KIST ºÐÀÚ¼¼Æ÷ ½Å°æ»ý¹°ÇÐ ½ÇÇè½ÇÀº 2018³â 3¿ù¿¡ ½ÃÀÛÇÑ ½Å»ý ½ÇÇè½Ç·Î ¼¿ï KIST ³ú°úÇבּ¸¼Ò¿¡ ¼ÓÇØ ÀÖ½À´Ï´Ù. KIST´Â 1966³â¿¡ ¼¼¿öÁø ´ëÇѹα¹ ÃÖÃÊÀÇ Á¤ºÎÃ⿬¿¬±¸¼Ò·Î¼ ¹ÝµµÃ¼, ·Îº¿, ÀÇ°øÇÐ, ³ú°úÇÐ, ¿¡³ÊÁö µî ´Ù¾çÇÑ ºÐ¾ßÀÇ Á¾ÇÕ ¿¬±¸¸¦ ¼öÇàÇÏ°í ÀÖ½À´Ï´Ù. ÀúÈñ KIST ³ú°úÇבּ¸¼Ò¿¡´Â ½Å°æȸ·Î, ÀÎÁö ¹× ¿îµ¿±â´É, ÅðÇ༺ ½Å°æÁúȯ, ¾à¹° °³¹ß, ¸¶ÀÌÅ©·Î ¿£Áö´Ï¾î¸µ µî ´Ù¾çÇÑ ¹è°æÀ» °¡Áø ¿¬±¸ÀںеéÀÌ ¸ð¿© ¼¼°èÀûÀ¸·Î °æÀï·ÂÀÖ´Â ¿¬±¸µéÀ» ÁøÇàÇÏ°í ÀÖ½À´Ï´Ù. ƯÈ÷ Á¦°¡ ¼ÓÇÑ ±â´ÉÄ¿³ØÅä¹Í½º¿¬±¸´ÜÀÇ °æ¿ì, ¹Ì±¹, ÀϺ», Áß±¹, ij³ª´Ù µî ´Ù¾çÇÑ ±¹ÀûÀ» °¡Áø Principal Investigator (PI)ºÐµéÀÌ °è¼Å¼ ÀÚÀ¯·Î¿î ºÐÀ§±âÀÇ ¿¬±¸È¯°æÀ» °¡Áö°í ÀÖ½À´Ï´Ù.
ÀúÈñ ½ÇÇè½Ç(https://kwonlab.wixsite.com/mysite/)¿¡¼´Â ½Å°æ¼¼Æ÷¿¡¼ÀÇ ¼¼Æ÷³» ¼Ò±â°üÀÌ Ä®½· Á¶ÀýÀ» ÅëÇØ ½Ã³À½º¿¡ ¾î¶°ÇÑ ¿µÇâÀ» ÁÖ´ÂÁö¸¦ ´Ù¾çÇÑ ½ÇÇè ¹æ¹ýÀ» ÅëÇØ ±Ô¸íÇÏ°íÀÚ ÇÏ°í ÀÖÀ¸¸ç, ÇöÀç ¹Ú»ç ÈÄ ¿¬±¸¿ø 1¸í, ¼®»ç°úÁ¤ Çлý 1¸í, ÀÎÅÏ¿¬±¸¿ø 1¸í°ú ÇÔ²² ¿¬±¸¸¦ ÁøÇà ÁßÀÔ´Ï´Ù. Àç¹Õ´Â ÁÖÁ¦¿¡ ´ëÇÑ Å½±¸¸¦ ´õ ¸¹Àº ºÐµé°ú ÇÔ²²Çϱâ À§ÇØ ¼®»ç ¹× ¹Ú»ç°úÁ¤ Çлý, Æ÷½º´ÚºÐµéÀ» ã°í ÀÖÀ¸´Ï °ü½ÉÀÖÀ¸½Å ºÐµéÀº ¾ðÁ¦µç ¿¬¶ôÁÖ¼¼¿ä.
