University of Guelph Thesis Template
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Plasma Pattern Recognition Receptors of Walleye (Sander vitreus M.) with an Emphasis on Mannose-binding Lectin-Like Protein and Viral Hemorrhagic Septicemia Virus by Mary Alexandra Reid A Thesis presented to The University of Guelph In partial fulfilment of requirements for the degree of Doctor of Philosophy in Pathobiology Guelph, Ontario, Canada © Mary Alexandra Reid, May, 2012 ABSTRACT PLASMA PATTERN RECOGNITION RECEPTORS OF WALLEYE (SANDER VITREUS M.) WITH AN EMPHASIS ON MANNOSE-BINDING LECTIN-LIKE PROTEIN AND VIRAL HEMORRHAGIC SEPTICEMIA VIRUS Alexandra Reid Advisor: University of Guelph, 2012 Professor John Lumsden Walleye (Sander vitreus M.) are valuable in commercial and recreational fisheries and are affected by bacterial, fungal and viral disease. Pattern recognition receptors (PRRs) are germline-encoded and constitutively expressed and bind non-self or altered- self for immune recognition. Walleye were hypothesised to have circulating PRRs that were capable of binding diverse pathogens. These PRRs were hypothesised to increase with infection, be distributed in immunologically relevant tissues and to be strain and age specific. PRR binding was measured by affinity chromatography, plasma binding assays, SDS-PAGE, Western blots, ELISA, PCR, and immunohistochemistry. ELISA and affinity chromatography assays were developed in rainbow trout (Oncorhynchus mykiss) with known PRRs. Trout ladderlectin was confirmed as a PRR binding viral hemorrhagic septicemia virus (VHSV). These techniques were adapted to walleye using Flavobacterium columnare, chitin, VHSV and Sepharose resin. A 22 kDa protein bound to F. columnare, a 17 kDa protein bound to chitin and a 34 kDa protein bound to VHSV were identified as similar to bass apolipoprotein, carp C3 and rainbow trout intelectin, respectively. PCR and 3'-RACE-PCR were used to generate nucleotide sequence to confirm identity of walleye apolipoprotein and mannose-binding lectin (MBL)-like protein from the intelectin-like sequence. Two rabbit polyclonal antibodies were raised to 34 and 67 kDa MBL amino acid sequences and used to verify MBL-like protein as a PRR for VHSV. Healthy walleye MBL-like protein plasma concentration was 7.5 ng/ml. Significant differences were found between geographically distant strains of walleye. An ELISA demonstrated that MBL-like protein had significant differences in binding affinity between multiple strains of VHSV and different viruses found in Ontario. MBL-like protein plasma levels increased with initial infection of naïve fish with waterborne and IP VHSV (107 pfu) but did not change with IP reinfection. Previous infection with VHSV significantly decreased walleye mortality. IHC of walleye shows MBL-like protein is distributed in epithelial surfaces, primarily skin, oropharynx, gill, gastrointestinal system, renal nephrons, connective tissue of gonads and plasma. There was no qualitative difference in MBL-like protein tissue distribution in healthy and VHSV-infected walleye. This is the first evidence for fish lectins binding viruses. ACKNOWLEDGEMENTS Mistahi ninanāskomāwak ēkwa nisākihāwak nināpēm, niwāhkōmākanak, nitōtēmak ēkwa niwītapimākanak. Kahkiyaw ōki nikī-pē-wīcihikwak mēkwāc kā- kiskinohamākawiyān. Namōya nika-kī-kaskihtān kīspin ēkāya kiyawāw ē-ohci- wīcihiyēk. Pocin, Maugre ēkwa Macaroni, tāpitawi. Thank you to my supervisor, Dr. John Lumsden and our technician, Mr. Paul Huber, as well as the rest of the FPL (past and present) for their assistance and support. I would like to thank the OVC community for frequent questions and help. I am grateful for the funding I have received from the Ontario Graduate Scholarship program and the OVC Fellowship program for providing financial assistance to allow me to complete my studies, as well as NSERC Strategic and Discovery grants and the Great Lakes Fisheries Commission for funding our VHSV research. iv DECLARATION OF WORK PERFORMED All work reported in this thesis was performed by myself under supervision of Dr. John Lumsden and my advisory committee; Dr. Brian Dixon, Dr. Claire Jardine, and Dr. Sarah Wootton, with following exceptions: Karrie Young assisted with the ladderlectin and intelectin ELISAs and in developing the rainbow trout – VHSV-Toyopearl assay in Chapter 2. Adrian Di Natale assisted with running many, many PCRs in Chapter 3. Dr. Jiaxi Wang at Queen's University conducted all mass spectrometry in Chapter 3. Mr. Nguyen Vo cultured the VHSV drum strain in the walleye WECF11f cell line for Chapter 4. Mr. Stephen Lord and Ms. Melinda Raymond from the Fish Health Laboratory, University of Guelph performed all virus isolations from experimental fish before and after infection in Chapter 4. Katrina Blackburn and the rest of the FPL assisted with evening