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Patel NF, Oliver SV. Generation of specific immune memory by bacterial exposure in the major malaria vector Anopheles arabiensis (Diptera: Culicidae). CURRENT RESEARCH IN INSECT SCIENCE 2024; 5:100085. [PMID: 38779142 PMCID: PMC11109336 DOI: 10.1016/j.cris.2024.100085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 05/07/2024] [Accepted: 05/08/2024] [Indexed: 05/25/2024]
Abstract
There is a growing body of evidence that invertebrates can generate improved secondary responses after a primary challenge. This immunological memory can be primed by a range of pathogens, including bacteria. The generation of immunological memory has been demonstrated in mosquitoes, with the memory primed by a range of initial stimuli. This study aimed to examine whether insecticide resistance affects the capacity to generate immunological memory. The primary hypothesis was tested by examining the capacity of genetically related laboratory-reared Anopheles arabiensis strains that differ by insecticide resistant phenotype to generate immunological memory. The competing hypothesis tested was that the bacterial virulence was the key determinant in generating immunological memory. Immune memory was generated in F1 females but not males. Immunological memory was demonstrated in both laboratory strains, but the efficacy differed by the insecticide resistant phenotype of the strain. An initial oral challenge provided by a blood meal resulted generated better memory than an oral challenge by sugar. The efficacy of memory generation between the two bacterial strains differed between the two mosquito strains. Regardless of the challenge, the two strains differed in their capacity to generate memory. This study therefore demonstrated that insecticide resistant phenotype affected the capacity of the two strains to generate immunological memory. Although this study needs to be replicated with wild mosquitoes, it does suggest that a potential role for insecticide resistance in the functioning of the immune system and memory generation of An. arabiensis.
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Affiliation(s)
- Nashrin F Patel
- Centre for Emerging Zoonotic and Parasitic Diseases, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2192, South Africa
- Wits Research Institute for Malaria, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 2193, South Africa
| | - Shüné V Oliver
- Centre for Emerging Zoonotic and Parasitic Diseases, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2192, South Africa
- Wits Research Institute for Malaria, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 2193, South Africa
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2
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Lanz-Mendoza H, Gálvez D, Contreras-Garduño J. The plasticity of immune memory in invertebrates. J Exp Biol 2024; 227:jeb246158. [PMID: 38449328 DOI: 10.1242/jeb.246158] [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] [Indexed: 03/08/2024]
Abstract
Whether specific immune protection after initial pathogen exposure (immune memory) occurs in invertebrates has long been uncertain. The absence of antibodies, B-cells and T-cells, and the short lifespans of invertebrates led to the hypothesis that immune memory does not occur in these organisms. However, research in the past two decades has supported the existence of immune memory in several invertebrate groups, including Ctenophora, Cnidaria, Nematoda, Mollusca and Arthropoda. Interestingly, some studies have demonstrated immune memory that is specific to the parasite strain. Nonetheless, other work does not provide support for immune memory in invertebrates or offers only partial support. Moreover, the expected biphasic immune response, a characteristic of adaptive immune memory in vertebrates, varies within and between invertebrate species. This variation may be attributed to the influence of biotic or abiotic factors, particularly parasites, on the outcome of immune memory. Despite its critical importance for survival, the role of phenotypic plasticity in immune memory has not been systematically examined in the past two decades. Additionally, the features of immune responses occurring in diverse environments have yet to be fully characterized.
