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Hu Y, Kong F, Guo H, Hua Y, Zhu Y, Zhang C, Qadeer A, Xiao Y, Cai Q, Ji S. Drosophila eIF3f1 mediates host immune defense by targeting dTak1. EMBO Rep 2024; 25:1415-1435. [PMID: 38279019 PMCID: PMC10933477 DOI: 10.1038/s44319-024-00067-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 01/28/2024] Open
Abstract
Eukaryotic translation initiation factors have long been recognized for their critical roles in governing the translation of coding RNAs into peptides/proteins. However, whether they harbor functional activities at the post-translational level remains poorly understood. Here, we demonstrate that eIF3f1 (eukaryotic translation initiation factor 3 subunit f1), which encodes an archetypal deubiquitinase, is essential for the antimicrobial innate immune defense of Drosophila melanogaster. Our in vitro and in vivo evidence indicate that the immunological function of eIF3f1 is dependent on the N-terminal JAMM (JAB1/MPN/Mov34 metalloenzymes) domain. Mechanistically, eIF3f1 physically associates with dTak1 (Drosophila TGF-beta activating kinase 1), a key regulator of the IMD (immune deficiency) signaling pathway, and mediates the turnover of dTak1 by specifically restricting its K48-linked ubiquitination. Collectively, these results provide compelling insight into a noncanonical molecular function of a translation initiation factor that controls the post-translational modification of a target protein.
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Affiliation(s)
- Yixuan Hu
- Center for Developmental Biology, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
- Institutes of Brain Science, Wannan Medical College, 241002, Wuhu, Anhui, China
| | - Fanrui Kong
- Center for Developmental Biology, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
- Anhui Province Key Laboratory of Resource Insect Biology and Innovative Utilization, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
| | - Huimin Guo
- Center for Developmental Biology, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
- Center for Biological Technology, Anhui Agricultural University, 230036, Hefei, Anhui, China
| | - Yongzhi Hua
- Center for Developmental Biology, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
| | - Yangyang Zhu
- Center for Developmental Biology, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
- Anhui Province Key Laboratory of Resource Insect Biology and Innovative Utilization, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
| | - Chuchu Zhang
- Center for Developmental Biology, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
- Anhui Province Key Laboratory of Resource Insect Biology and Innovative Utilization, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
| | - Abdul Qadeer
- Center for Developmental Biology, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
- Anhui Province Key Laboratory of Resource Insect Biology and Innovative Utilization, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
| | - Yihua Xiao
- Center for Developmental Biology, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
- Anhui Province Key Laboratory of Resource Insect Biology and Innovative Utilization, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China
| | - Qingshuang Cai
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, 67400, France.
| | - Shanming Ji
- Center for Developmental Biology, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China.
- Anhui Province Key Laboratory of Resource Insect Biology and Innovative Utilization, School of Life Sciences, Anhui Agricultural University, 230036, Hefei, Anhui, China.
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Xu X, Foley E. Vibrio cholerae arrests intestinal epithelial proliferation through T6SS-dependent activation of the bone morphogenetic protein pathway. Cell Rep 2024; 43:113750. [PMID: 38340318 DOI: 10.1016/j.celrep.2024.113750] [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: 07/05/2023] [Revised: 12/19/2023] [Accepted: 01/22/2024] [Indexed: 02/12/2024] Open
Abstract
To maintain an effective barrier, intestinal progenitor cells must divide at a rate that matches the loss of dead and dying cells. Otherwise, epithelial breaches expose the host to systemic infection by gut-resident microbes. Unlike most pathogens, Vibrio cholerae blocks tissue repair by arresting progenitor proliferation in the Drosophila model. At present, we do not understand how V. cholerae circumvents such a critical antibacterial defense. We find that V. cholerae blocks epithelial repair by activating the growth inhibitor bone morphogenetic protein (BMP) pathway in progenitors. Specifically, we show that interactions between V. cholerae and gut commensals initiate BMP signaling via host innate immune defenses. Notably, we find that V. cholerae also activates BMP and arrests proliferation in zebrafish intestines, indicating an evolutionarily conserved link between infection and failure in tissue repair. Our study highlights how enteric pathogens engage host immune and growth regulatory pathways to disrupt intestinal epithelial repair.
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Affiliation(s)
- Xinyue Xu
- Department of Medical Microbiology and Immunology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB T6G 2E1, Canada
| | - Edan Foley
- Department of Medical Microbiology and Immunology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB T6G 2E1, Canada; Department of Cell Biology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB T6G 2H7, Canada.
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3
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Gauthier AE, Rotjan RD, Kagan JC. Lipopolysaccharide detection by the innate immune system may be an uncommon defence strategy used in nature. Open Biol 2022; 12:220146. [PMID: 36196535 PMCID: PMC9533005 DOI: 10.1098/rsob.220146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 09/09/2022] [Indexed: 11/12/2022] Open
Abstract
Since the publication of the Janeway's Pattern Recognition hypothesis in 1989, study of pathogen-associated molecular patterns (PAMPs) and their immuno-stimulatory activities has accelerated. Most studies in this area have been conducted in model organisms, which leaves many open questions about the universality of PAMP biology across living systems. Mammals have evolved multiple proteins that operate as receptors for the PAMP lipopolysaccharide (LPS) from Gram-negative bacteria, but LPS is not immuno-stimulatory in all eukaryotes. In this review, we examine the history of LPS as a PAMP in mammals, recent data on LPS structure and its ability to activate mammalian innate immune receptors, and how these activities compare across commonly studied eukaryotes. We discuss why LPS may have evolved to be immuno-stimulatory in some eukaryotes but not others and propose two hypotheses about the evolution of PAMP structure based on the ecology and environmental context of the organism in question. Understanding PAMP structures and stimulatory mechanisms across multi-cellular life will provide insights into the evolutionary origins of innate immunity and may lead to the discovery of new PAMP variations of scientific and therapeutic interest.
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Affiliation(s)
- Anna E. Gauthier
- Division of Gastroenterology, Boston Children's Hospital and Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA
- Program in Virology, Harvard Medical School, Boston, MA, USA
| | - Randi D. Rotjan
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Jonathan C. Kagan
- Division of Gastroenterology, Boston Children's Hospital and Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA
- Harvard Medical School, and Boston Children's Hospital, Division of Immunology, Division of Gastroenterology, USA
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Molecular and Functional Characterization of a Short-Type Peptidoglycan Recognition Protein, Ct-PGRP-S1 in the Giant Triton Snail Charonia tritonis. Int J Mol Sci 2022; 23:ijms231911062. [PMID: 36232364 PMCID: PMC9570181 DOI: 10.3390/ijms231911062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/15/2022] [Accepted: 09/17/2022] [Indexed: 11/22/2022] Open
Abstract
Peptidoglycan recognition proteins (PGRPs) are a family of pattern recognition receptors (PRRs) involved in host antibacterial responses, and their functions have been characterized in most invertebrate and vertebrate animals. However, little information is available regarding the potential function of PGRPs in the giant triton snail Charonia tritonis. In this study, a short-type PGRP gene (termed Ct-PGRP-S1) was identified in C. tritonis. Ct-PGRP-S1 was predicted to contain several structural features known in PGRPs, including a typical PGRP domain (Amidase_2) and Src homology-3 (SH3) domain. The Ct-PGRP-S1 gene was constitutively expressed in all tissues examined except in proboscis, with the highest expression level observed in the liver. As a typical PRR, Ct-PGRP-S1 has an ability to degrade peptidoglycan (PGN) and was proven to have non-Zn2+-dependent amidase activity and antibacterial activity against Vibrioalginolyticus and Staphylococcus aureus. It is the first report to reveal the peptidoglycan recognition protein in C. tritonis, and these results suggest that peptidoglycan recognition protein Ct-PGRP-S1 is an important effector of C. tritonis that modulates bacterial infection resistance of V. alginolyticus and S. aureus, and this study may provide crucial basic data for the understanding of an innate immunity system of C. tritonis.
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Jin Y, Li L, Li JH, Nie P. Identification of PGRP2 and its three splice variants in grass carp Ctenopharyngodon idella. FISH & SHELLFISH IMMUNOLOGY 2022; 127:933-938. [PMID: 35863538 DOI: 10.1016/j.fsi.2022.07.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/14/2022] [Accepted: 07/14/2022] [Indexed: 06/15/2023]
Abstract
In this study, peptidoglycan recognition protein 2 (PGRP2) gene was cloned in grass carp Ctenopharyngodon idella, with the open reading frame (ORF) of PGRP2 being 1452 bp, encoding a protein of 483 amino acids. Three splice variants, PGRP2a, PGRP2b, and PGRP2c, were found also in grass carp with the absence of entire exon two and partial exon two of the PGRP2, and were predicted to have 124, 371 and 311 amino acids. But, they all have PGRP domain and signal peptide, except PGRP2a. The PGRP2 and its variants were expressed in all organs/tissues examined, and stimulated following PGN injection. It is further detected that the expression of gcPGRP2 and its variants was up-regulated after the single transfection of each of gcPGRP2 and its variant expression plasmids in CO cells. It is considered that the cloning of PGRP2 in grass carp provides a compositional completeness of PGRP members in this fish with the inclusion of previously reported PGRP5 and PGRP6.
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Affiliation(s)
- Yong Jin
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Li Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Jun Hua Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Pin Nie
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China; School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China.
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6
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Jang HA, Kojour MAM, Patnaik BB, Han YS, Jo YH. Current Status of Immune Deficiency Pathway in Tenebrio molitor Innate Immunity. Front Immunol 2022; 13:906192. [PMID: 35860244 PMCID: PMC9292131 DOI: 10.3389/fimmu.2022.906192] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 06/16/2022] [Indexed: 11/13/2022] Open
Abstract
Yellow mealworm (Tenebrio molitor) is a highly beneficial beetle that serves as an excellent source of edible protein as well as a practical study model. Therefore, studying its immune system is important. Like in other insects, the innate immune response effected through antimicrobial peptides production provides the most critical defense armory in T. molitor. Immune deficiency (Imd) signaling is one of the major pathways involved in the humoral innate immune response in this beetle. However, the nature of the molecules involved in the signaling cascade of the Imd pathway, from recognition to the production of final effectors, and their mechanism of action are yet to be elucidated in T. molitor model. In this review, we present a general overview of the current literature available on the Imd signaling pathway and its identified interaction partners in T. molitor.
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Affiliation(s)
- Ho Am Jang
- Department of Applied Biology, Institute of Environmentally-Friendly Agriculture (IEFA), College of Agriculture and Life Sciences, Chonnam National University, Gwangju, South Korea
| | - Maryam Ali Mohammadie Kojour
- Department of Applied Biology, Institute of Environmentally-Friendly Agriculture (IEFA), College of Agriculture and Life Sciences, Chonnam National University, Gwangju, South Korea
| | - Bharat Bhusan Patnaik
- Post Graduate (PG) Department of Biosciences and Biotechnology, Fakir Mohan University, Balasore, India
- Department of Biology, College of Natural Sciences, Soonchunhyang University, Asan, South Korea
| | - Yeon Soo Han
- Department of Applied Biology, Institute of Environmentally-Friendly Agriculture (IEFA), College of Agriculture and Life Sciences, Chonnam National University, Gwangju, South Korea
| | - Yong Hun Jo
- Department of Applied Biology, Institute of Environmentally-Friendly Agriculture (IEFA), College of Agriculture and Life Sciences, Chonnam National University, Gwangju, South Korea
- *Correspondence: Yong Hun Jo,
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Chen C, Yang L, Abbas MN, Zou D, Li J, Geng X, Zhang H, Sun Y. Relish regulates innate immunity via mediating ATG5 activity in Antheraea pernyi. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2022; 132:104406. [PMID: 35364136 DOI: 10.1016/j.dci.2022.104406] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 03/22/2022] [Accepted: 03/27/2022] [Indexed: 06/14/2023]
Abstract
In innate immunity, autophagy is an important molecular mechanism that plays a critical role in the animal defense system. Given the importance of anti-microbial autophagy in the innate immune processes, the relationship between anti-microbial autophagy and LPS-induced innate immunity in A. pernyi was investigated. Quantitative RT-PCR analysis revealed that autophagy-related genes (ATG6, ATG5, and ATG12) were induced following LPS injection. LPS treatment in the Relish knockdown larvae reduced the expression of autophagy-related genes, especially ATG5. Furthermore, ATG5 depletion decreased the innate immune effect, while its over-expression with ATG12 was induced after the LPS challenge. The dual-luciferase assay revealed that Relish could regulate ATG5 expression by binding directly to the promoter of the ATG5 gene. Overall, our findings show that Relish regulates the ATG5 transcription to eliminate Gram-negative bacteria by anti-microbial autophagy, implying a strong connection between autophagy and innate immunity in immunologic homeostasis.
