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Miao Z, Xiong C, Wang Y, Shan T, Jiang H. Identification of immunity-related genes distinctly regulated by Manduca sexta Spӓtzle-1/2 and Escherichia coli peptidoglycan. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2024; 168:104108. [PMID: 38552808 PMCID: PMC11443596 DOI: 10.1016/j.ibmb.2024.104108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 03/03/2024] [Accepted: 03/14/2024] [Indexed: 04/08/2024]
Abstract
The immune system of Manduca sexta has been well studied to understand molecular mechanisms of insect antimicrobial responses. While evidence supports the existence of major immune signaling pathways in this species, it is unclear how induced production of defense proteins is specifically regulated by the Toll and Imd pathways. Our previous studies suggested that diaminopimelic acid-type peptidoglycans (DAP-PG) from Gram-negative and some Gram-positive bacteria, more than Lys-type peptidoglycans (Lys-PG) from other Gram-positive bacteria, triggers both pathways through membrane-bound receptors orthologous to Drosophila Toll and PGRP-LC. In this study, we produced M. sexta proSpätzle-1 and proSpätzle-2 in Sf9 cells, identified their processing enzymes, and used prophenoloxidase activating protease-3 to activate the cytokine precursors. After Spätzle-1 and -2 were isolated from the reaction mixtures, we separately injected the purified cytokines into larval hemocoel to induce gene transcription in fat body through the Toll pathway solely. On the other hand, we treated a M. sexta cell line with E. coli DAP-PG to only induce the Imd pathway and target gene expression. RNA-Seq analysis of the fat body and cultured cells collected at 0, 6, and 24 h after treatment indicated that expression of diapausin-4, -10, -12, -13, cecropin-2, -4, -5, attacin-5, -11, and lebocin D is up-regulated predominantly via Toll signaling, whereas transcription of cecropin-6, gloverin, lysozyme-1, and gallerimycin-2 is mostly induced by DAP-PG via Imd signaling. Other antimicrobial peptides are expressed in response to both pathways. Transcripts of most Toll-specific genes (e.g., lebocin D) peaked at 6 h, contrasting the gradual increase and plateauing of drosomycin mRNA level at 24-48 h in Drosophila. We also used T (oll)-I (md) ratios to estimate relative contributions of the two pathways to transcriptional regulation of other components of the immune system. The differences in pathway specificity and time course of transcriptional regulation call for further investigations in M. sexta and other insects.
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Affiliation(s)
- Zelong Miao
- Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK, 74078, USA
| | - Chao Xiong
- Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK, 74078, USA
| | - Yang Wang
- Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK, 74078, USA
| | - Tisheng Shan
- Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK, 74078, USA
| | - Haobo Jiang
- Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK, 74078, USA.
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Lu M, Wei D, Shang J, Li S, Song S, Luo Y, Tang G, Wang C. Suppression of Drosophila antifungal immunity by a parasite effector via blocking GNBP3 and GNBP-like 3, the dual receptors for β-glucans. Cell Rep 2024; 43:113642. [PMID: 38175756 DOI: 10.1016/j.celrep.2023.113642] [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: 09/21/2023] [Revised: 11/14/2023] [Accepted: 12/18/2023] [Indexed: 01/06/2024] Open
Abstract
The tactics used by animal pathogens to combat host immunity are largely unclear. Here, we report the depiction of the virulence-required effector Tge1 deployed by the entomopathogen Metarhizium robertsii to suppress Drosophila antifungal immunity. Tge1 can target both GNBP3 and GNBP-like 3 (GL3), and the latter can bind to β-glucans like GNBP3, whereas the glucan binding by both receptors can be attenuated by Tge1. As opposed to the surveillance GNBP3, GL3 is inducible in Drosophila depending on the Toll pathway via a positive feedback loop mechanism. Losses of GNBP3 and GL3 genes result in the deregulations of protease cascade, Spätzle maturation, and antimicrobial gene expressions in Drosophila upon fungal challenges. Fly survival assays confirm that GL3 plays a more essential role than GNBP3 in combating fungal infections. In addition to evidencing the gene-for-gene interactions between fungi and insects, our data advance insights into Drosophila antifungal immunity.
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Affiliation(s)
- Mengting Lu
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Dongxiang Wei
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Junmei Shang
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Shiqin Li
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Shuangxiu Song
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Yujuan Luo
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Guirong Tang
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Chengshu Wang
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 100049, China; School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China.
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Xie X, Wang D, Li B, Liang G, Chen X, Xing D, Zhao T, Zhou X, Li C. Aedes aegypti Beta-1,3-Glucan-Binding Protein Inhibits Dengue and ZIKA Virus Replication. Biomedicines 2024; 12:88. [PMID: 38255195 PMCID: PMC10812959 DOI: 10.3390/biomedicines12010088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 12/14/2023] [Accepted: 12/25/2023] [Indexed: 01/24/2024] Open
Abstract
GNBPB6, a beta-1,3-glucan-binding protein, was identified in the transcriptome of Aedes aegypti (A. aegypti) with dengue (DENV), Zika (ZIKV), and chikungunya viruses (CHIKV). In this study, we not only clarified that DENV2 and ZIKV regulate the changes in GNBPB6 expression but also identified the relationship of this gene with viral infections. The changes in GNBPB6 expression were quantified and showed a decrease in A. aegypti cells (Aag2 cells) at 2 dpi and 3 dpi and an increase at 4 dpi and 5 dpi (p < 0.05). A significant increase was observed only at 5 dpi after DENV2 infection. Subsequently, a GNBPB6 knockout (KO) cell line was constructed using the CRISPR/Cas9 system, and the DENV2 and ZIKV RNA copies, along with cell densities, were quantified and compared between the KO and wild type (WT) cells at different dpi. The result showed that DENV2 and ZIKV RNA copies were significantly increased in the KO cell line with no significant change in cell growth. Finally, DENV2 copies decreased after GNBPB6 was complemented in the KO. In conclusion, GNBPB6 knockout and complementation in Aag2 cells revealed that GNBPB6 can inhibit the replication of both DENV2 and ZIKV. These results contribute to subsequent research on mosquito-virus interactions.
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Affiliation(s)
- Xiaoxue Xie
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; (X.X.); (D.W.); (B.L.); (G.L.); (X.C.); (D.X.); (T.Z.)
| | - Di Wang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; (X.X.); (D.W.); (B.L.); (G.L.); (X.C.); (D.X.); (T.Z.)
| | - Bo Li
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; (X.X.); (D.W.); (B.L.); (G.L.); (X.C.); (D.X.); (T.Z.)
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, China
| | - Guorui Liang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; (X.X.); (D.W.); (B.L.); (G.L.); (X.C.); (D.X.); (T.Z.)
| | - Xiaoli Chen
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; (X.X.); (D.W.); (B.L.); (G.L.); (X.C.); (D.X.); (T.Z.)
| | - Dan Xing
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; (X.X.); (D.W.); (B.L.); (G.L.); (X.C.); (D.X.); (T.Z.)
| | - Teng Zhao
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; (X.X.); (D.W.); (B.L.); (G.L.); (X.C.); (D.X.); (T.Z.)
| | - Xinyu Zhou
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; (X.X.); (D.W.); (B.L.); (G.L.); (X.C.); (D.X.); (T.Z.)
| | - Chunxiao Li
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; (X.X.); (D.W.); (B.L.); (G.L.); (X.C.); (D.X.); (T.Z.)
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Prince BC, Walsh E, Torres TZB, Rückert C. Recognition of Arboviruses by the Mosquito Immune System. Biomolecules 2023; 13:1159. [PMID: 37509194 PMCID: PMC10376960 DOI: 10.3390/biom13071159] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 07/12/2023] [Accepted: 07/18/2023] [Indexed: 07/30/2023] Open
Abstract
Arthropod-borne viruses (arboviruses) pose a significant threat to both human and animal health worldwide. These viruses are transmitted through the bites of mosquitoes, ticks, sandflies, or biting midges to humans or animals. In humans, arbovirus infection often results in mild flu-like symptoms, but severe disease and death also occur. There are few vaccines available, so control efforts focus on the mosquito population and virus transmission control. One area of research that may enable the development of new strategies to control arbovirus transmission is the field of vector immunology. Arthropod vectors, such as mosquitoes, have coevolved with arboviruses, resulting in a balance of virus replication and vector immune responses. If this balance were disrupted, virus transmission would likely be reduced, either through reduced replication, or even through enhanced replication, resulting in mosquito mortality. The first step in mounting any immune response is to recognize the presence of an invading pathogen. Recent research advances have been made to tease apart the mechanisms of arbovirus detection by mosquitoes. Here, we summarize what is known about arbovirus recognition by the mosquito immune system, try to generate a comprehensive picture, and highlight where there are still gaps in our current understanding.
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Affiliation(s)
- Brian C Prince
- Department of Biochemistry and Molecular Biology, College of Agriculture, Biotechnology & Natural Resources, University of Nevada, Reno, NV 89557, USA
| | - Elizabeth Walsh
- Department of Biochemistry and Molecular Biology, College of Agriculture, Biotechnology & Natural Resources, University of Nevada, Reno, NV 89557, USA
| | - Tran Zen B Torres
- Department of Biochemistry and Molecular Biology, College of Agriculture, Biotechnology & Natural Resources, University of Nevada, Reno, NV 89557, USA
| | - Claudia Rückert
- Department of Biochemistry and Molecular Biology, College of Agriculture, Biotechnology & Natural Resources, University of Nevada, Reno, NV 89557, USA
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Zhao L, Niu J, Feng D, Wang X, Zhang R. Immune functions of pattern recognition receptors in Lepidoptera. Front Immunol 2023; 14:1203061. [PMID: 37398667 PMCID: PMC10312389 DOI: 10.3389/fimmu.2023.1203061] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 06/05/2023] [Indexed: 07/04/2023] Open
Abstract
Pattern recognition receptors (PRRs), as the "sensors" in the immune response, play a prominent role in recognizing pathogen-associated molecular patterns (PAMPs) and initiating an effective defense response to pathogens in Lepidoptera. It is becoming increasingly clear that damage-associated molecular patterns (DAMPs) normally play a physiological role within cells; however, when exposed to extracellular, they may become "part-time" critical signals of the immune response. Based on research in recent years, we review herein typical PRRs of Lepidoptera, including peptidoglycan recognition protein (PGRP), gram-negative binding protein (GNBP), β-1,3-glucan recognition protein (βGRP), C-type lectin (CTL), and scavenger receptor (SR). We also outline the ways in which DAMPs participate in the immune response and the correlation between PRRs and immune escape. Taken together, these findings suggest that the role of PRRs in insect innate immunity may be much greater than expected and that it is possible to recognize a broader range of signaling molecules.
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Affiliation(s)
- Lin Zhao
- School of Life Science and Bio-Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, China
| | - Jinlan Niu
- School of Life Science and Bio-Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, China
| | - Disong Feng
- School of Life Science and Bio-Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, China
| | - Xialu Wang
- School of Medical Devices, Shenyang Pharmaceutical University, Shenyang, China
| | - Rong Zhang
- School of Life Science and Bio-Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, China
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Laureti M, Lee RX, Bennett A, Wilson LA, Sy VE, Kohl A, Dietrich I. Rift Valley Fever Virus Primes Immune Responses in Aedes aegypti Cells. Pathogens 2023; 12:563. [PMID: 37111448 PMCID: PMC10146816 DOI: 10.3390/pathogens12040563] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 03/25/2023] [Accepted: 04/03/2023] [Indexed: 04/29/2023] Open
Abstract
The ongoing global emergence of arthropod-borne (arbo) viruses has accelerated research into the interactions of these viruses with the immune systems of their vectors. Only limited information exists on how bunyaviruses, such as Rift Valley fever virus (RVFV), are sensed by mosquito immunity or escape detection. RVFV is a zoonotic phlebovirus (Bunyavirales; Phenuiviridae) of veterinary and human public health and economic importance. We have shown that the infection of mosquitoes with RVFV triggers the activation of RNA interference pathways, which moderately restrict viral replication. Here, we aimed to better understand the interactions between RVFV and other vector immune signaling pathways that might influence RVFV replication and transmission. For this, we used the immunocompetent Aedes aegypti Aag2 cell line as a model. We found that bacteria-induced immune responses restricted RVFV replication. However, virus infection alone did not alter the gene expression levels of immune effectors. Instead, it resulted in the marked enhancement of immune responses to subsequent bacterial stimulation. The gene expression levels of several mosquito immune pattern recognition receptors were altered by RVFV infection, which may contribute to this immune priming. Our findings imply that there is a complex interplay between RVFV and mosquito immunity that could be targeted in disease prevention strategies.