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¿ì¸® ¸öÀÇ ±â´ÉÀÌ ½ÉÀå, °£, ³ú¿Í °°Àº ´Ù¾çÇÑ ±â°ü(organ)µé¿¡ ÀÇÇØ Á¶ÀýÀÌ µÇµíÀÌ °¢°¢ÀÇ ¼¼Æ÷µéµµ ¿©·¯°¡Áö ¼¼Æ÷³» ¼Ò±â°ü(intracellular organelle)µé¿¡ ÀÇÇØ ±â´ÉÀÌ Á¶À²µË´Ï´Ù. ½Å°æ¼¼Æ÷¿¡µµ ÀÌ·¯ÇÑ ¼¼Æ÷³» ¼Ò±â°üµéÀÌ Á¸ÀçÇÏ°í ÀÖÀ¸¸ç, ƯÈ÷ À̵é Áß ¿¡³ÊÁö »ý»ê, Áï ATP »ý»ê¿¡ °ü¿©ÇÑ´Ù ¾Ë·ÁÁø mitochondria (¸¶ÀÌÅäÄܵ帮¾Æ)¿Í ´Ü¹éÁú ÇÕ¼º µî¿¡ °ü¿©ÇÏ´Â endoplasmic reticulum (ER, ¼ÒÆ÷ü)ÀÌ Å« º¼·ýÀ» Â÷ÁöÇÏ°í ÀÖ½À´Ï´Ù. ÀÌµé ¼Ò±â°üÀº ¼¼Æ÷³» Ä®½·À» Èí¼öÇϰųª ³»º¸³¿À¸·Î½á ³óµµ¸¦ Á¶ÀýÇÒ ¼ö Àִµ¥ ÀÌ·¯ÇÑ Ä®½· ³óµµ´Â ½Å°æ¼¼Æ÷ ±â´É¿¡ ±²ÀåÈ÷ Áß¿äÇÑ ±â´ÉÀ» ÇÏ°í ÀÖ½À´Ï´Ù. ÀÌ¿¡ ´õÇØ ER°ú mitochondria´Â ¼·Î ±¸Á¶ÀûÀ¸·Î ¿¬°áµÇ¾î mitochondria-ER contacts (MERCs) ȤÀº mitochondria-associated ER membrane (MAM)À̶ó ºÒ¸®¿ì´Â ±¸Á¶¸¦ Çü¼ºÇϴµ¥ ÀÌ´Â ÁöÁú(lipid) ÇÕ¼º, mitochondria ¸ð¾ç Á¶Àý ¹× Ä®½· À̵¿ µî¿¡ °ü¿©ÇÑ´Ù°í ¾Ë·ÁÁ® ÀÖ½À´Ï´Ù[1-3]. ÀÌ·¯ÇÑ ¿¬°áÀº ¿©·¯ ½Å°æÅðÇ༺ Áúȯ¿¡µµ ¿¬°üµÇ¾î ÀÖÀ½ÀÌ Áö¼ÓÀûÀ¸·Î º¸°í µÇ°í ÀÖÁö¸¸ ¾ÆÁ÷ ½Å°æ¼¼Æ÷¿¡¼ ÀÌµé ¼Ò±â°üÀÇ Ä®½· Á¶ÀýÀÌ ½Ã³À½º ±â´É¿¡ ¹ÌÄ¡´Â ¿µÇâ¿¡ ´ëÇÑ ¿¬±¸´Â ±â¼úÀûÀÎ ÇÑ°è·Î ¸¹ÀÌ ÁøÇàµÇÁö ¾Ê¾Æ ÀúÈñ ¿¬±¸½Ç¿¡¼´Â ÀÌ·¯ÇÑ ¼Ò±â°üµéÀÇ ½Ã³À½º¿¡¼ÀÇ ¿ªÇÒÀ» È°¹ßÈ÷ ¿¬±¸ÇÏ°í ÀÖ½À´Ï´Ù.
