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Glutamate receptor
Glutamate receptors are synaptic and non synaptic receptors located primarily on the membranes of neuronal and glial cells. Glutamate (the conjugate base of glutamic acid) is abundant in the human body, but particularly in the nervous system and especially prominent in the human brain where it is the body's most prominent neurotransmitter, the brain's main excitatory neurotransmitter, and also the precursor for GABA, the brain's main inhibitory neurotransmitter. Glutamate receptors are responsible for the glutamate-mediated postsynaptic excitation of neural cells, and are important for neural communication, memory formation, learning, and regulation.
Glutamate receptors are implicated in a number of neurological conditions. Their central role in excitotoxicity and prevalence in the central nervous system has been linked or speculated to be linked to many neurodegenerative diseases, and several other conditions have been further linked to glutamate receptor gene mutations or receptor autoantigen/antibody activity.
Glutamate is the most prominent neurotransmitter in the body, and is the main excitatory neurotransmitter, being present in over 50% of nervous tissue. Glutamate was initially discovered to be a neurotransmitter in insect studies in the early 1960s.
Glutamate is also used by the brain to synthesize GABA (γ-Aminobutyric acid), the main inhibitory neurotransmitter of the mammalian central nervous system. GABA plays a role in regulating neuronal excitability throughout the nervous system and is also directly responsible for the regulation of muscle tone in humans.
Mammalian glutamate receptors are classified based on their pharmacology. However, glutamate receptors in other organisms have different pharmacology, and therefore these classifications do not hold. One of the major functions of glutamate receptors appears to be the modulation of synaptic plasticity, a property of the brain thought to be vital for memory and learning. Both metabotropic and ionotropic glutamate receptors have been shown to have an effect on synaptic plasticity. An increase or decrease in the number of ionotropic glutamate receptors on a postsynaptic cell may lead to long-term potentiation or long-term depression of that cell, respectively. Additionally, metabotropic glutamate receptors may modulate synaptic plasticity by regulating postsynaptic protein synthesis through second messenger systems. Research shows that glutamate receptors are present in CNS glial cells as well as neurons. These glutamate receptors are suggested to play a role in modulating gene expression in glial cells, both during the proliferation and differentiation of glial precursor cells in brain development and in mature glial cells.
Glutamate receptors serve to facilitate the impact of the neurotransmitter glutamate in the central nervous system. These receptors are pivotal in excitatory synaptic transmission, synaptic plasticity, and neuronal development. They are vital for functions like learning, memory, and neuronal communication. Various subtypes of glutamate receptors, such as NMDA (N-methyl-D-aspartate), AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid), and kainate receptors, have distinct roles in synaptic transmission and plasticity.
1. NMDA (N-methyl-D-aspartate) receptors: These receptors are involved in synaptic plasticity, learning, and memory. They are unique in that they require both glutamate and the co-agonist glycine to activate, and they are also voltage-dependent, meaning they only open when the postsynaptic membrane is depolarized. NMDA receptors are permeable to calcium ions, which can trigger intracellular signaling pathways that lead to changes in synaptic strength.
2. AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid) receptors: These receptors mediate the majority of fast excitatory synaptic transmission in the brain. They are permeable to sodium and potassium ions and are responsible for the rapid depolarization of the postsynaptic membrane that underlies the excitatory postsynaptic potential (EPSP). AMPA receptors are also involved in synaptic plasticity, particularly in the early stages of long-term potentiation (LTP).
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Glutamate receptor
Glutamate receptors are synaptic and non synaptic receptors located primarily on the membranes of neuronal and glial cells. Glutamate (the conjugate base of glutamic acid) is abundant in the human body, but particularly in the nervous system and especially prominent in the human brain where it is the body's most prominent neurotransmitter, the brain's main excitatory neurotransmitter, and also the precursor for GABA, the brain's main inhibitory neurotransmitter. Glutamate receptors are responsible for the glutamate-mediated postsynaptic excitation of neural cells, and are important for neural communication, memory formation, learning, and regulation.
Glutamate receptors are implicated in a number of neurological conditions. Their central role in excitotoxicity and prevalence in the central nervous system has been linked or speculated to be linked to many neurodegenerative diseases, and several other conditions have been further linked to glutamate receptor gene mutations or receptor autoantigen/antibody activity.
Glutamate is the most prominent neurotransmitter in the body, and is the main excitatory neurotransmitter, being present in over 50% of nervous tissue. Glutamate was initially discovered to be a neurotransmitter in insect studies in the early 1960s.
Glutamate is also used by the brain to synthesize GABA (γ-Aminobutyric acid), the main inhibitory neurotransmitter of the mammalian central nervous system. GABA plays a role in regulating neuronal excitability throughout the nervous system and is also directly responsible for the regulation of muscle tone in humans.
Mammalian glutamate receptors are classified based on their pharmacology. However, glutamate receptors in other organisms have different pharmacology, and therefore these classifications do not hold. One of the major functions of glutamate receptors appears to be the modulation of synaptic plasticity, a property of the brain thought to be vital for memory and learning. Both metabotropic and ionotropic glutamate receptors have been shown to have an effect on synaptic plasticity. An increase or decrease in the number of ionotropic glutamate receptors on a postsynaptic cell may lead to long-term potentiation or long-term depression of that cell, respectively. Additionally, metabotropic glutamate receptors may modulate synaptic plasticity by regulating postsynaptic protein synthesis through second messenger systems. Research shows that glutamate receptors are present in CNS glial cells as well as neurons. These glutamate receptors are suggested to play a role in modulating gene expression in glial cells, both during the proliferation and differentiation of glial precursor cells in brain development and in mature glial cells.
Glutamate receptors serve to facilitate the impact of the neurotransmitter glutamate in the central nervous system. These receptors are pivotal in excitatory synaptic transmission, synaptic plasticity, and neuronal development. They are vital for functions like learning, memory, and neuronal communication. Various subtypes of glutamate receptors, such as NMDA (N-methyl-D-aspartate), AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid), and kainate receptors, have distinct roles in synaptic transmission and plasticity.
1. NMDA (N-methyl-D-aspartate) receptors: These receptors are involved in synaptic plasticity, learning, and memory. They are unique in that they require both glutamate and the co-agonist glycine to activate, and they are also voltage-dependent, meaning they only open when the postsynaptic membrane is depolarized. NMDA receptors are permeable to calcium ions, which can trigger intracellular signaling pathways that lead to changes in synaptic strength.
2. AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid) receptors: These receptors mediate the majority of fast excitatory synaptic transmission in the brain. They are permeable to sodium and potassium ions and are responsible for the rapid depolarization of the postsynaptic membrane that underlies the excitatory postsynaptic potential (EPSP). AMPA receptors are also involved in synaptic plasticity, particularly in the early stages of long-term potentiation (LTP).