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Free chelatable zinc modulates the cholinergic function during hypobaric hypoxia-induced neuronal damage: an in vivo
M Udayabanu1, D Kumaran, A Katyal
1Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi-110007, India.
Neuroscience
|December 6, 2011
Summary
Hypobaric hypoxia impairs memory by altering brain zinc levels. Chelating excess zinc with Ca(2)EDTA protected against memory loss and neuronal damage, suggesting a new therapeutic approach.
Area of Science:
- Neuroscience
- Pharmacology
- Environmental Medicine
Background:
- Hypobaric hypoxia is linked to memory deficits, potentially involving cholinergic system deregulation and neuronal damage.
- Muscarinic receptors influence zinc uptake, yet the connection between hypoxia, memory dysfunction, and brain zinc homeostasis remains unexplored.
Purpose of the Study:
- To investigate the mechanistic relationship between memory dysfunction and zinc homeostasis in the brain following hypobaric hypoxia.
- To evaluate the therapeutic potential of zinc chelation in mitigating hypobaric hypoxia-induced cognitive deficits.
Main Methods:
- Assessed the effects of Ca(2)EDTA, a specific zinc chelator, on spatial working and associative memory in a hypobaric hypoxia model.
- Measured intracellular free chelatable zinc accumulation in hippocampal CA3 pyramidal neurons.
- Quantified neuronal loss and evaluated the expression of choline acetyltransferase, muscarinic receptors 1 and 4, and acetylcholinesterase activity.
Main Results:
- Hypobaric hypoxia led to increased intracellular free chelatable zinc in hippocampal CA3 neurons, correlating with neuronal loss and memory impairment.
- Ca(2)EDTA treatment (1.25 mM/kg) significantly ameliorated spatial and associative memory deficits and reduced neuronal damage.
- Zinc chelation reversed the hypoxia-induced downregulation of choline acetyltransferase, muscarinic receptors 1 and 4, and normalized acetylcholinesterase activity.
Conclusions:
- Free chelatable zinc accumulation during hypobaric hypoxia plays a critical role in neuronal damage and cholinergic dysfunction, contributing to memory impairment.
- Zinc chelation emerges as a promising therapeutic strategy for managing cognitive deficits associated with hypobaric hypoxia.
