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EXPRESSION OF OD314 DURING AMELOBLAST DIFFERENTIATION AND MATURATION

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¹ÚÁÖö/Park JC ¾È¼º¹Î/±èÈïÁß/Á¤¹®Áø/¹Ú¹ÎÁÖ/½ÅÀÎö/¼ÕÈ£Çö/Ahn SM/Kim HJ/Jeong MJ/Park MJ/Shin IC/Son HH

Abstract

¹ý¶û¸ð¼¼Æ÷´Â ¹ý¶ûÁúÀ» Çü¼ºÇÏ°í À¯ÁöÇÏ´Â ¼¼Æ÷·Î, ¹ý¶ûÁúÀÇ À¯±â±âÁúÀ» ºÐºñÇÏ°í ¹ý¶ûÁú ¼®È¸È­ °úÁ¤¿¡µµ °ü¿©ÇÑ´Ù. Ä¡¾Æ ¹ß»ý°úÁ¤¿¡¼­ ¹ý¶û¸ð¼¼Æ÷ÀÇ ºÐÈ­´Â ¼øÂ÷ÀûÀÎ »óÇÇ-°£¿± »óÈ£ÀÛ¿ë¿¡ ÀÇÇÏ¿© Á¶ÀýµÇ³ª, ºÐÈ­³ª ¼º¼÷°úÁ¤ÀÇ Á¤È®ÇÑ ±âÀüÀº ¾ÆÁ÷±îÁö Àß ¾Ë·ÁÁ® ÀÖÁö ¾Ê´Ù. ÃÖ±Ù¿¡ »ó¾Æ¸ð¼¼Æ÷¿¡¼­ óÀ½ ¹ß°ßµÈ OD314°¡ Ä¡¾Æ ¹ß»ý°úÁ¤¿¡¼­ »ó¾ÆÁúÀ» Çü¼ºÇÏ´Â »ó¾Æ¸ð¼¼Æ÷ »Ó ¾Æ´Ï¶ó ¹ý¶û¸ð¼¼Æ÷¿¡µµ ¹ßÇöµÈ´Ù°í ÇÏ¿´´Ù. ÀÌ¿¡ º» ¿¬±¸¿¡¼­´Â »ýÁã ÇÏ¾Ç ÀüÄ¡ÀÇ ´Ù¾çÇÑ ½Ã±âÀÇ ¹ý¶û¸ð¼¼Æ÷¸¦ ÀÌ¿ëÇÏ¿©, ÇüÅÂÇÐÀû ºÐ¼®°ú in-situ hybridization¿¡ ÀÇÇÑ OD314 mRNAÀÇ ¹ßÇö ±×¸®°í OD314 Ç×ü¸¦ ÀÌ¿ëÇÑ ¸é¿ªÁ¶Á÷È­ÇÐÀû ºÐ¼®À» ÅëÇÏ¿© OD314À¯ÀüÀÚÀÇ ¹ý¶û¸ð¼¼Æ÷ ºÐÈ­¿Í ¼º¼÷°úÁ¤¿¡¼­ÀÇ ¿ªÇÒÀ» ¿¬±¸ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. ÇüÅÂÇÐÀûÀ¸·Î ¹ý¶û¸ð¼¼Æ÷´Â ºÐÈ­ ´Ü°è¿¡ µû¶ó ºÐºñ Àü´Ü°è ¹ý¶û¸ð¼¼Æ÷, ºÐºñ±â ¹ý¶û¸ð¼¼Æ÷, ¼º¼÷±âÀÇ Æòź³¡ ¹ý¶û¸ð¼¼Æ÷¿Í ¼º¼÷±âÀÇ ÁÖ¸§³¡ ¹ý¶û¸ð¼¼Æ÷·Î ±¸ºÐµÇ¾ú´Ù. 2. OD314 mRNA´Â ºÐºñ±âÀÇ ¹ý¶û¸ð¼¼Æ÷¿¡¼­ºÎÅÍ ¹ßÇöµÇ±â ½ÃÀÛÇÏ¿© ¹ý¶û¸ð¼¼Æ÷°¡ ¼º¼÷ÇØ°¥ ¼ö·Ï ±× ¹ßÇöÀÌ Áõ°¡ÇÏ¿´´Ù. 3. OD314 ´Ü¹éÁúÀº ºÐºñ Àü´Ü°èÀÇ ¹ý¶û¸ð¼¼Æ÷¿¡¼­´Â ¹ßÇöµÇÁö ¾Ê°í, ºÐºñ±âÀÇ ¹ý¶û¸ð¼¼Æ÷¿¡¼­´Â ¼¼Æ÷Áú¿¡ ÀüüÀûÀ¸·Î ¹ßÇöµÇ¾ú´Ù. ¼º¼÷±âÀÇ Æòź³¡ ¹ý¶û¸ð¼¼Æ÷¿Í ÁÖ¸§³¡ ¹ý¶û¸ð¼¼Æ÷¿¡¼­´Â ¼¼Æ÷ÀÇ ±Ù½É°ú ¿ø½É³¡´Ü¿¡ OD314 ´Ü¹éÁúÀÌ °­ÇÏ°Ô ¹ßÇöµÇ¾ú´Ù. ÀÌ»óÀÇ °á°ú¸¦ Á¾ÇÕÇÏ¿© OD314´Â ¹ý¶û¸ð¼¼Æ÷ÀÇ ºÐÈ­¿Í ¼º¼÷°úÁ¤¿¡¼­ ¼¼Æ÷Áú ³»ºÎ¿¡¼­ Ư¡ÀûÀÎ ¿ªÇÒÀ» ÇÏ´Â °ÍÀ¸·Î »ç·áµÈ´Ù.

Ameloblasts are responsible for the formation and maintenance of enamel which is an epithelially derived protective covering for teeth. Ameloblast differentiation is controlled by sequential epithelial-mesenchymal interactions. However, little is known about the differentiation and maturation mechanisms. OD314 was firstly identified from odontoblasts by subtraction between odontoblast/pulp cells and osteoblast/dental papilla cells, even though OD314 protein was also expressed in ameloblast during tooth formation. In this study, to better understand the biological function of OD314 during amelogenesis, we examined expression of the OD314 mRNA and protein in various stages of ameloblast differentiation using in-situ hybridization and immunohistochemistry. The results were as follows : 1. The ameloblast showed 4 main morphological and functional stages referred to as the presecretory, secretory, smooth-ended, and ruffle-ended. 2. OD314 mRNA was expressed in secretory ameloblast and increased according to the maturation of the cells. 3. OD314 protein was not expressed in presecretory ameloblast but expressed in secretory ameloblast and maturative ameloblast. OD314 protein was distributed in entire cytoplasm of secretory ameloblast. However, OD314 was localized at the proxiamal and distal portion of the cytoplasm of smooth-ended and ruffle-ended ameloblast. These results suggest that OD314 may play important roles in the ameloblast differentiation and maturation.

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