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Muñoz-Bucio A, Arellano-Reynoso B, Sangari FJ, Sieira R, Thébault P, Espitia C, García Lobo JM, Seoane A, Suárez-Güemes F. Increased Brucella abortus asRNA_0067 expression under intraphagocytic stressors is associated with enhanced virB2 transcription. Arch Microbiol 2024; 206:285. [PMID: 38816572 PMCID: PMC11139718 DOI: 10.1007/s00203-024-03984-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 04/27/2024] [Indexed: 06/01/2024]
Abstract
Intracellular pathogens like Brucella face challenges during the intraphagocytic adaptation phase, where the modulation of gene expression plays an essential role in taking advantage of stressors to persist inside the host cell. This study aims to explore the expression of antisense virB2 RNA strand and related genes under intracellular simulation media. Sense and antisense virB2 RNA strands increased expression when nutrient deprivation and acidification were higher, being starvation more determinative. Meanwhile, bspB, one of the T4SS effector genes, exhibited the highest expression during the exposition to pH 4.5 and nutrient abundance. Based on RNA-seq analysis and RACE data, we constructed a regional map depicting the 5' and 3' ends of virB2 and the cis-encoded asRNA_0067. Without affecting the CDS or a possible autonomous RBS, we generate the deletion mutant ΔasRNA_0067, significantly reducing virB2 mRNA expression and survival rate. These results suggest that the antisense asRNA_0067 expression is promoted under exposure to the intraphagocytic adaptation phase stressors, and its deletion is associated with a lower transcription of the virB2 gene. Our findings illuminate the significance of these RNA strands in modulating the survival strategy of Brucella within the host and emphasize the role of nutrient deprivation in gene expression.
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Affiliation(s)
- Adrian Muñoz-Bucio
- Facultad de Medicina Veterinaria y Zootecnia, Departamento de Microbiología e Inmunología. Circuito Exterior S/N, Universidad Nacional Autónoma de México, CDMX, Ciudad Universitaria, Coyoacán, 04510, Mexico
| | - Beatriz Arellano-Reynoso
- Facultad de Medicina Veterinaria y Zootecnia, Departamento de Microbiología e Inmunología. Circuito Exterior S/N, Universidad Nacional Autónoma de México, CDMX, Ciudad Universitaria, Coyoacán, 04510, Mexico
| | - Félix J Sangari
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC), Universidad de Cantabria-CSIC-SODERCAN, C. Albert Einstein 22, 39011, Santander, Cantabria, Spain
| | - Rodrigo Sieira
- Fundación Instituto Leloir-IIBBA CONICET, Av. Patricias Argentinas 435CABA, CP. 1405, Buenos Aires Argentina, Argentina
| | - Patricia Thébault
- Laboratoire Bordelais de Recherche en Informatique (LaBRI), UMR 5800, CNRS, Bordeaux INP, Université de Bordeaux, 33400, Talence, France
| | - Clara Espitia
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México MX, CDMX, Circuito Escolar 33, Ciudad Universitaria, Coyoacán, 04510, Mexico
| | - Juan M García Lobo
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC), Universidad de Cantabria-CSIC-SODERCAN, C. Albert Einstein 22, 39011, Santander, Cantabria, Spain
| | - Asunción Seoane
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC), Universidad de Cantabria-CSIC-SODERCAN, C. Albert Einstein 22, 39011, Santander, Cantabria, Spain
| | - Francisco Suárez-Güemes
- Facultad de Medicina Veterinaria y Zootecnia, Departamento de Microbiología e Inmunología. Circuito Exterior S/N, Universidad Nacional Autónoma de México, CDMX, Ciudad Universitaria, Coyoacán, 04510, Mexico.
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2
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Hissen KL, He W, Wu G, Criscitiello MF. Immunonutrition: facilitating mucosal immune response in teleost intestine with amino acids through oxidant-antioxidant balance. Front Immunol 2023; 14:1241615. [PMID: 37841275 PMCID: PMC10570457 DOI: 10.3389/fimmu.2023.1241615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 08/24/2023] [Indexed: 10/17/2023] Open
Abstract
Comparative animal models generate fundamental scientific knowledge of immune responses. However, these studies typically are conducted in mammals because of their biochemical and physiological similarity to humans. Presently, there has been an interest in using teleost fish models to study intestinal immunology, particularly intestinal mucosa immune response. Instead of targeting the pathogen itself, a preferred approach for managing fish health is through nutrient supplementation, as it is noninvasive and less labor intensive than vaccine administrations while still modulating immune properties. Amino acids (AAs) regulate metabolic processes, oxidant-antioxidant balance, and physiological requirements to improve immune response. Thus, nutritionists can develop sustainable aquafeeds through AA supplementation to promote specific immune responses, including the intestinal mucosa immune system. We propose the use of dietary supplementation with functional AAs to improve immune response by discussing teleost fish immunology within the intestine and explore how oxidative burst is used as an immune defense mechanism. We evaluate immune components and immune responses in the intestine that use oxidant-antioxidant balance through potential selection of AAs and their metabolites to improve mucosal immune capacity and gut integrity. AAs are effective modulators of teleost gut immunity through oxidant-antioxidant balance. To incorporate nutrition as an immunoregulatory means in teleost, we must obtain more tools including genomic, proteomic, nutrition, immunology, and macrobiotic and metabonomic analyses, so that future studies can provide a more holistic understanding of the mucosal immune system in fish.
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Affiliation(s)
- Karina L. Hissen
- Comparative Immunogenetics Laboratory Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, United States
| | - Wenliang He
- Amino Acid Laboratory, Department of Animal Science, Texas A&M University, College Station, TX, United States
| | - Guoyao Wu
- Amino Acid Laboratory, Department of Animal Science, Texas A&M University, College Station, TX, United States
| | - Michael F. Criscitiello
- Comparative Immunogenetics Laboratory Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, United States
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science Center, Texas A&M University, Bryan, TX, United States
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3
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Wells KM, He K, Pandey A, Cabello A, Zhang D, Yang J, Gomez G, Liu Y, Chang H, Li X, Zhang H, Feng X, da Costa LF, Metz R, Johnson CD, Martin CL, Skrobarczyk J, Berghman LR, Patrick KL, Leibowitz J, Ficht A, Sze SH, Song J, Qian X, Qin QM, Ficht TA, de Figueiredo P. Brucella activates the host RIDD pathway to subvert BLOS1-directed immune defense. eLife 2022; 11:e73625. [PMID: 35587649 PMCID: PMC9119680 DOI: 10.7554/elife.73625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Accepted: 04/26/2022] [Indexed: 11/18/2022] Open
Abstract
The phagocytosis and destruction of pathogens in lysosomes constitute central elements of innate immune defense. Here, we show that Brucella, the causative agent of brucellosis, the most prevalent bacterial zoonosis globally, subverts this immune defense pathway by activating regulated IRE1α-dependent decay (RIDD) of Bloc1s1 mRNA encoding BLOS1, a protein that promotes endosome-lysosome fusion. RIDD-deficient cells and mice harboring a RIDD-incompetent variant of IRE1α were resistant to infection. Inactivation of the Bloc1s1 gene impaired the ability to assemble BLOC-1-related complex (BORC), resulting in differential recruitment of BORC-related lysosome trafficking components, perinuclear trafficking of Brucella-containing vacuoles (BCVs), and enhanced susceptibility to infection. The RIDD-resistant Bloc1s1 variant maintains the integrity of BORC and a higher-level association of BORC-related components that promote centrifugal lysosome trafficking, resulting in enhanced BCV peripheral trafficking and lysosomal destruction, and resistance to infection. These findings demonstrate that host RIDD activity on BLOS1 regulates Brucella intracellular parasitism by disrupting BORC-directed lysosomal trafficking. Notably, coronavirus murine hepatitis virus also subverted the RIDD-BLOS1 axis to promote intracellular replication. Our work establishes BLOS1 as a novel immune defense factor whose activity is hijacked by diverse pathogens.
