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cofilin NMDAR

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https://www.readbyqxmd.com/read/27372643/partial-amelioration-of-synaptic-and-cognitive-deficits-by-inhibiting-cofilin-dephosphorylation-in-an-animal-model-of-alzheimer-s-disease
#1
Yulei Deng, Jing Wei, Jia Cheng, Ping Zhong, Zhe Xiong, Aiyi Liu, Lin Lin, Shengdi Chen, Zhen Yan
The loss of synaptic structure and function has been linked to the cognitive impairment of Alzheimer's disease (AD). Dysregulation of the actin cytoskeleton, which plays a key role in regulating the integrity of synapses and the transport of synaptic proteins, has been suggested to contribute to the pathology of AD. In this study, we found that glutamate receptor surface expression and synaptic function in frontal cortical neurons were significant diminished in a familial AD (FAD) model, which was correlated with the reduction of phosphorylated cofilin, a key protein regulating the dynamics of actin filaments...
June 28, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/26027926/autism-like-deficits-in-shank3-deficient-mice-are-rescued-by-targeting-actin-regulators
#2
Lara J Duffney, Ping Zhong, Jing Wei, Emmanuel Matas, Jia Cheng, Luye Qin, Kaijie Ma, David M Dietz, Yuji Kajiwara, Joseph D Buxbaum, Zhen Yan
Haploinsufficiency of the Shank3 gene, which encodes a scaffolding protein at glutamatergic synapses, is a highly prevalent and penetrant risk factor for autism. Using combined behavioral, electrophysiological, biochemical, imaging, and molecular approaches, we find that Shank3-deficient mice exhibit autism-like social deficits and repetitive behaviors, as well as the significantly diminished NMDA receptor (NMDAR) synaptic function and synaptic distribution in prefrontal cortex. Concomitantly, Shank3-deficient mice have a marked loss of cortical actin filaments, which is associated with the reduced Rac1/PAK activity and increased activity of cofilin, the major actin depolymerizing factor...
June 9, 2015: Cell Reports
https://www.readbyqxmd.com/read/25721396/essential-role-of-glud1-in-dendritic-spine-development-and-glun2b-to-glun2a-nmdar-subunit-switch-in-the-cortex-and-hippocampus-reveals-ability-of-glun2b-inhibition-in-correcting-hyperconnectivity
#3
Subhash C Gupta, Roopali Yadav, Ratnamala Pavuluri, Barbara J Morley, Dustin J Stairs, Shashank M Dravid
The glutamate delta-1 (GluD1) receptor is highly expressed in the forebrain. We have previously shown that loss of GluD1 leads to social and cognitive deficits in mice, however, its role in synaptic development and neurotransmission remains poorly understood. Here we report that GluD1 is enriched in the medial prefrontal cortex (mPFC) and GluD1 knockout mice exhibit a higher dendritic spine number, greater excitatory neurotransmission as well as higher number of synapses in mPFC. In addition abnormalities in the LIMK1-cofilin signaling, which regulates spine dynamics, and a lower ratio of GluN2A/GluN2B expression was observed in the mPFC in GluD1 knockout mice...
June 2015: Neuropharmacology
https://www.readbyqxmd.com/read/25394486/oligomeric-a%C3%AE-induced-synaptic-dysfunction-in-alzheimer-s-disease
#4
REVIEW
Shichun Tu, Shu-ichi Okamoto, Stuart A Lipton, Huaxi Xu
Alzheimer's disease (AD) is a devastating disease characterized by synaptic and neuronal loss in the elderly. Compelling evidence suggests that soluble amyloid-β peptide (Aβ) oligomers induce synaptic loss in AD. Aβ-induced synaptic dysfunction is dependent on overstimulation of N-methyl-D-aspartate receptors (NMDARs) resulting in aberrant activation of redox-mediated events as well as elevation of cytoplasmic Ca2+, which in turn triggers downstream pathways involving phospho-tau (p-tau), caspases, Cdk5/dynamin-related protein 1 (Drp1), calcineurin/PP2B, PP2A, Gsk-3β, Fyn, cofilin, and CaMKII and causes endocytosis of AMPA receptors (AMPARs) as well as NMDARs...
