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1
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Siddiqui KM, Durham DB, Cropp F, Ji F, Paiagua S, Ophus C, Andresen NC, Jin L, Wu J, Wang S, Zhang X, You W, Murnane M, Centurion M, Wang X, Slaughter DS, Kaindl RA, Musumeci P, Minor AM, Filippetto D. Relativistic ultrafast electron diffraction at high repetition rates. Struct Dyn 2023; 10:064302. [PMID: 38058995 PMCID: PMC10697722 DOI: 10.1063/4.0000203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 11/08/2023] [Indexed: 12/08/2023]
Abstract
The ability to resolve the dynamics of matter on its native temporal and spatial scales constitutes a key challenge and convergent theme across chemistry, biology, and materials science. The last couple of decades have witnessed ultrafast electron diffraction (UED) emerge as one of the forefront techniques with the sensitivity to resolve atomic motions. Increasingly sophisticated UED instruments are being developed that are aimed at increasing the beam brightness in order to observe structural signatures, but so far they have been limited to low average current beams. Here, we present the technical design and capabilities of the HiRES (High Repetition-rate Electron Scattering) instrument, which blends relativistic electrons and high repetition rates to achieve orders of magnitude improvement in average beam current compared to the existing state-of-the-art instruments. The setup utilizes a novel electron source to deliver femtosecond duration electron pulses at up to MHz repetition rates for UED experiments. Instrument response function of sub-500 fs is demonstrated with < 100 fs time resolution targeted in future. We provide example cases of diffraction measurements on solid-state and gas-phase samples, including both micro- and nanodiffraction (featuring 100 nm beam size) modes, which showcase the potential of the instrument for novel UED experiments.
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Affiliation(s)
- K. M. Siddiqui
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | | | | | - F. Ji
- Accelerator Technology and Applied Physics Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - S. Paiagua
- Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, USA
| | - C. Ophus
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - N. C. Andresen
- Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - L. Jin
- Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, California 94720, USA
| | - J. Wu
- Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, California 94720, USA
| | - S. Wang
- Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, California 94720, USA
| | - X. Zhang
- Department of Mechanical Engineering, University of California at Berkeley, Berkeley, California 94720, USA
| | - W. You
- Department of Physics and JILA, University of Colorado and NIST, Boulder, Colorado 80309, USA
| | - M. Murnane
- Department of Physics and JILA, University of Colorado and NIST, Boulder, Colorado 80309, USA
| | - M. Centurion
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - X. Wang
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - D. S. Slaughter
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, California 94720, USA
| | | | - P. Musumeci
- Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA
| | | | - D. Filippetto
- Accelerator Technology and Applied Physics Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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2
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Liu Y, Sanchez DM, Ware MR, Champenois EG, Yang J, Nunes JPF, Attar A, Centurion M, Cryan JP, Forbes R, Hegazy K, Hoffmann MC, Ji F, Lin MF, Luo D, Saha SK, Shen X, Wang XJ, Martínez TJ, Wolf TJA. Rehybridization dynamics into the pericyclic minimum of an electrocyclic reaction imaged in real-time. Nat Commun 2023; 14:2795. [PMID: 37202402 DOI: 10.1038/s41467-023-38513-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 04/28/2023] [Indexed: 05/20/2023] Open
Abstract
Electrocyclic reactions are characterized by the concerted formation and cleavage of both σ and π bonds through a cyclic structure. This structure is known as a pericyclic transition state for thermal reactions and a pericyclic minimum in the excited state for photochemical reactions. However, the structure of the pericyclic geometry has yet to be observed experimentally. We use a combination of ultrafast electron diffraction and excited state wavepacket simulations to image structural dynamics through the pericyclic minimum of a photochemical electrocyclic ring-opening reaction in the molecule α-terpinene. The structural motion into the pericyclic minimum is dominated by rehybridization of two carbon atoms, which is required for the transformation from two to three conjugated π bonds. The σ bond dissociation largely happens after internal conversion from the pericyclic minimum to the electronic ground state. These findings may be transferrable to electrocyclic reactions in general.
