Àá½Ã¸¸ ±â´Ù·Á ÁÖ¼¼¿ä. ·ÎµùÁßÀÔ´Ï´Ù.

µÎ°æºÎÁ¾¾ç ¼¼Æ÷ÁÖ¿¡¼­ Ku ´Ü¹éÁú ¹ßÇö Á¤µµ¿¡ µû¸¥ ¹æ»ç¼± ¹Î°¨µµ Expression of Ku Correlates with Radiation Sensitivities in the Head and Neck Cancer Cell Lines

´ëÇѹæ»ç¼±Á¾¾çÇÐȸÁö 2004³â 22±Ç 3È£ p.208 ~ 216
¼Ò¼Ó »ó¼¼Á¤º¸
ÀÌ»ó¿í/Lee SW À¯Àº½Ç/À̼ҷÉ/¼Õ¼¼Èñ/±èÁ¾ÈÆ/¾È½Âµµ/½Å¼º¼ö/ÃÖÀº°æ

Abstract

¸ñ Àû: DNA-dependent protein kinase (DNA-PK)´Â serine/threonine kinase·Î 470 kDaÀÇ catalytic subunit (DNA- PKcs)¿Í °¢°¢ 70 kDa°ú 86 kDaÀÇ ¹«°Ô¸¦ °®´Â Ku 70, Ku 80 ´Ü¹éÁú·Î ±¸¼ºµÈ´Ù. ÀÌ DNA-PK´Â ¹æ»ç¼±¿¡ ÀÇÇØ DNAÀÇ µÎ °¡´ÚÀÌ µ¿½Ã¿¡ Àý´ÜµÇ´Â °æ¿ì DNA ¼Õ»ó º¹±¸¿¡ ÇÙ½ÉÀû ¿ªÇÒÀ» ÇÏ´Â °ÍÀ¸·Î ¾Ë·ÁÁ® ÀÖ´Ù. º» ¿¬±¸¿¡¼­ Ku ¹ßÇö°ú ÀÌ¿ÂÈ­¹æ»ç¼±¿¡ ¹Î°¨µµ¿ÍÀÇ »ó°ü °ü°è¸¦ ¾Ë¾Æº¸°íÀÚ ÇÏ¿´´Ù.

´ë»ó ¹× ¹æ¹ý: ¿¹ºñ½ÇÇèÀ¸·Î µÎ°æµÎÁ¾¾ç ±â¿øÀÇ ¼¼Æ÷ÁÖ 9°³¿¡ ´ëÇÑ ¹æ»ç¼±¿¡ ´ëÇÑ ¹Î°¨µµ½ÇÇèÀ» ÇÑ °á°ú AMC-HN3ÀÌ ¹æ»ç¼±¿¡ °¡Àå ¹Î°¨ÇÏ¿´°í, AMC-HN9ÀÌ ¹æ»ç¼±¿¡ °¡Àå ÀúÇ×¼ºÀ» º¸¿© 2°³ÀÇ ¼¼Æ÷ÁÖ¿¡ ´ëÇÑ Ku70/80ÀÇ ¹ßÇöÀ» Western blot°ú ¸é¿ªÇü±¤ ¿°»öÀ» ½ÃÇàÇÏ¿© ¹æ»ç¼±ÀÇ ¹ÝÀÀµµ¿ÍÀÇ »ó°ü°ü°è¸¦ ¾Ë¾Æº¸¾Ò´Ù.

°á °ú: ¹æ»ç¼±¿¡ ÀúÇ×¼ºÀ» º¸ÀÌ´Â AMC-HN9¿¡¼­ Ku80 ¹ßÇöÀÌ ³ô¾Ò°í ¹æ»ç¼±¿¡ ¹Î°¨ÇÑ AMC-HN3¿¡¼­ ¼¼Æ÷ÀÚ¸ê»ç°¡ ´õ ¸¹ÀÌ ÀϾÀ» °üÂûÇÒ ¼ö ÀÖ¾ú´Ù.
°á ·Ð: Ku80 ´Ü¹éÁú ¹ßÇöÀÌ ³ôÀº ¼¼Æ÷´Â ¹æ»ç¼±¿¡ ´ëÇÑ DNA ¼Õ»ó º¹±¸°¡ ¸¹ÀÌ µÇ¾î ¹æ»ç¼±¿¡ ´ëÇÑ ³»¼ºÀ» º¸ÀÌ´Â °ÍÀ¸·Î »ý°¢µÇ¾ú´Ù.

Purpose: DNA-dependent protein kinase (DNA-PK) is a serine/threonine kinase consisting of a 470 kDa catalytic subunit (DNA-PKcs) and a heterodimeric regulatory complex, called Ku, which is composed of 70 kDa (Ku 70) and 86 kDa (Ku 80) proteins. The DNA-PK has been shown to play a pivotal role in rejoining DNA double-strand-breaks (dsb) in mammalian cells. The purpose of this study is to examine the relationship between the level of Ku expression and radiation sensitivity.

Methods and Materials: Nine head and neck, cancer cell lines showed various intrinsic radiation sensitivities. Among the nine, AMC-HN-3 cell was the most sensitive for X-ray irradiation and AMC-HN-9 cell was the most resistance. The most sensitive and resistant cell lines were selected and the test sensitivity of radiation and expression of Ku were measured. Radiation sensitivity was obtained by colony forming assay and Ku protein expression using Western blot analysis.

Results: Ku80 increased expression by radiation, wheres Ku70 did not. Overexpression of Ku80 protein increased radiation resistance in AMC-HN9 cell line. There was a correlation between Ku80 expression and radiation resistance. Ku80 was shown to play an important role in radiation damage response.

Conclusion: Induction of Ku80 expression had an important role in DNA damage repair by radiation. Ku80 expression may be an effective predictive assay of radiosensitivity on head and neck cancer.

Å°¿öµå

Ku70/80;ÀÌ¿ÂÈ­¹æ»ç¼±;µÎ°æºÎÁ¾¾ç ¼¼Æ÷ÁÖ;Ku70/80;irradiation;Head and neck cancer cell line

¿ø¹® ¹× ¸µÅ©¾Æ¿ô Á¤º¸

   

µîÀçÀú³Î Á¤º¸

KCI
KoreaMed
KAMS