1
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Spinelli C, Adnani L, Meehan B, Montermini L, Huang S, Kim M, Nishimura T, Croul SE, Nakano I, Riazalhosseini Y, Rak J. Mesenchymal glioma stem cells trigger vasectasia-distinct neovascularization process stimulated by extracellular vesicles carrying EGFR. Nat Commun 2024; 15:2865. [PMID: 38570528 PMCID: PMC10991552 DOI: 10.1038/s41467-024-46597-x] [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: 05/05/2022] [Accepted: 03/04/2024] [Indexed: 04/05/2024] Open
Abstract
Targeting neovascularization in glioblastoma (GBM) is hampered by poor understanding of the underlying mechanisms and unclear linkages to tumour molecular landscapes. Here we report that different molecular subtypes of human glioma stem cells (GSC) trigger distinct endothelial responses involving either angiogenic or circumferential vascular growth (vasectasia). The latter process is selectively triggered by mesenchymal (but not proneural) GSCs and is mediated by a subset of extracellular vesicles (EVs) able to transfer EGFR/EGFRvIII transcript to endothelial cells. Inhibition of the expression and phosphorylation of EGFR in endothelial cells, either pharmacologically (Dacomitinib) or genetically (gene editing), abolishes their EV responses in vitro and disrupts vasectasia in vivo. Therapeutic inhibition of EGFR markedly extends anticancer effects of VEGF blockade in mice, coupled with abrogation of vasectasia and prolonged survival. Thus, vasectasia driven by intercellular transfer of oncogenic EGFR may represent a new therapeutic target in a subset of GBMs.
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Affiliation(s)
- Cristiana Spinelli
- McGill University, The Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Lata Adnani
- McGill University, The Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Brian Meehan
- McGill University, The Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Laura Montermini
- McGill University, The Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Sidong Huang
- Department of Biochemistry, McGill University, Montreal, QC, Canada
- Rosalind & Morris Goodman Cancer Institute, McGill University, Montreal, QC, Canada
| | - Minjun Kim
- Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - Tamiko Nishimura
- Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - Sidney E Croul
- Department of Pathology & Laboratory Medicine, Dalhousie University, Halifax, NS, Canada
| | - Ichiro Nakano
- Department of Neurosurgery, Hokuto Social Medical Corporation, Hokuto Hospital, Kisen-7-5 Inadacho, Obihiro, Hokkaido, 080-0833, Japan
| | | | - Janusz Rak
- McGill University, The Research Institute of the McGill University Health Centre, Montreal, QC, Canada.
- Department of Biochemistry, McGill University, Montreal, QC, Canada.
- Department of Human Genetics, McGill University, Montreal, QC, Canada.
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2
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Cao M, Ren Y, Wu Y, Shen J, Li S, Yu ZQ, Liu S, Li J, Rojas OJ, Chen Z. Biobased and biodegradable films exhibiting circularly polarized room temperature phosphorescence. Nat Commun 2024; 15:2375. [PMID: 38490985 PMCID: PMC10943238 DOI: 10.1038/s41467-024-45844-5] [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: 11/01/2023] [Accepted: 02/06/2024] [Indexed: 03/18/2024] Open
Abstract
There is interest in developing sustainable materials displaying circularly polarized room-temperature phosphorescence, which have been scarcely reported. Here, we introduce biobased thin films exhibiting circularly polarized luminescence with simultaneous room-temperature phosphorescence. For this purpose, phosphorescence-active lignosulfonate biomolecules are co-assembled with cellulose nanocrystals in a chiral construct. The lignosulfonate is shown to capture the chirality generated by cellulose nanocrystals within the films, emitting circularly polarized phosphorescence with a 0.21 dissymmetry factor and 103 ms phosphorescence lifetime. By contrast with most organic phosphorescence materials, this chiral-phosphorescent system possesses phosphorescence stability, with no significant recession under extreme chemical environments. Meanwhile, the luminescent films resist water and humid environments but are fully biodegradable (16 days) in soil conditions. The introduced bio-based, environmentally-friendly circularly polarized phosphorescence system is expected to open many opportunities, as demonstrated here for information processing and anti-counterfeiting.