½Å°æ¼¼Æ÷´Â ½ÅÈ£¸¦ ÁÖ´Â axon (Ãà»èµ¹±â)¿Í ½ÅÈ£¸¦ ¹Þ´Â dendrite (¼ö»óµ¹±â)°¡ cell body (¼¼Æ÷ü)·ÎºÎÅÍ °¡Áö ¸ð¾çÀ¸·Î »¸¾î³ª¿Â µ¶Æ¯ÇÑ polarized structure¸¦ °¡Áö°í ÀÖ½À´Ï´Ù. ÀÌ¿¡ ´õÇØ ¼¼Æ÷³» ¼Ò±â°ü ¶ÇÇÑ axon°ú dendrite¿¡¼ ¿ÏÀüÈ÷ ´Ù¸¥ ¸ð¾çÀ» º¸¿©ÁÝ´Ï´Ù (±×¸² 1). Axon¿¡¼ÀÇ mitochondria´Â ÀÛ°í µÕ±Ù ¸ð¾çÀ» ÇÏ°í ÀÖÀ¸¸ç, dendrite¿¡¼´Â ±ä Æ©ºê¸ð¾çÀ» ÇÏ°í ÀÖ½À´Ï´Ù. ÀÌ·¯ÇÑ mitochondriaÀÇ ¸ð¾çÀº fusion°ú fission¿¡ ÀÇÇؼ Á¶ÀýµÉ ¼ö Àִµ¥¿ä, ¾ËÃ÷ÇÏÀ̸ӳª ÆÄŲ½¼ µî ÅðÇ༺ ½Å°æÁúȯ¿¡¼ mitochondria°¡ ÀÛ°Ô ÂÉ°³Áø ¸ð¾çµé·Î Á¸ÀçÇÏ´Â °ÍÀÌ °üÂûµÇ¾î ¿Ô½À´Ï´Ù[4-6]. ÇÏÁö¸¸ ÀÌµé ¸ð¾çÀÌ Á¤»óÀûÀÎ Á¶°Ç¿¡¼ ¾î¶»°Ô À¯ÁöµÇ´ÂÁö¿¡ ´ëÇÑ ¿¬±¸´Â ºÎÁ·Çß¾ú½À´Ï´Ù.
ÀúÈñ ½ÇÇè½Ç¿¡¼´Â dendrite¿¡¼ ±æ°í axon¿¡¼± ÀÛÀº mitochondria ¸ð¾ç¿¡ ±Ù°ÅÇÏ¿© dendrite¿¡¼´Â mitochondrial fusionÀÌ axon¿¡¼´Â mitochondrial fissionÀÌ dominantÇÏ´Ù´Â °¡¼³À» ¼¼¿ì°í ¿¬±¸¸¦ ÁøÇàÇß½À´Ï´Ù. À̸¦ À§ÇØ mitochondrial fission°ú °ü·ÃÇÑ ´Ü¹éÁú Áß ½Å°æ¼¼Æ÷¿¡ ¸¹Àº MFF¸¦ Ÿ°ÙÀ¸·Î »ï¾Æ ¸ÕÀú knockdownÀ» ÁøÇàÇØ º¸¾Ò½À´Ï´Ù. ³î¶ø°Ôµµ dendriteÀÇ mitochondria ¸ð¾çÀº º¯È°¡ ¾ø¾úÁö¸¸ axonal mitochondria°¡ ±æ¾îÁø °ÍÀ» °üÂûÇÏ¿´½À´Ï´Ù±×¸² 2A-B)[7]. ÀÌ·¯ÇÑ ¸ð¾ç º¯È°¡ ¾î¶°ÇÑ °á°ú¸¦ °¡Á®¿À´ÂÁö¸¦ ÀÌÇØÇÏ¸é ¿Ö mitochondria°¡ axon ƯÈ÷ presynapse (Àü½Ã³À½º)¿¡¼ ÀÛ°Ô À¯Áö°¡ µÇ¾î¾ßÇÏ´ÂÁö¸¦ ÀÌÇØÇÒ ¼ö ÀÖÀ» °ÍÀ̶ó »ý°¢ÇØ ´ÙÀ½ ¿¬±¸¸¦ ÁøÇàÇÏ¿´½À´Ï´Ù.
