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Methylmercury induced alterations in the nerve growth factor level in the developing brain
L Lärkfors1, A Oskarsson, J Sundberg
1Department of Developmental Biology, Uppsala University, Sweden.
Brain Research. Developmental Brain Research
|October 21, 1991
Summary
Methylmercury exposure in developing rats significantly altered nerve growth factor (NGF) levels. Hippocampal NGF increased while septal NGF decreased, suggesting neurotrophic support disruption and potential links to neurodegeneration.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- The developing central nervous system (CNS) is highly vulnerable to methylmercury (MeHg) toxicity.
- Nerve growth factor (NGF) plays a critical role in neuronal development and survival.
- Understanding MeHg's impact on neurotrophic factors like NGF is crucial for assessing developmental neurotoxicity.
Purpose of the Study:
- To investigate the effects of methylmercury exposure on nerve growth factor (NGF) levels during central nervous system (CNS) development.
- To determine if MeHg exposure alters NGF concentrations in specific brain regions like the hippocampus and septum.
- To explore potential mechanisms linking MeHg exposure to neurotrophic support changes and neurodegeneration.
Main Methods:
- Sprague-Dawley rats were exposed to methylmercury (MeHg) through maternal diet during gestation and lactation, and directly post-weaning until postnatal day 50 (P 50).
- NGF levels were quantified in cortical areas and the septum using a sensitive enzyme immunoassay.
- Comparisons were made between MeHg-exposed groups and control animals at P 25 and P 50.
Main Results:
- Methylmercury exposure led to a significant 50% elevation in hippocampal NGF levels at both P 25 and P 50.
- Concurrently, NGF levels decreased by 30% in the septum at P 25 and P 50 in MeHg-exposed pups.
- These findings suggest that MeHg disrupts NGF transport or regulation within the developing brain.
Conclusions:
- Methylmercury exposure alters NGF levels in specific brain regions during development, impacting neurotrophic support.
- The observed changes in NGF may indicate a potential mechanism connecting heavy metal exposure to neurodegenerative processes.
- Further research is needed to elucidate the precise mechanisms and long-term consequences of MeHg-induced alterations in NGF during critical developmental periods.