1
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Gopal AA, Fernandez B, Delano J, Weissleder R, Dubach JM. PARP trapping is governed by the PARP inhibitor dissociation rate constant. Cell Chem Biol 2024:S2451-9456(23)00476-2. [PMID: 38262416 DOI: 10.1016/j.chembiol.2023.12.019] [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: 10/17/2022] [Revised: 09/13/2023] [Accepted: 12/22/2023] [Indexed: 01/25/2024]
Abstract
Poly(ADP-ribose) polymerase (PARP) inhibitors (PARPi) are a class of cancer drugs that enzymatically inhibit PARP activity at sites of DNA damage. Yet, PARPi function mainly by trapping PARP1 onto DNA with a wide range of potency among the clinically relevant inhibitors. How PARPi trap and why some are better trappers remain unknown. Here, we show trapping occurs primarily through a kinetic phenomenon at sites of DNA damage that correlates with PARPi koff. Our results suggest PARP trapping is not the physical stalling of PARP1 on DNA, rather the high probability of PARP re-binding damaged DNA in the absence of other DNA-binding protein recruitment. These results clarify how PARPi trap, shed new light on how PARPi function, and describe how PARPi properties correlate to trapping potency.
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Affiliation(s)
- Angelica A Gopal
- Institute for Innovation in Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114; Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114
| | - Bianca Fernandez
- Institute for Innovation in Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114; Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114
| | - Justin Delano
- Institute for Innovation in Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114; Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114
| | - Ralph Weissleder
- Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114; Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114; Department of Systems Biology, Harvard Medical School, Boston, MA 02115
| | - J Matthew Dubach
- Institute for Innovation in Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114; Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114; Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114.
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2
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Schneider C, Shen C, Gopal AA, Douglas T, Forestell B, Kauffman KD, Rogers D, Artusa P, Zhang Q, Jing H, Freeman AF, Barber DL, King IL, Saleh M, Wiseman PW, Su HC, Mandl JN. Migration-induced cell shattering due to DOCK8 deficiency causes a type 2-biased helper T cell response. Nat Immunol 2020; 21:1528-1539. [PMID: 33020661 PMCID: PMC10478007 DOI: 10.1038/s41590-020-0795-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 04/27/2019] [Accepted: 08/25/2020] [Indexed: 12/30/2022]
Abstract
Mutations that impact immune cell migration and result in immune deficiency illustrate the importance of cell movement in host defense. In humans, loss-of-function mutations in DOCK8, a guanine exchange factor involved in hematopoietic cell migration, lead to immunodeficiency and, paradoxically, allergic disease. Here, we demonstrate that, like humans, Dock8-/- mice have a profound type 2 CD4+ helper T (TH2) cell bias upon pulmonary infection with Cryptococcus neoformans and other non-TH2 stimuli. We found that recruited Dock8-/-CX3CR1+ mononuclear phagocytes are exquisitely sensitive to migration-induced cell shattering, releasing interleukin (IL)-1β that drives granulocyte-macrophage colony-stimulating factor (GM-CSF) production by CD4+ T cells. Blocking IL-1β, GM-CSF or caspase activation eliminated the type-2 skew in mice lacking Dock8. Notably, treatment of infected wild-type mice with apoptotic cells significantly increased GM-CSF production and TH2 cell differentiation. This reveals an important role for cell death in driving type 2 signals during infection, which may have implications for understanding the etiology of type 2 CD4+ T cell responses in allergic disease.
