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Huang M, Pieraut S, Cao J, de Souza Polli F, Roncace V, Shen G, Ramos-Medina C, Lee H, Maximov A. Nr4a1 regulates cell-specific transcriptional programs in inhibitory GABAergic interneurons. Neuron 2024:S0896-6273(24)00196-X. [PMID: 38754414 DOI: 10.1016/j.neuron.2024.03.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 01/29/2024] [Accepted: 03/14/2024] [Indexed: 05/18/2024]
Abstract
The patterns of synaptic connectivity and physiological properties of diverse neuron types are shaped by distinct gene sets. Our study demonstrates that, in the mouse forebrain, the transcriptional profiles of inhibitory GABAergic interneurons are regulated by Nr4a1, an orphan nuclear receptor whose expression is transiently induced by sensory experiences and is required for normal learning. Nr4a1 exerts contrasting effects on the local axonal wiring of parvalbumin- and somatostatin-positive interneurons, which innervate different subcellular domains of their postsynaptic partners. The loss of Nr4a1 activity in these interneurons results in bidirectional, cell-type-specific transcriptional switches across multiple gene families, including those involved in surface adhesion and repulsion. Our findings reveal that combinatorial synaptic organizing codes are surprisingly flexible and highlight a mechanism by which inducible transcription factors can influence neural circuit structure and function.
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Affiliation(s)
- Min Huang
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA; The Kellogg School of Science and Technology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Simon Pieraut
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Jasmine Cao
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Filip de Souza Polli
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Vincenzo Roncace
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Gloria Shen
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Carlos Ramos-Medina
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - HeeYang Lee
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA; The Kellogg School of Science and Technology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Anton Maximov
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA.
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Uytiepo M, Zhu Y, Bushong E, Polli F, Chou K, Zhao E, Kim C, Luu D, Chang L, Quach T, Haberl M, Patapoutian L, Beutter E, Zhang W, Dong B, McCue E, Ellisman M, Maximov A. Synaptic architecture of a memory engram in the mouse hippocampus. bioRxiv 2024:2024.04.23.590812. [PMID: 38712256 PMCID: PMC11071366 DOI: 10.1101/2024.04.23.590812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Memory engrams are formed through experience-dependent remodeling of neural circuits, but their detailed architectures have remained unresolved. Using 3D electron microscopy, we performed nanoscale reconstructions of the hippocampal CA3-CA1 pathway following chemogenetic labeling of cellular ensembles with a remote history of correlated excitation during associative learning. Projection neurons involved in memory acquisition expanded their connectomes via multi-synaptic boutons without altering the numbers and spatial arrangements of individual axonal terminals and dendritic spines. This expansion was driven by presynaptic activity elicited by specific negative valence stimuli, regardless of the co-activation state of postsynaptic partners. The rewiring of initial ensembles representing an engram coincided with local, input-specific changes in the shapes and organelle composition of glutamatergic synapses, reflecting their weights and potential for further modifications. Our findings challenge the view that the connectivity among neuronal substrates of memory traces is governed by Hebbian mechanisms, and offer a structural basis for representational drifts.
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Yang D, Wang Y, Qi T, Zhang X, Shen L, Ma J, Pang Z, Lal NK, McClatchy DB, Seradj SH, Leung VH, Wang K, Xie Y, Polli FS, Maximov A, Gonzalez OC, de Lecea L, Cline HT, Augustine V, Yates JR, Ye L. Phosphorylation of pyruvate dehydrogenase inversely associates with neuronal activity. Neuron 2024; 112:959-971.e8. [PMID: 38266644 PMCID: PMC11021214 DOI: 10.1016/j.neuron.2023.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 08/24/2023] [Accepted: 12/21/2023] [Indexed: 01/26/2024]
Abstract
For decades, the expression of immediate early genes (IEGs) such as FOS has been the most widely used molecular marker representing neuronal activation. However, to date, there is no equivalent surrogate available for the decrease of neuronal activity. Here, we developed an optogenetic-based biochemical screen in which population neural activities can be controlled by light with single action potential precision, followed by unbiased phosphoproteomic profiling. We identified that the phosphorylation of pyruvate dehydrogenase (pPDH) inversely correlated with the intensity of action potential firing in primary neurons. In in vivo mouse models, monoclonal antibody-based pPDH immunostaining detected activity decreases across the brain, which were induced by a wide range of factors including general anesthesia, chemogenetic inhibition, sensory experiences, and natural behaviors. Thus, as an inverse activity marker (IAM) in vivo, pPDH can be used together with IEGs or other cell-type markers to profile and identify bi-directional neural dynamics induced by experiences or behaviors.
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Affiliation(s)
- Dong Yang
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Yu Wang
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Tianbo Qi
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Xi Zhang
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Leyao Shen
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Jingrui Ma
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA; Department of Neurobiology, University of California San Diego, La Jolla, CA 92093, USA
| | - Zhengyuan Pang
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Neeraj K Lal
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Daniel B McClatchy
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Saba Heydari Seradj
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Verina H Leung
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Kristina Wang
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Yi Xie
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Filip S Polli
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Anton Maximov
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | | | - Luis de Lecea
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94305, USA
| | - Hollis T Cline
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Vineet Augustine
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA; Department of Neurobiology, University of California San Diego, La Jolla, CA 92093, USA
| | - John R Yates
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Li Ye
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA; Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA.
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Samoilov V, Lavrentev V, Sultanova M, Ramazanov D, Kozhevnikov A, Shandryuk G, Kniazeva M, Maximov A. Methyl and Ethyl Ethers of Glycerol as Potential Green Low-Melting Technical Fluids. Molecules 2023; 28:7483. [PMID: 38005206 PMCID: PMC10672826 DOI: 10.3390/molecules28227483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/01/2023] [Accepted: 11/01/2023] [Indexed: 11/26/2023] Open
Abstract
The study is dedicated to the consideration of lower alkyl ethers of glycerol as potential components of low-melting technical fluids (e.g., heat transfer fluids, hydraulic fluids, aircraft de-icing fluids, etc.). Four isomeric mixtures of glycerol ethers (GMME-monomethyl; GDME-dimethyl; GMEE-monoethyl; GDEE-diethyl) were synthesized from epichlorohydrin and methanol/ethanol in the presence of sodium and subjected to detailed characterization as pure compounds and as aqueous solutions (30-90 vol%). The temperature and concentration dependencies of density, viscosity, cloud point, boiling range, specific heat capacity, thermal conductivity, and rubber swelling were obtained. On the basis of the data obtained, a comparison was made between the aqueous solutions of glycerol ethers and of other common bases for low-melting liquids (glycerol, ethylene glycol, and propylene glycol). Pure glycerol ethers could potentially be used as technical fluids in a very wide temperature range-from -114 to 150 °C. It was further demonstrated that in low temperature applications (e.g., in low-temperature chiller systems) the glycerol-ether-based aqueous heat transfer fluids could provide enhanced efficiency when compared to the glycerol- or propylene-glycol-based ones due to their lower viscosities and favorable environmental properties.
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Affiliation(s)
- Vadim Samoilov
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Prospect, 119991 Moscow, Russia; (V.L.); (M.S.); (D.R.); (M.K.); (A.M.)
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Golubeva M, Mukhtarova M, Sadovnikov A, Maximov A. PET Waste Recycling into BTX Fraction Using In Situ Obtained Nickel Phosphide. Polymers (Basel) 2023; 15:polym15102248. [PMID: 37242823 DOI: 10.3390/polym15102248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 05/06/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
The annual production of plastic waste is a serious ecological problem as it causes substantial pollution of the environment. Polyethylene terephthalate, a material usually found in disposable plastic bottles, is one of the most popular material used for packaging in the world. In this paper, it is proposed to recycle polyethylene terephthalate waste bottles into benzene-toluene-xylene fraction using a heterogeneous nickel phosphide catalyst formed in situ during the polyethylene terephthalate recycling process. The catalyst obtained was characterized using powder X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy techniques. The catalyst was shown to contain a Ni2P phase. Its activity was studied in a temperature range of 250-400 °C and a H2 pressure range of 5-9 MPa. The highest selectivity for benzene-toluene-xylene fraction was 93% at quantitative conversion.
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Affiliation(s)
- Maria Golubeva
- A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences (TIPS RAS), Moscow 119991, Russia
| | - Mariyam Mukhtarova
- A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences (TIPS RAS), Moscow 119991, Russia
| | - Alexey Sadovnikov
- A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences (TIPS RAS), Moscow 119991, Russia
| | - Anton Maximov
- A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences (TIPS RAS), Moscow 119991, Russia
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6
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Yang D, Wang Y, Qi T, Zhang X, Shen L, Ma J, Pang Z, Lal NK, McClatchy DB, Wang K, Xie Y, Polli F, Maximov A, Augustine V, Cline HT, Yates JR, Ye L. Phosphorylation of pyruvate dehydrogenase marks the inhibition of in vivo neuronal activity. bioRxiv 2023:2023.03.13.532494. [PMID: 36993270 PMCID: PMC10054949 DOI: 10.1101/2023.03.13.532494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
For decades, the expression of immediate early genes (IEGs) such as c- fos has been the most widely used molecular marker representing neuronal activation. However, to date, there is no equivalent surrogate available for the decrease of neuronal activity (i.e., inhibition). Here, we developed an optogenetic-based biochemical screen in which population neural activities can be controlled by light with single action potential precision, followed by unbiased phosphoproteomic profiling. We identified that the phosphorylation of pyruvate dehydrogenase (pPDH) inversely correlated with the intensity of action potential firing in primary neurons. In in vivo mouse models, monoclonal antibody-based pPDH immunostaining detected neuronal inhibition across the brain induced by a wide range of factors including general anesthesia, sensory experiences, and natural behaviors. Thus, as an in vivo marker for neuronal inhibition, pPDH can be used together with IEGs or other cell-type markers to profile and identify bi-directional neural dynamics induced by experiences or behaviors.
