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The glutamate/GABA–glutamine cycle is a metabolic pathway that describes the release of either glutamate or GABA from neurons which is then taken up into astrocytes (non-neuronal glial cells). In return, astrocytes release glutamine to be taken up into neurons for use as a precursor to the synthesis of either glutamate or GABA. [2]
[9] [10] Because GABA-T degrades GABA, the inhibition of this enzyme has been the target of many medical studies. [9] The goal of these studies is to find a way to inhibit GABA-T activity, which would reduce the rate that GABA and 2-oxoglutarate are converted to semialdehyde and L-glutamate, thus raising GABA concentration in the brain.
It also has low micromolecular affinity to GABA with a Michaelis-Menten constant of 2.5 μM, [1] and requires the presence of Cl- ions in the extracellular matrix. The GABA transporter help creates an equilibrium of GABA and will work in the reverse direction if needed to maintain the baseline concentration of GABA in the system. [1]
A GABA reuptake inhibitor (GRI) is a type of drug which acts as a reuptake inhibitor for the neurotransmitter gamma-Aminobutyric acid (GABA) by blocking the action of the gamma-Aminobutyric acid transporters (GATs). This in turn leads to increased extracellular concentrations of GABA and therefore an increase in GABAergic neurotransmission. [1]
GABRA2 is an alpha subunit that is part of GABA-A receptors, which are ligand-gated chloride channels and are activated by the major inhibitory neurotransmitter in the mammalian brain, GABA. Chloride conductance of these channels can be modulated by agents, such as benzodiazepines (psychoactive drugs) that bind to the GABA-A receptor.
Glutamic acid (symbol Glu or E; [4] the anionic form is known as glutamate) is an α-amino acid that is used by almost all living beings in the biosynthesis of proteins.It is a non-essential nutrient for humans, meaning that the human body can synthesize enough for its use.
Glutamate, one of the most common neurochemicals in the brain, is an excitatory neurotransmitter involved in many aspects of brain function, including learning and memory. [85] Based upon animal models, exercise appears to normalize the excessive levels of glutamate neurotransmission into the nucleus accumbens that occurs in drug addiction. [21]
GABA is also the primary inhibitory neurotransmitter in the cerebral cortex and has the highest level of expression within it. [15] The GABA affinity (K m) of the mouse isoform of GAT1 is 8 μM. [16] In the brain of a mature mammal, glutamate is converted to GABA by the enzyme glutamate decarboxylase (GAD) along with the addition of vitamin B6.
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