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Affiliation(s)
- Y Liu
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, 11790, USA
| | - D M Sanchez
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, CA, 94305, USA
- Design Physics Division, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - M R Ware
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - E G Champenois
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - J Yang
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
- Center of Basic Molecular Science, Department of Chemistry, Mong Man Wai Building of Science and Technology, S-1027 Tsinghua University, Beijing, China
| | - J P F Nunes
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Theodore Jorgensen Hall 208, 855 N 16th Street, Lincoln, NE, 68588, USA
- Diamond Light Source, Harwell Science Campus, Fermi Ave, Didcot, OX11 0DE, UK
| | - A Attar
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - M Centurion
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Theodore Jorgensen Hall 208, 855 N 16th Street, Lincoln, NE, 68588, USA
| | - J P Cryan
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - R Forbes
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - K Hegazy
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - M C Hoffmann
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - F Ji
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - M-F Lin
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - D Luo
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - S K Saha
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Theodore Jorgensen Hall 208, 855 N 16th Street, Lincoln, NE, 68588, USA
| | - X Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - T J Martínez
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, CA, 94305, USA.
| | - T J A Wolf
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
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3
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Champenois EG, Sanchez DM, Yang J, Figueira Nunes JP, Attar A, Centurion M, Forbes R, Gühr M, Hegazy K, Ji F, Saha SK, Liu Y, Lin MF, Luo D, Moore B, Shen X, Ware MR, Wang XJ, Martínez TJ, Wolf TJA. Conformer-specific photochemistry imaged in real space and time. Science 2021; 374:178-182. [PMID: 34618569 DOI: 10.1126/science.abk3132] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- E G Champenois
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - D M Sanchez
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Department of Chemistry, Stanford University, Stanford, CA, USA
| | - J Yang
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Center of Basic Molecular Science, Department of Chemistry, Tsinghua University, Beijing, China
| | - J P Figueira Nunes
- Department of Physics and Astronomy, University of Nebraska, Lincoln, NE, USA
| | - A Attar
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - M Centurion
- Department of Physics and Astronomy, University of Nebraska, Lincoln, NE, USA
| | - R Forbes
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - M Gühr
- Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany
| | - K Hegazy
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Department of Physics, Stanford University, Stanford, CA, USA
| | - F Ji
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - S K Saha
- Department of Physics and Astronomy, University of Nebraska, Lincoln, NE, USA
| | - Y Liu
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA
| | - M-F Lin
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - D Luo
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - B Moore
- Department of Physics and Astronomy, University of Nebraska, Lincoln, NE, USA
| | - X Shen
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - M R Ware
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - T J Martínez
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Department of Chemistry, Stanford University, Stanford, CA, USA
| | - T J A Wolf
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
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4
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Ledbetter K, Biasin E, Nunes JPF, Centurion M, Gaffney KJ, Kozina M, Lin MF, Shen X, Yang J, Wang XJ, Wolf TJA, Cordones AA. Photodissociation of aqueous I 3 - observed with liquid-phase ultrafast mega-electron-volt electron diffraction. Struct Dyn 2020; 7:064901. [PMID: 33415183 PMCID: PMC7771998 DOI: 10.1063/4.0000051] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 11/22/2020] [Indexed: 05/26/2023]
Abstract
Developing femtosecond resolution methods for directly observing structural dynamics is critical to understanding complex photochemical reaction mechanisms in solution. We have used two recent developments, ultrafast mega-electron-volt electron sources and vacuum compatible sub-micron thick liquid sheet jets, to enable liquid-phase ultrafast electron diffraction (LUED). We have demonstrated the viability of LUED by investigating the photodissociation of tri-iodide initiated with a 400 nm laser pulse. This has enabled the average speed of the bond expansion to be measured during the first 750 fs of dissociation and the geminate recombination to be directly captured on the picosecond time scale.
