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Surfactant Protein A, B ¿Í C À¯ÀüÀÚ ¹ßÇöÀÇ Circadian Rhythm¿¡ °üÇÑ ½ÇÇèÀû ¿¬±¸ Circadian rhythm of surfactant protein A, B and C mRNA in rats

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±èÁ¤¹Ì/Chung Mi Kim ¼ÕÀå¿ø/¾ç¼®Ã¶/À±È£ÁÖ/½Åµ¿È£/¹Ú¼º¼ö/Jang Won Sohn/Seok Chul Yang/Ho Joo Yoon/Dong Ho Shin/Sung Soo Park

Abstract

º» ½ÇÇè¿¡¼­´Â Á㸦 ´ë»óÀ¸·Î ÇÏ¿© ¿ÀÀü 9½Ã, ¿ÀÈÄ 4½Ã ¹× ¿ÀÈÄ 11½Ã¿¡ °¢°¢ Èñ»ý½ÃÄÑ SP-A, B, ¿Í CÀÇ À¯ÀüÀÚ ¹ßÇö¾ç»óÀ» filter hybridization ¹æ¹ýÀ¸·Î, ÆóÀÇ SP-A ´Ü¹é·®À» double sandwich ELISA ¹æ¹ýÀ¸·Î °¢°¢ °Ë»çÇÏ¿© surfactant ´Ü¹é A, B ¿Í C ÀÇ À¯ÀüÀÚ
¹ßÇö¿¡
´ëÇÑ ÀÏÁֱ⠸®µëÀ» °üÂûÇÏ°í, SP-A ´Ü¹é¾çÀ» ÃøÁ¤
ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. SP-A mRNA·®Àº ´ëÁ¶±º (¿ÀÀü 9½Ã)¿¡ ºñÇÏ¿© ¿ÀÈÄ 4½Ã¿¡ 23.5%°¡ À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´´Ù (p<0.05).
2. SP-B mRNA·®Àº ´ëÁ¶±º (¿ÀÀü 9½Ã)¿¡ ºñÇÏ¿© ¿ÀÈÄ4½Ã, ¿ÀÈÄ 11½Ã¿¡ 15.1%, 5.7%°¡ °¢°¢ °¨¼ÒÇÏ¿´´Ù (p=0.07, p=0.69).
3. SP-C mRNA·®Àº ´ëÁ¶±º (¿ÀÀü 9½Ã)¿¡ ºñÇÏ¿© ¿ÀÈÄ4½Ã, ¿ÀÈÄ11½Ã¿¡ 6.8%, 7.7%°¡ °¢°¢ °¨¼ÒÇÏ¿´´Ù (p=0.38, p=0.57).
4. SP-A ´Ü¹é·®Àº ´ëÁ¶±º (¿ÀÀü 9½Ã)¿¡ ºñÇÏ¿© ¿ÀÈÄ4½Ã, ¿ÀÈÄ11½Ã¿¡ 5.3%, 15.9%°¡ °¢°¢ Áõ°¡ÇÏ¿´´Ù (p=0.64, p=0.47).
ÀÌ»óÀÇ °á°ú´Â ½ÇÇ赿¹° ³» ½Ã°£¿¡ µû¸¥ SP-A, SP-B ¿Í SP-C À¯ÀüÀÚ ¹ßÇöÀÇ ÀÏÁֱ⠸®µëÀÌ °¢°¢ ƯÀÌÇÔÀ» ¾Ë ¼ö ÀÖ¾úÀ¸¸ç, ¹è¼ö¼º ´Ü¹é SP-B ¿Í SP-C¿¡ ºñÇÏ¿© Ä£¼ö¼º ´Ü¹éÀÎ SP-A¿¡¼­ À¯ÀÇÇÑ À¯ÀüÀÚÀÇ ÀÏÁֱ⠸®µëÀÇ º¯È­°¡ ÀÖÀ½À» ¾Ë ¼ö ÀÖ¾ú´Ù.

Background : All organisms have developed an internal timing system capable of reacting to and anticipating environmental stimuli with a program of appropriately timed metabolic, physiologic, and behavioral events. The alveolar epithelial type II
cell
of mammalian lung synthesizes, stores, and secretes a lipoprotein pulmonary surfactant, which functions to stabilize alveoli at low lung volumes.
Methods : The authors investigated the diurnal variation of surfactant protein A, B and C mRNA accumulation. The diurnal variation on gene expression of surfactant protein A, B and C were analysed using filter hybridization at 9 AM, 4 PM and 11
PM.
Lung
SP-A protein content was determined by double sandwich ELISA assay using a polyclonal antiserum raised in rabbits against purified rat SP-A.
Results : 1. The accumulation of SP-A mRNA at 4 PM was significantly decreased 23.5% compared to the value at 9 AM (p<0.05).
2. The accumulation of SP-B mRNA at 4 PM and 11 PM was decreased by 15.1% and 5.7%, respectively, compared to the value at 9 AM (p=0.07, p=0.69).
3. The accumulation of SP-C mRNA at 4 PM and 11 PM was decreased by 6.8% and 7.7%, respectively, compared to the value at 9 AM (p=0.38, p=0.57).
4. Total lung SP-A content at 4 PM and 11 PM was increased by 5.3% and 15.9%, respectively, compared to the value at 9 AM (p=0.64, p=0.47).
Conclusion : These findings represent diurnal variation of surfactant proteins mRNA expression in vivo. This results suggested the diurnal variation of hydrophilic surfactant protein rather than hydrophobic surfactant proteins.

Å°¿öµå

Gene expression; Surface-active agents; Proteins; Circadian rhythm;

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