Abstract:
:The present experiments investigated the effect of a neurotoxin purified from the venom of the spider Phoneutria nigriventer. This toxic component, P. nigriventer toxin 3-6 (PnTx3-6), abolished Ca(2+)-dependent glutamate release with an IC(50) of 74.4nM but did not alter Ca(2+)-independent secretion of glutamate when brain cortical synaptosomes were depolarized by KCl (33mM). This effect was most likely due to interference with the entry of calcium through voltage activated calcium channels (VACC), reducing the increase in the intrasynaptosomal free calcium induced by membrane depolarization with an IC(50) of 9.5nM. We compared the alterations induced by PnTx3-6 with the actions of toxins known to block calcium channels coupled to exocytosis. Our results indicate that PnTx3-6 inhibition of glutamate release and intrasynaptosomal calcium involves P/Q type calcium channels and this toxin can be a valuable tool in the investigation of calcium channels.
journal_name
Neurochem Intjournal_title
Neurochemistry internationalauthors
Vieira LB,Kushmerick C,Reis HJ,Diniz CR,Cordeiro MN,Prado MA,Kalapothakis E,Romano-Silva MA,Gomez MVdoi
10.1016/s0197-0186(02)00130-4subject
Has Abstractpub_date
2003-03-01 00:00:00pages
277-82issue
4eissn
0197-0186issn
1872-9754pii
S0197018602001304journal_volume
42pub_type
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