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Ribeiro JM, Hartmann D, Bartošová-Sojková P, Debat H, Moos M, Šimek P, Fara J, Palus M, Kučera M, Hajdušek O, Sojka D, Kopáček P, Perner J. Blood-feeding adaptations and virome assessment of the poultry red mite Dermanyssus gallinae guided by RNA-seq. Commun Biol 2023; 6:517. [PMID: 37179447 PMCID: PMC10183022 DOI: 10.1038/s42003-023-04907-x] [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: 05/20/2022] [Accepted: 05/03/2023] [Indexed: 05/15/2023] Open
Abstract
Dermanyssus gallinae is a blood-feeding mite that parasitises wild birds and farmed poultry. Its remarkably swift processing of blood, together with the capacity to blood-feed during most developmental stages, makes this mite a highly debilitating pest. To identify specific adaptations to digestion of a haemoglobin-rich diet, we constructed and compared transcriptomes from starved and blood-fed stages of the parasite and identified midgut-enriched transcripts. We noted that midgut transcripts encoding cysteine proteases were upregulated with a blood meal. Mapping the full proteolytic apparatus, we noted a reduction in the suite of cysteine proteases, missing homologues for Cathepsin B and C. We have further identified and phylogenetically analysed three distinct transcripts encoding vitellogenins that facilitate the reproductive capacity of the mites. We also fully mapped transcripts for haem biosynthesis and the ferritin-based system of iron storage and inter-tissue trafficking. Additionally, we identified transcripts encoding proteins implicated in immune signalling (Toll and IMD pathways) and activity (defensins and thioester-containing proteins), RNAi, and ion channelling (with targets for commercial acaricides such as Fluralaner, Fipronil, and Ivermectin). Viral sequences were filtered from the Illumina reads and we described, in part, the RNA-virome of D. gallinae with identification of a novel virus, Red mite quaranjavirus 1.
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Affiliation(s)
- José M Ribeiro
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, Bethesda, MD, USA
| | - David Hartmann
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic
| | - Pavla Bartošová-Sojková
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic
| | - Humberto Debat
- Instituto de Patología Vegetal, Centro de Investigaciones Agropecuarias, Instituto Nacional de Tecnología Agropecuaria (IPAVE-CIAP-INTA), Córdoba, Argentina
| | - Martin Moos
- Institute of Entomology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic
| | - Petr Šimek
- Institute of Entomology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic
| | - Jiří Fara
- International Poultry Testing Station Ústrašice, Ústrašice, Czech Republic
| | - Martin Palus
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic
| | - Matěj Kučera
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic
| | - Ondřej Hajdušek
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic
| | - Daniel Sojka
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic
| | - Petr Kopáček
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic
| | - Jan Perner
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 37005, České Budějovice, Czech Republic.
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Khan A, Sohaib M, Ullah R, Hussain I, Niaz S, Malak N, de la Fuente J, Khan A, Aguilar-Marcelino L, Alanazi AD, Ben Said M. Structure-based in silico design and in vitro acaricidal activity assessment of Acacia nilotica and Psidium guajava extracts against Sarcoptes scabiei var. cuniculi. Parasitol Res 2022; 121:2901-2915. [PMID: 35972548 DOI: 10.1007/s00436-022-07615-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 07/31/2022] [Indexed: 12/01/2022]
Abstract
Infestation by Sarcoptes scabiei var. cuniculi mite causes scabies in humans and mange in animals. Alternative methods for developing environmentally friendly and effective plant-based acaricides are now a priority. The purpose of this research was the in silico design and in vitro evaluation of the efficacy of ethanol extracts of Acacia nilotica and Psidium guajava plant leaves against S. scabiei. Chem-Draw ultra-software (v. 12.0.2.1076.2010) was used to draw 36 distinct compounds from these plants that were employed as ligands in docking tests against S. scabiei Aspartic protease (SsAP). With docking scores of - 6.50993 and - 6.16359, respectively, clionasterol (PubChem CID 457801) and mangiferin (PubChem CID 5281647) from A. nilotica inhibited the targeted protein SsAP, while only beta-sitosterol (PubChem CID 222284) from P. guajava interacted with the SsAP active site with a docking score of - 6.20532. Mortality in contact bioassay at concentrations of 0.25, 0.5, 1.0, and 2.0 g/ml was determined to calculate median lethal time (LT50) and median lethal concentration (LC50) values. Acacia nilotica extract had an LC50 value of 0.218 g/ml compared to P. guajava extract, which had an LC50 value of 0.829 g/ml at 6 h. These results suggest that A. nilotica extract is more effective in killing mites, and these plants may have novel acaricidal properties against S. scabiei. Further research should focus on A. nilotica as a potential substitute for clinically available acaricides against resistant mites.
