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Nuclear factor I-C°¡ Ä¡±Ù¹ß»ý °úÁ¤¿¡¼­ Hertwig¡¯s »óÇÇÃÊ Çü¼º¿¡ ¹ÌÄ¡´Â ¿µÇâ

EFFECT OF THE NUCLEAR FACTOR I-C ON THE FORMATION OF HERTWIG¡¯S EPITHELIAL ROOT SHEATH DURING ROOT DEVELOPMENT

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½ÅÀÎö ( Shin In-Cheol ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­Á¶Á÷Çб³½Ç
¹ÚÁÖö ( Park Ju-Cheol ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­ÇغÎÇבּ¸¼Ò
Á¤¹®Áø ( Jeong Moon-Jin ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­Á¶Á÷Çб³½Ç
¿ÀÇöÁÖ ( Oh Hyun-Ju ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­Á¶Á÷Çб³½Ç
¹Ú¼±È­ ( Park Sun-Hwa ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­ÇغÎÇבּ¸¼Ò
ÀÌâ¼· ( Lee Chang-Seep ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç
±èÈïÁß ( Kim Heung-Joong ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­ÇغÎÇבּ¸¼Ò

Abstract

Ä¡¾ÆÀÇ Çü¼ºÀº »óÇÇ-°£¿±°£ÀÇ »óÈ£ÀÛ¿ëÀ» ÅëÇØ Á¶ÀýµÇ¾îÁö´Â º¹ÀâÇÑ ¹ß»ý°úÁ¤ÀÌ´Ù. Áö±Ý±îÁö Ä¡°üÀÇ ¹ß»ý¿¡ °ü¿©ÇÏ´Â À¯ÀüÀÚ ¹× ±×µéÀÇ ½ÅÈ£Àü´Þ°æ·Î¿¡ °üÇÑ ¿¬±¸´Â ´Ù¼ö ÁøÇàµÇ¾î ¿ÔÁö¸¸ Ä¡±ÙÀÇ ¹ß»ýÀ» Á¶ÀýÇÏ´Â ±âÀü¿¡ ´ëÇؼ­´Â º°·Î ¾Ë·ÁÁø °ÍÀÌ ¾ø´Ù. ÃÖ±Ù¿¡ NFI-C knock out »ýÁã¿¡¼­ Á¤»óÄ¡°ü¿¡ ºñÁ¤»óÀûÀÎ Ä¡±ÙÀ» °¡Áö´Â Ä¡¾Æ°¡ º¸°íµÇ¾ú´Ù.

º» ¿¬±¸ÀÇ ¸ñÀûÀº NFI-C°¡ ¾î¶»°Ô Ä¡±ÙÀÇ ÇüÅÂ¿Í »ó¾Æ¸ð¼¼Æ÷ÀÇ ºÐÈ­¿¡ °ü¿©ÇÏ´ÂÁö¸¦ ±Ô¸íÇÏ´Â °ÍÀÌ´Ù. NFI-C knock out »ýÁãÀÇ Ä¡±Ù ¹ß»ýµ¿¾È¿¡ HERSÀÇ ¿ªÇÒÀ» ¿¬±¸ÇÏ°íÀÚ cytokeratin ¸é¿ªÁ¶Á÷È­ÇÐÀû¹æ¹ý°ú Ä¡±Ù»ó¾ÆÁúÀÇ Æ¯¼ºÀ» ±Ô¸íÇϱâ À§ÇØ DSPP mRNA in-situ hybrydization¹ýÀ» ¼öÇàÇÏ¿´´Ù.

