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Methyl parathion induced alterations in GABAergic system during critical stage of central nervous system development
P Mahaboob Basha1, Nayeemunnisa
1Department of Zoology, Bangalore University, India.
Insights
Methyl parathion exposure significantly boosted the inhibitory GABAergic system in developing rat pups. This organophosphate pesticide enhanced GABA levels and related enzyme activity in the central nervous system.
Area of Science:
- Neuroscience
- Toxicology
- Developmental Biology
Background:
- Methyl parathion is an organophosphate pesticide with known neurotoxic effects.
- The GABAergic system is the primary inhibitory neurotransmitter system in the central nervous system (CNS).
- Developing nervous systems are particularly vulnerable to environmental toxins.
Purpose of the Study:
- To investigate the effects of sublethal methyl parathion doses on the GABAergic system in developing rat pups.
- To determine how methyl parathion influences neurotransmitter levels and enzyme activity within the CNS.
Main Methods:
- Sublethal doses of methyl parathion were administered intraperitoneally to 7-day-old albino rat pups.
- Levels of the inhibitory neurotransmitter GABA were measured.
- Activities of key enzymes in GABA synthesis and metabolism (glutamic acid decarboxylase and 4-aminobutyrate-2-oxoglutarate-amino transferase) were assessed in various CNS regions.
Main Results:
- Methyl parathion induced significant alterations in the inhibitory GABAergic system.
- A substantial potentiation of the inhibitory system was observed.
- GABA levels and the activity of associated enzymes (GAD and GABA-T) increased in the cortex, brain stem, and spinal cord.
- These findings suggest methyl parathion potentiates inhibitory transmission while suppressing the cholinergic system.
Conclusions:
- Sublethal methyl parathion exposure enhances the central nervous system's inhibitory GABAergic transmission in developing rats.
- This potentiation occurs alongside a suppression of the cholinergic system.
- These neurochemical changes highlight the developmental neurotoxicity of methyl parathion.
Abstract:
Sublethal doses of methyl parathion (o, o-dimethyl-o-nitrophenyl thiophosphate) injected intraperitoneally to 7th day old developing albino rat pups induced alterations in the inhibitory GABAergic system of CNS. A substantial simulation of the inhibitory system was noticed. A profound increase was found in the level of the inhibitory transmitter, GABA on methyl parathion injection. An increase in the activity levels of the enzymes glutamic acid decarboxylase and 4-aminobutyrate-2-oxoglutarate-amino transferase in the cortex, brain stem and spinal cord of the CNS was found. It is observed that methyl parathion causes potentiation of the inhibitory transmission (GABAergic system) in the wake of inducing suppression of cholinergic system in CNS of developing rat pups.