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7
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Schiapparelli LM, Xie Y, Sharma P, McClatchy DB, Ma Y, Yates JR, Maximov A, Cline HT. Activity-Induced Cortical Glutamatergic Neuron Nascent Proteins. J Neurosci 2022; 42:7900-7920. [PMID: 36261270 PMCID: PMC9617616 DOI: 10.1523/jneurosci.0707-22.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/26/2022] [Accepted: 08/30/2022] [Indexed: 11/21/2022] Open
Abstract
Neuronal activity initiates signaling cascades that culminate in diverse outcomes including structural and functional neuronal plasticity, and metabolic changes. While studies have revealed activity-dependent neuronal cell type-specific transcriptional changes, unbiased quantitative analysis of cell-specific activity-induced dynamics in newly synthesized proteins (NSPs) synthesis in vivo has been complicated by cellular heterogeneity and a relatively low abundance of NSPs within the proteome in the brain. Here we combined targeted expression of mutant MetRS (methionine tRNA synthetase) in genetically defined cortical glutamatergic neurons with tight temporal control of treatment with the noncanonical amino acid, azidonorleucine, to biotinylate NSPs within a short period after pharmacologically induced seizure in male and female mice. By purifying peptides tagged with heavy or light biotin-alkynes and using direct tandem mass spectrometry detection of biotinylated peptides, we quantified activity-induced changes in cortical glutamatergic neuron NSPs. Seizure triggered significant changes in ∼300 NSPs, 33% of which were decreased by seizure. Proteins mediating excitatory and inhibitory synaptic plasticity, including SynGAP1, Pak3, GEPH1, Copine-6, and collybistin, and DNA and chromatin remodeling proteins, including Rad21, Smarca2, and Ddb1, are differentially synthesized in response to activity. Proteins likely to play homeostatic roles in response to activity, such as regulators of proteastasis, intracellular ion control, and cytoskeleton remodeling proteins, are activity induced. Conversely, seizure decreased newly synthetized NCAM, among others, suggesting that seizure induced degradation. Overall, we identified quantitative changes in the activity-induced nascent proteome from genetically defined cortical glutamatergic neurons as a strategy to discover downstream mediators of neuronal plasticity and generate hypotheses regarding their function.SIGNIFICANCE STATEMENT Activity-induced neuronal and synaptic plasticity are mediated by changes in the protein landscape, including changes in the activity-induced newly synthesized proteins; however, identifying neuronal cell type-specific nascent proteome dynamics in the intact brain has been technically challenging. We conducted an unbiased proteomic screen from which we identified significant activity-induced changes in ∼300 newly synthesized proteins in genetically defined cortical glutamatergic neurons within 20 h after pharmacologically induced seizure. Bioinformatic analysis of the dynamic nascent proteome indicates that the newly synthesized proteins play diverse roles in excitatory and inhibitory synaptic plasticity, chromatin remodeling, homeostatic mechanisms, and proteasomal and metabolic functions, extending our understanding of the diversity of plasticity mechanisms.
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Affiliation(s)
- Lucio M Schiapparelli
- Neuroscience Department and Dorris Neuroscience Center, Scripps Research Institute, La Jolla, California 92037
| | - Yi Xie
- Neuroscience Department and Dorris Neuroscience Center, Scripps Research Institute, La Jolla, California 92037
- Skaggs Graduate School, Scripps Research Institute, La Jolla, California 92037
| | - Pranav Sharma
- Neuroscience Department and Dorris Neuroscience Center, Scripps Research Institute, La Jolla, California 92037
- Xosomix, San Diego, California 92121
| | - Daniel B McClatchy
- Department of Molecular Medicine, Scripps Research Institute, La Jolla, California 92037
| | - Yuanhui Ma
- Department of Molecular Medicine, Scripps Research Institute, La Jolla, California 92037
| | - John R Yates
- Department of Molecular Medicine, Scripps Research Institute, La Jolla, California 92037
| | - Anton Maximov
- Neuroscience Department and Dorris Neuroscience Center, Scripps Research Institute, La Jolla, California 92037
| | - Hollis T Cline
- Neuroscience Department and Dorris Neuroscience Center, Scripps Research Institute, La Jolla, California 92037
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Nudell V, Wang Y, Pang Z, Lal NK, Huang M, Shaabani N, Kanim W, Teijaro J, Maximov A, Ye L. HYBRiD: hydrogel-reinforced DISCO for clearing mammalian bodies. Nat Methods 2022; 19:479-485. [PMID: 35347322 PMCID: PMC9337799 DOI: 10.1038/s41592-022-01427-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Accepted: 02/17/2022] [Indexed: 11/08/2022]
Abstract
The recent development of solvent- and polymer-based brain-clearing techniques has advanced our ability to visualize the mammalian nervous system in three dimensions. However, it remains challenging to image the mammalian body en bloc. Here we developed HYBRiD (hydrogel-based reinforcement of three-dimensional imaging solvent-cleared organs (DISCO)), by recombining components of organic- and polymer-based clearing pipelines. We achieved high transparency and protein retention, as well as compatibility with direct fluorescent imaging and immunostaining in cleared mammalian bodies. Using parvalbumin- and somatostatin-Cre models, we demonstrated the utility of HYBRiD for whole-body imaging of genetically encoded fluorescent reporters without antibody enhancement of signals in newborn and juvenile mice. Using K18-hACE2 transgenic mice, HYBRiD enabled perfusion-free clearing and visualization of SARS-CoV-2 infection in a whole mouse chest, revealing macroscopic and microscopic features of viral pathology in the same sample. HYBRiD offers a simple and universal solution to visualize large heterogeneous body parts or entire animals for basic and translational research.
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Affiliation(s)
- Victoria Nudell
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA, USA
| | - Yu Wang
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA, USA
| | - Zhengyuan Pang
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA, USA
| | - Neeraj K Lal
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA, USA
| | - Min Huang
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA, USA
| | - Namir Shaabani
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA, USA
| | - Wesam Kanim
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA, USA
| | - John Teijaro
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA, USA
| | - Anton Maximov
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA, USA
| | - Li Ye
- Department of Neuroscience, The Scripps Research Institute, La Jolla, CA, USA.
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA.
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Karakhanov E, Maximov A, Zolotukhina A. Heterogeneous Dendrimer-Based Catalysts. Polymers (Basel) 2022; 14:polym14050981. [PMID: 35267800 PMCID: PMC8912888 DOI: 10.3390/polym14050981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 02/22/2022] [Accepted: 02/23/2022] [Indexed: 02/04/2023] Open
Abstract
The present review compiles the advances in the dendritic catalysis within the last two decades, in particular concerning heterogeneous dendrimer-based catalysts and their and application in various processes, such as hydrogenation, oxidation, cross-coupling reactions, etc. There are considered three main approaches to the synthesis of immobilized heterogeneous dendrimer-based catalysts: (1) impregnation/adsorption on silica or carbon carriers; (2) dendrimer covalent grafting to various supports (silica, polystyrene, carbon nanotubes, porous aromatic frameworks, etc.), which may be performed in a divergent (as a gradual dendron growth on the support) or convergent way (as a grafting of whole dendrimer to the support); and (3) dendrimer cross-linking, using transition metal ions (resulting in coordination polymer networks) or bifunctional organic linkers, whose size, polarity, and rigidity define the properties of the resulted material. Additionally, magnetically separable dendritic catalysts, which can be synthesized using the three above-mentioned approaches, are also considered. Dendritic catalysts, synthesized in such ways, can be stored as powders and be easily separated from the reaction medium by filtration/centrifugation as traditional heterogeneous catalysts, maintaining efficiency as for homogeneous dendritic catalysts.
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Affiliation(s)
- Eduard Karakhanov
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991 Moscow, Russia;
| | - Anton Maximov
- Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia;
| | - Anna Zolotukhina
- Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia;
- Correspondence:
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Makeeva D, Kulikov L, Zolotukhina A, Maximov A, Karakhanov E. Functionalization strategy influences the porosity of amino-containing porous aromatic frameworks and the hydrogenation activity of palladium catalysts synthesized on their basis. Molecular Catalysis 2022. [DOI: 10.1016/j.mcat.2021.112012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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11
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Shimojo M, Ono M, Takuwa H, Mimura K, Nagai Y, Fujinaga M, Kikuchi T, Okada M, Seki C, Tokunaga M, Maeda J, Takado Y, Takahashi M, Minamihisamatsu T, Zhang M, Tomita Y, Suzuki N, Maximov A, Suhara T, Minamimoto T, Sahara N, Higuchi M. A genetically targeted reporter for PET imaging of deep neuronal circuits in mammalian brains. EMBO J 2021; 40:e107757. [PMID: 34636430 PMCID: PMC8591537 DOI: 10.15252/embj.2021107757] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Revised: 08/24/2021] [Accepted: 08/31/2021] [Indexed: 01/27/2023] Open
Abstract
Positron emission tomography (PET) allows biomolecular tracking but PET monitoring of brain networks has been hampered by a lack of suitable reporters. Here, we take advantage of bacterial dihydrofolate reductase, ecDHFR, and its unique antagonist, TMP, to facilitate in vivo imaging in the brain. Peripheral administration of radiofluorinated and fluorescent TMP analogs enabled PET and intravital microscopy, respectively, of neuronal ecDHFR expression in mice. This technique can be used to the visualize neuronal circuit activity elicited by chemogenetic manipulation in the mouse hippocampus. Notably, ecDHFR-PET allows mapping of neuronal projections in non-human primate brains, demonstrating the applicability of ecDHFR-based tracking technologies for network monitoring. Finally, we demonstrate the utility of TMP analogs for PET studies of turnover and self-assembly of proteins tagged with ecDHFR mutants. These results establish opportunities for a broad spectrum of previously unattainable PET analyses of mammalian brain circuits at the molecular level.
