GABA metabolism enzymes

GABA metabolism enzymes are a group of proteins responsible for the synthesis and degradation of gamma-aminobutyric acid (GABA), the primary inhibitory neurotransmitter in the central nervous system. The pathway, often referred to as the GABA shunt, primarily involves glutamate decarboxylase (GAD) for synthesis and GABA transaminase (GABA-T) and succinic semialdehyde dehydrogenase (SSADH) for catabolism. These enzymes play a critical role in maintaining the balance between excitatory and inhibitory signaling in the brain, which is essential for normal cognitive and motor function. Dysregulation of these enzymes is linked to various neurological and metabolic disorders, including epilepsy, schizophrenia, and type 1 diabetes. Pharmacological modulation of these enzymes is a key therapeutic strategy; for example, the irreversible inhibition of GABA-T by vigabatrin is used to treat refractory seizures by increasing synaptic GABA levels. Additionally, GAD serves as a major autoantigen in autoimmune conditions like stiff-person syndrome and type 1 diabetes, making it a target for immunotherapeutic vaccines and gene therapies. Beyond the brain, these enzymes are also expressed in peripheral tissues like the liver and pancreas, where they influence glucose metabolism and hormonal secretion.

Other names

GABA shunt enzymesGABAergic metabolic enzymesGamma-aminobutyric acid metabolism enzymes

Irreversible inhibition of GABA transaminase (GABA-T); Immunomodulation and induction of immune tolerance (GAD-alum); Gene replacement therapy (SSADH)