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The Phoneutria nigriventer spider toxin, PnTx4-5-5, promotes neuronal survival by blocking NMDA receptors.
- Source :
-
Toxicon . Mar2016, Vol. 112, p16-21. 6p. - Publication Year :
- 2016
-
Abstract
- Spider toxins are recognized as useful sources of bioactive substances, showing a wide range of pharmacological effects on neurotransmission. Several spider toxins have been identified biochemically and some of them are specific glutamate receptors antagonists. Previous data indicate that PnTx4-5-5, a toxin isolated from the spider Phoneutria nigriventer , inhibits the N-methyl- d -aspartate receptor (NMDAR), with little or no effect on AMPA, kainate or GABA receptors. In agreement with these results, our findings in this study show that PnTx4-5-5 reduces the amplitude of NMDAR-mediated EPSCs in hippocampal slices. It is well established that glutamate-mediated excitotoxic neuronal cell death occurs mainly via NMDAR activation. Thus, we decided to investigate whether PnTx4-5-5 would protect against various cell death insults. For that, we used primary-cultured corticostriatal neurons from wild type (WT) mice, as well as from a mouse model of Huntington's disease, BACHD. Our results showed that PnTx4-5-5 promotes neuroprotection of WT and BACHD neurons under the insult of high levels of glutamate. Moreover, the toxin is also able to protect WT neurons against amyloid β (Aβ) peptide toxicity. These results indicate that the toxin PnTx4-5-5 is a potential neuroprotective drug. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00410101
- Volume :
- 112
- Database :
- Academic Search Index
- Journal :
- Toxicon
- Publication Type :
- Academic Journal
- Accession number :
- 113187960
- Full Text :
- https://doi.org/10.1016/j.toxicon.2016.01.056