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Affiliation(s)
- Chen Chen
- College of Life Sciences, Huaibei Normal University, Huaibei, 235000, China
| | - Liangli Yang
- College of Life Sciences, Anhui Agricultural University, Hefei, 230036, China
| | - Muhammad Nadeem Abbas
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, 400715, China
| | - Deng Zou
- College of Life Sciences, Huaibei Normal University, Huaibei, 235000, China
| | - Jun Li
- College of Life Sciences, Huaibei Normal University, Huaibei, 235000, China
| | - Xuexia Geng
- College of Life Sciences, Huaibei Normal University, Huaibei, 235000, China
| | - Haijun Zhang
- College of Life Sciences, Huaibei Normal University, Huaibei, 235000, China.
| | - Yuxuan Sun
- College of Life Sciences, Huaibei Normal University, Huaibei, 235000, China.
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8
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D'Souza LC, Dwivedi S, Raihan F, Yathisha UG, Raghu SV, Mamatha BS, Sharma A. Hsp70 overexpression in Drosophila hemocytes attenuates benzene-induced immune and developmental toxicity via regulating ROS/JNK signaling pathway. ENVIRONMENTAL TOXICOLOGY 2022; 37:1723-1739. [PMID: 35301792 DOI: 10.1002/tox.23520] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 12/07/2021] [Accepted: 03/06/2022] [Indexed: 06/14/2023]
Abstract
Benzene, a ubiquitous environmental chemical, is known to cause immune dysfunction and developmental defects. This study aims to investigate the relation between benzene-induced immune dysfunction and developmental toxicity in a genetically tractable animal model, Drosophila melanogaster. Further, the study explored the protective role of Heat Shock Protein 70 (Hsp70) against benzene-induced immunotoxicity and subsequent developmental impact. Drosophila larvae exposed to benzene (1.0, 10.0, and 100.0 mM) were examined for total hemocyte (immune cells) count, phagocytic activity, oxidative stress, apoptosis, and their developmental delay and reduction were analyzed. Benzene exposure for 48 h reduced the total hemocytes count and phagocytic activity, along with an increase in the Reactive Oxygen Species (ROS), and lipid peroxidation in the larval hemocytes. Subsequently, JNK-dependent activation of the apoptosis (Caspase-3 dependent) was also observed. During their development, benzene exposure to Drosophila larvae led to 3 days of delay in development, and ~40% reduced adult emergence. Hsp70-overexpression in hemocytes was found to mitigate benzene-induced oxidative stress and abrogated the JNK-mediated apoptosis in hemocytes, thus restoring total hemocyte count and improving phagocytotic activity. Further, hsp70-overexpression in hemocytes also lessened the benzene-induced developmental delay (rescue of 2.5 days) and improved adult emergence (~20%) emergence, revealing a possible control of immune cells on the organism's development and survival. Overall, this study established that hsp70-overexpression in the Drosophila hemocytes confers protection against benzene-induced immune injury via regulating the ROS/JNK signaling pathway, which helps in the organism's survival and development.
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Affiliation(s)
- Leonard Clinton D'Souza
- Division of Environmental Health and Toxicology, Nitte (Deemed to be University), Nitte University Centre for Science Education and Research (NUCSER), Mangaluru, India
| | - Shiwangi Dwivedi
- Division of Environmental Health and Toxicology, Nitte (Deemed to be University), Nitte University Centre for Science Education and Research (NUCSER), Mangaluru, India
| | - Faiza Raihan
- Division of Environmental Health and Toxicology, Nitte (Deemed to be University), Nitte University Centre for Science Education and Research (NUCSER), Mangaluru, India
| | - Undiganalu Gangadharappa Yathisha
- Division of Food Safety and Nutrition, Nitte (Deemed to be University), Nitte University Centre for Science Education and Research (NUCSER), Mangaluru, India
| | | | - Bangera Sheshappa Mamatha
- Division of Food Safety and Nutrition, Nitte (Deemed to be University), Nitte University Centre for Science Education and Research (NUCSER), Mangaluru, India
| | - Anurag Sharma
- Division of Environmental Health and Toxicology, Nitte (Deemed to be University), Nitte University Centre for Science Education and Research (NUCSER), Mangaluru, India
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Beneficial commensal bacteria promote Drosophila growth by down-regulating the expression of peptidoglycan recognition proteins. iScience 2022; 25:104357. [PMID: 35601912 PMCID: PMC9121327 DOI: 10.1016/j.isci.2022.104357] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 11/24/2021] [Accepted: 04/29/2022] [Indexed: 11/22/2022] Open
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Wang Z, Zhou W, Huang B, Gao M, Li Q, Tao Y, Wang Z. Molecular and Functional Characterization of Peptidoglycan Recognition Proteins OfPGRP-A and OfPGRP-B in Ostrinia furnacalis (Lepidoptera: Crambidae). INSECTS 2022; 13:insects13050417. [PMID: 35621753 PMCID: PMC9146462 DOI: 10.3390/insects13050417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 04/25/2022] [Accepted: 04/26/2022] [Indexed: 11/22/2022]
Abstract
Simple Summary The Asian corn borer, Ostrinia furnacalis (Guenée), is the most destructive lepidopteran insect pest of corn (Zea mays L.) in China. Pathogenic microorganisms play an important role in the population control of the Asian corn borer. Although microorganisms can cause the death of O. furnacalis, an immune response also occurs as an attempt to fight off and eliminate invading pathogens. If the molecular mechanism of interaction between O. furnacalis and pathogenic bacteria is clarified, the lethal effect of pathogenic microorganisms can be better exerted by inhibiting the natural immune response of O. furnacalis. As an important member of the pattern-recognition receptor family, peptidoglycan recognition protein (PGRP) plays a key role in the insect innate immune response. In this study, we cloned two PGRP genes from O. furnacalis and analyzed their spatiotemporal expression. In combination with bacterial induction experiments, we revealed the immune signal recognition pathway involved in the two proteins. The results of this study deepen the understanding of the natural immune response of O. furnacalis and provide new ideas for better utilization of pathogenic microorganisms in biological control of the Asian corn borer. Abstract Peptidoglycan recognition proteins (PGRPs) are important components of insect immune systems, in which they play key roles. We cloned and sequenced two full-length PGRP, named OfPGRP-A and OfPGRP-B, from the Asian corn borer, Ostrinia furnacalis. These two genes comprise open reading frames of 658 and 759 bp, encoding proteins of 192 and 218 amino acids, respectively. qPCR showed that OfPGRP-A and OfPGRP-B are prominently expressed in the midgut of O. furnacalis fourth instar larvae. After inoculation with Staphylococcus aureus and Bacillus thuringiensis, the expression of OfPGRP-A was significantly upregulated, whereas the expression of OfPGRP-B was enhanced after inoculation with Escherichia coli. This suggests that OfPGRP-A mainly recognizes Gram-positive bacteria and may participate in the Toll signaling pathways, while OfPGRP-B identifies Gram-negative bacteria and may participate in Imd signaling pathways. Our results provide insights into the roles of PGRPs in O. furnacalis immune function and a foundation for using pathogens for the biological control of O. furnacalis.
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Affiliation(s)
- Zengxia Wang
- College of Agriculture, Anhui Science and Technology University, Fengyang 233100, China; (B.H.); (M.G.); (Q.L.); (Y.T.)
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, MOA—CABI Joint Laboratory for Bio-Safety, Institute of Plant Protection, Chinese Academy of Agricultural Science, Beijing 100193, China
- Correspondence: (Z.W.); (Z.W.)
| | - Wan Zhou
- College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, China;
| | - Baohong Huang
- College of Agriculture, Anhui Science and Technology University, Fengyang 233100, China; (B.H.); (M.G.); (Q.L.); (Y.T.)
| | - Mengyuan Gao
- College of Agriculture, Anhui Science and Technology University, Fengyang 233100, China; (B.H.); (M.G.); (Q.L.); (Y.T.)
| | - Qianqian Li
- College of Agriculture, Anhui Science and Technology University, Fengyang 233100, China; (B.H.); (M.G.); (Q.L.); (Y.T.)
| | - Yidong Tao
- College of Agriculture, Anhui Science and Technology University, Fengyang 233100, China; (B.H.); (M.G.); (Q.L.); (Y.T.)
| | - Zhenying Wang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, MOA—CABI Joint Laboratory for Bio-Safety, Institute of Plant Protection, Chinese Academy of Agricultural Science, Beijing 100193, China
- Correspondence: (Z.W.); (Z.W.)
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11
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Meng Y, Dai W, Lin Z, Zhang W, Dong Y. Expression and functional characterization of peptidoglycan recognition protein-S6 involved in antibacterial responses in the razor clam Sinonovacula constricta. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2022; 129:104331. [PMID: 34883108 DOI: 10.1016/j.dci.2021.104331] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 11/21/2021] [Accepted: 12/04/2021] [Indexed: 06/13/2023]
Abstract
It has been recognized that peptidoglycan recognition proteins (PGRPs), structurally conserved molecules, play crucial roles in the innate immunity of invertebrate. However, few studies have been taken to explore their potential functions. In this study, a novel PGRP from the razor clam Sinonovacula constrict designated as ScPGRP-S6 was identified and characterized. The open reading frame (ORF) of ScPGRP-S6 was 666 bp in length, encoding a protein of 221 amino acid with a signal peptide (1-30) and a typical PGRP domain (39-187). The sequence alignment combined with phylogenetic analysis collectively confirmed that ScPGRP-S6 was a novel member belonging to PGRP-S family. The mRNA transcript of ScPGRP-S6 in the hepatopancreases was significantly up-regulated after peptidoglycan (PGN) stimulation, while it was moderately up-regulated after lipopolysaccharide (LPS) stimulation. The result of immunofluorescence detection demonstrated that the positive signal enhanced obviously after Vibrio parahaemolyticus challenge. Notably, the recombinant protein of ScPGRP-S6 (designed as rScPGRP-S6) exhibited high agglutination activity towards V. parahaemolyticus but weak to Staphylococcus aureus. Furthermore, rScPGRP-S6 showed strong amidase and antibacterial activity in the presence of Zn2+. Collectively, our results manifested that ScPGRP-S6 could act as a scavenger in the innate immune response of S. constricta.
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Affiliation(s)
- Yiping Meng
- Zhejiang Key Laboratory of Aquatic Germplasm Resource, College of Biological & Environmental Sciences, Zhejiang Wanli University, Ningbo, 315100, PR China; College of Marine Sciences, Ningbo University, Ningbo, 315010, PR China
| | - Wenfang Dai
- Ninghai Institute of Mariculture Breeding and Seed Industry, Zhejiang Wanli University, Ninghai, 315604, PR China
| | - Zhihua Lin
- Zhejiang Key Laboratory of Aquatic Germplasm Resource, College of Biological & Environmental Sciences, Zhejiang Wanli University, Ningbo, 315100, PR China; Ninghai Institute of Mariculture Breeding and Seed Industry, Zhejiang Wanli University, Ninghai, 315604, PR China
| | - Weiwei Zhang
- College of Marine Sciences, Ningbo University, Ningbo, 315010, PR China
| | - Yinghui Dong
- Zhejiang Key Laboratory of Aquatic Germplasm Resource, College of Biological & Environmental Sciences, Zhejiang Wanli University, Ningbo, 315100, PR China; Ninghai Institute of Mariculture Breeding and Seed Industry, Zhejiang Wanli University, Ninghai, 315604, PR China.