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Affiliation(s)
- Kelsey Michelle Wells
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
| | - Kai He
- Department of Electrical and Computer Engineering, Texas A&M UniversityCollege StationUnited States
| | - Aseem Pandey
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
- Department of Veterinary Pathobiology, Texas A&M UniversityCollege StationUnited States
| | - Ana Cabello
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
- Department of Veterinary Pathobiology, Texas A&M UniversityCollege StationUnited States
| | - Dongmei Zhang
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
| | - Jing Yang
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
| | - Gabriel Gomez
- Texas A&M Veterinary Medical Diagnostic Laboratory, Texas A&M UniversityCollege StationUnited States
| | - Yue Liu
- College of Plant Sciences, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin UniversityJilinChina
| | - Haowu Chang
- Key Laboratory of Symbolic Computation and Knowledge Engineering, Ministry of Education, College of Computer Science and Technology, Jilin UniversityChangchunChina
| | - Xueqiang Li
- Key Laboratory of Symbolic Computation and Knowledge Engineering, Ministry of Education, College of Computer Science and Technology, Jilin UniversityChangchunChina
| | - Hao Zhang
- Key Laboratory of Symbolic Computation and Knowledge Engineering, Ministry of Education, College of Computer Science and Technology, Jilin UniversityChangchunChina
| | - Xuehuang Feng
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
| | | | - Richard Metz
- Genomics and Bioinformatics Services, Texas A&M UniversityCollege StationUnited States
| | - Charles D Johnson
- Genomics and Bioinformatics Services, Texas A&M UniversityCollege StationUnited States
| | - Cameron Lee Martin
- Department of Poultry Science, Texas A&M UniversityCollege StationUnited States
| | - Jill Skrobarczyk
- Department of Poultry Science, Texas A&M UniversityCollege StationUnited States
| | - Luc R Berghman
- Department of Poultry Science, Texas A&M UniversityCollege StationUnited States
| | - Kristin L Patrick
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
| | - Julian Leibowitz
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
| | - Allison Ficht
- Department of Molecular and Cellular Medicine, College of Medicine, Texas A&M Health Science CenterCollege StationUnited States
| | - Sing-Hoi Sze
- Department of Computer Science and Engineering, Dwight Look College of Engineering, Texas A&M UniversityCollege StationUnited States
- Department of Biochemistry & Biophysics, Texas A&M UniversityCollege StationUnited States
| | - Jianxun Song
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
| | - Xiaoning Qian
- Department of Electrical and Computer Engineering, Texas A&M UniversityCollege StationUnited States
- TEES-AgriLife Center for Bioinformatics & Genomic Systems Engineering, Texas A&M UniversityCollege StationUnited States
| | - Qing-Ming Qin
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
- College of Plant Sciences, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin UniversityJilinChina
| | - Thomas A Ficht
- Department of Veterinary Pathobiology, Texas A&M UniversityCollege StationUnited States
| | - Paul de Figueiredo
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science CenterBryanUnited States
- Department of Veterinary Pathobiology, Texas A&M UniversityCollege StationUnited States
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4
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Chen S, Zhang D, Roberts AJ, Lu HC, Cannon CL, Qin QM, de Figueiredo P. Host Protease Activity on Bacterial Pathogens Promotes Complement and Antibiotic-Directed Killing. Pathogens 2021; 10:pathogens10111506. [PMID: 34832660 PMCID: PMC8618517 DOI: 10.3390/pathogens10111506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/12/2021] [Accepted: 11/12/2021] [Indexed: 11/16/2022] Open
Abstract
Our understanding of how the host immune system thwarts bacterial evasive mechanisms remains incomplete. Here, we show that host protease neutrophil elastase acts on Acinetobacter baumannii and Pseudomonas aeruginosa to destroy factors that prevent serum-associated, complement-directed killing. The protease activity also enhances bacterial susceptibility to antibiotics in sera. These findings implicate a new paradigm where host protease activity on bacteria acts combinatorially with the host complement system and antibiotics to defeat bacterial pathogens.
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Affiliation(s)
- Shaorong Chen
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX 77807, USA; (S.C.); (D.Z.); (A.-J.R.); (H.-C.L.); (C.L.C.)
| | - Dongmei Zhang
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX 77807, USA; (S.C.); (D.Z.); (A.-J.R.); (H.-C.L.); (C.L.C.)
| | - Alexandria-Jade Roberts
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX 77807, USA; (S.C.); (D.Z.); (A.-J.R.); (H.-C.L.); (C.L.C.)
| | - Hsueh-Chung Lu
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX 77807, USA; (S.C.); (D.Z.); (A.-J.R.); (H.-C.L.); (C.L.C.)
| | - Carolyn L. Cannon
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX 77807, USA; (S.C.); (D.Z.); (A.-J.R.); (H.-C.L.); (C.L.C.)
| | - Qing-Ming Qin
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX 77807, USA; (S.C.); (D.Z.); (A.-J.R.); (H.-C.L.); (C.L.C.)
- Correspondence: (Q.-M.Q.); (P.d.F.)
| | - Paul de Figueiredo
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX 77807, USA; (S.C.); (D.Z.); (A.-J.R.); (H.-C.L.); (C.L.C.)
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX 77843, USA
- Correspondence: (Q.-M.Q.); (P.d.F.)
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5
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Allegro AR, Barhoumi R, Bordin AI, Bray JM, Cohen ND. Uptake and replication in Acanthamoeba castellanii of a virulent (pVAPA-positive) strain of Rhodococcus equi and its isogenic, plasmid-cured strain. Vet Microbiol 2021; 257:109069. [PMID: 33862330 DOI: 10.1016/j.vetmic.2021.109069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 04/07/2021] [Indexed: 11/16/2022]
Abstract
Rhodococcus equi is a soil saprophytic bacterium and intracellular pathogen that causes pneumonia in foals. Strains of R. equi that are virulent in foals contain a plasmid that encodes a virulence-associated protein A (VapA) necessary for replication in macrophages. Because other intracellular pathogens survive and replicate inside amoebae, we postulated that the VapA-bearing plasmid (pVAPA) confers a survival advantage for R. equi against environmental predators like amoebae. To test this hypothesis, we compared phagocytosis by and survival in Acanthamoeba castellanii of isogenic strains of pVAPA-positive and pVAPA-negative R. equi. Phagocytosis of the pVAPA-negative strain by A. castellanii was significantly (P < 0.0001) greater than the pVAPA-positive strain. Intracellular replication of the pVAPA-positive strain in A. castellanii was significantly (P < 0.0001) greater than the pVAPA-negative strain during both 48 h and 9 days. These results indicate that the presence of the VapA plasmid reduces uptake and aids replication of R. equi in A. castellanii.
