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The Effect of Estrogen Deficiency on Rat Pulpodentinal Complex

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±è¹Ì¸®/Kim MR ¾ç¿ø°æ/¹éÁø/±èÁ¾Áø/±è¿ø°æ/ÀÌ¿µ±Ô/Yang WK/Baek J/Kim JJ/Kim WK/Lee YK

Abstract

³­¼Ò ÀýÁ¦¼úÀ» ½ÃÇàÇÑ ¹é¼­¿¡¼­ ¿¡½ºÆ®·Î°Õ È£¸£¸óÀÇ °áÇÌÀ¸·Î ÀÎÇÑ »ó¾Æ-Ä¡¼ö º¹ÇÕüÀÇ º¯È­¸¦ °üÂûÇÏ¿´´Ù. 30 ¸¶¸®ÀÇ ¾Ï³ð Sprague-Dawley ratsÀ» µÎ ±ºÀ¸·Î ³ª´©¾î 1 ±ºÀº Sham-surgery¸¦ ½ÃÇàÇÏ¿´°í, 2 ±ºÀº ¾çÃø ³­¼Ò ÀýÁ¦¼úÀ» ½ÃÇàÇÏ¿´´Ù. ¹é¼­´Â 12ÁÖ µÚ¿¡ ¸ðµÎ Èñ»ý½ÃÄÑ, ÇÏ¾Ç Ä¡¾Æ¿Í ÀÎÁ¢ÇÑ Ä¡ÁÖÁ¶Á÷À» Æ÷ÇÔÇÏ¿© ÀýÁ¦ÇÏ¿´°í, $10\%$ Áß¼º Æ÷¸£¸»¸° ¿ë¾×¿¡ °íÁ¤ÇÏ¿´´Ù. µÎ ±ºÀÇ Â÷ÀÌÁ¡À» ºñ±³Çϱâ À§ÇÏ¿© ¹æ»ç¼± »çÁøÀ» ÃÔ¿µÇÏ°í, osteonectinÀ» ÀÌ¿ëÇÑ ¸é¿ª È­ÇÐ ¿°»ö¹ýÀ» ½ÃÇàÇÏ¿´´Ù. Á¶Á÷ ÇüÅÂÇÐÀû Â÷ÀÌÁ¡À» ÃøÁ¤Çϱâ À§ÇÏ¿© ¿µ»ó ºÐ¼® ÇÁ·Î±×·¥À» »ç¿ëÇÏ¿´°í, ºÐ¼® ¹æ¹ýÀ¸·Î´Â Paired t-test¸¦ »ç¿ëÇÏ¿´´Ù (p < 0.05). OsteonectinÀ» ÀÌ¿ëÇÑ ¸é¿ª È­ÇÐ ¿°»ö °á°ú, µÎ ±º°£¿¡´Â À¯ÀǼº ÀÖ´Â Â÷ÀÌÁ¡ÀÌ Á¸ÀçÇÏ¿´´Ù. ³­¼Ò ÀýÁ¦¼úÀ» ½ÃÇàÇÑ ¹é¼­±º¿¡¼­´Â Àü»ó¾ÆÁúÃþÀÇ µÎ²²°¡ ÇöÀúÈ÷ Áõ°¡ÇÏ¿´°í, Sham-surgery ±º¿¡¼­´Â Àü»ó¾ÆÁú Ãþ°ú Ä¡¼ö Á¶Á÷¿¡¼­ osteonectinÀÌ Á» ´õ ƯÀÌÀûÀ¸·Î ¿°»öµÇ¾î ³ªÅ¸³µ´Ù. ÀÌ·¯ÇÑ °á°ú·Î °á·ÐÁö¾îº¸¸é, ¹é¼­¿¡¼­ ÀÎÀ§ÀûÀ¸·Î ³­¼Ò ÀýÁ¦¼úÀ» ½ÃÇàÇÏ¿´À» ¶§ ±¤È­µÇÁö ¾ÊÀº Àü»ó¾ÆÁúÃþÀÇ µÎ²²°¡ Áõ°¡ÇÏ°í, Ä¡¼ö Á¶Á÷°ú Àü»ó¾ÆÁúÃþ³»ÀÇ osteonectin ÇÔ·®ÀÌ °¨¼ÒµÇ¸ç, °á±¹ ¿¡½ºÆ®·Î°Õ °áÇÌÀº Á¶»ó¾Æ ¼¼Æ÷ÀÇ ±âÀüÀ» º¯È­½ÃŲ´Ù°í ÇÒ ¼ö ÀÖ´Ù.

The purpose of this study was to investigate the effects of estrogen deficiency on pulpodentinal complex of tooth in ovariectomized rats. Thirty female Sprague-Dawley rats, 10 weeks old, were used. Rats were grouped into two groups. One group (n = 15) was subjected to sham surgery (SHAM) and the other group (n = 15) was ovariectomized bilaterally (OVX). Animals were sacrificed 12 weeks later, and their mandibular molars and associated periodontal supporting tissues were dissected out, and fixed in $10\%$ buffered formalin. For comparison of groups, immunostained for osteonectin. Histomorphometrical measurement of change of teeth was performed using an image analysis system and paired t-test was used and the level of significance for overall differences was set at p < 0.05. In immunostaining of osteonectin, they were significantly different from each other. The predentin thickness in OVX rats was wider than in SHAM rats. And in SHAM rats, osteonectin was more specifically stained in predentin areas than in OVX rats. These results indicate that estrogen deficiency increased the unmineralized predentin areas and decreased osteonectin content in pulpal tissues in rats. If our result is applicable to human studies, odotoblast is affected by estrogen deficiency.

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