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Affiliation(s)
- Masafumi Shimojo
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Maiko Ono
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Hiroyuki Takuwa
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Koki Mimura
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Yuji Nagai
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Masayuki Fujinaga
- Department of Radiopharmaceuticals DevelopmentNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Tatsuya Kikuchi
- Department of Radiopharmaceuticals DevelopmentNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Maki Okada
- Department of Radiopharmaceuticals DevelopmentNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Chie Seki
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Masaki Tokunaga
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Jun Maeda
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Yuhei Takado
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Manami Takahashi
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Takeharu Minamihisamatsu
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Ming‐Rong Zhang
- Department of Radiopharmaceuticals DevelopmentNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Yutaka Tomita
- Department of NeurologyKeio University School of MedicineTokyoJapan
| | - Norihiro Suzuki
- Department of NeurologyKeio University School of MedicineTokyoJapan
| | - Anton Maximov
- Department of NeuroscienceThe Scripps Research InstituteLa JollaCAUSA
| | - Tetsuya Suhara
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Takafumi Minamimoto
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Naruhiko Sahara
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Makoto Higuchi
- Department of Functional Brain ImagingNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
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12
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Nenasheva M, Gorbunov D, Karasaeva M, Maximov A, Karakhanov E. Non-phosphorus recyclable Rh/triethanolamine catalytic system for tandem hydroformylation/hydrogenation and hydroaminomethylation of olefins under biphasic conditions. Molecular Catalysis 2021. [DOI: 10.1016/j.mcat.2021.112010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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Glotov A, Demikhova N, Rubtsova M, Melnikov D, Tsaplin D, Gushchin P, Egazar’yants S, Maximov A, Karakhanov E, Vinokurov V. Bizeolite Pt/ZSM-5:ZSM-12/Al2O3 catalyst for hydroisomerization of C-8 fraction with various ethylbenzene content. Catal Today 2021. [DOI: 10.1016/j.cattod.2021.02.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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14
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Polli FS, Roncacè V, Maximov A. The multifaceted role of SOCE in central synapses. Cell Calcium 2021; 97:102420. [PMID: 34022471 DOI: 10.1016/j.ceca.2021.102420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Accepted: 05/11/2021] [Indexed: 11/27/2022]
Abstract
Store-operated calcium entry (SOCE) is a mechanism for calcium influx through the plasma membrane in response to release of free calcium from the endoplasmic reticulum. Two recent studies revealed how SOCE regulates the exocytosis of neurotransmitter vesicles at central synapses.
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Affiliation(s)
- Filip Souza Polli
- Department of Neuroscience and The Dorris Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Vincenzo Roncacè
- Department of Neuroscience and The Dorris Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Anton Maximov
- Department of Neuroscience and The Dorris Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA.
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15
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Zhu Y, Uytiepo M, Bushong E, Haberl M, Beutter E, Scheiwe F, Zhang W, Chang L, Luu D, Chui B, Ellisman M, Maximov A. Nanoscale 3D EM reconstructions reveal intrinsic mechanisms of structural diversity of chemical synapses. Cell Rep 2021; 35:108953. [PMID: 33826888 PMCID: PMC8354523 DOI: 10.1016/j.celrep.2021.108953] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 01/21/2021] [Accepted: 03/15/2021] [Indexed: 10/25/2022] Open
Abstract
Chemical synapses of shared cellular origins have remarkably heterogeneous structures, but how this diversity is generated is unclear. Here, we use three-dimensional (3D) electron microscopy and artificial intelligence algorithms for image processing to reconstruct functional excitatory microcircuits in the mouse hippocampus and microcircuits in which neurotransmitter signaling is permanently suppressed with genetic tools throughout the lifespan. These nanoscale analyses reveal that experience is dispensable for morphogenesis of synapses with different geometric shapes and contents of membrane organelles and that arrangement of morphologically distinct connections in local networks is stochastic. Moreover, loss of activity increases the variability in sizes of opposed pre- and postsynaptic structures without disrupting their alignments, suggesting that inherently variable weights of naive connections become progressively matched with repetitive use. These results demonstrate that mechanisms for the structural diversity of neuronal synapses are intrinsic and provide insights into how circuits essential for memory storage assemble and integrate information.
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Affiliation(s)
- Yongchuan Zhu
- Department of Neuroscience, The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Marco Uytiepo
- Department of Neuroscience, The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Eric Bushong
- National Center for Microscopy and Imaging Research, University of California, San Diego, CA 92037, USA; Department of Neurosciences, University of California, San Diego, School of Medicine, La Jolla, CA 92037, USA
| | - Matthias Haberl
- National Center for Microscopy and Imaging Research, University of California, San Diego, CA 92037, USA; Department of Neurosciences, University of California, San Diego, School of Medicine, La Jolla, CA 92037, USA
| | - Elizabeth Beutter
- Department of Neuroscience, The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Frederieke Scheiwe
- Department of Neuroscience, The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Weiheng Zhang
- Department of Neuroscience, The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Lyanne Chang
- Department of Neuroscience, The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Danielle Luu
- Department of Neuroscience, The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Brandon Chui
- Department of Neuroscience, The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Mark Ellisman
- National Center for Microscopy and Imaging Research, University of California, San Diego, CA 92037, USA; Department of Neurosciences, University of California, San Diego, School of Medicine, La Jolla, CA 92037, USA.
| | - Anton Maximov
- Department of Neuroscience, The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA.
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16
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Gorbunov D, Nenasheva M, Gorbunov A, Matsukevich R, Maximov A, Karakhanov E. One-pot synthesis of short-chain cyclic acetals via tandem hydroformylation–acetalization under biphasic conditions. REACT CHEM ENG 2021. [DOI: 10.1039/d1re00070e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A novel method of producing short-chain acetals via tandem hydroformylation–acetalization under biphasic conditions is developed.
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Affiliation(s)
- Dmitry Gorbunov
- Department of Petroleum Chemistry and Organic Catalysis
- Faculty of Chemistry
- Moscow State University
- Moscow
- Russia
| | - Maria Nenasheva
- Department of Petroleum Chemistry and Organic Catalysis
- Faculty of Chemistry
- Moscow State University
- Moscow
- Russia
| | - Alexander Gorbunov
- Department of Petroleum Chemistry and Organic Catalysis
- Faculty of Chemistry
- Moscow State University
- Moscow
- Russia
| | - Roman Matsukevich
- Department of Petroleum Chemistry and Organic Catalysis
- Faculty of Chemistry
- Moscow State University
- Moscow
- Russia
| | - Anton Maximov
- Topchiev Institute of Petrochemical Synthesis RAS
- Moscow
- Russia
| | - Eduard Karakhanov
- Department of Petroleum Chemistry and Organic Catalysis
- Faculty of Chemistry
- Moscow State University
- Moscow
- Russia
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17
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Eseva E, Akopyan A, Schepina A, Anisimov A, Maximov A. Deep aerobic oxidative desulfurization of model fuel by Anderson-type polyoxometalate catalysts. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2020.106256] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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18
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Karakhanov E, Maximov A, Terenina M, Vinokurov V, Kulikov L, Makeeva D, Glotov A. Selective hydrogenation of terminal alkynes over palladium nanoparticles within the pores of amino-modified porous aromatic frameworks. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.05.028] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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19
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Karakhanov E, Maximov A, Kulikov L, Makeeva D, Kalinina M, Kardasheva Y, Glotov A. Evaluation of sulfide catalysts performance in hydrotreating of oil fractions using comprehensive gas chromatography time-of-flight mass spectrometry. PURE APPL CHEM 2020. [DOI: 10.1515/pac-2019-1120] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Abstract
In this study, two oil fractions – straight-run diesel and light cycle oil (LCO) – and the products of their hydrotreatment with sulfide catalysts, synthesized in the pores of porous aromatic frameworks, were analyzed by comprehensive two-dimensional gas chromatography (GC) with time of flight mass spectrometry (GC × GC–TOFMS). Effective separation of numerous compounds in the analyzed multicomponent mixtures and high resolution of mass spectra of reaction products made it possible to study the features of the activity of sulfide catalysts.
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Affiliation(s)
- Eduard Karakhanov
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , 119991 , Moscow , Russia
| | - Anton Maximov
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , 119991 , Moscow , Russia
- Institute of Petrochemical Synthesis RAS , 119991 , Moscow , Russia
| | - Leonid Kulikov
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , 119991 , Moscow , Russia
| | - Daria Makeeva
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , 119991 , Moscow , Russia
| | - Maria Kalinina
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , 119991 , Moscow , Russia
| | - Yulia Kardasheva
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , 119991 , Moscow , Russia
| | - Alexander Glotov
- Department of Physical and Colloid Chemistry , Gubkin Russian State University of Oil and Gas , 119991 , Moscow , Russia
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20
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Vutolkina A, Glotov A, Baygildin I, Akopyan A, Talanova M, Terenina M, Maximov A, Karakhanov E. Ni–Mo sulfide nanosized catalysts from water-soluble precursors for hydrogenation of aromatics under water gas shift conditions. PURE APPL CHEM 2020. [DOI: 10.1515/pac-2019-1115] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The unsupported catalysts were obtained during hydrogenation by in situ high-temperature decomposition (above 300 °C) of water-soluble metal precursors (ammonium molybdate and nickel nitrate) in water-in-oil (W/O) emulsions stabilized by surfactant (SPAN-80) using elemental sulfur as sulfiding agent. These self-assembly Ni–Mo sulfide nanosized catalysts were tested in hydrogenation of aromatics under CO pressure in water-containing media for hydrogen generation through a water gas shift reaction (WGSR). The composition of the catalysts was determined by XRF and active sulfide phase was revealed by XRD, TEM and XPS techniques. The calculations based on TEM and XPS data showed that the catalysts are highly dispersed. The surfactant was found to affect both dispersion and metal distribution for Ni and Mo species, providing shorter slab length in terms of sulfide particle formation and stacking within high content of NiMoS phase. Catalytic evaluation in hydrogenation of aromatics was performed in a high-pressure batch reactor at T = 380–420 °С, p(CO) = 5 MPa with water content of 20 wt.% and CO/H2O molar ratio of 1.8 for 4–8 h. As shown experimentally with unsupported Ni–Mo sulfide catalysts, the activity of aromatic rings depends on the substituent therein and decreases as follows: anthracene>>1-methylnaphthalene≈2-methylnaphthalene>1,8-dimethylnaphthale-ne>>1,3-di-methylnaphthalene>2,6-dimethylnaphthalene≈2,3-dimethylnaphthalene>2-ethyl-naphthalene. The anthracene conversion reaches up to 97–100% for 4 h over the whole temperature range, while for 1MN and 2MN it doesn’t exceed 92 and 86% respectively even at 420 °С for 8 h. Among dimethyl-substituted aromatics the higher conversion of 45% was achieved for 1,8-dimethylnaphthalene with 100% selectivity to tetralines at 400 °С for 6 h. Similar to 1- and 2-methylnaphtalenes, the hydrogenation of asymmetric dimethyl-substituted substrate carries out through the unsubstituted aromatic ring indicating that steric factors influence on the sorption mechanism over active metal sites. The catalysts were found to be reused for at least six cycles when the hydrogenation is sulfur-assisted preventing metal oxide formation. It was established, that at the first 2–3 h known as the induction period, the oxide catalyst precursors formed slowly by metal salt decomposition, which reveals that it is the rate-determining step. The sulfidation is rather fast based on high catalytic activity data on 2MN conversion retaining at 93–95% upon recycling.
