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Pain-induced adaptations in the claustro-cingulate pathway.

Niels R Ntamati1, Mario A Acuña1, Thomas Nevian1

  • 1Department of Physiology, University of Bern, Bühlplatz 5, 3012 Bern, Switzerland.

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Persistent pain involves an overactive anterior cingulate cortex (ACC). The claustrum (CLA) normally transmits aversion signals to the ACC, but this connection weakens with chronic pain, contributing to pain states.

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2-photon imagingCP: Neuroscienceallodyniaanterior cingulate cortexchronic painclaustruminflammatory painprefrontal cortexsynaptic plasticity

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Area of Science:

  • Neuroscience
  • Pain Research
  • Cellular and Molecular Biology

Background:

  • Persistent pain is linked to anterior cingulate cortex (ACC) hyperexcitability.
  • Maladaptive changes in afferent circuits during pain chronification are not fully understood.
  • The claustrum's role in pain processing, particularly its projections to the ACC (CLA_ACC), warrants investigation.

Purpose of the Study:

  • To investigate the function of claustrum (CLA_ACC) neurons in acute and chronic inflammatory pain.
  • To elucidate the role of the claustro-cingulate pathway in pain processing and chronification.
  • To identify mechanisms underlying functional impairments in persistent pain states.

Main Methods:

  • Utilized a mouse model of inflammatory pain.
  • Employed chemogenetics to manipulate CLA_ACC neuron activity.
  • Applied in vivo calcium imaging and ex vivo electrophysiology to assess neuronal function.

Main Results:

  • Acute suppression of CLA_ACC activity reduced allodynia.
  • The claustrum was identified as a key transmitter of aversive information to the ACC.
  • Prolonged pain led to a functional impairment in the claustro-cingulate pathway.
  • This impairment involved reduced excitatory drive onto ACC pyramidal neurons, decreasing claustrum influence.

Conclusions:

  • The claustrum plays a critical role in processing nociceptive information.
  • The claustro-cingulate pathway is susceptible to maladaptive changes during persistent pain.
  • Dysfunctional claustro-cingulate signaling contributes to the pathophysiology of chronic pain.