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Effects of Dizocilpine (MK-801) via Up-modulation of N-methyl-D-aspartate (NMDA) Receptors on Hypoxic-Ischemic Brain Injury in Neonatal Rats
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ÀÌÇöÁÖ(Lee Hyun-Ju) - ´ë±¸°¡Å縯´ëÇб³ Àǰú´ëÇÐ ¼Ò¾Æ°úÇб³½Ç
ÀÌÀºÁÖ(Lee Eun-Joo) - ´ë±¸°¡Å縯´ëÇб³ Àǰú´ëÇÐ ¼Ò¾Æ°úÇб³½Ç
ÃÖÀºÁø(Choi Eun-Jin) - ´ë±¸°¡Å縯´ëÇб³ Àǰú´ëÇÐ ¼Ò¾Æ°úÇб³½Ç
±èÁø°æ(Kim Jin-Kyung) - ´ë±¸°¡Å縯´ëÇб³ Àǰú´ëÇÐ ¼Ò¾Æ°úÇб³½Ç
Á¤Çý¸®(Chung Hai-Lee) - ´ë±¸°¡Å縯´ëÇб³ Àǰú´ëÇÐ ¼Ò¾Æ°úÇб³½Ç
±è¿ìÅÃ(Kim Woo-Taek) - ´ë±¸°¡Å縯´ëÇб³ Àǰú´ëÇÐ ¼Ò¾Æ°úÇб³½Ç
Abstract
¸ñÀû : ÃÖ±Ù N-methyl-D-aspartate (NMDA) ¼ö¿ëü ±æÇ×Á¦ÀÎ dizocilpine (MK-801)´Â Àú»ê¼Ò¼º ÇãÇ÷¼º ³ú¼Õ»ó¿¡¼ ½Å°æ º¸È£ È¿°ú°¡ ÀÖ´Ù°í ¹ßÇ¥µÇ°í ÀÖÁö¸¸ ½Å»ý¾Æ±â Àú»ê¼Ò¼º ÇãÇ÷¼º ³úº´ÁõÀÇ Ä¡·áÁ¦·Î¼ ±× ±âÀüÀÌ ¸íÈ®ÇÏ°Ô ¹àÇôÁöÁö ¾Ê¾Ò´Ù. ÀúÀÚµéÀº dizocilpineÀ» ÀÌ¿ëÇÏ¿© ÁÖ»ê±â Àú»ê¼Ò¼º ÇãÇ÷¼º ³úº´ÁõÀÇ Ä¡·áÁ¦·Î¼ NMDA ¼ö¿ëü Á¶ÀýÀ» ÅëÇÑ ±âÀüÀ» ¾Ë¾Æº¸°íÀÚ ÇÏ¿´´Ù.
¹æ¹ý : »ýü³» ½ÇÇèÀ¸·Î Àú»ê¼Ò¼º ÇãÇ÷¼º ³úº´ÁõÀÇ µ¿¹° ¸ðµ¨¿¡¼´Â »ýÈÄ 7ÀÏµÈ ½Å»ý ¹é¼ÀÇ ÁÂÃø ÃÑ °æµ¿¸ÆÀ» °áÂûÇÑ ÈÄ 6°³ ±º(Á¤»ó »ê¼Ò±º, ¼ö¼ú ¾øÀÌ Àú»ê¼Ò±º, sham ¼ö¼ú ÈÄ Àú»ê¼Ò±º, ¼ö¼ú ÈÄ Àú»ê¼Ò±º, vehicle Åõ¿© ÈÄ Àú»ê¼Ò±º, dizocilpine Åõ¿© ÈÄ Àú»ê¼Ò±º)À¸·Î ³ª´©¾ú°í, dizocilpineÀº ³ú¼Õ»ó Àü 30ºÐ¿¡ üÁß kg´ç 10 mg¸¦ Åõ¿©ÇÏ¿´À¸¸ç, Àú»ê¼Ò ¼Õ»óÀº Ưº°È÷ Á¦ÀÛÇÑ Åë¼Ó¿¡¼ 2½Ã°£ µ¿¾È 8% O2¿¡ ³ëÃâ½ÃÄ×´Ù. »ýü ¿Ü ½ÇÇèÀ¸·Î ÀçÅ ±â°£ 18ÀÏµÈ ÅÂ¾Æ ¹é¼ÀÇ ´ë³úÇÇÁú ¼¼Æ÷¸¦ ¹è¾çÇÏ¿© Á¤»ó »ê¼Ò±ºÀº 5% CO2 ¹è¾ç±â(95% air, 5% CO2)¿¡ µÎ¾ú°í, Àú»ê¼Ò±º°ú ³ú¼Õ»ó Àü dizocilpine Åõ¿©±º(10 ¥ìg/mL)Àº 1% O2 ¹è¾ç±â(94% N2, 5% CO2)¿¡¼ 16½Ã°£ µ¿¾È ³ú¼¼Æ÷¼Õ»óÀ» À¯µµÇÏ¿´´Ù. ¼¼Æ÷ÀÇ viability¸¦ È®ÀÎÇϱâ À§ÇÏ¿© MTT assay¸¦ ½Ç½ÃÇÏ¿´´Ù. »ýü ³»¡¤¿Ü ½ÇÇè ¸ðµÎ NMDA ¼ö¿ëüÀÇ ¾Æ´ÜÀ§ÀÎ NR1, NR2A, NR2B, NR2C, NR2D primer¸¦ ÀÌ¿ëÇÏ¿© ½Ç½Ã°£ ÁßÇÕÈ¿¼Ò¿¬¼â¹ÝÀÀÀ» ½Ç½ÃÇÏ¿´°í, ¶ÇÇÑ NMDA ¼ö¿ëüÀÇ ¾Æ´ÜÀ§ Ç×ü(NR2A, NR2B)¸¦ ÀÌ¿ëÇÏ¿© western blottingÀ» ½ÃÇàÇÏ¿´´Ù.