1. NFI-C knock out »ýÁãÀÇ Ä¡±ÙÇü¼º½Ã HERSÀÇ ¿ªÇÒ

Wild type°ú knock out type ¸ðµÎ¿¡¼­ cytokeratinÀº ¸ðµç HERS ¼¼Æ÷µé°ú ¹ÝÀÀÇÏ¿´°í, HERS¿Í ¹ý¶û»óÇÇ »çÀÌÀÇ ¾ç¼º¹ÝÀÀ¼¼Æ÷µéÀÇ ¿¬¼Ó¼ºÀº Ä¡°æºÎ ºÎÀ§¿¡¼­ ¼Ò½ÇµÇ¾ú´Ù. Knock out type¿¡¼­ Ä¡±Ù»ó¾ÆÁúÀÌ Ä§ÂøµÈ ÈÄ, cytokeratin ¾ç¼º-HERS ¼¼Æ÷µéÀº Ä¡°æºÎ¿¡¼­ ºÒ±ÔÄ¢ÇÑ ¹è¿­°ú ±Ø¼ºÀÇ »ó½ÇÀ» º¸¿´´Ù.

2. NFI-C knock out »ýÁãÀÇ Ä¡±Ù»ó¾ÆÁúÀÇ Æ¯¼º

DSPP mRNAÀÇ ¹ßÇöÀº wild type¿¡¼­ Ä¡°ü°ú Ä¡±Ù»ó¾ÆÁúÀÇ »ó¾Æ¸ð¼¼Æ÷ ¸ðµÎ¿¡¼­ °­ÇÑ ¹ßÇöÀ» º¸ÀÎ ¹Ý¸é, knock out type¿¡¼­´Â Ä¡°üºÎÀ§ »ó¾ÆÁúÀÇ »ó¾Æ¸ð¼¼Æ÷¿¡¼­¸¸ °­ÇÑ ¹ßÇöÀ» º¸¿´´Ù.

3. NFI-C knock out »ýÁãÀÇ Ä¡±Ù ¹ß»ý°úÁ¤¿¡¼­ HERS´Â Ä¡°üÀ¸·ÎºÎÅÍ Á¤»óÀûÀÎ È®ÀåÀ» º¸ÀÎ ¹Ý¸é, Ä¡±ÙºÎÀ§¿¡¼­ÀÇ »ó¾Æ¸ð¼¼Æ÷ ºÐÈ­´Â ½ÇÆÐÇÏ¿´´Ù.

À§ÀÇ °á°úµé·Î º¸¾Æ NFI-C´Â Ä¡±ÙÇü¼º °úÁ¤¿¡¼­ »ó¾Æ¸ð¼¼Æ÷ ºÐÈ­¿¡ Áß¿äÇÑ ¿ªÇÒÀ» ÇÏ´Â °ÍÀ¸·Î »ç·áµÈ´Ù.

Tooth formation is a complex developmental process that is mediated through a series of reciprocal epithelialmesenchymal interactions. Several signal pathways and transcription factors have been implicated in regulating molar crown development, but relatively little is known about the regulation of root development. It was reported that NFI-C knockout mice showed abnormal root formation with normal crown.

The aims of this study are to elucidate how the NFI-C regulate the determine of root shape and odontoblasts differentiation. We carried out immunohistochemistry using cytokeratin to investigate the role of Hertwig¡¯ s epithelial root sheath and DSPP mRNA in-situ hybridization to conform the nature of root dentin during root development in NFI-C knockout mice.

Cytokeratin reacted with all the HERS cells and the continuity of cytokeratin positive cells between the HERS cells and enamel epithelium was lost in the cervical region both wild and K/O types. After root dentin deposition cytokeratin positive-HERS cells showed irregularity and loss of polarity in the cervical region in K/O type.

DSPP mRNA was strongly expressed in odontoblasts of crown and root dentin in wild type mice, whereas expression of DSPP mRNA was restricted in odontoblast of crown dentin in the K/O type.

During root formation in NFI-C knockout mice, HERS normally grow out of the crown but fail to induce odontoblast differentiation in root portion.

These results suggest that NFI-C may play important roles in odontoblast differentiation during root dentin formation.

Å°¿öµå

NFI-C knockout;»ó¾Æ¸ð¼¼Æ÷ºÐÈ­;Ä¡±ÙÇü¼º;Cytokeratin DSPP
NFI-C knockout;Odontoblast differentiation;Root formation;Cytokeratin DSPP

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