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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] [3] [4] The pathway is a minor pathway in GABA synthesis compared to the main pathway in which GABA is synthesized from glutamate. [ 2 ] [ 3 ] [ 4 ] However, the pathway has been found to have an important physiological role in the brain, for instance in the production of GABA in the striatum and resultant inhibition of dopaminergic neurons ...
In pharmacology, GABA A receptor positive allosteric modulators, also known as GABAkines or GABA A receptor potentiators, [1] are positive allosteric modulator (PAM) molecules that increase the activity of the GABA A receptor protein in the vertebrate central nervous system. GABA is a major inhibitory neurotransmitter in the central nervous system.
The ionotropic GABA A receptor protein complex is also the molecular target of the benzodiazepine class of tranquilizer drugs. Benzodiazepines do not bind to the same receptor site on the protein complex as does the endogenous ligand GABA (whose binding site is located between α- and β-subunits), but bind to distinct benzodiazepine binding sites situated at the interface between the α- and ...
[36] [37] [38] Although the term "GABA С receptor" is frequently used, GABA С may be viewed as a variant within the GABA A receptor family. [7] Others have argued that the differences between GABA С and GABA A receptors are large enough to justify maintaining the distinction between these two subclasses of GABA receptors.
For instance, drugs can decrease the rate of synthesis of neurotransmitters by affecting the synthetic enzyme(s) for that neurotransmitter. When neurotransmitter syntheses are blocked, the amount of neurotransmitters available for release becomes substantially lower, resulting in a decrease in neurotransmitter activity.
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]
Purkinje cells mainly release GABA (gamma-aminobutyric acid) neurotransmitter, which inhibits some neurons to reduce nerve impulse transmission. Purkinje cells efficiently control and coordinate the body's motor motions through these inhibitory actions. [3] [4]