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Test of some aging hypotheses using two-dimensional protein mapping.

D L Wilson, M E Hall, G C Stone

    Gerontology
    |January 1, 1978
    PubMed
    Summary
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    This study compared proteins in young and old rat sympathetic ganglia, finding no evidence for common cellular aging theories. Results suggest alternative aging mechanisms may be at play in rats.

    Area of Science:

    • Neuroscience
    • Gerontology
    • Molecular Biology

    Background:

    • Cellular aging theories propose various mechanisms for age-related protein changes.
    • These theories include error catastrophe, somatic mutation, cross-linkage, translational aging, deamidation, and autoimmune factors.

    Purpose of the Study:

    • To investigate age-related protein alterations in the superior cervical sympathetic ganglia (SCSG) of Fischer rats.
    • To test predictions of major cellular aging theories regarding protein size and charge modifications.

    Main Methods:

    • Proteins from young (2-12 months) and old (21-24 months) male Fischer rats' SCSG were analyzed.
    • In vitro 14C-leucine labeling was used to assess newly synthesized proteins.
    • High-resolution two-dimensional polyacrylamide gel electrophoresis (O'Farrell's technique) separated proteins by isoelectric point and molecular weight.

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    Main Results:

    • Analysis of protein amounts (staining patterns) and newly synthesized proteins (autoradiographs) revealed no changes predicted by the tested aging theories.
    • Neither protein size nor charge modifications consistent with error catastrophe, somatic mutation, or other theories were observed.

    Conclusions:

    • The findings do not support several prominent cellular aging theories in the context of rat SCSG.
    • Alternative molecular mechanisms likely underlie the aging process in rat sympathetic nervous system proteins.