TY - JOUR T1 - Neuropeptidergic Signaling and Active Feeding State Inhibit Nociception in <em>Caenorhabditis elegans</em> JF - The Journal of Neuroscience JO - J. Neurosci. SP - 3157 LP - 3169 DO - 10.1523/JNEUROSCI.1128-15.2016 VL - 36 IS - 11 AU - Marina Ezcurra AU - Denise S. Walker AU - Isabel Beets AU - Peter Swoboda AU - William R. Schafer Y1 - 2016/03/16 UR - http://www.jneurosci.org/content/36/11/3157.abstract N2 - Food availability and nutritional status are important cues affecting behavioral states. Here we report that, in Caenorhabditis elegans, a cascade of dopamine and neuropeptide signaling acts to inhibit nociception in food-poor environments. In the absence of food, animals show decreased sensitivity and increased adaptation to soluble repellents sensed by the polymodal ASH nociceptors. The effects of food on adaptation are affected by dopamine and neuropeptide signaling; dopamine acts via the DOP-1 receptor to decrease adaptation on food, whereas the neuropeptide receptors NPR-1 and NPR-2 act to increase adaptation off food. NPR-1 and NPR-2 function cell autonomously in the ASH neurons to increase adaptation off food, whereas the DOP-1 receptor controls neuropeptide release from interneurons that modulate ASH activity indirectly. These results indicate that feeding state modulates nociception through the interaction of monoamine and neuropeptide signaling pathways. ER -