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Affiliation(s)
- Caitlin Schneider
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
- McGill Research Centre for Complex Traits, McGill University, Montreal, Quebec, Canada
| | - Connie Shen
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
- McGill Research Centre for Complex Traits, McGill University, Montreal, Quebec, Canada
| | - Angelica A Gopal
- McGill Research Centre for Complex Traits, McGill University, Montreal, Quebec, Canada
- Department of Physiology, McGill University, Montreal, Quebec, Canada
- Massachusetts General Hospital, Boston, MA, USA
| | - Todd Douglas
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
- McGill Research Centre for Complex Traits, McGill University, Montreal, Quebec, Canada
| | - Benjamin Forestell
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
- McGill Research Centre for Complex Traits, McGill University, Montreal, Quebec, Canada
| | - Keith D Kauffman
- T Lymphocyte Biology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Dakota Rogers
- McGill Research Centre for Complex Traits, McGill University, Montreal, Quebec, Canada
- Department of Physiology, McGill University, Montreal, Quebec, Canada
| | - Patricio Artusa
- McGill Research Centre for Complex Traits, McGill University, Montreal, Quebec, Canada
- Department of Physiology, McGill University, Montreal, Quebec, Canada
| | - Qian Zhang
- Human Immunological Diseases Section, Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller University, New York, NY, USA
| | - Huie Jing
- Human Immunological Diseases Section, Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Alexandra F Freeman
- Human Immunological Diseases Section, Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Daniel L Barber
- T Lymphocyte Biology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Irah L King
- Meakins-Christie Laboratories, Department of Microbiology and Immunology, McGill University Health Centre Research Institute, Montreal, Quebec, Canada
| | - Maya Saleh
- Department of Medicine, McGill University, Montreal, Quebec, Canada
- University of Bordeaux, Bordeaux, France
| | - Paul W Wiseman
- Department of Chemistry and Department of Physics, McGill University, Montreal, Quebec, Canada
| | - Helen C Su
- Human Immunological Diseases Section, Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Judith N Mandl
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada.
- McGill Research Centre for Complex Traits, McGill University, Montreal, Quebec, Canada.
- Department of Physiology, McGill University, Montreal, Quebec, Canada.
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3
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Gopal AA, Kazarine A, Dubach JM, Wiseman PW. Recent advances in nonlinear microscopy: Deep insights and polarized revelations. Int J Biochem Cell Biol 2020; 130:105896. [PMID: 33253831 DOI: 10.1016/j.biocel.2020.105896] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 11/12/2020] [Accepted: 11/19/2020] [Indexed: 11/16/2022]
Abstract
Nonlinear microscopy is a technique that utilizes nonlinear interactions between light and matter to image fluorescence and scattering phenomena in biological tissues. Very high peak intensities from focused short pulsed lasers are required for nonlinear excitation due to the extremely low probability of the simultaneous arrival of multiple photons of lower energy to excite fluorophores or interact with selective structures for harmonic generation. Combined with reduced scattering from the utilization of longer wavelengths, the inherent spatial confinement associated with achieving simultaneous arrival of photons within the focal volume enables deep imaging with low out-of-focus background for nonlinear imaging. This review provides an introduction to the different contrast mechanisms available with nonlinear imaging and instrumentation commonly used in nonlinear microscopy. Furthermore, we discuss some recent advances in nonlinear microscopy to extend the imaging penetration depth, conduct histopathological investigations on fresh tissues and examine the molecular order and orientation of molecules using polarization nonlinear microscopy.
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Affiliation(s)
- A A Gopal
- Center for Systems Biology and Institute for Innovation in Imaging, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA; Department of Chemistry, McGill University, Montreal, Quebec, Canada
| | - A Kazarine
- Department of Chemistry, McGill University, Montreal, Quebec, Canada
| | - J M Dubach
- Center for Systems Biology and Institute for Innovation in Imaging, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - P W Wiseman
- Department of Chemistry, McGill University, Montreal, Quebec, Canada; Department of Physics, McGill University, Montreal, Quebec, Canada.
