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THE EFFECT OF SODIUM FLUORIDE ON THE PHYSIOLOGICAL ROLE OF OSTEOBLASTIC CELL
¼Ò¼Ó »ó¼¼Á¤º¸
±è´ë¾÷/Dae-Eop Kim
KMID : 0358919980250030635
Abstract
°á·Ð
º» ½ÇÇèÀ» ÅëÇÏ¿© ascorbic acid¿Í organic phosphate°¡ ÷°¡µÈ ¹è¾ç¾×À¸·Î Á¶°ñ¼¼Æ÷¸¦ ¹è
¾çÇÏ°í ¿©±â¿¡ ºÒȳªÆ®·ýÀ» Åõ¿©ÇÑ ÈÄ ¼®È¸ÈµÈ °ñÁ¶Á÷ °áÀý (mineralized bone nodule) Çü
¼ºÀ» °üÂûÇÏ¿´À¸¸ç, ¿°±â¼º ÀλêºÐÇØÈ¿¼ÒÀÇ È°¼ºµµ¸¦ ÃøÁ¤ÇÏ¿´´Ù.
[3H]-thymidine incorporationÀ» ÅëÇÏ¿© Á¶°ñ¼¼Æ÷ÀÇ Áõ½Ä¿¡ ¹ÌÄ¡´Â ºÒȳªÆ®·ý
ÀÇ ¿µÇâÀ» ¾Ë¾Æ º¸¾Ò´Ù. ºÒȳªÆ®·ý Åõ¿©¿¡ µû¸¥ Shc°ú Grb2ÀÇ ÀλêÈ ¾ç»ó°ú Shc°ú Grb2
´Ü¹éÁúÀÇ ¾çÀû º¯Èµµ °üÂûÇÏ¿´À¸¸ç, ¾Æ¿ï·¯ cAMP response element binding
protein(p-CREB)ÀÇ ÀλêÈ¿¡ ¹ÌÄ¡´Â ºÒȳªÆ®·ýÀÇ ¿µÇâÀ» °üÂûÇÑ ¹Ù, ´ÙÀ½°ú °°Àº °á°ú¸¦
¾ò¾ú´Ù.
1. ºÒȳªÆ®·ýÀÌ Á¶°ñ¼¼Æ÷±º¿¡¼ ¼®È¸È °áÀý Çü¼º¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» °üÂûÇÑ ¹Ù, 0, 7, 14 ÀÏ
°ÀÇ Á¶°ñ¼¼Æ÷±º ¼¼Æ÷¸¦ l0¥ìM ºÒȳªÆ®·ýÀ¸·Î 48½Ã°£ µ¿¾È ó¸®ÇÏ¿´À» ¶§, 21ÀÏÀÇ ¹è¾ç±â
°£ ÈÄ Çü¼ºµÈ ¼®È¸È °áÀý¼ö´Â ´ëÁ¶±º¿¡ ºñÇØ ¾à 2¹è Á¤µµ À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ¿´´Ù(P<0.05).
2. ºÒȳªÆ®¸¨ÀÌ Á¶°ñ¼¼Æ÷±º¿¡¼ ¿°±â¼º ÀλêºÐÇØ È¿¼Ò È°¼º¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» °üÂûÇÑ ¹Ù,
ºÒȳªÆ®·ýÀÇ ³óµµ°¡ Áõ°¡ÇÔ¿¡ µû¶ó ¿°±â¼º ÀλêºÐÇØ È¿¼Ò È°¼ºµµ°¡ À¯ÀÇÇÑ °¨¼Ò¸¦ º¸¿´´Ù
(P<0.05).
3. ºÒȳªÆ®·ýÀÌ Á¶°ñ¼¼Æ÷±ºÀÇ Áõ½Ä¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» °üÂûÇÑ ¹Ù, Á¶°ñ¼¼Æ÷ÀÇ DNA ÇÕ¼ºÀº
´ëÁ¶±º¿¡ ºñÇØ ºÒȳªÆ®·ýÀÇ ³óµµ°¡ Áõ°¡ÇÔ¿¡ µû¶ó À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ¿´´Ù(P<0.05).
