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EXPRESSION AND FUNCTION OF OD314, APIN PROTEIN, DURING AMELOBLAST DIFFERENTIATION AND AMELOGENESIS

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Abstract

º» ¿¬±¸¿¡¼­´Â ¹ý¶û¸ð¼¼Æ÷ ºÐÈ­¿Í ¹ý¶ûÁú Çü¼º¿¡ ¿¬°üÀÌ ÀÖ´Â OD314 Àϸí Apin proteinÀÇ ±â´ÉÀ» ¹àÈú ¸ñÀûÀ¸·Î, in-situ hybridization¿¡ ÀÇÇÑ OD314 mRNA ¹ßÇö°ú ¹ý¶û¸ð¼¼Æ÷ ¼¼Æ÷ÁÖ¿¡¼­ OD314¿Í enamel matrix proteinÀÇ ¹ßÇö, ±×¸®°í OD314 À¯ÀüÀÚ¸¦ °ú¹ßÇö/¾ïÁ¦½Ãų ¼ö ÀÖ´Â construct¸¦ Á¦ÀÛÇÑ ÈÄ ¹ý¶ûÁú Çü¼º Áß¿¡ OD314ÀÇ ±â´ÉÀ» ¾Ë¾Æº¸°íÀÚ RT-PCR¸¦ ½ÃÇàÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. OD314 mRNA´Â ¹ß»ýÁßÀÎ »ó¾Æ¸ð¼¼Æ÷º¸´Ù ¹ý¶û¸ð¼¼Æ÷¿¡¼­ °­ÇÏ°Ô ¹ßÇöµÇ¾ú´Ù. 2. TuftelinÀº ¼®È¸È­ °áÁ¤ÀÌ Çü¼ºµÇ´Â 14ÀϱîÁö ¹ßÇöÀÌ Áö¼ÓµÇ°í, ±× ÀÌÈĺÎÅÍ Á¡Â÷ °¨¼ÒÇÏ¿´´Ù. Amelogenin°ú enamelinÀº 7ÀϺÎÅÍ ±× ¹ßÇöÀÌ Á¡Á¡ °¨¼ÒÇÏ¿´´Ù. 3. U6-OD314 siRNA construct¸¦ ÀÌ¿ëÇÏ¿© transfectionÇÑ ¹ý¶û¸ð¼¼Æ÷ ¼¼Æ÷ÁÖ´Â OD314¿Í tuftelin, MMP20 mRNA ¹ßÇöÀÌ °¨¼ÒÇÏ¿´À¸¸ç, CMV-OD3l4¸¦ transfectionÇÏ¿© OD314ÀÇ °ú¹ßÇöÀ» À¯µµÇÑ °æ¿ì¿¡´Â OD3l4¿Í MMP20 mRNAÀÇ ¹ßÇöÀÌ ¶Ñ·ÇÀÌ Áõ´ëµÇ¾ú´Ù. ÀÌ °á°ú´Â OD314°¡ ¹ý¶û¸ð¼¼Æ÷ÀÇ ºÐÈ­¿Í ¹ý¶ûÁúÀÇ Çü¼º ±×¸®°í ¼®È¸È­ °úÁ¤¿¡ Áß¿äÇÑ ¿ªÇÒÀ» ÇÏ´Â »õ·Î¿î ÀÎÀÚÀÓÀ» ½Ã»çÇÑ´Ù.

This study was aimed to elucidate the biological function of OD314 (Apin protein), which is related to ameloblast differentiation and amelogenesis. Apin protein, calcifying epithelial odontogenic (pindborg) tumors (CEOTs)-associated amyloid, were isolated from CEOTs, and has similar nucleotide sequences to OD314. We examined expression of the OD314 mRNA using in-situ hybridization during tooth development in mice. Expression of OD314 and several enamel matrix proteins were examined in the cultured ameloblast cell line up to 28 days by reverse transcription-polymerase chain reaction (RT-PCR) amplification. After inactivation and over-expression of the OD314 gene in ameloblast cell lines using U6 vectordriven RNA interference and CMV-OD314 construct, RT-PCR were performed to evaluate the effect of the OD314 during amelogenesis. The results were as follows: 1. In in-situ hybridization, OD314 mRNAs were more strongly expressed in ameloblast than odontoblast. 2. When ameloblast cells were cultured in the diffcrentiation and mineralization medium for 28 days, the tuftelin mRNA expression was maintained from the beginning to day 14, and then gradually decreased to day 28. The expressions of amelogenin and enamelin were gradually decreased according to the ameloblast differentiation. 3. Inactivation of OD314 by U6-OD314 siRNA construct down-regulated the expression of OD314, MMP-20, and tuftelin, whereas over-expression of OD314 by CMV-OD314 construct up-regulated the expression of OD314 and MMP-20 without change in tuftelin. These results suggest that OD314 is considered as an ameloblast-enriched gene and may play the important roles in ameloblast differentiation and mineralization.

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Apin protein;OD314;Mineralization;Ameloblast differentiation;Amelogenesis

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