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Affiliation(s)
- Humberto Lanz-Mendoza
- Centro de Investigaciones sobre Enfermedades Infecciosas, INSP, 62100 Cuernavaca, Morelos, Mexico
| | - Dumas Gálvez
- Coiba Scientific Station, City of Knowledge, Calle Gustavo Lara, Boulevard 145B, Clayton 0843-01853, Panama
- Programa Centroamericano de Maestría en Entomología, Universidad de Panamá, Estafeta universitaria, Avenida Simón Bolívar, 0824, Panama
- Sistema Nacional de Investigación, Edificio 205, Ciudad del Saber, 0816-02852, Panama
| | - Jorge Contreras-Garduño
- Escuela Nacional de Estudios Superiores, Unidad Morelia, UNAM, 58190 Morelia, Mexico
- Institute for Evolution and Biodiversity, University of Münster, 48149 Münster, Germany
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Li M, Zhou Y, Cheng J, Wang Y, Lan C, Shen Y. Response of the mosquito immune system and symbiotic bacteria to pathogen infection. Parasit Vectors 2024; 17:69. [PMID: 38368353 PMCID: PMC10874582 DOI: 10.1186/s13071-024-06161-4] [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: 12/01/2023] [Accepted: 01/24/2024] [Indexed: 02/19/2024] Open
Abstract
Mosquitoes are the deadliest animal in the word, transmitting a variety of insect-borne infectious diseases, such as malaria, dengue fever, yellow fever, and Zika, causing more deaths than any other vector-borne pathogen. Moreover, in the absence of effective drugs and vaccines to prevent and treat insect-borne diseases, mosquito control is particularly important as the primary measure. In recent decades, due to the gradual increase in mosquito resistance, increasing attention has fallen on the mechanisms and effects associated with pathogen infection. This review provides an overview of mosquito innate immune mechanisms in terms of physical and physiological barriers, pattern recognition receptors, signalling pathways, and cellular and humoral immunity, as well as the antipathogenic effects of mosquito symbiotic bacteria. This review contributes to an in-depth understanding of the interaction process between mosquitoes and pathogens and provides a theoretical basis for biological defence strategies against mosquito-borne infectious diseases.
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Affiliation(s)
- Manjin Li
- The Affiliated Wuxi Center for Disease Control and Prevention of Nanjing Medical University, Wuxi Center for Disease Control and Prevention, Wuxi, 214023, China
| | - Yang Zhou
- Nanjing Medical University, Nanjing, 211166, China
| | - Jin Cheng
- The Affiliated Wuxi Center for Disease Control and Prevention of Nanjing Medical University, Wuxi Center for Disease Control and Prevention, Wuxi, 214023, China
| | - Yiqing Wang
- The Affiliated Wuxi Center for Disease Control and Prevention of Nanjing Medical University, Wuxi Center for Disease Control and Prevention, Wuxi, 214023, China
| | - Cejie Lan
- The Affiliated Wuxi Center for Disease Control and Prevention of Nanjing Medical University, Wuxi Center for Disease Control and Prevention, Wuxi, 214023, China.
| | - Yuan Shen
- The Affiliated Wuxi Center for Disease Control and Prevention of Nanjing Medical University, Wuxi Center for Disease Control and Prevention, Wuxi, 214023, China.
- Nanjing Medical University, Nanjing, 211166, China.
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Ng TH, Harrison MC, Scharsack JP, Kurtz J. Disentangling specific and unspecific components of innate immune memory in a copepod-tapeworm system. Front Immunol 2024; 15:1307477. [PMID: 38348037 PMCID: PMC10859752 DOI: 10.3389/fimmu.2024.1307477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 01/02/2024] [Indexed: 02/15/2024] Open
Abstract
Evidence that the innate immune system can respond with forms of memory upon reinfection has been accumulating over the past few years. These phenomena of "immune priming" in invertebrates, and "trained immunity" in vertebrates, are contrary to previous belief that immune memory and specificity are restricted to the adaptive immune system. However, while trained immunity is usually a response with rather low specificity, immune priming has shown highly specific responses in certain species. To date, it is largely unknown how specificity in innate immune memory can be achieved in response to different parasite types. Here, we revisited a system where an exceptionally high degree of innate immune specificity had been demonstrated for the first time, consisting of the copepod Macrocyclops albidus and its natural parasite, the tapeworm Schistocephalus solidus. Using homologous (same family) vs. heterologous (different family) priming-challenge experiments, we first confirm that copepods exposed to the same parasite family benefit from reduced secondary infections. We further focused on exposed-but-not-infected copepods in primary exposure to employ a transcriptomic approach, distinguishing between immunity that was either specific or unspecific regarding the discrimination between tapeworm types. A weighted gene co-expression network (WGCN) revealed differences between specific and unspecific immunity; while both involved histone modification regulation, specific immunity involved gene-splicing factors, whereas unspecific immunity was primarily involved in metabolic shift. We found a functional enrichment in spliceosome in specific immunity, whereas oxidative phosphorylation and carbon metabolism were enriched in unspecific immunity. Our findings allow discrimination of specific and unspecific components of an innate immune memory, based on gene expression networks, and deepen our understanding of basic aspects of immune systems.
