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Schmalz M, Liang XX, Wieser I, Gruschel C, Muskalla L, Stöckl MT, Nitschke R, Linz N, Leitenstorfer A, Vogel A, Ferrando-May E. Dissection of DNA damage and repair pathways in live cells by femtosecond laser microirradiation and free-electron modeling. Proc Natl Acad Sci U S A 2023; 120:e2220132120. [PMID: 37307476 DOI: 10.1073/pnas.2220132120] [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: 12/13/2022] [Accepted: 05/08/2023] [Indexed: 06/14/2023] Open
Abstract
Understanding and predicting the outcome of the interaction of light with DNA has a significant impact on the study of DNA repair and radiotherapy. We report on a combination of femtosecond pulsed laser microirradiation at different wavelengths, quantitative imaging, and numerical modeling that yields a comprehensive picture of photon-mediated and free-electron-mediated DNA damage pathways in live cells. Laser irradiation was performed under highly standardized conditions at four wavelengths between 515 nm and 1,030 nm, enabling to study two-photon photochemical and free-electron-mediated DNA damage in situ. We quantitatively assessed cyclobutane pyrimidine dimer (CPD) and γH2AX-specific immunofluorescence signals to calibrate the damage threshold dose at these wavelengths and performed a comparative analysis of the recruitment of DNA repair factors xeroderma pigmentosum complementation group C (XPC) and Nijmegen breakage syndrome 1 (Nbs1). Our results show that two-photon-induced photochemical CPD generation dominates at 515 nm, while electron-mediated damage dominates at wavelengths ≥620 nm. The recruitment analysis revealed a cross talk between nucleotide excision and homologous recombination DNA repair pathways at 515 nm. Numerical simulations predicted electron densities and electron energy spectra, which govern the yield functions of a variety of direct electron-mediated DNA damage pathways and of indirect damage by •OH radicals resulting from laser and electron interactions with water. Combining these data with information on free electron-DNA interactions gained in artificial systems, we provide a conceptual framework for the interpretation of the wavelength dependence of laser-induced DNA damage that may guide the selection of irradiation parameters in studies and applications that require the selective induction of DNA lesions.
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Affiliation(s)
- Michael Schmalz
- Department of Physics, University of Konstanz, 78457 Konstanz, Germany
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
- Center for Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
| | - Xiao-Xuan Liang
- Institute of Biomedical Optics, University of Lübeck, 23562 Lübeck, Germany
| | - Ines Wieser
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Caroline Gruschel
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Lukas Muskalla
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | | | - Roland Nitschke
- Life Imaging Center and Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
| | - Norbert Linz
- Institute of Biomedical Optics, University of Lübeck, 23562 Lübeck, Germany
| | - Alfred Leitenstorfer
- Department of Physics, University of Konstanz, 78457 Konstanz, Germany
- Center for Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
| | - Alfred Vogel
- Institute of Biomedical Optics, University of Lübeck, 23562 Lübeck, Germany
| | - Elisa Ferrando-May
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
- Center for Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
- Department Enabling Technology, German Cancer Research Center, 69120 Heidelberg, Germany
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Dietzel S, Ferrando-May E, Fried H, Kukat C, Naumann A, Nitschke R, Pasierbek P, Peychl J, Rasse TM, Schroth-Diez B, Stöckl MT, Terjung S, Thuenauer R, Tulok S, Weidtkamp-Peters S. A Joint Action in Times of Pandemic: The German BioImaging Recommendations for Operating Imaging Core Facilities During the SARS-Cov-2 Emergency. Cytometry A 2020; 97:882-886. [PMID: 32583531 PMCID: PMC7361206 DOI: 10.1002/cyto.a.24178] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 05/15/2020] [Revised: 06/16/2020] [Accepted: 06/19/2020] [Indexed: 12/18/2022]
Abstract
Operating shared resource laboratories (SRLs) in times of pandemic is a challenge for research institutions. In a multiuser, high‐turnover working space, the transmission of infectious agents is difficult to control. To address this challenge, imaging core facility managers being members of German BioImaging discussed how shared microscopes could be operated with minimal risk of spreading SARS‐CoV‐2 between users and staff. Here, we describe the resulting guidelines and explain their rationale, with a focus on separating users in space and time, protective face masks, and keeping surfaces virus‐free. These recommendations may prove useful for other types of SRLs. © 2020 The Authors. Cytometry Part A published by Wiley Periodicals LLC. on behalf of International Society for Advancement of Cytometry.
