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Abstract

¸ñ Àû: all-trans retinoic acid (ATRA)´Â ³úÁ¾¾ç ¼¼Æ÷ÀÇ Áõ½Ä¾ïÁ¦È¿°ú°¡ ÀÖÀ¸¸ç, ATRA¿Í ¹æ»ç¼±ÀÇ º´¿ëÀº ¾Ç¼º ³úÁ¾¾çÀÇ Ä¡·á È¿°ú¸¦ ÁõÁø½ÃÅ°´Â ¹æ¹ýÀÌ µÉ ¼ö ÀÖ´Ù. ±×·¯³ª ATRA¿¡ ÀÇÇØ Ç×»êÈ­È¿¼Ò°¡ Áõ°¡µÇ¸ç ÀÌ·Î ÀÎÇØ ¹æ»ç¼±¿¡ ÀÇÇØ »ý¼ºµÈ reactive oxygen species (ROS)°¡ Á¦°ÅµÈ´Ù¸é ¹æ»ç¼±ÀÇ È¿°ú´Â ³·¾ÆÁú ¼ö ÀÖ´Ù. º» ¿¬±¸¿¡¼­´Â ATRA¿¡ ÀÇÇØ À¯µµµÇ´Â Ä«Å»¶óÁ¦(catalase)¿¡ ÀÇÇÑ ¹æ»ç¼±°¨¼ö¼ºÀÇ º¯È­¸¦ º¸°íÀÚÇÏ¿´´Ù.

´ë»ó ¹× ¹æ¹ý: ¹é¼­ ±³Á¾¼¼Æ÷(36B10)À» ´ë»óÀ¸·Î ATRA ¹× ATRAÀÇ È­ÇÐÀû ¾ïÁ¦Á¦ÀÎ 3-amino-1, 2, 4-triazole (ATZ) ¿Í º´¿ëÇÏ¿© Ä«Å»¶óÁ¦ È°¼ºµµ, ¹æ»ç¼±°¨¼ö¼º ¹× ROSÀÇ º¯È­¸¦ ÃøÁ¤ÇÏ¿´´Ù. Ä«Å»¶óÁ¦ È°¼ºµµ´Â H2O2ÀÇ ¼Ò¸êÀ» Àڿܼ± ºÐ±¤±¤µµ°è·Î ÃøÁ¤ÇÏ´Â ¹æ¹ýÀ» ÀÌ¿ëÇØ Á¤·®ÇÏ¿´À¸¸ç, ¹æ»ç¼±°¨¼ö¼ºÀº ´ÜÀÏÁý¶ô±ºÇü¼º´É·ÂÀ¸·Î, ROS ´Â 2, 7-dichlorofluorescein diacetate ¸¦ ºÐ±¤±¤µµ°è·Î ÃøÁ¤ÇÏ¿´´Ù.

°á °ú: Ä«Å»¶óÁ¦ È°¼ºµµ´Â ATRAÀÇ ³óµµ(10, 25, 50¥ìM)¿¡ µû¶ó Áõ°¡ÇÏ¿´´Ù. ATRA (10¥ìM)¿Í ¹æ»ç¼±(4 Gy)ÀÇ º´¿ë¿¡ ÀÇÇØ »ýÁ¸ºÐȹÀº »ó½ÂÀû(supra-additive)À¸·Î °¨¼ÒÇÏ¿´À¸¸ç, ÀÌ °¨¼ÒµÈ »ýÁ¸ºÐȹÀº ATZ µ¿½Ã Åõ¿©¿¡ ÀÇÇØ Áõ°¡ÇÏ¿´´Ù. ATRA 10¥ìM ¶Ç´Â 25¥ìMÀ» 48½Ã°£ ó¸® ÈÄ ROS´Â ´ëÁ¶±º¿¡ ºñÇØ °¢°¢ 1.5¹è, 2¹è Áõ°¡ÇÏ¿´°í, 4 Gy¿Í ATRAÀÇ º´¿ë±º¿¡¼­´Â 2.5¹è Áõ°¡ÇÏ¿´´Ù. ATRA¿Í ¹æ»ç¼±ÀÇ º´¿ë¿¡ ÀÇÇØ Áõ°¡µÈ ROS´Â ATZ¿¡ ÀÇÇØ °¨¼ÒµÇ¾ú´Ù.

°á ·Ð: ATRA¿¡ ÀÇÇØ À¯µµµÇ´Â Ä«Å»¶óÁ¦´Â ¹æ»ç¼±°¨¼ö¼ºÀ» °¨¼Ò½ÃÅ°Áö ¾ÊÀ¸¸ç, ¿ÀÈ÷·Á ROSÀÇ Áõ°¡¿¡ ÀÇÇØ ¹æ»ç¼±°¨¼ö¼ºÀ» »ó½Â½ÃÄ×´Ù. µû¶ó¼­ ATRA¿Í ¹æ»ç¼±ÀÇ º´¿ëÀº ³úÁ¾¾çÀÇ Ä¡·á¿¡ À¯¿ëÇÑ ¹æ¹ýÀÌ µÉ ¼ö ÀÖÀ» °ÍÀ¸·Î º¸ÀδÙ.

Purpose: It has been reported that all-trans retinoic acid (ATRA) can inhibit glioma growing in vitro. However, clinical trials with ATRA alone in gliomas revealed modest results. ATRA has been shown to increase radiosensitivity in other tumor types, so combining radiation and ATRA would be one of alternatives to increase therapeutic efficacy in malignant gliomas. Thus, we intended to know the role of catalase, which is induced by ATRA, for radiosensitivity. If radiation-reduced reactive oxygen species (ROS) is removed by catalase, the effect of radiation will be reduced.

Materials and Methods: A rat glioma cell line (36B10) was used for this study. The change of catalase activity and radiosensitivity by ATRA, with or without 3-amino-1, 2, 4-triazole (ATZ), a chemical inhibitor of catalase were measured. Catalase activity was measured by the decomposition of H2O2 spectrophotometrically. Radiosensitivity was measured with clonogenic assay. Also ROS was measured using a 2, 7-dichlorofluorescein diacetate spectrophotometrically.

Results: When 36B10 cells were exposed to 10, 25 and 50¥ìM of ATRA for 48 h, the expression of catalase activity were increased with increasing concentration and incubation time of ATRA. Catalase activity was decreased with increasing the concentration of AT (1, 10 mM) dose-dependently. ROS was increased with ATRA and it was augmented with the combination of ATRA and radiation. ATZ decreased ROS production and increased cell survival in combination of ATRA and radiation despite the reduction of catalase.

Conclusion: The increase of ROS is one of the reasons for the increased radiosensitivity in combination with ATRA. The catalase that is induced by ATRA doesn`t decrease ROS production and radiosensitivity.

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·¹Æ¼³ëÀλê;³úÁ¾¾ç; ¹æ»ç¼±°¨¼ö¼º; Ä«Å»¶óÁ¦;Retinoic acid; Glioma; Radiosensitivity; Catalase

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