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Affiliation(s)
- Tze Hann Ng
- *Correspondence: Tze Hann Ng, ; Joachim Kurtz,
| | | | | | - Joachim Kurtz
- Institute for Evolution and Biodiversity, University of Münster, Münster, Germany
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Tang C, Kurata S, Fuse N. Re-recognition of innate immune memory as an integrated multidimensional concept. Microbiol Immunol 2023. [PMID: 37311618 DOI: 10.1111/1348-0421.13083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 05/25/2023] [Indexed: 06/15/2023]
Abstract
In the past decade, the concept of immunological memory, which has long been considered a phenomenon observed in the adaptive immunity of vertebrates, has been extended to the innate immune system of various organisms. This de novo immunological memory is mainly called "innate immune memory", "immune priming", or "trained immunity" and has received increased attention because of its potential for clinical and agricultural applications. However, research on different species, especially invertebrates and vertebrates, has caused controversy regarding this concept. Here we discuss the current studies focusing on this immunological memory and summarize several mechanisms underlying it. We propose "innate immune memory" as a multidimensional concept as an integration between the seemingly different immunological phenomena.
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Affiliation(s)
- Chang Tang
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Shoichiro Kurata
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Naoyuki Fuse
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
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Li Z, Jia L, Yi H, Guo G, Huang L, Zhang Y, Jiao Z, Wu J. Pre-exposure to Candida albicans induce trans-generational immune priming and gene expression of Musca domestica. Front Microbiol 2022; 13:902496. [PMID: 36238590 PMCID: PMC9551092 DOI: 10.3389/fmicb.2022.902496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 08/22/2022] [Indexed: 11/13/2022] Open
Abstract
Insects have the phenomenon of immune priming by which they can have enhanced protection against reinfection with the same pathogen, and this immune protection can be passed on to their offspring, which is defined as “trans-generational immune priming (TGIP).” But whether housefly possesses TGIP is still unclear. Therefore, we used the housefly as the insect model and Candida albicans as the pathogen to explore whether the housefly is capable of eliciting TGIP, and RNA sequencing (RNA-seq) was performed to explore the molecular mechanism of TGIP of the housefly. We found that the housefly possesses TGIP, and adults pre-exposed to heat-killed C. albicans could confer protection to itself and its offspring upon reinfection with a lethal dose of C. albicans. RNA-seq results showed that 30 and 154 genes were differentially expressed after adults were primed with heat-killed C. albicans (CA-A) and after offspring larvae were challenged with a lethal dose of C. albicans (CA-CA-G), respectively. Among the differentially expressed genes (DEGs), there were 23 immune genes, including 6 pattern recognition receptors (PRRs), 7 immune effectors, and 10 immunoregulatory molecules. More importantly, multiple DEGs were involved in the Toll signaling pathway and phagosome signaling pathway, suggesting that the Toll signaling pathway and phagocytosis might play important roles in the process of TGIP of housefly to C. albicans. Our results expanded on previous studies and provided parameters for exploring the mechanism of TGIP.
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Affiliation(s)
- Zhongxun Li
- School of Basic Medical Sciences, Guizhou Medical University, Guiyang, China
- Department of Clinical Laboratory, The Second People’s Hospital of Yibin, West China Yibin Hospital, Yibin, China
| | - Lina Jia
- School of Basic Medical Sciences, Guizhou Medical University, Guiyang, China
| | - Hong Yi
- Department of Pathology, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Guo Guo
- School of Basic Medical Sciences, Guizhou Medical University, Guiyang, China
| | - Li Huang
- School of Basic Medical Sciences, Guizhou Medical University, Guiyang, China
| | - Yingchun Zhang
- School of Basic Medical Sciences, Guizhou Medical University, Guiyang, China
| | - Zhenlong Jiao
- School of Basic Medical Sciences, Guizhou Medical University, Guiyang, China
- *Correspondence: Zhenlong Jiao,
| | - Jianwei Wu
- School of Basic Medical Sciences, Guizhou Medical University, Guiyang, China
- Jianwei Wu,
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Li Z, Jia L, Jiao Z, Guo G, Zhang Y, Xun H, Shang X, Huang L, Wu J. Immune priming with Candida albicans induces a shift in cellular immunity and gene expression of Musca domestica. Microb Pathog 2022; 168:105597. [DOI: 10.1016/j.micpath.2022.105597] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Revised: 04/20/2022] [Accepted: 05/16/2022] [Indexed: 12/11/2022]
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Kulkarni A, Pandey A, Trainor P, Carlisle S, Yu W, Kukutla P, Xu J. Aryl hydrocarbon receptor and Krüppel like factor 10 mediate a transcriptional axis modulating immune homeostasis in mosquitoes. Sci Rep 2022; 12:6005. [PMID: 35397616 PMCID: PMC8994780 DOI: 10.1038/s41598-022-09817-2] [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: 12/14/2021] [Accepted: 03/21/2022] [Indexed: 11/25/2022] Open