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Affiliation(s)
| | - Rui-Xue Lee
- MRC-University of Glasgow Centre for Virus Research, 464 Bearsden Road, Glasgow G61 1QH, UK
| | - Amelia Bennett
- The Pirbright Institute, Ash Road, Pirbright GU24 0NF, UK
- Department of Life Sciences, Faculty of Science, Claverton Down, University of Bath, Bath BA2 7AY, UK
| | - Lucas Aladar Wilson
- The Pirbright Institute, Ash Road, Pirbright GU24 0NF, UK
- Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, Foresterhill, University of Aberdeen, Aberdeen AB25 2ZD, UK
| | | | - Alain Kohl
- MRC-University of Glasgow Centre for Virus Research, 464 Bearsden Road, Glasgow G61 1QH, UK
| | - Isabelle Dietrich
- The Pirbright Institute, Ash Road, Pirbright GU24 0NF, UK
- MRC-University of Glasgow Centre for Virus Research, 464 Bearsden Road, Glasgow G61 1QH, UK
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Kietz C, Meinander A. Drosophila caspases as guardians of host-microbe interactions. Cell Death Differ 2023; 30:227-236. [PMID: 35810247 PMCID: PMC9950452 DOI: 10.1038/s41418-022-01038-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 06/22/2022] [Accepted: 06/22/2022] [Indexed: 11/09/2022] Open
Abstract
An intact cell death machinery is not only crucial for successful embryonic development and tissue homeostasis, but participates also in the defence against pathogens and contributes to a balanced immune response. Centrally involved in the regulation of both cell death and inflammatory immune responses is the evolutionarily conserved family of cysteine proteases named caspases. The Drosophila melanogaster genome encodes for seven caspases, several of which display dual functions, participating in apoptotic signalling and beyond. Among the Drosophila caspases, the caspase-8 homologue Dredd has a well-characterised role in inflammatory signalling activated by bacterial infections, and functions as a driver of NF-κB-mediated immune responses. Regarding the other Drosophila caspases, studies focusing on tissue-specific immune signalling and host-microbe interactions have recently revealed immunoregulatory functions of the initiator caspase Dronc and the effector caspase Drice. The aim of this review is to give an overview of the signalling cascades involved in the Drosophila humoral innate immune response against pathogens and of their caspase-mediated regulation. Furthermore, the apoptotic role of caspases during antibacterial and antiviral immune activation will be discussed.
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Affiliation(s)
- Christa Kietz
- Faculty of Science and Engineering, Cell Biology, Åbo Akademi University, BioCity, Turku, Finland
| | - Annika Meinander
- Faculty of Science and Engineering, Cell Biology, Åbo Akademi University, BioCity, Turku, Finland.
- InFLAMES Research Flagship Center, Åbo Akademi University, Turku, Finland.
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Analysis of the Toll and Spaetzle Genes Involved in Toll Pathway-Dependent Antimicrobial Gene Induction in the Red Flour Beetle, Tribolium castaneum (Coleoptera; Tenebrionidae). Int J Mol Sci 2023; 24:ijms24021523. [PMID: 36675034 PMCID: PMC9861120 DOI: 10.3390/ijms24021523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 01/10/2023] [Accepted: 01/11/2023] [Indexed: 01/14/2023] Open
Abstract
Insects rely only on their innate immune system to protect themselves from pathogens. Antimicrobial peptide (AMP) production is the main immune reaction in insects. In Drosophila melanogaster, the reaction is regulated mainly by the Toll and immune deficiency (IMD) pathways. Spaetzle proteins, activated by immune signals from upstream components, bind to Toll proteins, thus, activating the Toll pathway, which in turn, induces AMP genes. Previous studies have shown the difference in immune systems related to Toll and IMD pathways between D. melanogaster and Tribolium castaneum. In T. castaneum, nine Toll and seven spaetzle (spz) genes were identified. To extend our understanding of AMP production by T. castaneum, we conducted functional assays of Toll and spaetzle genes related to Toll-pathway-dependent AMP gene expression in T. castaneum under challenge with bacteria or budding yeast. The results revealed that Toll3 and Toll4 double-knockdown and spz7 knockdown strongly and moderately reduced the Toll-pathway-dependent expression of AMP genes, respectively. Moreover, Toll3 and Toll4 double-knockdown pupae more rapidly succumbed to entomopathogenic bacteria than the control pupae, but spz7 knockdown pupae did not. The results suggest that Toll3 and Toll4 play a large role in Toll-pathway-dependent immune reactions, whereas spz7 plays a small part.
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Petronio Petronio G, Pietrangelo L, Cutuli MA, Magnifico I, Venditti N, Guarnieri A, Abate GA, Yewhalaw D, Davinelli S, Di Marco R. Emerging Evidence on Tenebrio molitor Immunity: A Focus on Gene Expression Involved in Microbial Infection for Host-Pathogen Interaction Studies. Microorganisms 2022; 10:1983. [PMID: 36296259 PMCID: PMC9611967 DOI: 10.3390/microorganisms10101983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 09/30/2022] [Accepted: 10/02/2022] [Indexed: 08/13/2023] Open
Abstract
In recent years, the scientific community's interest in T. molitor as an insect model to investigate immunity and host-pathogen interactions has considerably increased. The reasons for this growing interest could be explained by the peculiar features of this beetle, which offers various advantages compared to other invertebrates models commonly used in laboratory studies. Thus, this review aimed at providing a broad view of the T. molitor immune system in light of the new scientific evidence on the developmental/tissue-specific gene expression studies related to microbial infection. In addition to the well-known cellular component and humoral response process, several studies investigating the factors associated with T. molitor immune response or deepening of those already known have been reported. However, various aspects remain still less understood, namely the possible crosstalk between the immune deficiency protein and Toll pathways and the role exerted by T. molitor apolipoprotein III in the expression of the antimicrobial peptides. Therefore, further research is required for T. molitor to be recommended as an alternative insect model for pathogen-host interaction and immunity studies.
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Affiliation(s)
- Giulio Petronio Petronio
- Department of Medicine and Health Science “V. Tiberio”, Università degli Studi del Molise, 8600 Campobasso, Italy
| | - Laura Pietrangelo
- Department of Medicine and Health Science “V. Tiberio”, Università degli Studi del Molise, 8600 Campobasso, Italy
| | - Marco Alfio Cutuli
- Department of Medicine and Health Science “V. Tiberio”, Università degli Studi del Molise, 8600 Campobasso, Italy
| | - Irene Magnifico
- Department of Medicine and Health Science “V. Tiberio”, Università degli Studi del Molise, 8600 Campobasso, Italy
| | - Noemi Venditti
- Department of Medicine and Health Science “V. Tiberio”, Università degli Studi del Molise, 8600 Campobasso, Italy
| | - Antonio Guarnieri
- Department of Medicine and Health Science “V. Tiberio”, Università degli Studi del Molise, 8600 Campobasso, Italy
| | - Getnet Atinafu Abate
- Department of Biology, College of Natural Sciences, Debre Markos University, Debre Markos P.O. Box 269, Ethiopia
| | - Delenasaw Yewhalaw
- School of Medical Laboratory Sciences, Faculty of Health Sciences, Jimma University, Jimma P.O. Box 307, Ethiopia
- Tropical and Infectious Diseases Research Center, Jimma University, Jimma P.O. Box 378, Ethiopia
| | - Sergio Davinelli
- Department of Medicine and Health Science “V. Tiberio”, Università degli Studi del Molise, 8600 Campobasso, Italy
| | - Roberto Di Marco
- Department of Medicine and Health Science “V. Tiberio”, Università degli Studi del Molise, 8600 Campobasso, Italy
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Bidoli C, Miccoli A, Buonocore F, Fausto AM, Gerdol M, Picchietti S, Scapigliati G. Transcriptome Analysis Reveals Early Hemocyte Responses upon In Vivo Stimulation with LPS in the Stick Insect Bacillus rossius (Rossi, 1788). INSECTS 2022; 13:insects13070645. [PMID: 35886821 PMCID: PMC9316843 DOI: 10.3390/insects13070645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/13/2022] [Accepted: 07/14/2022] [Indexed: 02/04/2023]
Abstract
Simple Summary Non-model insect species such as B. rossius suffer from a profound gap of knowledge regarding the temporal progression of physiological responses following the challenge with bacterial pathogens or cell wall components thereof. The reason for this mostly lies in the lack of genomic/transcriptomic resources, which would provide an unparalleled in-depth capacity in the analysis of molecular, biochemical, and metabolic mechanisms. We present a high-quality transcriptome obtained from high-coverage sequencing of hemocytes harvested from adult stick insect specimens both pre- and post-LPS stimulation. Such a resource served as the basis for a stringent differential gene expression and functional enrichment analyses, the results of which were characterized and discussed in depth. Selected transcripts encoding for C-type lectins and ML-domain containing proteins were further investigated from a phylogenetic perspective. Overall, these findings shed light on the physiological responses driven by a short-term LPS stimulation in the European stick insect. Abstract Despite a growing number of non-model insect species is being investigated in recent years, a greater understanding of their physiology is prevented by the lack of genomic resources. This is the case of the common European stick insect Bacillus rossius (Rossi, 1788): in this species, some knowledge is available on hemocyte-related defenses, but little is known about the physiological changes occurring in response to natural or experimental challenges. Here, the transcriptional signatures of adult B. rossius hemocytes were investigated after a short-term (2 h) LPS stimulation in vivo: a total of 2191 differentially expressed genes, mostly involved in proteolysis and carbohydrate and lipid metabolic processes, were identified in the de novo assembled transcriptome and in-depth discussed. Overall, the significant modulation of immune signals—such as C-type lectins, ML domain-containing proteins, serpins, as well as Toll signaling-related molecules—provide novel information on the early progression of LPS-induced responses in B. rossius.
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Affiliation(s)
- Carlotta Bidoli
- Department of Life Sciences, University of Trieste, 34127 Trieste, Italy; (C.B.); (M.G.)
| | - Andrea Miccoli
- Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, 01100 Viterbo, Italy; (F.B.); (A.M.F.); (S.P.); (G.S.)
- Correspondence:
| | - Francesco Buonocore
- Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, 01100 Viterbo, Italy; (F.B.); (A.M.F.); (S.P.); (G.S.)
| | - Anna Maria Fausto
- Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, 01100 Viterbo, Italy; (F.B.); (A.M.F.); (S.P.); (G.S.)
| | - Marco Gerdol
- Department of Life Sciences, University of Trieste, 34127 Trieste, Italy; (C.B.); (M.G.)
| | - Simona Picchietti
- Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, 01100 Viterbo, Italy; (F.B.); (A.M.F.); (S.P.); (G.S.)
| | - Giuseppe Scapigliati
- Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, 01100 Viterbo, Italy; (F.B.); (A.M.F.); (S.P.); (G.S.)
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Moure UAE, Tan T, Sha L, Lu X, Shao Z, Yang G, Wang Y, Cui H. Advances in the Immune Regulatory Role of Non-Coding RNAs (miRNAs and lncRNAs) in Insect-Pathogen Interactions. Front Immunol 2022; 13:856457. [PMID: 35464405 PMCID: PMC9020863 DOI: 10.3389/fimmu.2022.856457] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 03/10/2022] [Indexed: 11/30/2022] Open
Abstract
Insects are by far the most abundant and diverse living organisms on earth and are frequently prone to microbial attacks. In other to counteract and overcome microbial invasions, insects have in an evolutionary way conserved and developed immune defense mechanisms such as Toll, immune deficiency (Imd), and JAK/STAT signaling pathways leading to the expression of antimicrobial peptides. These pathways have accessory immune effector mechanisms, such as phagocytosis, encapsulation, melanization, nodulation, RNA interference (RNAi), lysis, autophagy, and apoptosis. However, pathogens evolved strategies that circumvent host immune response following infections, which may have helped insects further sophisticate their immune response mechanisms. The involvement of ncRNAs in insect immunity is undeniable, and several excellent studies or reviews have investigated and described their roles in various insects. However, the functional analyses of ncRNAs in insects upon pathogen attacks are not exhaustive as novel ncRNAs are being increasingly discovered in those organisms. This article gives an overview of the main insect signaling pathways and effector mechanisms activated by pathogen invaders and summarizes the latest findings of the immune modulation role of both insect- and pathogen-encoded ncRNAs, especially miRNAs and lncRNAs during insect–pathogen crosstalk.