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Affiliation(s)
- Afshan Khan
- Department of Zoology, Abdul Wali Khan University Mardan, Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Muhammad Sohaib
- Department of Zoology, Abdul Wali Khan University Mardan, Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Rooh Ullah
- Department of Zoology, Abdul Wali Khan University Mardan, Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Imdad Hussain
- Department of Zoology, Abdul Wali Khan University Mardan, Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Sadaf Niaz
- Department of Zoology, Abdul Wali Khan University Mardan, Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Nosheen Malak
- Department of Zoology, Abdul Wali Khan University Mardan, Mardan, Khyber Pakhtunkhwa, Pakistan
| | - José de la Fuente
- SaBio. Instituto de Investigación en Recursos Cinegéticos IREC-CSIC-UCLM-JCCM, Ronda de Toledo s/n, 13005, Ciudad Real, Spain.,Department of Veterinary Pathobiology, Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, OK, 74078, USA
| | - Adil Khan
- Department of Zoology, Bacha Khan University Charsadda, Charsadda, Khyber Pakhtunkhwa, Pakistan.
| | - Liliana Aguilar-Marcelino
- National Center for Disciplinary Research in Animal Health and Safety (INIFAP), Km 11 Federal Road Cuernavaca-Cuautla, 62550, Jiutepec, Morelos, México
| | - Abdullah D Alanazi
- Department of Biological Sciences, Faculty of Science and Humanities, Shaqra University, 1040 Ad-Dawadimi, 11911, Shaqra, Saudi Arabia
| | - Mourad Ben Said
- Department of Basic Sciences, Higher Institute of Biotechnology of Sidi Thabet, University of Manouba, 2010, Manouba, Tunisia.,Laboratory of Microbiology, National School of Veterinary Medicine of Sidi Thabet, University of Manouba, 2010, Manouba, Tunisia
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3
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Xu X, Wang C, Liu Q, Huang Y, Sun W, Pan B. Two ferritins from Dermanyssus gallinae: characterization and in vivo assessment as protective antigens. PEST MANAGEMENT SCIENCE 2022; 78:561-571. [PMID: 34595835 DOI: 10.1002/ps.6664] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 09/04/2021] [Accepted: 09/30/2021] [Indexed: 05/27/2023]
Abstract
BACKGROUND The poultry red mite, Dermanyssus gallinae is recognized worldwide as the most important bloodsucking ectoparasite in layer and breeder flocks. In bloodsucking ectoparasites, ferritins (FERs), the iron-storage proteins, play a pivotal role in dealing with the challenge of large amounts of released iron during the digestion of blood meal. However, no information is available concerning FERs of D. gallinae. The aim of the present study was to investigate the characteristics, functions and the vaccine efficacy of FERs in D. gallinae. RESULTS Two heavy-chain FERs of D. gallinae were identified and characterized. Phylogenetic analysis indicated that Dg-FER1 may be a secretory FER and Dg-FER2 an intracellular one. RNAi results demonstrated that Dg-fers play key roles in mite survival, successful reproduction and blood digestion. Immunization with rDg-FER1 or rDg-FER2 successfully induced chickens to produce high levels of antigen-specific IgY, resulting in a significant increase in mite mortality (by 58.67% on Day 5) and decreases in oviposition (by 42.15%) and fecundity (by 68.97%) in the rDg-FER1 group, and a 13.73% increase in mite mortality and a 20.89% decrease in fecundity in the rDg-FER1 group. The overall immunization efficacy of rDg-FER1 was 93.51%. CONCLUSION Two Dg-FERs are crucial to the survival, reproduction and blood digestion of D. gallinae. This study has provided preliminary evidence demonstrating the potential of rDg-FER1 as a vaccine antigen for D. gallinae. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Xiaolin Xu
- Department of Veterinary Parasitology, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Chuanwen Wang
- Department of Veterinary Parasitology, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Qi Liu
- Department of Veterinary Parasitology, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Yu Huang
- Department of Veterinary Parasitology, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Weiwei Sun