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Affiliation(s)
- Steffen Dietzel
- Core Facility Bioimaging at the Biomedical Center, Ludwig-Maximilians-Universität München, Planegg-Martinsried, Großhaderner Straße 9, 82152, Germany
| | - Elisa Ferrando-May
- Bioimaging Center, University of Konstanz, Konstanz, Universitätsstrasse 10, 78464, Germany
| | - Hans Fried
- German Center for Neurodegenerative Diseases (DZNE), Light Microscopy Facility, Bonn, Venusberg-Campus 1, Gebäude 99, 53127, Germany
| | - Christian Kukat
- FACS & Imaging Core Facility, Max Planck Institute for Biology of Ageing, Cologne, Joseph-Stelzmann-Str. 9b, 50931, Germany
| | - Angela Naumann
- Life Imaging Center and BIOSS Centre for Biological Signaling Studies, Albert-Ludwigs-University Freiburg, Freiburg, Habsburgerstr. 49, 79104, Germany
| | - Roland Nitschke
- Life Imaging Center and BIOSS Centre for Biological Signaling Studies, Albert-Ludwigs-University Freiburg, Freiburg, Habsburgerstr. 49, 79104, Germany
| | - Pawel Pasierbek
- Biooptics Core Facility, Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna BioCenter (VBC), Vienna, Dr. Bohr-Gasse 3, 1030, Austria
| | - Jan Peychl
- Light Microscopy Facility (LMF) Max Planck Institute of Molecular Cell Biology and Genetics Dresden, Dresden, Pfotenhauerstrasse 108, 01307, Germany
| | - Tobias Manuel Rasse
- Scientific Service Group Microscopy, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Ludwigstraße 43, 61231, Germany
| | - Britta Schroth-Diez
- Light Microscopy Facility (LMF) Max Planck Institute of Molecular Cell Biology and Genetics Dresden, Dresden, Pfotenhauerstrasse 108, 01307, Germany
| | - Martin Thomas Stöckl
- Bioimaging Center, University of Konstanz, Konstanz, Universitätsstrasse 10, 78464, Germany
| | - Stefan Terjung
- European Molecular Biology Laboratory, Advanced Light Microscopy Facility, Heidelberg, Meyerhofstraße 1, 69117, Germany
| | - Roland Thuenauer
- Advanced Light and Fluorescence Microscopy Facility, Centre for Structural Systems Biology (CSSB), Hamburg, Germany and Department of Biology, University of Hamburg, Hamburg, Germany
| | - Silke Tulok
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Carus, Core Facility Cellular Imaging, Dresden, Fetscherstrasse 74, 01307, Germany
| | - Stefanie Weidtkamp-Peters
- Center for Advanced Imaging, Heinrich-Heine University Duesseldorf, Duesseldorf, Universitätsstr. 1, 40225, Germany
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- GerBI-GMB, c/o University of Konstanz, Konstanz, Universitätsstrasse 10, 78464, Germany
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Theiss S, Voggel M, Schlötter M, Sutter S, Stöckl MT, Polarz S. Tolerance in superstructures formed from high-quality colloidal ZnO nanoparticles with hexagonal cross-section. CrystEngComm 2019. [DOI: 10.1039/c9ce00811j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The order of periodic arrays of hexagonal ZnO nanoplates has been investigated in terms of polydispersity. A continuous transition from a crystalline to a glassy state has been found.
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Affiliation(s)
- Sebastian Theiss
- University of Konstanz
- Department of Chemistry
- Functional Inorganic Materials Group
- D-78457 Konstanz
- Germany
| | - Michael Voggel
- University of Konstanz
- Department of Chemistry
- Functional Inorganic Materials Group
- D-78457 Konstanz
- Germany
| | - Moritz Schlötter
- University of Konstanz
- Department of Chemistry
- Functional Inorganic Materials Group
- D-78457 Konstanz
- Germany
| | - Sebastian Sutter
- University of Konstanz
- Department of Chemistry
- Functional Inorganic Materials Group
- D-78457 Konstanz
- Germany
| | - Martin Thomas Stöckl
- University of Konstanz
- Department of Chemistry
- Functional Inorganic Materials Group
- D-78457 Konstanz
- Germany
| | - Sebastian Polarz
- University of Konstanz
- Department of Chemistry
- Functional Inorganic Materials Group
- D-78457 Konstanz
- Germany
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Scheck J, Drechsler M, Ma X, Stöckl MT, Konsek J, Schwaderer JB, Stadler SM, De Yoreo JJ, Gebauer D. Polyaspartic acid facilitates oxolation within iron(iii) oxide pre-nucleation clusters and drives the formation of organic-inorganic composites. J Chem Phys 2016; 145:211917. [PMID: 28799341 DOI: 10.1063/1.4963738] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The interplay between polymers and inorganic minerals during the formation of solids is crucial for biomineralization and bio-inspired materials, and advanced material properties can be achieved with organic-inorganic composites. By studying the reaction mechanisms, basic questions on organic-inorganic interactions and their role during material formation can be answered, enabling more target-oriented strategies in future synthetic approaches. Here, we present a comprehensive study on the hydrolysis of iron(iii) in the presence of polyaspartic acid. For the basic investigation of the formation mechanism, a titration assay was used, complemented by microscopic techniques. The polymer is shown to promote precipitation in partly hydrolyzed reaction solutions at the very early stages of the reaction by facilitating iron(iii) hydrolysis. In unhydrolyzed solutions, no significant interactions between the polymer and the inorganic solutes can be observed. We demonstrate that the hydrolysis promotion by the polymer can be understood by facilitating oxolation in olation iron(iii) pre-nucleation clusters. We propose that the adsorption of olation pre-nucleation clusters on the polymer chains and the resulting loss in dynamics and increased proximity of the reactants is the key to this effect. The resulting composite material obtained from the hydrolysis in the presence of the polymer was investigated with additional analytical techniques, namely, scanning and transmission electron microscopies, light microscopy, atomic force microscopy, zeta potential measurements, dynamic light scattering, and thermogravimetric analyses. It consists of elastic, polydisperse nanospheres, ca. 50-200 nm in diameter, and aggregates thereof, exhibiting a high polymer and water content.
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Affiliation(s)
- J Scheck
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - M Drechsler
- Laboratory for Soft Matter Electron Microscopy, BIMF, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany
| | - X Ma
- Department of Chemistry, Idaho State University, Pocatello, Idaho 83201, USA
| | - M T Stöckl
- Bioimaging Center, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - J Konsek
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - J B Schwaderer
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - S M Stadler
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - J J De Yoreo
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - D Gebauer
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
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