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12
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Li Q, Cui K, Xu D, Wu M, Mai K, Ai Q. Molecular identification of peptidoglycan recognition protein 5 and its functional characterization in innate immunity of large yellow croaker, Larimichthys crocea. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2021; 124:104130. [PMID: 34081942 DOI: 10.1016/j.dci.2021.104130] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/05/2021] [Accepted: 05/08/2021] [Indexed: 06/12/2023]
Abstract
Fish peptidoglycan recognition proteins (PGRPs) play important roles in microbial recognition, and bacterial elimination. In the present study, a short-type PGRP from large yellow croaker, LcPGRP5 was cloned and its functions were characterized. LcPGRP5 gene encodes a protein containing conserved PGRP domain, but no signal peptide. Phylogenetic analysis shows that LcPGRP5 is clustered with other short PGRPs identified in other teleosts. LcPGRP5 is constitutively expressed in all tissues examined, with the highest expression being detected in the head kidney. Recombinant LcPGRP5 protein features amidase activity and bactericidal activity. Notably, LcPGRP5 could enhance the phagocytosis of the bacteria by large yellow croaker macrophage, with higher phagocytic capacity being observed in Staphylococcus aureus compared to Escherichia coli. Moreover, overexpression of LcPGRP5 suppresses pro-inflammatory effects elicited by bacterial exposure in the macrophage cell line. Overall, the present results clearly indicate the important roles of LcPGRP5 played in the innate immune responses against bacterial infection.
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Affiliation(s)
- Qingfei Li
- Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), College of Fisheries, Ocean University of China, Qingdao, China
| | - Kun Cui
- Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), College of Fisheries, Ocean University of China, Qingdao, China
| | - Dan Xu
- Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), College of Fisheries, Ocean University of China, Qingdao, China
| | - Mengjiao Wu
- Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), College of Fisheries, Ocean University of China, Qingdao, China
| | - Kangsen Mai
- Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), College of Fisheries, Ocean University of China, Qingdao, China; Laboratory for Marine Fisheries and Aquaculture, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Qinghui Ai
- Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), College of Fisheries, Ocean University of China, Qingdao, China; Laboratory for Marine Fisheries and Aquaculture, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China.
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13
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Jugder BE, Kamareddine L, Watnick PI. Microbiota-derived acetate activates intestinal innate immunity via the Tip60 histone acetyltransferase complex. Immunity 2021; 54:1683-1697.e3. [PMID: 34107298 DOI: 10.1016/j.immuni.2021.05.017] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 04/05/2021] [Accepted: 05/24/2021] [Indexed: 02/06/2023]
Abstract
Microbe-derived acetate activates the Drosophila immunodeficiency (IMD) pathway in a subset of enteroendocrine cells (EECs) of the anterior midgut. In these cells, the IMD pathway co-regulates expression of antimicrobial and enteroendocrine peptides including tachykinin, a repressor of intestinal lipid synthesis. To determine whether acetate acts on a cell surface pattern recognition receptor or an intracellular target, we asked whether acetate import was essential for IMD signaling. Mutagenesis and RNA interference revealed that the putative monocarboxylic acid transporter Tarag was essential for enhancement of IMD signaling by dietary acetate. Interference with histone deacetylation in EECs augmented transcription of genes regulated by the steroid hormone ecdysone including IMD targets. Reduced expression of the histone acetyltransferase Tip60 decreased IMD signaling and blocked rescue by dietary acetate and other sources of intracellular acetyl-CoA. Thus, microbe-derived acetate induces chromatin remodeling within enteroendocrine cells, co-regulating host metabolism and intestinal innate immunity via a Tip60-steroid hormone axis that is conserved in mammals.
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Affiliation(s)
- Bat-Erdene Jugder
- Division of Infectious Diseases, Boston Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA
| | - Layla Kamareddine
- Department of Biomedical Sciences, College of Health Sciences, QU Health, Qatar University, Doha, Qatar; Biomedical Research Center, Qatar University, Doha, Qatar; Biomedical and Pharmaceutical Research Unit, QU Health, Qatar University, Doha, Qatar
| | - Paula I Watnick
- Division of Infectious Diseases, Boston Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA.
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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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Satapathy P, Prakash JK, Gowda VC, More SS, K M, Chandramohan V, Zameer F. Targeting Imd pathway receptor in Drosophila melanogaster and repurposing of phyto-inhibitors: structural modulation and molecular dynamics. J Biomol Struct Dyn 2020; 40:1659-1670. [PMID: 33050786 DOI: 10.1080/07391102.2020.1831611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Dysbiosis is a major cause of disease in an individual, generally initiated in the gastrointestinal tract. The gut, also known as the second brain, constitutes a major role in immune signaling. To study the immunity cascade, the Drosophila model was considered targeting the Imd pathway receptor (2F2L) located in the midgut. This receptor further initiates the immune signaling mechanism influenced by bacteria. To inhibit the Imd pathway, the crystal structure of Imd with PDB: 2F2L was considered for the screening of suitable ligand/inhibitor. In light of our previous studies, repurposing of anti-diabetic ligands from the banana plant namely lupeol (LUP), stigmasterol (STI), β-sitosterol (BST) and umbelliferone (UMB) were screened. This study identifies the potential inhibitor along with the tracheal toxin (TCT), a major peptidoglycan constituent of microbes. The molecular docking and molecular dynamics simulation of complexes 2F2L-MLD, 2F2L- CAP, 2F2L-LUP, 2F2L-BST, 2F2L-STI and 2F2L-UMB elucidates the intermolecular interaction into the inhibitory property of ligands. The results of this study infer LUP and UMB as better ligands with high stability and functionality among the screened candidates. This study provides insights into the dysbiosis and its amelioration by plant-derived molecules. The identified drugs (LUP & UMB) will probably act as an inhibitor against microbial dysbiosis and other related pathogenesis (diabetes and diabetic neuropathy). Further, this study will widen avenues in fly biology research and which could be used as a therapeutic model in the rapid, reliable and reproducible screening of phytobiologics in complementary and alternative medicine for various lifestyle associated complications.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Pankaj Satapathy
- School of Basic and Applied Sciences, Department of Biological Sciences, Dayananda Sagar University, Bengaluru, Karnataka, India
| | - Jeevan Kallur Prakash
- Department of Biotechnology, Siddaganga Institute of Technology, Tumakuru, Karnataka, India
| | - V Chirag Gowda
- Department of Biotechnology, Siddaganga Institute of Technology, Tumakuru, Karnataka, India
| | - Sunil S More
- School of Basic and Applied Sciences, Department of Biological Sciences, Dayananda Sagar University, Bengaluru, Karnataka, India
| | - Muthuchelian K
- School of Basic and Applied Sciences, Department of Biological Sciences, Dayananda Sagar University, Bengaluru, Karnataka, India
| | - Vivek Chandramohan
- Department of Biotechnology, Siddaganga Institute of Technology, Tumakuru, Karnataka, India
| | - Farhan Zameer
- School of Basic and Applied Sciences, Department of Biological Sciences, Dayananda Sagar University, Bengaluru, Karnataka, India
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16
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Yanagawa A, Huang W, Yamamoto A, Wada-Katsumata A, Schal C, Mackay TFC. Genetic Basis of Natural Variation in Spontaneous Grooming in Drosophila melanogaster. G3 (BETHESDA, MD.) 2020; 10:3453-3460. [PMID: 32727922 PMCID: PMC7467001 DOI: 10.1534/g3.120.401360] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 07/28/2020] [Indexed: 12/29/2022]
Abstract
Spontaneous grooming behavior is a component of insect fitness. We quantified spontaneous grooming behavior in 201 sequenced lines of the Drosophila melanogaster Genetic Reference Panel and observed significant genetic variation in spontaneous grooming, with broad-sense heritabilities of 0.25 and 0.24 in females and males, respectively. Although grooming behavior is highly correlated between males and females, we observed significant sex by genotype interactions, indicating that the genetic basis of spontaneous grooming is partially distinct in the two sexes. We performed genome-wide association analyses of grooming behavior, and mapped 107 molecular polymorphisms associated with spontaneous grooming behavior, of which 73 were in or near 70 genes and 34 were over 1 kilobase from the nearest gene. The candidate genes were associated with a wide variety of gene ontology terms, and several of the candidate genes were significantly enriched in a genetic interaction network. We performed functional assessments of 29 candidate genes using RNA interference, and found that 11 affected spontaneous grooming behavior. The genes associated with natural variation in Drosophila grooming are involved with glutamate metabolism (Gdh) and transport (Eaat); interact genetically with (CCKLR-17D1) or are in the same gene family as (PGRP-LA) genes previously implicated in grooming behavior; are involved in the development of the nervous system and other tissues; or regulate the Notch and Epidermal growth factor receptor signaling pathways. Several DGRP lines exhibited extreme grooming behavior. Excessive grooming behavior can serve as a model for repetitive behaviors diagnostic of several human neuropsychiatric diseases.
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Affiliation(s)
- Aya Yanagawa
- Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan
| | - Wen Huang
- Department of Animal Science, Michigan State University, East Lansing, Michigan 48824
| | - Akihiko Yamamoto
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695-7613
| | - Ayako Wada-Katsumata
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695-7613
| | - Coby Schal
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695-7613
| | - Trudy F C Mackay
- Center for Human Genetics and Department of Genetics and Biochemistry, Clemson University, Greenwood, SC 29646
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17
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Keshavarz M, Jo YH, Edosa TT, Han YS. Tenebrio molitor PGRP-LE Plays a Critical Role in Gut Antimicrobial Peptide Production in Response to Escherichia coli. Front Physiol 2020; 11:320. [PMID: 32372972 PMCID: PMC7179671 DOI: 10.3389/fphys.2020.00320] [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: 12/20/2019] [Accepted: 03/20/2020] [Indexed: 12/15/2022] Open
Abstract
Invading pathogens are recognized by peptidoglycan recognition proteins (PGRPs) that induce translocation of NF-κB transcription proteins and expression of robust antimicrobial peptides (AMPs). Tenebrio molitor PGRP-LE (TmPGRP-LE) has been previously identified as a key sensor of Listeria monocytogenes infection. Here, we present that TmPGRP-LE is highly expressed in the gut of T. molitor larvae and 5-day-old adults in the absence of microbial infection. In response to Escherichia coli and Candida albicans infections, TmPGRP-LE mRNA levels are significantly upregulated in both the fat body and gut. Silencing of TmPGRP-LE by RNAi rendered T. molitor significantly more susceptible to challenge by E. coli infection and, to a lesser extent, Staphylococcus aureus and C. albicans infections. Reduction of TmPGRP-LE levels in the larval gut resulted in downregulation of eight AMP genes following exposure to E. coli, S. aureus, and C. albicans. However, the transcriptional levels of AMPs more rapidly reached a higher level in the dsEGFP-treated larval gut after challenge with E. coli, which may suggest that AMPs induction were more sensitive to E. coli than S. aureus and C. albicans. In addition, TmPGRP-LE RNAi following E. coli and C. albicans challenges had notable effects on TmRelish, TmDorsal X1 isoform (TmDorX1), and TmDorX2 expression level in the fat body and gut. Taken together, TmPGRP-LE acts as an important gut microbial sensor that induces AMPs via Imd activation in response to E. coli, whereas involvement of TmPGRP-LE in AMPs synthesize is barely perceptible in the hemocytes and fat body.