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Affiliation(s)
- Anna Vutolkina
- Faculty of Chemistry, Department of Petroleum Chemistry and Organic Catalysis , Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory, 119991 , Moscow , Russia
| | - Aleksandr Glotov
- Faculty of Chemistry, Department of Petroleum Chemistry and Organic Catalysis , Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory, 119991 , Moscow , Russia
- Faculty of Chemical and Environmental Engineering, Department of Physical and Colloid Chemistry , Gubkin Russian State University of Oil and Gas (NRU) , 65 Leninsky Prospekt, 119991 , Moscow , Russia
| | - Ilnur Baygildin
- Faculty of Chemistry, Department of Petroleum Chemistry and Organic Catalysis , Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory, 119991 , Moscow , Russia
| | - Argam Akopyan
- Faculty of Chemistry, Department of Petroleum Chemistry and Organic Catalysis , Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory, 119991 , Moscow , Russia
| | - Marta Talanova
- Faculty of Chemistry, Department of Petroleum Chemistry and Organic Catalysis , Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory, 119991 , Moscow , Russia
| | - Maria Terenina
- Faculty of Chemistry, Department of Petroleum Chemistry and Organic Catalysis , Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory, 119991 , Moscow , Russia
| | - Anton Maximov
- Faculty of Chemistry, Department of Petroleum Chemistry and Organic Catalysis , Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory, 119991 , Moscow , Russia
- A.V. Topchiev Institute of Petrochemical Synthesis, RAS , GSP-1, 29 Leninsky Prospekt, 119991 , Moscow , Russia
| | - Eduard Karakhanov
- Faculty of Chemistry, Department of Petroleum Chemistry and Organic Catalysis , Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory, 119991 , Moscow , Russia
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21
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Naranov E, Golubev O, Zanaveskin K, Guseva A, Nikulshin P, Kolyagin Y, Maximov A, Karakhanov E. Ni-Based Nanoparticles on Mesoporous Silica Supports for Single-Stage Arsenic and Chlorine Removal during Diesel Fraction Hydrotreating. ACS Omega 2020; 5:6611-6618. [PMID: 32258896 PMCID: PMC7114701 DOI: 10.1021/acsomega.9b04373] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 03/09/2020] [Indexed: 06/11/2023]
Abstract
As- and Cl-containing impurities are highly detrimental to sulfided catalysts in hydrotreating processes. To prevent the irreversible loss of activity of the main sulfide catalysts by As and Cl contaminants, a protective double-layered guard bed catalyst is applied. Two types of mesoporous silica supports (SBA-15 and MCF) were used to obtain sorption-catalytic materials. The high specific surface area of the supports allowed for a significant increase in access to the active catalyst centers. The NiMo/SBA-15/Al2O3 and NiMg/MCF/Al2O3 sorption-catalytic materials demonstrated high activity and stability over 48 h for the simultaneous removal of As and Cl. The catalytic materials allowed for reducing the concentrations of As and Cl to less than 0.1 ppm in the diesel fraction under the following conditions: 5.0 MPa pressure, 2.0 h-1 LHSV, 300 L/L H2-to-substrate volume ratio, and 360 °C.
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Affiliation(s)
- Evgeny Naranov
- Topchiev
Institute of Petrochemical Synthesis, Russian
Academy of Sciences, 119991 Moscow, Russia
| | - Oleg Golubev
- Department
of Chemistry, Moscow State University, 119991 Moscow, Russia
| | - Konstantin Zanaveskin
- Topchiev
Institute of Petrochemical Synthesis, Russian
Academy of Sciences, 119991 Moscow, Russia
| | - Alena Guseva
- All-Russia
Research Institute of Oil Refining JSC (VNII NP JSC), 111116 Moscow, Russia
| | - Pavel Nikulshin
- All-Russia
Research Institute of Oil Refining JSC (VNII NP JSC), 111116 Moscow, Russia
| | - Yury Kolyagin
- Department
of Chemistry, Moscow State University, 119991 Moscow, Russia
| | - Anton Maximov
- Topchiev
Institute of Petrochemical Synthesis, Russian
Academy of Sciences, 119991 Moscow, Russia
- Department
of Chemistry, Moscow State University, 119991 Moscow, Russia
| | - Eduard Karakhanov
- Department
of Chemistry, Moscow State University, 119991 Moscow, Russia
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22
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Karakhanov E, Akopyan A, Golubev O, Anisimov A, Glotov A, Vutolkina A, Maximov A. Alkali Earth Catalysts Based on Mesoporous MCM-41 and Al-SBA-15 for Sulfone Removal from Middle Distillates. ACS Omega 2019; 4:12736-12744. [PMID: 31460396 PMCID: PMC6690565 DOI: 10.1021/acsomega.9b01819] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 07/17/2019] [Indexed: 06/10/2023]
Abstract
Mg, Ca, and Ba catalysts supported on structured mesoporous silica oxides types MCM-41 and Al-SBA-15 were synthesized and investigated in sulfone cracking for sulfur removal from oxidized diesel fuel. Functional materials and catalysts were characterized by low-temperature nitrogen adsorption/desorption, transmission electron microscopy, and inductively coupled plasma atomic emission spectroscopy techniques. Catalytic tests were carried out in fixed-bed and batch reactors with a model compound dibenzothiophene sulfone and oxidized diesel fraction as a feed. MgO/MCM-41 and MgO/Al-MCM-41 possess high activity in sulfone cracking. The sulfur content in the diesel fraction decreases from initial 450 up to 100 ppmw. Catalysts can be regenerated for reuse in several cycles and may be potentially scaled up for industrial applications.
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Affiliation(s)
- Eduard Karakhanov
- Chemistry Department, Lomonosov Moscow
State University, GSP-1, 1-3 Leninskiye Gory, Moscow 119991, Russia
| | - Argam Akopyan
- Chemistry Department, Lomonosov Moscow
State University, GSP-1, 1-3 Leninskiye Gory, Moscow 119991, Russia
| | - Oleg Golubev
- Chemistry Department, Lomonosov Moscow
State University, GSP-1, 1-3 Leninskiye Gory, Moscow 119991, Russia
| | - Alexander Anisimov
- Chemistry Department, Lomonosov Moscow
State University, GSP-1, 1-3 Leninskiye Gory, Moscow 119991, Russia
| | - Aleksandr Glotov
- Chemistry Department, Lomonosov Moscow
State University, GSP-1, 1-3 Leninskiye Gory, Moscow 119991, Russia
- Gubkin Russian
State University of Oil and Gas (National Research University), Leninsky Prospekt 65, Moscow 119991, Russia
| | - Anna Vutolkina
- Chemistry Department, Lomonosov Moscow
State University, GSP-1, 1-3 Leninskiye Gory, Moscow 119991, Russia
| | - Anton Maximov
- Chemistry Department, Lomonosov Moscow
State University, GSP-1, 1-3 Leninskiye Gory, Moscow 119991, Russia
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospekt 29, Moscow 119991, Russia
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23
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Shimojo M, Madara J, Pankow S, Liu X, Yates J, Südhof TC, Maximov A. Synaptotagmin-11 mediates a vesicle trafficking pathway that is essential for development and synaptic plasticity. Genes Dev 2019; 33:365-376. [PMID: 30808661 PMCID: PMC6411015 DOI: 10.1101/gad.320077.118] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 12/21/2018] [Indexed: 11/25/2022]
Abstract
Shimojo et al. show that Synaptotagmin-11 is an essential component of a neuronal vesicular trafficking pathway that differs from the well-characterized synaptic vesicle trafficking pathway but is also essential for life. Synaptotagmin-11 (Syt11) is a Synaptotagmin isoform that lacks an apparent ability to bind calcium, phospholipids, or SNARE proteins. While human genetic studies have linked mutations in the Syt11 gene to schizophrenia and Parkinson's disease, the localization or physiological role of Syt11 remain unclear. We found that in neurons, Syt11 resides on abundant vesicles that differ from synaptic vesicles and resemble trafficking endosomes. These vesicles recycle via the plasma membrane in an activity-dependent manner, but their exocytosis is slow and desynchronized. Constitutive knockout mice lacking Syt11 died shortly after birth, suggesting Syt11-mediated membrane transport is required for survival. In contrast, selective ablation of Syt11 in excitatory forebrain neurons using a conditional knockout did not affect life span but impaired synaptic plasticity and memory. Syt11-deficient neurons displayed normal secretion of fast neurotransmitters and peptides but exhibited a reduction of long-term synaptic potentiation. Hence, Syt11 is an essential component of a neuronal vesicular trafficking pathway that differs from the well-characterized synaptic vesicle trafficking pathway but is also essential for life.