- Department of Veterinary Parasitology, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Baoliang Pan
- Department of Veterinary Parasitology, College of Veterinary Medicine, China Agricultural University, Beijing, China
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Genomic insight into the scale specialization of the biological control agent Novius pumilus (Weise, 1892). BMC Genomics 2022; 23:90. [PMID: 35100986 PMCID: PMC8805230 DOI: 10.1186/s12864-022-08299-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Accepted: 01/10/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Members of the genus Novius Mulsant, 1846 (= Rodolia Mulsant, 1850) (Coleoptera, Coccinellidae), play important roles in the biological control of cotton cushion scale pests, especially those belonging to Icerya. Since the best-known species, the vedalia beetle Novius cardinalis (Mulsant, 1850) was introduced into California from Australia, more than a century of successful use in classical biological control, some species of Novius have begun to exhibit some field adaptations to novel but related prey species. Despite their economic importance, relatively little is known about the underlying genetic adaptations associated with their feeding habits. Knowledge of the genome sequence of Novius is a major step towards further understanding its biology and potential applications in pest control. RESULTS We report the first high-quality genome sequence for Novius pumilus (Weise, 1892), a representative specialist of Novius. Computational Analysis of gene Family Evolution (CAFE) analysis showed that several orthogroups encoding chemosensors, digestive, and immunity-related enzymes were significantly expanded (P < 0.05) in N. pumilus compared to the published genomes of other four ladybirds. Furthermore, some of these orthogroups were under significant positive selection pressure (P < 0.05). Notably, transcriptome profiling demonstrated that many genes among the significantly expanded and positively selected orthogroups, as well as genes related to detoxification were differentially expressed, when N. pumilus feeding on the nature prey Icerya compared with the no feeding set. We speculate that these genes are vital in the Icerya adaptation of Novius species. CONCLUSIONS We report the first Novius genome thus far. In addition, we provide comprehensive transcriptomic resources for N. pumilus. The results from this study may be helpful for understanding the association of the evolution of genes related to chemosensing, digestion, detoxification and immunity with the prey adaptation of insect predators. This will provide a reference for future research and utilization of Novius in biological control programs. Moreover, understanding the possible molecular mechanisms of prey adaptation also inform mass rearing of N. pumilus and other Novius, which may benefit pest control.
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Schiavone A, Pugliese N, Otranto D, Samarelli R, Circella E, De Virgilio C, Camarda A. Dermanyssus gallinae: the long journey of the poultry red mite to become a vector. Parasit Vectors 2022; 15:29. [PMID: 35057849 PMCID: PMC8772161 DOI: 10.1186/s13071-021-05142-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 12/22/2021] [Indexed: 11/18/2022] Open
Abstract
The possibility that Dermanyssus gallinae, the poultry red mite, could act as a vector of infectious disease-causing pathogens has always intrigued researchers and worried commercial chicken farmers, as has its ubiquitous distribution. For decades, studies have been carried out which suggest that there is an association between a wide range of pathogens and D. gallinae, with the transmission of some of these pathogens mediated by D. gallinae as vector. The latter include the avian pathogenic Escherichia coli (APEC), Salmonella enterica serovars Enteritidis and Gallinarum and influenza virus. Several approaches have been adopted to investigate the relationship between D. gallinae and pathogens. In this comprehensive review, we critically describe available strategies and methods currently available for conducting trials, as well as outcomes, analyzing their possible strengths and weaknesses, with the aim to provide researchers with useful tools for correctly approach the study of the vectorial role of D. gallinae.
