Abstract
Extensive use of aluminum (Al) in industry, cooking utensils, and wrapping or freezing the food items, due to its cheapness and abundance in the environment, has become a major concern. Growing evidence supports that environmental pollutant Al promotes the aggregation of amyloid beta (Aβ) in the brain, which is the main pathological marker of Alzheimer’s disease (AD). Further, AD- and Al-induced neurotoxic effects are more common among women following reproductive senescence due to decline in estrogen. Though clinically Ginkgo biloba extract (GBE) has been exploited as a memory enhancer, its role in Al-induced neurotoxicity in reproductive senescent female rats needs to be evaluated. Animals were exposed to intraperitoneal dose (10 mg/kg b.wt) of Al and oral dose (100 mg/kg b.wt.) of GBE daily for 6 weeks. A significant decline in the Al-induced Aβ aggregates was observed in hippocampal and cortical regions of the brain with GBE supplementation, as confirmed by thioflavin (ThT) and Congo red staining. GBE administration significantly decreased the reactive oxygen species, lipid peroxidation, nitric oxide, and citrulline levels in comparison to Al-treated rats. On the contrary, a significant increase in the reduced glutathione, GSH/GSSG ratio as well as in the activities of antioxidant enzymes was observed with GBE administration. Based on the above results, GBE prevented the neuronal loss in the hippocampus and cortex, hence caused significant improvement in the learning and memory of the animals in terms of AChE activity, serotonin levels, Morris water maze, and active and passive avoidance tests. In conclusion, GBE has alleviated the behavioral, biochemical, and histopathological alterations due to Al toxicity in rats. However, molecular studies are going on to better understand the mechanism of GBE protection against the environmental toxicant Al exposure.
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Abbreviations
- Al:
-
Aluminum
- LPO:
-
Lipid peroxidation
- ROS:
-
Reactive oxygen species
- DCF:
-
2′7′-Dichlorofluorescceine
- MDA:
-
Malondialdehyde
- AChE:
-
Acetylcholinesterase
- MWM:
-
Morris Water Maze
- EPM:
-
Elevated Plus Maze
- SOD:
-
Superoxide dismutase
- GPx:
-
Glutathione peroxidase
- GST:
-
Glutathione s-transferase
- GBE:
-
Ginkgo biloba extract
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Acknowledgements
The University Research fellowship (1241/Estt-I, dated 7/2/2013) to Ms. Sonia Verma is highly appreciated.
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All the protocols performed were approved (PU/45/99/CPCSEA/IAEC/2018/153) by the Animal Ethical Committee (IAEC) (NIH publications; Rule No. 23-85, as revised in 1985) of Panjab University, Chandigarh, India.
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Highlights
• Aluminum lactate exposure to reproductive senescent animals showed amyloid beta aggregation.
• There was cognitive and memory loss leading to anxiety in animals.
• Aluminum exposure resulted in oxidative damage and decrease in antioxidant enzymes.
• Ginkgo biloba extract prevented Al-induced amyloid beta aggregation and neuronal loss.
• Ginkgo biloba improved behavioral and biochemical alterations in middle-aged female rats.
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Verma, S., Ranawat, P., Sharma, N. et al. Ginkgo biloba attenuates aluminum lactate-induced neurotoxicity in reproductive senescent female rats: behavioral, biochemical, and histopathological study. Environ Sci Pollut Res 26, 27148–27167 (2019). https://doi.org/10.1007/s11356-019-05743-5
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DOI: https://doi.org/10.1007/s11356-019-05743-5