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Affiliation(s)
- Mengnan Cao
- Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, China
| | - Yiran Ren
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518071, China
| | - Yue Wu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518071, China.
| | - Jingjie Shen
- Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, China
| | - Shujun Li
- Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, China.
| | - Zhen-Qiang Yu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518071, China
| | - Shouxin Liu
- Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, China
| | - Jian Li
- Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, China
| | - Orlando J Rojas
- Bioproducts Institute, Department of Chemical & Biological Engineering, University of British Columbia, Vancouver, British Columbia, Vancouver, BC, V6T 1Z3, Canada.
- Department of Chemistry, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada.
- Department of Wood Science, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.
| | - Zhijun Chen
- Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, China.
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3
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Liu J, Marquez M, Lai Y, Ibrahim H, Légaré K, Lassonde P, Liu X, Hehn M, Mangin S, Malinowski G, Li Z, Légaré F, Liang J. Swept coded aperture real-time femtophotography. Nat Commun 2024; 15:1589. [PMID: 38383494 PMCID: PMC10882056 DOI: 10.1038/s41467-024-45820-z] [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: 02/24/2023] [Accepted: 01/31/2024] [Indexed: 02/23/2024] Open
Abstract
Single-shot real-time femtophotography is indispensable for imaging ultrafast dynamics during their times of occurrence. Despite their advantages over conventional multi-shot approaches, existing techniques confront restricted imaging speed or degraded data quality by the deployed optoelectronic devices and face challenges in the application scope and acquisition accuracy. They are also hindered by the limitations in the acquirable information imposed by the sensing models. Here, we overcome these challenges by developing swept coded aperture real-time femtophotography (SCARF). This computational imaging modality enables all-optical ultrafast sweeping of a static coded aperture during the recording of an ultrafast event, bringing full-sequence encoding of up to 156.3 THz to every pixel on a CCD camera. We demonstrate SCARF's single-shot ultrafast imaging ability at tunable frame rates and spatial scales in both reflection and transmission modes. Using SCARF, we image ultrafast absorption in a semiconductor and ultrafast demagnetization of a metal alloy.
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Affiliation(s)
- Jingdan Liu
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada
- Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Miguel Marquez
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada
| | - Yingming Lai
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada
| | - Heide Ibrahim
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada
| | - Katherine Légaré
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada
| | - Philippe Lassonde
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada
| | - Xianglei Liu
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada
| | - Michel Hehn
- Institut Jean Lamour, Université de Lorraine, Parc de Saurupt CS 50840, Nancy, 54011, France
| | - Stéphane Mangin
- Institut Jean Lamour, Université de Lorraine, Parc de Saurupt CS 50840, Nancy, 54011, France
| | - Grégory Malinowski
- Institut Jean Lamour, Université de Lorraine, Parc de Saurupt CS 50840, Nancy, 54011, France
| | - Zhengyan Li
- School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, Hubei, China
| | - François Légaré
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada
| | - Jinyang Liang
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada.
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4
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Gagnon D, Barry H, Barhdadi A, Oussaid E, Mongrain I, Lemieux Perreault LP, Dubé MP. A dataset of proteomic changes during human heat stress and heat acclimation. Sci Data 2023; 10:877. [PMID: 38062080 PMCID: PMC10703874 DOI: 10.1038/s41597-023-02809-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 11/30/2023] [Indexed: 12/18/2023] Open
Abstract
Hotter climates have important impacts on human health and performance. Yet, the cellular and molecular responses involved in human heat stress and acclimation remain understudied. This dataset includes physiological measurements and the plasma concentration of 2,938 proteins collected from 10 healthy adults, before and during passive heat stress that was performed both prior to and after a 7-day heat acclimation protocol. Physiological measurements included body temperatures, sweat rate, cutaneous vascular conductance, blood pressure, and skin sympathetic nerve activity. The proteomic dataset was generated using the Olink Explore 3072 assay, enabling a high-multiplex antibody-based assessment of protein changes based on proximity extension assay technology. The data need to be interpreted in the context of the moderate level of body hyperthermia attained and the specific demographic of young, healthy adults. We have made this dataset publicly available to facilitate research into the cellular and molecular mechanisms involved in human heat stress and acclimation, crucial for addressing the health and performance challenges posed by rising temperatures.