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Affiliation(s)
- Maryam Keshavarz
- Department of Applied Biology, College of Agriculture and Life Sciences, Institute of Environmentally-Friendly Agriculture (IEFA), Chonnam National University, Gwangju, South Korea
| | - Yong Hun Jo
- Department of Applied Biology, College of Agriculture and Life Sciences, Institute of Environmentally-Friendly Agriculture (IEFA), Chonnam National University, Gwangju, South Korea
| | - Tariku Tesfaye Edosa
- Department of Applied Biology, College of Agriculture and Life Sciences, Institute of Environmentally-Friendly Agriculture (IEFA), Chonnam National University, Gwangju, South Korea
| | - Yeon Soo Han
- Department of Applied Biology, College of Agriculture and Life Sciences, Institute of Environmentally-Friendly Agriculture (IEFA), Chonnam National University, Gwangju, South Korea
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18
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Rodgers FH, Cai JA, Pitaluga AN, Mengin-Lecreulx D, Gendrin M, Christophides GK. Functional analysis of the three major PGRPLC isoforms in the midgut of the malaria mosquito Anopheles coluzzii. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2020; 118:103288. [PMID: 31760136 DOI: 10.1016/j.ibmb.2019.103288] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 10/17/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
Peptidoglycan recognition proteins (PGRPs) constitute the primary means of bacterial recognition in insects. Recent work in the model organism Drosophila has revealed the mechanisms by which the complement of PGRPs refine the sensitivity of different tissues to bacterial elicitors, permitting the persistence of commensal bacteria in the gut whilst maintaining vigilance against bacterial infection. Here, we use in vivo knockdowns and in vitro pull-down assays to investigate the role of the three major isoforms of the transmembrane receptor of the Imd pathway, PGRPLC, in basal immunity in the Anopheles coluzzii mosquito midgut. Our results indicate that the mosquito midgut is regionalized in its expression of immune effectors and of PGRPLC1. We show that PGRPLC1 and PGRPLC3 are pulled down with polymeric DAP-type peptidoglycan, while PGRPLC2 and PGRPLC3 co-precipitate in the presence of TCT, a peptidoglycan monomer. These data suggest that, as found in Drosophila, discrimination of polymeric and monomeric PGN by Anopheles PGRPLC participates in the regulation of the Imd pathway.
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Affiliation(s)
- Faye H Rodgers
- Department of Life Sciences, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Julia A Cai
- Department of Life Sciences, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Andre N Pitaluga
- Department of Life Sciences, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Dominique Mengin-Lecreulx
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud and Université Paris-Saclay, 91198, Gif-sur-Yvette, France
| | - Mathilde Gendrin
- Department of Life Sciences, Imperial College London, Exhibition Road, London, SW7 2AZ, UK; Institut Pasteur de la Guyane, BP6010 Cayenne, French Guiana, France & Department of Parasites and Insect Vectors, Institut Pasteur, Paris, France
| | - George K Christophides
- Department of Life Sciences, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.
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19
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Liu W, Wang Y, Zhou J, Zhang Y, Ma Y, Wang D, Jiang Y, Shi S, Qin L. Peptidoglycan recognition proteins regulate immune response of Antheraea pernyi in different ways. J Invertebr Pathol 2019; 166:107204. [DOI: 10.1016/j.jip.2019.107204] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 05/17/2019] [Accepted: 05/23/2019] [Indexed: 12/14/2022]
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20
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Chevée V, Sachar U, Yadav S, Heryanto C, Eleftherianos I. The peptidoglycan recognition protein PGRP-LE regulates the Drosophila immune response against the pathogen Photorhabdus. Microb Pathog 2019; 136:103664. [PMID: 31404632 DOI: 10.1016/j.micpath.2019.103664] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/09/2019] [Accepted: 08/09/2019] [Indexed: 12/15/2022]
Abstract
Photorhabdus bacteria are potent pathogens of insects and humans. To elucidate the infection strategies Photorhabdus employs to subvert the host innate immune response, it is critical to use model organisms that permit the genetic dissection of the dynamics involved in host-pathogen interactions. Here, we employed the fruit fly Drosophila melanogaster to interrogate the role of the immune deficiency (Imd) pathway receptor peptidoglycan recognition protein LE (PGRP-LE) in the regulation of the fly's response to the insect pathogen Photorhabdus luminescens and the insect/human pathogen P. asymbiotica. We show that PGRP-LE is upregulated in response to injection of Photorhabdus bacteria in background control flies, and that loss-of-function PGRP-LE mutant flies are more sensitive specifically to P. luminescens infection and harbor a higher bacterial burden of this species compared to background controls. Also, our results indicate that the absence of functional PGRP-LE alters the transcriptional pathway activity of Imd and Jnk signaling upon infection with P. asymbiotica, while infection with P. luminescens modifies the activity of Jak/Stat signaling. These findings denote the participation of the PGRP-LE receptor in the response of D. melanogaster to Photorhabdus challenge and contribute to a better understanding of pathogen detection and host immune regulation against virulent microbial invaders.
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Affiliation(s)
- Victoria Chevée
- Infection and Innate Immunity Lab, Department of Biological Sciences, 800 22nd Street NW, Washington, DC, 200 52, USA
| | - Upasana Sachar
- Infection and Innate Immunity Lab, Department of Biological Sciences, 800 22nd Street NW, Washington, DC, 200 52, USA
| | - Shruti Yadav
- Infection and Innate Immunity Lab, Department of Biological Sciences, 800 22nd Street NW, Washington, DC, 200 52, USA
| | - Christa Heryanto
- Infection and Innate Immunity Lab, Department of Biological Sciences, 800 22nd Street NW, Washington, DC, 200 52, USA
| | - Ioannis Eleftherianos
- Infection and Innate Immunity Lab, Department of Biological Sciences, 800 22nd Street NW, Washington, DC, 200 52, USA.
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21
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Kleino A, Silverman N. Regulation of the Drosophila Imd pathway by signaling amyloids. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2019; 108:16-23. [PMID: 30857831 PMCID: PMC6474834 DOI: 10.1016/j.ibmb.2019.03.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 02/19/2019] [Accepted: 03/05/2019] [Indexed: 05/09/2023]
Abstract
Fruit flies elicit effective defense responses against numerous microbes. The responses against Gram-negative bacteria are mediated by the Imd pathway, an evolutionarily conserved NF-κB pathway recognizing meso-diaminopimelic acid (DAP)-type peptidoglycan from bacterial cell walls. Several reviews already provide a detailed view of ligand recognition and signal transduction during Imd signaling, but the formation and regulation of the signaling complex immediately downstream of the peptidoglycan-sensing receptors is still elusive. In this review, we focus on the formation of the Imd amyloidal signaling center and post-translational modifications in the assembly and disassembly of the Imd signaling complex.
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Affiliation(s)
- Anni Kleino
- Aarhus Institute of Advanced Studies (AIAS), Aarhus University, 8000, Aarhus C, Denmark
| | - Neal Silverman
- Division of Infectious Diseases and Immunology, Department of Medicine, University of Massachusetts Medical School, Worcester, MA, 01605, USA.
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22
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Jiang L, Liu W, Guo H, Dang Y, Cheng T, Yang W, Sun Q, Wang B, Wang Y, Xie E, Xia Q. Distinct Functions of Bombyx mori Peptidoglycan Recognition Protein 2 in Immune Responses to Bacteria and Viruses. Front Immunol 2019; 10:776. [PMID: 31031766 PMCID: PMC6473039 DOI: 10.3389/fimmu.2019.00776] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 03/25/2019] [Indexed: 11/13/2022] Open
Abstract
Peptidoglycan recognition protein (PGRP) is an important pattern recognition receptor in innate immunity that is vital for bacterial recognition and defense in insects. Few studies report the role of PGRP in viral infection. Here we cloned two forms of PGRP from the model lepidopteran Bombyx mori: BmPGRP2-1 is a transmembrane protein, whereas BmPGRP2-2 is an intracellular protein. BmPGRP2-1 bound to diaminopimelic acid (DAP)-type peptidoglycan (PGN) to activate the canonical immune deficiency (Imd) pathway. BmPGRP2-2 knockdown reduced B. mori nucleopolyhedrovirus (BmNPV) multiplication and mortality in cell lines and in silkworm larvae, while its overexpression increased viral replication. Transcriptome and quantitative PCR (qPCR) results confirmed that BmPGRP2 negatively regulated phosphatase and tensin homolog (PTEN). BmPGRP2-2 expression was induced by BmNPV, and the protein suppressed PTEN-phosphoinositide 3-kinase (PI3K)/Akt signaling to inhibit cell apoptosis, suggesting that BmNPV modulates BmPGRP2-2-PTEN-PI3K/Akt signaling to evade host antiviral defense. These results demonstrate that the two forms of BmPGRP2 have different functions in host responses to bacteria and viruses.
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Affiliation(s)
- Liang Jiang
- Biological Science Research Center, Southwest University, Chongqing, China.,Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - Weiqiang Liu
- Biological Science Research Center, Southwest University, Chongqing, China
| | - Huizhen Guo
- Biological Science Research Center, Southwest University, Chongqing, China.,Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - Yinghui Dang
- Biological Science Research Center, Southwest University, Chongqing, China
| | - Tingcai Cheng
- Biological Science Research Center, Southwest University, Chongqing, China.,Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - Wanying Yang
- Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, South China Agricultural University, Guangzhou, China
| | - Qiang Sun
- Biological Science Research Center, Southwest University, Chongqing, China
| | - Bingbing Wang
- Biological Science Research Center, Southwest University, Chongqing, China
| | - Yumei Wang
- Biological Science Research Center, Southwest University, Chongqing, China
| | - Enyu Xie
- Biological Science Research Center, Southwest University, Chongqing, China
| | - Qingyou Xia
- Biological Science Research Center, Southwest University, Chongqing, China.,Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
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23
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Induction and Suppression of NF-κB Signalling by a DNA Virus of Drosophila. J Virol 2019; 93:JVI.01443-18. [PMID: 30404807 DOI: 10.1128/jvi.01443-18] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 10/29/2018] [Indexed: 12/12/2022] Open
Abstract
Interactions between the insect immune system and RNA viruses have been extensively studied in Drosophila, in which RNA interference, NF-κB, and JAK-STAT pathways underlie antiviral immunity. In response to RNA interference, insect viruses have convergently evolved suppressors of this pathway that act by diverse mechanisms to permit viral replication. However, interactions between the insect immune system and DNA viruses have received less attention, primarily because few Drosophila-infecting DNA virus isolates are available. In this study, we used a recently isolated DNA virus of Drosophila melanogaster, Kallithea virus (KV; family Nudiviridae), to probe known antiviral immune responses and virus evasion tactics in the context of DNA virus infection. We found that fly mutants for RNA interference and immune deficiency (Imd), but not Toll, pathways are more susceptible to Kallithea virus infection. We identified the Kallithea virus-encoded protein gp83 as a potent inhibitor of Toll signalling, suggesting that Toll mediates antiviral defense against Kallithea virus infection but that it is suppressed by the virus. We found that Kallithea virus gp83 inhibits Toll signalling through the regulation of NF-κB transcription factors. Furthermore, we found that gp83 of the closely related Drosophila innubila nudivirus (DiNV) suppresses D. melanogaster Toll signalling, suggesting an evolutionarily conserved function of Toll in defense against DNA viruses. Together, these results provide a broad description of known antiviral pathways in the context of DNA virus infection and identify the first Toll pathway inhibitor in a Drosophila virus, extending the known diversity of insect virus-encoded immune inhibitors.IMPORTANCE Coevolution of multicellular organisms and their natural viruses may lead to an intricate relationship in which host survival requires effective immunity and virus survival depends on evasion of such responses. Insect antiviral immunity and reciprocal virus immunosuppression tactics have been well studied in Drosophila melanogaster, primarily during RNA, but not DNA, virus infection. Therefore, we describe interactions between a recently isolated Drosophila DNA virus (Kallithea virus [KV]) and immune processes known to control RNA viruses, such as RNA interference (RNAi) and Imd pathways. We found that KV suppresses the Toll pathway and identified gp83 as a KV-encoded protein that underlies this suppression. This immunosuppressive ability is conserved in another nudivirus, suggesting that the Toll pathway has conserved antiviral activity against DNA nudiviruses, which have evolved suppressors in response. Together, these results indicate that DNA viruses induce and suppress NF-κB responses, and they advance the application of KV as a model to study insect immunity.
