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¸¶¿ì½º °£¾Ï¿¡¼­ Ç×¾ÏÁ¦-¹æ»ç¼± º¹ÇÕ¿ä¹ýÀ» ÀÌ¿ëÇÑ Ä¡·á È¿°ú Çâ»ó Enhancement of Tumor Radioresponse by Combined Chemotherapy in Murine Hepatocarcinoma

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¼ºÁø½Ç/Jinsil Seong ±è¼ºÈñ/¼­Ã¢¿Á/Sung Hee Kim/Chang Ok Suh

Abstract

¸ñÀû: ¸¶¿ì½º °£¾Ï¿¡¼­ ¹æ»ç¼±°ú °¢Á¾ Ç×¾ÏÁ¦¿ÍÀÇ º¹ÇÕ¿ä¹ýÀ» ½ÃÇàÇÏ¿©, ¹æ»ç¼± °¨¼ö¼ºÀ» Áõ°¡½Ãų ¼ö ÀÖ´Â ¾à¹°À» Ž»öÇÏ°íÀÚ ÇÏ¿´´Ù.
¹æ¹ý: C3H/HeJ ¸¶¿ì½º¿¡ ¸¶¿ì½º °£¾ÏÀÎ HCa-lÀ» À̽ÄÇÏ°í, Æò±Õ Á÷°æ 8 mm¿¡ À̸£·¶À»
¶§, ¹æ»ç¼± Á¶»ç(25 Gy), Ç×¾Ï ¾à¹°(5-Fu, 150 mg/kg; adriamycin, 8 mg/kg; paclitaxel, 40
mg/kg;gemcitabine, 50 mg/kg), ¶Ç´Â ¹æ»ç¼±°ú Ç×¾Ï ¾à¹°ÀÇ º¹ÇÕ Ä¡·á¸¦ ½ÃÇàÇÏ¿´´Ù. Ä¡·á
¿¡ ´ëÇÑ Á¾¾ç ¹ÝÀÀÀº Á¾¾ç ¼ºÀå Áö¿¬°ú Ç×Áø¿äÀÎÀ¸·Î ºÐ¼®ÇÏ¿´´Ù. Ç×Áø È¿°ú¸¦ º¸ÀÎ ¾à¹°¿¡
´ëÇÏ¿© ±× ±âÀü ¿¬±¸´Â Á¶Á÷ ÀýÆí¿¡¼­ apoptotic ¼öÁØÀ» Æò°¡ÇÏ°í, ¶ÇÇÑ Á¶Àý¹°ÁúÀÇ ¹ßÇöÀ»
ºÐ¼®ÇÏ¿´´Ù. p53, Bcl-2, Bax Bcl-XL, Bcl-XS, p21WAF1/CIP1ÀÇ ¹ßÇö ºÐ¼®Àº
western blottingÀ¸·Î ÇÏ¿´´Ù.
°á°ú: Gemcitabine ¸¸ÀÌ ¹æ»ç¼± °¨¼ö¼ºÀ» Áõ°¡½ÃÅ°´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù(Ç×Áø¿äÀÎ:1.6).
Gemcitabine°ú ¹æ»ç¼±ÀÇ º¹ÇÕ Ä¡·á´Â apoptosis À¯µµ¿¡¼­´Â ºÎ°¡Àû ¼öÁظ¸À» º¸¿´´Ù. Á¶Àý
¹°ÁúÀÇ ¹ßÇö ¾ç»óÀº ¹æ»ç¼± ´Üµ¶¿¡ ºñÇÏ¿© ¹æ»ç¼±°ú gemcitabineÀÇ º´¿ë½Ã
p21WAF1/CIP1p21ÀÇ Áõ°¡°¡ À¯ÀÇÇÏ°Ô °üÂûµÇ¾ú´Ù.
°á·Ð: GemcitabineÀº ¸¶¿ì½º °£¾Ï¿¡¼­ ¹æ»ç¼± °¨¼ö¼ºÀ» Áõ°¡½ÃŲ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. À̸¦
Á¶ÀýÇÏ´Â ¿ä¼Ò·Î¼­ p21WAF1/CIP1ÀÌ °ü¿©ÇÒ °ÍÀ¸·Î »ý°¢ µÈ´Ù.

Backgrounds: The purpose of this study was to identify drugs that can enhance radioresponse of murine hepatocarcinoma.
Methods: C3H/HeJ mice earing 8 mm tumors of murine hepatocarcinoma, HCa-1, were
treated with 25 Gy radiation and one of the following drugs: 5-Fu, 150 mg/kg;
adriamycin, 8 mg/kg; cisplatin, 6 mg/kg; paclitaxel, 40 mg/kg; and gemcitabine, 50
mg/kg. Tumor response to the treatment was determined by tumor growth delay assay
and by enhancement factor. Apoptotic level was assessed in tissue sections. Expression
of regulating molecules was analyzed by western blotting for p53, Bcl-2, Bax, Bcl-XL,
Bcl-XS, and p21WAF1/CIP1.
Results: Among the drugs tested, only gemcitabine enhanced the antitumor effect of
radiation, with enhancement factor of 1.6. Induction of apoptosis by a combination of
gemcitabine and radiation was shown as only additive level. In analysis of
radiation-induced expression of regulating molecules, the most significant change by
combining gemcitabine was activation of p21WAF1/CIP1.
Conclusion: Gemcitabine is the first drug showing an enhancement of radioresponse in
murine hepatocarcinoma, when combined with radiation. The key element of
enhancement is thought to be p21WAF1/CIP1.

Å°¿öµå

°£¾Ï; Gemcitabine; ¹æ»ç¼±; Apoptosis; p21WAF1/CIP1; Hepatocarcinoma; Gemcitabine; Radiation; Apoptosis; p21WAF1/CIP1;

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