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Attenuation of Zn 2+ neurotoxicity by aspirin: Role of N-type Ca 2+ channel and the carboxyl acid group
- Attenuation of Zn 2+ neurotoxicity by aspirin: Role of N-type Ca 2+ channel and the carboxyl acid group
- Young Kim E.; Chang S.-Y.; Chung J.-M.; Rum Ryu B.; Joo C.-K.; Moon H.-S.; Kang K.; Yoon S.-H.; Han P.-L.; Joo Gwag B.
- Ewha Authors
- 정준모; 한평림
- SCOPUS Author ID
- 정준모; 한평림
- Issue Date
- Journal Title
- Neurobiology of Disease
- vol. 8, no. 5, pp. 774 - 783
- SCI; SCIE; SCOPUS
- Synaptically released Zn 2+ ions enter into neurons primarily through voltage-gated Ca 2+ channels (VGCC) or N-methyl-D-aspartate (NMDA) receptors, which can mediate pathological neuronal death. We studied the possibility (and underlying mechanisms) that aspirin, known to prevent NMDA neurotoxicity, would also attenuate Zn 2+ neurotoxicity. Administration of 3 to 10 mM aspirin, in cortical cell cultures, attenuated the evolution of neuronal death following exposure to 300 μM Zn 2+ for 30 min. This neuroprotective effect of aspirin was attributable to the prevention of Zn 2+ ion entry. Aspirin interfered with inward currents and an increase in [Ca 2+] i through VGCC and selective binding of ω-conotoxin, sensitive to N-type Ca 2+ channel. The ω-conotoxins GVIA or MVIIC, the selective inhibitors of N-type Ca 2+ channels, attenuated Zn 2+ neurotoxicity. Aspirin derivatives lacking the carboxyl acid group did not reduce Zn 2+ neurotoxicity. The present findings suggest that aspirin prevents Zn 2+-mediated neuronal death by interfering with VGCC, and its action specifically requires the carboxyl acid group. © 2001 Academic Press.
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