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Affiliation(s)
| | - E. Biasin
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - J. P. F. Nunes
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - M. Centurion
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - K. J. Gaffney
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M. Kozina
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M.-F. Lin
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - X. Shen
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | | | - X. J. Wang
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - T. J. A. Wolf
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - A. A. Cordones
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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5
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Nunes JPF, Ledbetter K, Lin M, Kozina M, DePonte DP, Biasin E, Centurion M, Crissman CJ, Dunning M, Guillet S, Jobe K, Liu Y, Mo M, Shen X, Sublett R, Weathersby S, Yoneda C, Wolf TJA, Yang J, Cordones AA, Wang XJ. Liquid-phase mega-electron-volt ultrafast electron diffraction. Struct Dyn 2020; 7:024301. [PMID: 32161776 PMCID: PMC7062553 DOI: 10.1063/1.5144518] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Accepted: 02/13/2020] [Indexed: 05/23/2023]
Abstract
The conversion of light into usable chemical and mechanical energy is pivotal to several biological and chemical processes, many of which occur in solution. To understand the structure-function relationships mediating these processes, a technique with high spatial and temporal resolutions is required. Here, we report on the design and commissioning of a liquid-phase mega-electron-volt (MeV) ultrafast electron diffraction instrument for the study of structural dynamics in solution. Limitations posed by the shallow penetration depth of electrons and the resulting information loss due to multiple scattering and the technical challenge of delivering liquids to vacuum were overcome through the use of MeV electrons and a gas-accelerated thin liquid sheet jet. To demonstrate the capabilities of this instrument, the structure of water and its network were resolved up to the 3 rd hydration shell with a spatial resolution of 0.6 Å; preliminary time-resolved experiments demonstrated a temporal resolution of 200 fs.
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Affiliation(s)
- J P F Nunes
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | | | - M Lin
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M Kozina
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - D P DePonte
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - E Biasin
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M Centurion
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - C J Crissman
- Department of Applied Physics, Stanford University, Stanford, California 94305, USA
| | - M Dunning
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - S Guillet
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - K Jobe
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Y Liu
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA
| | - M Mo
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - X Shen
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - R Sublett
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - S Weathersby
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - C Yoneda
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - T J A Wolf
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | | | - A A Cordones
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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6
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Abstract
A laser-activated streak camera was built to measure the duration of femtosecond electron pulses. The streak velocity of the device is 1.89 mrad/ps, which corresponds to a sensitivity of 34.9 fs/pixels. The streak camera also measures changes in the relative time of arrival between the laser and electron pulses with a resolution of 70 fs RMS. A full circuit analysis of the structure is presented to describe the streaking field and the general behavior of the device. We have developed a general mathematical model to analyze the streaked images. The model provides an accurate method to extract the pulse duration based on the changes of the electron beam profile when the streaking field is applied.
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Affiliation(s)
- O Zandi
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - K J Wilkin
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - M Centurion
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
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7
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Weathersby SP, Brown G, Centurion M, Chase TF, Coffee R, Corbett J, Eichner JP, Frisch JC, Fry AR, Gühr M, Hartmann N, Hast C, Hettel R, Jobe RK, Jongewaard EN, Lewandowski JR, Li RK, Lindenberg AM, Makasyuk I, May JE, McCormick D, Nguyen MN, Reid AH, Shen X, Sokolowski-Tinten K, Vecchione T, Vetter SL, Wu J, Yang J, Dürr HA, Wang XJ. Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory. Rev Sci Instrum 2015; 86:073702. [PMID: 26233391 DOI: 10.1063/1.4926994] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Ultrafast electron probes are powerful tools, complementary to x-ray free-electron lasers, used to study structural dynamics in material, chemical, and biological sciences. High brightness, relativistic electron beams with femtosecond pulse duration can resolve details of the dynamic processes on atomic time and length scales. SLAC National Accelerator Laboratory recently launched the Ultrafast Electron Diffraction (UED) and microscopy Initiative aiming at developing the next generation ultrafast electron scattering instruments. As the first stage of the Initiative, a mega-electron-volt (MeV) UED system has been constructed and commissioned to serve ultrafast science experiments and instrumentation development. The system operates at 120-Hz repetition rate with outstanding performance. In this paper, we report on the SLAC MeV UED system and its performance, including the reciprocal space resolution, temporal resolution, and machine stability.
