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È÷½ºÅæÅ»¾Æ¼¼Æ¿È¿¼Ò ¾ïÁ¦Á¦ Trichostatin A¿¡ ÀÇÇÑ Àΰ£ µÎ°æºÎ¾Ï ¼¼Æ÷ÁÖÀÇ ¹æ»ç¼± °¨¼ö¼º Áõ°­ Trichostatin A, a Histone Deacetylase Inhibitor, Potentiated Cytotoxic Effect of Ionizing Radiation in Human Head and Neck Cancer Cell Lines

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Abstract

¸ñ Àû: º» ¿¬±¸ÁøÀÌ ±â¿Õ¿¡ ÀÔÁõÇÑ ¹Ù ÀÖ´Â È÷½ºÅæÅ»¾Æ¼¼Æ¿È¿¼Ò ¾ïÁ¦Á¦ trichostatin A (TSA)°¡ ³ªÅ¸³»´Â ¹æ»ç¼± °¨¼ö¼º Áõ°­ ÀÛ¿ëÀÌ µÎ°æºÎ¾Ï ¼¼Æ÷ÁÖ¿¡¼­ ¹ß»ýÇÏ´Â Á¤µµ¸¦ ½ÇÇèÀûÀ¸·Î È®ÀÎÇÏ°íÀÚ ÇÏ¿´´Ù.

´ë»ó ¹× ¹æ¹ý: Àΰ£ µÎ°æºÎ¾Ï ¼¼Æ÷ÁÖÀÎ HN-3°ú HN-9¸¦ 0, 50, 100, 200 nMÀÇ TSA¿¡ 18½Ã°£ µ¿¾È Àüóġ½ÃŲ ÈÄ °¢°¢ 0, 2, 4, 6, 8 Gy ¹æ»ç¼±À» Á¶»çÇÏ¿´´Ù. ¼¼Æ÷»ýÁ¸°î¼±Àº clonogenic assay¸¦ ÀÌ¿ëÇÏ¿© »êÃâÇÏ¿´°í linear quadratic ¸ðµ¨¿¡ µû¶ó ºÐ¼®ÇÏ¿´´Ù.

°á °ú: ¹æ»ç¼± Á¶»ç Àü TSA 󸮴 HN-3°ú HN-9 ¼¼Æ÷ÁÖÀÇ ¹æ»ç¼± °¨¼ö¼ºÀ» Áõ°­½ÃÄ×´Ù. 50 nMÀÇ TSA·Î ó¸®µÈ HN-9 ¼¼Æ÷ÁÖ¿¡¼­ 2 Gy Á¶»çÈÄ »ýÁ¸ºÐȹ(SF2)Àº À¯ÀÇÇÑ ¼öÁØÀ¸·Î °¨¼ÒÇÏ¿´À¸³ª, HN-3 ¼¼Æ÷ÁÖ´Â 200 nMÀÇ TSA ó¸® ÈÄ SF2°¡ À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´´Ù. HN-3°ú HN-9 ¼¼Æ÷ÁÖ¿¡¼­ 200 nM TSAÀÇ sensitizer enhancement ratio´Â °¢°¢ 1.84¿Í 7.24¿´´Ù.

°á ·Ð: ¹æ»ç¼± Á¶»ç Àü È÷½ºÅæÅ»¾Æ¼¼Æ¿È¿¼Ò ¾ïÁ¦´Â Àΰ£ µÎ°æºÎ¾Ï ¼¼Æ÷ÁÖÀÇ ¹æ»ç¼± °¨¼ö¼ºÀ» Áõ°¡½ÃÄ×À¸¸ç, ÀÌ Áõ°­ ÀÛ¿ëÀÌ ¾Ï¼¼Æ÷ÁÖ¿¡¼­ÀÇ ÀϹÝÀûÀ¸·Î °üÂûµÇ´Â Çö»óÀÏ °¡´É¼ºÀÌ Å©´Ù°í Á¦¾ÈÇÑ´Ù.

Purpose: We have previously reported that human glioblastoma cells are sensitized to radiation-induced death after their exposure to trichostatin A (TSA), a histone deacetylase inhibitor (HDAC-I), prior to the irradiation. We aimed to measure the magnitude of the radiosensitizing effect of TSA in human head and neck cancer cell lines.

Materials and Methods: Human head and neck cancer cell lines, HN-3 and HN-9, were exposed to 0, 50, 100, and 200 nM TSA for 18 hr prior to irradiation. Then, the TSA-treated cells were irradiated with 0, 2, 4, 6, and 8 Gy, and cell survival was measured by clonogenic assay.

Results: Pre-irradiation exposure to TSA was found to radiosensitize HN-3 and HN-9 cell lines. In HN-9 cells, the fraction surviving after 2 Gy (SF2) was significantly reduced by treatment of TSA at concentration as low as 50 nM. However, a treatment with 200 nM TSA was required to significantly decrease SF2 in the HN-3 cell line. SER of pre-irradiation treatment with 200 nM TSA was 1.84 in HN-3 and 7.24 in HN-9, respectively.

Conclusions: Our results clearly showed that human head and neck cancer cell lines can be sensitized to ionizing radiation by pre-irradiation inhibition of histone deacetylase (HDAC) using TSA, and that this potentiation might well be a general phenomenon.

Å°¿öµå

Trichostatin A;È÷½ºÅæÅ»¾Æ¼¼Æ¿È¿¼Ò ¾ïÁ¦Á¦;¹æ»ç¼±°¨¼ö¼º;µÎ°æºÎ¾Ï ¼¼Æ÷ÁÖ;Trichostatin A;Histone deacetylase inhibitor;Radiosensitization;Head and neck cancer

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