2014: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/25297090/a%C3%AE-selectively-impairs-mglur7-modulation-of-nmda-signaling-in-basal-forebrain-cholinergic-neurons-implication-in-alzheimer-s-disease
#5
Zhenglin Gu, Jia Cheng, Ping Zhong, Luye Qin, Wenhua Liu, Zhen Yan
Degeneration of basal forebrain (BF) cholinergic neurons is one of the early pathological events in Alzheimer's disease (AD) and is thought to be responsible for the cholinergic and cognitive deficits in AD. The functions of this group of neurons are highly influenced by glutamatergic inputs from neocortex. We found that activation of metabotropic glutamate receptor 7 (mGluR7) decreased NMDAR-mediated currents and NR1 surface expression in rodent BF neurons via a mechanism involving cofilin-regulated actin dynamics...
October 8, 2014: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/24089484/shank3-deficiency-induces-nmda-receptor-hypofunction-via-an-actin-dependent-mechanism
#6
Lara J Duffney, Jing Wei, Jia Cheng, Wenhua Liu, Katharine R Smith, Josef T Kittler, Zhen Yan
Shank3, which encodes a scaffolding protein at glutamatergic synapses, is a genetic risk factor for autism. In this study, we examined the impact of Shank3 deficiency on the NMDA-type glutamate receptor, a key player in cognition and mental illnesses. We found that knockdown of Shank3 with a small interfering RNA (siRNA) caused a significant reduction of NMDAR-mediated ionic or synaptic current, as well as the surface expression of NR1 subunits, in rat cortical cultures. The effect of Shank3 siRNA on NMDAR currents was blocked by an actin stabilizer, and was occluded by an actin destabilizer, suggesting the involvement of actin cytoskeleton...
October 2, 2013: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/23765104/spin90-dephosphorylation-is-required-for-cofilin-mediated-actin-depolymerization-in-nmda-stimulated-hippocampal-neurons
#7
In Ha Cho, Min Jung Lee, Dae Hwan Kim, Bora Kim, Jeomil Bae, Kyu Yeong Choi, Seon-Myung Kim, Yun Hyun Huh, Kun Ho Lee, Chong-Hyun Kim, Woo Keun Song
Actin plays a fundamental role in the regulation of spine morphology (both shrinkage and enlargement) upon synaptic activation. In particular, actin depolymerization is crucial for the spine shrinkage in NMDAR-mediated synaptic depression. Here, we define the role of SPIN90 phosphorylation/dephosphorylation in regulating actin depolymerization via modulation of cofilin activity. When neurons were treated with NMDA, SPIN90 was dephosphorylated by STEP61 (striatal-enriched protein tyrosine phosphatase) and translocated from the spines to the dendritic shafts...
November 2013: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/23153583/molecular-mechanisms-coordinating-functional-and-morphological-plasticity-at-the-synapse-role-of-glua2-n-cadherin-interaction-mediated-actin-signaling-in-mglur-dependent-ltd
#8
REVIEW
Suhail Asrar, Zhengping Jia
Long-lasting synaptic plasticity involves changes in both synaptic morphology and electrical signaling (here referred to as structural and functional plasticity). Recent studies have revealed a myriad of molecules and signaling processes that are critical for each of these two forms of plasticity, but whether and how they are mechanistically linked to achieve coordinated changes remain controversial. It is well accepted that functional plasticity at the excitatory synapse is dependent upon the activities of glutamate receptors...
February 2013: Cellular Signalling
https://www.readbyqxmd.com/read/22308427/cofilin-under-control-of-%C3%AE-arrestin-2-in-nmda-dependent-dendritic-spine-plasticity-long-term-depression-ltd-and-learning
#9
Crystal G Pontrello, Min-Yu Sun, Alice Lin, Todd A Fiacco, Kathryn A DeFea, Iryna M Ethell
Dendritic spines are dynamic, actin-rich structures that form the postsynaptic sites of most excitatory synapses in the brain. The F-actin severing protein cofilin has been implicated in the remodeling of dendritic spines and synapses under normal and pathological conditions, by yet unknown mechanisms. Here we report that β-arrestin-2 plays an important role in NMDA-induced remodeling of dendritic spines and synapses via translocation of active cofilin to dendritic spines. NMDAR activation triggers cofilin activation through calcineurin and phosphatidylinositol 3-kinase (PI3K)-mediated dephosphorylation and promotes cofilin translocation to dendritic spines that is mediated by β-arrestin-2...