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Huo SM, Yan ZC, Zhang F, Chen L, Sun JT, Hoffmann AA, Hong XY. Comparative genome and transcriptome analyses reveal innate differences in response to host plants by two color forms of the two-spotted spider mite Tetranychus urticae. BMC Genomics 2021; 22:569. [PMID: 34301178 PMCID: PMC8306301 DOI: 10.1186/s12864-021-07894-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 07/08/2021] [Indexed: 12/26/2022] Open
Abstract
Background The two-spotted spider mite, Tetranychus urticae, is a major agricultural pest with a cosmopolitan distribution, and its polyphagous habits provide a model for investigating herbivore-plant interactions. There are two body color forms of T. urticae with a different host preference. Comparative genomics and transcriptomics are used here to investigate differences in responses of the forms to host plants at the molecular level. Biological responses of the two forms sourced from multiple populations are also presented. Results We carried out principal component analysis of transcription changes in three red and three green T. urticae populations feeding on their original host (common bean), and three hosts to which they were transferred: cotton, cucumber and eggplant. There were differences among the forms in gene expression regardless of their host plant. In addition, different changes in gene expression were evident in the two forms when responding to the same host transfer. We further compared biological performance among populations of the two forms after feeding on each of the four hosts. Fecundity of 2-day-old adult females showed a consistent difference between the forms after feeding on bean. We produced a 90.1-Mb genome of the red form of T. urticae with scaffold N50 of 12.78 Mb. Transcriptional profiles of genes associated with saliva, digestion and detoxification showed form-dependent responses to the same host and these genes also showed host-specific expression effects. Conclusions Our research revealed that forms of T. urticae differ in host-determined transcription responses and that there is form-dependent plasticity in the transcriptomic responses. These differences may facilitate the extreme polyphagy shown by spider mites, although fitness differences on hosts are also influenced by population differences unrelated to color form. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-021-07894-7.
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Affiliation(s)
- Shi-Mei Huo
- Department of Entomology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, China
| | - Zhi-Chao Yan
- Department of Entomology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, China
| | - Feng Zhang
- Department of Entomology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, China
| | - Lei Chen
- Department of Entomology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, China
| | - Jing-Tao Sun
- Department of Entomology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, China
| | - Ary A Hoffmann
- School of BioSciences, Bio21 Institute, The University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Xiao-Yue Hong
- Department of Entomology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, China.
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7
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Bartley K, Chen W, Lloyd Mills RI, Nunn F, Price DRG, Rombauts S, Van de Peer Y, Roy L, Nisbet AJ, Burgess STG. Transcriptomic analysis of the poultry red mite, Dermanyssus gallinae, across all stages of the lifecycle. BMC Genomics 2021; 22:248. [PMID: 33827430 PMCID: PMC8028124 DOI: 10.1186/s12864-021-07547-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 03/17/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The blood feeding poultry red mite (PRM), Dermanyssus gallinae, causes substantial economic damage to the egg laying industry worldwide, and is a serious welfare concern for laying hens and poultry house workers. In this study we have investigated the temporal gene expression across the 6 stages/sexes (egg, larvae, protonymph and deutonymph, adult male and adult female) of this neglected parasite in order to understand the temporal expression associated with development, parasitic lifestyle, reproduction and allergen expression. RESULTS RNA-seq transcript data for the 6 stages were mapped to the PRM genome creating a publicly available gene expression atlas (on the OrcAE platform in conjunction with the PRM genome). Network analysis and clustering of stage-enriched gene expression in PRM resulted in 17 superclusters with stage-specific or multi-stage expression profiles. The 6 stage specific superclusters were clearly demarked from each other and the adult female supercluster contained the most stage specific transcripts (2725), whilst the protonymph