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Affiliation(s)
- Daniel Gagnon
- Montreal Heart Institute, Montreal, QC, Canada.
- School of Kinesiology and Exercise Science, Université de Montréal, Montreal, QC, Canada.
- Department of Pharmacology and Physiology, Université de Montréal, Montreal, QC, Canada.
| | - Hadiatou Barry
- Montreal Heart Institute, Montreal, QC, Canada
- Department of Pharmacology and Physiology, Université de Montréal, Montreal, QC, Canada
| | - Amina Barhdadi
- Montreal Heart Institute, Montreal, QC, Canada
- Université de Montréal Beaulieu-Saucier Pharmacogenomics Centre, Montreal, QC, Canada
| | - Essaid Oussaid
- Montreal Heart Institute, Montreal, QC, Canada
- Université de Montréal Beaulieu-Saucier Pharmacogenomics Centre, Montreal, QC, Canada
| | - Ian Mongrain
- Montreal Heart Institute, Montreal, QC, Canada
- Université de Montréal Beaulieu-Saucier Pharmacogenomics Centre, Montreal, QC, Canada
| | - Louis-Philippe Lemieux Perreault
- Montreal Heart Institute, Montreal, QC, Canada
- Université de Montréal Beaulieu-Saucier Pharmacogenomics Centre, Montreal, QC, Canada
| | - Marie-Pierre Dubé
- Montreal Heart Institute, Montreal, QC, Canada.
- Université de Montréal Beaulieu-Saucier Pharmacogenomics Centre, Montreal, QC, Canada.
- Department of Medicine and Department of Social and Preventive Medicine, Université de Montréal, Montreal, QC, Canada.
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5
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Zhao B, Shi X, Khakalo S, Meng Y, Miettinen A, Turpeinen T, Mi S, Sun Z, Khakalo A, Rojas OJ, Mattos BD. Wood-based superblack. Nat Commun 2023; 14:7875. [PMID: 38052773 DOI: 10.1038/s41467-023-43594-4] [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: 08/03/2023] [Accepted: 11/14/2023] [Indexed: 12/07/2023] Open
Abstract
Light is a powerful and sustainable resource, but it can be detrimental to the performance and longevity of optical devices. Materials with near-zero light reflectance, i.e. superblack materials, are sought to improve the performance of several light-centered technologies. Here we report a simple top-down strategy, guided by computational methods, to develop robust superblack materials following metal-free wood delignification and carbonization (1500 °C). Subwavelength severed cells evolve under shrinkage stresses, yielding vertically aligned carbon microfiber arrays with a thickness of ~100 µm and light reflectance as low as 0.36% and independent of the incidence angle. The formation of such structures is rationalized based on delignification method, lignin content, carbonization temperature and wood density. Moreover, our measurements indicate a laser beam reflectivity lower than commercial light stoppers in current use. Overall, the wood-based superblack material is introduced as a mechanically robust surrogate for microfabricated carbon nanotube arrays.
