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• W2065002316 endingPage "737" @default.
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• W2065002316 abstract "Conventional N-methyl-D-aspartate (NMDA) receptor (NMDAR) is a heteromeric complex between the essential NR1 subunit and one of NR2A-D subunits toward functional channels permeable to Ca(2+) rather than Na(+) ions. Although recent studies identified dominant negative NR3A and NR3B subunits, whether these subunits inhibit Ca(2+) mobilization through NMDAR channels into mitochondria is not clarified so far. In this study, we investigated Ca(2+) influx across acquired NMDAR channels composed of different NR subunits artificially expressed in HEK293 cells. The addition of NMDA markedly increased intracellular free Ca(2+) levels determined by Fluo-3 in cells transfected with either NR2A or NR2B subunit together with NR1 subunit. Further addition of dizocilpine completely inhibited the increase by NMDA in both types of acquired channels, while the NR2B subunit selective antagonist ifenprodil drastically inhibited the increase by NMDA in cells expressing NR1/NR2B, but not NR1/NR2A, subunits. Similar pharmacological profiles were invariably seen with cell death by NMDA. Introduction of both NR3A and NR3B subunits significantly inhibited the increase by NMDA in intracellular free Ca(2+) levels in both acquired channels, while introduction of either NR3A or NR3B alone was ineffective. Co-expression of both NR3A and NR3B subunits was also required for the prevention of increased mitochondrial free Ca(2+) levels determined by Rhod-2, as well as decreased cellular viability, in cells expressing NR1/NR2A or NR1/NR2B subunits upon exposure to NMDA. These results suggest that co-expression of both NR3A and NR3B subunits is essential for the dominant negative properties on Ca(2+) mobilization through acquired functional NMDAR channels into mitochondria." @default.
• W2065002316 created "2016-06-24" @default.
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• W2065002316 date "2010-12-01" @default.
• W2065002316 modified "2023-09-25" @default.
• W2065002316 title "Requirement of both NR3A and NR3B subunits for dominant negative properties on Ca2+ mobilization mediated by acquired N-methyl-d-aspartate receptor channels into mitochondria" @default.
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• W2065002316 doi "https://doi.org/10.1016/j.neuint.2010.08.009" @default.
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