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The modulation of neurotransmitter release by calcium channels is well established, yet, sodium channels were regarded mainly as charge carriers. Many lines of evidence suggest a more fine-tuning role played by sodium channels. Using rat cerebrocortical isolated nerve endings (synaptosomes) and two toxins that have separate sites of action on sodium channels and provoke distinct changes in channel...
In this paper we describe the effects of the β scorpion toxin Tityus γ (TiTX γ) and spider neurotoxins Tx3-3 and Tx3-4 in the 45 Ca 2+ uptake in synaptosomes. The TiTX γ-stimulatory effect on 45 Ca 2+ uptake in synaptosomes was inhibited ω-Conotoxin MVIIC (ω-CgTX MVIIC) (0.1 μM) and ω-Agatoxin IVA (0.1 μM) by 70% and 41%, respectively. ω-CgTX MVIIC...
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