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Affiliation(s)
- Bin Zhao
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Espoo, FI-02150, Finland
| | - Xuetong Shi
- Bioproduct Institute, The University of British Columbia, Vancouver, BC, V6T 1Z3, Canada
| | - Sergei Khakalo
- Department of Civil Engineering, School of Engineering, Aalto University, Espoo, FI-02150, Finland
- Integrated Computational Materials Engineering, VTT Technical Research Centre of Finland Ltd, Espoo, FI-02044, Finland
| | - Yang Meng
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China
| | - Arttu Miettinen
- Department of Physics, University of Jyvaskyla, Jyväskylä, FI-40014, Finland
| | - Tuomas Turpeinen
- Fiber Web Processes, VTT Technical Research Centre of Finland Ltd, Jyväskylä, FI-40400, Finland
| | - Shuyi Mi
- Department of Electronics and Nanoengineering, Aalto University, Espoo, FI-02150, Finland
| | - Zhipei Sun
- Department of Electronics and Nanoengineering, Aalto University, Espoo, FI-02150, Finland
- QTF Centre of Excellence, Department of Applied Physics, Aalto University, Espoo, FI-02150, Finland
| | - Alexey Khakalo
- Cellulose Coatings and Films, VTT Technical Research Centre of Finland Ltd, Espoo, FI-02044, Finland
| | - Orlando J Rojas
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Espoo, FI-02150, Finland.
- Bioproduct Institute, The University of British Columbia, Vancouver, BC, V6T 1Z3, Canada.
| | - Bruno D Mattos
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Espoo, FI-02150, Finland.
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6
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Huang J, Keenan T, Richard F, Lu J, Jenny SE, Jean A, Arseniyadis S, Leitch DC. Chiral, air stable, and reliable Pd(0) precatalysts applicable to asymmetric allylic alkylation chemistry. Nat Commun 2023; 14:8058. [PMID: 38052843 DOI: 10.1038/s41467-023-43512-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 11/11/2023] [Indexed: 12/07/2023] Open
Abstract
Stereoselective carbon-carbon bond formation via palladium-catalyzed asymmetric allylic alkylation is a crucial strategy to access chiral natural products and active pharmaceutical ingredients. However, catalysts based on the privileged Trost and Pfaltz-Helmchen-Williams PHOX ligands often require high loadings, specific preactivation protocols, and excess chiral ligand. This makes these reactions uneconomical, often unreproducible, and thus unsustainable. Here we report several chiral single-component Pd(0) precatalysts that are active and practically-applicable in a variety of asymmetric allylic alkylation reactions. Despite the decades-long history and widespread use of Trost-type ligands, the precatalysts in this work are the only reported examples of stable, isolable Pd(0) complexes with these ligands. Evaluating these precatalysts across nine asymmetric allylic alkylation reactions reveals high reactivity and selectivity at low Pd loading. Importantly, we also report an unprecedented Pd-catalyzed enantioselective allylation of a hydantoin, achieved on gram scale in high yield and enantioselectivity with only 0.2 mol% catalyst.
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Affiliation(s)
- Jingjun Huang
- University of Victoria, Department of Chemistry, 3800 Finnerty Road, Victoria, BC, V8P 5C2, Canada
| | - Thomas Keenan
- Queen Mary University of London, Department of Chemistry, Mile End Road, London, E1 4NS, UK
| | - François Richard
- Queen Mary University of London, Department of Chemistry, Mile End Road, London, E1 4NS, UK
| | - Jingru Lu
- University of Victoria, Department of Chemistry, 3800 Finnerty Road, Victoria, BC, V8P 5C2, Canada
| | - Sarah E Jenny
- Temple University, Department of Chemistry, 1901 N. Broad St, Philadelphia, PA, 19122, USA
| | - Alexandre Jean
- Industrial Research Centre, Oril Industrie, 13 rue Desgenétais, 76210, Bolbec, France
| | - Stellios Arseniyadis
- Queen Mary University of London, Department of Chemistry, Mile End Road, London, E1 4NS, UK.
| | - David C Leitch
- University of Victoria, Department of Chemistry, 3800 Finnerty Road, Victoria, BC, V8P 5C2, Canada.
