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Indoleamine 2,3-dioxygenase 1 activation in mature cDC1 promotes tolerogenic education of inflammatory cDC2 via metabolic communication’ ÀÔ´Ï´Ù.
Conventional dendritic cell (cDC)´Â cDC1°ú cDC2·Î ³ª´µ¸ç °¢°¢ÀÇ subset¿¡ µû¶ó ±â´ÉÀÇ Â÷ÀÌ´Â ÀÖÁö¸¸, local immunosurveillance, migration, antigen processing & presentationÀ» ÅëÇØ innate immunity¿Í adaptive immunity¸¦ ¸Å°³ÇÏ¿© host defense immunity¸¦ Çü¼ºÇÏ°í, naïve lymphocyte¸¦ primingÇÏ´Â ¼¼Æ÷ÀÔ´Ï´Ù.
ÀÌ »Ó¸¸ ¾Æ´Ï¶ó DC´Â self-tolerance¸¦ À¯ÁöÇÏ´Â °ÍÀ» ÅëÇØ immune homeostasis¸¦ Çü¼ºÇÏ´Â µ¥¿¡µµ ±â¿©ÇÏ´Â ¼¼Æ÷·Î¼, ÀÚ°¡¸é¿ªÁúȯ°ú ¾Ë·¯Áö Áúȯ, Ç׿ø¿¡ ´ëÇÑ °ú¹Î¹ÝÀÀ µîÀ» ¾ïÁ¦ÇÏ´Â °ÍÀ¸·Î ¾Ë·ÁÁ® ÀÖ½À´Ï´Ù.
º» ¿¬±¸ÆÀÀº ÀÌ·¸°Ô DC°¡ ¸Å°³ÇÏ´Â ¸é¿ª ¹ÝÀÀ (activation or tolerance)ÀÇ ¿¹ÈÄ°¡ ´Ù¾çÇÑ È¯°æÀû Á¶°Ç¿¡ ÀÇÇؼ º¯ÈÇÒ ¼ö ÀÖÀ½¿¡ ÁßÁ¡À» µÎ¾ú½À´Ï´Ù.
ƯÈ÷ immune tolerance°¡ Çü¼ºµÇ´Â »óȲ, ±×¸®°í À̸¦ ¸Å°³ÇÏ´Â DC¿¡ ÀÖ¾î¼ indoleamine 2,3-dioxygenase 1 (IDO1, Tryptophan (Trp) metabolizing enzyme)°ú tryptophan metaboliteÀÎ kynureninesÀÇ È¿°ú¸¦ È®ÀÎÇÏ¿´½À´Ï´Ù.
¿ì¼± cDC subset¿¡ µû¶ó ¹ßÇöÇÏ´Â IDO1 expression levelÀÌ ´Ù¸£¸ç, cDC1°ú cDC2¸¦ ºÐ¸®ÇÏ¿© ¹è¾çÇÑ È¯°æ¿¡¼ LPS¸¦ ó¸® ½Ã cDC1Àº IDO1 expressionÀÌ Áõ°¡ÇÏÁö¸¸, cDC2¿¡¼´Â ÀÌ·¯ÇÑ Áõ°¡°¡ ³ªÅ¸³ªÁö ¾ÊÀ½À» ¹àÇû½À´Ï´Ù.
±×·¯³ª cDC1°ú cDC2¸¦ ÇÔ²² ¹è¾çÇÑ È¯°æ¿¡¼ LPS¸¦ ó¸® ½Ã¿¡´Â cDC2¿¡¼µµ IDO1ÀÌ ¹ßÇöµÇ°í Tolerogenic functionÀ» º¸ÀÌ´Â °ÍÀ» È®ÀÎÇß½À´Ï´Ù.
ÀÌ·¸°Ô tolerogenic functionÀ» ȹµæÇÑ cDC2´Â delayed-type hypersensitivity (DTH), experimental autoimmune encephalomyelitis (EAE) µîÀÇ Áúº´ ¸ðµ¨ÀÇ Áõ»óÀ» ¿ÏȽÃÅ´À» È®ÀÎÇß½À´Ï´Ù.
±× ¸ÞÄ¿´ÏÁòÀ¸·Î´Â cDC1ÀÌ ¹ßÇöÇÏ°í ÀÖ´Â IDO1À¸·ÎºÎÅÍ »ý»êµÇ´Â Trp metaboliteÀÎ kynureninesÀÌ cDC2 ³» aryl hydrocarbon receptor (AhR)°ú °áÇÕÇÏ¿© Àü»çÀÎÀڷμ ÀÛ¿ëÇÏ°í, °á°úÀûÀ¸·Î IDO1ÀÇ up-regulation, IL-6ÀÇ down-regulationÀ» À¯µµÇÏ´Â ÀÏ·ÃÀÇ Á¶ÀýÀÛ¿ëÀ» ¹àÇû½À´Ï´Ù.
¸¶Áö¸·À¸·Î human sampleÀ» ÅëÇؼµµ ÇØ´ç regulatory pathway°¡ À¯»çÇÏ°Ô Àû¿ëµÊÀ» È®ÀÎÇÏ¿´½À´Ï´Ù.
ÇØ´ç ³í¹®Àº DC tolerogenic functionÀ» Á¶ÀýÇÏ´Â ÀÎÀÚ¿Í experimental disease model µîÀ» °øºÎÇϱâ À§Çؼ ¼±Á¤ÇÏ¿´½À´Ï´Ù.
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