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4
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Kazarine A, Gopal AA, Wiseman PW. Nonlinear microscopy of common histological stains reveals third harmonic generation harmonophores. Analyst 2019; 144:3239-3249. [PMID: 30920574 DOI: 10.1039/c9an00267g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Since its invention over a hundred years ago, histological analysis using coloured dye staining remains the gold standard for histopathology. While these stains provide critical information for a variety of diagnostic purposes, they offer limited two-dimensional histological information. Extending classical histological analysis to three dimensions requires novel imaging approaches such as multiphoton microscopy. Multiphoton microscopy enables multimodal, three-dimensional imaging of histologically stained samples. Specifically, third harmonic generation (THG), a nonlinear optical process in which three incident photons are combined into one by the sample, allows high contrast imaging of tissues stained with absorbing dyes, which in turn act as harmonophores. While this technique has previously been applied to hematoxylin and eosin (H&E) tissue sections, we extend this approach to other commonly used histological stains to demonstrate further potential applications of the technique. We demonstrate THG imaging of both human skin and liver tissue stained with H&E, Verhoeff-Van Gieson (VVG) and Picrosirius Red stains. We find that these stains provide excellent contrast as THG harmonophores, enabling high resolution imaging of histological samples. THG imaging of the Verhoeff stain enables easy detection of elastic fibers while Picrosirius Red acts as an effective harmonophore for imaging collagen fibers of all sizes.
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Affiliation(s)
- Alexei Kazarine
- Department of Chemistry, McGill University, 801 Sherbrooke St West, Montreal, QC H3A 0B8, Canada.
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Tong AA, Forestell B, Murphy DV, Nair A, Allen F, Myers J, Klauschen F, Shen C, Gopal AA, Huang AY, Mandl JN. Regulatory T cells differ from conventional
CD
4
+
T cells in their recirculatory behavior and lymph node transit times. Immunol Cell Biol 2019; 97:787-798. [DOI: 10.1111/imcb.12276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 05/20/2019] [Accepted: 05/22/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Alexander A Tong
- Department of Pathology Case Western Reserve University School of Medicine Cleveland OH USA
| | - Benjamin Forestell
- Department of Physiology Department of Microbiology and Immunology McGill Research Centre for Complex Traits McGill University Montreal QC Canada
| | - Daniel V Murphy
- Department of Pediatrics Case Western Reserve University School of Medicine Cleveland OH USA
- The Angie Fowler AYA Cancer Institute UH Rainbow Babies & Children's Hospital Cleveland OH USA
| | - Aditya Nair
- Department of Pediatrics Case Western Reserve University School of Medicine Cleveland OH USA
- The Angie Fowler AYA Cancer Institute UH Rainbow Babies & Children's Hospital Cleveland OH USA
| | - Frederick Allen
- Department of Pathology Case Western Reserve University School of Medicine Cleveland OH USA
| | - Jay Myers
- Department of Pediatrics Case Western Reserve University School of Medicine Cleveland OH USA
- The Angie Fowler AYA Cancer Institute UH Rainbow Babies & Children's Hospital Cleveland OH USA
| | | | - Connie Shen
- Department of Physiology Department of Microbiology and Immunology McGill Research Centre for Complex Traits McGill University Montreal QC Canada
| | - Angelica A Gopal
- Department of Physiology Department of Microbiology and Immunology McGill Research Centre for Complex Traits McGill University Montreal QC Canada
| | - Alex Y Huang
- Department of Pathology Case Western Reserve University School of Medicine Cleveland OH USA
- Department of Pediatrics Case Western Reserve University School of Medicine Cleveland OH USA
- The Angie Fowler AYA Cancer Institute UH Rainbow Babies & Children's Hospital Cleveland OH USA
| | - Judith N Mandl
- Department of Physiology Department of Microbiology and Immunology McGill Research Centre for Complex Traits McGill University Montreal QC Canada
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6
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Kazarine A, Kolosova K, Gopal AA, Wang H, Tahara R, Rammal A, Kost K, Mongeau L, Li-Jessen NYK, Wiseman PW. Multimodal virtual histology of rabbit vocal folds by nonlinear microscopy and nano computed tomography. Biomed Opt Express 2019; 10:1151-1164. [PMID: 30891336 PMCID: PMC6420294 DOI: 10.1364/boe.10.001151] [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] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 01/29/2019] [Accepted: 01/31/2019] [Indexed: 05/31/2023]
Abstract
Human vocal folds (VFs) possess a unique anatomical structure and mechanical properties for human communication. However, VFs are prone to scarring as a consequence of overuse, injury, disease or surgery. Accumulation of scar tissue on VFs inhibits proper phonation and leads to partial or complete loss of voice, with significant consequences for the patient's quality of life. VF regeneration after scarring provides a significant challenge for tissue engineering therapies given the complexity of tissue microarchitecture. To establish an effective animal model for VF injury and scarring, new histological methods are required to visualize the wound repair process of the tissue in its three-dimensional native environment. In this work, we propose the use of a combination of nonlinear microscopy and nanotomography as contrast methods for virtual histology of rabbit VFs. We apply these methods to rabbit VF tissue to demonstrate their use as alternatives to conventional VF histology that may enable future clinical studies of this injury model.