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7
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Taha A, Gilmore G, Abbass M, Kai J, Kuehn T, Demarco J, Gupta G, Zajner C, Cao D, Chevalier R, Ahmed A, Hadi A, Karat BG, Stanley OW, Park PJ, Ferko KM, Hemachandra D, Vassallo R, Jach M, Thurairajah A, Wong S, Tenorio MC, Ogunsanya F, Khan AR, Lau JC. Magnetic resonance imaging datasets with anatomical fiducials for quality control and registration. Sci Data 2023; 10:449. [PMID: 37438367 DOI: 10.1038/s41597-023-02330-9] [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: 02/15/2023] [Accepted: 06/26/2023] [Indexed: 07/14/2023] Open
Abstract
Tools available for reproducible, quantitative assessment of brain correspondence have been limited. We previously validated the anatomical fiducial (AFID) placement protocol for point-based assessment of image registration with millimetric (mm) accuracy. In this data descriptor, we release curated AFID placements for some of the most commonly used structural magnetic resonance imaging datasets and templates. The release of our accurate placements allows for rapid quality control of image registration, teaching neuroanatomy, and clinical applications such as disease diagnosis and surgical targeting. We release placements on individual subjects from four datasets (N = 132 subjects for a total of 15,232 fiducials) and 14 brain templates (4,288 fiducials), totalling more than 300 human rater hours of annotation. We also validate human rater accuracy of released placements to be within 1 - 2 mm (using more than 45,000 Euclidean distances), consistent with prior studies. Our data is compliant with the Brain Imaging Data Structure allowing for facile incorporation into neuroimaging analysis pipelines.
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Affiliation(s)
- Alaa Taha
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- School of Biomedical Engineering, Western University, London, Canada
| | - Greydon Gilmore
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- School of Biomedical Engineering, Western University, London, Canada
- Department of Clinical Neurological Sciences, Division of Neurosurgery, Western University, London, Canada
| | - Mohamad Abbass
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Department of Clinical Neurological Sciences, Division of Neurosurgery, Western University, London, Canada
- Graduate Program in Neuroscience, Schulich School of Medicine and Dentistry, Western University, London, Canada
| | - Jason Kai
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, Canada
| | - Tristan Kuehn
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- School of Biomedical Engineering, Western University, London, Canada
| | - John Demarco
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, Western University, London, Canada
| | - Geetika Gupta
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Graduate Program in Neuroscience, Schulich School of Medicine and Dentistry, Western University, London, Canada
| | - Chris Zajner
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Department of Clinical Neurological Sciences, Division of Neurosurgery, Western University, London, Canada
| | - Daniel Cao
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Michael G. DeGroote School of Medicine, McMaster University, Hamilton, Canada
| | - Ryan Chevalier
- Department of Clinical Neurological Sciences, Division of Neurosurgery, Western University, London, Canada
| | - Abrar Ahmed
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Department of Clinical Neurological Sciences, Division of Neurosurgery, Western University, London, Canada
| | - Ali Hadi
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Department of Clinical Neurological Sciences, Division of Neurosurgery, Western University, London, Canada
| | - Bradley G Karat
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Graduate Program in Neuroscience, Schulich School of Medicine and Dentistry, Western University, London, Canada
| | - Olivia W Stanley
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, Canada
| | - Patrick J Park
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- School of Biomedical Engineering, Western University, London, Canada
| | - Kayla M Ferko
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Graduate Program in Neuroscience, Schulich School of Medicine and Dentistry, Western University, London, Canada
| | - Dimuthu Hemachandra
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- School of Biomedical Engineering, Western University, London, Canada
| | - Reid Vassallo
- School of Biomedical Engineering, Faculty of Applied Science and Faculty of Medicine, The University of British Columbia, Vancouver, Canada
| | - Magdalena Jach
- Department of Clinical Neurological Sciences, Division of Neurosurgery, Western University, London, Canada
| | - Arun Thurairajah
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Graduate Program in Neuroscience, Schulich School of Medicine and Dentistry, Western University, London, Canada
| | - Sandy Wong
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Department of Clinical Neurological Sciences, Division of Neurosurgery, Western University, London, Canada
| | - Mauricio C Tenorio
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- School of Biomedical Engineering, Western University, London, Canada
| | - Feyi Ogunsanya
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, Canada
| | - Ali R Khan
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada
- School of Biomedical Engineering, Western University, London, Canada
- Graduate Program in Neuroscience, Schulich School of Medicine and Dentistry, Western University, London, Canada
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, Canada
- Centre for Functional and Metabolic Mapping, Robarts Research Institute, Western University, London, Canada
| | - Jonathan C Lau
- Imaging Research Laboratories, Robarts Research Institute, Western University, London, Canada.
