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Related Experiment Videos

Exaggerated response to (+)amphetamine in geriatric bergils

R H Tannen, E F Domino

    Gerontology
    |January 1, 1977
    PubMed
    Summary

    Older gerbils exhibit heightened sensitivity to amphetamine, showing increased activity, body temperature changes, and reduced lethal dose (LD50). These age-related differences in drug response were not due to altered drug levels or clearance.

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    Area of Science:

    • Gerontology
    • Neuropharmacology
    • Toxicology

    Background:

    • Aging impacts physiological responses to drugs.
    • Understanding age-related changes in drug toxicity is crucial for public health.

    Purpose of the Study:

    • To compare locomotor activity, body temperature, and amphetamine toxicity between young adult and old gerbils.
    • To investigate the underlying mechanisms of age-related differences in drug response.

    Main Methods:

    • Young adult (6-8 months) and old (greater than 24 months) gerbils were administered (+)amphetamine intraperitoneally.
    • Locomotor activity, body temperature, and LD50 were measured.
    • Drug levels in blood and brain, and drug clearance rates were assessed.

    Main Results:

    • Old gerbils displayed greater locomotor activity and hyperthermia in response to (+)amphetamine.
    • The LD50 of (+)amphetamine was significantly lower in old gerbils compared to young adults.
    • No age-related differences were observed in drug levels, clearance, thermoregulation under extreme conditions, or response to apomorphine.

    Conclusions:

    • Aging in gerbils leads to increased sensitivity and toxicity to (+)amphetamine.
    • These age-related effects are not attributable to altered pharmacokinetics (drug levels or clearance).
    • Further research is needed to elucidate the specific mechanisms driving these observed age-dependent neuropharmacological changes.

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