±âÁ¸ ¿¬±¸µé¿¡¼ ³ú¿¡ Á¸ÀçÇÏ´Â ¸¹Àº ½Å°æ¼¼Æ÷µéÀÌ ÇϳªÀÇ axon¿¡ ¿©·¯ °³ÀÇ presynaptic release site¸¦ °®°í ÀÖ´Â °ÍÀÌ ¾Ë·ÁÁ³À¸¸ç, Èï¹Ì·Ó°Ôµµ 50% ÀÌÇÏÀÇ presynaptic site¸¸ mitochondria¿Í °ãÃÄÀÖ´Â °ÍÀÌ °üÂûµÆ½À´Ï´Ù. Presynapse¿¡¼ action potential¿¡ µû¸¥ Ca2+ influx°¡ presynaptic vesicle exocytosis¸¦ À¯µµÇÏ°Ô µÇ´Âµ¥ À§¿Í °°Àº mitochondriaÀÇ Á¸Àç À¯¹«°¡ Ca2+ uptake¸¦ ÅëÇØ release Â÷À̸¦ ÁÙ ¼ö ÀÖ´ÂÁö´Â Àǹ®À̾ú½À´Ï´Ù. °¢ presynapseÀÇ release¸¦ À̹Ì¡ ±â¼úÀ» ÅëÇØ »ìÆ캸¾ÒÀ» ¶§, ³î¶ø°Ôµµ mitochondria°¡ ¾ø´Â °÷¿¡¼ presynaptic Ca2+°ú release°¡ ´õ ¿Ã¶ó°¡ ÀÖÀ½ÀÌ º¸¿©Á³½À´Ï´Ù[8].
Mff knockdown neuron¿¡¼´Â ±æ¾îÁø presynaptic mitochondria°¡ Ca2+ÀÇ over-uptake¸¦ À¯µµÇÏ°í ÀÌ·Î ÀÎÇØ presynaptic release°¡ ÁÙ¾îµå´Â °ÍÀÌ °üÂûµÇ¾ú½À´Ï´Ù(±×¸² 2C). ¶ÇÇÑ synaptic activity¿¡ Å« ¿µÇâÀ» ¹Þ´Â axon branchingÀÌ ÇöÀúÈ÷ ÁÙ¾îµé°Ô ÇÏ´Â °á°ú¸¦ °¡Á®¿Ô½À´Ï´Ù. µû¶ó¼ presynaptic mitochondria¿¡ ÀÇÇÑ Ca2+ Á¶ÀýÀÌ synaptic release property ¹× axon branching development¿¡ ±²ÀåÈ÷ Áß¿äÇϸç, presynapseÀÇ mitochondrial size¸¦ ÀÛ°Ô À¯ÁöÇÏ´Â °ÍÀÌ Á¤»óÀûÀÎ presynaptic function¿¡ ÇʼöÀûÀÓÀ» ¾Ë ¼ö ÀÖ¾ú½À´Ï´Ù(±×¸² 2D)[7].