Abstract
Immune responses require delicate controls to maintain homeostasis while executing effective defense. Aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor. The Krüppel-like factor 10 (KLF10) is a C2H2 zinc-finger containing transcription factor. The functions of mosquito AhR and KLF10 have not been characterized. Here we show that AhR and KLF10 constitute a transcriptional axis to modulate immune responses in mosquito Anopheles gambiae. The manipulation of AhR activities via agonists or antagonists repressed or enhanced the mosquito antibacterial immunity, respectively. KLF10 was recognized as one of the AhR target genes in the context. Phenotypically, silencing KLF10 reversed the immune suppression caused by the AhR agonist. The transcriptome comparison revealed that silencing AhR and KLF10 plus challenge altered the expression of 2245 genes in the same way. The results suggest that KLF10 is downstream of AhR in a transcriptional network responsible for immunomodulation. This AhR–KLF10 axis regulates a set of genes involved in metabolism and circadian rhythms in the context. The axis was required to suppress the adverse effect caused by the overactivation of the immune pathway IMD via the inhibitor gene Caspar silencing without a bacterial challenge. These results demonstrate that the AhR–KLF10 axis mediates an immunoregulatory transcriptional network as a negative loop to maintain immune homeostasis.
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Affiliation(s)
- Aditi Kulkarni
- Biology Department, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Ashmita Pandey
- Biology Department, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Patrick Trainor
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Samantha Carlisle
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Wanqin Yu
- Biology Department, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Phanidhar Kukutla
- Biology Department, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Jiannong Xu
- Biology Department, New Mexico State University, Las Cruces, NM, 88003, USA.
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Barletta Ferreira AB, Bahia AC, Pitaluga AN, Barros E, Gama dos Santos D, Bottino-Rojas V, Kubota MS, Oliveira PLD, Pimenta PFP, Traub-Csekö YM, Sorgine MHF. Sexual Dimorphism in Immune Responses and Infection Resistance in Aedes aegypti and Other Hematophagous Insect Vectors. FRONTIERS IN TROPICAL DISEASES 2022. [DOI: 10.3389/fitd.2022.847109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Sexual dimorphism in immune function is prevalent across different species, where males trade their ability to fight pathogens for a practical reproductive function while females favor an extended lifespan. In insects, these differences in immune function reflect an evolutionary life strategy, where females have a presumably more robust immune system than insect males. Here, we evaluate immune functioning in four male and female insect vectors, Aedes aegypti (Diptera, Culicidae), Anopheles aquasalis (Diptera, Culicidae), Lutzomyia longipalpis (Diptera, Psychodidae) and Rhodnius prolixus (Hemiptera, Reduviidae). We show evidence that challenges the concept of immune sexual dimorphism in three of these insect vectors. In the three Diptera species, A. aegypti, A. aquasalis and L. longipalpis that transmit arboviruses, Plasmodium spp. (Haemospororida, Plasmodiidae) and Leishmania spp. (Trypanosomatida, Trypanosomatidae), respectively, unchallenged adult males express higher levels of immune-related genes than adult females and immature developmental stages. The main components of the Toll, IMD, and Jak/STAT pathways and antimicrobial effectors are highly expressed in whole-body males. Additionally, males present lower midgut basal microbiota levels than females. In A. aegypti mosquitoes, the differences in immune gene expression and microbiota levels are established in adult mosquitoes but are not present at the recently emerged adults and pupal stage. Antibiotic treatment does not affect the consistently higher expression of immune genes in males, except defensin, which is reduced significantly after microbiota depletion and restored after re-introduction. Our data suggest that Diptera males have a basal state of activation of the immune system and that activation of a more robust response through systemic immune challenge acutely compromises their survival. The ones who survive clear the infection entirely. Females follow a different strategy where a moderate immune reaction render higher tolerance to infection and survival. In contrast, hematophagous adult males of the Hemiptera vector R. prolixus, which transmits Trypanosoma cruzi, present no differences in immune activation compared to females, suggesting that diet differences between males and females may influence immune sexual dimorphism. These findings expand our understanding of the biology of insect vectors of human pathogens, which can help to direct the development of new strategies to limit vector populations.