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Affiliation(s)
- Angelica R Allegro
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4475, United States
| | - Rola Barhoumi
- Image Analysis Laboratory, Department of Veterinary Integrative Biosciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4458, United States
| | - Angela I Bordin
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4475, United States
| | - Jocelyne M Bray
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4475, United States
| | - Noah D Cohen
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4475, United States.
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6
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Ott JA, Ohta Y, Flajnik MF, Criscitiello MF. Lost structural and functional inter-relationships between Ig and TCR loci in mammals revealed in sharks. Immunogenetics 2021; 73:17-33. [PMID: 33449123 PMCID: PMC7909615 DOI: 10.1007/s00251-020-01183-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 10/26/2020] [Indexed: 12/19/2022]
Abstract
Immunoglobulins and T cell receptors (TCR) have obvious structural similarities as well as similar immunogenetic diversification and selection mechanisms. Nevertheless, the two receptor systems and the loci that encode them are distinct in humans and classical murine models, and the gene segments comprising each repertoire are mutually exclusive. Additionally, while both B and T cells employ recombination-activating genes (RAG) for primary diversification, immunoglobulins are afforded a supplementary set of activation-induced cytidine deaminase (AID)-mediated diversification tools. As the oldest-emerging vertebrates sharing the same adaptive B and T cell receptor systems as humans, extant cartilaginous fishes allow a potential view of the ancestral immune system. In this review, we discuss breakthroughs we have made in studies of nurse shark (Ginglymostoma cirratum) T cell receptors demonstrating substantial integration of loci and diversification mechanisms in primordial B and T cell repertoires. We survey these findings in this shark model where they were first described, while noting corroborating examples in other vertebrate groups. We also consider other examples where the gnathostome common ancestry of the B and T cell receptor systems have allowed dovetailing of genomic elements and AID-based diversification approaches for the TCR. The cartilaginous fish seem to have retained this T/B cell plasticity to a greater extent than more derived vertebrate groups, but representatives in all vertebrate taxa except bony fish and placental mammals show such plasticity.
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Affiliation(s)
- Jeannine A Ott
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, 77843, USA
| | - Yuko Ohta
- Department of Microbiology and Immunology, University of Maryland Baltimore School of Medicine, Baltimore, MD, 21201, USA
| | - Martin F Flajnik
- Department of Microbiology and Immunology, University of Maryland Baltimore School of Medicine, Baltimore, MD, 21201, USA
| | - Michael F Criscitiello
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, 77843, USA.
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science Center, Texas A&M University, College Station, TX, 77843, USA.
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7
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Duckworth EEM, Romoser KR, Ott JA, Deiss TC, Gulland FMD, Criscitiello MF. Using PacBio SMRT data for identification of class I MHC alleles in a wildlife species, Zalophus californianus (California sea lion). INFECTION GENETICS AND EVOLUTION 2020; 88:104700. [PMID: 33387691 DOI: 10.1016/j.meegid.2020.104700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 12/24/2020] [Accepted: 12/28/2020] [Indexed: 10/22/2022]
Abstract
High allelic polymorphism and association with disease susceptibility has made the genes encoding major histocompatibility complex (MHC) antigen presentation molecules in humans, domesticated animals, and wildlife species of wide interest to ecologists, evolutionary biologists, and health specialists. The often multifaceted polygenism and extreme polymorphism of this immunogenetic system have made it especially difficult to characterize in non-model species. Here we compare and contrast the workflows of traditional Sanger sequencing of plasmid-cloned amplicons to Pacific Biosciences SMRT circular consensus sequencing (CCS) in their ability to capture alleles of MHC class I in a wildlife species where characterization of these genes was absent. We assessed two California sea lions (Zalophus californianus), a species suffering from a high prevalence of an aggressive cancer associated with a sexually transmitted gamma herpesvirus. In this pilot study, SMRT CCS proved superior in identifying more alleles from each animal than the more laborious plasmid cloning/Sanger workflow (12:7, 10:7), and no alleles were identified with the cloning/Sanger approach that were not identified by SMRT CCS. We discuss the advantages and disadvantages of each approach including cost, allele rarefaction, and sequence fidelity.
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Affiliation(s)
- Ellen E M Duckworth
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA; Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA.
| | - Kaitlyn R Romoser
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA.
| | - Jeannine A Ott
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA.
| | - Thaddeus C Deiss
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA.
| | | | - Michael F Criscitiello
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA; Department of Molecular Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science Center, Bryan, TX 77807, USA.
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8
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Salazar-Medina AJ, Velazquez-Contreras EF, Sugich-Miranda R, Santacruz H, Navarro RE, Rocha-Alonzo F, Islas-Osuna MA, Chen PL, Christian SGB, Romoser AA, Dindot SV, Sayes CM, Sotelo-Mundo RR, Criscitiello MF. Immune response of human cultured cells towards macrocyclic Fe 2PO and Fe 2PC bioactive cyclophane complexes. PeerJ 2020; 8:e8956. [PMID: 32341898 PMCID: PMC7179565 DOI: 10.7717/peerj.8956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 03/21/2020] [Indexed: 11/20/2022] Open
Abstract
Synthetic molecules that mimic the function of natural enzymes or molecules have untapped potential for use in the next generation of drugs. Cyclic compounds that contain aromatic rings are macrocyclic cyclophanes, and when they coordinate iron ions are of particular interest due to their antioxidant and biomimetic properties. However, little is known about the molecular responses at the cellular level. This study aims to evaluate the changes in immune gene expression in human cells exposed to the cyclophanes Fe2PO and Fe2PC. Confluent human embryonic kidney cells were exposed to either the cyclophane Fe2PO or Fe2PC before extraction of RNA. The expression of a panel of innate and adaptive immune genes was analyzed by quantitative real-time PCR. Evidence was found for an inflammatory response elicited by the cyclophane exposures. After 8 h of exposure, the cells increased the relative expression of inflammatory mediators such as interleukin 1; IRAK, which transduces signals between interleukin 1 receptors and the NFκB pathway; and the LPS pattern recognition receptor CD14. After 24 h of exposure, regulatory genes begin to counter the inflammation, as some genes involved in oxidative stress, apoptosis and non-inflammatory immune responses come into play. Both Fe2PO and Fe2PC induced similar immunogenetic changes in transcription profiles, but equal molar doses of Fe2PC resulted in more robust responses. These data suggest that further work in whole animal models may provide more insights into the extent of systemic physiological changes induced by these cyclophanes.
