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Related Concept Videos

Nociception01:44

Nociception

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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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Phyllanthus amarus does not affect hypernociception in experimental autoimmune encephalomyelitis.

Graziella Rigueira Molska1, Giuseppina Negri1, Lyvia Izaura Gomes Paula-Freire1

  • 1Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, Brazil.

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|March 11, 2014
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Phyllanthus amarus extracts did not alleviate pain in mice with experimental autoimmune encephalomyelitis (EAE). This study found no antihypernociceptive effect of P. amarus in EAE mice.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Immunology

Background:

  • Multiple sclerosis (MS) is a central nervous system inflammatory disease.
  • Chronic pain is a significant symptom in MS patients.
  • Phyllanthus amarus extracts show potential antinociceptive properties in animal models.

Purpose of the Study:

  • To investigate the antihypernociceptive effect of a hexanic extract of Phyllanthus amarus (P. amarus) in a mouse model of multiple sclerosis, experimental autoimmune encephalomyelitis (EAE).

Main Methods:

  • Chemical composition of the hexanic extract was analyzed using gas chromatography-mass spectrometry.
  • Mice with EAE were treated with P. amarus extract (100, 200, or 400 mg/kg) for 26 days.
  • Motor coordination and mechanical hypernociception were assessed regularly.

Main Results:

  • The primary lignans identified were phyllanthin, niranthin, and 5-demethoxyniranthin.
  • The P. amarus extract did not impact EAE development, motor coordination, or pain threshold in treated mice.
  • No significant antihypernociceptive activity was observed at any tested dose.

Conclusions:

  • The hexanic extract of P. amarus demonstrated no antihypernociceptive activity in the experimental autoimmune encephalomyelitis mouse model.
  • Further research may be needed to explore other P. amarus components or different models for pain management in MS.
  • These findings suggest that this specific extract may not be a viable option for managing pain associated with EAE.