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Pain and Itch Processing in Aged Mice.

João M Braz1, Katherine Hamel1, Veronica Craik1

  • 1Department of Anatomy, University of California, San Francisco, San Francisco, California.

The Journal of Pain
|July 23, 2023
PubMed
Summary
This summary is machine-generated.

Aging reduces pain and itch sensitivity in mice, but aged mice still develop hypersensitivity after nerve injury. This suggests aging has opposite effects on baseline versus postinjury pain processing.

Keywords:
Painagingitchmousesexual dimorphism

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Area of Science:

  • Neuroscience
  • Gerontology
  • Pain Research

Background:

  • Aging is linked to increased chronic pain prevalence.
  • Preclinical pain studies often lack aged animal models.
  • Understanding age-related pain processing is crucial for therapy development.

Purpose of the Study:

  • To compare pain and itch sensitivities in young and aged mice.
  • To investigate age-related differences in response to stimuli and nerve injury.
  • To explore the impact of aging on pain processing mechanisms.

Main Methods:

  • Comparison of mechanical, thermal, and itch-provoked responses in young (6-month-old) and aged (22-24 month-old) mice.
  • Assessment of pain and itch sensitivity in naïve and nerve-injured conditions.
  • Immunohistochemical analysis of microglial and astrocyte markers post-nerve injury.

Main Results:

  • Aged mice showed reduced sensitivity to mechanical, thermal, and itch stimuli compared to young mice.
  • Following nerve injury, aged mice developed mechanical hypersensitivity, including contralateral allodynia.
  • Age-related decrease in the ipsilateral to contralateral ratio of nerve injury-induced glial marker expression was observed.

Conclusions:

  • Aging has opposing effects on baseline pain/itch sensitivity and postinjury pain processing.
  • Aged mice exhibit reduced baseline sensitivity but develop significant hypersensitivity after nerve injury.
  • Findings highlight the complex role of aging in pain and itch pathways, impacting preclinical research.