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Affiliation(s)
- Alex J Salazar-Medina
- Cátedra CONACYT-Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Hermosillo, Sonora, Mexico
| | - Enrique F Velazquez-Contreras
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Hermosillo, Sonora, Mexico.,Departamento de Ciencias Químico Biológicas, Universidad de Sonora, Hermosillo, Sonora, Mexico
| | - Rocio Sugich-Miranda
- Departamento de Ciencias Químico Biológicas, Universidad de Sonora, Hermosillo, Sonora, Mexico
| | - Hisila Santacruz
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Hermosillo, Sonora, Mexico
| | - Rosa E Navarro
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Hermosillo, Sonora, Mexico
| | - Fernando Rocha-Alonzo
- Departamento de Ciencias Químico Biológicas, Universidad de Sonora, Hermosillo, Sonora, Mexico
| | - Maria A Islas-Osuna
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Hermosillo, Sonora, Mexico.,Centro de Investigación en Alimentación y Desarrollo, A.C., Hermosillo, Sonora, Mexico
| | - Patricia L Chen
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, USA
| | - Sarah G B Christian
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, USA
| | - Amelia A Romoser
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, USA
| | - Scott V Dindot
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, USA
| | - Christie M Sayes
- Nanotoxicology and Nanopharmacology, RTI International, Research Triangle, MC, USA
| | - Rogerio R Sotelo-Mundo
- Biomolecular Structure Laboratory, Centro de Investigación en Alimentación y Desarrollo, A.C., Hermosillo, Sonora, Mexico
| | - Michael F Criscitiello
- Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, USA
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9
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Zeng L, Yang X, Zhou J. The xanthophyll cycle as an early pathogenic target to deregulate guard cells during Sclerotinia sclerotiorum infection. PLANT SIGNALING & BEHAVIOR 2020; 15:1691704. [PMID: 31724459 PMCID: PMC7012177 DOI: 10.1080/15592324.2019.1691704] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Stomata not only control the important balance between gaseous fluxes and water loss, but also act as a route of invading pathogen entry into the plant. Here, the stomatal opening was observed to be induced by a necrotrophic pathogen Sclerotinia sclerotiorum at the early stages of infection. In contrast to uninfected control, the stomatal pores were still opened in S. sclerotiorum-infected regions after dark adaption. Mutation of violaxanthin de-epoxidase, a key enzyme in the xanthophyll cycle, could partially restore the S. sclerotiorum-induced stomatal opening. Further studies showed that S. sclerotiorum invasion led to a decrease in electron transport rate, but a significant increase in non-photochemical quenching (NPQ). The decay kinetics of NPQ revealed that zeaxanthin epoxidase (ZEP, also known as ABA1) was continuous deactivation in S. sclerotiorum-infected region. HPLC-MS/MS analysis showed a slight increase of jasmonate acid (JA), but a great decrease of abscisic acid (ABA) content in S. sclerotiorum-inoculated tissue. Exogenous application of ABA but not JA could rescue the abnormal stomatal opening. Together, these results suggested that the S. sclerotiorum-induced decrease of ABA biosynthesis reduced stomatal closing via dysfunction of the xanthophyll cycle during early pathogenesis.
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Affiliation(s)
- Lizhang Zeng
- Institute for Brain Research and Rehabilitation, South China Normal University, Guangzhou, China
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
| | - Xiangbo Yang
- School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, China
- Xiangbo Yang School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510631, China
| | - Jun Zhou
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
- CONTACT Jun Zhou MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China
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Pandaranayaka EP, Frenkel O, Elad Y, Prusky D, Harel A. Network analysis exposes core functions in major lifestyles of fungal and oomycete plant pathogens. BMC Genomics 2019; 20:1020. [PMID: 31878885 PMCID: PMC6933724 DOI: 10.1186/s12864-019-6409-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 12/17/2019] [Indexed: 12/12/2022] Open
Abstract
Background Genomic studies demonstrate that components of virulence mechanisms in filamentous eukaryotic pathogens (FEPs, fungi and oomycetes) of plants are often highly conserved, or found in gene families that include secreted hydrolytic enzymes (e.g., cellulases and proteases) and secondary metabolites (e.g., toxins), central to the pathogenicity process. However, very few large-scale genomic comparisons have utilized complete proteomes from dozens of FEPs to reveal lifestyle-associated virulence mechanisms. Providing a powerful means for exploration, and the discovery of trends in large-scale datasets, network analysis has been used to identify core functions of the primordial cyanobacteria, and ancient evolutionary signatures in oxidoreductases. Results We used a sequence-similarity network to study components of virulence mechanisms of major pathogenic lifestyles (necrotroph (ic), N; biotroph (ic), B; hemibiotroph (ic), H) in complete pan-proteomes of 65 FEPs and 17 saprobes. Our comparative analysis highlights approximately 190 core functions found in 70% of the genomes of these pathogenic lifestyles. Core functions were found mainly in: transport (in H, N, B cores); carbohydrate metabolism, secondary metabolite synthesis, and protease (H and N cores); nucleic acid metabolism and signal transduction (B core); and amino acid metabolism (H core). Taken together, the necrotrophic core contains functions such as cell wall-associated degrading enzymes, toxin metabolism, and transport, which are likely to support their lifestyle of killing prior to feeding. The biotrophic stealth growth on living tissues is potentially controlled by a core of regulatory functions, such as: small G-protein family of GTPases, RNA modification, and cryptochrome-based light sensing. Regulatory mechanisms found in the hemibiotrophic core contain light- and CO2-sensing functions that could mediate important roles of this group, such as transition between lifestyles. Conclusions The selected set of enriched core functions identified in our work can facilitate future studies aimed at controlling FEPs. One interesting example would be to facilitate the identification of the pathogenic potential of samples analyzed by metagenomics. Finally, our analysis offers potential evolutionary scenarios, suggesting that an early-branching saprobe (identified in previous studies) has probably evolved a necrotrophic lifestyle as illustrated by the highest number of shared gene families between saprobes and necrotrophs.
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Affiliation(s)
- Eswari Pj Pandaranayaka
- Department of Vegetable and Field Crops, Institute of Plant Sciences, Volcani Center, Agricultural Research Organization, Rishon LeZion, Israel
| | - Omer Frenkel
- Department of Plant Pathology and Weed Research, Institute of Plant Protection, Volcani Center, Agricultural Research Organization, Rishon LeZion, Israel
| | - Yigal Elad
- Department of Plant Pathology and Weed Research, Institute of Plant Protection, Volcani Center, Agricultural Research Organization, Rishon LeZion, Israel
| | - Dov Prusky
- Department of Postharvest Science, Institute of Postharvest and Food Sciences, Volcani Center, Agricultural Research Organization, Rishon LeZion, Israel
| | - Arye Harel
- Department of Vegetable and Field Crops, Institute of Plant Sciences, Volcani Center, Agricultural Research Organization, Rishon LeZion, Israel.
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11
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Liang X, Rollins JA. Mechanisms of Broad Host Range Necrotrophic Pathogenesis in Sclerotinia sclerotiorum. PHYTOPATHOLOGY 2018; 108:1128-1140. [PMID: 30048598 DOI: 10.1094/phyto-06-18-0197-rvw] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Among necrotrophic fungi, Sclerotinia sclerotiorum is remarkable for its extremely broad host range and for its aggressive host tissue colonization. With full genome sequencing, transcriptomic analyses and the increasing pace of functional gene characterization, the factors underlying the basis of this broad host range necrotrophic pathogenesis are now being elucidated at a greater pace. Among these, genes have been characterized that are required for infection via compound appressoria in addition to genes associated with colonization that regulate oxalic acid (OA) production and OA catabolism. Moreover, virulence-related secretory proteins have been identified, among which are candidates for manipulating host activities apoplastically and cytoplasmically. Coupled with these mechanistic studies, cytological observations of the colonization process have blurred the heretofore clear-cut biotroph versus necrotroph boundary. In this review, we reexamine the cytology of S. sclerotiorum infection and put more recent molecular and genomic data into the context of this cytology. We propose a two-phase infection model in which the pathogen first evades, counteracts and subverts host basal defense reactions prior to killing and degrading host cells. Spatially, the pathogen may achieve this via the production of compatibility factors/effectors in compound appressoria, bulbous subcuticular hyphae, and primary invasive hyphae. By examining the nuances of this interaction, we hope to illuminate new classes of factors as targets to improve our understanding of broad host range necrotrophic pathogens and provide the basis for understanding corresponding host resistance.
