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Effect of Small Dose of Radiation on Induction of Apoptosis in Murine Tumors
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1/2¼ºÁø½Ç/12Jinsil Seong
1/2ǥȫ·Ä/1/2Á¤ÀºÁö/1/2±è¼ºÈñ/1/2¼Ã¢¿Á/12Hong Ryull Pyo/12Eun Ji CHung/12Sung Hee Kim/12Chang Ok Suh
KMID : 0859319990170040307
Abstract
¸ñÀû : ¹æ»ç¼±¿¡ ÀÇÇÑ apoptosis À¯µµ¿¡ Àú¼±·® ¹æ»ç¼±¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» °üÂûÇÏ¿© adaptive
response Çö»óÀÌ °ü°èµÇ´ÂÁö¸¦ ¸¶¿ì½º Á¾¾ç¿¡¼ ºÐ¼®ÇÏ°í °ü·ÃµÇ´Â ±âÀü¿¡ °üÇÏ¿© ¿¬±¸ÇÏ°íÀÚ ÇÏ
¿´´Ù.
´ë»ó ¹× ¹æ¹ý : ¸¶¿ì½º µ¿Á¾¾ÏÀÎ HCa-l, OCa-l¿¡¼ Àú¼±·®(0.05 Gy) ¹æ»ç¼± Á¶»ç ÈÄ °í¼±·®(25
Gy)À» Á¶»çÇÏ¿© À̷κÎÅÍ ÀÏÁ¤½Ã°£ ÈÄ Á¾¾ç¿¡¼ À¯µµµÈ apoptosis ¼öÁØÀ» ºñ±³ ºÐ¼®ÇÏ¿´´Ù. ¶ÇÇÑ,
apoptosisÀÇ Á¶Àý ¹°ÁúÀÎ p53, Bcl-2, Bax, Bcl-X µîÀÇ ¹ßÇöÀ» Western blottingÀ¸·Î ºÐ¼®ÇÏ¿© °ü
·ÃµÈ ±âÀüÀ» ¿¬±¸ÇÏ¿´´Ù.
°á°ú : OCa-l¿¡¼ 0.05 Gy¸¦ Àü óġ ÈÄ¿¡ 25 Gy¸¦ Á¶»çÇÑ ±º¿¡¼ apoptosisÀÇ À¯µµ ¼öÁØÀº ¼¼
Æ÷ 1000°³´ç 229·Î¼ ¿¹»óµÇ´Â °ªÀÎ 324 ¿¡ ºñÇÏ¸é ¾à 30£¥Á¤µµ °¨¼ÒµÈ °á°ú·Î ³ªÅ¸³ª¼(p£¼0.05)
Àú¼±·®ÀÇ ¹æ»ç¼±¿¡ ÀÇÇÏ¿© apoptosisÀÇ À¯µµ ¼öÁØÀÌ °¨¼ÒÇÑ °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ¹Ý¸é HCa-l¿¡¼´Â
¿¹»óµÈ apoptosis¼öÁØ°ú ½ÇÁ¦ °üÂûÄ¡°£¿¡ º¯È°¡ ¾ø¾ú´Ù. À¯Àü¹°ÁúÀÇ ¹ßÇö¿¡¼ p53Àº µÎ Á¾¾ç °ø
È÷ 0.05 Gy Á¶»ç±º, 25 Gy Á¶»ç±º ¹× 0.05£«24 Gy Á¶»ç±º¿¡¼ ¹ßÇöÀÌ Áõ°¡µÇ¾ú´Ù. BcI-2¿Í Bax
´Â µÎ Á¾¾ç ¸ðµÎ ¹ßÇö ¼öÁØÀÇ µî¶ôÀÌ ÇöÀúÇÏÁö´Â ¾Ê¾ÒÀ¸³ª OCa-lÀÇ 0.05£«25 Gy Á¶»ç±º¿¡¼
Bcl-2ÀÇ ¹ßÇöÀÌ Bax¸¦ »óȸÇÏ´Â °á°ú¸¦ º¸¿´´Ù. Bcl-X´Â HCa-l¿¡¼ 0.05 Gy Á¤µµÀÇ Àú¼±·®¿¡¼
ºÎÅÍ ³ôÀº »ó½ÂÀ» º¸ÀÎ ¹Ý¸é, OCa-l¿¡¼´Â ÀüÇô ¹ßÇöµÇÁö ¾Ê¾Ò´Ù.
°á·Ð : ¸¶¿ì½º Á¾¾çÀÇ ÀϺο¡¼ 0.05 GyÀÇ Àú¼±·®ÀÌ °í¼±·® ¹æ»ç¼±¿¡ ÀÇÇÑ apoptosis À¯µµ¿¡ ´ë
ÇÏ¿© adaptive response¸¦ º¸ÀÌ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ÀÌ´Â Bcl-2, BaxÀÇ ¹ßÇö ¼öÁØ°ú Bcl-X µîÀÌ
°ü·ÃµÇ´Â °ÍÀ¸·Î º¸¿´´Ù. º» ¿¬±¸´Â ¹æ»ç¼±¿¡ ÀÇÇÑ apoptosis¿¡¼ adaptive responseÀÇ °ü·Ã¼ºÀÌ
ÀÏÁ¤Ä¡ ¾Ê´Ù´Â °ÍÀ» ¸¶¿ì½º Á¾¾ç¿¡¼ º¸¿©ÁÖ¾ú´Ù.
Purpose : To investigate the presence of adaptive response by low dose radiation in murine
tumors in relation to radiation induced apoptosis as well as related mechanism.
Materials and Methods : Syngeneic murine tumors, OCa-l and HCa-l, were given 0.05 Gy
pretreatment followed by therapeutic dose of 25 Gy radiation. Induction of apoptosis was
analyzed for each treatment group. Regulating molecules of apoptosis, p53, Bcl-2, Bax, Bcl-X,
were also analyzed by western blotting.
Results : In 0.05 Gy pretreatment group of OCa-l, 25 Gy-induced apoptosis per 1000 cells
was 229, which was estimated at 30£¥ lower level than the expected (p£¼0.05). In contrast,
this reduction in radiation induced apoptosis was not seen in HCa-l. In the expression of
apoptosis regulating molecules, p53 increased in both tumors in response to radiation. Bcl-2
and Bax did not show significant change in both tumors however, the expression of Bcl-2
surpassed that of Bax in 0.05 Gy pretreatment group of OCa-l. Bcl-X was not expressed in
OCa-l. In HCa-l, Bcl-X showed increased expression even with 0.05 Gy.
Conclusion : Adaptive response by low dose radiation is shown in one murine tumor, OCa-l,
in relation to radiation induced apoptosis. Apoptosis regulating molecules including Bcl-2/Bax
and Bcl-X, appear to related. This study shows an evidence that adaptive response is present,
but not a generalized phenomenon in vivo.
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¹æ»ç¼±; Radiation; Apoptosis; Adaptive response; Murine tumor;
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