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In excitotoxicity, nerve cells suffer damage or death when the levels of otherwise necessary and safe neurotransmitters such as glutamate become pathologically high, resulting in excessive stimulation of receptors. For example, when glutamate receptors such as the NMDA receptor or AMPA receptor encounter excessive levels of the excitatory ...
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 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 ...
In hyperammonemic environments (high levels of ammonia), astroglial swelling occurs. [14] [16] [17] Different perspectives have approached the problem of astroglial swelling. One study shows that morphological changes occur that increase GS expression in glutamatergic areas or other adaptations that alleviates high levels of glutamate and ...
Glutamate receptors and impaired regulation (in particular, those resulting in excessive glutamate levels) are also one cause of excitotoxicity (described above), which itself has been implicated or associated with a number of specific neurodegenerative conditions where neural cell death or degradation within the brain occurs over time.
Glutaminase can also be found in the intestines, whereby hepatic portal ammonia can reach as high as 0.26 mM (compared to an arterial blood ammonia of 0.02 mM). One of the most important roles of glutaminase is found in the axonal terminals of neurons in the central nervous system .
Glutamate carboxypeptidase II. TAH molecule, also known as N-acetyl-L-aspartyl-L-glutamate peptidase I (NAALADase I), NAAG peptidase, or prostate-specific membrane antigen (PSMA) is an enzyme that in humans is encoded by the FOLH1 (folate hydrolase 1) gene. [5] Human GCPII contains 750 amino acids and weighs approximately 84 kDa.
A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. To be more specific, photoreceptor proteins in ...