GABAergic

GABAergic refers to the neurons, pathways, and mechanisms that utilize gamma-aminobutyric acid (GABA), the chief inhibitory neurotransmitter in the mammalian central nervous system. GABAergic systems are involved in a wide range of physiological functions, including mood regulation, pain perception, and sleep.

Overview

GABAergic neurons produce GABA, which acts to inhibit the activity of connected neurons. This inhibitory function is crucial for the overall balance of excitation and inhibition in the brain, a balance that is necessary for normal brain function.

GABAergic Neurons

Neurons that produce GABA as their primary neurotransmitter are referred to as GABAergic neurons. These neurons are distributed throughout the brain and spinal cord, and they play key roles in many different brain functions. GABAergic neurons are particularly abundant in the cerebral cortex, hippocampus, and amygdala, where they contribute to cognitive processes, memory formation, and emotional responses, respectively.

GABAergic Transmission

GABAergic transmission involves the release of GABA from the presynaptic neuron, its binding to GABA receptors on the postsynaptic neuron, and the subsequent hyperpolarization of the postsynaptic neuron. This hyperpolarization makes it less likely that the postsynaptic neuron will fire an action potential, thereby inhibiting its activity.

GABA Receptors

There are two main types of GABA receptors: GABA_A receptors and GABA_B receptors. GABA_A receptors are ionotropic receptors that, when activated by GABA, allow the flow of chloride ions into the neuron, leading to hyperpolarization. GABA_B receptors are metabotropic receptors that, when activated by GABA, lead to the opening of potassium channels and the inhibition of calcium channels, also resulting in hyperpolarization.

Clinical Significance

Alterations in GABAergic function have been implicated in a variety of neurological and psychiatric disorders, including epilepsy, anxiety disorders, depression, and schizophrenia. Many drugs used to treat these conditions, such as benzodiazepines and barbiturates, act by enhancing GABAergic transmission.

Ball-and-stick model of the GABA molecule. GABA is the primary inhibitory neurotransmitter in the mammalian central nervous system.

See Also

• Neurotransmitter
• Gamma-aminobutyric acid
• Neuron
• Central nervous system
• Neurological disorders