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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.
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]
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]
Glutamate is a very major constituent of a wide variety of proteins; consequently it is one of the most abundant amino acids in the human body. [1] Glutamate is formally classified as a non-essential amino acid, because it can be synthesized (in sufficient quantities for health) from α-ketoglutaric acid, which is produced as part of the citric acid cycle by a series of reactions whose ...
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.