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Related Experiment Videos

Mouse strain-specific changes in nicotinic receptor expression with age.

Lorise C Gahring1, Karina Persiyanov, Scott W Rogers

  • 1Salt Lake City VA-Geriatrics Research, Education and Clinical Center, Salt Lake City, UT 84148, USA. lorise.gahring@hsc.utah.edu

Neurobiology of Aging
|February 19, 2005
PubMed
Summary

Age-related changes in neuronal nicotinic acetylcholine receptor (nAChR) expression differ between mouse strains. Specific nAChR subunits show varied expression changes in the hippocampus with aging, influenced by genetic background.

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Area of Science:

  • Neuroscience
  • Aging Research
  • Molecular Biology

Background:

  • Neuronal nicotinic acetylcholine receptors (nAChRs) play crucial roles in cognitive functions.
  • Age-related decline in nAChR expression is a known phenomenon, but individual variability exists.
  • Understanding strain-specific changes is vital for modeling aging in the brain.

Purpose of the Study:

  • To investigate age-related changes in specific nAChR subunit expression in the hippocampus.
  • To compare these changes between two genetically distinct mouse strains (CBA/J and C57BL/6).
  • To explore potential alterations in nAChR expression in astrocytes.

Main Methods:

  • Quantitative analysis of nAChR subunit expression (alpha4, alpha5, alpha7, beta4) in the dorsal hippocampus.

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  • Comparison between adult (12-14 months) and aged (24-28 months) mice.
  • Immunohistochemical staining to assess nAChR alpha4 in astrocytes.

    • Main Results:

    • Age-related decrease in nAChR alpha4 expression observed in both mouse strains.
    • Significant loss of nAChR alpha7 in aged CBA/J mice (CA1 region), but not C57BL/6.
    • nAChR beta4 expression decreased with age in C57BL/6 mice, while it remained stable or increased in CBA/J mice.
    • Age-associated increase in astrocytic nAChR alpha4 staining in CBA/J mice.

    Conclusions:

    • Mouse strains exhibit dissimilar age-related alterations in hippocampal nAChR subunit expression.
    • Genetic background significantly influences the pattern of nAChR changes during aging.
    • Astrocytic nAChR alpha4 expression may compensate for neuronal loss in certain strains.