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HCT116 ¼¼Æ÷¿¡¼­ FBXL-6 À¯ÀüÀÚ¿¡ ÀÇÇÑ E2F Àü»ç È°¼º Á¶Àý Regulation of E2F-mediated Transcription by FBXL-6 in HCT116 Cell

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Abstract

F-box proteinÀº Ñépip-Cultin-F-box protein (SCF) complexÀÇ ±¸¼º ¿ä¼Ò·Î½á ubiquitin-dependentp¡¸oteolis°úÁ¤ Áõ ºÐÇØµÉ ±âÁúÀÇ ÀνÄÀÛ¿ë¿¡ ÁßÃßÀû ¿ªÇÒÀ» ¼öÇàÇÑ´Ù. ÀϺÎF-box proteinµéÀº cyclin 5, p27 µî°ú °°Àº ÁÖ¿ä cell cycle Á¶ÀýÀÚÀÇ ºÐÇØ¿¡ °ü·ÃµÇ¾î ÀÖ´Ù°í ¾Ë·ÁÁ® ÀÖ´Ù. º» ¿¬±¸¿¡¼­´Â À¯ÀüÀÚ µ¿Á¤¿¡ ´ëÇÑ º¸°í¸¸ ÀÖÀ» »Ó »óÀ§ ȤÀº ÇÏÀ§ À¯ÀüÀÚ¿ÍÀÇ ±¸Ã¼Àû¹Î ÆÇ°è ¹× ±× ÀÛ¿ë±âÀü¿¡ ´ëÇÑ ¿¬±¸°¡ Àü¹«ÇÑ F-box and leucine-rich repeatprotein 6 (FB:Ñê-6)°¡ ¼¼Æ÷ ¼ºÀå Á¶ÀýÀÇ ÁßÃßÀû Àü»çÀÎÀÚÀÎ E2FÀÇ È°¼º Á¶Àý¿¡ ¹ÌÄ¡´Â¿µÇâ¿¡ ´ëÇÏ¿© Á¶»çÇÏ¿´´Ù. 5¢¥¸»´Ü ºÎÀ§ÀÇ ÀϺΠ¿°±â¼­¿­ÀÌ °á¿©µÈ FBXL-6À¯ÀüÀÚ¸¦³»ÀçÀû E2FÀü»ç È°¼ºÀÌ ¾ïÁ¦µÇ¾î ÀÖ´Â ´ëÀå¾Ï ¼¼Æ÷ÁÖ HCTl16¿¡¼­ °ú¹ßÇö½ÃŲ °æ¿ìE2FÀÇ È°¼ºÀÌ À¯ÀÇÇÏ°Ô Áõ°¡µÊÀ» È®ÀÎÇÏ¿´´Ù. RT-PCR ºÐ¼®¿¡ ÀÇÇϸé fBXL-6ÀÇ irIRNA´Â °ÅÀÇ ¸ðµç ¾Ï¼¼Æ÷¿¡¼­ ¹ßÇöµÊÀ» °üÂûÇÏ¿´´Ù. ¶ÇÇÑ full-length¹ßÇö º¤Å͸¦ »ç¿õÇÏ¿©ÚìCTl16 ´ëÀå¾Ï ¼¼Æ÷¿Í °£¾Ï ¹× À§¾Ï Á¦Æ÷¿¡¼­ Øí2f Àü»ç È°¼º¿¹ ´ëÇÑ fBB±ä-6 À¯ÀüÀÚÀÇ°ú¹ßÇö¿¡ µû¸£´Â È¿°ú¸¦ Á¶»çÇÑ °á°ú, ´ëºÎºÐÀÇ ¾Ï¼¼Æ÷¿¡¼­ E2F Àü»çÈ°¼ºÀÌ Á¾°¡µÊÀ»°Åµì È®ÀÎÇÏ¿´´Ù. ÀÌ»óÀÇ °á°ú·Î º¼ ¶§ fBXL-6 À¯ÀüÀÚ´Â ´ëºÎºÐÀÇ ¼¼Æ÷¿¡¼­ ¹ßÇöµÇ¸ç,°ú¹ßÇö ½Ã ¼¼Æ÷ ³»¿¡¼­ÀÇ E2F Àü»ç È°¼ºÀ» Áõ°¡½Ãų ¼ö ÀÖÀ½ÀÌ È®ÀεǾú´Ù. ÀÌ°ÍÀºFBXL-6 À¯ÀüÀÚ°¡ E2F paÔÐway»óÀÇ ¾î¶² ´Ü¹éÁú¿¡ ´ëÇÑ Post-translational BnaÀýificationÀ»ÅëÇØ ±× È°¼ºÀÌÇÏ ¾ÈÁ¤¼ºÀ» Á¶ÀýÇÒ °¡´É¼ºÀÌ ÀÖÀ½À» ½Ã»çÇÏ´Â °á°ú¶ó ÇÒ ¼ö ÀÖ´Ù.

F-box proteins are components of Skplp-Cullin-F-box protein (SCF) ubiquitin-ligase complexes, where they mediate the critical step of substrate recognition. Some of the F-box proteins are responsible for selective degradation of cell cycle regulators. The F-box and leucine-rich repeat protein 6 (FBXL-6), an isoform of F-box protein family, has been cloned but its functions are barely known. In this report we examined the effect of FBXL-6 on the E2F-mediated transcription in HCT 116 colorectal cancer cells. First, we found through transient transfection of E2F-responsive reporter vectors that the E2F activity is significantly repressed in HCT116 cells. Forced expression of 5¢¥-truncated FBXL-6 in these cells could help the repression relieved and increase the E2F-mediated transcriptional activity. RT-PCR analysis revealed that the FBXL-6 mRNA is expressed in most of the cancer cells at varying degrees. We then confirmed, using a full-length cDNA expression vector, that FBXL-6 could augment the E2F-mediated transcription in various other cancer cell lines originated from hepatocellular, gastric or colorectal cancers. These results suggest the possibility that FBXL-6 may regulate the activity or stability of a protein constituting the E2F pathway via a post-translational modification.

Å°¿öµå

E2F Àü»çÀÎÀÚ;F-box ´Ü¹éÁú;FBXL-6;HCT116 ¼¼Æ÷ÁÖ
E2F transcription factor;F-box protein;FBXL-6;HCT116 cells

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