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Affiliation(s)
- Xiaofei Liang
- First author: State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University; and second author: Department of Plant Pathology, University of Florida, P.O. Box 110680, Gainesville 32611-0680
| | - Jeffrey A Rollins
- First author: State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University; and second author: Department of Plant Pathology, University of Florida, P.O. Box 110680, Gainesville 32611-0680
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12
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Xu L, Li G, Jiang D, Chen W. Sclerotinia sclerotiorum: An Evaluation of Virulence Theories. ANNUAL REVIEW OF PHYTOPATHOLOGY 2018; 56:311-338. [PMID: 29958073 DOI: 10.1146/annurev-phyto-080417-050052] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Oxalic acid production in Sclerotinia sclerotiorum has long been associated with virulence. Research involving UV-induced, genetically undefined mutants that concomitantly lost oxalate accumulation, sclerotial formation, and pathogenicity supported the conclusion that oxalate is an essential pathogenicity determinant of S. sclerotiorum. However, recent investigations showed that genetically defined mutants that lost oxalic acid production but accumulated fumaric acid could cause disease on many plants and substantiated the conclusion that acidic pH, not oxalic acid per se, is the necessary condition for disease development. Critical evaluation of available evidence showed that the UV-induced mutants harbored previously unrecognized confounding genetic defects in saprophytic growth and pH responsiveness, warranting reevaluation of the conclusions about virulence based on the UV-induced mutants. Furthermore, analyses of the evidence suggested a hypothesis for the existence of an unrecognized regulator responsive to acidic pH. Identifying the unknown pH regulator would offer a new avenue for investigating pH sensing/regulation in S. sclerotiorum and novel targets for intervention in disease control strategies.
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Affiliation(s)
- Liangsheng Xu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, People's Republic of China
| | - Guoqing Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
- The Provincial Key Lab of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Daohong Jiang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
- The Provincial Key Lab of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Weidong Chen
- Grain Legume Genetics and Physiology Research Unit, US Department of Agriculture, Agricultural Research Service, Washington State University, Pullman, Washington 99164, USA
- Departments of Plant Pathology and Molecular Plant Sciences Program, Washington State University, Pullman, Washington 99164, USA;
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13
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Fu MS, Coelho C, De Leon-Rodriguez CM, Rossi DCP, Camacho E, Jung EH, Kulkarni M, Casadevall A. Cryptococcus neoformans urease affects the outcome of intracellular pathogenesis by modulating phagolysosomal pH. PLoS Pathog 2018; 14:e1007144. [PMID: 29906292 PMCID: PMC6021110 DOI: 10.1371/journal.ppat.1007144] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 06/27/2018] [Accepted: 06/05/2018] [Indexed: 01/22/2023] Open
Abstract
Cryptococcus neoformans is a facultative intracellular pathogen and its interaction with macrophages is a key event determining the outcome of infection. Urease is a major virulence factor in C. neoformans but its role during macrophage interaction has not been characterized. Consequently, we analyzed the effect of urease on fungal-macrophage interaction using wild-type, urease-deficient and urease-complemented strains of C. neoformans. The frequency of non-lytic exocytosis events was reduced in the absence of urease. Urease-positive C. neoformans manifested reduced and delayed intracellular replication with fewer macrophages displaying phagolysosomal membrane permeabilization. The production of urease was associated with increased phagolysosomal pH, which in turn reduced growth of urease-positive C. neoformans inside macrophages. Interestingly, the ure1 mutant strain grew slower in fungal growth medium which was buffered to neutral pH (pH 7.4). Mice inoculated with macrophages carrying urease-deficient C. neoformans had lower fungal burden in the brain than mice infected with macrophages carrying wild-type strain. In contrast, the absence of urease did not affect survival of yeast when interacting with amoebae. Because of the inability of the urease deletion mutant to grow on urea as a sole nitrogen source, we hypothesize urease plays a nutritional role involved in nitrogen acquisition in the environment. Taken together, our data demonstrate that urease affects fitness within the mammalian phagosome, promoting non-lytic exocytosis while delaying intracellular replication and thus reducing phagolysosomal membrane damage, events that could facilitate cryptococcal dissemination when transported inside macrophages. This system provides an example where an enzyme involved in nutrient acquisition modulates virulence during mammalian infection.
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Affiliation(s)
- Man Shun Fu
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Carolina Coelho
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Carlos M. De Leon-Rodriguez
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, United States of America
| | - Diego C. P. Rossi
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Emma Camacho
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Eric H. Jung
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, United States of America
| | - Madhura Kulkarni
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Arturo Casadevall
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, United States of America
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14
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Tracing the pH dependent activation of autophagy in cancer cells by silicon nanowire-based impedance biosensor. J Pharm Biomed Anal 2018; 154:158-165. [PMID: 29549854 DOI: 10.1016/j.jpba.2018.02.040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 02/12/2018] [Accepted: 02/20/2018] [Indexed: 12/16/2022]
Abstract
Monitoring the pH dependent behavior of normal and cancer cells by impedimetric biosensor based on Silicon Nanowires (SiNWs) was introduced to diagnose the invasive cancer cells. Autophagy as a biologically activated process in invasive cancer cells during acidosis, protect them from apoptosis in lower pH which presented in our work. As the autophagy is the only activated pathways which can maintain cellular proliferation in acidic media, responses of SiNW-ECIS in acidified cells could be correlated to the probability of autophagy activation in normal or cancer cells. In contrast, cell survival pathway wasn't activated in low-grade cancer cells which resulted in their acidosis. The measured electrical resistance of MCF10, MCF7, and MDA-MB468 cell lines, by SiNW sensor, in normal and acidic media were matched by the biological analyses of their vital functions. Invasive cancer cells exhibited increased electrical resistance in pH 6.5 meanwhile the two other types of the breast cells exhibited sharp (MCF10) and moderate (MCF7) decrease in their resistance. This procedure would be a new trend in microenvironment based cancer investigation.