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24
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Pan H, Shi Y, Chen S, Yang Y, Yue Y, Zhan L, Dai L, Dong H, Hong W, Shi F, Jin Y. Competing RNA pairings in complex alternative splicing of a 3' variable region. RNA (NEW YORK, N.Y.) 2018; 24:1466-1480. [PMID: 30065023 PMCID: PMC6191721 DOI: 10.1261/rna.066225.118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 07/24/2018] [Indexed: 05/15/2023]
Abstract
Alternative pre-mRNA splicing remarkably expands protein diversity in eukaryotes. Drosophila PGRP-LC can generate three major 3' splice isoforms that exhibit distinct innate immune recognition and defenses against various microbial infections. However, the regulatory mechanisms underlying the uniquely biased splicing pattern at the 3' variable region remain unclear. Here we show that competing RNA pairings control the unique splicing of the 3' variable region of Drosophila PGRP-LC pre-mRNA. We reveal three roles by which these RNA pairings jointly regulate the 3' variant selection through activating the proximal 3' splice site and concurrently masking the intron-proximal 5' splice site, in combination with physical competition of RNA pairing. We also reveal that competing RNA pairings regulate alternative splicing of the highly complex 3' variable regions of Drosophila CG42235 and Pip Our findings will facilitate a better understanding of the regulatory mechanisms of highly complex alternative splicing as well as highly variable 3' processing.
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Affiliation(s)
- Huawei Pan
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Yang Shi
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Shuo Chen
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Yun Yang
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Yuan Yue
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Leilei Zhan
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Lanzhi Dai
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Haiyang Dong
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Weiling Hong
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Feng Shi
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
| | - Yongfeng Jin
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, ZJ310058, P.R. China
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Abstract
Like humans, insects face the threat of viral infection. Despite having repercussions on human health and disease, knowledge gaps exist for how insects cope with viral pathogens. Drosophila melanogaster serves as an ideal insect model due to its genetic tractability. When encountering a pathogen, two major approaches to fight disease are resistance strategies and tolerance strategies. Disease resistance strategies promote the health of the infected host by reducing pathogen load. Multiple disease resistance mechanisms have been identified in Drosophila: RNA interference, Jak/STAT signaling, Toll signaling, IMD signaling, and autophagy. Disease tolerance mechanisms, in contrast, do not reduce pathogen load directly, but rather mitigate the stress and damage incurred by infection. The main benefit of tolerance mechanisms may therefore be to provide the host with time to engage antiviral resistance mechanisms that eliminate the threat. In this review, antiviral resistance mechanisms used by Drosophila will be described and compared to mammalian antiviral mechanisms. Disease tolerance will then be explained in a broader context as this is a burgeoning field of study.
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Affiliation(s)
- Jonathan Chow
- Division of Gastroenterology, Harvard Medical School, Boston Children's Hospital, Boston, MA, United States
| | - Jonathan C Kagan
- Division of Gastroenterology, Harvard Medical School, Boston Children's Hospital, Boston, MA, United States.
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26
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Wang J, Song X, Wang M. Peptidoglycan recognition proteins in hematophagous arthropods. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2018; 83:89-95. [PMID: 29269264 PMCID: PMC5889321 DOI: 10.1016/j.dci.2017.12.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 12/11/2017] [Accepted: 12/18/2017] [Indexed: 05/24/2023]
Abstract
Hematophagous arthropods are medically important disease vectors that transmit a variety of pathogens. Unlike mammals that employ both innate and adaptive immunity to clear invading pathogens, these vectors rely mainly on an innate immune system to combat pathogens. Peptidoglycan recognition proteins (PGRPs) are important components of innate immune signaling pathways and are responsible for recognizing microbe-associated molecular patterns (MAMPs), thus regulating host immune interactions with both harmful and helpful microbes. Here we review a number of recent studies in different vectors that address the function of PGRPs in immune regulation. Further, we discuss the variation of PGRPs between vectors and Drosophila.
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Affiliation(s)
- Jingwen Wang
- Ministry of Education Key Laboratory of Contemporary Anthropology, School of Life Sciences, Fudan University, Shanghai, 200438, PR China.
| | - Xiumei Song
- Ministry of Education Key Laboratory of Contemporary Anthropology, School of Life Sciences, Fudan University, Shanghai, 200438, PR China
| | - Mengfei Wang
- Ministry of Education Key Laboratory of Contemporary Anthropology, School of Life Sciences, Fudan University, Shanghai, 200438, PR China
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27
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Chen K, Lu Z. Immune responses to bacterial and fungal infections in the silkworm, Bombyx mori. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2018; 83:3-11. [PMID: 29289612 DOI: 10.1016/j.dci.2017.12.024] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 12/17/2017] [Accepted: 12/25/2017] [Indexed: 06/07/2023]
Abstract
The silkworm Bombyx mori, an economically important insect that is usually reared indoors, is susceptible to various pathogens, including bacteria, fungi, viruses, and microsporidia. As with other insects, the silkworm lacks an adaptive immune system and relies solely on innate immunity to defend itself against infection. Compared to other intensively studied insects, such as the fruit fly and tobacco hornworm, the principal immune pathways in the silkworm remain unclear. In this article, we review the literature concerning silkworm immune responses to bacteria and fungi and present our perspectives on future research into silkworm immunity.
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Affiliation(s)
- Kangkang Chen
- Department of Entomology, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China; Department of Plant Protection, College of Horticulture and Plant Protection, Yangzhou University, Yangzhou, Jiangsu Province 225009, China
| | - Zhiqiang Lu
- Department of Entomology, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China.
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28
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Zhai Z, Huang X, Yin Y. Beyond immunity: The Imd pathway as a coordinator of host defense, organismal physiology and behavior. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2018; 83:51-59. [PMID: 29146454 DOI: 10.1016/j.dci.2017.11.008] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 11/10/2017] [Accepted: 11/13/2017] [Indexed: 06/07/2023]
Abstract
The humoral arm of host defense in Drosophila relies on two evolutionarily conserved NFκB signaling cascades, the Toll and the immune deficiency (Imd) pathways. The Imd signaling pathway senses and neutralizes Gram-negative bacteria. Its activity is tightly adjusted, allowing the host to simultaneously prevent infection by pathogenic bacteria and tolerate beneficial gut microbiota. Over-activation of Imd signaling is detrimental at least in part by causing gut dysbiosis that further exacerbates intestinal pathologies. Furthermore, it is increasingly recognized that the Imd pathway or its components also play non-immune roles. In this review, we summarize recent advances in Imd signal transduction, discuss the gut-microbiota interactions mediated by Imd signaling, and finally elaborate on its diverse physiological functions beyond immunity. Understanding the multifaceted physiological outputs of Imd activation will help integrate its immune role into the regulation of whole organismal physiology.
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Affiliation(s)
- Zongzhao Zhai
- Changsha Medical University, 410125 Changsha, China; Animal Nutrition and Human Health Laboratory, School of Life Sciences, Hunan Normal University, 410081 Changsha, Hunan, China.
| | | | - Yulong Yin
- Changsha Medical University, 410125 Changsha, China; Animal Nutrition and Human Health Laboratory, School of Life Sciences, Hunan Normal University, 410081 Changsha, Hunan, China
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Sampath V. Bacterial endotoxin-lipopolysaccharide; structure, function and its role in immunity in vertebrates and invertebrates. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.anres.2018.08.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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30
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Zhang K, Tan J, Su J, Liang H, Shen L, Li C, Pan G, Yang L, Cui H. Integrin β3 plays a novel role in innate immunity in silkworm, Bombyx mori. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2017; 77:307-317. [PMID: 28826989 DOI: 10.1016/j.dci.2017.08.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 08/16/2017] [Accepted: 08/17/2017] [Indexed: 06/07/2023]
Abstract
Integrins are transmembrane receptors that play essential roles in many physiological and pathological processes through cell-to-cell and cell-to-extracellular matrix (ECM) interactions. In the current study, a 2653-bp full-length cDNA of a novel integrin β subunit (designated Bmintegrin β3) was obtained from silkworm hemocytes. Bmintegrin β3 has the typical conserved structure of the integrin β family. The qRT-PCR results showed that Bmintegrin β3 was specifically expressed in the hematological system and that its expression was significantly increased after challenge with different types of PAMPs and bacteria. The recombinant Bmintegrin β3 protein displayed increased aggregation with S. aureus, suggesting that Bmintegrin β3 might directly bind to PAMPs. Interestingly, Bmintegrin β3 knockdown promoted PPO1, PPO2, BAEE, SPH78, SPH125, and SPH127 expression and accelerated the melanization process. Unexpectedly, the expression of genes related to phagocytosis, the Toll pathway, and the IMD pathway was also up-regulated after Bmintegrin β3 knockdown. Thus, Bmintegrin β3 might be a pattern recognition protein (PRP) for PAMPs and might directly bind to bacteria and enhance the phagocytosis activity of hemocytes. Moreover, Bmintegrin β3 and its ligand might negatively regulate the expression of immune-related genes through an unknown mechanism. In summary, our studies provide new insights into the immune functions of Bmintegrin β3 from the silkworm, Bombyx mori.
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Affiliation(s)
- Kui Zhang
- State Key Laboratory of Silkworm Genome Biology, The Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China
| | - Juan Tan
- State Key Laboratory of Silkworm Genome Biology, The Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China
| | - Jingjing Su
- State Key Laboratory of Silkworm Genome Biology, The Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China
| | - Hanghua Liang
- State Key Laboratory of Silkworm Genome Biology, The Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China
| | - Li Shen
- State Key Laboratory of Silkworm Genome Biology, The Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China
| | - Chongyang Li
- State Key Laboratory of Silkworm Genome Biology, The Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China
| | - Guangzhao Pan
- State Key Laboratory of Silkworm Genome Biology, The Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China
| | - Liqun Yang
- State Key Laboratory of Silkworm Genome Biology, The Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China
| | - Hongjuan Cui
- State Key Laboratory of Silkworm Genome Biology, The Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China.
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31
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Capo F, Chaduli D, Viallat-Lieutaud A, Charroux B, Royet J. Oligopeptide Transporters of the SLC15 Family Are Dispensable for Peptidoglycan Sensing and Transport in Drosophila. J Innate Immun 2017; 9:483-492. [PMID: 28715804 DOI: 10.1159/000475771] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 04/15/2017] [Indexed: 12/14/2022] Open
Abstract
Peptidoglycan (PGN) detection by PGN recognition proteins (PGRP) is the main trigger of the antibacterial immune response in Drosophila. Depending on the type of immune cell, PGN can be sensed either at the cell membrane by PGRP-LC or inside the cell by PGRP-LE, which plays a role similar to that of Nod2 in mammals. Previous work, mainly in cell cultures, has shown that oligopeptide transporters of the SLC15 family are essential for the delivery of PGN for Nod2 detection inside of the cells, and that this function might be conserved in flies. By generating and analyzing the immune phenotypes of loss-of-function mutations in 3 SLC15 Drosophila family members, we tested their role in mediating PGRP-LE-dependent PGN activation. Our results show that Yin, CG2930, and CG9444 are required neither for PGRP-LE activation by PGN nor for PGN transport from the gut lumen to the insect blood. These data show that, while intracellular PGN detection is an essential step of the antibacterial response in both insects and mammals, the types of PGN transporters and sensors are different in these animals.
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Affiliation(s)
- Florence Capo
- Aix Marseille Université, CNRS, Institut de Biologie du Développement de Marseille (IBDM), Marseille, France
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Alternative Pre-mRNA Splicing in Mammals and Teleost Fish: A Effective Strategy for the Regulation of Immune Responses Against Pathogen Infection. Int J Mol Sci 2017; 18:ijms18071530. [PMID: 28714877 PMCID: PMC5536018 DOI: 10.3390/ijms18071530] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 07/10/2017] [Accepted: 07/12/2017] [Indexed: 12/14/2022] Open
Abstract
Pre-mRNA splicing is the process by which introns are removed and the protein coding elements assembled into mature mRNAs. Alternative pre-mRNA splicing provides an important source of transcriptome and proteome complexity through selectively joining different coding elements to form mRNAs, which encode proteins with similar or distinct functions. In mammals, previous studies have shown the role of alternative splicing in regulating the function of the immune system, especially in the regulation of T-cell activation and function. As lower vertebrates, teleost fish mainly rely on a large family of pattern recognition receptors (PRRs) to recognize pathogen-associated molecular patterns (PAMPs) from various invading pathogens. In this review, we summarize recent advances in our understanding of alternative splicing of piscine PRRs including peptidoglycan recognition proteins (PGRPs), nucleotide binding and oligomerization domain (NOD)-like receptors (NLRs), retinoic acid-inducible gene-I (RIG-I)-like receptors (RLRs) and their downstream signaling molecules, compared to splicing in mammals. We also discuss what is known and unknown about the function of splicing isoforms in the innate immune responses against pathogens infection in mammals and teleost fish. Finally, we highlight the consequences of alternative splicing in the innate immune system and give our view of important directions for future studies.
