The effect of spider toxin PhTx3-4, ω-conotoxins MVIIA and MVIIC on glutamate uptake and on capsaicin-induced glutamate release and [Ca2+]i in spinal cord synaptosomes.

Abstract:

:In spinal cord synaptosomes, the spider toxin PhTx3-4 inhibited capsaicin-stimulated release of glutamate in both calcium-dependent and -independent manners. In contrast, the conus toxins, ω-conotoxin MVIIA and xconotoxin MVIIC, only inhibited calcium-dependent glutamate release. PhTx3-4, but not ω-conotoxin MVIIA or xconotoxin MVIIC, is able to inhibit the uptake of glutamate by synaptosomes, and this inhibition in turn leads to a decrease in the Ca(2+)-independent release of glutamate. No other polypeptide toxin so far described has this effect. PhTx3-4 and ω-conotoxins MVIIC and MVIIA are blockers of voltage-dependent calcium channels, and they significantly inhibited the capsaicin-induced rise of intracellular calcium [Ca(2+)](i) in spinal cord synaptosomes, which likely reflects calcium entry through voltage-gated calcium channels. The inhibition of the calcium-independent glutamate release by PhTx3-4 suggests a potential use of the toxin to block abnormal glutamate release in pathological conditions such as pain.

journal_name

Cell Mol Neurobiol

authors

Gonçaves JM,Ferreira J,Prado MA,Cordeiro MN,Richardson M,Pinheiro AC,Silva MA,Junior CJ,Souza AH,Gomez MV

doi

10.1007/s10571-010-9618-5

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

277-83

issue

2

eissn

0272-4340

issn

1573-6830

journal_volume

31

pub_type

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