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Affiliation(s)
- Masafumi Shimojo
- Department of Neuroscience, Scripps Research, La Jolla, California 92037, USA.,The Dorris Neuroscience, Scripps Research, La Jolla, California 92037, USA
| | - Joseph Madara
- Department of Neuroscience, Scripps Research, La Jolla, California 92037, USA.,The Dorris Neuroscience, Scripps Research, La Jolla, California 92037, USA
| | - Sandra Pankow
- Department of Molecular Medicine, Scripps Research, La Jolla, California 92037, USA
| | - Xinran Liu
- Department of Neuroscience, University of Texas Southwestern Medical Center at Dallas, Dallas 75235, Texas, USA
| | - John Yates
- Department of Molecular Medicine, Scripps Research, La Jolla, California 92037, USA
| | - Thomas C Südhof
- Department of Neuroscience, University of Texas Southwestern Medical Center at Dallas, Dallas 75235, Texas, USA.,Department of Molecular and Cellular Physiology, Stanford University, Palo Alto, California 94035, USA
| | - Anton Maximov
- Department of Neuroscience, Scripps Research, La Jolla, California 92037, USA.,The Dorris Neuroscience, Scripps Research, La Jolla, California 92037, USA.,Department of Neuroscience, University of Texas Southwestern Medical Center at Dallas, Dallas 75235, Texas, USA
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24
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Gopalaswamy V, Betti R, Knauer JP, Luciani N, Patel D, Woo KM, Bose A, Igumenshchev IV, Campbell EM, Anderson KS, Bauer KA, Bonino MJ, Cao D, Christopherson AR, Collins GW, Collins TJB, Davies JR, Delettrez JA, Edgell DH, Epstein R, Forrest CJ, Froula DH, Glebov VY, Goncharov VN, Harding DR, Hu SX, Jacobs-Perkins DW, Janezic RT, Kelly JH, Mannion OM, Maximov A, Marshall FJ, Michel DT, Miller S, Morse SFB, Palastro J, Peebles J, Radha PB, Regan SP, Sampat S, Sangster TC, Sefkow AB, Seka W, Shah RC, Shmyada WT, Shvydky A, Stoeckl C, Solodov AA, Theobald W, Zuegel JD, Johnson MG, Petrasso RD, Li CK, Frenje JA. Tripled yield in direct-drive laser fusion through statistical modelling. Nature 2019; 565:581-586. [PMID: 30700868 DOI: 10.1038/s41586-019-0877-0] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 12/04/2018] [Indexed: 11/09/2022]
Abstract
Focusing laser light onto a very small target can produce the conditions for laboratory-scale nuclear fusion of hydrogen isotopes. The lack of accurate predictive models, which are essential for the design of high-performance laser-fusion experiments, is a major obstacle to achieving thermonuclear ignition. Here we report a statistical approach that was used to design and quantitatively predict the results of implosions of solid deuterium-tritium targets carried out with the 30-kilojoule OMEGA laser system, leading to tripling of the fusion yield to its highest value so far for direct-drive laser fusion. When scaled to the laser energies of the National Ignition Facility (1.9 megajoules), these targets are predicted to produce a fusion energy output of about 500 kilojoules-several times larger than the fusion yields currently achieved at that facility. This approach could guide the exploration of the vast parameter space of thermonuclear ignition conditions and enhance our understanding of laser-fusion physics.
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Affiliation(s)
- V Gopalaswamy
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA. .,Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA.
| | - R Betti
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA.,Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA.,Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA
| | - J P Knauer
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - N Luciani
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA.,Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA.,Dipartimento di Energetica, Politecnico di Milano, Milan, Italy
| | - D Patel
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA.,Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA
| | - K M Woo
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA.,Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA
| | - A Bose
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA.,Massachusetts Institute of Technology, Cambridge, MA, USA
| | - I V Igumenshchev
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - E M Campbell
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - K S Anderson
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - K A Bauer
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - M J Bonino
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - D Cao
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - A R Christopherson
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA.,Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA
| | - G W Collins
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - T J B Collins
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - J R Davies
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - J A Delettrez
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - D H Edgell
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - R Epstein
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - C J Forrest
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - D H Froula
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - V Y Glebov
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - V N Goncharov
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - D R Harding
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - S X Hu
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - D W Jacobs-Perkins
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - R T Janezic
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - J H Kelly
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - O M Mannion
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA.,Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA
| | - A Maximov
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA.,Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA
| | - F J Marshall
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - D T Michel
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - S Miller
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA.,Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA
| | - S F B Morse
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - J Palastro
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - J Peebles
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - P B Radha
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - S P Regan
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - S Sampat
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - T C Sangster
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - A B Sefkow
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - W Seka
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - R C Shah
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - W T Shmyada
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - A Shvydky
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - A A Solodov
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - W Theobald
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - J D Zuegel
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | - R D Petrasso
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | - C K Li
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | - J A Frenje
- Massachusetts Institute of Technology, Cambridge, MA, USA
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Glotov A, Stavitskaya A, Chudakov Y, Ivanov E, Huang W, Vinokurov V, Zolotukhina A, Maximov A, Karakhanov E, Lvov Y. Mesoporous Metal Catalysts Templated on Clay Nanotubes. BCSJ 2019. [DOI: 10.1246/bcsj.20180207] [Citation(s) in RCA: 84] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Aleksandr Glotov
- Department of Physical and Colloid Chemistry, Gubkin Russian State University of Oil and Gas, 119991, Moscow, Russia
| | - Anna Stavitskaya
- Department of Physical and Colloid Chemistry, Gubkin Russian State University of Oil and Gas, 119991, Moscow, Russia
| | - Yaroslav Chudakov
- Department of Physical and Colloid Chemistry, Gubkin Russian State University of Oil and Gas, 119991, Moscow, Russia
| | - Evgenii Ivanov
- Department of Physical and Colloid Chemistry, Gubkin Russian State University of Oil and Gas, 119991, Moscow, Russia
| | - Wei Huang
- Laboratory of Coal Science and Technology, Taiyuan University of Technology, 030024, Taiyuan, P. R. China
| | - Vladimir Vinokurov
- Department of Physical and Colloid Chemistry, Gubkin Russian State University of Oil and Gas, 119991, Moscow, Russia
| | - Anna Zolotukhina
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991, Moscow, Russia
| | - Anton Maximov
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991, Moscow, Russia
| | - Eduard Karakhanov
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991, Moscow, Russia
| | - Yuri Lvov
- Department of Physical and Colloid Chemistry, Gubkin Russian State University of Oil and Gas, 119991, Moscow, Russia
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, USA
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Kwon SK, Sando R, Lewis TL, Hirabayashi Y, Maximov A, Polleux F. Correction: LKB1 Regulates Mitochondria-Dependent Presynaptic Calcium Clearance and Neurotransmitter Release Properties at Excitatory Synapses along Cortical Axons. PLoS Biol 2018; 16:e3000040. [PMID: 30256781 PMCID: PMC6157833 DOI: 10.1371/journal.pbio.3000040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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27
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Gorbunov D, Safronova D, Kardasheva Y, Maximov A, Rosenberg E, Karakhanov E. New Heterogeneous Rh-Containing Catalysts Immobilized on a Hybrid Organic-Inorganic Surface for Hydroformylation of Unsaturated Compounds. ACS Appl Mater Interfaces 2018; 10:26566-26575. [PMID: 29979868 DOI: 10.1021/acsami.8b02797] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Anchoring Rh complexes to the surface of a silica polyamine composite, which has a poly(allylamine) covalently grafted to the surface of amorphous silica gel, yielded a material that proved to be an effective and novel heterogeneous catalyst for hydroformylation of unsaturated compounds. Surface amino groups of the material were modified with phosphines by covalent and ionic coupling. The modified materials were then treated with Rh(acac)(CO)2, giving the catalysts K-1 and K-2. Catalysts were characterized by solid-state NMR spectroscopy, IR spectroscopy, XPS, TEM, and elemental analysis. The activity and stability of K-1 and K-2 were then studied for the hydroformylation of selected unsaturated compounds. Hydroformylation of terminal double bonds occurred selectively in the presence of internal double bonds. Characterization of the catalysts and the problems encountered with the supported catalysts are discussed. Catalyst K-1 is reusable and can be applied to the hydroformylation of linear olefins, styrene, 4-vinylcyclohexene, and dienes, as well as representative terpenes and other unsaturated hydrocarbons in a batch reactor.
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Affiliation(s)
- Dmitry Gorbunov
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , Moscow 119991 , Russia
| | - Darya Safronova
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , Moscow 119991 , Russia
| | - Yulia Kardasheva
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , Moscow 119991 , Russia
| | - Anton Maximov
- Topchiev Institute of Petrochemical Synthesis , Russian Academy of Sciences , Moscow 119991 , Russia
| | - Edward Rosenberg
- Department of Chemistry and Biochemistry , University of Montana , Missoula , Montana 59812 , United States
| | - Eduard Karakhanov
- Department of Petroleum Chemistry and Organic Catalysis , Moscow State University , Moscow 119991 , Russia
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Vinokurov V, Glotov A, Chudakov Y, Stavitskaya A, Ivanov E, Gushchin P, Zolotukhina A, Maximov A, Karakhanov E, Lvov Y. Core/Shell Ruthenium–Halloysite Nanocatalysts for Hydrogenation of Phenol. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b03282] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vladimir Vinokurov
- Department
of Physical and Colloid Chemistry, Gubkin University, 119991 Moscow, Russian Federation
| | - Aleksandr Glotov
- Department
of Physical and Colloid Chemistry, Gubkin University, 119991 Moscow, Russian Federation
| | - Yaroslav Chudakov
- Department
of Physical and Colloid Chemistry, Gubkin University, 119991 Moscow, Russian Federation
| | - Anna Stavitskaya
- Department
of Physical and Colloid Chemistry, Gubkin University, 119991 Moscow, Russian Federation
| | - Evgenii Ivanov
- Department
of Physical and Colloid Chemistry, Gubkin University, 119991 Moscow, Russian Federation
| | - Pavel Gushchin
- Department
of Physical and Colloid Chemistry, Gubkin University, 119991 Moscow, Russian Federation
| | - Anna Zolotukhina
- Department
of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991, Moscow, Russian Federation
| | - Anton Maximov
- Department
of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991, Moscow, Russian Federation
| | - Eduard Karakhanov
- Department
of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991, Moscow, Russian Federation
| | - Yuri Lvov
- Department
of Physical and Colloid Chemistry, Gubkin University, 119991 Moscow, Russian Federation
- Institute
for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272, United States
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Abstract
AbstractThe paper concerns application of two types of organic materials – porous aromatic frameworks (PAFs) with diamond-like structure and the ordered mesoporous phenol-formaldehyde polymers (MPFs) – as supports for metal and metal sulfide nanoparticles. The obtained hybrid materials were tested in hydrogenation of various unsaturated and aromatic compounds. Ruthenium catalyst, based on PAF (Ru-PAF-30), possessed high activity in exhaustive hydrogenation of phenol into cyclohexanol with TOF value of 2700 h−1. Platinum catalyst, based on modified with sulfo-groups MPF (MPF-SO3H-Pt), was selective in semi-hydrogenation of terpenes, [α-terpinene, γ-terpinene, terpinolene, (s)-limonene]. Bimetallic Ni–W sulfide catalysts, prepared by in situ decomposition of [(n-Bu)4N]2Ni(WS4)2 within the pores of MPFs and PAFs, possessed high efficiency in hydrogenation-hydrocracking of naphthalenes as model substrates.
