Taipoxin induces synaptic vesicle exocytosis and disrupts the interaction of synaptophysin I with VAMP2.
The application of the snake neurotoxin taipoxin to hippocampal neurons in culture induced Ca(2+)-dependent synaptic vesicle (SV) exocytosis, with swelling of nerve terminals and redistribution of SV proteins to the axolemma. Using digital imaging videomicroscopy to measure fluorescence resonance energy transfer in live neurons, we also found that taipoxin modulates the machinery for neurosecretion by causing dissociation of the SV proteins synaptobrevin 2 and synaptophysin I at a stage preceding taipoxin-induced facilitation of SV fusion. These early effects of the toxin are followed by severe impairment of SV exo-endocytosis, which might underlie the prevention of neurotransmitter release reported after intoxication by taipoxin.
Bonanomi
Dario
D
Department of Neuroscience, San Raffaele Scientific Institute, via Olgettina 58, 20132 Milan, Italy.
Pennuto
Maria
M
Rigoni
Michela
M
Rossetto
Ornella
O
Montecucco
Cesare
C
Valtorta
Flavia
F
D000818:Animals; D002478:Cells, Cultured; D004546:Elapid Venoms / Q000494:pharmacology*; D005089:Exocytosis / Q000187:drug effects* / Q000502:physiology; D006624:Hippocampus / Q000187:drug effects / Q000378:metabolism; D008565:Membrane Proteins / Q000378:metabolism*; D050683:R-SNARE Proteins; D051381:Rats; D017207:Rats, Sprague-Dawley; D013572:Synaptic Vesicles / Q000187:drug effects* / Q000378:metabolism; D016708:Synaptophysin / Q000378:metabolism*
D004546:Elapid Venoms; D008565:Membrane Proteins; D050683:R-SNARE Proteins; D016708:Synaptophysin; C015523:taipoxin