- School of Biomedical Engineering, Western University, London, Canada.
- Department of Clinical Neurological Sciences, Division of Neurosurgery, Western University, London, Canada.
- Graduate Program in Neuroscience, Schulich School of Medicine and Dentistry, Western University, London, Canada.
- Centre for Functional and Metabolic Mapping, Robarts Research Institute, Western University, London, Canada.
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8
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Maffei A, Coccaro A, Jaspers-Fayer F, Goertzen J, Sessa P, Liotti M. EEG alpha band functional connectivity reveals distinct cortical dynamics for overt and covert emotional face processing. Sci Rep 2023; 13:9951. [PMID: 37337009 DOI: 10.1038/s41598-023-36860-4] [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: 08/17/2022] [Accepted: 06/13/2023] [Indexed: 06/21/2023] Open
Abstract
Current knowledge regarding how the focus of our attention during face processing influences neural responses largely comes from neuroimaging studies reporting on regional brain activations. The present study was designed to add novel insights to this research by studying how attention can differentially impact the way cortical regions interact during emotional face processing. High-density electroencephalogram was recorded in a sample of fifty-two healthy participants during an emotional face processing task. The task required participants to either attend to the expressions (i.e., overt processing) or attend to a perceptual distractor, which rendered the expressions task-irrelevant (i.e., covert processing). Functional connectivity in the alpha band was estimated in source space and modeled using graph theory to quantify whole-brain integration and segregation. Results revealed that overt processing of facial expressions is linked to reduced cortical segregation and increased cortical integration, this latter specifically for negative expressions of fear and sadness. Furthermore, we observed increased communication efficiency during overt processing of negative expressions between the core and the extended face processing systems. Overall, these findings reveal that attention makes the interaction among the nodes involved in face processing more efficient, also uncovering a connectivity signature of the prioritized processing mechanism of negative expressions, that is an increased cross-communication within the nodes of the face processing network.
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Affiliation(s)
- Antonio Maffei
- Department of Developmental Psychology and Socialisation, University of Padova, Padua, Italy
- Padova Neuroscience Center (PNC), University of Padova, Padua, Italy
| | - Ambra Coccaro
- Department of Developmental Psychology and Socialisation, University of Padova, Padua, Italy
- Padova Neuroscience Center (PNC), University of Padova, Padua, Italy
| | | | | | - Paola Sessa
- Department of Developmental Psychology and Socialisation, University of Padova, Padua, Italy
- Padova Neuroscience Center (PNC), University of Padova, Padua, Italy
| | - Mario Liotti
- Department of Developmental Psychology and Socialisation, University of Padova, Padua, Italy.
- Padova Neuroscience Center (PNC), University of Padova, Padua, Italy.
- Department of Psychology, Simon Fraser University, Burnaby, Canada.
