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Related Experiment Videos

Decrease in non-selective, non-sustained attention induced by a chronic visceral inflammatory state as a new pain

Magali Millecamps1, Monique Etienne, Didier Jourdan

  • 1INSERM/UdA E 9904, Laboratoire de Pharmacologie Médicale, Faculté de Médecine, 63001 Clermont-Ferrand Cedex 1, France.

Pain
|May 26, 2004
PubMed
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A new behavioral test in rats revealed that colitis impairs attention. Effective analgesics like morphine and acetaminophen improved attention and reduced pain sensitivity, unlike aspirin or ibuprofen.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Colitis induction in rats using 2,4,6-trinitrobenzenesulfonic acid (TNBS) is a common model for inflammatory bowel disease.
  • Pain assessment in animal models often relies on behavioral responses, but cognitive impairments associated with pain require further investigation.

Purpose of the Study:

  • To develop a novel behavioral pain test assessing cognitive impairments in rats with colitis.
  • To evaluate the efficacy of different acute analgesic treatments on cognitive function and tactile hypersensitivity.

Main Methods:

  • Colitis was induced in rats using TNBS enema.
  • A new behavioral test measured attentional level by assessing the ability to detect a modified object in a familiar environment.
  • Analgesic effects of morphine, acetaminophen, aspirin, and ibuprofen were assessed using this new test and a Von Frey test for tactile hypersensitivity.

Related Experiment Videos

Main Results:

  • Rats with colitis exhibited decreased attentional levels without changes in locomotor activity, environmental interest, or memory.
  • Morphine and acetaminophen significantly improved attentional levels and reduced tactile hypersensitivity.
  • Aspirin and ibuprofen did not show significant effects on attentional level or tactile hypersensitivity.

Conclusions:

  • The novel behavioral test effectively detects cognitive impairments (decreased attention) associated with colitis-induced pain in rats.
  • Effective analgesic treatments can alleviate attention deficits in painful states.
  • This approach may lead to new behavioral tests for assessing spontaneous pain in chronic pain conditions.