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¹æ»ç¼±Á¶»ç¿¡ ÀÇÇØ ¹ß»ýµÇ´Â ¼¼Æ÷°í»ç¿¡ ´ëÇÑ CysteamineÀÇ È¿°ú THE Effects of Cysteamine on the Radiation-Induced Apoptosis

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ÃÖ¿µ¹Î/Young Min Choi ¹Úâ±³/Á¶Èï·¡/ÀÌÇü½Ä/Çã¿øÁÖ/Chang Gyo Park/Heung Lae Cho/Hyung Sik Lee/Won Joo Hur

Abstract

¸ñ Àû : ¹æ»ç¼±¿¡ ÀÇÇÑ ¼¼Æ÷°í»çÀÇ °æ·Î¿Í ¹æ»ç¼±º¸È£Á¦ÀÇ ÀÏÁ¾ÀÎ cysteamine (¥â-mecraptoethylamine)ÀÌ ¹æ»ç¼±¿¡ ÀÇÇÑ ¼¼Æ÷°í»ç¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸°íÀÚ ÇÏ¿´´Ù.
´ë»ó ¹× ¹æ¹ý : HL-60 ¼¼Æ÷ÁÖ¸¦ ´ë»óÀ¸·Î ´ëÁ¶±º, ¹æ»ç¼±Á¶»ç±º, cysteamine Àüóġ±º(1 mM, 10mM) À¸·Î ³ª´©¾î¼­ ½ÇÇèÀ» ÇÏ¿´´Ù. ¹æ»ç¼±Àº 6 MV·Î 10 Gy ÀÏȸ Á¶»çÇÏ¿´°í, cysteamineÀº ¹æ»ç¼±Á¶»ç 1½Ã°£ Àü¿¡ óġÇÏ¿´´Ù. ¼¼Æ÷°í»çÀÇ °æ·Î¸¦ ¾Ë¾Æº¸±â À§ÇÏ¿©
´ëÁ¶±º°ú
¹æ»ç¼±Á¶»ç±º¿¡¼­ caspase-8ÀÇ È°¼ºµµ¸¦ ÃøÁ¤ÇÏ¿´°í, ¼¼Æ÷°í»ç¿¡ ´ëÇÑ cysteamineÀÇ ¿µÇâÀ» ¾Ë¾Æº¸±â À§ÇÏ¿© ¹æ»ç¼±Á¶»ç ÈÄ 1.5,3,6,24½Ã°£¿¡¼­ °¢ ½ÇÇ豺ÀÇ »ýÁ¸ ¼¼Æ÷ ¼ö, caspase-3ÀÇ ¹ßÇö°ú È°¼ºµµ, poly(ADP-ribose) polymerase (PARP)ÀÇ ¹ßÇö µîÀ» ÃøÁ¤ÇÏ¿©
ºñ±³ÇÏ¿´´Ù.
°á °ú : ¼¼Æ÷»ç¸Á¼ö¿ëü¿¡ ÀÇÇÑ ¼¼Æ÷°í»çÀÇ ¹ß»ý°ú °ü·ÃÀÌ ÀÖ´Â caspase-8ÀÇ È°¼ºµµ´Â ¹æ»ç¼±Á¶»ç¿¡ ¿µÇâÀ» ¹ÞÁö ¾Ê¾Ò´Ù(P>0.05). »ýÁ¸ ¼¼Æ÷ ¼ö ´Â ¹æ»ç¼±Á¶»ç 6½Ã°£ ÈĺÎÅÍ °¨¼ÒµÇ¾ú´Âµ¥(p>0.05), 1mM cysteamine Àüóġ±º¿¡¼­´Â °¨¼ÒµÇÁö ¾Ê°í ´ëÁ¶±º°ú ºñ½ÁÇÏ°Ô
À¯ÁöµÇ¾ú´Ù. ¼¼Æ÷°í»çÀÇ ½ÇÇà ´Ü°è¶ó°í ¾Ë·ÁÁø caspase-3ÀÇ ¹ßÇöÀº °¢ ½ÇÇ豺µé »çÀÌ¿¡ Â÷ÀÌ°¡ ¾ø¾úÀ¸³ª, È°¼ºµµ´Â ¹æ»ç¼±Á¶»ç ÈÄ¿¡ Áõ°¡µÇ¾ú°í(p>0.05) 1mM cysteamine Àüóġ¿¡ ÀÇÇØ Áõ°¡°¡ °¨¼ÒµÇ´Â °æÇâÀ̾ú´Ù. Caspase-3ÀÇ È°¼º¿¡ ÀÇÇØ ¹ß»ýµÇ´Â PARP
ºÐÇػ깰(24
kD)ÀÇ ¹ßÇöÀÌ ¹æ»ç¼±Á¶»ç ÈÄ¿¡ °üÂûµÇ¾ú´Âµ¥, 1mM cysteamine Àüóġ±º¿¡¼­´Â ¹ßÇöÀÇ °¨¼Ò°¡ °üÂûµÇ¾ú´Ù.
°á ·Ð : ¹æ»ç¼±¿¡ ÀÇÇÑ ¼¼Æ÷°í»ç´Â ¼¼Æ÷»ç¸Á¼ö¿ëü ÀÇÇÑ ¼¼Æ÷°í»ç¿Í´Â ´Ù¸¥ °æ·Î¸¦ °ÅÄ¡°í, 1 mM cysteamine Àüóġ´Â ¹æ»ç¼±Á¶»ç¿¡ ÀÇÇÑ ¼¼Æ÷°í»çÀÇ ¹ß»ýÀ» ¾ïÁ¦ÇÏ´Â °æÇâÀÌ ÀÖ´Â °ÍÀ¸·Î »ý°¢µÈ´Ù.

Purpose : To investigate the pathways of radiation induced apoptosis and the effect of cysteamine (¥â-mercaptoethylamine), as a radioprotector, on it.
Materials and Methods : HL-60 cells were assigned to control, irradiated, and cysteamine (1 mM, 10mM) pretreated groups, Irradiation was given in a single fraction of 10 Gy (6 MV x-ray) and cysteamine was administered 1 hour before irradiation.
The
activities of caspase-8 were measured in control and irradiated group to evaluate its relation to the radiation induced apoptosis. To evaluate the role of cysteamine in radiation induced apoptosis, the number of viable cells, the expression and
activity
of caspase-3, and the expression of poly (ADP-ribose) polymerase (PARP) were measured and compared after irradiation the HL-60 cells with cysteamine pretreatment or not.
Result : The intracellular caspase-8 activity, known to be related to the death receptor induced apoptosis, was not affected by irradiation(p>0.05). The number of viable cells began to decrease from 6 hours after irradiation (p>0.05), but the
number of
viable cells in 1 mM cysteamine pretreated group was not decreased afger irradiation and was similar to those in the control group. In caspase-3 analyses, known as apoptosis executioner, its expression was not different but its activity was
increased by
irradiation(p>0.05). However, this increase of activity was suppressed by the pretreatment of 1mM crysteamine. The cleavage of PARP, thought to be resulted from caspase-3 activation, occurred after irradiation, which was attenuated by the
pretreatment
of 1mM cysteamine.
Conclusion : these results show that radiation induced apoptotic process is somewhat different from death receptor induced one and the pretreatment of 1 mM cysteamine has a tendency to decrease the radiation-induced apoptosis in HL-60 cells.

Å°¿öµå

¹æ»ç¼±; ¼¼Æ÷°í»ç; Cysteamine; Radiation; Apoptosis; Cysteamine;

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