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Affiliation(s)
- Ulrich Aymard Ekomi Moure
- Affiliated Hospital of Southwest University, the Ninth People's Hospital of Chongqing, Chongqing, China.,Medical Research Institute, Southwest University, Chongqing, China
| | - Tingshan Tan
- Affiliated Hospital of Southwest University, the Ninth People's Hospital of Chongqing, Chongqing, China
| | - Lin Sha
- Affiliated Hospital of Southwest University, the Ninth People's Hospital of Chongqing, Chongqing, China
| | - Xiaoqin Lu
- Affiliated Hospital of Southwest University, the Ninth People's Hospital of Chongqing, Chongqing, China
| | - Zhi Shao
- Affiliated Hospital of Southwest University, the Ninth People's Hospital of Chongqing, Chongqing, China
| | - Guang Yang
- Affiliated Hospital of Southwest University, the Ninth People's Hospital of Chongqing, Chongqing, China
| | - Yi Wang
- Affiliated Hospital of Southwest University, the Ninth People's Hospital of Chongqing, Chongqing, China.,Department of Gastrointestinal Surgery, the Ninth People's Hospital of Chongqing, Chongqing, China
| | - Hongjuan Cui
- Medical Research Institute, Southwest University, Chongqing, China.,State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, Southwest University, Chongqing, China
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12
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Sensing microbial infections in the Drosophila melanogaster genetic model organism. Immunogenetics 2022; 74:35-62. [DOI: 10.1007/s00251-021-01239-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 11/20/2021] [Indexed: 12/17/2022]
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13
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Zheng Q, Gao N, Sun Q, Li X, Wang Y, Xiao H. bfc, a novel serpent co-factor for the expression of croquemort, regulates efferocytosis in Drosophila melanogaster. PLoS Genet 2021; 17:e1009947. [PMID: 34860835 PMCID: PMC8673676 DOI: 10.1371/journal.pgen.1009947] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 12/15/2021] [Accepted: 11/15/2021] [Indexed: 01/01/2023] Open
Abstract
Efferocytosis is the process by which phagocytes recognize, engulf, and digest (or clear) apoptotic cells during development. Impaired efferocytosis is associated with developmental defects and autoimmune diseases. In Drosophila melanogaster, recognition of apoptotic cells requires phagocyte surface receptors, including the scavenger receptor CD36-related protein, Croquemort (Crq, encoded by crq). In fact, Crq expression is upregulated in the presence of apoptotic cells, as well as in response to excessive apoptosis. Here, we identified a novel gene bfc (booster for croquemort), which plays a role in efferocytosis, specifically the regulation of the crq expression. We found that Bfc protein interacts with the zinc finger domain of the GATA transcription factor Serpent (Srp), to enhance its direct binding to the crq promoter; thus, they function together in regulating crq expression and efferocytosis. Overall, we show that Bfc serves as a Srp co-factor to upregulate the transcription of the crq encoded receptor, and consequently boosts macrophage efferocytosis in response to excessive apoptosis. Therefore, this study clarifies how phagocytes integrate apoptotic cell signals to mediate efferocytosis.
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Affiliation(s)
- Qian Zheng
- College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Ning Gao
- College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Qiling Sun
- College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Xiaowen Li
- College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Yanzhe Wang
- College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Hui Xiao
- College of Life Sciences, Shaanxi Normal University, Xi’an, China
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14
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Regulators and signalling in insect antimicrobial innate immunity: Functional molecules and cellular pathways. Cell Signal 2021; 83:110003. [PMID: 33836260 DOI: 10.1016/j.cellsig.2021.110003] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/02/2021] [Accepted: 04/02/2021] [Indexed: 12/29/2022]
Abstract
Insects possess an immune system that protects them from attacks by various pathogenic microorganisms that would otherwise threaten their survival. Immune mechanisms may deal directly with the pathogens by eliminating them from the host organism or disarm them by suppressing the synthesis of toxins and virulence factors that promote the invasion and destructive action of the intruder within the host. Insects have been established as outstanding models for studying immune system regulation because innate immunity can be explored as an integrated system at the level of the whole organism. Innate immunity in insects consists of basal immunity that controls the constitutive synthesis of effector molecules such as antimicrobial peptides, and inducible immunity that is activated after detection of a microbe or its product(s). Activation and coordination of innate immune defenses in insects involve evolutionary conserved immune factors. Previous research in insects has led to the identification and characterization of distinct immune signalling pathways that modulate the response to microbial infections. This work has not only advanced the field of insect immunology, but it has also rekindled interest in the innate immune system of mammals. Here we review the current knowledge on key molecular components of insect immunity and discuss the opportunities they present for confronting infectious diseases in humans.
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15
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Li R, Yao X, Zhou H, Jin P, Ma F. The Drosophila miR-959-962 Cluster Members Repress Toll Signaling to Regulate Antibacterial Defense during Bacterial Infection. Int J Mol Sci 2021; 22:ijms22020886. [PMID: 33477373 PMCID: PMC7831006 DOI: 10.3390/ijms22020886] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 01/11/2021] [Accepted: 01/14/2021] [Indexed: 11/16/2022] Open
Abstract
MicroRNAs (miRNAs) are a class of ~22 nt non-coding RNA molecules in metazoans capable of down-regulating target gene expression by binding to the complementary sites in the mRNA transcripts. Many individual miRNAs are implicated in a broad range of biological pathways, but functional characterization of miRNA clusters in concert is limited. Here, we report that miR-959-962 cluster (miR-959/960/961/962) can weaken Drosophila immune response to bacterial infection evidenced by the reduced expression of antimicrobial peptide Drosomycin (Drs) and short survival within 24 h upon infection. Each of the four miRNA members is confirmed to contribute to the reduced Drs expression and survival rate of Drosophila. Mechanically, RT-qPCR and Dual-luciferase reporter assay verify that tube and dorsal (dl) mRNAs, key components of Toll pathway, can simultaneously be targeted by miR-959 and miR-960, miR-961, and miR-962, respectively. Furthermore, miR-962 can even directly target to the 3' untranslated region (UTR) of Toll. In addition, the dynamic expression pattern analysis in wild-type flies reveals that four miRNA members play important functions in Drosophila immune homeostasis restoration at the late stage of Micrococcus luteus (M. luteus) infection. Taken together, our results identify four miRNA members from miR-959-962 cluster as novel suppressors of Toll signaling and enrich the repertoire of immune-modulating miRNA in Drosophila.
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Affiliation(s)
| | | | | | - Ping Jin
- Correspondence: (P.J.); (F.M.); Tel.: +86-25-85891852 (P.J.); +86-25-85891852 (F.M.)
| | - Fei Ma
- Correspondence: (P.J.); (F.M.); Tel.: +86-25-85891852 (P.J.); +86-25-85891852 (F.M.)
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16
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Yashin DV, Sashchenko LP, Georgiev GP. Mechanisms of Action of the PGLYRP1/Tag7 Protein in Innate and Acquired Immunity. Acta Naturae 2021; 13:91-101. [PMID: 33959389 PMCID: PMC8084298 DOI: 10.32607/actanaturae.11102] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 10/19/2020] [Indexed: 11/20/2022] Open
Abstract
One of the promising fields of modern molecular biology is the search for new proteins that regulate the various stages of the immune response and the investigation of the molecular mechanisms of action of these proteins. Such proteins include the multifunctional protein PGLYRP1/Tag7, belonging to the PGRP-S protein family, whose gene was discovered in mice at the Institute of Gene Biology, Russian Academy of Sciences, in 1996. PGLYRP1/Tag7 is classified as a protein of innate immunity; however, it can also participate in the regulation of acquired immunity mechanisms. In this paper, we consider the involvement of PGLYRP1/Tag7 in the triggering of antimicrobial defense mechanisms and formation of subsets of cytotoxic lymphocytes that kill tumor cells. The paper emphasizes that the multifaceted functional activity of Tag7 in the immune response has to do with its ability to interact with various proteins to form stable protein complexes. Hsp70-associated Tag7 can induce the death of tumor cells carrying the TNFR1 receptor. Tag7, associated with the Mts1 (S100A4) protein, can stimulate the migration of innate and adaptive immune cytotoxic lymphocytes to a lesion site. Involvement of Tag7 in the regulation of immunological processes suggests that it may be considered as a promising agent in cancer therapy. These properties of Tag7 were used to develop autologous vaccines that have passed the first and second phases of clinical trials in patients with end-stage melanoma and renal cancer. The C-terminal peptide of Tag7, isolated by limited proteolysis, was shown to protect the cartilage and bone tissue of the ankle joint in mice with induced autoimmune arthritis and may be a promising drug for suppressing the development of inflammatory processes.
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Affiliation(s)
- D. V. Yashin
- Institute of Gene Biology RAS, Moscow, 119334 Russia
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17
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Salcedo-Porras N, Noor S, Cai C, Oliveira PL, Lowenberger C. Rhodnius prolixus uses the peptidoglycan recognition receptor rpPGRP-LC/LA to detect Gram-negative bacteria and activate the IMD pathway. CURRENT RESEARCH IN INSECT SCIENCE 2021; 1:100006. [PMID: 36003603 PMCID: PMC9387487 DOI: 10.1016/j.cris.2020.100006] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 12/09/2020] [Accepted: 12/09/2020] [Indexed: 05/05/2023]
Abstract
Insects rely on an innate immune system to recognize and eliminate pathogens. Key components of this system are highly conserved across all invertebrates. To detect pathogens, insects use Pattern recognition receptors (PRRs) that bind to signature motifs on the surface of pathogens called Pathogen Associated Molecular Patterns (PAMPs). In general, insects use peptidoglycan recognition proteins (PGRPs) in the Immune Deficiency (IMD) pathway to detect Gram-negative bacteria, and other PGRPs and Gram-negative binding proteins (GNBPs) in the Toll pathway to detect Gram-positive bacteria and fungi, although there is crosstalk and cooperation between these and other pathways. Once pathogens are recognized, these pathways activate the production of potent antimicrobial peptides (AMPs). Most PRRs in insects have been reported from genome sequencing initiatives but few have been characterized functionally. The initial studies on insect PRRs were done using established dipteran model organisms such as Drosophila melanogaster, but there are differences in the numbers and functional role of PRRs in different insects. Here we describe the genomic repertoire of PGRPs in Rhodnius prolixus, a hemimetabolous hemipteran vector of the parasite Trypanosoma cruzi that causes Chagas disease in humans. Using a de novo transcriptome from the fat body of immune activated insects, we found 5 genes encoding PGRPs. Phylogenetic analysis groups R. prolixus PGRPs with D. melanogaster PGRP-LA, which is involved in the IMD pathway in the respiratory tract. A single R. prolixus PGRP gene encodes isoforms that contain an intracellular region or motif (cryptic RIP Homotypic Interaction Motif-cRHIM) that is involved in the IMD signaling pathway in D. melanogaster. We characterized and silenced this gene using RNAi and show that the PGRPs that contain cRHIMs are involved in the recognition of Gram-negative bacteria, and activation of the IMD pathway in the fat body of R. prolixus, similar to the PGRP-LC of D. melanogaster. This is the first functional characterization of a PGRP containing a cRHIM motif that serves to activate the IMD pathway in a hemimetabolous insect.