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33
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Armitage SAO, Kurtz J, Brites D, Dong Y, Du Pasquier L, Wang HC. Dscam1 in Pancrustacean Immunity: Current Status and a Look to the Future. Front Immunol 2017. [PMID: 28649249 PMCID: PMC5465998 DOI: 10.3389/fimmu.2017.00662] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The Down syndrome cell adhesion molecule 1 (Dscam1) gene is an extraordinary example of diversity: by combining alternatively spliced exons, thousands of isoforms can be produced from just one gene. So far, such diversity in this gene has only been found in insects and crustaceans, and its essential part in neural wiring has been well-characterized for Drosophila melanogaster. Ten years ago evidence from D. melanogaster showed that the Dscam1 gene is involved in insect immune defense and work on Anopheles gambiae indicated that it is a hypervariable immune receptor. These exciting findings showed that via processes of somatic diversification insects have the possibility to produce unexpected immune molecule diversity, and it was hypothesized that Dscam1 could provide the mechanistic underpinnings of specific immune responses. Since these first publications the quest to understand the function of this gene has uncovered fascinating insights from insects and crustaceans. However, we are still far from a complete understanding of how Dscam1 functions in relation to parasites and pathogens and its full relevance for the immune system. In this Hypothesis and Theory article, we first briefly introduce Dscam1 and what we know so far about how it might function in immunity. By focusing on seven questions, we then share our sometimes contrasting thoughts on what the evidence tells us so far, what essential experiments remain to be done, and the future prospects, with the aim to provide a multiangled view on what this fascinating gene has to do with immune defense.
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Affiliation(s)
- Sophie A O Armitage
- Institute for Evolution and Biodiversity, University of Münster, Münster, Germany
| | - Joachim Kurtz
- Institute for Evolution and Biodiversity, University of Münster, Münster, Germany
| | - Daniela Brites
- Tuberculosis Research Unit, Swiss Tropical and Public Health Institute, Basel, Switzerland.,Zoological Institute, University of Basel, Basel, Switzerland
| | - Yuemei Dong
- Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, John Hopkins University, Baltimore, MD, United States
| | | | - Han-Ching Wang
- Department of Biotechnology and Bioindustry Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan
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34
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Chen L, Paquette N, Mamoor S, Rus F, Nandy A, Leszyk J, Shaffer SA, Silverman N. Innate immune signaling in Drosophila is regulated by transforming growth factor β (TGFβ)-activated kinase (Tak1)-triggered ubiquitin editing. J Biol Chem 2017; 292:8738-8749. [PMID: 28377500 DOI: 10.1074/jbc.m117.788158] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Indexed: 11/06/2022] Open
Abstract
Coordinated regulation of innate immune responses is necessary in all metazoans. In Drosophila the Imd pathway detects Gram-negative bacterial infections through recognition of diaminopimelic acid (DAP)-type peptidoglycan and activation of the NF-κB precursor Relish, which drives robust antimicrobial peptide gene expression. Imd is a receptor-proximal adaptor protein homologous to mammalian RIP1 that is regulated by proteolytic cleavage and Lys-63-polyubiquitination. However, the precise events and molecular mechanisms that control the post-translational modification of Imd remain unclear. Here, we demonstrate that Imd is rapidly Lys-63-polyubiquitinated at lysine residues 137 and 153 by the sequential action of two E2 enzymes, Ubc5 and Ubc13-Uev1a, in conjunction with the E3 ligase Diap2. Lys-63-ubiquitination activates the TGFβ-activated kinase (Tak1), which feeds back to phosphorylate Imd, triggering the removal of Lys-63 chains and the addition of Lys-48 polyubiquitin. This ubiquitin-editing process results in the proteasomal degradation of Imd, which we propose functions to restore homeostasis to the Drosophila immune response.
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Affiliation(s)
- Li Chen
- From the Division of Infectious Disease, Department of Medicine and
| | | | - Shahan Mamoor
- From the Division of Infectious Disease, Department of Medicine and
| | - Florentina Rus
- From the Division of Infectious Disease, Department of Medicine and
| | - Anubhab Nandy
- From the Division of Infectious Disease, Department of Medicine and
| | - John Leszyk
- the Proteomics and Mass Spectrometry Facility, University of Massachusetts Medical School, Worcester, Massachusetts 01605
| | - Scott A Shaffer
- the Proteomics and Mass Spectrometry Facility, University of Massachusetts Medical School, Worcester, Massachusetts 01605
| | - Neal Silverman
- From the Division of Infectious Disease, Department of Medicine and
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35
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The domain II loops of Bacillus thuringiensis Cry1Aa form an overlapping interaction site for two Bombyx mori larvae functional receptors, ABC transporter C2 and cadherin-like receptor. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2017; 1865:220-231. [DOI: 10.1016/j.bbapap.2016.11.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Revised: 11/18/2016] [Accepted: 11/21/2016] [Indexed: 11/20/2022]
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36
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Inhibition of a NF-κB/Diap1 Pathway by PGRP-LF Is Required for Proper Apoptosis during Drosophila Development. PLoS Genet 2017; 13:e1006569. [PMID: 28085885 PMCID: PMC5279808 DOI: 10.1371/journal.pgen.1006569] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 01/30/2017] [Accepted: 01/04/2017] [Indexed: 12/15/2022] Open
Abstract
NF-κB pathways are key signaling cascades of the Drosophila innate immune response. One of them, the Immune Deficiency (IMD) pathway, is under a very tight negative control. Although molecular brakes exist at each step of this signaling module from ligand availability to transcriptional regulation, it remains unknown whether repressors act in the same cells or tissues and if not, what is rationale behind this spatial specificity. We show here that the negative regulator of IMD pathway PGRP-LF is epressed in ectodermal derivatives. We provide evidence that, in the absence of any immune elicitor, PGRP-LF loss-of-function mutants, display a constitutive NF-κB/IMD activation specifically in ectodermal tissues leading to genitalia and tergite malformations. In agreement with previous data showing that proper development of these structures requires induction of apoptosis, we show that ectopic activation of NF-κB/IMD signaling leads to apoptosis inhibition in both genitalia and tergite primordia. We demonstrate that NF-κB/IMD signaling antagonizes apoptosis by up-regulating expression of the anti-apoptotic protein Diap1. Altogether these results show that, in the complete absence of infection, the negative regulation of NF-κB/IMD pathway by PGRP-LF is crucial to ensure proper induction of apoptosis and consequently normal fly development. These results highlight that IMD pathway regulation is controlled independently in different tissues, probably reflecting the different roles of this signaling cascade in both developmental and immune processes. In multicellular organism such as mammals or insects, activation of innate immune responses occurs following detection of microbes by dedicated receptors called pattern recognition receptors. Such immune activation is taking place in immune competent tissue such as the skin, the digestive and respiratory epithelia and is under a tight negative control. Negative control is essential to finely adjust the duration and the intensity of the immune response to the level of infection. We found that the Drosophila innate immunity negative regulator PGRP-LF, is specifically expressed in non-immune tissues and plays an essential role during development, in absence of any infection. Lack of PGRP-LF function in these tissues inhibits apoptosis leading to incomplete genitalia rotation and tergite malformations. We show that such apoptosis inhibition results from the over expression of the negative regulator of apoptosis Diap1 specifically in PGRP-LF expressing cells. Our data highlight that proper negative regulation of immune signaling pathway in non-immune tissues is contributing to normal development and illustrate the growing evidence of the dual role of immune signaling pathway contribution to both immunity and in development processes.
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37
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Arp AP, Hunter WB, Pelz-Stelinski KS. Annotation of the Asian Citrus Psyllid Genome Reveals a Reduced Innate Immune System. Front Physiol 2016; 7:570. [PMID: 27965582 PMCID: PMC5126049 DOI: 10.3389/fphys.2016.00570] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 11/09/2016] [Indexed: 01/06/2023] Open
Abstract
Citrus production worldwide is currently facing significant losses due to citrus greening disease, also known as Huanglongbing. The citrus greening bacteria, Candidatus Liberibacter asiaticus (CLas), is a persistent propagative pathogen transmitted by the Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae). Hemipterans characterized to date lack a number of insect immune genes, including those associated with the Imd pathway targeting Gram-negative bacteria. The D. citri draft genome was used to characterize the immune defense genes present in D. citri. Predicted mRNAs identified by screening the published D. citri annotated draft genome were manually searched using a custom database of immune genes from previously annotated insect genomes. Toll and JAK/STAT pathways, general defense genes Dual oxidase, Nitric oxide synthase, prophenoloxidase, and cellular immune defense genes were present in D. citri. In contrast, D. citri lacked genes for the Imd pathway, most antimicrobial peptides, 1,3-β-glucan recognition proteins (GNBPs), and complete peptidoglycan recognition proteins. These data suggest that D. citri has a reduced immune capability similar to that observed in A. pisum, P. humanus, and R. prolixus. The absence of immune system genes from the D. citri genome may facilitate CLas infections, and is possibly compensated for by their relationship with their microbial endosymbionts.