¾Õ¼ ¾ð±ÞÇÑ ¹Ù¿Í °°ÀÌ ºñ½Å°æ¼¼Æ÷¿¡¼ mitochondria-ER contactÀÇ ´Ù¾çÇÑ ±â´ÉµéÀÌ º¸°í µÇ¾î¿Ô½À´Ï´Ù. Mitochondria¿Í ERÀº ¸ðµÎ Ca2+À» Èí¼öÇÏ°í ¹æÃâÇÏ´Â ±â´ÉÀ» Çϴµ¥ mitochondrial calcium uniporter (MCU)ÀÇ °æ¿ì Ca2+ affinity°¡ ³·¾Æ ER¿¡¼ ¹æÃâµÈ Ca2+ÀÌ ER-mitochondria ¿¬°áÀ» ÅëÇØ Àü´ÞÀÌ µÉ ¶§ ä³ÎÀÌ ¿¸®¸é¼ mitochondria·ÎÀÇ Èí¼ö°¡ ÀÌ·ç¾îÁú ¼ö ÀÖ´Ù´Â º¸°íµéÀÌ ÀÖ¾ú½À´Ï´Ù[9, 10]. ÇÏÁö¸¸ ÀÌ°ÍÀÇ Á÷Á¢ÀûÀÎ °üÂûÀº ÃÖ±Ù¿¡ µé¾î¼¾ß »õ·Î¿î sensor °³¹ß·Î °¡´ÉÇÏ°Ô µÇ¾ú½À´Ï´Ù. »ì¾ÆÀÖ´Â ¼¼Æ÷³»ÀÇ Ca2+ dynamics¸¦ º¸±â À§ÇØ ´Ù¾çÇÑ chemical ȤÀº genetic Ca2+ sensorµéÀÌ °³¹ßµÇ¾ú°í, ƯÈ÷ ÀûÀº ¾çÀÇ Ca2+¿¡ ´ëÇÑ ¹Î°¨µµ(sensitivity)¸¦ ¿Ã¸®±â À§ÇØ À̵éÀÇ Ca2+ affinity´Â ³ô¾ÆÁö´Â ¹æÇâÀ¸·Î ÁøÇàµÇ¾úÁö¸¸ ERÀÇ resting Ca2+ ³óµµÀÇ °æ¿ì 1mM¿¡ À̸¦ Á¤µµ·Î ³ô¾Æ ±âÁ¸ÀÇ Ca2+ sensor·Î ÃøÁ¤Çϱ⿡´Â saturationÀ¸·Î ÀÎÇÑ ÇÑ°è°¡ ÀÖ¾ú½À´Ï´Ù. µû¶ó¼ ÃÖ±Ù ERÀÇ Ca2+ dynamics¸¦ ÃøÁ¤Çϱâ À§ÇØ affinity°¡ ³·Àº ER-targeted genetically-encoded Ca2+ sensorµéÀÌ °³¹ßµÇ¾ú½À´Ï´Ù[11, 12].
½Å°æ¼¼Æ÷¿¡¼ Ca2+Àº ½Ã³À½ºÀÇ ±â´É Á¶Àý, Àü»ç Á¶Àý µî ´Ù¾çÇÑ ¿ªÇÒÀ» ÇÏ°í ÀÖÀ¸¸ç, ER¿¡¼ÀÇ Ca2+ ¹æÃâÀÌ ½Ã³À½º Àڱؽÿ¡ ÀϾٴ º¸°í°¡ ÀÖ¾úÀ¸³ª mitochondria¿ÍÀÇ »óÈ£ÀÛ¿ë¿¡ ´ëÇؼ´Â ¾Ë·ÁÁ® ÀÖÁö ¾Ê¾Ò½À´Ï´Ù[13-17]. ÀúÈñ´Â ÃÖ±Ù ¿¬±¸¿¡¼ óÀ½À¸·Î ½Å°æ¼¼Æ÷¿¡¼ ER°ú mitochondriaÀÇ Ca2+ dynamics¸¦ »õ·ÎÀÌ °³¹ßµÈ ´Ù¸¥ ÆÄÀåÀÇ Çü±¤À» ³»´Â genetically-encoded Ca2+ sensor (G-CEPIA1er for