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Key Words
- AMP, Antimicrobial Peptide
- Antimicrobial peptides
- GNBP, Gram-negative Binding Protein
- Gr+, Gram-positive
- Gr-, Gram-negative
- IMD pathway
- IMD, Immune Deficiency
- Innate immunity
- ML, Maximum Likelihood
- PAMP, Pathogen-Associated Molecular Pattern
- PGN, Peptidoglycan
- PGRP
- PGRP, Peptidoglycan Recognition Protein
- PRR, Pattern Recognition Receptor
- RHIM
- RNAi, RNA interference
- SMOC, Supramolecular Organizing Centres
- TPM, Transcripts Per Million
- Triatomines
- cRHIM, cryptic RIP Homotypic Interaction Motif
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Affiliation(s)
- Nicolas Salcedo-Porras
- Centre for Cell Biology, Development and Disease, Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
- Corresponding author.
| | - Shireen Noor
- Centre for Cell Biology, Development and Disease, Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - Charley Cai
- Centre for Cell Biology, Development and Disease, Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - Pedro L. Oliveira
- Instituto de Bioquímica Médica, Universidade Federal do Rio de Janeiro, CCS, Ilha do Fundão, Rio de Janeiro, Brazil
| | - Carl Lowenberger
- Centre for Cell Biology, Development and Disease, Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
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18
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Assembly of Peptidoglycan Fragments-A Synthetic Challenge. Pharmaceuticals (Basel) 2020; 13:ph13110392. [PMID: 33203094 PMCID: PMC7696421 DOI: 10.3390/ph13110392] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/09/2020] [Accepted: 11/12/2020] [Indexed: 11/19/2022] Open
Abstract
Peptidoglycan (PGN) is a major constituent of most bacterial cell walls that is recognized as a primary target of the innate immune system. The availability of pure PGN molecules has become key to different biological studies. This review aims to (1) provide an overview of PGN biosynthesis, focusing on the main biosynthetic intermediates; (2) focus on the challenges for chemical synthesis posed by the unique and complex structure of PGN; and (3) cover the synthetic routes of PGN fragments developed to date. The key difficulties in the synthesis of PGN molecules mainly involve stereoselective glycosylation involving NAG derivatives. The complex synthesis of the carbohydrate backbone commonly involves multistep sequences of chemical reactions to install the lactyl moiety at the O-3 position of NAG derivatives and to control enantioselective glycosylation. Recent advances are presented and synthetic routes are described according to the main strategy used: (i) based on the availability of starting materials such as glucosamine derivatives; (ii) based on a particular orthogonal synthesis; and (iii) based on the use of other natural biopolymers as raw materials.
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19
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Alameh S, Bartolo G, O’Brien S, Henderson EA, Gonzalez LO, Hartmann S, Klimko CP, Shoe JL, Cote CK, Grill LK, Levitin A, Martchenko Shilman M. Anthrax toxin component, Protective Antigen, protects insects from bacterial infections. PLoS Pathog 2020; 16:e1008836. [PMID: 32866212 PMCID: PMC7458312 DOI: 10.1371/journal.ppat.1008836] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 07/24/2020] [Indexed: 01/23/2023] Open
Abstract
Anthrax is a major zoonotic disease of wildlife, and in places like West Africa, it can be caused by Bacillus anthracis in arid nonsylvatic savannahs, and by B. cereus biovar anthracis (Bcbva) in sylvatic rainforests. Bcbva-caused anthrax has been implicated in as much as 38% of mortality in rainforest ecosystems, where insects can enhance the transmission of anthrax-causing bacteria. While anthrax is well-characterized in mammals, its transmission by insects points to an unidentified anthrax-resistance mechanism in its vectors. In mammals, a secreted anthrax toxin component, 83 kDa Protective Antigen (PA83), binds to cell-surface receptors and is cleaved by furin into an evolutionary-conserved PA20 and a pore-forming PA63 subunits. We show that PA20 increases the resistance of Drosophila flies and Culex mosquitoes to bacterial challenges, without directly affecting the bacterial growth. We further show that the PA83 loop known to be cleaved by furin to release PA20 from PA63 is, in part, responsible for the PA20-mediated protection. We found that PA20 binds directly to the Toll activating peptidoglycan-recognition protein-SA (PGRP-SA) and that the Toll/NF-κB pathway is necessary for the PA20-mediated protection of infected flies. This effect of PA20 on innate immunity may also exist in mammals: we show that PA20 binds to human PGRP-SA ortholog. Moreover, the constitutive activity of Imd/NF-κB pathway in MAPKK Dsor1 mutant flies is sufficient to confer the protection from bacterial infections in a manner that is independent of PA20 treatment. Lastly, Clostridium septicum alpha toxin protects flies from anthrax-causing bacteria, showing that other pathogens may help insects resist anthrax. The mechanism of anthrax resistance in insects has direct implications on insect-mediated anthrax transmission for wildlife management, and with potential for applications, such as reducing the sensitivity of pollinating insects to bacterial pathogens.
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Affiliation(s)
- Saleem Alameh
- Henry E. Riggs School of Applied Life Sciences, Keck Graduate Institute, Claremont, California, United States of America
| | - Gloria Bartolo
- Henry E. Riggs School of Applied Life Sciences, Keck Graduate Institute, Claremont, California, United States of America
| | - Summer O’Brien
- Henry E. Riggs School of Applied Life Sciences, Keck Graduate Institute, Claremont, California, United States of America
| | - Elizabeth A. Henderson
- Henry E. Riggs School of Applied Life Sciences, Keck Graduate Institute, Claremont, California, United States of America
| | - Leandra O. Gonzalez
- Henry E. Riggs School of Applied Life Sciences, Keck Graduate Institute, Claremont, California, United States of America
| | - Stella Hartmann
- Henry E. Riggs School of Applied Life Sciences, Keck Graduate Institute, Claremont, California, United States of America
| | - Christopher P. Klimko
- Bacteriology Division, US Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, United States of America
| | - Jennifer L. Shoe
- Bacteriology Division, US Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, United States of America
| | - Christopher K. Cote
- Bacteriology Division, US Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, United States of America
| | - Laurence K. Grill
- Henry E. Riggs School of Applied Life Sciences, Keck Graduate Institute, Claremont, California, United States of America
| | - Anastasia Levitin
- Henry E. Riggs School of Applied Life Sciences, Keck Graduate Institute, Claremont, California, United States of America
- * E-mail: (AL); (MMS)
| | - Mikhail Martchenko Shilman
- Henry E. Riggs School of Applied Life Sciences, Keck Graduate Institute, Claremont, California, United States of America
- * E-mail: (AL); (MMS)
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20
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Edosa TT, Jo YH, Keshavarz M, Kim IS, Han YS. Biosurfactants Induce Antimicrobial Peptide Production through the Activation of TmSpatzles in Tenebrio molitor. Int J Mol Sci 2020; 21:ijms21176090. [PMID: 32847078 PMCID: PMC7504391 DOI: 10.3390/ijms21176090] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 08/14/2020] [Accepted: 08/20/2020] [Indexed: 12/12/2022] Open
Abstract
Biosurfactant immunomodulatory activities in mammals, nematodes, and plants have been investigated. However, the immune activation property of biosurfactants in insects has not been reported. Therefore, here, we studied the defense response triggered by lipopeptides (fengycin and iturin A), glycolipids (rhamnolipid), and cyclic polypeptides (bacitracin) in the coleopteran insect, mealworm Tenebrio molitor. The in vitro antimicrobial activities against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria and fungi (Candida albicans) were assessed by mixing these pathogens with the hemolymph of biosurfactant-immune-activated larvae. E. coli growth was remarkably inhibited by this hemolymph. The antimicrobial peptide (AMP) induction results also revealed that all biosurfactants tested induced several AMPs, exclusively in hemocytes. The survivability analysis of T. molitor larvae challenged by E. coli (106 CFU/µL) at 24 h post biosurfactant-immune activation showed that fengycin, iturin A, and rhamnopid significantly increased survivability against E. coli. Biosurfactant-induced TmSpatzles activation was also monitored, and the results showed that TmSpz3 and TmSpz-like were upregulated in the hemocytes of iturin A-injected larvae, while TmSpz4 and TmSpz6 were upregulated in the fat bodies of the fengycin-, iturin A-, and rhamnolipid-injected larvae. Overall, these results suggest that lipopeptide and glycolipid biosurfactants induce the expression of AMPs in T. molitor via the activation of spätzle genes, thereby increasing the survivability of T. molitor against E. coli.
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Affiliation(s)
- Tariku Tesfaye Edosa
- Department of Applied Biology, Institute of Environmentally-Friendly Agriculture (IEFA), College of Agriculture and Life Sciences, Chonnam National University, Gwangju 61186, Korea; (T.T.E.); (Y.H.J.); (M.K.)
- Ethiopian Institute of Agricultural Research, Ambo Agricultural Research Center, Ambo 37, Ethiopia
| | - Yong Hun Jo
- Department of Applied Biology, Institute of Environmentally-Friendly Agriculture (IEFA), College of Agriculture and Life Sciences, Chonnam National University, Gwangju 61186, Korea; (T.T.E.); (Y.H.J.); (M.K.)
| | - Maryam Keshavarz
- Department of Applied Biology, Institute of Environmentally-Friendly Agriculture (IEFA), College of Agriculture and Life Sciences, Chonnam National University, Gwangju 61186, Korea; (T.T.E.); (Y.H.J.); (M.K.)
| | - In Seon Kim
- Department of Agricultural Chemistry, College of Agriculture and Life Sciences, Chonnam National University, Gwangju 61186, Korea;
| | - Yeon Soo Han
- Ethiopian Institute of Agricultural Research, Ambo Agricultural Research Center, Ambo 37, Ethiopia
- Correspondence: ; Tel.: +82-62-530-2072
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21
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TmPGRP-SA regulates Antimicrobial Response to Bacteria and Fungi in the Fat Body and Gut of Tenebrio molitor. Int J Mol Sci 2020; 21:ijms21062113. [PMID: 32204438 PMCID: PMC7139795 DOI: 10.3390/ijms21062113] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 03/09/2020] [Accepted: 03/17/2020] [Indexed: 12/13/2022] Open
Abstract
Antimicrobial immune response is mediated by a signal-transducing sensor, peptidoglycan recognition protein-SA (PGRP-SA), that can recognize non-self molecules. Although several studies have focused on the involvement of Drosophila PGRP-SA in antimicrobial peptide (AMP) expression in response to infections, studies on its role in Tenebrio molitor are lacking. Here, we present a functional analysis of T. molitor PGRP-SA (TmPGRP-SA). In the absence of microbes, TmPGRP-SA was highly expressed in the late-larval fat body, followed by hemocytes, and gut. Interestingly, following Escherichia coli, Staphylococcus aureus, and Candida albicans infections, the mRNA level of TmPGRP-SA was significantly upregulated in both the fat body and gut. TmPGRP-SA silencing had a significant effect on the mortality rates for all the microbes tested. Moreover, TmPGRP-SA is required for regulating the expression of eight AMP genes namely TmTenecin-1, -2, and -4; TmDefensin-1 and -2; TmColeoptericin-1; and TmAttacin-1b and -2 in the fat body in response to E. coli and S. aureus infections. TmPGRP-SA is essential for the transcription of TmTenecin-2, -4; TmDefensin-2; TmColeoptericin-1, -2; and TmAttacin-1a, -1b, and -2 in the gut upon E. coli and C. albicans infections. However, TmPGRP-SA does not regulate AMP expression in the hemocytes. Additionally, TmDorsal isoform X2, a downstream Toll transcription factor, was downregulated in TmPGRP-SA-silenced larval fat body following E. coli and S. aureus challenges, and in the gut following E. coli and C. albicans challenges.
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22
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The Unique Antimicrobial Recognition and Signaling Pathways in Tardigrades with a Comparison Across Ecdysozoa. G3-GENES GENOMES GENETICS 2020; 10:1137-1148. [PMID: 31969428 PMCID: PMC7056985 DOI: 10.1534/g3.119.400734] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Tardigrades are microscopic animals known to withstand unfavorable abiotic conditions. These animals are also constantly exposed to biotic stresses, including parasites and internal microbiomes. However, the tardigrade immune mechanisms against these biotic stresses are largely uncharacterized. Due to the contentious phylogenetic position of tardigrades, it is not intuitive whether they possess an immune system more similar to that of arthropods (e.g., Toll, Imd, and JNK pathways of the Drosophila melanogaster antimicrobial response) or to that of nematodes (e.g., the Tir-1/Nsy-1/Sek-1/Pmk-1/Atf-7 signaling cassette [called Tir-1 pathway here]) in Caenorhabditis elegans). In this study, comparative genomic analyses were conducted to mine homologs of canonical D. melanogaster and C. elegans immune pathway genes from eight tardigrades (Echiniscoides cf. sigismundi, Echiniscus testudo, Hypsibius exemplaris, Mesobiotus philippinicus, Milnesium tardigradum, Paramacrobiotus richtersi, Richtersius cf. coronifer, and Ramazzottius varieornatus) and four non-arthropod ecdysozoans (two onychophorans: Epiperipatus sp. and Opisthopatus kwazululandi; one nematomorph: Paragordius varius; and one priapulan: Priapulus caudatus) in order to provide insights into the tardigrade antimicrobial system. No homologs of the intracellular components of the Toll pathway were detected in any of the tardigrades examined. Likewise, no homologs of most of the Imd pathway genes were detected in any of the tardigrades or any of the other non-arthropod ecdysozoans. Both the JNK and Tir-1 pathways, on the other hand, were found to be conserved across ecdysozoans. Interestingly, tardigrades had no detectable homologs of NF-κB, the major activator of antimicrobial response gene expression. Instead, tardigrades appear to possess NF-κB distantly related NFAT homologs. Overall, our results show that tardigrades have a unique gene pathway repertoire that differs from that of other ecdysozoans. Our study also provides a framework for future studies on tardigrade immune responses.