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Affiliation(s)
- Eduard Karakhanov
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991 Moscow, Russia
| | - Anton Maximov
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991 Moscow, Russia
- Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia
| | - Maksim Boronoev
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991 Moscow, Russia
| | - Leonid Kulikov
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991 Moscow, Russia
| | - Maria Terenina
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991 Moscow, Russia
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Lobanova A, She R, Pieraut S, Clapp C, Maximov A, Denchi EL. Different requirements of functional telomeres in neural stem cells and terminally differentiated neurons. Genes Dev 2017; 31:639-647. [PMID: 28428263 PMCID: PMC5411705 DOI: 10.1101/gad.295402.116] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 03/16/2017] [Indexed: 11/30/2022]
Abstract
Here, Lobanova et al. examine the roles of telomeres at distinct stages of murine brain development by using lineage-specific genetic ablation of TRF2, an essential component of the shelterin complex that protects chromosome ends from the DNA damage response machinery. These results suggest that telomeres are dispensable in terminally differentiated neurons and provide mechanistic insight into cognitive abnormalities associated with aberrant telomere length in humans. Telomeres have been studied extensively in peripheral tissues, but their relevance in the nervous system remains poorly understood. Here, we examine the roles of telomeres at distinct stages of murine brain development by using lineage-specific genetic ablation of TRF2, an essential component of the shelterin complex that protects chromosome ends from the DNA damage response machinery. We found that functional telomeres are required for embryonic and adult neurogenesis, but their uncapping has surprisingly no detectable consequences on terminally differentiated neurons. Conditional knockout of TRF2 in post-mitotic immature neurons had virtually no detectable effect on circuit assembly, neuronal gene expression, and the behavior of adult animals despite triggering massive end-to-end chromosome fusions across the brain. These results suggest that telomeres are dispensable in terminally differentiated neurons and provide mechanistic insight into cognitive abnormalities associated with aberrant telomere length in humans.
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Affiliation(s)
- Anastasia Lobanova
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
| | - Robert She
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
| | - Simon Pieraut
- Department of Neuroscience, The Scripps Research Institute, La Jolla, California 92037, USA
| | - Charlie Clapp
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
| | - Anton Maximov
- Department of Neuroscience, The Scripps Research Institute, La Jolla, California 92037, USA
| | - Eros Lazzerini Denchi
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
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Kwon SK, Sando R, Lewis TL, Hirabayashi Y, Maximov A, Polleux F. LKB1 Regulates Mitochondria-Dependent Presynaptic Calcium Clearance and Neurotransmitter Release Properties at Excitatory Synapses along Cortical Axons. PLoS Biol 2016; 14:e1002516. [PMID: 27429220 PMCID: PMC4948842 DOI: 10.1371/journal.pbio.1002516] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 06/21/2016] [Indexed: 12/24/2022] Open
Abstract
Individual synapses vary significantly in their neurotransmitter release properties, which underlie complex information processing in neural circuits. Presynaptic Ca2+ homeostasis plays a critical role in specifying neurotransmitter release properties, but the mechanisms regulating synapse-specific Ca2+ homeostasis in the mammalian brain are still poorly understood. Using electrophysiology and genetically encoded Ca2+ sensors targeted to the mitochondrial matrix or to presynaptic boutons of cortical pyramidal neurons, we demonstrate that the presence or absence of mitochondria at presynaptic boutons dictates neurotransmitter release properties through Mitochondrial Calcium Uniporter (MCU)-dependent Ca2+ clearance. We demonstrate that the serine/threonine kinase LKB1 regulates MCU expression, mitochondria-dependent Ca2+ clearance, and thereby, presynaptic release properties. Re-establishment of MCU-dependent mitochondrial Ca2+ uptake at glutamatergic synapses rescues the altered neurotransmitter release properties characterizing LKB1-null cortical axons. Our results provide novel insights into the cellular and molecular mechanisms whereby mitochondria control neurotransmitter release properties in a bouton-specific way through presynaptic Ca2+ clearance.
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Affiliation(s)
- Seok-Kyu Kwon
- Columbia University Medical Center, Department of Neuroscience, Mortimer B. Zuckerman Mind Brain Behavior Institute, Kavli Institute for Brain Science, New York, New York, United States of America
| | - Richard Sando
- The Scripps Research Institute, Dorris Neuroscience Center, La Jolla, California, United States of America
| | - Tommy L. Lewis
- Columbia University Medical Center, Department of Neuroscience, Mortimer B. Zuckerman Mind Brain Behavior Institute, Kavli Institute for Brain Science, New York, New York, United States of America
| | - Yusuke Hirabayashi
- Columbia University Medical Center, Department of Neuroscience, Mortimer B. Zuckerman Mind Brain Behavior Institute, Kavli Institute for Brain Science, New York, New York, United States of America
| | - Anton Maximov
- The Scripps Research Institute, Dorris Neuroscience Center, La Jolla, California, United States of America
| | - Franck Polleux
- Columbia University Medical Center, Department of Neuroscience, Mortimer B. Zuckerman Mind Brain Behavior Institute, Kavli Institute for Brain Science, New York, New York, United States of America
- * E-mail:
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Maximov A, Zolotukhina A, Kulikov L, Kardasheva Y, Karakhanov E. Ruthenium catalysts based on mesoporous aromatic frameworks for the hydrogenation of arenes. Reac Kinet Mech Cat 2016. [DOI: 10.1007/s11144-015-0956-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kuklin S, Maximov A, Zolotukhina A, Karakhanov E. New approach for highly selective hydrogenation of phenol to cyclohexanone: Combination of rhodium nanoparticles and cyclodextrins. CATAL COMMUN 2016. [DOI: 10.1016/j.catcom.2015.10.005] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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34
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Maximov A, Zolotukhina A, Murzin V, Karakhanov E, Rosenberg E. Ruthenium Nanoparticles Stabilized in Cross-Linked Dendrimer Matrices: Hydrogenation of Phenols in Aqueous Media. ChemCatChem 2015. [DOI: 10.1002/cctc.201403054] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Pieraut S, Gounko N, Sando R, Dang W, Rebboah E, Panda S, Madisen L, Zeng H, Maximov A. Experience-dependent remodeling of basket cell networks in the dentate gyrus. Neuron 2015; 84:107-122. [PMID: 25277456 DOI: 10.1016/j.neuron.2014.09.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/28/2014] [Indexed: 11/19/2022]
Abstract
The structural organization of neural circuits is strongly influenced by experience, but the underlying mechanisms are incompletely understood. We found that, in the developing dentate gyrus (DG), excitatory drive promotes the somatic innervation of principal granule cells (GCs) by parvalbumin (PV)-positive basket cells. In contrast, presynaptic differentiation of GCs and interneuron subtypes that inhibit GC dendrites is largely resistant to loss of glutamatergic neurotransmission. The networks of PV basket cells in the DG are regulated by vesicular release from projection entorhinal cortical neurons and, at least in part, by NMDA receptors in interneurons. Finally, we present evidence that glutamatergic inputs and NMDA receptors regulate these networks through a presynaptic mechanism that appears to control the branching of interneuron axons. Our results provide insights into how cortical activity tunes the inhibition in a subcortical circuit and reveal new principles of interneuron plasticity.
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Affiliation(s)
- Simon Pieraut
- Department of Molecular and Cellular Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Natalia Gounko
- Department of Molecular and Cellular Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Richard Sando
- Department of Molecular and Cellular Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA; The Kellogg School of Science and Technology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Westley Dang
- Department of Molecular and Cellular Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA; The Kellogg School of Science and Technology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Elisabeth Rebboah
- Department of Molecular and Cellular Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Satchidananda Panda
- Regulatory Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Linda Madisen
- Allen Institute for Brain Science, Seattle, WA 98103, USA
| | - Hongkui Zeng
- Allen Institute for Brain Science, Seattle, WA 98103, USA
| | - Anton Maximov
- Department of Molecular and Cellular Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA; The Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA.
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Kit O, Snezhko A, Maximov A, Kolesnikov E, Trifanov V, Myagkov R, Chizhikov N, Fomenko Y, Kozhushko M. 401. Personalisation approach to surgical treatment of esophageal cancer. European Journal of Surgical Oncology (EJSO) 2014. [DOI: 10.1016/j.ejso.2014.08.391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Soragni E, Miao W, Iudicello M, Jacoby D, De Mercanti S, Clerico M, Longo F, Piga A, Ku S, Campau E, Du J, Penalver P, Rai M, Madara JC, Nazor K, O'Connor M, Maximov A, Loring JF, Pandolfo M, Durelli L, Gottesfeld JM, Rusche JR. Epigenetic therapy for Friedreich ataxia. Ann Neurol 2014; 76:489-508. [PMID: 25159818 PMCID: PMC4361037 DOI: 10.1002/ana.24260] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 08/19/2014] [Accepted: 08/20/2014] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To investigate whether a histone deacetylase inhibitor (HDACi) would be effective in an in vitro model for the neurodegenerative disease Friedreich ataxia (FRDA) and to evaluate safety and surrogate markers of efficacy in a phase I clinical trial in patients. METHODS We used a human FRDA neuronal cell model, derived from patient induced pluripotent stem cells, to determine the efficacy of a 2-aminobenzamide HDACi (109) as a modulator of FXN gene expression and chromatin histone modifications. FRDA patients were dosed in 4 cohorts, ranging from 30mg/day to 240mg/day of the formulated drug product of HDACi 109, RG2833. Patients were monitored for adverse effects as well as for increases in FXN mRNA, frataxin protein, and chromatin modification in blood cells. RESULTS In the neuronal cell model, HDACi 109/RG2833 increases FXN mRNA levels and frataxin protein, with concomitant changes in the epigenetic state of the gene. Chromatin signatures indicate that histone H3 lysine 9 is a key residue for gene silencing through methylation and reactivation through acetylation, mediated by the HDACi. Drug treatment in FRDA patients demonstrated increased FXN mRNA and H3 lysine 9 acetylation in peripheral blood mononuclear cells. No safety issues were encountered. INTERPRETATION Drug exposure inducing epigenetic changes in neurons in vitro is comparable to the exposure required in patients to see epigenetic changes in circulating lymphoid cells and increases in gene expression. These findings provide a proof of concept for the development of an epigenetic therapy for this fatal neurological disease.
