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• W2083883217 abstract "Targeting of glutamate receptors (GluRs) to synapses involves rapid movement of intracellular receptors. This occurs in forms of synaptic upregulation of receptors, such as long-term potentiation. Thus, many GluRs are retained in a cytoplasmic pool in dendrites, and are transported to synapses for upregulation, presumably via motor proteins such as myosins travelling along cytoskeletal elements that extend up into the spine. In this ultrastructural immunogold study of the cerebellar cortex, we compared synapses between normal rats/mice and dilute lethal mutant mice. These mutant mice lack myosin Va, which has been implicated in protein trafficking at synapses. The postsynaptic spine in the cerebellum lacks the inositol trisphosphate receptor (IP3R) -laden reticular tubules that are found in normal mice and rats (Takagishi et al., Neurosci. Lett., 1996, 215, 169). Thus, we tested the hypothesis that myosin Va is necessary for transport of GluRs and associated proteins to spine synapses. We found that these spines retain a normal distribution of (i) GluRs (delta 1/2, GluR2/3 and mGluR1alpha), (ii) at least one associated MAGUK (membrane-associated guanylate kinase) protein, (iii) Homer (which interacts with mGluR1alpha and IP3Rs), (iv) the actin cytoskeleton, (v) the reticulum-associated protein BiP, and (vi) the motor-associated protein, dynein light chain. Thus, while myosin Va may maintain the IP3R-laden reticulum in the spine for proper calcium regulation, other mechanisms must be involved in the delivery of GluRs and associated proteins to synapses. Other possible mechanisms include diffusion along the extrasynaptic membrane and delivery via other motors running along the spine's actin cytoskeleton." @default.
• W2083883217 created "2016-06-24" @default.
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• W2083883217 date "2001-05-01" @default.
• W2083883217 modified "2023-10-05" @default.
• W2083883217 title "Glutamate receptor targeting in the postsynaptic spine involves mechanisms that are independent of myosin Va" @default.
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• W2083883217 doi "https://doi.org/10.1046/j.0953-816x.2001.01553.x" @default.
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