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°í¾çÀÌ À§ ÆòÈ°±Ù¿¡¼­ KCI¿¡ ÀÇÇÑ ±Ù¼öÃà¿¡ ´ëÇÑ Protein KinaseÀÇ Á¶Àý Regulation of Protein Kinase in KCI-induced Contraction of Cat Gastric Smooth Muscle

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Abstract

¿ä¾à
¸ñÀû : ÆòÈ°±Ù ¼öÃà¿¡ ´ëÇÑ ÀÛ¿ëÁ¦µéÀº phospholipase C¸¦ °ÅÃÄ protein kinase C ¶Ç´Â
receptor tyrosine kinase¸¦ È°¼ºÈ­½ÃÅ°´Â ½ÅÈ£Àü´Þ °úÁ¤À» °ÅÄ¡´Â °ÍÀ¸·Î ¾Ë·ÁÁ® ÀÖÀ¸³ª
KCI¿¡ ÀÇÇÑ ±Ù¼öÃàÀÇ ½ÅÈ£Àü´Þ °úÁ¤¿¡´Â ¾î¶°ÇÑ protein kinaseµéÀÌ È°¼ºÈ­µÇ´ÂÁö È®½ÇÄ¡
¾ÊÀº ½ÇÁ¤ÀÌ´Ù. ±×·¯¹Ç·Î ÀÌ ½ÇÇè¿¡¼­´Â °í¾çÀÌ À§ ÆòÈ°±Ù¿¡¼­ KCI¿¡ ÀÇÇÑ ±Ù¼öÃà¿¡ °ü¿©
ÇÏ´Â protein kinase¸¦ ±¸¸íÇÏ°íÀÚ ÇÏ¿´´Ù.
´ë»ó ¹× ¹æ¹ý : ¿©·¯ °¡ÁöÀÇ protein kinase, tyrosine kinase ¹× calmodulin ¾ïÁ¦Á¦µéÀÌ
KCI·Î À¯¹ß½ÃŲ ±Ù¼öÃà¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» °üÂûÇϱâ À§ÇÏ¿© Á¡¸·À» Á¦°ÅÇÑ À§(êÖ)ÀúºÎ·ÎºÎÅÍ
±ÙÀýÆíÀ» ¸¸µç ÈÄ force transducer¿Í polygraph¸¦ ÅëÇØ µîÀ强 ±Ù¼öÃà °î¼±À» ±â·ÏÇÏ¿´´Ù.
°á°ú : KCIÀº ³óµµ¿¡ ºñ·ÊÇÏ¿© ±Ù¼öÃàÀ» ÀÏÀ¸Ä×À¸¸ç, ÀÌ ¼öÃàÀº voltage-dependent
Ca2+ Åë·Î¸¦ ÅëÇÑ ¼¼Æ÷¿Ü Ca2+ ³óµµ¿¡ ÀÇÁ¸ÀûÀ̾ú´Ù. Protein
kinase C ¾ïÁ¦Á¦(H-7, bisindolylmaleimide)¿Í tyrosine kinase ¾ïÁ¦Á¦(genistein, methyl
2,5-dihydroxycinnamate)´Â ¸ðµÎ KCI¿¡ ÀÇÇÑ ±Ù¼öÃàÀ» À¯ÀÇÇÏ°Ô ¾ïÁ¦ÇÏ¿´À¸¸ç, À̵é
protein kinase ¾ïÁ¦Á¦µéÀ» µ¿½Ã¿¡ óġÇÏ¿´À» ¶§ °¢°¢À» ´Üµ¶À¸·Î óġÇÏ¿´À» ¶§º¸´Ù ´õ À¯
ÀÇÇÏ°Ô ¾ïÁ¦ÇÏ¿´´Ù. H-7, bisindolylmaleimide ¹× genisteinÀ» °¢°¢ verapamil°ú µ¿½Ã¿¡ Åõ¿©
Çϸé protein kinase ¾ïÁ¦Á¦¸¦ ´Üµ¶À¸·Î óġÇÏ¿´À» ¶§º¸´Ù À¯ÀÇÇÏ°Ô KCI¿¡ ÀÇÇÑ ±Ù¼öÃàÀÌ
´õ ¾ïÁ¦µÇ¾ú´Ù. Calmodulin ±æÇ×Á¦(W-7, trifluoperazine)´Â KCI¿¡ ÀÇÇÑ ±Ù¼öÃà¿¡ ÀÌ·¸´Ù ÇÒ
¿µÇâÀ» ÁÖÁö ¾Ê¾Ò´Ù.
°á·Ð : °í¾çÀÌ À§ ÆòÈ°±Ù¿¡¼­ KCI¿¡ ÀÇÇÑ ±Ù¼öÃà¿¡´Â protein kinase C¿Í tyrosine kinase
°¡ °ü¿©ÇÏ´Â °ÍÀ¸·Î »ç·áµÈ´Ù.
#ÃÊ·Ï#
Background/Aims : Smooth muscle contraction and relaxation are suggested to be
modulated by intracellular Ca2+, protein kinases and tyrosine kinases. To
investigate whether protein kineses are involved in the gastric smooth muscle
contraction induced by KCI, the effects of protein kinase inhibitors and tyrosine kinase
inhibitors on the contractions were observed in cat gastric muscle.
Methods : Circular muscle strips were obtained from the fundus of stomach. The
isometric contraction of the muscle strips were measured in isolated organ baths using
force transducers and polygraph.
Results : KCI caused a dose-dependent contraction of cat gastric smooth muscle,
which was dependent on the extracellular Ca2+ concentration and the
Ca2+ influx through voltage-dependent Ca2+channel. Both
protein kinase C and tyrosine kinase inhibitors significantly inhibited the KC1-induced
contraction. The combined inhibitory effect of two protein kinase inhibitors was greater
than that of each one. The combined effects of protein kinase inhibitors together with
verapamil were greater than that of each one. Calmodulin antagonists have no inhibitory
effect on KC1-induced contraction.
Conclusions : Protein kinase C and tyrosine kinase are suggested to be involved in
the contraction induced by KCI and these protein kinases play a role in the modulation
of voltage-dependent Ca2+ channel activity and Ca2+
sensitivity of contractile protein of the cat gastric smooth muscle.

Å°¿öµå

ÆòÈ°±Ù ¼öÃà; Calcium channel antagonists; Protein kinase C; Tyrosine kinase; Smooth muscle contraction; Calcium channel antagonists; Protein kinase C; Tyrosine kinase;

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