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ÈòÁã ÃéÀå ¼±Æ÷¿¡¼­ Somatostatin¿¡ ÀÇÇÑ Amylase À¯¸® ¾ïÁ¦½Ã ¼¼Æ÷³» Ca2+ÀÇ ¿ªÇÒ The Role of Intracellular [Ca2+]i in Inhibiting Somatostatin-Induced Pancreatic Amylase Release

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Abstract

¿ä¾à
¸ñÀû : ºÐ¸®ÇÑ ÃéÀå ¼±Æ÷¿¡¼­ ÇÕ¼º SS À¯»çüÀÎ ocreotide¸¦ »ç¿ëÇÏ¿© ¼¼Æ÷³» calcium °æ
·Î¿¡ ´ëÇÑ SSÀÇ È¿°ú¸¦ °üÂûÇÏ¿´´Ù. ÀÌ ½ÇÇèÀ» ½ÇÇàÇϴµ¥ À־ Åõ°ú¼º ¼±Æ÷¸¦ »ç¿ëÇÏ¿´
°í [Ca2+]i¸¦ ÃøÁ¤ÇÏ¿´´Ù.
´ë»ó ¹× ¹æ¹ý : ¼öÄÆ ÈòÁãÀÇ ÃéÀåÀ» ÀûÃâÇÑ ÈÄ collagenase°¡ ÇÔÀ¯µÈ ¿ë¾×À¸·Î ó¸®ÇÏ¿© Ãé
Àå ¼±Æ÷¸¦ ¾ò¾ú°í À¯¸®µÈ amylase È°¼ºÀ» ÃøÁ¤ÇÏ¿´´Ù. ÃéÀå¼±Æ÷´Â ÀÏÁ¤ÇÑ ¼±ÅÃÀû
[Ca2+]i¸¦ À¯ÁöÇϱâ À§Çؼ­ streptolysin O¸¦ »ç¿ëÇÏ¿© Åõ°ú½ÃÄ×´Ù.
[Ca2+]i´Â fura-2/AMÀ» »ç¿ëÇÏ¿© °áÁ¤Çß´Ù.
°á°ú : SLO¿¡ ÀÇÇÑ Åõ°ú¼º ¼±Æ÷¿¡¼­ CCK-8Àº ³ôÀº [Ca2+]i¿¡µµ ºÒ±¸ÇÏ°í
amylase À¯¸®¸¦ À¯ÀÇÇÏ°Ô Áõ°¡½ÃÄ×´Ù. Octreotide¸¦ ÇÔ²² Åõ¿©ÇßÀ» ¶§, Áõ°¡µÈ amylase À¯
¸®´Â À¯ÀÇÇÑ ¼öÁØÀ¸·Î °¨¼ÒÇÏ¿´´Ù. ºÐ¸®ÇÑ Á¤»ó ÃéÀå ¼±Æ÷¿¡¼­ CCK-8, carbachol ±×¸®°í
secretinÀº amylase À¯¸®¸¦ À¯ÀÇÇÏ°Ô Áõ°¡½ÃÄ×´Ù. ±×¸®°í Áõ°¡µÈ amylase À¯¸®´Â octreotide
¿¡ ÀÇÇؼ­ ¾ïÁ¦µÇ¾ú´Ù. CCK-8°ú carbacholÀº ºÎ¼öÀûÀ¸·Î [Ca2+]i¸¦ À¯ÀÇÇÏ°Ô
Áõ°¡½ÃÄ×´Ù. ±×·¯³ª, octreotide ´Üµ¶ óġ·Î´Â ÃéÀå ¼±Æ÷³»¿¡¼­ [Ca2+]iÀÇ º¯
È­¸¦ ÀÏÀ¸Å°Áö ¸øÇß´Ù. ±×¸®°í CCK-8°ú carbachol¿¡ ÀÇÇÑ [Ca2+]i Áõ°¡´Â
octreotide¿¡ ÀÇÇØ À¯ÀÇÇÏ°Ô Áõ°¡µÇ¾ú´Ù.
°á·Ð : À§ÀÇ °á°ú·Î º¸¾Æ, octreotide´Â ¼¼Æ÷³» [Ca2+]i°ú °ü·Ã ¾øÀÌ CCK¿¡
ÀÇÇÑ amylase À¯¸®¸¦ ¾ïÁ¦½ÃÅ°´Â °ÍÀ¸·Î º¸À̸ç octreotide¿¡ ¹ÝÀÀÇÑ [Ca2+]i
ÀÇ Áõ°¡´Â octreotide¿¡ ÀÇÇÑ ÃéÀå amylase À¯¸® ¾ïÁ¦¿¡ Á÷Á¢ÀûÀ¸·Î °ü·ÃµÇ¾î ÀÖÁö ¾Ê´Â °Í
°°´Ù.
#ÃÊ·Ï#
Background/Aims : We previously found that somotostatin (SS) inhibited amylase
release partly by inhibiting basal cellular cAMP formation in pancreatic acini. In the
present study, we verified the effect of SS on intracellular calcium pathway in
pancreatic acini isolated from rats, using a synthetic SS analogue, octreotide. For that
purpose, permeabilized acini were employed and intracellular calcium concentration
([Ca2+]i) was measured.
Methods : Dispersed pancreatic acini were isolated from rat pancreas and amylase
release was measured. Pancreatic acini were permeabilized using streptolysin O (SLO) to
maintain a constant optional [Ca2+]i. The [Ca2+]i was
determined using fura-2/AM.
Results : In SLO-permeabilized pancreatic acini, CCK-8 increased amylase release
despite high [Ca2+]i. The increased amylase release was significantly
inhibited by octreotide. In normal dispersed acini, amylase release stimulated by CCK-8
and carbachol was inhibited by octreotide. CCK-8 and carbachol significantly increased
[Ca2+]i. However, Octreotide alone did not have any effect on
[Ca2+]i. Increases in the [Ca2+]i induced by CCK-8 and
carbachol were augmented by octreotide.
Conclusions : From the above result, it is concluded that octreotide inhibits
CCK-induced amylase release irrespective of intracellular calcium, and increased
[Ca2+]i in response to octreotide is not related directly to inhibition of
pancreatic amylase release.

Å°¿öµå

ÃéÀå ¼±Æ÷; Somatostatin; ¼¼Æ÷³» calcium; Pancreatic acini; Somatostatin; Intracellular calcium;

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