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A STUDY ON HISTOMORPHOMETRICAL CHANGES OF TRABECULA AND EXPRESSION OF OSTEOPONTIN mRNA IN OVARIECTOMIZED RAT FEMUR

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Abstract

°á·Ð
¿©¼º¿¡¼­ Æó°æ±â ÈÄ ÈçÈ÷ ³ªÅ¸³ª´Â °ñ´Ù°øÁõÀº °ñÈí¼ö¿Í °ñÇü¼ºÀÇ ±ÕÇüÀÌ ¸ÂÁö ¾Ê´Â °ñ´ë
ü °úÁ¤ÀÇ ÀÌ»óÀ» Ư¡À¸·Î ÇÏ´Â ÁúȯÀ¸·Î¼­, ³ªÀÌ°¡ µç ¿©¼ºµéÀº °ñ´Ù°øÁõ¿¡ ÀÇÇÑ °ñÀý·Î
°íÅëÀ» ¹Þ´Â °æ¿ì°¡ ´Ã¾î³ª°í ÀÖ´Ù. ÀÌ¿¡ º» ¿¬±¸¿¡¼­´Â ¿¡½ºÆ®·ÎÁ¨ÀÌ °áÇÌµÈ »óȲ¿¡¼­ÀÇ
°ñÁ¶Á÷ º¯È­¸¦ ÇüÅ°èÃøÇÐÀû ¹æ¹ýÀ¸·Î ¿¬±¸ÇÔ°ú µ¿½Ã¿¡ °ñ¼¼Æ÷ÀÇ º¯È­¸¦ in situ
hybridization ¹æ¹ý¿¡ ÀÇÇØ °ñÇü¼º °úÁ¤¿¡ ¿µÇâÀ» ÁÖ´Â osteopontinÀÇ ¹ßÇö Á¤µµ¸¦ Á¶»çÇÏ¿©
°ñ´Ù°øÁõ°ú osteopontinÀÇ °ü°è¸¦ °üÂûÇÏ¿´´Ù.
½ÇÇ赿¹°·Î´Â üÁß 200g³»¿ÜÀÇ ÀÚ¼º¹é¼­¸¦ »ç¿ëÇÏ¿© ShamOP¿Í ³­¼ÒÀýÁ¦¸¦ ½ÃÇàÇÏ¿´°í,
3ÀÏ, 5ÀÏ, 7ÀÏ, 10ÀÏ, 14ÀÏ, 30ÀÏ ¹× 60ÀÏ° °¢°¢ 6¸¶¸®¾¿ Èñ»ýÇÏ¿©, ¾çÃø ´ëÅð°ñÀ» äÃëÇÏ¿´
´Ù. Åë¹ý¿¡ µû¶ó Ç¥º» Á¦ÀÛ ÈÄ H&E, MT stainÀ» ½ÃÇàÇÏ°í, ´ëÅð°ñ ±¸Á¶ÀÇ ÇüÅ°èÃøÇÐÀû °ü
ÂûÀ» À§ÇØ OPTIMAS soft ware¸¦ »ç¿ëÇÏ¿© ÃøÁ¤ÇÏ¿´´Ù. In situ hybridization ¹æ¹ýÀ¸·Î
Osteopontin mRNA ¹ßÇö ¼¼Æ÷¸¦ °è»êÇÏ¿© ºñ±³ÇÏ°í, Åë°èÇÐÀû °ËÁ¤Àº ANOVA Test¸¦ »ç
¿ëÇÏ¿´´Ù. ±¤ÇÐÇö¹Ì°æ °üÂû ÈÄ ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. ³­¼Ò Á¦°ÅÈÄÀÇ BV/TV(%)´Â ´ëÁ¶±º 58.14¡¾8.72¿¡ ºñÇÏ¿© ½ÇÇè 3ÀÏ°¿¡ 46.2¡¾6.75%·Î
´Ù¼Ò °¨¼ÒµÈ ¾ç»óÀÌ ÀÖÀ¸³ª Åë°èÀû À¯ÀǼºÀº ¾ø¾ú´Ù. ÀÌ·¯ÇÑ °¨¼Ò °æÇâÀº ½ÇÇè 14ÀÏ°±îÁö
ÁøÇàµÇ¾ú°í ½ÇÇè 30ÀÏ°¿Í 60ÀÏ°¿¡¼­´Â °¢°¢ 14.0¡¾4.07% ¹× 11.4¡¾4.73%À¸·Î ´ëÁ¶±º 47.2
¡¾8.79% ¹× 48.8¡¾7.54%¿¡ ºñÇÏ¿© Åë°èÀûÀ¸·Î À¯ÀǼº ÀÖ´Â °¨¼Ò¸¦ º¸¿´´Ù.
2. °ñÁֵβ²(trabecular thickness)´Â ½ÇÇè 3ÀÏ°ºÎÅÍ Àü ½ÇÇè±â°£ µ¿¾È °¨¼Ò °æÇâÀ» º¸¿´
À¸³ª Åë°èÀû À¯ÀǼºÀº ¾ø¾ú´Ù.
3. °ñÁÖ°£ °£°Ý(trabecular separation)Àº Àü ½ÇÇè±â°£¿¡ °ÉÃÄ ³Ð¾îÁö´Â °æÇâÀ» º¸¿´À¸¸ç
ƯÈ÷ ½ÇÇè 60ÀÏ°¿¡´Â ´ëÁ¶±º 124.2¡¾7.34§­, ½ÇÇ豺 319.5¡¾15.85§­·Î Åë°èÀûÀ¸·Î À¯ÀǼº ÀÖ
´Â (p<0.05) ¼Ò°ßÀ» º¸¿´´Ù.
4. Osteopontin mRNA ¹ßÇö ¼¼Æ÷´Â Á¤»ó 92.3÷Ï5.25§­¿¡ ºñÇÏ¿© ½ÇÇè 3ÀÏ°ºÎÅÍ ´Ù¼Ò °¨
¼ÒµÈ ¼Ò°ßÀ» º¸¿´°í, ÀÌ·¯ÇÑ °¨¼Ò Çö»óÀº ½ÇÇè Àü±â°£À» ÅëÇÏ¿© °üÂûµÇ¾ú´Ù. ƯÈ÷ ½ÇÇè 60ÀÏ
°¿¡¼­´Â ´ëÁ¶±º 93.25¡¾2.72§­, ½ÇÇ豺 24.3¡¾6.24§­·Î Åë°èÀûÀ¸·Î À¯ÀǼº ÀÖ´Â(p<0.05) °¨¼Ò
¸¦ º¸¿´´Ù.
ÀÌ»óÀÇ °á°ú¸¦ Á¾ÇÕÇÏ¸é ³­¼Ò ÀýÁ¦ ÈÄ °ñÇü¼ºÀÌ °¨¼ÒµÇ¾ú°í, ÀÌ·¯ÇÑ °ñÇü¼º °¨¼Ò´Â °ñ±â
Áú ¼ººÐÀÇ ÀÏÁ¾ÀÎ osteopontinÇÕ¼º ÀúÇÏ°¡ ÇÑ ¿øÀÎÀ¸·Î »ç·áµÇ¾ú´Ù.