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Affiliation(s)
- Elisabetta Soragni
- Departments of Cell and Molecular Biology, Scripps Research Institute, La Jolla, CA
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38
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Karakhanov E, Maximov A, Kardasheva Y, Semernina V, Zolotukhina A, Ivanov A, Abbott G, Rosenberg E, Vinokurov V. Pd nanoparticles in dendrimers immobilized on silica-polyamine composites as catalysts for selective hydrogenation. ACS Appl Mater Interfaces 2014; 6:8807-8816. [PMID: 24766137 DOI: 10.1021/am501528a] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
New heterogeneous hydrogenation catalysts, based on Pd nanoparticles and polypropyleneimine (PPI) dendrimers of the third generation that have been covalently grafted to a silica surface modified with polyallylamine (PAA) have been synthesized. The final products were characterized by TEM, XPS, and solid-state NMR spectroscopy. The synthesized materials are effective catalysts for selective hydrogenation of dienes to monoenes and phenyl acetylene to styrene at very high substrate/Pd ratios with turnover rates higher than related Pd nanoparticle catalysts. The synthesized catalysts can be reused without any loss of activity in the case of styrene and isoprene.
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Affiliation(s)
- Edward Karakhanov
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University , 119991 Moscow, Russia
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Mairet‐Coello G, Courchet J, Pieraut S, Courchet V, Maximov A, Polleux F. P3–077: Inhibition of the CAMKK2‐AMPK‐tau signaling pathway protects hippocampal neurons from beta‐amyloid oligomer–induced synaptotoxicity. Alzheimers Dement 2013. [DOI: 10.1016/j.jalz.2013.05.1147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | - Julien Courchet
- The Scripps Research Institute La Jolla California United States
| | - Simon Pieraut
- The Scripps Research Institute La Jolla California United States
| | | | - Anton Maximov
- The Scripps Research Institute La Jolla California United States
| | - Franck Polleux
- The Scripps Research Institute La Jolla California United States
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Mairet-Coello G, Courchet J, Pieraut S, Courchet V, Maximov A, Polleux F. The CAMKK2-AMPK kinase pathway mediates the synaptotoxic effects of Aβ oligomers through Tau phosphorylation. Neuron 2013; 78:94-108. [PMID: 23583109 DOI: 10.1016/j.neuron.2013.02.003] [Citation(s) in RCA: 266] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/23/2013] [Indexed: 12/25/2022]
Abstract
Amyloid-β 1-42 (Aβ42) oligomers are synaptotoxic for excitatory cortical and hippocampal neurons and might play a role in early stages of Alzheimer's disease (AD) progression. Recent results suggested that Aβ42 oligomers trigger activation of AMP-activated kinase (AMPK), and its activation is increased in the brain of patients with AD. We show that increased intracellular calcium [Ca²⁺](i) induced by NMDA receptor activation or membrane depolarization activates AMPK in a CAMKK2-dependent manner. CAMKK2 or AMPK overactivation is sufficient to induce dendritic spine loss. Conversely, inhibiting their activity protects hippocampal neurons against synaptotoxic effects of Aβ42 oligomers in vitro and against the loss of dendritic spines observed in the human APP(SWE,IND)-expressing transgenic mouse model in vivo. AMPK phosphorylates Tau on KxGS motif S262, and expression of Tau S262A inhibits the synaptotoxic effects of Aβ42 oligomers. Our results identify a CAMKK2-AMPK-Tau pathway as a critical mediator of the synaptotoxic effects of Aβ42 oligomers.
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Affiliation(s)
- Georges Mairet-Coello
- Department of Molecular and Cellular Neuroscience, Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
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41
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Liao L, Sando RC, Farnum JB, Vanderklish PW, Maximov A, Yates JR. 15N-labeled brain enables quantification of proteome and phosphoproteome in cultured primary neurons. J Proteome Res 2011; 11:1341-53. [PMID: 22070516 DOI: 10.1021/pr200987h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Terminally differentiated primary cells represent a valuable in vitro model to study signaling events associated within a specific tissue. Quantitative proteomic methods using metabolic labeling in primary cells encounter labeling efficiency issues hindering the use of these cells. Here we developed a method to quantify the proteome and phosphoproteome of cultured neurons using (15)N-labeled brain tissue as an internal standard and applied this method to determine how an inhibitor of an excitatory neural transmitter receptor, phencyclidine (PCP), affects the global phosphoproteome of cortical neurons. We identified over 10,000 phosphopeptides and made accurate quantitative measurements of the neuronal phosphoproteome after neuronal inhibition. We show that short PCP treatments lead to changes in phosphorylation for 7% of neuronal phosphopeptides and that prolonged PCP treatment alters the total levels of several proteins essential for synaptic transmission and plasticity and leads to a massive reduction in the synaptic strength of inhibitory synapses. The results provide valuable insights into the dynamics of molecular networks implicated in PCP-mediated NMDA receptor inhibition and sensorimotor deficits.
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Affiliation(s)
- Lujian Liao
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, California 92037, United States
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42
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Cao P, Maximov A, Südhof TC. Activity-dependent IGF-1 exocytosis is controlled by the Ca(2+)-sensor synaptotagmin-10. Cell 2011; 145:300-11. [PMID: 21496647 PMCID: PMC3102833 DOI: 10.1016/j.cell.2011.03.034] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Revised: 12/24/2010] [Accepted: 03/07/2011] [Indexed: 10/18/2022]
Abstract
Synaptotagmins Syt1, Syt2, Syt7, and Syt9 act as Ca(2+)-sensors for synaptic and neuroendocrine exocytosis, but the function of other synaptotagmins remains unknown. Here, we show that olfactory bulb neurons secrete IGF-1 by an activity-dependent pathway of exocytosis, and that Syt10 functions as the Ca(2+)-sensor that triggers IGF-1 exocytosis in these neurons. Deletion of Syt10 impaired activity-dependent IGF-1 secretion in olfactory bulb neurons, resulting in smaller neurons and an overall decrease in synapse numbers. Exogenous IGF-1 completely reversed the Syt10 knockout phenotype. Syt10 colocalized with IGF-1 in somatodendritic vesicles of olfactory bulb neurons, and Ca(2+)-binding to Syt10 caused these vesicles to undergo exocytosis, thereby secreting IGF-1. Thus, Syt10 controls a previously unrecognized pathway of Ca(2+)-dependent exocytosis that is spatially and temporally distinct from Ca(2+)-dependent synaptic vesicle exocytosis controlled by Syt1. Our findings thereby reveal that two different synaptotagmins can regulate functionally distinct Ca(2+)-dependent membrane fusion reactions in the same neuron.
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Affiliation(s)
- Peng Cao
- Department of Molecular and Cellular Physiology, and Howard Hughes Medical Institute, Stanford University, 1050 Arastradero Rd., Palo Alto, California 94305, USA
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Karakhanov E, Filippova T, Maximov A, Predeina V, Restakyan A. Two-phase wacker oxidation of alkenes catalyzed by water-soluble macromolecular complexes of palladium. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19981310112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Allen J, Rosenberg E, Karakhanov E, Kardashev SV, Maximov A, Zolotukhina A. Catalytic properties of transition metal salts immobilized on nanoporous silica polyamine composites II: hydrogenation. Appl Organomet Chem 2011. [DOI: 10.1002/aoc.1749] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
Trans-SNAP receptor (SNARE, where SNAP is defined as soluble NSF attachment protein, and NSF is defined as N-ethylmaleimide-sensitive factor) complexes catalyze synaptic vesicle fusion and bind complexin, but the function of complexin binding to SNARE complexes remains unclear. Here we show that in neuronal synapses, complexin simultaneously suppressed spontaneous fusion and activated fast calcium ion-evoked fusion. The dual function of complexin required SNARE binding and also involved distinct amino-terminal sequences of complexin that localize to the point where trans-SNARE complexes insert into the fusing membranes, suggesting that complexin controls the force that trans-SNARE complexes apply onto the fusing membranes. Consistent with this hypothesis, a mutation in the membrane insertion sequence of the v-SNARE synaptobrevin/vesicle-associated membrane protein (VAMP) phenocopied the complexin loss-of-function state without impairing complexin binding to SNARE complexes. Thus, complexin probably activates and clamps the force transfer from assembled trans-SNARE complexes onto fusing membranes.