supercluster the fewest (165). Fifteen pairwise comparisons performed between the different stages resulted in a total of 6025 Differentially Expressed Genes (DEGs) (P > 0.99). These data were evaluated alongside a Venn/Euler analysis of the top 100 most abundant genes in each stage. An expanded set of cuticle proteins and enzymes (chitinase and metallocarboxypeptidases) were identified in larvae and underpin cuticle formation and ecdysis to the protonymph stage. Two mucin/peritrophic-A salivary proteins (DEGAL6771g00070, DEGAL6824g00220) were highly expressed in the blood-feeding stages, indicating peritrophic membrane formation during feeding. Reproduction-associated vitellogenins were the most abundant transcripts in adult females whilst, in adult males, an expanded set of serine and cysteine proteinases and an epididymal protein (DEGAL6668g00010) were highly abundant. Assessment of the expression patterns of putative homologues of 32 allergen groups from house dust mites indicated a bias in their expression towards the non-feeding larval stage of PRM. CONCLUSIONS This study is the first evaluation of temporal gene expression across all stages of PRM and has provided insight into developmental, feeding, reproduction and survival strategies employed by this mite. The publicly available PRM resource on OrcAE offers a valuable tool for researchers investigating the biology and novel interventions of this parasite.
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Affiliation(s)
- Kathryn Bartley
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK.
| | - Wan Chen
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK
- Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Aberdeen, AB24 3FX, UK
| | | | - Francesca Nunn
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK
| | - Daniel R G Price
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK
| | - Stephane Rombauts
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 927, 9052, Ghent, Belgium
- Bioinformatics Institute Ghent, Ghent University, 9052, Ghent, Belgium
| | - Yves Van de Peer
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 927, 9052, Ghent, Belgium
- Bioinformatics Institute Ghent, Ghent University, 9052, Ghent, Belgium
- Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Private bag X20, Pretoria, 0028, South Africa
| | - Lise Roy
- CEFE, CNRS, Univ Montpellier, Univ Paul Valéry Montpellier, EPHE, IRD, Montpellier, France
| | - Alasdair J Nisbet
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK
| | - Stewart T G Burgess
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK
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Evaluation of the vaccine efficacy of three digestive protease antigens from Dermanyssus gallinae using an in vivo rearing system. Vaccine 2020; 38:7842-7849. [PMID: 33164806 DOI: 10.1016/j.vaccine.2020.10.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 09/28/2020] [Accepted: 10/06/2020] [Indexed: 11/22/2022]
Abstract
The poultry red mite (PRM), Dermanyssus gallinae, is a hematophagous ectoparasite considered as the major pest in the egg-laying industry. Vaccination is feasible strategy for controlling the haematophagous PRMs. Cathepsin D (CatD), cathepsin L (CatL) and legumain (Lgm) are three endopeptidases participating in digestion of hemoglobin in ticks. The in vitro test and the on-hen feeding device have been used to evaluate the efficacy of vaccines against D. gallinae, however they lacked some of the natural feeding cues for mites, resulting in unreliable results. In the present study, a reliable in vivo rearing system which was nearly close to the natural infestation status of mites was applied to evaluate the efficacy of vaccines against D. gallinae. After vaccinations with rDg-CatD-1, rDg-CatL-1 or rDg-Lgm, chicks developed the antigen-specific IgY immune response to each antigen. The survival rates of D. gallinae in three groups decreased significantly after they fed on the immunized birds. And the oviposition rate and fecundity were significantly reduced by 13.18% and 49.90% in the rDg-CatD-1 immunized group, 5.49% and 38.55% in the rDg-CatL-1 immunized group, respectively. Moreover, immunization with rDg-CatD-1 or rDg-CatL-1 significantly decreased the blood digestion rate of D. gallinae. However, no statistically significant effects on reproduction performance and blood digestion rate of mite were observed in group immunized with rDg-Lgm. Our results demonstrated that immunization with rDg-CatD-1 or rDg-CatL-1 could prevent and control D. gallinae by reducing the survival, reproductive capacity and blood digestion of mite. Importantly, the evaluation system based on the in vivo rearing system was reliable and practical, and it can accurately evaluate the effects of immunization on D. gallinae for pre-screening of potential novel antigens.
