Chronic pain. Decreased motivation during chronic pain requires long-term depression in the nucleus accumbens

Science. 2014 Aug 1;345(6196):535-42. doi: 10.1126/science.1253994.


Several symptoms associated with chronic pain, including fatigue and depression, are characterized by reduced motivation to initiate or complete goal-directed tasks. However, it is unknown whether maladaptive modifications in neural circuits that regulate motivation occur during chronic pain. Here, we demonstrate that the decreased motivation elicited in mice by two different models of chronic pain requires a galanin receptor 1-triggered depression of excitatory synaptic transmission in indirect pathway nucleus accumbens medium spiny neurons. These results demonstrate a previously unknown pathological adaption in a key node of motivational neural circuitry that is required for one of the major sequela of chronic pain states and syndromes.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Chronic Pain / physiopathology*
  • Chronic Pain / psychology*
  • Disease Models, Animal
  • Gene Knockdown Techniques
  • Long-Term Synaptic Depression / drug effects
  • Long-Term Synaptic Depression / physiology*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Motivation*
  • Nucleus Accumbens / physiopathology*
  • Receptor, Galanin, Type 1 / antagonists & inhibitors
  • Receptor, Galanin, Type 1 / genetics
  • Receptor, Galanin, Type 1 / physiology*


  • Receptor, Galanin, Type 1