Iron Oxide Nanoparticles Affects Behaviour and Monoamine Levels in Mice

Area of Science:

• Nanomedicine
• Neuroscience
• Toxicology

Background:

• Iron oxide nanoparticles (Fe2O3 NPs) possess unique magnetic properties valuable in biomedical applications.
• While Fe2O3 NP neurotoxicity is known, the specific factors influencing neurobehavioral changes remain unclear.

Purpose of the Study:

• To investigate the neurobehavioral effects of oral Fe2O3 NP exposure in mice.
• To elucidate the underlying mechanisms of Fe2O3 NP-induced neurotoxicity.

Main Methods:

• Mice were administered Fe2O3 NPs (25 and 50 mg/kg) daily for 30 days via oral intubation.
• Neurobehavioral tests, brain tissue analysis (mitochondria, ATPase activity, ion homeostasis, myelin, protein expression), and neurotransmitter level assessments were performed.

Main Results:

• Fe2O3 NP exposure significantly impaired motor coordination and memory.
• Mitochondrial damage, reduced energy levels, and decreased ATPase activity were observed in brain regions.
• Disturbed ion homeostasis, axonal demyelination, altered intracellular calcium, and changes in dopamine, norepinephrine, and epinephrine levels were noted.
• Increased glial fibrillary acidic protein (GFAP) confirmed neuronal damage.

Conclusions:

• Oral exposure to Fe2O3 NPs induces significant neurobehavioral deficits in mice.
• Mechanisms include mitochondrial dysfunction, impaired ion homeostasis, demyelination, altered neurotransmitter systems, and neuronal damage.