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Toll-like Receptors and the Control of Immunity. Cell 2020; 180:1044-1066. [DOI: 10.1016/j.cell.2020.02.041] [Citation(s) in RCA: 567] [Impact Index Per Article: 141.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 02/02/2020] [Accepted: 02/18/2020] [Indexed: 12/14/2022]
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Lu Y, Su F, Li Q, Zhang J, Li Y, Tang T, Hu Q, Yu XQ. Pattern recognition receptors in Drosophila immune responses. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2020; 102:103468. [PMID: 31430488 DOI: 10.1016/j.dci.2019.103468] [Citation(s) in RCA: 90] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/07/2019] [Accepted: 08/16/2019] [Indexed: 05/08/2023]
Abstract
Insects, which lack the adaptive immune system, have developed sophisticated innate immune system consisting of humoral and cellular immune responses to defend against invading microorganisms. Non-self recognition of microbes is the front line of the innate immune system. Repertoires of pattern recognition receptors (PRRs) recognize the conserved pathogen-associated molecular patterns (PAMPs) present in microbes, such as lipopolysaccharide (LPS), peptidoglycan (PGN), lipoteichoic acid (LTA) and β-1, 3-glucans, and induce innate immune responses. In this review, we summarize current knowledge of the structure, classification and roles of PRRs in innate immunity of the model organism Drosophila melanogaster, focusing mainly on the peptidoglycan recognition proteins (PGRPs), Gram-negative bacteria-binding proteins (GNBPs), scavenger receptors (SRs), thioester-containing proteins (TEPs), and lectins.
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Affiliation(s)
- Yuzhen Lu
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China; Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China
| | - Fanghua Su
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China
| | - Qilin Li
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China
| | - Jie Zhang
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China
| | - Yanjun Li
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China
| | - Ting Tang
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China
| | - Qihao Hu
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China
| | - Xiao-Qiang Yu
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China; Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, China.
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25
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Queda F, Covas G, Silva T, Santos CA, Bronze MR, Cañada FJ, Corvo MC, Filipe SR, Marques MMB. A top-down chemo-enzymatic approach towards N-acetylglucosamine-N-acetylmuramic oligosaccharides: Chitosan as a reliable template. Carbohydr Polym 2019; 224:115133. [DOI: 10.1016/j.carbpol.2019.115133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 07/15/2019] [Accepted: 07/25/2019] [Indexed: 10/26/2022]
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Caicedo PA, Serrato IM, Sim S, Dimopoulos G, Coatsworth H, Lowenberger C, Ocampo CB. Immune response-related genes associated to blocking midgut dengue virus infection in Aedes aegypti strains that differ in susceptibility. INSECT SCIENCE 2019; 26:635-648. [PMID: 29389079 DOI: 10.1111/1744-7917.12573] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 12/19/2017] [Accepted: 01/15/2018] [Indexed: 06/07/2023]
Abstract
Aedes (Stegomyia) aegypti, the principal global vector of dengue viruses, has differences in its susceptibility to dengue virus infection. We compared the global expression of genes in the midguts of Colombian Ae. aegypti dengue-susceptible (Cali-S) and dengue-refractory (Cali-MIB) field derived strains after ingesting either a sugarmeal, a bloodmeal, or a bloodmeal containing dengue virus serotype 2 (DENV-2). Microarray-based transcriptome analysis among treatments indicated a total of 4725 transcripts with differential expression between the two strains. Eleven genes were selected from different functional groups based on their significant up or down expression levels as well as reports in the literature suggesting they are associated with dengue virus elimination. We measured mRNA abundance of these 11 genes at 0, 8, 24, and 36 h postinfection using quantitative real time PCR (qPCR) to confirm the microarray results and assess any temporal patterns. Four genes were selected (Gram-negative binding protein-GNBP [AAEL009176], Niemann Pick Type-C2-NPC2 [AAEL015136], Keratinocyte lectin [AAEL009842], and Cathepsin-b [AAEL007585]) for knockdown experiments using RNA interference (RNAi) methodology to determine the phenotype (DENV-2 susceptible or refractory). Silencing GNBP, Cathepsin-b and Keratinocyte lectin reduced the percentage of mosquitoes with disseminated virus in the Cali-S strain to 8%, 20%, and 12% respectively compared with 96% in the controls. Silencing of NPC2 increased the percentage of mosquitos with disseminated virus infections in Cali-MIB to 66% compared with 35% in the controls. This study provides insight into genes that may contribute to the Cali-S susceptible and Cali-MIB refractory phenotypes in Ae. aegypti.
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Affiliation(s)
- Paola A Caicedo
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Idalba Mildred Serrato
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Shuzhen Sim
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - George Dimopoulos
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - Heather Coatsworth
- Department of Biological Sciences, Simon Fraser University, Burnaby, Canada
| | - Carl Lowenberger
- Department of Biological Sciences, Simon Fraser University, Burnaby, Canada
| | - Clara B Ocampo
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
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27
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Zhang RN, Li CT, Ren FF, Ye MQ, Deng XJ, Yi HY, Cao Y, Yang WY. Functional characterization of short-type peptidoglycan recognition proteins (PGRPs) from silkworm Bombyx mori in innate immunity. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2019; 95:59-67. [PMID: 30708025 DOI: 10.1016/j.dci.2019.01.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 01/28/2019] [Accepted: 01/29/2019] [Indexed: 06/09/2023]
Abstract
Peptidoglycan recognition proteins (PGRPs) are members of an important class of pattern recognition receptors in insects that can specifically recognize peptidoglycan (PGN) in bacterial cell walls and participate in immune regulation and bacterial clearance. Although the role of PGRPs in regulating the innate immune response in Drosophila melanogaster has been studied, little is known regarding PGRPs in Lepidoptera species. In this study, five short (S)-type Bombyx mori PGRPs (BmPGRPs) were cloned, expressed, and evaluated for their function in innate immunity. B. mori larvae that were injected with the gram-positive bacterium Bacillus megaterium or the gram-negative bacterium Escherichia coli exhibited a rapid and significant upregulation in S-type BmPGRP expression. The results showed that the five evaluated BmPGRPs have significant agglutination activity toward E. coli and B. megaterium and more notable amidase activity toward meso-diaminopimelic acid peptidoglycan (DAP-PGN). Furthermore, only in the presence of BmPGRP-S5 did B. mori larval hemocytes exhibit significant phagocytosis against E. coli and B. megaterium.
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Affiliation(s)
- Ruo-Nan Zhang
- Laboratory of Insect Molecular Biology and Biotechnology, Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China
| | - Cai-Ting Li
- Laboratory of Insect Molecular Biology and Biotechnology, Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China
| | - Fei-Fei Ren
- Laboratory of Insect Molecular Biology and Biotechnology, Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China
| | - Ming-Qiang Ye
- The Sericultural and Agri-Food Research Institute of the Guangdong Academy of Agricultural Sciences, Guangzhou, 510642, China
| | - Xiao-Juan Deng
- Laboratory of Insect Molecular Biology and Biotechnology, Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China
| | - Hui-Yu Yi
- Laboratory of Insect Molecular Biology and Biotechnology, Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China
| | - Yang Cao
- Laboratory of Insect Molecular Biology and Biotechnology, Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.
| | - Wan-Ying Yang
- Laboratory of Insect Molecular Biology and Biotechnology, Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.
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28
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Schlöffel MA, Käsbauer C, Gust AA. Interplay of plant glycan hydrolases and LysM proteins in plant-Bacteria interactions. Int J Med Microbiol 2019; 309:252-257. [PMID: 31079999 DOI: 10.1016/j.ijmm.2019.04.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 04/10/2019] [Accepted: 04/25/2019] [Indexed: 12/18/2022] Open
Abstract
Plants are always found together with bacteria and other microbes. Although plants can be attacked by phytopathogenic bacteria, they are more often engaged in neutral or mutualistic bacterial interactions. In the soil, plants associate with rhizobia or other plant growth promoting rhizosphere bacteria; above ground, bacteria colonise plants as epi- and endophytes. For mounting appropriate responses, such as permitting colonisation by beneficial symbionts while at the same time fending off pathogenic invaders, plants need to distinguish between the "good" and the "bad". Plants make use of proteins containing the lysin motif (LysM) for perception of N-acetylglucosamine containing carbohydrate structures, such as chitooligosaccharides functioning as symbiotic nodulation factors or bacterial peptidoglycan. Moreover, plant hydrolytic enzymes of the chitinase family, which are able to cleave bacterial peptidoglycan or chitooligosaccharides, are essential for cellular signalling induced by rhizobial nodulation factors during symbiosis as well as bacterial peptidoglycan during pathogenesis. Hence, LysM receptors seem to work in concert with hydrolytic enzymes that fine-tune ligand availability to either allow symbiotic interactions or trigger plant immunity.
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Affiliation(s)
- Maria A Schlöffel
- Plant Biochemistry, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany
| | - Christoph Käsbauer
- Plant Biochemistry, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany
| | - Andrea A Gust
- Plant Biochemistry, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany.
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29
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Wang Q, Ren M, Liu X, Xia H, Chen K. Peptidoglycan recognition proteins in insect immunity. Mol Immunol 2018; 106:69-76. [PMID: 30590209 DOI: 10.1016/j.molimm.2018.12.021] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 12/05/2018] [Accepted: 12/20/2018] [Indexed: 12/22/2022]
Abstract
Insects lack an acquired immune system and rely solely on the innate immune system to combat microbial infection. The innate immunity of insects mainly depends on the interaction between the host's pattern recognition receptor (PRR) and pathogen-associated molecular pattern (PAMP). The peptidoglycan recognition proteins (PGRPs) family is the most important pattern recognition receptor (PRR) for insects. It can recognize the main component of the cell wall of the pathogenic microorganism, peptidoglycan (PGN), and plays an important role in the innate immunity of insects. In this paper, the structure, classification, and function of PGRPs is summarized, and the role of PGRPs in the innate immunity of insects is also discussed.
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Affiliation(s)
- Qiang Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, PR China; Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, PR China
| | - Meijia Ren
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, PR China
| | - Xiaoyong Liu
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, PR China
| | - Hengchuan Xia
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, PR China
| | - Keping Chen
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, PR China.
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30
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Fuchs K, Cardona Gloria Y, Wolz OO, Herster F, Sharma L, Dillen CA, Täumer C, Dickhöfer S, Bittner Z, Dang TM, Singh A, Haischer D, Schlöffel MA, Koymans KJ, Sanmuganantham T, Krach M, Roger T, Le Roy D, Schilling NA, Frauhammer F, Miller LS, Nürnberger T, LeibundGut-Landmann S, Gust AA, Macek B, Frank M, Gouttefangeas C, Dela Cruz CS, Hartl D, Weber AN. The fungal ligand chitin directly binds TLR2 and triggers inflammation dependent on oligomer size. EMBO Rep 2018; 19:e46065. [PMID: 30337494 PMCID: PMC6280652 DOI: 10.15252/embr.201846065] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 08/31/2018] [Accepted: 09/10/2018] [Indexed: 12/12/2022] Open
Abstract
Chitin is the second most abundant polysaccharide in nature and linked to fungal infection and asthma. However, bona fide immune receptors directly binding chitin and signaling immune activation and inflammation have not been clearly identified because polymeric crude chitin with unknown purity and molecular composition has been used. By using defined chitin (N-acetyl-glucosamine) oligomers, we here identify six-subunit-long chitin chains as the smallest immunologically active motif and the innate immune receptor Toll-like receptor (TLR2) as a primary fungal chitin sensor on human and murine immune cells. Chitin oligomers directly bind TLR2 with nanomolar affinity, and this fungal TLR2 ligand shows overlapping and distinct signaling outcomes compared to known mycobacterial TLR2 ligands. Unexpectedly, chitin oligomers composed of five or less subunits are inactive, hinting to a size-dependent system of immuno-modulation that appears conserved in plants and humans. Since blocking of the chitin-TLR2 interaction effectively prevents chitin-mediated inflammation in vitro and in vivo, our study highlights the chitin-TLR2 interaction as a potential target for developing novel therapies in chitin-related pathologies and fungal disease.
