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• W2000438657 abstract "The polyamine derivative BsHSPMG (butanesulfonyl-homospermine with guanidine group) was found to inhibit macroscopic currents strongly at heteromeric N-methyl-d-aspartate (NMDA) receptors (NR1/NR2A and NR1/NR2B) and Ca2+-permeable α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (homomeric glutamate receptor 1) receptors expressed in Xenopus laevis oocytes on voltage-clamp recording. The IC50 values of BsHSPMG for NR1/NR2A, NR1/NR2B, NR1/NR2C, and NR1/NR2D receptors were 0.016, 0.021, 5.4, and 9.0 μM, respectively. BsHSPMG inhibited the activity of NR1/NR2A and NR1/NR2B receptors more strongly and did it for those of NR1/NR2C and NR1/NR2D receptors more weakly than a therapeutic drug of Alzheimer's disease, memantine. The inhibition by BsHSPMG was voltage-dependent, since it was prominent at −100 mV compared to that at −20 mV. Mutations including NR1 N616Q, E621Q, N650A, L655A, T807C, NR2B W559L, M562S, W607L, N616Q, and V620E, among others, reduced the inhibition by BsHSPMG, suggesting that BsHSPMG penetrates the channel pore of NMDA receptors deeply. The toxicity of BsHSPMG in neuroblastoma SH-SY5Y cells was much weaker than that of memantine. The effect of BsHSPMG was measured on the focal cerebral ischemia induced by occlusion (1 h) of the middle cerebral artery in mice. BsHSPMG applied before or after occlusion greatly reduced the volume of infarct in mice. These findings demonstrate that BsHSPMG penetrates the NMDA channel pore and exhibits neuroprotective effects against excitatory toxicity in mice." @default.
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• W2000438657 date "2012-01-01" @default.
• W2000438657 modified "2023-09-29" @default.
• W2000438657 title "Antagonism of NMDA receptors by butanesulfonyl-homospermine guanidine and neuroprotective effects in in vitro and in vivo" @default.
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• W2000438657 doi "https://doi.org/10.1016/j.neulet.2011.11.017" @default.
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