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[Abstract Title]. - Society for Neuroscience

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Time: Sunday, November 16, 2008, 1:00 pm - 5:00 pm<br />

Program#/Poster#: 236.18/D18<br />

Topic: B.06.a. Docking and fusion<br />

<strong>Title</strong>: Alpha-synuclein inhibits arachidonic acid-induced exocytosis and SNARE complex<br />

<strong>for</strong>mation<br />

Authors: *F. DARIOS 1 , I. LOPEZ 2 , L. M. GUTIÉRREZ 2 , B. DAVLETOV 1 ;<br />

1 Lab. Mol Biol, Med. Res. Council, Cambridge CB2 0QH, United Kingdom; 2 Univ. Miguel<br />

Hernández, Inst. de Neurociencias, Alicante, Spain<br />

<strong>Abstract</strong>: Alpha-synuclein is a small cytosolic protein involved in several neurodegenerative<br />

diseases including Parkinson‟s disease, but its physiological function is unknown. Recently,<br />

alpha-synuclein has been proposed to regulate the function of SNAREs (soluble Nethylmaleimide-sensitive<br />

factor attachment protein receptors), a set of proteins involved in<br />

vesicle fusion. However, the mechanism of regulation remains unknown. Alpha-synuclein fails<br />

to interact with SNARE proteins suggesting an indirect mode of action.<br />

We have recently shown that polyunsaturated fatty acids act on one of the SNARE proteins,<br />

syntaxin, enhancing the <strong>for</strong>mation of SNARE complex which is instrumental <strong>for</strong><br />

neurotransmitter release. Since alpha-synuclein is also sensitive to polyunsaturated fatty acids,<br />

we analysed alpha-synuclein effects on fatty acid-mediated SNARE interactions. Here we show<br />

that arachidonic acid, an omega-6 polyunsaturated fatty acid involved in the regulation of<br />

neurotransmitter release, stimulates SNARE complex <strong>for</strong>mation and exocytosis, whereas alphasynuclein<br />

blocks this action both in vitro and in vivo. This effect is due to the ability of alphasynuclein<br />

to sequester arachidonic acid, thereby blocking the activation of syntaxin. Our data<br />

shed new light on the action of alpha-synuclein in the modulation of neurotransmission.<br />

Disclosures: F. Darios, None; B. Davletov, None; L.M. Gutiérrez, None; I. Lopez, None.<br />

Poster<br />

236. Neurotransmitter Release: Docking and Fusion<br />

Time: Sunday, November 16, 2008, 1:00 pm - 5:00 pm<br />

Program#/Poster#: 236.19/D19<br />

Topic: B.06.a. Docking and fusion<br />

Support: NSF Grant 0544031

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