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Affiliation(s)
- Alex P Arp
- Citrus Research and Education Center, Department of Entomology and Nematology, University of Florida Fort Pierce, FL, USA
| | - Wayne B Hunter
- U.S. Horticultural Research Lab, Agricultural Research Service, United State Department of Agriculture Fort Pierce, FL, USA
| | - Kirsten S Pelz-Stelinski
- Citrus Research and Education Center, Department of Entomology and Nematology, University of Florida Fort Pierce, FL, USA
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38
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Kao D, Lai AG, Stamataki E, Rosic S, Konstantinides N, Jarvis E, Di Donfrancesco A, Pouchkina-Stancheva N, Sémon M, Grillo M, Bruce H, Kumar S, Siwanowicz I, Le A, Lemire A, Eisen MB, Extavour C, Browne WE, Wolff C, Averof M, Patel NH, Sarkies P, Pavlopoulos A, Aboobaker A. The genome of the crustacean Parhyale hawaiensis, a model for animal development, regeneration, immunity and lignocellulose digestion. eLife 2016; 5:20062. [PMID: 27849518 PMCID: PMC5111886 DOI: 10.7554/elife.20062] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 10/19/2016] [Indexed: 12/17/2022] Open
Abstract
The amphipod crustacean Parhyale hawaiensis is a blossoming model system for studies of developmental mechanisms and more recently regeneration. We have sequenced the genome allowing annotation of all key signaling pathways, transcription factors, and non-coding RNAs that will enhance ongoing functional studies. Parhyale is a member of the Malacostraca clade, which includes crustacean food crop species. We analysed the immunity related genes of Parhyale as an important comparative system for these species, where immunity related aquaculture problems have increased as farming has intensified. We also find that Parhyale and other species within Multicrustacea contain the enzyme sets necessary to perform lignocellulose digestion ('wood eating'), suggesting this ability may predate the diversification of this lineage. Our data provide an essential resource for further development of Parhyale as an experimental model. The first malacostracan genome will underpin ongoing comparative work in food crop species and research investigating lignocellulose as an energy source. DOI:http://dx.doi.org/10.7554/eLife.20062.001 The marine crustacean known as Parhyale hawaiensis is related to prawns, shrimps and crabs and is found at tropical coastlines around the world. This species has recently attracted scientific interest as a possible new model to study how animal embryos develop before birth and, because Parhyale can rapidly regrow lost limbs, how tissues and organs regenerate. Indeed, Parhyale has many characteristics that make it a good model organism, being small, fast-growing and easy to keep and care for in the laboratory. Several research tools have already been developed to make it easier to study Parhyale. This includes the creation of a system for using the popular gene editing technology, CRISPR, in this animal. However, one critical resource that is available for most model organisms was missing; the complete sequence of all the genetic information of this crustacean, also known as its genome, was not available. Kao, Lai, Stamataki et al. have now compiled the Parhyale genome – which is slightly larger than the human genome – and studied its genetics. Analysis revealed that Parhyale has genes that allow it to fully digest plant material. This is unusual because most animals that do this rely upon the help of bacteria. Kao, Lai, Stamataki et al. also identified genes that provide some of the first insights into the immune system of crustaceans, which protects these creatures from diseases. Kao, Lai, Stamataki et al. have provided a resource and findings that could help to establish Parhyale as a popular model organism for studying several ideas in biology, including organ regeneration and embryonic development. Understanding how Parhyale digests plant matter, for example, could progress the biofuel industry towards efficient production of greener energy. Insights from its immune system could also be adapted to make farmed shrimp and prawns more resistant to infections, boosting seafood production. DOI:http://dx.doi.org/10.7554/eLife.20062.002
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Affiliation(s)
- Damian Kao
- Department of Zoology, University of Oxford, Oxford, United Kingdom
| | - Alvina G Lai
- Department of Zoology, University of Oxford, Oxford, United Kingdom
| | - Evangelia Stamataki
- Janelia Research Campus, Howard Hughes Medical Institute, Virginia, United States
| | - Silvana Rosic
- MRC Clinical Sciences Centre, Imperial College London, London, United Kingdom.,Clinical Sciences, Imperial College London, London, United Kingdom
| | - Nikolaos Konstantinides
- Institut de Gé nomique Fonctionnelle de Lyon, Centre National de la Recherche Scientifique (CNRS) and É cole Normale Supé rieure de Lyon, Lyon, France
| | - Erin Jarvis
- Department of Molecular and Cell Biology, University of California, Berkeley, United States
| | | | | | - Marie Sémon
- Institut de Gé nomique Fonctionnelle de Lyon, Centre National de la Recherche Scientifique (CNRS) and É cole Normale Supé rieure de Lyon, Lyon, France
| | - Marco Grillo
- Institut de Gé nomique Fonctionnelle de Lyon, Centre National de la Recherche Scientifique (CNRS) and É cole Normale Supé rieure de Lyon, Lyon, France
| | - Heather Bruce
- Department of Molecular and Cell Biology, University of California, Berkeley, United States
| | - Suyash Kumar
- Janelia Research Campus, Howard Hughes Medical Institute, Virginia, United States
| | - Igor Siwanowicz
- Janelia Research Campus, Howard Hughes Medical Institute, Virginia, United States
| | - Andy Le
- Janelia Research Campus, Howard Hughes Medical Institute, Virginia, United States
| | - Andrew Lemire
- Janelia Research Campus, Howard Hughes Medical Institute, Virginia, United States
| | - Michael B Eisen
- Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, United States
| | - Cassandra Extavour
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, United States
| | - William E Browne
- Department of Invertebrate Zoology, Smithsonian National Museum of Natural History, Washington, United States
| | - Carsten Wolff
- Vergleichende Zoologie, Institut fur Biologie,Humboldt-Universitat zu Berlin, Berlin, Germany
| | - Michalis Averof
- Institut de Gé nomique Fonctionnelle de Lyon, Centre National de la Recherche Scientifique (CNRS) and É cole Normale Supé rieure de Lyon, Lyon, France
| | - Nipam H Patel
- Department of Molecular and Cell Biology, University of California, Berkeley, United States
| | - Peter Sarkies
- MRC Clinical Sciences Centre, Imperial College London, London, United Kingdom.,Clinical Sciences, Imperial College London, London, United Kingdom
| | | | - Aziz Aboobaker
- Department of Zoology, University of Oxford, Oxford, United Kingdom
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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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Abstract
The innate immune system recognizes micro-organisms through a series of pattern recognition receptors that are highly conserved in evolution. Peptidoglycan (PGN) is a unique and essential component of the cell wall of virtually all bacteria, is not present in eukaryotes, and is an excellent target for the innate immune system. Indeed, higher eukaryotes, including mammals, have several PGN recognition molecules, including CD14, Toll-like receptor 2 (TLR2), nucleotide oligomerization domain (Nod)-containing proteins, a family of peptidoglycan recognition proteins (PGRPs), and PGN-lytic enzymes (lysozyme and amidase). These molecules induce host responses to micro-organisms, degrade PGN, or have direct antimicrobial effects.
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Affiliation(s)
- Roman Dziarski
- Northwest Center for Medical Education, Indiana University School of Medicine, Gary, Indiana, USA,
| | - Dipika Gupta
- Northwest Center for Medical Education, Indiana University School of Medicine, Gary, Indiana, USA
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Bettencourt R, Tanji T, Yagi Y, Ip YT. Toll and Toll-9 in Drosophila innate immune response. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519040100040101] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In both insects and mammals, members of the Toll receptor family play important roles in the initial events leading to the activation of immunity genes. The prototypic Toll in Drosophila appears to be activated by a host protein ligand after microbial stimulation. The cellular events and the biological response after Toll activation, however, require further investigation. We used transgenic Drosophila strains expressing NF-κB and Toll proteins to investigate innate immune response in whole larvae and dissected larval fat bodies. Substantial activation of antimicrobial peptide genes was observed after septic injury. To circumvent the contribution of injury-induced response, we used dissected larval fat bodies to show that commercially available microbial compounds were able to alter the cellular distribution of Toll. The results also demonstrate that complex cellular events, including receptor trafficking, likely take place after stimulation of the larval immune tissue. By genome-wide expression analysis, we further show that Toll and Toll-9 may utilize the same signaling pathway in activating many immunity genes. Thus, the innate immune response in Drosophila is regulated by complex mechanisms, which involve Toll and other Toll-related proteins.
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Affiliation(s)
- Raul Bettencourt
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, USA
| | - Takahiro Tanji
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, USA
| | - Yoshimasa Yagi
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, USA
| | - Y. Tony Ip
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, USA, Department of Cell Biology, University of Massachusetts Medical School, Worcester, Massachusetts, USAProgram in Cell Dynamics, University of Massachusetts Medical School, Worcester, Massachusetts, USA,
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42
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Guan R, Roychowdury A, Ember B, Kumar S, Boons GJ, Mariuzza RA. Crystal structure of a peptidoglycan recognition protein (PGRP) in complex with a muramyl tripeptide from Gram-positive bacteria. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519050110010901] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Peptidoglycan recognition proteins (PGRPs) are pattern recognition receptors of the innate immune system that bind, and in some cases hydrolyse, bacterial peptidoglycans (PGNs). We determined the crystal structure of the C-terminal PGN-binding domain of human PGRP-Iα in complex with a muramyl tripeptide representing the conserved core of lysine-type PGNs. The peptide stem of the ligand is buried at the deep end of a long binding groove, with N-acetylmuramic acid situated in the middle of the groove, whose shallow end could accommodate N-acetylglucosamine. Both peptide and glycan moieties are essential for binding by PGRPs. Conservation of key PGN-contacting residues indicates that all PGRPs employ this basic PGN-binding mode. The structure identifies variable residues that likely mediate discrimination between lysine- and diaminopimelic acid-type PGNs. In addition, we propose a mechanism for PGN hydrolysis by Zn2+-containing catalytic PGRPs.
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Affiliation(s)
- Rongjin Guan
- Center for Advanced Research in Biotechnology, W.M. Keck Laboratory for Structural Biology, University of Maryland Biotechnology Institute, Rockville, Maryland, USA
| | - Abhijit Roychowdury
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Brian Ember
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Sanjay Kumar
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Geert-Jan Boons
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Roy A. Mariuzza
- Center for Advanced Research in Biotechnology, W.M. Keck Laboratory for Structural Biology, University of Maryland Biotechnology Institute, Rockville, Maryland, USA,
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Kaneko T, Golenbock D, Silverman N. Peptidoglycan recognition by the Drosophila Imd pathway. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519050110060201] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The structural requirements for recognition of peptidoglycan (PGN) by PGRP-LC and activation of the Drosophila IMD pathway are not yet clear. In order to examine this question more carefully, the activity of peptidoglycan from different types of bacteria was compared in cell-based and whole animal assays. Drosophila S2* cells, but not adult flies, responded to Lys-type Micrococcus luteus PGN, but with significantly less potency compared to Dap-type Escherichia coli PGN, while intact Lys-type PGN from Staphylococcus aureus was inactive. After treatment with lysostaphin, which digests the cross-bridging peptides, S. aureus PGN weakly stimulated the IMD pathway, similar to M. luteus PGN. Further digestion with mutanolysin, which creates monomeric PGN fragments, abolished the activity of S. aureus PGN. On the other hand, monomeric E. coli PGN, generated by mutanolysin digestion, was still active but required different isoforms of PGRP-LC for recognition. Polymeric PGN required only PGRP-LCx, while monomeric E. coli PGN required both the PGRP-LCa and PGRP-LCx isoforms. These results suggest that the recognition by PGRP-LCx alone requires polymeric PGN, and that polymeric Dap-type PGN is a more potent PGRP-LCx agonist, compared to Lys-type PGN. These results also suggest that the heteromeric PGRP-LCa/LCx receptor complex recognizes monomeric Dap-type, but not Lys-type, PGN.
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Affiliation(s)
- Takashi Kaneko
- Division of Infectious Diseases, Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, USA, Department of Periodontology, Nagasaki University School of Dentistry, Nagasaki, Japan
| | - Douglas Golenbock
- Division of Infectious Diseases, Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, USA
| | - Neal Silverman
- Division of Infectious Diseases, Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, USA,
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Neyen C, Runchel C, Schüpfer F, Meier P, Lemaitre B. The regulatory isoform rPGRP-LC induces immune resolution via endosomal degradation of receptors. Nat Immunol 2016; 17:1150-8. [PMID: 27548432 DOI: 10.1038/ni.3536] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 07/18/2016] [Indexed: 12/18/2022]
Abstract
The innate immune system needs to distinguish between harmful and innocuous stimuli to adapt its activation to the level of threat. How Drosophila mounts differential immune responses to dead and live Gram-negative bacteria using the single peptidoglycan receptor PGRP-LC is unknown. Here we describe rPGRP-LC, an alternative splice variant of PGRP-LC that selectively dampens immune response activation in response to dead bacteria. rPGRP-LC-deficient flies cannot resolve immune activation after Gram-negative infection and die prematurely. The alternative exon in the encoding gene, here called rPGRP-LC, encodes an adaptor module that targets rPGRP-LC to membrane microdomains and interacts with the negative regulator Pirk and the ubiquitin ligase DIAP2. We find that rPGRP-LC-mediated resolution of an efficient immune response requires degradation of activating and regulatory receptors via endosomal ESCRT sorting. We propose that rPGRP-LC selectively responds to peptidoglycans from dead bacteria to tailor the immune response to the level of threat.
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Affiliation(s)
- Claudine Neyen
- Global Health Institute, Swiss Federal Institute of Technology, Lausanne, Switzerland
| | - Christopher Runchel
- The Breakthrough Toby Robins Breast Cancer Research Centre, Institute of Cancer Research, London, UK
| | - Fanny Schüpfer
- Global Health Institute, Swiss Federal Institute of Technology, Lausanne, Switzerland
| | - Pascal Meier
- The Breakthrough Toby Robins Breast Cancer Research Centre, Institute of Cancer Research, London, UK
| | - Bruno Lemaitre
- Global Health Institute, Swiss Federal Institute of Technology, Lausanne, Switzerland
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45
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Vanha-Aho LM, Valanne S, Rämet M. Cytokines in Drosophila immunity. Immunol Lett 2015; 170:42-51. [PMID: 26730849 DOI: 10.1016/j.imlet.2015.12.005] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 12/14/2015] [Accepted: 12/16/2015] [Indexed: 12/12/2022]
Abstract
Cytokines are a large and diverse group of small proteins that can affect many biological processes, but most commonly cytokines are known as mediators of the immune response. In the event of an infection, cytokines are produced in response to an immune stimulus, and they function as key regulators of the immune response. Cytokines come in many shapes and sizes, and although they vary greatly in structure, their functions have been well conserved in evolution. The immune signaling pathways that respond to cytokines are remarkably conserved from fly to man. Therefore, Drosophila melanogaster, provides an excellent platform for studying the biology and function of cytokines. In this review, we will describe the cytokines and cytokine-like molecules found in the fly and discuss their roles in host immunity.