February 14, 2012: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/22287544/regulation-of-n-methyl-d-aspartic-acid-nmda-receptors-by-metabotropic-glutamate-receptor-7
#10
Zhenglin Gu, Wenhua Liu, Jing Wei, Zhen Yan
Emerging evidence suggests that metabotropic glutamate receptors (mGluRs) are potential novel targets for brain disorders associated with the dysfunction of prefrontal cortex (PFC), a region critical for cognitive and emotional processes. Because N-methyl-D-aspartic acid receptor (NMDAR) dysregulation has been strongly associated with the pathophysiology of mental illnesses, we examined the possibility that mGluRs might be involved in modulating PFC functions by targeting postsynaptic NMDARs. We found that application of prototypical group III mGluR agonists significantly reduced NMDAR-mediated synaptic and ionic currents in PFC pyramidal neurons, which was mediated by mGluR7 localized at postsynaptic neurons and involved the β-arrestin/ERK signaling pathway...
March 23, 2012: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/19770351/phosphatidylinositol-4-5-bisphosphate-regulation-of-n-methyl-d-aspartate-receptor-channels-in-cortical-neurons
#11
Madhuchhanda Mandal, Zhen Yan
The membrane phospholipid phosphatidylinositol (4,5)-bisphosphate (PIP(2)) has been implicated in the regulation of several ion channels and transporters. In this study, we examined the impact of PIP(2) on N-methyl-D-aspartate receptors (NMDARs) in cortical neurons. Blocking PIP(2) synthesis by inhibiting phosphoinositide-4 kinase, or stimulating PIP(2) hydrolysis via activation of phospholipase C (PLC), or blocking PIP(2) function with an antibody caused a significant reduction of NMDAR-mediated currents. On the other hand, inhibition of PLC or application of PIP(2) caused an enhancement of NMDAR currents...
December 2009: Molecular Pharmacology
https://www.readbyqxmd.com/read/17360908/natural-oligomers-of-the-alzheimer-amyloid-beta-protein-induce-reversible-synapse-loss-by-modulating-an-nmda-type-glutamate-receptor-dependent-signaling-pathway
#12
COMPARATIVE STUDY
Ganesh M Shankar, Brenda L Bloodgood, Matthew Townsend, Dominic M Walsh, Dennis J Selkoe, Bernardo L Sabatini
Alzheimer's disease (AD) is characterized by decreased synapse density in hippocampus and neocortex, and synapse loss is the strongest anatomical correlate of the degree of clinical impairment. Although considerable evidence supports a causal role for the amyloid-beta protein (Abeta) in AD, a direct link between a specific form of Abeta and synapse loss has not been established. We demonstrate that physiological concentrations of naturally secreted Abeta dimers and trimers, but not monomers, induce progressive loss of hippocampal synapses...
March 14, 2007: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/16025109/distinct-triggering-and-expression-mechanisms-underlie-ltd-of-ampa-and-nmda-synaptic-responses
#13
Wade Morishita, Helene Marie, Robert C Malenka
Although long-term depression (LTD) of AMPA receptor-mediated postsynaptic currents (AMPAR EPSCs) has been extensively examined, little is known about the mechanisms responsible for LTD of NMDA receptor (NMDAR)-mediated EPSCs. Here we show differences in the intracellular signaling cascades that mediate LTD of AMPAR EPSCs versus NMDAR EPSCs in rat hippocampus. Both forms of LTD were blocked by inhibitors of protein phosphatase 1, but only LTD of AMPAR EPSCs was affected by inhibition of calcineurin. Notably, in contrast to LTD of AMPAR EPSCs, LTD of NMDAR EPSCs was unaffected by endocytosis inhibitors...
August 2005: Nature Neuroscience
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