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Acute high dose arteether toxicity in rats
R F Genovese1, D B Newman, K A Gordon
1Division of Neurosciences, Walter Reed Army Institute of Research, Washington, DC 20307-5100, USA. Raymond.Genovese@NA.AMEDD.ARMY.MIL
Neurotoxicology
|December 11, 1999
Summary
Acute high dose beta-arteether (AE) administration in rats caused significant brainstem neuropathology, particularly in auditory nuclei. Early detection of this neurotoxicity may require focused examination of brainstem functions.
Area of Science:
- Neuroscience
- Toxicology
- Pharmacology
Background:
- Artemisinin-based antimalarials like beta-arteether (AE) are crucial for malaria treatment.
- Previous studies suggest potential neurotoxicity with repeated AE administration.
Purpose of the Study:
- To evaluate the neurotoxic effects of acute high-dose beta-arteether (AE) administration in rats.
- To investigate the impact of AE on auditory discrimination and brainstem histology.
Main Methods:
- Rats were trained on an auditory discrimination task (ADT) and then administered varying doses of AE (25, 75, 125 mg/kg) or vehicle.
- Behavioral performance was monitored for 11 days.
- Histological analysis of brain tissue, focusing on brainstem nuclei, was conducted using specific staining techniques.
Main Results:
- Behavioral performance showed minimal disruption, though some effects were noted at the highest AE dose.
- Statistically significant neuropathology, including chromatolysis, was observed in the nucleus trapezoideus and nucleus superior olive at 75 and 125 mg/kg AE.
- Neuropathology was concentrated in the brainstem, indicating vulnerability of these specific nuclei.
Conclusions:
- A single high dose of beta-arteether (AE) can induce brainstem neuropathology in rats.
- Auditory nuclei within the brainstem are particularly susceptible to AE-induced damage.
- Detecting AE neurotoxicity may necessitate specialized assessment of brainstem functions.