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Lanz-Mendoza H, Contreras-Garduño J. Innate immune memory in invertebrates: Concept and potential mechanisms. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2022; 127:104285. [PMID: 34626688 DOI: 10.1016/j.dci.2021.104285] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 09/19/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
Invertebrates are the protagonists of a recent paradigm shift because they now show that vertebrates are not the only group with immune memory. This review discusses the concept of immune priming, its characteristics, and differences with trained immunity and immune enhancement. We include an update of the current status of immune priming within generations in different groups of invertebrates which now include work in 5 Phyla: Ctenophora, Cnidaria, Mollusca, Nematoda, and Arthropoda. Clearly, few Phyla have been studied. We also resume and discuss the effector mechanism related to immune memory, including integrating viral elements into the genome, endoreplication, and epigenetics. The roles of other elements are incorporated, such as hemocytes, immune pathways, and metabolisms. We conclude that taking care of the experimental procedure will discern if results provide or do not support the invertebrates' immune memory and that regarding mechanisms, indeed, there are no studies on the immune memory mechanisms, this is how specificity is reached, and how and where the immune memory is stored and how is recall upon subsequent encounters. Finally, we discuss the possibility of having more than one mechanism working in different groups of invertebrates depending on the environmental conditions.
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Affiliation(s)
- Humberto Lanz-Mendoza
- Centro de Investigaciones sobre Enfermedades Infecciosas, INSP, Cuernavaca, Morelos, Mexico.
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Liberti A, Natarajan O, Atkinson CGF, Dishaw LJ. Secreted immunoglobulin domain effector molecules of invertebrates and management of gut microbial ecology. Immunogenetics 2022; 74:99-109. [PMID: 34988622 DOI: 10.1007/s00251-021-01237-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 11/18/2021] [Indexed: 02/01/2023]
Abstract
The origins of a "pass-through" gut in early bilaterians facilitated the exploration of new habitats, motivated the innovation of feeding styles and behaviors, and helped drive the evolution of more complex organisms. The gastrointestinal tract has evolved to consist of a series of interwoven exchanges between nutrients, host immunity, and an often microbe-rich environmental interface. Not surprisingly, animals have expanded their immune repertoires to include soluble effectors that can be secreted into luminal spaces, e.g., in the gut, facilitating interactions with microbes in ways that influence their settlement dynamics, virulence, and their interaction with other microbes. The immunoglobulin (Ig) domain, which is also found in some non-immune molecules, is recognized as one of the most versatile recognition domains lying at the interface of innate and adaptive immunity; among vertebrates, secreted Igs are known to play crucial roles in the management of gut microbial communities. In this mini-review, we will focus on secreted immune effectors possessing Ig-like domains in invertebrates, such as the fibrinogen-related effector proteins first described in the gastropod Biomphalaria glabrata, the Down syndrome cellular adhesion molecule first described in the arthropod, Drosophila melanogaster, and the variable region-containing chitin-binding proteins of the protochordates. We will highlight our current understanding of their function and their potential role, if not yet recognized, in the establishment and maintenance of host-microbial interfaces and argue that these Igs are likely also essential to microbiome management.
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Affiliation(s)
- Assunta Liberti
- Biology and Evolution of Marine Organisms (BEOM), Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Ojas Natarajan
- Department of Pediatrics, Morsani College of Medicine, University of South Florida, Tampa, FL, USA.,Division of Molecular Genetics, Children's Research Institute, St. Petersburg, FL, USA
| | - Celine Grace F Atkinson
- Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, Tampa, FL, USA.,Division of Molecular Genetics, Children's Research Institute, St. Petersburg, FL, USA
| | - Larry J Dishaw
- Department of Pediatrics, Morsani College of Medicine, University of South Florida, Tampa, FL, USA. .,Division of Molecular Genetics, Children's Research Institute, St. Petersburg, FL, USA.
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