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Peripheral nerve injury frequently evokes chronic neuropathic pain. This is initiated by a transient inflammatory response that leads to persistent excitation of dorsal root ganglion (DRG) neurons by inflammatory cytokines such as interleukin 1β(IL-1β). In non-neuronal cells such as lymphocytes, interleukin 1 exerts actions at attomolar (aM; 10-18 M) concentrations. We now report that DRG neurons in defined-medium, neuron-enriched culture display increased excitability following 5-6 d exposure of 1aM IL-1β. This response is mediated in p