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Affiliation(s)
- S P Weathersby
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - G Brown
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Centurion
- University of Nebraska-Lincoln, 855 N 16th Street, Lincoln, Nebraska 68588, USA
| | - T F Chase
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R Coffee
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Corbett
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J P Eichner
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J C Frisch
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A R Fry
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Gühr
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - N Hartmann
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - C Hast
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R Hettel
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R K Jobe
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - E N Jongewaard
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J R Lewandowski
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R K Li
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A M Lindenberg
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - I Makasyuk
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J E May
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - D McCormick
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M N Nguyen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A H Reid
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | | | - T Vecchione
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S L Vetter
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Wu
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Yang
- University of Nebraska-Lincoln, 855 N 16th Street, Lincoln, Nebraska 68588, USA
| | - H A Dürr
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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8
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D'Atri LP, Etulain J, Rivadeneyra L, Lapponi MJ, Centurion M, Cheng K, Yin H, Schattner M. Expression and functionality of Toll-like receptor 3 in the megakaryocytic lineage. J Thromb Haemost 2015; 13:839-50. [PMID: 25594115 PMCID: PMC4424134 DOI: 10.1111/jth.12842] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [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: 07/24/2014] [Accepted: 01/04/2015] [Indexed: 02/04/2023]
Abstract
BACKGROUND In addition to their key role in hemostasis, platelets and megakaryocytes regulate immune and inflammatory responses, in part through their expression of Toll-like receptors (TLRs). Among the TLRs, TLR3 recognizes dsRNA associated with viral infection. Thrombocytopenia is a frequent complication of viral infection. However, the expression and functionality of TLR3 in megakaryocytes and platelets is not yet well understood. OBJECTIVE To study the expression and functionality of TLR3 in the megakaryocytic lineage. METHODS AND RESULTS RT-PCR, flow cytometric and immunofluorescence assays showed that TLR3 is expressed in CD34(+) cells, megakaryocytes, and platelets. Immunoblotting assays showed that stimulation of megakaryocytes with two synthetic agonists of TLR3, Poly(I:C) and Poly(A:U), activated the nuclear factor-κB (NF-κB), phosphoinositide 3-kinase (PI3K)/Akt, extracellular signal-related kinase (ERK)1/2 and p38 pathways. TLR3-megakaryocyte activation resulted in reduced platelet production in vitro and interferon-β release through the PI3K-Akt and NF-κB signaling pathways. TLR3 ligands potentiated the aggregation mediated by classic platelet agonists. This effect was also observed for ATP release, but not for P-selectin or CD40L membrane exposure, indicating that TLR3 activation was not involved in α-granule release. In addition, TLR3 agonists induced activation of the NF-κB, PI3K-Akt and ERK1/2 pathways in platelets. Reductions in platelet production and platelet fibrinogen binding mediated by Poly(I:C) or Poly(A:U) were prevented by the presence of an inhibitor of the TLR3-dsRNA complex. CONCLUSIONS Our findings indicate that functional TLR3 is expressed in CD34(+) cells, megakaryocytes, and platelets, and suggest a potential role for this receptor in the megakaryopoiesis/thrombopoiesis alterations that occur in viral infections.
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Affiliation(s)
- L P D'Atri
- Laboratory of Experimental Thrombosis, Institute of Experimental Medicine, CONICET-National Academy of Medicine, Buenos Aires, Argentina
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9
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Abstract
We have imaged optical-field ionized plasmas with electron densities as low as 10(13) cm(-3) on a picosecond timescale using ultrashort electron pulses. Electric fields generated by the separation of charges are imprinted on a 20 keV probe electron pulse and reveal a cloud of electrons expanding away from a positively charged plasma core. Our method allows for a direct measurement of the electron energy required to escape the plasma and the total charge. Simulations reproduce the main features of the experiment and allow determination of the energy of the electrons.
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Affiliation(s)
- M Centurion
- Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
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