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Published on: November 20, 2015
Protective effects of selenium to placental lead neurotoxicity in rat pups
1Department of Biophysics, Punjab University, Chandigarh, India.
Insights
Selenium supplementation may protect developing rat pups from lead-induced neurotoxicity. Lead exposure reduced key enzyme activities, but selenium mitigated these effects, particularly in the cerebrum.
Area of Science:
- Neuroscience
- Toxicology
- Biochemistry
Background:
- Lead neurotoxicity is an age-dependent phenomenon influenced by nutritional status and micronutrients.
- Maternal lead exposure during gestation can impact offspring neurodevelopment.
- Selenium is a micronutrient with potential antioxidant and protective properties.
Purpose of the Study:
- To investigate the protective effects of selenium against lead-induced neurotoxicity in rat pups.
- To assess the impact of maternal lead exposure and selenium co-administration on specific enzyme activities in the brain regions of offspring.
Main Methods:
- Parental rats were exposed to lead and/or selenium for 8 weeks prior to and during gestation.
- Rat pups were studied at 4 weeks of age after a 1-month lactation period.
- Enzyme activities of succinic dehydrogenase (SDH), acetylcholine esterase (AChE), and Na+/K+-ATPase were measured in the cerebrum and cerebellum.
Main Results:
- Lead exposure significantly reduced SDH, AChE (in cerebellum), and Na+/K+-ATPase activities in rat pups.
- Cerebral AChE activity showed an increase in the lead-exposed group.
- Co-administration of selenium with lead attenuated the observed reductions in enzyme activities, indicating a protective effect.
Conclusions:
- Selenium exhibits protective effects against lead-induced neurotoxicity in developing rat pups.
- Selenium supplementation may be a viable strategy to mitigate the adverse neurological impacts of lead exposure.
- Further research is warranted to elucidate the precise mechanisms of selenium's neuroprotective action against lead.
Abstract:
The neurotoxic effects of lead are age-related phenomena, which in turn are dependent on nutrition status as well as the presence of other micronutrients. The present study was designed to study the protective effects of selenium on rat pups exposed to lead. The activities of different enzymes in cerebrum and cerebellum regions were estimated following maternal lead neurotoxicity through placenta. The parental animals were exposed to different treatments for 5 weeks prior to gestation and 3 weeks during gestation; that is, animals were exposed for a total period of 8 weeks and rat pups obtained from exposed parents were allowed to survive on their mothers' milk for a period of 1 month, after which they were sacrificed. Activities of succinic dehydrogenase (SDH), acetylcholine estrase (AChE), and Na(+)/K(+)-ATPase were studied in the cerebrum and cerebellum of the rat pups at 4 weeks of age. A significant reduction in the activity of all the three enzymes-SDH, AChE and Na(+)/K(+) -ATPase-was observed in the lead-treated group, except in the case of AChE, which increased in the case of cerebrum. However, changes in different enzyme activities were less pronounced in the animals that were treated simultaneously with selenium and lead. No pups were delivered to the mothers who were exposed to selenium alone for period of 8 weeks.