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Affiliation(s)
- Alexei Kazarine
- Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada
| | - Ksenia Kolosova
- Department of Physics, McGill University, 3600 University St., Montreal, QC, H3A 2T8, Canada
| | - Angelica A. Gopal
- Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada
- Department of Physiology, McGill University, 3655 Promenade Sir William Osler, Montreal, H3G 1Y6, Canada
| | - Huijie Wang
- Department of Mechanical Engineering, McGill University, 817 Sherbrooke St. West, Montreal, QC H3A 0C3, Canada
- School of Communication Sciences and Disorders, McGill University, 2001 McGill College Ave., Montreal, QC H3A 1G1, Canada
| | - Rui Tahara
- Redpath Museum, McGill University, 859 Sherbrooke St. West, Montreal, QC H3A 0C4, Canada
| | - Almoaidbellah Rammal
- Department of Otolaryngology – Head and Neck Surgery, McGill University, 1001 Decarie Blvd., Montreal, QC, H4A 3J1, Canada
- Department of Otolaryngology – Head and Neck Surgery, King Abdul-Aziz University, Jeddah, Saudi Arabia
| | - Karen Kost
- Department of Otolaryngology – Head and Neck Surgery, McGill University, 1001 Decarie Blvd., Montreal, QC, H4A 3J1, Canada
| | - Luc Mongeau
- Department of Mechanical Engineering, McGill University, 817 Sherbrooke St. West, Montreal, QC H3A 0C3, Canada
| | - Nicole Y. K. Li-Jessen
- School of Communication Sciences and Disorders, McGill University, 2001 McGill College Ave., Montreal, QC H3A 1G1, Canada
- Department of Otolaryngology – Head and Neck Surgery, McGill University, 1001 Decarie Blvd., Montreal, QC, H4A 3J1, Canada
- Department of Biomedical Engineering, McGill University, 3775 University St., Montreal H3A 2B4, Canada
| | - Paul W. Wiseman
- Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada
- Department of Physics, McGill University, 3600 University St., Montreal, QC, H3A 2T8, Canada
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7
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Kazarine A, Gopal AA, Wiseman PW. Third Harmonic Generation Imaging using Common Histological Dyes. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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8
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Gopal AA, Makarkov AI, Landry N, Ward BJ, Wiseman PW. Intracellular Tracking of Influenza Hemagglutinin in Human Monocyte-Derived Macrophages Measured by Image Cross Correlation Spectroscopy. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.748] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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9
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Abstract
Despite global efforts aimed at its elimination, malaria is still a significant health concern in many countries across the world. The disease is caused by blood-borne parasites, Plasmodium species, and is transmitted by female Anopheles mosquitoes and presents with generic febrile symptoms that are challenging to diagnose clinically. To adequately tackle this issue, an effective detection method is required for screening potential malaria patients for infection. To this day, the gold standard for malaria detection remains basic light microscopy of Giemsa-stained patient blood smears to first enable detection and manual counting to determine the parasite density by a microscopist. While effective at detecting parasites, this method requires both significant time and skilled personnel. As an alternate approach, we propose a new malaria detection method that we call third-harmonic generation image scanning cytometry (THGISC) based on the combination of third-harmonic generation imaging, high-speed motorized scanning, and automated software processing. Third-harmonic generation (THG) is a nonlinear optical process in which the frequency of incident photons is tripled within the sample material. We have previously demonstrated that hemozoin, a metabolic byproduct of the malaria parasite, presents a significant THG signal. We now present a practical approach that uses the selectivity of this contrast mechanism to perform label-free image scanning cytometry of patient blood smears for automated malaria detection. In this work, we applied this technique to lab-cultured parasites and parasites in whole blood obtained from malaria patients. We also compared its effectiveness to parasite counts obtained by classical methods. The ability to easily and rapidly determine parasitemia by THG offers potential not only for the easy confirmation of malaria diagnoses following symptoms, but also the tracking of treatment progress in existing patients, potentially allowing physicians to adjust medication and dosage for each individual.