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15
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Abstract
Intracellular bacterial pathogens have evolved to exploit the protected niche provided within the boundaries of a eukaryotic host cell. Upon entering a host cell, some bacteria can evade the adaptive immune response of its host and replicate in a relatively nutrient-rich environment devoid of competition from other host flora. Growth within a host cell is not without their hazards, however. Many pathogens enter their hosts through receptor-mediated endocytosis or phagocytosis, two intracellular trafficking pathways that terminate in a highly degradative organelle, the phagolysosome. This usually deadly compartment is maintained at a low pH and contains degradative enzymes and reactive oxygen species, resulting in an environment to which few bacterial species are adapted. Some intracellular pathogens, such as Shigella, Listeria, Francisella, and Rickettsia, escape the phagosome to replicate within the cytosol of the host cell. Bacteria that remain within a vacuole either alter the trafficking of their initial phagosomal compartment or adapt to survive within the harsh environment it will soon become. In this chapter, we focus on the mechanisms by which different vacuolar pathogens either evade lysosomal fusion, as in the case of Mycobacterium and Chlamydia, or allow interaction with lysosomes to varying degrees, such as Brucella and Coxiella, and their specific adaptations to inhabit a replicative niche.
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16
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Zhong J, Chen D, Zhu HJ, Gao BD, Zhou Q. Hypovirulence of Sclerotium rolfsii Caused by Associated RNA Mycovirus. Front Microbiol 2016; 7:1798. [PMID: 27891121 PMCID: PMC5103162 DOI: 10.3389/fmicb.2016.01798] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 10/26/2016] [Indexed: 11/21/2022] Open
Abstract
Mycoviruses associated with hypovirulence are potential biological control agents and could be useful to study the pathogenesis of fungal host pathogens. Sclerotium rolfsii, a pathogenic fungus, causes southern blight in a wide variety of crops. In this study, we isolated a series of dsRNAs from a debilitated S. rolfsii strain, BLH-1, which had pronounced phenotypic aberrations including reduced pathogenicity, mycelial growth and deficient sclerotia production. Virus-curing and horizontal transmission experiments that eliminated or transmitted, respectively, all dsRNA elements showed that the dsRNAs were involved in the hypovirulent traits of BLH-1. Ultrastructure examination also showed hyphae fracture and cytoplasm or organelle degeneration in BLH-1 hyphal cells compared to the virus-free strain. Three assembled cDNA contigs generated from the cDNA library cloned from the purified dsRNA indicated that strain BLH-1 was infected by at least three novel mycoviruses. One has similarity to the hypovirulence-associated Sclerotinia sclerotiorum hypovirus 2 (SsHV2) in the family Hypoviridae, and the other two are related to two different unclassified dsRNA mycovirus families. To our knowledge, this is the first report of S. rolfsii hypovirulence that was correlated with its associated dsRNA.
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Affiliation(s)
- Jie Zhong
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University Changsha, China
| | - Dan Chen
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University Changsha, China
| | - Hong J Zhu
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University Changsha, China
| | - Bi D Gao
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University Changsha, China
| | - Qian Zhou
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University Changsha, China
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Pandey A, Cabello A, Akoolo L, Rice-Ficht A, Arenas-Gamboa A, McMurray D, Ficht TA, de Figueiredo P. The Case for Live Attenuated Vaccines against the Neglected Zoonotic Diseases Brucellosis and Bovine Tuberculosis. PLoS Negl Trop Dis 2016; 10:e0004572. [PMID: 27537413 PMCID: PMC4990199 DOI: 10.1371/journal.pntd.0004572] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Vaccination of humans and animals with live attenuated organisms has proven to be an effective means of combatting some important infectious diseases. In fact, the 20th century witnessed tremendous improvements in human and animal health worldwide as a consequence of large-scale vaccination programs with live attenuated vaccines (LAVs). Here, we use the neglected zoonotic diseases brucellosis and bovine tuberculosis (BTb) caused by Brucella spp. and Mycobacterium bovis (M. bovis), respectively, as comparative models to outline the merits of LAV platforms with emphasis on molecular strategies that have been pursued to generate LAVs with enhanced vaccine safety and efficacy profiles. Finally, we discuss the prospects of LAV platforms in the fight against brucellosis and BTb and outline new avenues for future research towards developing effective vaccines using LAV platforms.
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Affiliation(s)
- Aseem Pandey
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, Texas, United States of America
- Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas, United States of America
- Norman Borlaug Center, Texas A&M University, College Station, Texas, United States of America
- * E-mail: (AP); (PdF)
| | - Ana Cabello
- Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas, United States of America
| | - Lavoisier Akoolo
- Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas, United States of America
| | - Allison Rice-Ficht
- Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas, United States of America
- Department of Molecular and Cellular Medicine, Texas A&M Health Science Center, Bryan, Texas, United States of America
| | - Angela Arenas-Gamboa
- Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas, United States of America
| | - David McMurray
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, Texas, United States of America
| | - Thomas A. Ficht
- Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas, United States of America
| | - Paul de Figueiredo
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, Texas, United States of America
- Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas, United States of America
- Norman Borlaug Center, Texas A&M University, College Station, Texas, United States of America
- * E-mail: (AP); (PdF)
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18
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Cao JY, Xu YP, Cai XZ. TMT-based quantitative proteomics analyses reveal novel defense mechanisms of Brassica napus against the devastating necrotrophic pathogen Sclerotinia sclerotiorum. J Proteomics 2016; 143:265-277. [PMID: 26947552 DOI: 10.1016/j.jprot.2016.03.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Revised: 02/24/2016] [Accepted: 03/02/2016] [Indexed: 12/31/2022]
Abstract
UNLABELLED The white mould disease, caused by Sclerotinia sclerotiorum, is one of the most important diseases in the vital oil crop Brassica napus. Nevertheless, the defense mechanisms of B. napus against S. sclerotiorum are poorly understood. In this study, we performed comparative quantitative proteomics analyses to reveal B. napus defense mechanisms against S. sclerotiorum. The proteomes of B. napus leaves inoculated with S. sclerotiorum wild-type strain 1980 and nonpathogenic mutant strain Ep-1PB as well as empty agar plug as the control were analyzed using TMT label-based quantitative analysis technique. A total of 79, 299 and 173 proteins consistently differentially expressed between Ep-1PB- and mock-inoculated leaves, 1980- and mock-inoculated leaves, as well as 1980- and Ep-1PB-inoculated leaves, respectively, were identified. The differential expression of 12 selected proteins was confirmed by qRT-PCR analyses. The Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG) and protein-protein interaction prediction analyses revealed that redox homeostasis, lipid signaling, calcium signaling, histone and DNA methylation-mediated transcription regulation and defense-related proteins such as defensin and defensin-like proteins and cyanate lyase, contribute to defense against S. sclerotiorum. Our results provide new insights into molecular mechanisms that may be involved in defense responses of B. napus to S. sclerotiorum. SIGNIFICANCE The Sclerotinia white mould disease is one of the most important diseases in the significant oil crop Brassica napus. Nevertheless, the defense mechanisms of B. napus against S. sclerotiorum are still largely unknown to date. In this study, we addressed this issue by performing TMT label-based comparative quantitative analyses of the proteomes of B. napus leaves inoculated with S. sclerotiorum wild-type strain 1980 and nonpathogenic mutant strain Ep-1PB as well as empty agar plug as the control. Through comparative analyses on 79, 299, and 173 proteins that are consistently differentially expressed in between Ep-1PB-inoculated and the control leaves, 1980-inoculated and the control leaves, as well as 1980-inoculated and Ep-1PB-inoculated leaves, respectively, we revealed that redox homeostasis, lipid signaling, calcium signaling, histone and DNA methylation-mediated transcription regulation and defense-related proteins such as defensin and defensin-like proteins as well as cyanate lyase, contribute to B. napus defenses against S. sclerotiorum. Notably, the potential role of lipid signaling, calcium signaling, histone and DNA methylation-mediated transcription regulation and cyanate lyase in B. napus defense against S. sclerotiorum are not reported previously but rather unveiled for the first time in this study. The current study represents the most extensive analysis of the protein profile of B. napus in response to S. sclerotiorum inoculation and includes for the first time the results from comparison between plants inoculated with the wild-type strain and a nonpathogenic mutant strain of S. sclerotiorum. Collectively, our results provide new insights into the molecular mechanisms of interactions between B. napus and S. sclerotiorum.
