Interneuron

Interneurons are a diverse class of neurons that function as intermediaries between sensory and motor neurons or within local circuits of the central nervous system (StatPearls, 2023). Unlike projection neurons, interneurons typically have short axons and communicate locally to modulate the activity of other neurons, primarily through the release of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA) or the excitatory neurotransmitter glutamate (Nature Reviews Neuroscience, 2017). They play a critical role in maintaining the balance between excitation and inhibition, which is essential for normal brain function, including sensory processing, motor coordination, and cognition (PubMed, 2021). Dysregulation of interneuron function is implicated in various neurological and psychiatric disorders, such as epilepsy, schizophrenia, and autism (NIH, 2022). While not a single molecular target, interneurons express specific receptors and ion channels that are the focus of pharmacological interventions aimed at restoring circuit homeostasis (Frontiers in Neural Circuits, 2020). Therapeutic strategies often involve modulating the activity of these cells through GABAergic agonists or NMDA receptor antagonists to correct circuit-level imbalances (Cell, 2019). Recent advances in cell therapy also explore the transplantation of interneuron progenitors to treat refractory epilepsy and other circuit-based disorders (Nature, 2021).

Other names

Relay neuronAssociation neuronConnector neuronLocal circuit neuron

Modulation of inhibitory or excitatory neurotransmission via specific receptors (e.g., GABAergic or glutamatergic) located on the interneuron cell surface.