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Affiliation(s)
- Alexei Kazarine
- Department of Chemistry , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A 0B8 , Canada
| | - Fadi Baakdah
- Institute of Parasitology , McGill University , Sainte Anne de Bellevue , Quebec H9X 3 V9 , Canada
| | - Angelica A Gopal
- Department of Chemistry , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A 0B8 , Canada
| | - Wellington Oyibo
- ANDI Centre of Excellence for Malaria Diagnosis, College of Medicine , University of Lagos , Idi-Araba, Lagos 100254 , Nigeria
| | - Elias Georges
- Institute of Parasitology , McGill University , Sainte Anne de Bellevue , Quebec H9X 3 V9 , Canada
| | - Paul W Wiseman
- Department of Chemistry , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A 0B8 , Canada.,Department of Physics , McGill University , 3600 University Street , Montreal , Quebec H3A 2T8 , Canada
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10
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Gopal AA, Ricoult SG, Harris SN, Juncker D, Kennedy TE, Wiseman PW. Spatially Selective Dissection of Signal Transduction in Neurons Grown on NETRIN-1 Printed Nanoarrays via Segmented Fluorescence Fluctuation Analysis. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.1930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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11
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Gopal AA, Ricoult SG, Harris SN, Juncker D, Kennedy TE, Wiseman PW. Spatially Selective Dissection of Signal Transduction in Neurons Grown on Netrin-1 Printed Nanoarrays via Segmented Fluorescence Fluctuation Analysis. ACS Nano 2017; 11:8131-8143. [PMID: 28679208 DOI: 10.1021/acsnano.7b03004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Axonal growth cones extend during neural development in response to precise distributions of extracellular cues. Deleted in colorectal cancer (DCC), a receptor for the chemotropic guidance cue netrin-1, directs F-actin reorganization, and is essential for mammalian neural development. To elucidate how the extracellular distribution of netrin-1 influences the distribution of DCC and F-actin within axonal growth cones, we patterned nanoarrays of substrate bound netrin-1 using lift-off nanocontact printing. The distribution of DCC and F-actin in embryonic rat cortical neuron growth cones was then imaged using total internal reflection fluorescence (TIRF) microscopy. Fluorescence fluctuation analysis via image cross-correlation spectroscopy (ICCS) was applied to extract the molecular density and aggregation state of DCC and F-actin, identifying the fraction of DCC and F-actin colocalizing with the patterned netrin-1 substrate. ICCS measurement of spatially segmented images based on the substrate nanodot patterns revealed distinct molecular distributions of F-actin and DCC in regions directly overlying the nanodots compared to over the reference surface surrounding the nanodots. Quantifiable variations between the populations of DCC and F-actin on and off the nanodots reveal specific responses to the printed protein substrate. We report that nanodots of substrate-bound netrin-1 locally recruit and aggregate DCC and direct F-actin organization. These effects were blocked by tetanus toxin, consistent with netrin-1 locally recruiting DCC to the plasma membrane via a VAMP2-dependent mechanism. Our findings demonstrate the utility of segmented ICCS image analysis, combined with precisely patterned immobilized ligands, to reveal local receptor distribution and signaling within specialized subcellular compartments.
