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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Nicotinic acid adenine dinucleotide phosphate potentiates neurite outgrowth.

Ca(2+) regulates a spectrum of cellular processes including many aspects of neuronal function. Ca(2+)-sensitive events such as neurite extension and axonal guidance are driven by Ca(2+) signals that are precisely organized in both time and space. These complex cues result from both Ca(2+) influx across the plasma membrane and the mobilization of intracellular Ca(2+) stores. In the present study, using rat cortical neurons, we have examined the effects of the novel intracellular Ca(2+)-mobilizing messenger nicotinic acid adenine dinucleotide phosphate (NAADP) on neurite length and cytosolic Ca(2+) levels. We show that NAADP potentiates neurite extension in response to serum and nerve growth factor and stimulates increases in cytosolic Ca(2+) from bafilomycin-sensitive Ca(2+) stores. Simultaneous blockade of inositol trisphosphate and ryanodine receptors abolished the effects of NAADP on neurite length and reduced the magnitude of NAADP-mediated Ca(2+) signals. This is the first report demonstrating functional NAADP receptors in a mammalian neuron. Interplay between NAADP receptors and more established intracellular Ca(2+) channels may therefore play important signaling roles in the nervous system.[1]


  1. Nicotinic acid adenine dinucleotide phosphate potentiates neurite outgrowth. Brailoiu, E., Hoard, J.L., Filipeanu, C.M., Brailoiu, G.C., Dun, S.L., Patel, S., Dun, N.J. J. Biol. Chem. (2005) [Pubmed]
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