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Infantile auditory exposure and unusual response to antipsychiotic drugs (38510)
Insights
Early-life noise exposure can cause adult animals to have seizures when given certain drugs. This effect, seen in mice and hamsters, suggests a link between infantile auditory experiences and later drug responses.
Area of Science:
- Neuroscience
- Pharmacology
- Developmental Psychology
Background:
- Audiosensitization in early development can have lasting effects.
- Environmental noise exposure during critical developmental periods is a concern.
Purpose of the Study:
- To investigate the long-term effects of infantile auditory exposure on adult animals' responses to psychotropic drugs.
- To determine if early-life noise exposure alters drug-induced seizure susceptibility.
Main Methods:
- Adult mice and hamsters with a history of infantile audiosensitization were administered reserpine and prochlorperazine.
- Control groups received the same drug treatments without prior audiosensitization.
- Seizure incidence and timing post-administration were recorded.
Main Results:
- Audiosensitized animals exhibited a high incidence of drug-induced seizures, unlike tranquilized controls.
- The proconvulsant effect was observed within an hour but subsided by 20 hours post-administration in mice.
- This effect persisted for at least 100 days in sensitized hamsters and was dose-dependent in mice.
Conclusions:
- Infantile auditory experiences can lead to persistent, idiosyncratic responses to antipsychotic drugs in adulthood.
- Environmental noise during early development may prime the nervous system for adverse drug reactions later in life.
- This suggests a potential mechanism for human idiosyncrasies to psychoactive medications.
Abstract:
Reserpine and prochlorperazine were administered in separate experiments to adult CAW:CF1 mice and to adult LVG:LAK hamsters that had recovered from audiosensitization induced by 30 sec of doorbell sound during a critical period of infantile development. In contrast to controls that showed tranquilization in response to these drugs, the previously audiosensitized animals o both species responded with a high incidence of convulsive seizures. The proconvulsant effect of reserpine and prochlorperazine in previously audiosensitized mice was present one hour after drug administration, but had subsided 20 hr post-administration. The proconvulsant effect of reserpine in previously audiosensitized mice was shown to be dose-dependent. The proconvulsant effect of reserpine in previously sensitized hamsters was present 100 days after reserpine and prochlorperazine are poorly understood, possible mechanisms are discussed. Environmental noise during early inantile development appears to have significant residual effects persisting into adult life. This study has shown that idiosyncratic responses to antipsychotic drugs in adult laboratory animals can result from infantile auditory exposure, and it is speculated that human idiosyncrasies to psychoactive drugs may be similarly based.