Age-related difference in nociceptive behavior between SAMP6 and SAMR1 strains

Area of Science:

• Gerontology
• Neuroscience
• Pain Research

Background:

• Senescence accelerated prone mouse 6 (SAMP6) mice model accelerated aging.
• SAMP6 mice display reduced bone mass and memory deficits at later ages.
• Nervous system function changes may occur early in SAMP6 mice.

Purpose of the Study:

• To investigate age-related abnormalities in nociceptive (pain) transmission in SAMP6 mice.
• To compare pain responses in SAMP6 mice with senescence accelerated resistant mouse 1 (SAMR1) controls.
• To determine if SAMP6 mice exhibit altered responses to mechanical, thermal, and chemical stimuli.

Main Methods:

• Utilized von Frey, hot plate, and formalin paw tests to assess nociception.
• Compared SAMP6 and SAMR1 mice at 1 and 4 months of age.
• Analyzed responses to mechanical, thermal, and chemical pain stimuli.

Main Results:

• SAMP6 and SAMR1 mice showed similar responses in von Frey and hot plate tests.
• In the formalin paw test, 1-month-old mice had comparable responses.
• 4-month-old SAMP6 mice displayed attenuated phase 2 (chemically induced) pain response but normal phase 1 response.

Conclusions:

• The onset of age-related phenotypes in SAMP6 mice varies across different tissues.
• SAMP6 mice demonstrate altered nociceptive transmission with age.
• SAMP6 mice are a valuable model for investigating age-related pain mechanisms.