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Updated: May 22, 2026
Neurodevelopmental Reflex Testing in Neonatal Rat Pups
Published on: April 24, 2017
Aluminum overload increases oxidative stress in four functional brain areas of neonatal rats
Chia-Yi Yuan1, Yih-Jing Lee, Guoo-Shyng Wang Hsu
1Graduate Institute of Nutrition and Food Sciences, Fu-Jen Catholic University, Hsinchuang, New Taipei City, Taiwan.
Insights
High aluminum exposure in infant formula may harm neonatal brain development. This study found aluminum overload increases oxidative stress in key brain regions of young rats, impacting antioxidant enzyme activity.
Area of Science:
- Neuroscience
- Toxicology
- Biochemistry
Background:
- Concerns exist regarding aluminum (Al) content in infant formula and its potential impact on neonatal brain development.
- This study investigates Al distribution, concentration, and induced oxidative stress in neonatal rat brains.
Purpose of the Study:
- To evaluate the distribution and concentration of aluminum in the neonatal rat brain after aluminum treatment.
- To assess the oxidative stress in brain tissues induced by aluminum overload in neonatal rats.
Main Methods:
- Neonatal rat pups (n=46) were administered aluminum chloride (AlCl3) at varying doses (0, 7, 35 mg/kg) over 14 days.
- Aluminum concentrations and oxidative stress markers (TBARS, SOD, catalase, GPx) were measured in different brain regions.
Main Results:
- Significantly higher aluminum concentrations were observed in the hippocampus, diencephalon, and cerebellum of the high Al group.
- Increased lipid peroxidative products (TBARS) and altered antioxidant enzyme activities (SOD, catalase, GPx) were noted in multiple brain regions.
- Aluminum overload led to increased oxidative stress (H2O2) in the hippocampus, diencephalon, cerebellum, and brain stem.
Conclusions:
- Aluminum overload significantly increases aluminum deposition in specific neonatal rat brain regions.
- Elevated aluminum levels induce oxidative stress and alter antioxidant defense mechanisms in the developing brain.
- Findings highlight potential risks of aluminum exposure to neonatal brain development.
Background:
Higher aluminum (Al) content in infant formula and its effects on neonatal brain development are a cause for concern. This study aimed to evaluate the distribution and concentration of Al in neonatal rat brain following Al treatment, and oxidative stress in brain tissues induced by Al overload.
Methods:
Postnatal day 3 (PND 3) rat pups (n =46) received intraperitoneal injection of aluminum chloride (AlCl3), at dosages of 0, 7, and 35 mg/kg body wt (control, low Al (LA), and high Al (HA), respectively), over 14 d.
Results:
Aluminum concentrations were significantly higher in the hippocampus (751.0 ± 225.8 ng/g v.s. 294.9 ± 180.8 ng/g; p < 0.05), diencephalon (79.6 ± 20.7 ng/g v.s. 20.4 ± 9.6 ng/g; p < 0.05), and cerebellum (144.8 ± 36.2 ng/g v.s. 83.1 ± 15.2 ng/g; p < 0.05) in the HA group compared to the control. The hippocampus, diencephalon, cerebellum, and brain stem of HA animals displayed significantly higher levels of lipid peroxidative products (TBARS) than the same regions in the controls. However, the average superoxide dismutase (SOD) activities in the cerebral cortex, hippocampus, cerebellum, and brain stem were lower in the HA group compared to the control. The HA animals demonstrated increased catalase activity in the diencephalon, and increased glutathione peroxidase (GPx) activity in the cerebral cortex, hippocampus, cerebellum, and brain stem, compared to controls.
Conclusion:
Aluminum overload increases oxidative stress (H2O2) in the hippocampus, diencephalon, cerebellum, and brain stem in neonatal rats.