checking of trial fish in Chapter 4. Dr. Stephen Reid, Mr. Tyler Flockhart and Mr. Leonard Shirose assisted in choosing appropriate statistical methods for Chapter 4. v TABLE OF CONTENTS Acknowledgements...............................................................................................................i Declaration of Work Performed ..........................................................................................ii Table of Contents................................................................................................................iii List of Tables.....................................................................................................................xix List of Figures ...................................................................................................................xx List of Abbreviations......................................................................................................xxiii Chapter One General Introduction............................................................................................................1 Literature Review.................................................................................................................2 1.1 Known Diseases of Walleye in Ontario, Canada...........................................................2 1.1.1 Columnaris in Walleye................................................................................2 1.1.2 Fungal and Metazoan Pathogens of Walleye..............................................3 1.1.3 Tumour-Forming Viral Pathogens of Walleye............................................4 1.1.4 Viral Hemorrhagic Septicemia Virus in Walleye........................................5 1.2 Pattern Recognition Receptors of Fish Involved in Innate Immune Recognition........7 vi 1.2.1 Epithelial Mucus-Associated Pattern Recognition Receptors....................8 1.2.2 Complement...............................................................................................9 1.2.3 Soluble Defense Lectins...........................................................................14 1.2.4 Natural Antibodies....................................................................................22 1.2.5 Toll-like Receptors...................................................................................23 1.2.6 Nucleotide-Binding Oligomerization Domain (NOD)-Like Receptors...26 1.2.7 RNA Helicases .........................................................................................27 1.2.8 Cellular Components................................................................................27 1.3 Interferons: Upregulators of Pattern Recognition Receptors in the Induced Antiviral Response............................................................................................................................30 1.3.1 Mx GTPases..................................................................................................32 1.3.2 ISG15............................................................................................................33 1.3.3 Protein Kinase R...........................................................................................33 1.3.4 Virus-Induced Gene 1...................................................................................34 1.3.5 Tumour Necrosis Factor α ...........................................................................35 1.4. Study Rationale..........................................................................................................36 Chapter Two Rainbow Trout Ladderlectin, but not Intelectin, Binds Viral Hemorrhagic Septicemia Virus IVb............................................................................................................................39 vii 2.1 Abstract........................................................................................................................39 2.2 Introduction.................................................................................................................40 2.3 Materials and Methods................................................................................................43 2.3.1 Plasma Binding Assays.............................................................................43 2.3.2 Indirect Enzyme-Linked Immunoassay (ELISA) for Lectin Binding to VHSV ..............................................................................................................44 2.3.3 VHSV-Conjugated Toyopearl Column Assay..........................................45 2.3.4 One-Dimensional Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis (1-D SDS PAGE)....................................................................46 2.3.5 Slot Immunoblot.......................................................................................47