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¹æ»ç¼±Á¶»ó¿¡ ÀÇÇÑ Áã Æó¼Õ»ó¿¡ ¹æ»ç¼±º¸È£Á¦·Î¼­ CaptoprilÀÇ ¿ªÇÒ¿¡ °üÇÑ ¿¬±¸ The Radioprotective Effect and Mechanism of Captopril on Radiation Induced Lung Damage in Rat

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Abstract

¸ñÀû: CaptoprilÀ» ¹æ»ç¼±Á¶»ç¿Í º´¿ëÇÏ¿© Á¶±â Æó¼Õ»óÀ» °¨¼Ò½Ãų ¼ö ÀÖ´Â ¹æ»ç¼±º¸È£Á¦·Î¼­ÀÇ ¿­ÇÒÀ» È®ÀÎÇÏ°í TNF ¥á¿Í TGF ¥â1¹æ»ç¼± º¸È£±âÀü¿¡ °ü¿©ÇÏ´ÂÁö¸¦ ¾Ë¾Æº¸°íÀÚ ÇÏ¿´´Ù.
´ë»ó ¹× ¹æ¹ý: ½ÇÇ赿¹°(Sprague-Dawley ÈòÁã)Àº Á¤»ó´ëÁ¶±º, ½ÇÇ豺(¹æ»ç¼± ´Üµ¶±º,
Captopril°ú ¹æ»ç¼± º´¿ë±º)À¸·Î ºÐ·ùÇÏ¿´´Ù. ½ÇÇ豺Àº 12.5 GyÀÇ ¹æ»ç¼±À» ÁÂÃø Èä°û¿¡ ´Ü
ÀÏÁ¶»ç ÇÏ¿´´Ù. Captopril°ú ¹æ»ç¼± º´¿ë±ºÀº Captopril (50 mg/kg/d)À» ¹æ»ç¼±Á¶»ç 1ÁÖÀüºÎ
ÅÍ ½ÇÇèÁ¾·á½ÃÀÎ 8ÁÖ±îÁö ½Ä¼ö¿¡ ¼¯¾î °æ±¸ Åõ¿©ÇÏ¿´´Ù. ½ÇÇè°á°ú´Â ¹æ»ç¼±Á¶»ç 2ÁÖ¿Í 8ÁÖ
ÈÄ¿¡ º´¸®Á¶Á÷ ¼Ò°ßÀ» ºÐ¼®ÇÏ¿´°í ¸é¿ªÁ¶Á÷È­Çп°»öÀ¸·Î TNF ¥á¿Í TGF ¥â1ÀÇ ¹ßÇöÀ» °ü
ÂûÇÏ¿´´Ù.
°á°ú: ¹æ»ç¼±Á¶»ç 2ÁÖ ÈÄ¿¡, Captopril°ú ¹æ»ç¼± º´¿ë±ºÀº ¹æ»ç¼± ´Üµ¶±º¿¡ ºñÇØ ÆóÆ÷°­³»
ÃâÇ÷, ÆóÆ÷ »óÇǼ¼Æ÷ º¯È­, ±â°üÁö »óÇǼ¼Æ÷ º¯È­, Ç÷°üº¯È­, Ç÷°üÁÖÀ§ ºÎÁ¾°ú °°Àº Á¶Á÷¼Ò°ß
ÀÇ Á¤µµ°¡ ÇöÀúÈ÷ °¨¼ÒµÇ¾ú´Ù. ¹æ»ç¼±Á¶»ç 8ÁÖ ÈÄ¿¡´Â ±â°üÁö »óÇǼ¼Æ÷ º¯È­¿Í Ç÷°üÁÖÀ§ ºÎ
Á¾ÀÌ ¹æ»ç¼± ´Üµ¶±º¿¡ ºñÇØ Àû¾ú´Ù. Captopril°ú ¹æ»ç¼± º´¿ë±º¿¡¼­ ¹æ»ç¼±Á¶»ç 2ÁÖÈÄ TNF
¥áÀÇ ¹ßÇöÀº ¹æ»ç¼± ´Üµ¶±º°ú ºñ±³½Ã ÆóÆ÷ »óÇǼ¼Æ÷(p<0.01) ¹× ÆóÆ÷ °­ÀÇ ´ë½Ä¼¼Æ÷
(p<0.01)¿¡¼­ ÇöÀúÈ÷ °¨¼ÒµÇ¾ú°í, ±â°üÁö ÁÖº¯ÀÇ ¸²ÇÁÁ¶Á÷(p=0.06)¿¡¼­´Â °¨¼ÒÇÏ´Â °æÇâÀ̾ú
´Ù. TGF ¥â1Àº ÆóÆ÷»óÇǼ¼Æ÷(p<0.02) ¹× ÆóÆ÷°­ÀÇ ´ë½Ä¼¼Æ÷(p<0.02)¿¡¼­ ¾ç¼º¼¼Æ÷°¡ ÇöÀúÈ÷
°¨¼ÒµÇ¾ú´Ù. ¹æ»ç¼± ´Üµ¶±º°ú ºñÇØ 2ÁÖÈÄ Captopril°ú ¹æ»ç¼± º´¿ë±ºÀÇ TNF ¥á´Â Â÷ÀÌ°¡
¾ø¾ú°í, TGF ¥â1ÀÇ ¹ßÇöÀº ÆóÆ÷°­ÀÇ ´ë½Ä¼¼Æ÷(p=0.09)¿¡¼­¸¸ °¨¼ÒÇÏ´Â °æÇâÀ̾ú´Ù.
°á·Ð: ÈòÁãÀÇ Æó¿¡ CaptoprilÀ» ¹æ»ç¼±°ú º´¿ëÅõ¿©ÇÏ¿© º´¸®Á¶Á÷ ¼Ò°ßÀ» °üÂûÇÑ °á°ú ¹æ»ç¼±
¿¡ ÀÇÇÑ Á¶±â Æó ¼Õ»óÀÌ °¨¼ÒµÊÀ» È®ÀÎÇÒ ¼ö ÀÖ¾ú´Ù ¶ÇÇÑ ¹æ»ç¼±Á¶»ç 2ÁÖ ÈÄ´Â TNF¥á ¿Í
TGF¥â1ÀÇ ¹ßÇöÀº ÆóÆ÷°­ÀÇ ´ë½Ä¼¼Æ÷(p=0.09)¿¡¼­¸¸ °¨¼ÒÇÏ´Â °æÇâÀ̾ú´Ù.
°á·Ð: ÈòÁãÀÇ Æó¿¡ CaptoprilÀ» ¹æ»ç¼±°ú º´¿ëÅõ¿©ÇÏ¿© º´¸®Á¶Á÷ ¼Ò°ßÀ» °üÂûÇÑ °á°ú ¹æ»ç¼±
¿¡ ÀÇÇÑ Á¶±â Æó ¼Õ»óÀÌ °¨¼ÒµÊÀ» È®ÀÎÇÒ ¼ö ÀÖ¾ú´Ù. ¶ÇÇÑ ¹æ»ç¼±Á¶»ç 2ÁÖ ÈÄ´Â TNF¥á¿Í
TGF¥â1ÀÇ ¹ßÇöÀÌ °¨¼ÒÇÏ°í, 8ÁÖ ÈÄ ¿¡´Â TGF¥â1 ¹ßÇöÀÇ °¨¼Ò°¡ µÃÂûµÇ¾î, CaptoprilÀÌ Á¶
±â Æó¼Õ»óÀ» ¾ïÁ¦ÇÏ´Â ¹æ»ç¼±º¸È£Á¦·Î¼­ ±âÀüÀÇ ÀϺο¡ TNF¥á¿Í TGF¥â1ÀÌ °ü¿©ÇÔÀ» È®ÀÎ
ÇÒ ¼ö ÀÖ¾ú´Ù.