green, mito-RCaMP1h for red)¸¦ ÅëÇØ µ¿½Ã¿¡ ÃøÁ¤ÇÏ¿´½À´Ï´Ù. Èï¹Ì·Ó°Ôµµ ´Ù¸¥ ¼¼Æ÷¿Í °°ÀÌ ½Å°æ¼¼Æ÷ÀÇ dendrite (¼ö»óµ¹±â)¿¡¼ mitochondriaÀÇ Ca2+ Èí¼ö°¡ ER¿¡¼ÀÇ Ca2+ ¹æÃâ¿¡ ÀÇÁ¸ÇÑ´Ù´Â °ÍÀ» ¹ß°ßÇÏ¿´°í, ER-mitochondria contact¿¡ °ü¿©ÇÏ´Â PDZD8À̶ó´Â ´Ü¹éÁúµµ »õ·Î ã¾Æ, PDZD8 knockdown Á¶°Ç¿¡¼´Â ÀÌ·¯ÇÑ Ca2+ À̵¿ÀÌ ÀúÇصǾî ÀÖÀ½À» °üÂûÇÏ¿´½À´Ï´Ù(±×¸² 3). ÀÌ´Â ½Å°æ¼¼Æ÷ÀÇ ER¿¡¼ mitochondria·ÎÀÇ Ca2+À̵¿ ¹× °ü·Ã ´Ü¹éÁúÀ» óÀ½À¸·Î º¸¿©ÁØ ¿¬±¸¶ó ÇÒ ¼ö ÀÖ°Ú½À´Ï´Ù. ÀÌ¿¡´õÇØ cytosolic Ca2+ Áõ°¡°¡ º¸¿©Á® ER¿¡¼ ¹æÃâµÈ Ca2+ÀÌ mitochondria·Î °¡Áö ¸øÇÒ °æ¿ì cytosol·Î »õ¾î³ª°¨À» ¾Ë ¼ö ÀÖ¾ú½À´Ï´Ù±×¸² 3)[18]. ÀÌ ¿¬±¸´Â ÇâÈÄ dendrite¿¡¼ Ca2+ Á¶Àý ¸ÞÄ¿´ÏÁòÀ» ÀÌÇØÇϴµ¥ ER-mitochondria contactÀÌ ¹Ýµå½Ã °í·ÁµÇ¾î¾ß ÇÔÀ» Á¦½ÃÇØ ÁÖ°í ÀÖ½À´Ï´Ù.
ÀÌ·¯ÇÑ ¿¬±¸µéÀ» ¹ÙÅÁÀ¸·Î ÀúÈñ ½ÇÇè½Ç¿¡¼´Â axon°ú dendrite¿¡¼ ER°ú mitochondriaÀÇ »óÈ£ÀÛ¿ë¿¡ ÀÇÇÑ ½Ã³À½º °¡¼Ò¼º ¿µÇâ ¹× ½Å°æȸ·Î¿¡ µû¸¥ ¼Ò±â°üÀÇ ¿µÇâ¿¡ ´ëÇؼ ´Ù¾çÇÑ ºÐÀÚ/¼¼Æ÷ »ý¹°ÇÐÀûÀÎ ±â¼úÀ» ÅëÇØ in vitro¿Í in vivo¿¡¼ ¿¬±¸¸¦ ÁøÇàÇÏ°í ÀÖ½À´Ï´Ù. ÀÌ·¯ÇÑ ¿¬±¸µéÀº ±³°ú¼¿¡ »õ·Î¿î ³»¿ëÀ» ´õÇØÁÙ °ÍÀ̶ó »ý°¢Çϸç, ÇâÈÄ ÅðÇ༺ ½Å°æÁúȯÀÇ º´¸®Àû Ư¼ºÀ» ¹àÈ÷´Âµ¥ ÇÙ½É ¿ä¼Ò·Î Àû¿ëµÉ °ÍÀÔ´Ï´Ù.
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KAIST, Çлç
KAIST, ¹Ú»ç
The Scripps Research Institute, La Jolla, postdoc
Columbia University, postdoc
KIST ³ú°úÇבּ¸¼Ò ±â´ÉÄ¿³ØÅä¹Í½º¿¬±¸´Ü, ¼±ÀÓ¿¬±¸¿ø