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Affiliation(s)
- Leena-Maija Vanha-Aho
- Laboratory of Experimental Immunology, BioMediTech, 33014 University of Tampere, Finland.
| | - Susanna Valanne
- Laboratory of Experimental Immunology, BioMediTech, 33014 University of Tampere, Finland
| | - Mika Rämet
- Laboratory of Experimental Immunology, BioMediTech, 33014 University of Tampere, Finland; PEDEGO Research Unit, and Medical Research Center Oulu, University of Oulu and Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland
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46
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Costechareyre D, Capo F, Fabre A, Chaduli D, Kellenberger C, Roussel A, Charroux B, Royet J. Tissue-Specific Regulation of Drosophila NF-x03BA;B Pathway Activation by Peptidoglycan Recognition Protein SC. J Innate Immun 2015; 8:67-80. [PMID: 26513145 DOI: 10.1159/000437368] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Accepted: 07/03/2015] [Indexed: 01/22/2023] Open
Abstract
In Drosophila, peptidoglycan (PGN) is detected by PGN recognition proteins (PGRPs) that act as pattern recognition receptors. Some PGRPs such as PGRP-LB or PGRP-SCs are able to cleave PGN, therefore reducing the amount of immune elicitors and dampening immune deficiency (IMD) pathway activation. The precise role of PGRP-SC is less well defined because the PGRP-SC genes (PGRP-SC1a, PGRP-SC1b and PGRP-SC2) lie very close on the chromosome and have been studied using a deletion encompassing the three genes. By generating PGRP-SC-specific mutants, we reevaluated the roles of PGRP-LB, PGRP-SC1 and PGRP-SC2, respectively, during immune responses. We showed that these genes are expressed in different gut domains and that they follow distinct transcriptional regulation. Loss-of-function mutant analysis indicates that PGRP-LB is playing a major role in IMD pathway activation and bacterial load regulation in the gut, although PGRP-SCs are expressed at high levels in this organ. We also demonstrated that PGRP-SC2 is the main negative regulator of IMD pathway activation in the fat body. Accordingly, we showed that mutants for either PGRP-LB or PGRP-SC2 displayed a distinct susceptibility to bacteria depending on the infection route. Lastly, we demonstrated that PGRP-SC1 and PGRP-SC2 are required in vivo for full Toll pathway activation by Gram-positive bacteria.
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Affiliation(s)
- Denis Costechareyre
- Institut de Biologie du Dx00E9;veloppement de Marseille, UMR 7288, CNRS, Aix Marseille Universitx00E9;, Marseille, France
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47
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Armitage SAO, Peuss R, Kurtz J. Dscam and pancrustacean immune memory - a review of the evidence. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2015; 48:315-323. [PMID: 24657209 DOI: 10.1016/j.dci.2014.03.004] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 03/04/2014] [Accepted: 03/09/2014] [Indexed: 06/03/2023]
Abstract
Evidence is accumulating for a memory-like phenomenon in the immune defence of invertebrates. Down syndrome cell adhesion molecule (Dscam) has been proposed as a key candidate for a somatically diversified receptor system in the crustaceans and insects (Pancrustacea) that could enable challenge-specific protection. However, what is the evidence for an involvement of Dscam in pancrustacean immune memory, and in particular specificity? Here we review the current state of the art, and discuss hypotheses of how Dscam could be involved in immunity. We conclude that while there is increasing evidence for the involvement of Dscam in pancrustacean immunity, crucial experiments to address whether it plays a role in specificity upon secondary encounter with a pathogen still remain to be done.
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Affiliation(s)
- Sophie A O Armitage
- Institute for Evolution and Biodiversity, University of Münster, Hüfferstrasse 1, 48149 Münster, Germany.
| | - Robert Peuss
- Institute for Evolution and Biodiversity, University of Münster, Hüfferstrasse 1, 48149 Münster, Germany.
| | - Joachim Kurtz
- Institute for Evolution and Biodiversity, University of Münster, Hüfferstrasse 1, 48149 Münster, Germany.
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48
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Yu ZL, Li JH, Xue NN, Nie P, Chang MX. Expression and functional characterization of PGRP6 splice variants in grass carp Ctenopharyngodon idella. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2014; 47:264-274. [PMID: 25149135 DOI: 10.1016/j.dci.2014.08.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 08/13/2014] [Accepted: 08/14/2014] [Indexed: 06/03/2023]
Abstract
Peptidoglycan recognition proteins (PGRPs), which are evolutionarily conserved pattern recognition receptors from insects to mammals, recognize bacterial PGN and function in antibacterial innate immunity. The existence of alternative splicing is a common feature for PGRP family. Here the splicing pattern from the splicing at the 5' end of PGRP6 gene was identified in a teleost fish, the grass carp (Ctenopharyngodon idella). Four splice variants of grass carp PGRP6 were designated as gcPGRP6a, gcPGRP6b, gcPGRP6c and gcPGRP6d, respectively. Real-time PCR revealed the different expression of these variants in fish individuals and CIK cell line in response to stimulation with different microbial ligands. Immunofluorescence microscopy and Western blotting showed that the splice variants are intracellular protein. Cell lysates from Epithelioma papulosum cyprini (EPC) cells transfected with gcPGRP6 splice variants are able to bind microbial PAMPs including Lys-type PGN from Staphylococcus aureus, DAP-type PGN from Bacillus subtilis, glucan, mannan, and microorganisms including Streptococcus dysgalactiae, Flavobacterium columnare and Saccharomyces cerevisiae. Moreover, overexpression of gcPGRP6 variants inhibited earlier stage growth of intracellular bacteria. The data also identified a specific role for gcPGRP6c variant in the positive regulation of cytolytic molecule perforin, and for gcPGRP6a, gcPGRP6b and gcPGRP6c variants in positive regulation of antimicrobial peptides (AMPs). However, the gcPGRP6d variant, which encoded basically only the PGRP domain, failed to induce the expression of perforin and AMPs. It is suggested that fish PGRP6 splice variants have common and variant-specific function in innate immune response.
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Affiliation(s)
- Zhang Long Yu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072, China; Graduate University of Chinese Academy of Sciences, Beijing 100039, China
| | - Jun Hua Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072, China
| | - Na Na Xue
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072, China
| | - Pin Nie
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072, China
| | - Ming Xian Chang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072, China.
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Udompetcharaporn A, Junkunlo K, Senapin S, Roytrakul S, Flegel TW, Sritunyalucksana K. Identification and characterization of a QM protein as a possible peptidoglycan recognition protein (PGRP) from the giant tiger shrimp Penaeus monodon. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2014; 46:146-154. [PMID: 24736204 DOI: 10.1016/j.dci.2014.04.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Revised: 04/03/2014] [Accepted: 04/06/2014] [Indexed: 06/03/2023]
Abstract
In an attempt to identify a peptidoglycan recognition protein (PGRP) in Penaeus (Penaeus) monodon, in vitro pull-down binding assays were used between shrimp proteins and purified peptidoglycan (PG). By gel electrophoresis and mass spectrometry followed by Mascot program analysis, proteins from shrimp hemocyte peripheral membrane proteins showed significant homology to records for a QM protein, actin and prophenoloxidase 2 precursor (proPO2), while proteins from cell-free plasma showed significant homology to records for a vitellogenin, a fibrinogen related protein (FREP) and a C-type lectin. Due to time and resource limitations, specific binding to PG was examined only for recombinant PmQM protein and PmLec that were synthesized based on sequences reported in the Genbank database (accession numbers FJ766846 and DQ078266, respectively). An in vitro assay revealed that hemocytes would bind with and encapsulate agarose beads coated with recombinant PmQM (rPmQM) or rPmLec and that melanization followed 2h post-encapsulation. ELISA tests confirmed specific binding of rPmQM protein to PG. This is the first time that PmQM has been reported as a potential PGRP in shrimp or any other crustacean. The two other potential PGRP identified (FREP and the vitellin-like protein present in male P. monodon, unlike other vitellin subunits) should also be expressed heterologously and tested for their ability to activate shrimp hemocytes.
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Affiliation(s)
- Attasit Udompetcharaporn
- Department of Biotechnology, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand; Center of Excellence for Shrimp Molecular Biology and Biotechnology, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand
| | - Kingkamon Junkunlo
- Department of Comparative Physiology, Evolutionary Biology Center (EBC), Uppsala University, Norbyvägen 18A, Uppsala, Sweden
| | - Saengchan Senapin
- Department of Biotechnology, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand; Center of Excellence for Shrimp Molecular Biology and Biotechnology, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand; National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathumthani 12120, Thailand
| | - Sittiruk Roytrakul
- Proteomics Research Laboratory, Genome Institute, National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, Pathumthani 12120, Thailand
| | - Timothy W Flegel
- Department of Biotechnology, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand; Center of Excellence for Shrimp Molecular Biology and Biotechnology, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand; National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathumthani 12120, Thailand
| | - Kallaya Sritunyalucksana
- Department of Biotechnology, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand; Center of Excellence for Shrimp Molecular Biology and Biotechnology, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand; Shrimp-Virus Interaction Laboratory (ASVI), National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Rama VI Rd., Bangkok 10400, Thailand.
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Premachandra HKA, Elvitigala DAS, Whang I, Lee J. Identification of a novel molluscan short-type peptidoglycan recognition protein in disk abalone (Haliotis discus discus) involved in host antibacterial defense. FISH & SHELLFISH IMMUNOLOGY 2014; 39:99-107. [PMID: 24811007 DOI: 10.1016/j.fsi.2014.04.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 04/02/2014] [Accepted: 04/23/2014] [Indexed: 06/03/2023]
Abstract
Peptidoglycan recognition proteins (PGRPs) are a widely studied group of pattern recognition receptors found in invertebrate as well as vertebrate lineages, and are involved in bacterial pathogen sensing. However, in addition to this principal role, they can also function in multiple host defense processes, including cell phagocytosis and hydrolysis of peptidoglycans (PGNs). In this study, a novel invertebrate short-type PGRP was identified in disk abalone (Haliotis discus discus) designated as AbPGRP. The complete coding sequence of AbPGRP was 534 bp, encoding a 178-amino acid protein with a predicted molecular mass of 20 kDa. The AbPGRP gene had a bipartite arrangement consisting of two exons separated by a single intron. Homology analysis revealed that AbPGRP shares conserved features, including amino acid residues critical for substrate and ion binding as well as for its amidase activity, with homologs of other species. Phylogenetic analysis of AbPGRP revealed that it likely evolved from a common ancestor of invertebrates, having significant homology with other molluscan PGRPs. Recombinant AbPGRP exhibited detectable, dose-dependent PGN-hydrolyzing activity with the presence of Zn(2+), and strong antibacterial activity against Vibrio tapetis, consistent with the functional properties previously reported for PGRPs in other mollusks. Moreover, AbPGRP transcription was induced upon treatment of healthy abalones with bacterial peptidoglycan and lipopolysaccharide, although the expression profiles differed with treatment, suggesting a capacity for discriminating between bacterial pathogens through molecular pattern recognition. Collectively, the findings of this study indicate that AbPGRP is a true homolog of invertebrate PGRPs and likely plays an indispensable role in host immunity.
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Affiliation(s)
- H K A Premachandra
- Department of Marine Life Sciences, School of Marine Biomedical Sciences, Jeju National University, Jeju Special Self-Governing Province 690-756, Republic of Korea
| | - Don Anushka Sandaruwan Elvitigala
- Department of Marine Life Sciences, School of Marine Biomedical Sciences, Jeju National University, Jeju Special Self-Governing Province 690-756, Republic of Korea
| | - Ilson Whang
- Department of Marine Life Sciences, School of Marine Biomedical Sciences, Jeju National University, Jeju Special Self-Governing Province 690-756, Republic of Korea.
| | - Jehee Lee
- Department of Marine Life Sciences, School of Marine Biomedical Sciences, Jeju National University, Jeju Special Self-Governing Province 690-756, Republic of Korea.
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