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Couture N, Cui W, Lippl M, Ostic R, Fandio DJJ, Yalavarthi EK, Vishnuradhan A, Gamouras A, Joly NY, Ménard JM. Single-pulse terahertz spectroscopy monitoring sub-millisecond time dynamics at a rate of 50 kHz. Nat Commun 2023; 14:2595. [PMID: 37147407 PMCID: PMC10163249 DOI: 10.1038/s41467-023-38354-3] [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: 09/07/2022] [Accepted: 04/25/2023] [Indexed: 05/07/2023] Open
Abstract
Slow motion movies allow us to see intricate details of the mechanical dynamics of complex phenomena. If the images in each frame are replaced by terahertz (THz) waves, such movies can monitor low-energy resonances and reveal fast structural or chemical transitions. Here, we combine THz spectroscopy as a non-invasive optical probe with a real-time monitoring technique to demonstrate the ability to resolve non-reproducible phenomena at 50k frames per second, extracting each of the generated THz waveforms every 20 μs. The concept, based on a photonic time-stretch technique to achieve unprecedented data acquisition speeds, is demonstrated by monitoring sub-millisecond dynamics of hot carriers injected in silicon by successive resonant pulses as a saturation density is established. Our experimental configuration will play a crucial role in revealing fast irreversible physical and chemical processes at THz frequencies with microsecond resolution to enable new applications in fundamental research as well as in industry.
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Affiliation(s)
- Nicolas Couture
- Department of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
- Max Planck Centre for Extreme and Quantum Photonics, Ottawa, ON, K1N 6N5, Canada.
| | - Wei Cui
- Department of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
- Max Planck Centre for Extreme and Quantum Photonics, Ottawa, ON, K1N 6N5, Canada
| | - Markus Lippl
- Max Planck Institute for the Science of Light, 91058, Erlangen, Germany
- Department of Physics, University of Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Rachel Ostic
- Department of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
- Max Planck Centre for Extreme and Quantum Photonics, Ottawa, ON, K1N 6N5, Canada
| | - Défi Junior Jubgang Fandio
- Department of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
- Max Planck Centre for Extreme and Quantum Photonics, Ottawa, ON, K1N 6N5, Canada
| | - Eeswar Kumar Yalavarthi
- Department of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
- Max Planck Centre for Extreme and Quantum Photonics, Ottawa, ON, K1N 6N5, Canada
| | - Aswin Vishnuradhan
- Department of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
- Max Planck Centre for Extreme and Quantum Photonics, Ottawa, ON, K1N 6N5, Canada
| | - Angela Gamouras
- Department of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
- National Research Council Canada, Ottawa, ON, K1A 0R6, Canada
| | - Nicolas Y Joly
- Max Planck Institute for the Science of Light, 91058, Erlangen, Germany
- Department of Physics, University of Erlangen-Nürnberg, 91058, Erlangen, Germany
- Interdisciplinary Center for Nanostructured Films, 91058, Erlangen, Germany
| | - Jean-Michel Ménard
- Department of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
- Max Planck Centre for Extreme and Quantum Photonics, Ottawa, ON, K1N 6N5, Canada.
- National Research Council Canada, Ottawa, ON, K1A 0R6, Canada.
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Jacquemot L, Vigneron A, Tremblay JÉ, Lovejoy C. Contrasting sea ice conditions shape microbial food webs in Hudson Bay (Canadian Arctic). ISME Commun 2022; 2:104. [PMID: 37938285 PMCID: PMC9723562 DOI: 10.1038/s43705-022-00192-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 10/07/2022] [Accepted: 10/12/2022] [Indexed: 01/07/2023]
Abstract
The transition from ice-covered to open water is a recurring feature of the Arctic and sub-Arctic, but microbial diversity and cascading effects on the microbial food webs is poorly known. Here, we investigated microbial eukaryote, bacterial and archaeal communities in Hudson Bay (sub-Arctic, Canada) under sea-ice cover and open waters conditions. Co-occurrence networks revealed a <3 µm pico‒phytoplankton-based food web under the ice and a >3 µm nano‒microphytoplankton-based food web in the open waters. The ice-edge communities were characteristic of post-bloom conditions with high proportions of the picophytoplankton Micromonas and Bathycoccus. Nano‒ to micro‒phytoplankton and ice associated diatoms were detected throughout the water column, with the sympagic Melosira arctica exclusive to ice-covered central Hudson Bay and Thalassiosira in open northwestern Hudson Bay. Heterotrophic microbial eukaryotes and prokaryotes also differed by ice-state, suggesting a linkage between microbes at depth and surface phytoplankton bloom state. The findings suggest that a longer open water season may favor the establishment of a large phytoplankton-based food web at the subsurface chlorophyll maxima (SCM), increasing carbon export from pelagic diatoms to deeper waters and affect higher trophic levels in the deep Hudson Bay.