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Affiliation(s)
- Anton Maximov
- Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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46
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Aggarwal MM, Ahammed Z, Angelis ALS, Antonenko V, Arefiev V, Astakhov V, Avdeitchikov V, Awes TC, Baba PVKS, Badyal SK, Bathe S, Batiounia B, Baumann C, Bernier T, Bhalla KB, Bhatia VS, Blume C, Bucher D, Büsching H, Carlén L, Chattopadhyay S, Decowski MP, Delagrange H, Donni P, Majumdar MRD, El Chenawi K, Dubey AK, Enosawa K, Fokin S, Frolov V, Ganti MS, Garpman S, Gavrishchuk O, Geurts FJM, Ghosh TK, Glasow R, Guskov B, Gustafsson HA, Gutbrod HH, Hrivnacova I, Ippolitov M, Kalechofsky H, Kamermans R, Karadjev K, Karpio K, Kolb BW, Kosarev I, Koutcheryaev I, Kugler A, Kulinich P, Kurata M, Lebedev A, Löhner H, Luquin L, Mahapatra DP, Manko V, Martin M, Martínez G, Maximov A, Miake Y, Mishra GC, Mohanty B, Mora MJ, Morrison D, Mukhanova T, Mukhopadhyay DS, Naef H, Nandi BK, Nayak SK, Nayak TK, Nianine A, Nikitine V, Nikolaev S, Nilsson P, Nishimura S, Nomokonov P, Nystrand J, Oskarsson A, Otterlund I, Pavliouk S, Peitzmann T, Peressounko D, Petracek V, Phatak SC, Pinganaud W, Plasil F, Purschke ML, Rak J, Rammler M, Raniwala R, Raniwala S, Rao NK, Retiere F, Reygers K, Roland G, Rosselet L, Roufanov I, Roy C, Rubio JM, Sambyal SS, Santo R, Sato S, Schlagheck H, Schmidt HR, Schutz Y, Shabratova G, Shah TH, Sibiriak I, Siemiarczuk T, Silvermyr D, Sinha BC, Slavine N, Söderström K, Sood G, Sørensen SP, Stankus P, Stefanek G, Steinberg P, Stenlund E, Sumbera M, Svensson T, Tsvetkov A, Tykarski L, V D Pijll EC, V Eijndhoven N, V Nieuwenhuizen GJ, Vinogradov A, Viyogi YP, Vodopianov A, Vörös S, Wysłouch B, Young GR. Suppression of high-p{T} neutral pion production in central Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV relative to p+C and p+Pb collisions. Phys Rev Lett 2008; 100:242301. [PMID: 18643578 DOI: 10.1103/physrevlett.100.242301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2007] [Revised: 05/12/2008] [Indexed: 05/26/2023]
Abstract
Neutral pion transverse momentum spectra were measured in p+C and p+Pb collisions at sqrt[S{NN}]=17.4 GeV at midrapidity (2.3 less than or approximately equal eta{lab} less than or approximately equal 3.0) over the range 0.7 less than or approximately equal p{T} less than or approximately equal 3.5 GeV/c. The spectra are compared to pi{0} spectra measured in Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV in the same experiment. For a wide range of Pb+Pb centralities (N{part} less than or approximately equal 300), the yield of pi{0}'s with p{T} greater than or approximately equal 2 GeV/c is larger than or consistent with the p+C or p+Pb yields scaled with the number of nucleon-nucleon collisions (N{coll}), while for central Pb+Pb collisions with N{part}greater than or approximately equal 350, the pi{0} yield is suppressed.
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Abstract
Central synapses exhibit spontaneous neurotransmitter release that is selectively regulated by cAMP-dependent protein kinase A (PKA). We now show that synaptic vesicles contain synaptotagmin-12, a synaptotagmin isoform that differs from classical synaptotagmins in that it does not bind Ca2+. In synaptic vesicles, synaptotagmin-12 forms a complex with synaptotagmin-1 that prevents synaptotagmin-1 from interacting with SNARE complexes. We demonstrate that synaptotagmin-12 is phosphorylated by cAMP-dependent PKA on serine97, and show that expression of synaptotagmin-12 in neurons increases spontaneous neurotransmitter release by approximately threefold, but has no effect on evoked release. Replacing serine97 by alanine abolishes synaptotagmin-12 phosphorylation and blocks its effect on spontaneous release. Our data suggest that spontaneous synaptic-vesicle exocytosis is selectively modulated by a Ca2+-independent synaptotagmin isoform, synaptotagmin-12, which is controlled by cAMP-dependent phosphorylation.
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Affiliation(s)
- Anton Maximov
- Center for Basic Neuroscience, UT Southwestern Medical Center, Dallas, TX 75390, USA
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Maximov A, Pang ZP, Tervo DGR, Südhof TC. Monitoring synaptic transmission in primary neuronal cultures using local extracellular stimulation. J Neurosci Methods 2006; 161:75-87. [PMID: 17118459 DOI: 10.1016/j.jneumeth.2006.10.009] [Citation(s) in RCA: 112] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2006] [Revised: 10/10/2006] [Accepted: 10/11/2006] [Indexed: 12/23/2022]
Abstract
Various techniques have been applied for the functional analysis of synaptic transmission in cultured neurons. Here, we describe a method of studying synaptic transmission in neurons cultured at high-density from different brain regions such as the cortex, striatum and spinal cord. We use postsynaptic whole-cell recordings to monitor synaptic currents triggered by presynaptic action potentials that are induced by brief stimulations with a nearby extracellular bipolar electrode. Pharmacologically isolated excitatory or inhibitory postsynaptic currents can be reliably induced, with amplitudes, synaptic charge transfers, and short-term plasticity properties that are reproducible from culture to culture. We show that the size and kinetics of pharmacologically isolated inhibitory postsynaptic currents triggered by single action potentials or stimulus trains depend on the Ca2+ concentration, temperature and stimulation frequency. This method can be applied to study synaptic transmission in wildtype neurons infected with lentiviruses encoding various components of presynaptic release machinery, or in neurons from genetically modified mice, for example neurons carrying floxed genes in which gene expression can be acutely ablated by expression of Cre recombinase. The preparation described in this paper should be useful for analysis of synaptic transmission in inter-neuronal synapses formed by different types of neurons.
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Affiliation(s)
- Anton Maximov
- Center for Basic Neuroscience, Department of Molecular Genetics, 6000 Harry Hines Blvd. Dallas, TX 75390-9111, USA
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Tang J, Maximov A, Shin OH, Dai H, Rizo J, Südhof TC. A complexin/synaptotagmin 1 switch controls fast synaptic vesicle exocytosis. Cell 2006; 126:1175-87. [PMID: 16990140 DOI: 10.1016/j.cell.2006.08.030] [Citation(s) in RCA: 292] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Revised: 06/29/2006] [Accepted: 08/18/2006] [Indexed: 10/24/2022]
Abstract
Ca(2+) binding to synaptotagmin 1 triggers fast exocytosis of synaptic vesicles that have been primed for release by SNARE-complex assembly. Besides synaptotagmin 1, fast Ca(2+)-triggered exocytosis requires complexins. Synaptotagmin 1 and complexins both bind to assembled SNARE complexes, but it is unclear how their functions are coupled. Here we propose that complexin binding activates SNARE complexes into a metastable state and that Ca(2+) binding to synaptotagmin 1 triggers fast exocytosis by displacing complexin from metastable SNARE complexes. Specifically, we demonstrate that, biochemically, synaptotagmin 1 competes with complexin for SNARE-complex binding, thereby dislodging complexin from SNARE complexes in a Ca(2+)-dependent manner. Physiologically, increasing the local concentration of complexin selectively impairs fast Ca(2+)-triggered exocytosis but retains other forms of SNARE-dependent fusion. The hypothesis that Ca(2+)-induced displacement of complexins from SNARE complexes triggers fast exocytosis accounts for the loss-of-function and gain-of-function phenotypes of complexins and provides a molecular explanation for the high speed and synchronicity of fast Ca(2+)-triggered neurotransmitter release.
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Affiliation(s)
- Jiong Tang
- The Center for Basic Neuroscience, UT Southwestern Medical Center, Dallas, TX 75390, USA
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50
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Pang ZP, Sun J, Rizo J, Maximov A, Südhof TC. Genetic analysis of synaptotagmin 2 in spontaneous and Ca2+-triggered neurotransmitter release. EMBO J 2006; 25:2039-50. [PMID: 16642042 PMCID: PMC1462977 DOI: 10.1038/sj.emboj.7601103] [Citation(s) in RCA: 132] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2006] [Accepted: 03/28/2006] [Indexed: 11/09/2022] Open
Abstract
Synaptotagmin 2 resembles synaptotagmin 1, the Ca2+ sensor for fast neurotransmitter release in forebrain synapses, but little is known about synaptotagmin 2 function. Here, we describe a severely ataxic mouse strain that harbors a single, destabilizing amino-acid substitution (I377N) in synaptotagmin 2. In Calyx of Held synapses, this mutation causes a delay and a decrease in Ca2+-induced but not in hypertonic sucrose-induced release, suggesting that synaptotagmin 2 mediates Ca2+ triggering of evoked release in brainstem synapses. Unexpectedly, we additionally observed in synaptotagmin 2 mutant synapses a dramatic increase in spontaneous release. Synaptotagmin 1-deficient excitatory and inhibitory cortical synapses also displayed a large increase in spontaneous release, demonstrating that this effect was shared among synaptotagmins 1 and 2. Our data suggest that synaptotagmin 1 and 2 perform equivalent functions in the Ca2+ triggering of action potential-induced release and in the restriction of spontaneous release, consistent with a general role of synaptotagmins in controlling 'release slots' for synaptic vesicles at the active zone.
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Affiliation(s)
- Zhiping P Pang
- Departments of Molecular Genetics, Pharmacology, and Biochemistry, Center for Basic Neuroscience, Howard Hughes Medical Institute, UT Southwestern Medical Center, Dallas, TX, USA
| | - Jianyuan Sun
- Departments of Molecular Genetics, Pharmacology, and Biochemistry, Center for Basic Neuroscience, Howard Hughes Medical Institute, UT Southwestern Medical Center, Dallas, TX, USA
| | - Josep Rizo
- Departments of Molecular Genetics, Pharmacology, and Biochemistry, Center for Basic Neuroscience, Howard Hughes Medical Institute, UT Southwestern Medical Center, Dallas, TX, USA
| | - Anton Maximov
- Departments of Molecular Genetics, Pharmacology, and Biochemistry, Center for Basic Neuroscience, Howard Hughes Medical Institute, UT Southwestern Medical Center, Dallas, TX, USA
| | - Thomas C Südhof
- Departments of Molecular Genetics, Pharmacology, and Biochemistry, Center for Basic Neuroscience, Howard Hughes Medical Institute, UT Southwestern Medical Center, Dallas, TX, USA
- Department of Molecular Genetics, Center for Basic Neuroscience, Howard Hughes Medical Institute, UT Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390-9111 USA. Tel.: +1 214 648 1876; Fax: +1 214 648 1879; E-mail:
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