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Affiliation(s)
- Katharina Fuchs
- Department of Immunology, University of Tübingen, Tübingen, Germany
| | | | - Olaf-Oliver Wolz
- Department of Immunology, University of Tübingen, Tübingen, Germany
| | | | - Lokesh Sharma
- Department of Internal Medicine, Section of Pulmonary, Critical Care and Sleep Medicine, Department of Microbial Pathogenesis, Center for Pulmonary Infection Research and Infection (CPIRT), New Haven, CT, USA
| | - Carly A Dillen
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Christoph Täumer
- Department of Quantitative Proteomics and Proteome Center, University of Tübingen, Tübingen, Germany
| | - Sabine Dickhöfer
- Department of Immunology, University of Tübingen, Tübingen, Germany
| | - Zsofia Bittner
- Department of Immunology, University of Tübingen, Tübingen, Germany
| | - Truong-Minh Dang
- Department of Immunology, University of Tübingen, Tübingen, Germany
| | - Anurag Singh
- University Children's Hospital and Interdisciplinary Center for Infectious Diseases, University of Tübingen, Tübingen, Germany
| | - Daniel Haischer
- Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Maria A Schlöffel
- Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Kirsten J Koymans
- Department of Medical Microbiology, University Medical Center Utrecht, CX Utrecht, The Netherlands
| | | | - Milena Krach
- Department of Immunology, University of Tübingen, Tübingen, Germany
| | - Thierry Roger
- Infectious Diseases Service, Lausanne University Hospital, Epalinges, Switzerland
| | - Didier Le Roy
- Infectious Diseases Service, Lausanne University Hospital, Epalinges, Switzerland
| | - Nadine A Schilling
- Institute of Organic Chemistry, University of Tübingen, Tübingen, Germany
| | - Felix Frauhammer
- Division of Applied Bioinformatics, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Dermatology, Heidelberg University, Heidelberg, Germany
| | - Lloyd S Miller
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Thorsten Nürnberger
- Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | | | - Andrea A Gust
- Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Boris Macek
- Department of Quantitative Proteomics and Proteome Center, University of Tübingen, Tübingen, Germany
| | | | | | - Charles S Dela Cruz
- Department of Internal Medicine, Section of Pulmonary, Critical Care and Sleep Medicine, Department of Microbial Pathogenesis, Center for Pulmonary Infection Research and Infection (CPIRT), New Haven, CT, USA
| | - Dominik Hartl
- University Children's Hospital and Interdisciplinary Center for Infectious Diseases, University of Tübingen, Tübingen, Germany
- Roche Pharma Research & Early Development (pRED), Immunology, Inflammation and Infectious Diseases (I3) Discovery and Translational Area, Roche Innovation Center Basel, Basel, Switzerland
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31
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Carvalho LCR, Queda F, Almeida CV, Filipe SR, Marques MMB. From a Natural Polymer to Relevant NAG‐NAM Precursors. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800592] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Luísa C. R. Carvalho
- LAQV@REQUIMTE, Departamento de Química, Faculdade de Ciências e TecnologiaUniversidade Nova de Lisboa Campus de Caparica 2829-516 Caparica Portugal
| | - Fausto Queda
- LAQV@REQUIMTE, Departamento de Química, Faculdade de Ciências e TecnologiaUniversidade Nova de Lisboa Campus de Caparica 2829-516 Caparica Portugal
| | - Cátia V. Almeida
- LAQV@REQUIMTE, Departamento de Química, Faculdade de Ciências e TecnologiaUniversidade Nova de Lisboa Campus de Caparica 2829-516 Caparica Portugal
| | - Sérgio R. Filipe
- UCIBIO@REQUIMTE, Departamento de Ciências da Vida, Faculdade de Ciências e TecnologiaUniversidade Nova de Lisboa Campus de Caparica 2829-516 Caparica Portugal
- Laboratory of Bacterial Cell Surfaces and Pathogenesis, Instituto de Tecnologia Química e BiológicaUniversidade Nova de Lisboa 2780-157 Oeiras Portugal
| | - M. Manuel B. Marques
- LAQV@REQUIMTE, Departamento de Química, Faculdade de Ciências e TecnologiaUniversidade Nova de Lisboa Campus de Caparica 2829-516 Caparica Portugal
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32
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Zhao S, Wang X, Cai S, Zhang S, Luo H, Wu C, Zhang R, Zhang J. A novel peptidoglycan recognition protein involved in the prophenoloxidase activation system and antimicrobial peptide production in Antheraea pernyi. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2018; 86:78-85. [PMID: 29734021 DOI: 10.1016/j.dci.2018.04.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 04/07/2018] [Accepted: 04/10/2018] [Indexed: 06/08/2023]
Abstract
Pattern recognition receptors (PRRs) are employed in insects to defend against infectious pathogens by triggering various immune responses. Peptidoglycan recognition proteins (PGRPs), a vital family of PRRs, are widely distributed and highly conserved from vertebrates to invertebrates. To date, five PGRP genes have been identified in Antheraea pernyi, but their biochemical roles still remain unknown. In this study, we focused on the immune functions of PGRP-SA in A. pernyi (ApPGRP-SA), which was confirmed to be immune-related according to its significantly up-regulated expression level post microbial injection. In addition, the binding properties of ApPGRP-SA were investigated using a recombinant protein produced in a prokaryotic expression system, revealing that rApPGRP-SA displayed a multi-binding ability to various microbes, including the Gram-positive bacteria Staphylococcus aureus and Micrococcus luteus, Gram-negative bacteria Escherichia coli and Pseudomonas aeruginosa, and fungus Candida albicans, together with their surface pathogen associated molecular patterns (PAMPs). Further studies showed that after recognition, the mixture of rApPGRP-SA/PAMP remarkably stimulated prophenoloxidase (PPO) activation in the hemolymph of A. pernyi in vitro, while the ds-PGRP-SA-treated hemolymph exhibited a lower sensitivity to PAMPs in comparison to the native sample. Moreover, the transcriptional level of the three antimicrobial peptides was also decreased in PGRP-SA knock-down larvae in response to immune-challenge. In summary, we conclude that ApPGRP-SA is a novel identified PGRP in A. pernyi that might act as a broad-spectrum pattern recognition receptor and is involved in the PPO activation system as well as antimicrobial peptide production.
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Affiliation(s)
- Siqi Zhao
- School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, China
| | - Xialu Wang
- School of Medical Devices, Shenyang Pharmaceutical University, China
| | - Siyu Cai
- School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, China
| | - Siqiang Zhang
- School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, China
| | - Hao Luo
- School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, China
| | - Chunfu Wu
- School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, China
| | - Rong Zhang
- School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, China.
| | - Jinghai Zhang
- School of Medical Devices, Shenyang Pharmaceutical University, China.
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33
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Rao XJ, Zhan MY, Pan YM, Liu S, Yang PJ, Yang LL, Yu XQ. Immune functions of insect βGRPs and their potential application. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2018; 83:80-88. [PMID: 29229443 DOI: 10.1016/j.dci.2017.12.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 12/06/2017] [Accepted: 12/08/2017] [Indexed: 06/07/2023]
Abstract
Insects rely completely on the innate immune system to sense the foreign bodies and to mount the immune responses. Germ-line encoded pattern recognition receptors play crucial roles in recognizing pathogen-associated molecular patterns. Among them, β-1,3-glucan recognition proteins (βGRPs) and gram-negative bacteria-binding proteins (GNBPs) belong to the same pattern recognition receptor family, which can recognize β-1,3-glucans. Typical insect βGRPs are comprised of a tandem carbohydrate-binding module in the N-terminal and a glucanase-like domain in the C-terminal. The former can recognize triple-helical β-1,3-glucans, whereas the latter, which normally lacks the enzymatic activity, can recruit adapter proteins to initiate the protease cascade. According to studies, insect βGRPs possess at least three types of functions. Firstly, some βGRPs cooperate with peptidoglycan recognition proteins to recognize the lysine-type peptidoglycans upstream of the Toll pathway. Secondly, some directly recognize fungal β-1,3-glucans to activate the Toll pathway and melanization. Thirdly, some form the 'attack complexes' with other immune effectors to promote the antifungal defenses. The current review will focus on the discovery of insect βGRPs, functions of some well-characterized members, structure-function studies and their potential application.
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Affiliation(s)
- Xiang-Jun Rao
- School of Plant Protection, Anhui Agricultural University, Hefei, Anhui 230036, China.
| | - Ming-Yue Zhan
- School of Plant Protection, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Yue-Min Pan
- School of Plant Protection, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Su Liu
- School of Plant Protection, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Pei-Jin Yang
- School of Plant Protection, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Li-Ling Yang
- School of Plant Protection, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Xiao-Qiang Yu
- Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou 510631, China
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34
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Emery O, Schmidt K, Engel P. Immune system stimulation by the gut symbiont Frischella perrara in the honey bee (Apis mellifera). Mol Ecol 2017; 26:2576-2590. [PMID: 28207182 DOI: 10.1111/mec.14058] [Citation(s) in RCA: 103] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 02/01/2017] [Accepted: 02/02/2017] [Indexed: 12/24/2022]
Abstract
Gut bacteria engage in various symbiotic interactions with their host and impact gut immunity and homeostasis in different ways. In honey bees, the gut microbiota is composed of a relatively simple, but highly specialized bacterial community. One of its members, the gammaproteobacterium Frischella perrara induces the so-called scab phenotype, a dark-coloured band that develops on the epithelial surface of the pylorus. To understand the underlying host response, we analysed transcriptome changes in the pylorus in response to bacterial colonization. We find that, in contrast to the gut bacterium Snodgrassella alvi, F. perrara causes strong activation of the host immune system. Besides pattern recognition receptors, antimicrobial peptides and transporter genes, the melanization cascade was upregulated by F. perrara, suggesting that the scab phenotype corresponds to a melanization response of the host. In addition, transcriptome analysis of hive bees with and without the scab phenotype showed that F. perrara also stimulates the immune system under in-hive conditions in the presence of other gut bacterial species. Collectively, our study demonstrates that the presence of F. perrara influences gut immunity and homeostasis in the pylorus. This may have implications for bee health, because F. perrara prevalence differs between colonies and increased abundance of this bacterium has been shown to correlate with dietary alteration and impaired host development. Our transcriptome analysis sets the groundwork for investigating the interplay of bee gut symbionts with the host immune system.
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Affiliation(s)
- Olivier Emery
- Department of Fundamental Microbiology, University of Lausanne, CH-1015, Lausanne, Switzerland
| | - Konstantin Schmidt
- Department of Fundamental Microbiology, University of Lausanne, CH-1015, Lausanne, Switzerland
| | - Philipp Engel
- Department of Fundamental Microbiology, University of Lausanne, CH-1015, Lausanne, Switzerland
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Wang ZZ, Shi M, Huang YC, Wang XW, Stanley D, Chen XX. A peptidoglycan recognition protein acts in whitefly (Bemisia tabaci) immunity and involves in Begomovirus acquisition. Sci Rep 2016; 6:37806. [PMID: 27892529 PMCID: PMC5124967 DOI: 10.1038/srep37806] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 11/02/2016] [Indexed: 11/09/2022] Open
Abstract
Peptidoglycan recognition proteins (PGRPs) are multifunctional pattern recognition proteins. Here, we report that a PGRP gene, BtPGRP, encodes a PGRP from the whitefly Bemisia tabaci (MEAM1) that binds and kills bacteria in vitro. We analyzed BtPGRP transcriptional profiling, and the distribution of the cognate protein within the midgut. Fungal infection and wasp parasitization induced expression of BtPGRP. Silencing BtPGRP with artificial media amended with dsRNA led to reduced expression of a gene encoding an antimicrobial peptide, B. tabaci c-type lysozyme. Begomovirus infection also led to increased expression of BtPGRP. We propose that BtPGRP has a potential Tomato yellow leaf curl virus (TYLCV) binding site because we detected in vitro interaction between BtPGRP and TYLCV by immunocapture PCR, and recorded the co-localization of TYLCV and BtPGRP in midguts. This work addresses a visible gap in understanding whitefly immunity and provides insight into how the whitefly immunity acts in complex mechanisms of Begomovirus transmission among plants.