Purpose: It was reported that captopril (angiotensin converting enzyme inhibitor) had and effect to reduce the pneumonitis and pulmonary fibrosis induced by radiation in rat. We performed this study to investigate the radioprotective effect and
mechanism of Captopril.
Methods and Materials: The comparison was made between the radiation only group and
the combined Captopril and radiation group by examining histopathologic findings and
immunohistochemical stains (TNF ¥á and TGF ¥â1) at 2 and 8 weeks after irradiation.
Each group has 8 to 10 rats (Sprague-Dawley). 12.5 Gy of X-ray was irradiated to the
left hemithorax in a single fraction. Captopril (50 mg/kg/d) mixed with water was given
per oral and continuously from 1 week prior to irradiation up to 8th week of the
experiment.
Result in the combined Captopril and radiation group, the histopathologic changes which
were hemorrahage into alveolar space, changes of alveolar epithelium, bronchial
epithelium and blood vessels, and perivascular edema were less severe than in the
radisation only group at 2 weeks. At 8 weeks, the alveolar epithelial changes and
perivascular edema were less prominant in the combined Captopril and radiation group.
At 2 weeks, the TNF ¥á expression of the combined Captopril and radiation group was
markedly decreased at the alveolar epithelium (p<0.01), lymphoid tissue (p=0.06) and the
macrophage of alveolar space (p<0.01) compared with the radiation only group.
Futhermore the TGF¥â1 expression was significantly prominant at the alveolar
epithelium (p<0.02) and the macrophage in alveolar space (p<0.02). At 8 weeks, the
expression of TNF¥á and TGF¥â1 of most sites, except TGF¥â1 of the macro phage of
alveolar space (p=0.09), showed no significant difference between 2 groups.
Conclusion: This study revealed that early lung damage induced by irradiation was
reduced with the addition of Captopril in the latent and early pneumonitis phase. The
expression of TNF¥á and TGF¥â1 at 2 weeks and TGF¥â1 at 8 weeks was further
decreased in the combined Captopril and radiation group than the radiation only group.
from these results, it may be concluded that the proinflammatoy cytokine (TNF¥á) and
firogenic cytokine (TGF ¥â 1) probably play the role of the radioprotective mechanism in
Captopril.

Å°¿öµå

Captopril; ¹æ»ç¼±º¸È£Á¦; Captopril; Radioprotector;

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