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Affiliation(s)
- Jia-Yi Cao
- Institute of Biotechnology, College of Agriculture and Biotechnology, Zhejiang University, 866 Yu Hang Tang Road, Hangzhou 310058, China
| | - You-Ping Xu
- Centre of Analysis and Measurement, Zhejiang University, 866 Yu Hang Tang Road, Hangzhou 310058, China
| | - Xin-Zhong Cai
- Institute of Biotechnology, College of Agriculture and Biotechnology, Zhejiang University, 866 Yu Hang Tang Road, Hangzhou 310058, China.
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19
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DeLeon-Rodriguez CM, Casadevall A. Cryptococcus neoformans: Tripping on Acid in the Phagolysosome. Front Microbiol 2016; 7:164. [PMID: 26925039 PMCID: PMC4756110 DOI: 10.3389/fmicb.2016.00164] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 02/01/2016] [Indexed: 01/10/2023] Open
Abstract
Cryptococcus neoformans (Cn) is a basidiomycetous pathogenic yeast that is a frequent cause of meningoencephalitis in immunocompromised individuals. Cn is a facultative intracellular pathogen in mammals, insects and amoeba. Cn infection occurs after inhalation of spores or desiccated cells from the environment. After inhalation Cn localizes to the lungs where it can be phagocytosed by alveolar macrophages. Cn is surrounded by a polysaccharide capsule that helps the fungus survive in vivo by interfering with phagocytosis, quenching free radical bursts and shedding polysaccharides that negatively modulates the immune system. After phagocytosis, Cn resides within the phagosome that matures to become a phagolysosome, a process that results in the acidification of the phagolysosomal lumen. Cn replicates at a higher rate inside macrophages than in the extracellular environment, possibly as a result that the phagosomal pH is near that optimal for growth. Cn increases the phagolysosomal pH and modulates the dynamics of Rab GTPases interaction with the phagolysosome. Chemical manipulation of the phagolysosomal pH with drugs can result in direct and indirect killing of Cn and reduced non-lytic exocytosis. Phagolysosomal membrane damage after Cn infection occurs both in vivo and in vitro, and is required for Cn growth and survival. Macrophage treatment with IFN-γ reduces the phagolysosomal damage and increases intracellular killing of Cn. Studies on mice and humans show that treatment with IFN-γ can improve host control of the disease. However, the mechanism by which Cn mediates phagolysosomal membrane damage remains unknown but likely candidates are phospholipases and mechanical damage from an enlarging capsule. Here we review Cn intracellular interaction with a particular emphasis on phagosomal interactions and develop the notion that the extent of damage of the phagosomal membrane is a key determinant of the outcome of the Cn-macrophage interaction.
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Affiliation(s)
| | - Arturo Casadevall
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, BronxNY, USA; Department of Molecular Microbiology and Immunology, Johns Hopkins University School of Public Health, BaltimoreMD, USA
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20
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Singh A, Barnard TG. Surviving the acid barrier: responses of pathogenic Vibrio cholerae to simulated gastric fluid. Appl Microbiol Biotechnol 2015; 100:815-24. [PMID: 26496916 DOI: 10.1007/s00253-015-7067-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 09/30/2015] [Accepted: 10/06/2015] [Indexed: 11/30/2022]
Abstract
When bacteria are subjected to low acidic pHs of the gastric environment, they may enter the viable but nonculturable (VBNC) state of survival. In this state, bacteria cannot be cultured on solid media, still exhibit signs of metabolic activity (viability). In this study, the response of pathogenic Vibrio cholerae O1 and O139 to low pH-simulated environments of the human stomach was evaluated for their survival by culturability (plate count) and viability (flow cytometry-FC) assays. Bacteria were acid challenged with simulated gastric fluid (SGF) at pH 1.5, 2.5, 3.5 and 4.5 over a period of 180 min. Exposure to SGF up to 120 min increased acid tolerance of the Vibrios up to pH 3.5 with acid challenge occurring at pH 4.5. Bacteria were culturable from pH 2.5 to 4.5 up to 60 min SGF exposure. The stationary-phase cultures of Vibrio were able to survive SGF at all pHs in an 'injured' state with FC. This could possibly mean that the bacteria have entered the VBNC stage of survival. This is a worrying public health concern due to the fact that once favourable conditions arise (intestines), these Vibrios can change back to an infectious state and cause disease.
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Affiliation(s)
- Atheesha Singh
- Water and Health Research Centre, University of Johannesburg, PO Box 17011, Doornfontein, 2028, Johannesburg, South Africa.
| | - Tobias G Barnard
- Water and Health Research Centre, University of Johannesburg, PO Box 17011, Doornfontein, 2028, Johannesburg, South Africa
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Zhou J, Zeng L, Liu J, Xing D. Manipulation of the Xanthophyll Cycle Increases Plant Susceptibility to Sclerotinia sclerotiorum. PLoS Pathog 2015; 11:e1004878. [PMID: 25993128 PMCID: PMC4439079 DOI: 10.1371/journal.ppat.1004878] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 04/13/2015] [Indexed: 11/19/2022] Open
Abstract
The xanthophyll cycle is involved in dissipating excess light energy to protect the photosynthetic apparatus in a process commonly assessed from non-photochemical quenching (NPQ) of chlorophyll fluorescence. Here, it is shown that the xanthophyll cycle is modulated by the necrotrophic pathogen Sclerotinia sclerotiorum at the early stage of infection. Incubation of Sclerotinia led to a localized increase in NPQ even at low light intensity. Further studies showed that this abnormal change in NPQ was closely correlated with a decreased pH caused by Sclerotinia-secreted oxalate, which might decrease the ATP synthase activity and lead to a deepening of thylakoid lumen acidification under continuous illumination. Furthermore, suppression (with dithiothreitol) or a defect (in the npq1-2 mutant) of violaxanthin de-epoxidase (VDE) abolished the Sclerotinia-induced NPQ increase. HPLC analysis showed that the Sclerotinia-inoculated tissue accumulated substantial quantities of zeaxanthin at the expense of violaxanthin, with a corresponding decrease in neoxanthin content. Immunoassays revealed that the decrease in these xanthophyll precursors reduced de novo abscisic acid (ABA) biosynthesis and apparently weakened tissue defense responses, including ROS induction and callose deposition, resulting in enhanced plant susceptibility to Sclerotinia. We thus propose that Sclerotinia antagonizes ABA biosynthesis to suppress host defense by manipulating the xanthophyll cycle in early pathogenesis. These findings provide a model of how photoprotective metabolites integrate into the defense responses, and expand the current knowledge of early plant-Sclerotinia interactions at infection sites.