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Affiliation(s)
- Loïc Jacquemot
- Département de Biologie, Université Laval, Québec, QC, Canada.
- Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Québec, QC, Canada.
| | - Adrien Vigneron
- Département de Biologie, Université Laval, Québec, QC, Canada
- Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Québec, QC, Canada
| | | | - Connie Lovejoy
- Département de Biologie, Université Laval, Québec, QC, Canada
- Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Québec, QC, Canada
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Garcia C, Burgain A, Chaillot J, Pic É, Khemiri I, Sellam A. A phenotypic small-molecule screen identifies halogenated salicylanilides as inhibitors of fungal morphogenesis, biofilm formation and host cell invasion. Sci Rep 2018; 8:11559. [PMID: 30068935 PMCID: PMC6070544 DOI: 10.1038/s41598-018-29973-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [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: 03/02/2018] [Accepted: 07/23/2018] [Indexed: 12/15/2022] Open
Abstract
A poorly exploited paradigm in the antimicrobial therapy field is to target virulence traits for drug development. In contrast to target-focused approaches, antivirulence phenotypic screens enable identification of bioactive molecules that induce a desirable biological readout without making a priori assumption about the cellular target. Here, we screened a chemical library of 678 small molecules against the invasive hyphal growth of the human opportunistic yeast Candida albicans. We found that a halogenated salicylanilide (N1-(3,5-dichlorophenyl)-5-chloro-2-hydroxybenzamide) and one of its analogs, Niclosamide, an FDA-approved anthelmintic in humans, exhibited both antifilamentation and antibiofilm activities against C. albicans and the multi-resistant yeast C. auris. The antivirulence activity of halogenated salicylanilides were also expanded to C. albicans resistant strains with different resistance mechanisms. We also found that Niclosamide protected the intestinal epithelial cells against invasion by C. albicans. Transcriptional profiling of C. albicans challenged with Niclosamide exhibited a signature that is characteristic of the mitochondria-to-nucleus retrograde response. Our chemogenomic analysis showed that halogenated salicylanilides compromise the potential-dependant mitochondrial protein translocon machinery. Given the fact that the safety of Niclosamide is well established in humans, this molecule could represent the first clinically approved antivirulence agent against a pathogenic fungus.
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Affiliation(s)
- Carlos Garcia
- CHU de Québec Research Center (CHUQ), Université Laval, Quebec City, QC, Canada
| | - Anaïs Burgain
- CHU de Québec Research Center (CHUQ), Université Laval, Quebec City, QC, Canada
| | - Julien Chaillot
- CHU de Québec Research Center (CHUQ), Université Laval, Quebec City, QC, Canada
| | - Émilie Pic
- CHU de Québec Research Center (CHUQ), Université Laval, Quebec City, QC, Canada
| | - Inès Khemiri
- CHU de Québec Research Center (CHUQ), Université Laval, Quebec City, QC, Canada
| | - Adnane Sellam
- CHU de Québec Research Center (CHUQ), Université Laval, Quebec City, QC, Canada.
- Department of Microbiology-Infectious Disease and Immunology, Faculty of Medicine, Université Laval, Quebec City, QC, Canada.
- Big Data Research Centre (BDRC-UL), Université Laval, Faculty of Sciences and engineering, Quebec City, QC, Canada.
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