°á°ú : »ýü ³»¡¤¿Ü ½ÇÇè¿¡¼ NMDA ¼ö¿ëü ¾Æ´ÜÀ§ÀÇ ¹ßÇöÀº Á¤»ó »ê¼Ò±ºº¸´Ù Àú»ê¼Ò±º¿¡¼ °¨¼ÒÇÏ¿´Áö¸¸ dizocilpine Åõ¿©±º¿¡¼´Â Àú»ê¼Ò±ºº¸´Ù ¸ðµÎ Áõ°¡ÇÏ¿´´Ù. ÇÏÁö¸¸ »ýü ¿Ü ½ÇÇè¿¡¼ NR1, NR2A mRNA¿¡¼´Â Á¤»ó »ê¼Ò±º º¸´Ù Àú»ê¼Ò±º¿¡¼´Â °¨¼ÒÇÏ¿´Áö¸¸ dizocilpine¿¡¼´Â Àú»ê¼Ò±ºº¸´Ù ¾ÆÁÖ Àû°Ô Áõ°¡ÇÏ¿´´Ù.
°á·Ð : º» ¿¬±¸¿¡¼ dizocilpineÀº Àú»ê¼Ò¼º ÇãÇ÷¼º ³ú¼Õ»ó ¸ðµ¨¿¡¼ NMDA ¼ö¿ëü¸¦ Á¶ÀýÇÏ´Â È¿°ú°¡ ÀÖÀ½À» ¾Ë ¼ö ÀÖ¾ú´Ù.
Objective : Several studies have demonstrated the neuroprotective effects of (+)-MK-801 hydrogen maleate (dizocilpine), in various animal models of hypoxic-ischemic (HI) brain injury. However limited data are availableon the neonatal model of HI brain injury. The aim of the present study was to investigate the effects of dizocilpine and its mechanisms associated with NMDARs expression in neonatal rat model of HI brain injury.
Methods : In in vivo model, 7d-old rat pups underwent permanent unilateral carotid ligation. The animals were divided into six groups: N, normoxia; H, hypoxia without operation; HS, hypoxia with Sham operation; HO, hypoxia with operation; HV, HO treated with vehicle; HD, HO treated with dizocilpine. Dizocilpine (10 mg/kg) was administered intracerebrally to the rats 30 min before HI brain injury. Rat pups were exposed to hypoxia by placing them for 2 hours in hypoxic incubator (92% N2, 8% O2). In in vitro model, embryonic cortical neuronal cell cultures (from SD rats of embryonic days of 18) were done. The normoxia (N) group was prepared in 5% CO2 incubators. The hypoxia (H), and hypoxia treated with dizocilpine (HD) groups were placed in 1% O2 incubators (94% N2, 5% CO2) for 16 hours. In order to estimation of cell viability and growth, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (MTT) assay was done. The degree of neuronal death was evaluated by morphometric method and the protein expression of each NMDARs was quantified by Real Time-PCR and Western blot.
Results : Both in the in vitro and in vivo models, the expressions of NMDAR subunits were lower in the hypoxia group than in the normoxia group, whereas they increased in the hypoxia treated with dizocilpine group comparedto the hypoxia group. In vitro model, however, the expressions of NR1, NR2A mRNAs decreased in the H group when compared to the N group, whereas they increased a little in the HD group when compared to the H group.
Conclusion : Dizocilpine was modulated the degeneration of neuronal cell death in neonatal rat model of HI by preservation of NR expression.
Ű¿öµå
Dizocilpine, NMDAR, Glutamate receptor, Hypoxic-ischemic brain injury, Modulation
KMID :
0361720140250030166
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