4. ºÒȳªÆ®·ýÀÌ Shc°ú Grb2ÀÇ ´Ü¹éÁú ÀλêÈ ¹× ´Ü¹éÁú·®ÀÇ º¯È¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» °üÂû
ÇÑ ¹Ù, ºÒȳªÆ®·ýÀÇ ³óµµ°¡ Áõ°¡ÇÔ¿¡ µû¶ó Shc°ú Grb2ÀÇ ÀλêÈ°¡ Áõ°¡ÇÏ¿´´Ù.
5. ºÒȳªÆ®·ýÀÌ CREBÀÇ ÀλêÈ¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» °üÂûÇÑ ¹Ù, CREBÀÇ ¹ßÇö¿¡´Â ¿µÇâÀÌ
¾ø¾úÀ¸³ª phospho-CREBÀÇ ¹ßÇö·®Àº ºÒȳªÆ®·ýÀÇ ³óµµ°¡ Áõ°¡ÇÔ¿¡ µû¶ó °¨¼ÒÇÏ¿´´Ù. °á·Ð
ÀûÀ¸·Î, º» ¿¬±¸¸¦ ÅëÇÏ¿© °ñÇü¼ºÀÌ Á¶°ñ¼¼Æ÷ÀÇ Áõ½Ä¿¡ ±âÀÎÇÏ°í ºÒȳªÆ®·ýÀÌ À̸¦ È¿°úÀû
À¸·Î ÀÚ±ØÇÏ¿´À½À» ÀÔÁõÇÏ¿´À¸¸ç ¶ÇÇÑ, Á¶°ñ¼¼Æ÷ÀÇ Áõ½Ä Á¶Àý¿¡ Áß¿äÇÑ Shc°ú Grb2 »çÀÌÀÇ
»óÈ£½ÅÈ£ Àü´Þ °úÁ¤À» ±Ô¸íÇÒ ¼ö ÀÖ¾ú´Ù.
#ÃÊ·Ï#
The clinical use of fluoride with a well known osteogenic action in osteoporotic
patients is rational, because this condition is characterized by impaired bone formation.
However, its anabolic effect has not been demonstrated well in vitro. The purpose of
this study was to investigate the effects of sodium fluoride on the physiological role of
osteoblastic cell. Osteoblastic cells were isolated from fetal rat calvaria. The results were
as follows :
1. Mineralized nodules were shown in osteoblastic cell cultures, which had been
maintained in the presence of ascorbic acid and ¥â-glycerophosphate up to 21 days.
When cultures were treated with pulses of 48 hr duration before apparent mineralization
was occurring, 2-fold increased in their number was detected.
2. Alkaline phosphatase activity of osteoblastic cells was inhibited by sodium fluoride in
dose-dependent manner.
3. The effect of sodium fluoride on the osteoblastic cell proliferation was measured by
the incorporation of [3H]-thymidine into DNA. As a result, sodium fluoride
at 1¡100¥ìM increased the [3H]-thymidine incorporation into DNA in a
dose dependent manner.
4. The signaling mechanism activated by sodium fluoride dose-dependently enhanced
the tyrosine phosphorylation of the adaptor molecule Shcp66 and their
association with Grb2, one of earlier events in a MAP kinase activation pathway
cascade used by a significant subset of G protein-coupled receptors.
5. The phosphorylation of CREB(cAMP response element binding protein)was inhibited
by the sodium fluoride in MC3T3E1 cells. In conclusion, the results of this study
suggested that the mitogenic effect of the sodium fluoride in MC3T3E1 cell was
stimulated in a dose-dependent manner and suggested 'an important role for the
interaction between Shc and Grb2' in controlling the proliferation of osteoblasts.
Å°¿öµå
Sodium fluoride; Alkaline phosphatase; Shc; Grb2; CREB;
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