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Affiliation(s)
- Angelica A Gopal
- Department of Chemistry, ‡Department of Neurology and Neurosurgery, Montreal Neurological Institute, §Department of Biomedical Engineering, Genome Quebec Innovation Centre, and ∥Department of Physics, McGill University , Montreal, Quebec H3A 0G4 Canada
| | - Sebastien G Ricoult
- Department of Chemistry, ‡Department of Neurology and Neurosurgery, Montreal Neurological Institute, §Department of Biomedical Engineering, Genome Quebec Innovation Centre, and ∥Department of Physics, McGill University , Montreal, Quebec H3A 0G4 Canada
| | - Stephanie N Harris
- Department of Chemistry, ‡Department of Neurology and Neurosurgery, Montreal Neurological Institute, §Department of Biomedical Engineering, Genome Quebec Innovation Centre, and ∥Department of Physics, McGill University , Montreal, Quebec H3A 0G4 Canada
| | - David Juncker
- Department of Chemistry, ‡Department of Neurology and Neurosurgery, Montreal Neurological Institute, §Department of Biomedical Engineering, Genome Quebec Innovation Centre, and ∥Department of Physics, McGill University , Montreal, Quebec H3A 0G4 Canada
| | - Timothy E Kennedy
- Department of Chemistry, ‡Department of Neurology and Neurosurgery, Montreal Neurological Institute, §Department of Biomedical Engineering, Genome Quebec Innovation Centre, and ∥Department of Physics, McGill University , Montreal, Quebec H3A 0G4 Canada
| | - Paul W Wiseman
- Department of Chemistry, ‡Department of Neurology and Neurosurgery, Montreal Neurological Institute, §Department of Biomedical Engineering, Genome Quebec Innovation Centre, and ∥Department of Physics, McGill University , Montreal, Quebec H3A 0G4 Canada
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12
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Gopal AA, Rappaz B, Rouger V, Martyn IB, Dahlberg PD, Meland RJ, Beamish IV, Kennedy TE, Wiseman PW. Netrin-1-Regulated Distribution of UNC5B and DCC in Live Cells Revealed by TICCS. Biophys J 2017; 110:623-634. [PMID: 26840727 DOI: 10.1016/j.bpj.2015.12.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [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: 09/21/2015] [Revised: 12/16/2015] [Accepted: 12/21/2015] [Indexed: 01/01/2023] Open
Abstract
Netrins are secreted proteins that direct cell migration and adhesion during development. Netrin-1 binds its receptors deleted in colorectal cancer (DCC) and the UNC5 homologs (UNC5A-D) to activate downstream signaling that ultimately directs cytoskeletal reorganization. To investigate how netrin-1 regulates the dynamic distribution of DCC and UNC5 homologs, we applied fluorescence confocal and total internal reflection fluorescence microscopy, and sliding window temporal image cross correlation spectroscopy, to measure time profiles of the plasma membrane distribution, aggregation state, and interaction fractions of fluorescently tagged netrin receptors expressed in HEK293T cells. Our measurements reveal changes in receptor aggregation that are consistent with netrin-1-induced recruitment of DCC-enhanced green fluorescent protein (EGFP) from intracellular vesicles to the plasma membrane. Netrin-1 also induced colocalization of coexpressed full-length DCC-EGFP with DCC-T-mCherry, a putative DCC dominant negative that replaces the DCC intracellular domain with mCherry, consistent with netrin-1-induced receptor oligomerization, but with no change in aggregation state with time, providing evidence that signaling via the DCC intracellular domain triggers DCC recruitment to the plasma membrane. UNC5B expressed alone was also recruited by netrin-1 to the plasma membrane. Coexpressed DCC and UNC5 homologs are proposed to form a heteromeric netrin-receptor complex to mediate a chemorepellent response. Application of temporal image cross correlation spectroscopy to image series of cells coexpressing UNC5B-mCherry and DCC-EGFP revealed a netrin-1-induced increase in colocalization, with both receptors recruited to the plasma membrane from preexisting clusters, consistent with vesicular recruitment and receptor heterooligomerization. Plasma membrane recruitment of DCC or UNC5B was blocked by application of the netrin-1 VI-V peptide, which fails to activate chemoattraction, or by pharmacological block of Src family kinase signaling, consistent with receptor recruitment requiring netrin-1-activated signaling. Our findings reveal a mechanism activated by netrin-1 that recruits DCC and UNC5B to the plasma membrane.
