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Updated: Aug 8, 2026
Single-Cell Electroporation across Different Organotypic Slice Culture of Mouse Hippocampal Excitatory and Class-Specific Inhibitory Neurons
Published on: October 6, 2020
Deltamethrin differentially affects neuronal subtypes in hippocampal primary culture
G Grosse1, T Thiele, E Heuckendorf
1Institut für Anatomie der Charité, Humboldt-Universität zu Berlin, Philippstr. 12, D-10115 Berlin, Germany.
Abstract:
The effects of deltamethrin on neuronal development and survival were studied using primary mouse hippocampal neurons in culture. Repeated applications of deltamethrin (between 2 nM and 2000 nM) decreased the number of neurons by 16-40%, respectively. Neuronal death was accompanied by an overall decrease of synaptic proteins. Deltamethrin treatment increased the K(+)-stimulated release of amino acid transmitters, GABA and glutamate. The release of the latter might also contribute to neuronal damage. A considerable number of neurons survived treatment with high concentrations of deltamethrin (200-2000 nM) and still displayed characteristics of mature neurons such as synaptic contacts or the expression of members of the Kv1 channel family. When analyzing subtypes of neurons calbindin- as well as somatostatin-positive neurons decreased by 50% after repeated treatment with 2 nM deltamethrin. Under the same conditions neuropeptide Y-positive neurons were up-regulated by 250%.Taken together these data show that deltamethrin at concentrations relevant in human toxicology differentially affects survival of neuronal subtypes by exerting either deleterious or supportive effects. We conclude that deltamethrin disturbs fine-tuning of neuronal efficiency in neuronal networks and might also interfere with the correct wiring during development.
Insights
Deltamethrin exposure harms mouse hippocampal neurons, reducing survival and synaptic proteins. However, it differentially impacts neuronal subtypes, with some showing increased survival and others significant loss.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Deltamethrin is a widely used pyrethroid insecticide.
- Understanding its neurotoxic effects is crucial for public health.
- Neuronal development and network function are sensitive to environmental toxins.
Purpose of the Study:
- To investigate the impact of deltamethrin on primary mouse hippocampal neuron survival and development.
- To analyze the effects of varying deltamethrin concentrations on neuronal subtypes.
- To assess deltamethrin's influence on neurotransmitter release and synaptic protein expression.
Main Methods:
- Primary mouse hippocampal neurons were cultured and exposed to a range of deltamethrin concentrations (2 nM to 2000 nM).
- Neuronal survival, synaptic protein levels, and neurotransmitter release (GABA, glutamate) were quantified.
- Specific neuronal subtypes (calbindin, somatostatin, neuropeptide Y positive) were analyzed.
Main Results:
- Deltamethrin exposure (2-2000 nM) decreased neuronal numbers by 16-40% and reduced synaptic proteins.
- Increased release of GABA and glutamate was observed following deltamethrin treatment.
- Low deltamethrin concentrations (2 nM) reduced calbindin and somatostatin neurons by 50%, while up-regulating neuropeptide Y neurons by 250%.
Conclusions:
- Deltamethrin exhibits differential toxicity towards neuronal subtypes at concentrations relevant to human exposure.
- The insecticide disrupts neuronal network efficiency and may interfere with proper neural development.
- High concentrations of deltamethrin allowed some mature neuronal characteristics to persist.
