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Arteether causes dose-dependent brainstem injury in rhesus monkeys after 14 days of treatment. This neurotoxicity affects the reticular formation, vestibular, and auditory systems, with shorter treatment durations showing no significant damage.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Toxicology

Background:

  • Arteether is an antimalarial drug.
  • Neurotoxicity is a potential side effect of drug treatments.
  • Understanding arteether's neurotoxic potential is crucial for its safe use.

Purpose of the Study:

  • To investigate the neuroanatomical and neuropathological effects of arteether in male rhesus monkeys.
  • To determine the dose-dependency and duration-dependency of arteether-induced neurotoxicity.
  • To identify specific brain regions affected by arteether administration.

Main Methods:

  • Male rhesus monkeys were administered daily doses of arteether (8, 16, or 24 mg/kg/day) for 7 or 14 days.
  • Control groups received the vehicle (sesame oil) alone.
  • Neurologic signs were monitored, and post-mortem examination included light microscopy of stained brain sections.

Main Results:

  • Fourteen-day treatment with arteether resulted in dose-dependent brainstem injury, most severe at 24 mg/kg/day.
  • Affected brainstem nuclei included the reticular formation, vestibular nuclei, and auditory system nuclei.
  • Seven-day treatment showed no significant neuropathological findings, suggesting a duration-dependent effect.

Conclusions:

  • Arteether induces significant brainstem neurotoxicity in rhesus monkeys following 14 days of administration.
  • The observed neurotoxicity is dose-dependent, with higher doses leading to more severe injury.
  • Shorter treatment durations (7 days) did not produce detectable neuropathological changes in the brainstem.