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Affiliation(s)
- Angelica A Gopal
- Department of Chemistry, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Benjamin Rappaz
- McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Physics, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Vincent Rouger
- Department of Chemistry, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Iain B Martyn
- Department of Physics, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Peter D Dahlberg
- Department of Physics, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Rachel J Meland
- Department of Chemistry, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Ian V Beamish
- McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Timothy E Kennedy
- McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Paul W Wiseman
- Department of Chemistry, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Physics, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.
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13
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Rouger V, Alchini R, Kazarine A, Gopal AA, Girouard MP, Fournier AE, Wiseman PW. Low-cost multimodal light sheet microscopy for optically cleared tissues and living specimens. J Biomed Opt 2016; 21:126008. [PMID: 27999866 DOI: 10.1117/1.jbo.21.12.126008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 11/21/2016] [Indexed: 06/06/2023]
Abstract
Light sheet microscopy techniques have expanded with designs to address many new applications. Due to rapid advancements in computing power, camera/detector technologies, and tissue clearing techniques, light sheet methods are becoming increasingly popular for biomedical imaging applications at the cellular and tissue levels. Light sheet imaging modalities couple rapid imaging rates, low-levels of phototoxicity, and excellent signal to noise ratios, contributing to their popularity for experimental biology. However, the current major limitation of light sheet microscopy arises from optical aberrations, with the main drawback being the defocusing introduced by refractive index variations that accompany clearing techniques. Here, we propose an inexpensive and easy to build light sheet based instrumentation to overcome this limitation by optomechanically decoupling the sample scanning movement from the detection step. Our solution is relatively simple to implement and also provides increased modularity by using a swappable excitation arm. This expands the range of samples we can image on a single system, from high resolution for single cells at ? m spatial resolution, to tissues with mm spatial resolution. We demonstrate our approach, using the system to image iDISCO cleared embryos and sciatic nerves, and provide the full three-dimensional reconstruction of these objects in minutes.
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Affiliation(s)
- Vincent Rouger
- McGill University, Department of Chemistry, 801 Sherbrooke Street, West, Montreal, Quebec H3A 0B8, Canada
| | - Ricardo Alchini
- McGill University, Montreal Neurological Institute, Department of Neurology, 3801 University Street, Montreal, Quebec H3A 2B4, Canada
| | - Alexei Kazarine
- McGill University, Department of Chemistry, 801 Sherbrooke Street, West, Montreal, Quebec H3A 0B8, Canada
| | - Angelica A Gopal
- McGill University, Department of Chemistry, 801 Sherbrooke Street, West, Montreal, Quebec H3A 0B8, Canada
| | - Marie-Pier Girouard
- McGill University, Montreal Neurological Institute, Department of Neurology, 3801 University Street, Montreal, Quebec H3A 2B4, Canada
| | - Alyson E Fournier
- McGill University, Montreal Neurological Institute, Department of Neurology, 3801 University Street, Montreal, Quebec H3A 2B4, Canada
| | - Paul W Wiseman
- McGill University, Department of Chemistry, 801 Sherbrooke Street, West, Montreal, Quebec H3A 0B8, CanadacMcGill University, Department of Physics, 3600 University Street, Montreal, Quebec H3A 2T8, Canada
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