TY - JOUR T1 - Taipoxin Induces Synaptic Vesicle Exocytosis and Disrupts the Interaction of Synaptophysin I with VAMP2 JF - Molecular Pharmacology JO - Mol Pharmacol SP - 1901 LP - 1908 DO - 10.1124/mol.104.005678 VL - 67 IS - 6 AU - Dario Bonanomi AU - Maria Pennuto AU - Michela Rigoni AU - Ornella Rossetto AU - Cesare Montecucco AU - Flavia Valtorta Y1 - 2005/06/01 UR - http://molpharm.aspetjournals.org/content/67/6/1901.abstract N2 - The application of the snake neurotoxin taipoxin to hippocampal neurons in culture induced Ca2+-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. ER -