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9
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Fernando DD, Fischer K. Proteases and pseudoproteases in parasitic arthropods of clinical importance. FEBS J 2020; 287:4284-4299. [PMID: 32893448 DOI: 10.1111/febs.15546] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 08/18/2020] [Accepted: 08/28/2020] [Indexed: 12/19/2022]
Abstract
Parasitic arthropods feed on blood or skin tissue and share comparable repertoires of proteases involved in haematophagy, digestion, egg development and immunity. While proteolytically active proteases of multiple classes dominate, an increasing number of pseudoproteases have been discovered that have no proteolytic function but are pharmacologically active biomolecules, evolved to carry out alternative functions as regulatory, antihaemostatic, anti-inflammatory or immunomodulatory compounds. In this review, we provide an overview of proteases and pseudoproteases from clinically important arthropod parasites. Many of these act in central biological pathways of parasite survival and host-parasite interaction and may be potential targets for therapeutic interventions.
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Affiliation(s)
- Deepani Darshika Fernando
- Cell and Molecular Biology Department, Infectious Diseases Program, QIMR Berghofer Medical Research Institute, Brisbane, Qld, Australia
| | - Katja Fischer
- Cell and Molecular Biology Department, Infectious Diseases Program, QIMR Berghofer Medical Research Institute, Brisbane, Qld, Australia
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10
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Burgess STG, Marr EJ, Bartley K, Nunn FG, Down RE, Weaver RJ, Prickett JC, Dunn J, Rombauts S, Van Leeuwen T, Van de Peer Y, Nisbet AJ. A genomic analysis and transcriptomic atlas of gene expression in Psoroptes ovis reveals feeding- and stage-specific patterns of allergen expression. BMC Genomics 2019; 20:756. [PMID: 31640546 PMCID: PMC6806590 DOI: 10.1186/s12864-019-6082-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 09/05/2019] [Indexed: 02/04/2023] Open
Abstract
Background Psoroptic mange, caused by infestation with the ectoparasitic mite, Psoroptes ovis, is highly contagious, resulting in intense pruritus and represents a major welfare and economic concern for the livestock industry Worldwide. Control relies on injectable endectocides and organophosphate dips, but concerns over residues, environmental contamination, and the development of resistance threaten the sustainability of this approach, highlighting interest in alternative control methods. However, development of vaccines and identification of chemotherapeutic targets is hampered by the lack of P. ovis transcriptomic and genomic resources. Results Building on the recent publication of the P. ovis draft genome, here we present a genomic analysis and transcriptomic atlas of gene expression in P. ovis revealing feeding- and stage-specific patterns of gene expression, including novel multigene families and allergens. Network-based clustering revealed 14 gene clusters demonstrating either single- or multi-stage specific gene expression patterns, with 3075 female-specific, 890 male-specific and 112, 217 and 526 transcripts showing larval, protonymph and tritonymph specific-expression, respectively. Detailed analysis of P. ovis allergens revealed stage-specific patterns of allergen gene expression, many of which were also enriched in “fed” mites and tritonymphs, highlighting an important feeding-related allergenicity in this developmental stage. Pair-wise analysis of differential expression between life-cycle stages identified patterns of sex-biased gene expression and also identified novel P. ovis multigene families including known allergens and novel genes with high levels of stage-specific expression. Conclusions The genomic and transcriptomic atlas described here represents a unique resource for the acarid-research community, whilst the OrcAE platform makes this freely available, facilitating further community-led curation of the draft P. ovis genome.
