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Expression of Bcl-2 Family in 4-Nitroquinoline 1-Oxide-Induced Tongue Carcinogenesis of the Rat

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Abstract

ÇѱÛÃÊ·ÏÀü ¼¼°èÀûÀ¸·Î ±¸°­¾ÏÀÇ ºóµµ´Â Á¡Á¡ Áõ°¡ Ãß¼¼À̸ç, ƯÈ÷ Çѱ¹ÀÎÀÇ ÀÖ¾î Çô(tongue)´Â ±¸°­¾ÏÀÌ °¡Àå È£¹ßÇÏ´Â Àå¼ÒÀÌ´Ù. ±¸°­¾ÏÀº ¹ß¾Ï ´Ü°è¿¡¼­ºÎÅÍ °úÁõ½Ä º´¼Ò(hyperplastic lesion), ÀÌÇü¼º(dysplasia) ¹× »óÇdz»¾Ï(carcinoma in situ) À» °ÅÃÄ ¾Ç¼º ¾ÏÁ¾À¸·Î ¹ßÀüÇÏ´Â ´Ù´Ü°è ¹ß¾Ï°úÁ¤À» º¸À̸ç, ºÐÀÚ »ý¹°ÇÐÀû º¯ÀÌ°¡ ±¸°­¾ÏÀ» ÁøÇà½ÃÅ´ÀÌ ³Î¸® ¾Ë·ÁÁ® ÀÖ´Ù. ¶ÇÇÑ, ±¸°­¾ÏÀº ÀϹÝÀûÀ¸·Î ¾Ï¼¼Æ÷ÀÇ Áõ½Ä ¹× °í»ç(apoptosis)ÀÇ ¾ïÁ¦°¡ Áß¿äÇÑ ¿ªÇÒÀ» ÇÏ°í ÀÖ´Ù ¾Ë·ÁÁ® ÀÖ´Ù. ±×¸®°í, Bcl-2 family ´Â ¼¼Æ÷ °í»ç¿¡ ÁÖ¿äÇÑ ¿ªÇÒÀ» ÇÏ°í ÀÖÀ½ÀÌ ¾Ë·ÁÁ® ÀÖ´Ù. ±×·¯³ª, À̵é°ú °ü·ÃÇÑ ±¸°­¾Ï ¹ß»ý°úÁ¤ÀÇ º¯È­¿¡ ´ëÇؼ­´Â ³Î¸® ¿¬±¸µÈ ¹Ù°¡ ¾ø´Ù.
º» ¿¬±¸´Â ¹é¼­¿¡¼­ ¹ß¾Ï ¹°ÁúÀÎ 4-NQO·Î ±¸°­¾ÏÀ» À¯µµ½ÃÅ°°í, ±¸°­¾Ï ¹ß»ý ´Ù´Ü°èº°·Î Bcl-2 familyÀÇ mRNA º¯È­¸¦ RT-PCRÀ» ÀÌ¿ëÇØ »ìÆ캸¾Ò´Ù.
Bcl-2 family´Â Å©°Ô 3±º, Áï 1) anti-apoptotic, 2) pro-apoptotic, ±×¸®°í 3) BH3 only proteinÀ¸·Î ºÐ·ùÇÒ ¼ö ÀÖÀ¸¸ç, º» ¿¬±¸¿¡¼­ anti-apoptotic moleculesÀÎ Bcl-w´Â ¸ðµç ±º¿¡¼­ ¹ßÇöÀÌ °¨¼ÒµÇ¾úÀ¸¸ç, Bcl-2´Â ¹ßÇöÀÌ Áõ°¡ µÇ¾ú´Ù. pro-apoptotic molecules¿¡¼­´Â Bad°¡ Á¦ 3±º (ÆíÆò¼¼Æ÷¾ÏÁ¾)¿¡¼­ ¹ßÇöÀÌ Áõ°¡ µÇ¾ú°í, ³ª¸ÓÁö´Â °¨¼ÒÇÏ¿´´Ù. BH-3 only protein¿¡¼­´Â Bmf°¡ Á¦ 2±º¿¡¼­, BBC3°¡ Á¦ 3±º¿¡¼­ ¹ßÇöÀÌ Áõ°¡ÇÏ¿´°í, ³ª¸ÓÁö´Â ¸ðµç±º¿¡¼­ °¨¼ÒÇÏ¿´´Ù.
°á·ÐÀûÀ¸·Î, 4-NQO·Î À¯µµµÈ ¹é¼­ÀÇ ¹ß¾Ï´Ü°è¿¡¼­, Bcl-2 familyÀÇ mRNA ¾ç»óÀº ´Ù¾çÇÏ°Ô °üÂûµÇ¾úÀ¸³ª, Bad ¹× BBC3 mRNA°¡ Á¦ 3±º¿¡¼­, Bmf mRNA°¡ Á¦ 2±º¿¡¼­ÀÇ ¹ßÇöÀÌ Æ¯º°ÇÔÀ» ¾Ë ¼ö ÀÖ¾î, ´Ù´Ü°è ¹ß¾Ï°úÁ¤¿¡¼­ÀÇ ±¸°­¾ÏÀ» Áø´ÜÇϴµ¥ À¯¿ëÇϸ®¶ó »ç·áµÈ´Ù.

The number of patients with tongue carcinoma is increasing rapidly among young individuals in many parts of the world. Oral carcinoma progresses from hyperplastic lesion through dysplasia to invasive carcinoma and the concept of "field cancerization" with molecular alteration has been suggested for oral cavity carcinogenesis. Significant improvement in treatment and prognosis will depend on more detailed understanding of the multi-step process leading to cancer development.
To induce tongue carcinoma in rat by 4-NQO, each drinking water was made to 10 ppm, 25 ppm, 50 ppm and control (only D.W. without 4-NQO). Specimens were classified into 4 groups such as control, I (mild & moderate dysplasia), II (severe dysplasia and carcinoma in situ), III (carcinoma). The mRNA expressions of Bcl-2 family were evaluated by RT-PCR technique.
For anti-apoptotic Bcl-2 family, mRNA expression of Bcl-w was down-regulated in all stages of tongue carcinogenesis model. However, mRNA expression of Bcl-2 was up-regulated. For pro-apoptotic Bcl-2 family, all members were down-regulated in all stages of tongue carcinogenesis model except for Bad mRNA in group III. In terms of BH3 only protein, mRNA expressions of Bok and Mcl-1 were down regulated in all stages of specimen, but Bmf in group II and BBC3 in group III were up-regulated.
Our current findings demonstrated the involvements of mRNA expression of Bcl-2 family in multi-step tongue carcinogensis. This highlights the necessity for continued efforts to discover suitable biomakers (Bcl-2 family) for early diagnosis of the disease, and to understand its pathogenesis as a first step in improving methods of treatment. The discovery of these potential biomarkers and molecular targets for cancer diagnostics and therapeutics has the potential to significantly change the clinical approach and outcome of the disease.

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