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Affiliation(s)
- Jun Zhou
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
| | - Lizhang Zeng
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
| | - Jian Liu
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
| | - Da Xing
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
- * E-mail: ,
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22
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Xu L, Xiang M, White D, Chen W. pH dependency of sclerotial development and pathogenicity revealed by using genetically defined oxalate-minus mutants of Sclerotinia sclerotiorum. Environ Microbiol 2015; 17:2896-909. [PMID: 25720941 DOI: 10.1111/1462-2920.12818] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 02/03/2015] [Accepted: 02/13/2015] [Indexed: 12/25/2022]
Abstract
The devastating plant pathogen Sclerotinia sclerotiorum produces copious (up to 50 mM) amounts of oxalic acid, which, for over a quarter century, has been claimed as the pathogenicity determinant based on UV-induced mutants that concomitantly lost oxalate production and pathogenicity. Such a claim was made without fulfilling the molecular Koch's postulates because the UV mutants are genetically undefined and harbour a developmental defect in sclerotial production. Here, we generated oxalate-minus mutants of S. sclerotiorum using two independent mutagenesis techniques, and tested the resulting mutants for growth at different pHs and for pathogenicity on four host plants. The oxalate-minus mutants accumulated fumaric acid, produced functional sclerotia and have reduced ability to acidify the environment. The oxalate-minus mutants retained pathogenicity on plants, but their virulence varied depending on the pH and buffering capacity of host tissue. Acidifying the host tissue enhanced virulence of the oxalate-minus mutants, whereas supplementing with oxalate did not. These results suggest that it is low pH, not oxalic acid itself, that establishes the optimum conditions for growth, reproduction, pathogenicity and virulence expression of S. sclerotiorum. Exonerating oxalic acid as the primary pathogenicity determinant will stimulate research into identifying additional candidates as pathogenicity factors towards better understanding and managing Sclerotinia diseases.
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Affiliation(s)
- Liangsheng Xu
- Department of Plant Pathology, Washington State University, Pullman, WA, 99164, USA
| | - Meichun Xiang
- Department of Plant Pathology, Washington State University, Pullman, WA, 99164, USA
| | - David White
- Department of Plant Pathology, Washington State University, Pullman, WA, 99164, USA
| | - Weidong Chen
- Department of Plant Pathology, Washington State University, Pullman, WA, 99164, USA.,USDA-ARS, Grain Legume Genetics and Physiology Research Unit, Washington State University, Pullman, WA, 99164, USA
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Sun L, Liu X, Gao L, Lu Y, Li Y, Pan Z, Bao N, Gu H. Simultaneous Electrochemical Determination of Indole-3-acetic Acid and Salicylic Acid in Pea Roots using a Multiwalled Carbon Nanotube Modified Electrode. ANAL LETT 2015. [DOI: 10.1080/00032719.2014.991963] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Criscitiello MF. What the shark immune system can and cannot provide for the expanding design landscape of immunotherapy. Expert Opin Drug Discov 2014; 9:725-39. [PMID: 24836096 DOI: 10.1517/17460441.2014.920818] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
INTRODUCTION Sharks have successfully lived in marine ecosystems, often atop food chains as apex predators, for nearly one and a half billion years. Throughout this period they have benefitted from an immune system with the same fundamental components found in terrestrial vertebrates like man. Additionally, sharks have some rather extraordinary immune mechanisms which mammals lack. AREAS COVERED In this review the author briefly orients the reader to sharks, their adaptive immunity, and their important phylogenetic position in comparative immunology. The author also differentiates some of the myths from facts concerning these animals, their cartilage, and cancer. From thereon, the author explores some of the more remarkable capabilities and products of shark lymphocytes. Sharks have an isotype of light chain-less antibodies that are useful tools in molecular biology and are moving towards translational use in the clinic. These special antibodies are just one of the several tricks of shark lymphocyte antigen receptor systems. EXPERT OPINION While shark cartilage has not helped oncology patients, shark immunoglobulins and T cell receptors do offer exciting novel possibilities for immunotherapeutics. Much of the clinical immunology developmental pipeline has turned from traditional vaccines to passively delivered monoclonal antibody-based drugs for targeted depletion, activation, blocking and immunomodulation. The immunogenetic tools of shark lymphocytes, battle-tested since the dawn of our adaptive immune system, are well poised to expand the design landscape for the next generation of immunotherapy products.
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Affiliation(s)
- Michael F Criscitiello
- Texas A&M University, College of Veterinary Medicine and Biomedical Sciences, Texas A&M Health Science Center, Comparative Immunogenetics Laboratory, Department of Veterinary Pathobiology , Mailstop 4467, College Station, TX 77843 , USA +1 979 845 4207 ; +1 979 862 1088 ;
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Kost T, Stopnisek N, Agnoli K, Eberl L, Weisskopf L. Oxalotrophy, a widespread trait of plant-associated Burkholderia species, is involved in successful root colonization of lupin and maize by Burkholderia phytofirmans. Front Microbiol 2014; 4:421. [PMID: 24409174 PMCID: PMC3886118 DOI: 10.3389/fmicb.2013.00421] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 12/23/2013] [Indexed: 01/24/2023] Open
Abstract
Plant roots and shoots harbor complex bacterial communities. Early seed and plantlet colonization plays a key role in determining which bacterial populations will successfully invade plant tissues, yet the mechanisms enabling plants to select for beneficial rather than harmful populations are largely unknown. In this study, we demonstrate a role of oxalate as a determinant in this selection process, using members of the genus Burkholderia as model organisms. Oxalotrophy, i.e., the ability to use oxalate as a carbon source, was found to be a property strictly associated with plant-beneficial species of the Burkholderia genus, while plant pathogenic (B. glumae, B. plantarii) or human opportunistic pathogens (Burkholderia cepacia complex strains) were unable to degrade oxalate. We further show that oxalotrophy is required for successful plant colonization by the broad host endophyte Burkholderia phytofirmans PsJN: an engineered Δoxc mutant, which lost the ability to grow on oxalate, was significantly impaired in early colonization of both lupin and maize compared with the wild-type. This work suggests that in addition to the role of oxalate in heavy metal tolerance of plants and in virulence of phytopathogenic fungi, it is also involved in specifically recruiting plant-beneficial members from complex bacterial communities.
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Affiliation(s)
- Thomas Kost
- Laboratory of Microbiology, Institute of Plant Biology, University of Zurich Zurich, Switzerland
| | - Nejc Stopnisek
- Laboratory of Microbiology, Institute of Plant Biology, University of Zurich Zurich, Switzerland ; Ecology of Noxious and Beneficial Organisms, Institute of Sustainability Sciences Agroscope, Zurich, Switzerland
| | - Kirsty Agnoli
- Laboratory of Microbiology, Institute of Plant Biology, University of Zurich Zurich, Switzerland
| | - Leo Eberl
- Laboratory of Microbiology, Institute of Plant Biology, University of Zurich Zurich, Switzerland
| | - Laure Weisskopf
- Laboratory of Microbiology, Institute of Plant Biology, University of Zurich Zurich, Switzerland ; Ecology of Noxious and Beneficial Organisms, Institute of Sustainability Sciences Agroscope, Zurich, Switzerland
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