Osteoporosis is a disease characterized by low bone mass and micro- architectural
deterioration of bone tissue, leading to enhanced bone fragility and a consequent increase
in fracture risk. Women are the most likely to suffer osteoporotic fractures. In the
second part of life bone mass decreases slowly, starting at about the age of 40 for
cortical bone and somewhat earlier for trabecular bone. The total loss will be about 50£¥
of the cancellous bone and 35£¥ of the cortical bone in women. The imbalance between
the bone resorption and bone formation can be caused by a decrease in the amount of
new bone formed. The biochemical causes of the negative balance are not known.
Therefore we studied to know the cause of negative balance after postmenopausal state
by histomorphometry and in situ hybridization (ISH) for osteopontin.
84 female Spraque-Dawley rats, weighing approximately 200g, and fed laboratory
chow ad libitum, were used in this study. Among those, 42 rats were sham operated,
and 42 rats in experimental group were ovariectomized. They were divided into 7 groups
consisting of 6 rats/group, and were serially sacrified on the 3, 5, 7, 10, 14, 30, and 60
days after operation and we obtained both femur of rats. After specimen preparation as
usual manner, it was stained with H&E, MT. For histomorphometrical study, the bone
structure was evaluated using the following parameters with OPTIMAS soft ware :
trabecular bone volume/tissue volume (BV/TV, £¥), trabecular thickness (Tb. Th., §­),
trabecular separation (Tb. Sp., §­). And in the way of ISH (in situ hybridization)
procedure, osteopontin mRNA expressing cell was calculated. Statistical differences
between OVX and sham-operated rats were evaluated using the ANOVA. After
examination and comparision of all specimens, the results of this study were as follows;
1. BV/TV(£¥) after overiectomy was decreased to 46.2¡¾6.75£¥, compared with 58.14¡¾
8.72£¥ of control group, with no statistical significance. These declination continued to 14
days postsurgery, in 30 and 60 days, it was decresed to 14.01¡¾4.07£¥ and 11.4¡¾4.73£¥
respectively, compared with 47.2¡¾8.79£¥ and 48.8¡¾7.54£¥ of control group, with
statistical significance detected.
2. Trabecular thickness (§­) was decresed from 3 days to the remaining periods, with
no statistical significance.
3. Trabecular separation (§­) was incresed throughout the study, especially in 60 days
postsurgery, control group was 124.2¡¾7.34§­ and experimental group was 319.5¡¾15.85§­,
with statistical significance detected at 60 days postsurgery (p<0.05).
4. Osteopontin mRNA expressing cells was decreased from 3 days postsurgery,
compared with 92.3¡¾5.25 of control group. And these declination was observed
throughout the study. Especially in 60 days postsurgery, control group was 93.25¡¾2.72
and experimental group was decresed to 24.3¡¾6.24, with statistical significance detected
(p<0.05).
from above results, after ovariectomy, bone formation was decreased, and it is thought
that these bone formation declination was due to supression of osteopontin synthesis,
which is the one of the bone matrix proteins.

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