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Affiliation(s)
- Zhi-Zhi Wang
- Ministry of Agriculture Key Lab of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Min Shi
- Ministry of Agriculture Key Lab of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Yi-Cun Huang
- Ministry of Agriculture Key Lab of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Xiao-Wei Wang
- Ministry of Agriculture Key Lab of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - David Stanley
- Biological Control of Insects Research Laboratory, Agricultural Research Service, U.S., Department of Agriculture, 1503 S. Providence Road, Columbia MO 65203, USA
| | - Xue-Xin Chen
- Ministry of Agriculture Key Lab of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
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Capo F, Charroux B, Royet J. Bacteria sensing mechanisms in Drosophila gut: Local and systemic consequences. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2016; 64:11-21. [PMID: 26778296 DOI: 10.1016/j.dci.2016.01.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 01/05/2016] [Accepted: 01/07/2016] [Indexed: 06/05/2023]
Abstract
All insects are colonized by microorganisms on their exoskeleton, their gut and even in some cases within their own somatic and germ line cells. This microbiota that can represent up to a few percent of the insect biomass may have a pervasive impact on many aspects of insect biology including physiology, nutrient acquisition, ageing, behaviour and resistance to infection. Mainly through ingestion of contaminated food, the mouth-gut axis represents the first and principal access of external bacteria to the host. Soon after ingestion, the feeding insect needs to rapidly and accurately identify the ingested microbes and decide whether to preserve them if beneficial or neutral, or to eliminate them if potentially harmful. We will review here the recent data acquired in Drosophila on the mechanisms that invertebrate enterocytes rely on to detect the presence of bacteria in the gut. We will compare these modes of bacteria sensing to those in other immune competent tissues and try to rationalize differences that may exist. We will also analyse the physiological consequences of bacteria detection not only locally for the gut itself but also for remote tissues. Finally, we will describe the physiological disorders that can occur due to inaccurate bacteria identification by the gut epithelium.
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Affiliation(s)
- Florence Capo
- Aix Marseille Université, CNRS, IBDM UMR 7288, 13288, Marseille, France
| | - Bernard Charroux
- Aix Marseille Université, CNRS, IBDM UMR 7288, 13288, Marseille, France
| | - Julien Royet
- Aix Marseille Université, CNRS, IBDM UMR 7288, 13288, Marseille, France.
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Wu S, Zhu X, Liu Z, Shao E, Rebeca CL, Guo Y, Xiong Y, Mou Y, Xu R, Hu X, Liang G, Zou S, Guan X, Zhang F. Identification of Genes Relevant to Pesticides and Biology from Global Transcriptome Data of Monochamus alternatus Hope (Coleoptera: Cerambycidae) Larvae. PLoS One 2016; 11:e0147855. [PMID: 26815657 PMCID: PMC4729689 DOI: 10.1371/journal.pone.0147855] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Accepted: 01/08/2016] [Indexed: 12/13/2022] Open
Abstract
Monochamus alternatus Hope is the main vector in China of the Pine Wilt Disease caused by the pine wood nematode Bursaphelenchus xylophilus. Although chemical control is traditionally used to prevent pine wilt disease, new strategies based in biological control are promising ways for the management of the disease. However, there is no deep sequence analysis of Monochamus alternatus Hope that describes the transcriptome and no information is available about gene function of this insect vector. We used next generation sequencing technology to sequence the whole fourth instar larva transcriptome of Monochamus alternatus Hope and successfully built a Monochamus alternatus Hope transcriptome database. In total, 105,612 unigenes were assigned for Gene Ontology (GO) terms, information for 16,730 classified unigenes was obtained in the Clusters of Orthologous Groups (COGs) database, and 13,024 unigenes matched with 224 predicted pathways in the Kyoto Encyclopedia of Genes and Genome (KEGG). In addition, genes related to putative insecticide resistance-related genes, RNAi, the Bt receptor, intestinal digestive enzymes, possible future insect control targets and immune-related molecules are described. This study provides valuable basic information that can be used as a gateway to develop new molecular tools for Monochamus alternatus Hope control strategies.
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Affiliation(s)
- Songqing Wu
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- Fujian-Taiwan Joint Center for Ecological Control of Crop Pests, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Xiaoli Zhu
- Fujian-Taiwan Joint Center for Ecological Control of Crop Pests, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Zhaoxia Liu
- Fujian-Taiwan Joint Center for Ecological Control of Crop Pests, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Ensi Shao
- Fujian-Taiwan Joint Center for Ecological Control of Crop Pests, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Carballar-Lejarazú Rebeca
- Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA, 92697, United States of America
| | - Yajie Guo
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Yueting Xiong
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- Fujian-Taiwan Joint Center for Ecological Control of Crop Pests, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Yani Mou
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- Fujian-Taiwan Joint Center for Ecological Control of Crop Pests, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Runxue Xu
- Fujian-Taiwan Joint Center for Ecological Control of Crop Pests, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Xia Hu
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Guanghong Liang
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Shuangquan Zou
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
| | - Xiong Guan
- Fujian-Taiwan Joint Center for Ecological Control of Crop Pests, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- * E-mail: (FPZ); (XG)
| | - Feiping Zhang
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China
- * E-mail: (FPZ); (XG)
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Koyama H, Kato D, Minakuchi C, Tanaka T, Yokoi K, Miura K. Peptidoglycan recognition protein genes and their roles in the innate immune pathways of the red flour beetle, Tribolium castaneum. J Invertebr Pathol 2015; 132:86-100. [PMID: 26385528 DOI: 10.1016/j.jip.2015.09.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2015] [Revised: 08/11/2015] [Accepted: 09/15/2015] [Indexed: 01/09/2023]
Abstract
We have previously demonstrated that the functional Toll and IMD innate immune pathways indeed exist in the model beetle, Tribolium castaneum while the beetle's pathways have broader specificity in terms of microbial activation than that of Drosophila. To elucidate the molecular basis of this broad microbial activation, we here focused on potential upstream sensors of the T. castaneum innate immune pathways, peptidoglycan recognition proteins (PGRPs). Our phenotype analyses utilizing RNA interference-based comprehensive gene knockdown followed by bacterial challenge suggested: PGRP-LA functions as a pivotal sensor of the IMD pathway for both Gram-negative and Gram-positive bacteria; PGRP-LC acts as an IMD pathway-associated sensor mainly for Gram-negative bacteria; PGRP-LE also has some roles in Gram-negative bacterial recognition of the IMD pathway. On the other hand, we did not obtain clear phenotype changes by gene knockdown of short-type PGRP genes, probably because of highly inducible nature of these genes. Our results may collectively account for the promiscuous bacterial activation of the T. castaneum innate immune pathways at least in part.
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Affiliation(s)
- Hiroaki Koyama
- Applied Entomology Laboratory, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Daiki Kato
- Applied Entomology Laboratory, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Chieka Minakuchi
- Applied Entomology Laboratory, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Toshiharu Tanaka
- Applied Entomology Laboratory, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Kakeru Yokoi
- Applied Entomology Laboratory, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Ken Miura
- Applied Entomology Laboratory, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan.
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Gerdol M, Venier P. An updated molecular basis for mussel immunity. FISH & SHELLFISH IMMUNOLOGY 2015; 46:17-38. [PMID: 25700785 DOI: 10.1016/j.fsi.2015.02.013] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Revised: 02/02/2015] [Accepted: 02/09/2015] [Indexed: 06/04/2023]
Abstract
Non-self recognition with the consequent tolerance or immune reaction is a crucial process to succeed as living organisms. At the same time the interactions between host species and their microbiome, including potential pathogens and parasites, significantly contribute to animal life diversity. Marine filter-feeding bivalves, mussels in particular, can survive also in heavily anthropized coastal waters despite being constantly surrounded by microorganisms. Based on the first outline of the Mytilus galloprovincialis immunome dated 2011, the continuously growing transcript data and the recent release of a draft mussel genome, we explored the available sequence data and scientific literature to reinforce our knowledge on the main gene-encoded elements of the mussel immune responses, from the pathogen recognition to its clearance. We carefully investigated molecules specialized in the sensing and targeting of potential aggressors, expected to show greater molecular diversification, and outlined, whenever relevant, the interconnected cascades of the intracellular signal transduction. Aiming to explore the diversity of extracellular, membrane-bound and intracellular pattern recognition receptors in mussel, we updated a highly complex immune system, comprising molecules which are described here in detail for the first time (e.g. NOD-like receptors) or which had only been partially characterized in bivalves (e.g. RIG-like receptors). Overall, our comparative sequence analysis supported the identification of over 70 novel full-length immunity-related transcripts in M. galloprovincialis. Nevertheless, the multiplicity of gene functions relevant to immunity, the involvement of part of them in other vital processes, and also the lack of a refined mussel genome make this work still not-exhaustive and support the development of more specific studies.
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Affiliation(s)
- Marco Gerdol
- Department of Life Sciences, University of Trieste, Via L. Giorgeri 5, 34127 Trieste, Italy.
| | - Paola Venier
- Department of Biology, University of Padua, Via U. Bassi 58/b, 35131 Padua, Italy.
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40
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Pulpitel T, Pernice M, Simpson SJ, Ponton F. Tissue-Specific Immune Gene Expression in the Migratory Locust, Locusta Migratoria. INSECTS 2015; 6:368-80. [PMID: 26463191 PMCID: PMC4553485 DOI: 10.3390/insects6020368] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 04/02/2015] [Accepted: 04/08/2015] [Indexed: 11/16/2022]
Abstract
The ability of hosts to respond to infection involves several complex immune recognition pathways. Broadly conserved pathogen-associated molecular patterns (PAMPs) allow individuals to target a range of invading microbes. Recently, studies on insect innate immunity have found evidence that a single pathogen can activate different immune pathways across species. In this study, expression changes in immune genes encoding peptidoglycan-recognition protein SA (PGRP-SA), gram-negative binding protein 1 (GNBP1) and prophenoloxidase (ProPO) were investigated in Locusta migratoria, following an immune challenge using injected lipopolysaccharide (LPS) solution from Escherichia coli. Since immune activation might also be tissue-specific, gene expression levels were followed across a range of tissue types. For PGRP-SA, expression increased in response to LPS within all seven of the tissue-types assayed and differed significantly between tissues. Expression of GNBP1 similarly varied across tissue types, yet showed no clear expression difference between LPS-injected and uninfected locusts. Increases in ProPO expression in response to LPS, however, could only be detected in the gut sections. This study has revealed tissue-specific immune response to add a new level of complexity to insect immune studies. In addition to variation in recognition pathways identified in previous works, tissue-specificity should be carefully considered in similar works.
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Affiliation(s)
- Tamara Pulpitel
- School of Biological Sciences, The University of Sydney, NSW 2006, Australia.
| | - Mathieu Pernice
- Plant Functional Biology and Climate Change Cluster, University of Technology Sydney, New South Wales 2007, Australia.
| | - Stephen J Simpson
- School of Biological Sciences, The University of Sydney, NSW 2006, Australia.
- The Charles Perkins Centre, The University of Sydney, NSW 2006, Australia.
| | - Fleur Ponton
- School of Biological Sciences, The University of Sydney, NSW 2006, Australia.
- The Charles Perkins Centre, The University of Sydney, NSW 2006, Australia.
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41
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Buckley KM, Rast JP. Diversity of animal immune receptors and the origins of recognition complexity in the deuterostomes. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2015; 49:179-189. [PMID: 25450907 DOI: 10.1016/j.dci.2014.10.013] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 10/01/2014] [Accepted: 10/20/2014] [Indexed: 06/04/2023]
Abstract
Invertebrate animals are characterized by extraordinary diversity in terms of body plan, life history and life span. The past impression that invertebrate immune responses are controlled by relatively simple innate systems is increasingly contradicted by genomic analyses that reveal significant evolutionary novelty and complexity. One accessible measure of this complexity is the multiplicity of genes encoding homologs of pattern recognition receptors. These multigene families vary significantly in size, and their sequence character suggests that they vary in function. At the same time, certain aspects of downstream signaling appear to be conserved. Here, we analyze five major classes of immune recognition receptors from newly available animal genome sequences. These include the Toll-like receptors (TLR), Nod-like receptors (NLR), SRCR domain scavenger receptors, peptidoglycan recognition proteins (PGRP), and Gram negative binding proteins (GNBP). We discuss innate immune complexity in the invertebrate deuterostomes, which was first recognized in sea urchins, within the wider context of emerging genomic information across animal phyla.
