Aluminium oxide nanoparticles compromise spatial learning and memory performance in rats.

Area of Science:

• Neuroscience
• Toxicology
• Materials Science

Background:

• Nanoparticles' impact on the central nervous system is a growing concern.
• Understanding the neurotoxicity of specific nanoparticles like aluminium oxide is crucial for biosafety assessments.

Purpose of the Study:

• To investigate the effects of aluminium oxide nanoparticles (Al2O3-NPs) on spatial cognition in rats.
• To elucidate the underlying mechanisms, including oxidative stress and mineral homeostasis disruption, in the hippocampus.

Main Methods:

• Male Wistar rats received intravenous Al2O3-NP suspension (20 mg/kg/day) for four days.
• Spatial learning and memory were assessed behaviorally.
• Biochemical analyses measured malondialdehyde, superoxide dismutase, and acetylcholinesterase activity in the hippocampus.
• Aluminium content and mineral element homeostasis were analyzed.

Main Results:

• Al2O3-NPs significantly impaired spatial learning and memory.
• Oxidative stress was induced, evidenced by increased malondialdehyde and decreased superoxide dismutase activity.
• Acetylcholinesterase activity in the hippocampus was reduced.
• Al accumulation increased, and mineral element homeostasis was disrupted in the hippocampus, without altering hippocampal morphology.

Conclusions:

• Al2O3-NPs induce spatial memory deficits in rats.
• The observed cognitive impairment is associated with hippocampal oxidative stress, disrupted mineral element homeostasis, and increased aluminium accumulation.