2+]i) after hypoxia
may promote rapid neurodegeneration both in vitro and in vivo. Treating cells with
Ca2+ chelating agents may prevent or delay a loss of cellular
Ca2+ hemeiostasis after hypoxic injury and thus constitute an effective
strategy for minimizing neuronal damage. Cell-permanent Ca2+ chelators
such as 1,2-bis-(2-aminophenoxy)ethrane -N, N, N', N' - tetraacetic acid acetoxymethyl
ester(BAPTA-AM) have shown evidence of neuroprotective effect against hypoxic
neuronal injury. This study was designed to examine dose response and to estimate
therapeutic window of hippocampal slices which were superfused with artificial
cerebrospinal fluid(ASCF) in tissue chamber. Hypoxia was induced by replacement of
95% N2£«5% CO2 from 95% O2£«5%
CO2 for 20min. Recovery from hypoxic injury was evaluated by using a
percentage recovery of population spike, BATPA-AM in concentration of 1, 10 and 50
¥ìM were administered to the artificial cerebrospinal were divided to seven groups and
each group and each group was compared to control after hypoxia. The experimental
specimens were divided to seven groups and each group was compared to control ASCF
group. Recovery of population spike after hypoxia was about 70% incontrol ASCF-group,
which was mild type hypoxic injury. BAPTA-AM in 10¥ìM concentration, when given
just prior to hypoxia, enhanced recovery of population spikes at 15 and 30 min following
reoxygenation(p<0.05), in comparison with control ASCF. BATPA-AM had no
neuroprotective activity when given after the onset of hypoxia. Also, BATPA-AM in 1
and 50¥ìM concentration did not accentuate recovery of population spike after hypoxia.
Dose response curve was inverted U-shape and the response was maximum in 10¥ìM
concentration of BAPTA-AM.

Å°¿öµå

BAPTA-AM; Calcium chelator; Hypoxic injury; Population spike.;

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