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MESH Headings
- Animals
- Biodiversity
- Evolution, Molecular
- Genetic Variation
- Genome/genetics
- Immunity, Innate/genetics
- Immunity, Innate/immunology
- Invertebrates/classification
- Invertebrates/genetics
- Invertebrates/immunology
- Multigene Family/genetics
- Multigene Family/immunology
- Phylogeny
- Receptors, Immunologic/classification
- Receptors, Immunologic/genetics
- Receptors, Immunologic/immunology
- Receptors, Pattern Recognition/genetics
- Receptors, Pattern Recognition/immunology
- Receptors, Scavenger/genetics
- Receptors, Scavenger/immunology
- Species Specificity
- Toll-Like Receptors/genetics
- Toll-Like Receptors/immunology
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Affiliation(s)
- Katherine M Buckley
- Department of Immunology and Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada; Sunnybrook Research Institute, Toronto, ON, Canada.
| | - Jonathan P Rast
- Department of Immunology and Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada; Sunnybrook Research Institute, Toronto, ON, Canada
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Stokes BA, Yadav S, Shokal U, Smith LC, Eleftherianos I. Bacterial and fungal pattern recognition receptors in homologous innate signaling pathways of insects and mammals. Front Microbiol 2015; 6:19. [PMID: 25674081 PMCID: PMC4309185 DOI: 10.3389/fmicb.2015.00019] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 01/07/2015] [Indexed: 12/12/2022] Open
Abstract
In response to bacterial and fungal infections in insects and mammals, distinct families of innate immune pattern recognition receptors (PRRs) initiate highly complex intracellular signaling cascades. Those cascades induce a variety of immune functions that restrain the spread of microbes in the host. Insect and mammalian innate immune receptors include molecules that recognize conserved microbial molecular patterns. Innate immune recognition leads to the recruitment of adaptor molecules forming multi-protein complexes that include kinases, transcription factors, and other regulatory molecules. Innate immune signaling cascades induce the expression of genes encoding antimicrobial peptides and other key factors that mount and regulate the immune response against microbial challenge. In this review, we summarize our current understanding of the bacterial and fungal PRRs for homologous innate signaling pathways of insects and mammals in an effort to provide a framework for future studies.
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Affiliation(s)
- Bethany A Stokes
- Insect Infection and Immunity Laboratory, Department of Biological Sciences, The George Washington University Washington, DC, USA
| | - Shruti Yadav
- Insect Infection and Immunity Laboratory, Department of Biological Sciences, The George Washington University Washington, DC, USA
| | - Upasana Shokal
- Insect Infection and Immunity Laboratory, Department of Biological Sciences, The George Washington University Washington, DC, USA
| | - L C Smith
- Insect Infection and Immunity Laboratory, Department of Biological Sciences, The George Washington University Washington, DC, USA
| | - Ioannis Eleftherianos
- Insect Infection and Immunity Laboratory, Department of Biological Sciences, The George Washington University Washington, DC, USA
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43
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Bertsche U, Mayer C, Götz F, Gust AA. Peptidoglycan perception--sensing bacteria by their common envelope structure. Int J Med Microbiol 2014; 305:217-23. [PMID: 25596887 DOI: 10.1016/j.ijmm.2014.12.019] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Most Eubacteria possess peptidoglycan (PGN) or murein that surrounds the cytoplasmic membrane. While on the one hand this PGN sacculus is a very protective shield that provides resistance to the internal turgor and adverse effects of the environment, it serves on the other hand as a major pattern of recognition due to its unique structure. Eukaryotes harness this particular bacterial macromolecule to perceive (pathogenic) microorganisms and initiate their immune defence. PGN fragments are generated by bacteria as turnover products during bacterial cell wall growth and these fragments can be sensed by plants and animals to assess a potential bacterial threat. To increase the sensitivity the concentration of PGN fragments can be amplified by host hydrolytic enzymes such as lysozyme or amidase. But also bacteria themselves are able to perceive information about the state of their cell wall by sensing small soluble fragments released from its PGN, which eventually leads to the induction of antibiotic responses or cell differentiation. How PGN is sensed by bacteria, plants and animals, and how the antibacterial defence is modulated by PGN perception is the issue of this review.
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Affiliation(s)
- Ute Bertsche
- Microbial Genetics, Interfaculty Institute for Microbiology and Infection Medicine Tübingen (IMIT), University of Tübingen, 72076 Tübingen, Germany
| | - Christoph Mayer
- Microbiology/Biotechnology, Interfaculty Institute for Microbiology and Infection Medicine Tübingen (IMIT), University of Tübingen, 72076 Tübingen, Germany
| | - Friedrich Götz
- Microbial Genetics, Interfaculty Institute for Microbiology and Infection Medicine Tübingen (IMIT), University of Tübingen, 72076 Tübingen, Germany
| | - Andrea A Gust
- Plant Biochemistry, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany.
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Gao K, Deng XY, Qian HY, Qin GX, Hou CX, Guo XJ. Cloning and expression analysis of a peptidoglycan recognition protein in silkworm related to virus infection. Gene 2014; 552:24-31. [DOI: 10.1016/j.gene.2014.09.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Revised: 08/21/2014] [Accepted: 09/02/2014] [Indexed: 01/06/2023]
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45
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Liu X, Grabherr HM, Willmann R, Kolb D, Brunner F, Bertsche U, Kühner D, Franz-Wachtel M, Amin B, Felix G, Ongena M, Nürnberger T, Gust AA. Host-induced bacterial cell wall decomposition mediates pattern-triggered immunity in Arabidopsis. eLife 2014; 3:e01990. [PMID: 24957336 PMCID: PMC4103680 DOI: 10.7554/elife.01990] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 06/20/2014] [Indexed: 12/22/2022] Open
Abstract
Peptidoglycans (PGNs) are immunogenic bacterial surface patterns that trigger immune activation in metazoans and plants. It is generally unknown how complex bacterial structures such as PGNs are perceived by plant pattern recognition receptors (PRRs) and whether host hydrolytic activities facilitate decomposition of bacterial matrices and generation of soluble PRR ligands. Here we show that Arabidopsis thaliana, upon bacterial infection or exposure to microbial patterns, produces a metazoan lysozyme-like hydrolase (lysozyme 1, LYS1). LYS1 activity releases soluble PGN fragments from insoluble bacterial cell walls and cleavage products are able to trigger responses typically associated with plant immunity. Importantly, LYS1 mutant genotypes exhibit super-susceptibility to bacterial infections similar to that observed on PGN receptor mutants. We propose that plants employ hydrolytic activities for the decomposition of complex bacterial structures, and that soluble pattern generation might aid PRR-mediated immune activation in cell layers adjacent to infection sites.
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Affiliation(s)
- Xiaokun Liu
- Department of Plant Biochemistry, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Heini M Grabherr
- Department of Plant Biochemistry, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Roland Willmann
- Department of Plant Biochemistry, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Dagmar Kolb
- Department of Plant Biochemistry, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Frédéric Brunner
- Department of Plant Biochemistry, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Ute Bertsche
- Department of Microbial Genetics, University of Tübingen, Tübingen, Germany
| | - Daniel Kühner
- Department of Microbial Genetics, University of Tübingen, Tübingen, Germany
| | | | - Bushra Amin
- Medical and Natural Sciences Research Centre, University of Tübingen, Tübingen, Germany
| | - Georg Felix
- Department of Plant Biochemistry, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Marc Ongena
- Wallon Centre for Industrial Biology, University of Liege-Gembloux Agro-Bio Tech, Gembloux, Belgium
| | - Thorsten Nürnberger
- Department of Plant Biochemistry, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Andrea A Gust
- Department of Plant Biochemistry, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
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46
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Kurata S. Peptidoglycan recognition proteins in Drosophila immunity. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2014; 42:36-41. [PMID: 23796791 PMCID: PMC3808481 DOI: 10.1016/j.dci.2013.06.006] [Citation(s) in RCA: 152] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 06/11/2013] [Accepted: 06/11/2013] [Indexed: 05/13/2023]
Abstract
Innate immunity is the front line of self-defense against infectious non-self in vertebrates and invertebrates. The innate immune system is mediated by germ-line encoding pattern recognition molecules (pathogen sensors) that recognize conserved molecular patterns present in the pathogens but absent in the host. Peptidoglycans (PGN) are essential cell wall components of almost all bacteria, except mycoplasma lacking a cell wall, which provides the host immune system an advantage for detecting invading bacteria. Several families of pattern recognition molecules that detect PGN and PGN-derived compounds have been indentified, and the role of PGRP family members in host defense is relatively well-characterized in Drosophila. This review focuses on the role of PGRP family members in the recognition of invading bacteria and the activation and modulation of immune responses in Drosophila.
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Affiliation(s)
- Shoichiro Kurata
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai 980-8578, Japan.
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Kounatidis I, Ligoxygakis P. Drosophila as a model system to unravel the layers of innate immunity to infection. Open Biol 2013; 2:120075. [PMID: 22724070 PMCID: PMC3376734 DOI: 10.1098/rsob.120075] [Citation(s) in RCA: 138] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Accepted: 04/25/2012] [Indexed: 12/11/2022] Open
Abstract
Innate immunity relies entirely upon germ-line encoded receptors, signalling components and effector molecules for the recognition and elimination of invading pathogens. The fruit fly Drosophila melanogaster with its powerful collection of genetic and genomic tools has been the model of choice to develop ideas about innate immunity and host–pathogen interactions. Here, we review current research in the field, encompassing all layers of defence from the role of the microbiota to systemic immune activation, and attempt to speculate on future directions and open questions.
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Affiliation(s)
- Ilias Kounatidis
- Laboratory of Genes and Development, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
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Nayduch D, Cho H, Joyner C. Staphylococcus aureus in the house fly: temporospatial fate of bacteria and expression of the antimicrobial peptide defensin. JOURNAL OF MEDICAL ENTOMOLOGY 2013; 50:171-8. [PMID: 23427667 PMCID: PMC3767466 DOI: 10.1603/me12189] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
House flies disseminate numerous species of bacteria acquired during feeding and breeding activities in microbe-rich habitats. Previous house fly surveys have detected the pathogen Staphylococcus aureus Rosenbach 1884, which causes cutaneous and septic infections in mammals, and enterotoxic food poisoning. We assessed the fate of GFP-expressing S. aureus (GFP-S. aureus) in the house fly alimentary canal with microscopy and by culture of whole flies and excreta. Furthermore, the concurrent expression of the antimicrobial peptide gene defensin was measured in the crop, proventriculus, midgut, and fat body. As soon as 4 h postingestion (PI), GFP-S. aureus were visualized as cocci or diplococci in the hindgut and rectum of flies fed approximately equal 10(5) colony forming units. Bacteria persisted up to 6 h PI but significantly decreased. Excretion of viable GFP-S. aureus peaked at 2 h PI and, although significantly less, continued up to 4 h PI. defensin was highly upregulated locally in the alimentary canal and systemically in fat body at 2, 4, and 6 h PI making this study the first to report, to our knowledge, an epithelial and systemic response to a bacterium with lysine-type peptidoglycan in flies exposed via feeding. While flies harbored S. aureus for up to 6 h PI, the highest probability of vectoring biologically relevant amounts of bacteria occurred 0-2 h PI. The combined effects of excretion, digestion and antimicrobial effectors likely contribute to loss of ingested bacteria. Nonetheless, house flies are relevant vectors for S. aureus up to 2 h PI and environmental reservoirs up to 6 h PI.
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Affiliation(s)
- Dana Nayduch
- Department of Biology, Georgia Southern University, 69 Georgia Avenue, Statesboro, GA 30460, USA.
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Ligoxygakis P. Genetics of Immune Recognition and Response in Drosophila host defense. ADVANCES IN GENETICS 2013; 83:71-97. [DOI: 10.1016/b978-0-12-407675-4.00002-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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valli JS, Vaseeharan B. cDNA cloning, characterization and expression of lipopolysaccharide and β-1,3-glucan binding protein (LGBP) gene from the Indian white shrimp Fenneropenaeus indicus. Comp Biochem Physiol A Mol Integr Physiol 2012; 163:74-81. [DOI: 10.1016/j.cbpa.2012.05.185] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Revised: 05/09/2012] [Accepted: 05/13/2012] [Indexed: 10/28/2022]
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