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Affiliation(s)
- Stewart T G Burgess
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK.
| | - Edward J Marr
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK
| | - Kathryn Bartley
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK
| | - Francesca G Nunn
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK
| | | | | | | | - Jackie Dunn
- Fera Science Ltd, Sand Hutton, York, YO41 1LZ, UK
| | - Stephane Rombauts
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, 9052, Ghent, Belgium.,VIB Center for Plant Systems Biology, Technologiepark 927, 9052, Ghent, Belgium.,Bioinformatics Institute Ghent, Ghent University, 9052, Ghent, Belgium
| | - Thomas Van Leeuwen
- Department of Plants and Crops, Ghent University, Coupure links 653, B-9000, Ghent, Belgium
| | - Yves Van de Peer
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, 9052, Ghent, Belgium.,VIB Center for Plant Systems Biology, Technologiepark 927, 9052, Ghent, Belgium.,Bioinformatics Institute Ghent, Ghent University, 9052, Ghent, Belgium.,Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Private bag X20, Pretoria, 0028, South Africa
| | - Alasdair J Nisbet
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian, EH26 0PZ, UK
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11
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Price DRG, Küster T, Øines Ø, Oliver EM, Bartley K, Nunn F, Lima Barbero JF, Pritchard J, Karp-Tatham E, Hauge H, Blake DP, Tomley FM, Nisbet AJ. Evaluation of vaccine delivery systems for inducing long-lived antibody responses to Dermanyssus gallinae antigen in laying hens. Avian Pathol 2019; 48:S60-S74. [PMID: 31032631 DOI: 10.1080/03079457.2019.1612514] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Dermanyssus gallinae, the poultry red mite, is a global threat to the commercial egg-laying industry. Control of D. gallinae is difficult, with only a limited number of effective pesticides and non-chemical treatments available. Here, we characterize the candidate vaccine antigen D. gallinae cathepsin D-1 (Dg-CatD-1) and demonstrate that purified refolded recombinant Dg-Cat-D1 (rDg-CatD-1) is an active aspartyl proteinase which digests haemoglobin with a pH optimum of pH 4. Soluble protein extracts from D. gallinae also have haemoglobinase activity, with a pH optimum comparable to the recombinant protein, and both proteinase activities were inhibited by the aspartyl proteinase inhibitor Pepstatin A. Enzyme activity and the ubiquitous localization of Dg-CatD-1 protein in sections of adult female mites is consistent with Dg-CatD-1 being a lysosomal proteinase. Using Dg-CatD-1 as a model vaccine antigen, we compared vaccine delivery methods in laying hens via vaccination with: (i) purified rDg-CatD-1 with Montanide™ ISA 71 VG adjuvant; (ii) recombinant DNA vaccines for expression of rDg-CatD-1 and (iii) transgenic coccidial parasite Eimeria tenella expressing rDg-CatD-1. In two independent trials, only birds vaccinated with rDg-CatD-1 with Montanide™ ISA 71 VG produced a strong and long-lasting serum anti-rDg-Cat-D1 IgY response, which was significantly higher than that in control birds vaccinated with adjuvant only. Furthermore, we showed that egg-laying rates of D. gallinae mites fed on birds vaccinated with rDg-CatD-1 in Montanide™ ISA 71 VG was reduced significantly compared with mites fed on unvaccinated birds. RESEARCH HIGHLIGHTS Dermanyssus gallinae cathepsin D-1 (Dg-CatD-1) digests haemoglobin Vaccination of hens with rDg-CatD-1 in Montanide™ ISA 71 VG results in long-lasting IgY levels Serum anti-rDg-CatD-1 antibodies reduce egg laying in D. gallinae after a single blood meal.
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Affiliation(s)
- Daniel R G Price
- Moredun Research Institute, Pentlands Science Park , Edinburgh , UK
| | - Tatiana Küster
- Pathobiology and Population Sciences, Royal Veterinary College , North Mymms , UK
| | | | | | - Kathryn Bartley
- Moredun Research Institute, Pentlands Science Park , Edinburgh , UK
| | - Francesca Nunn
- Moredun Research Institute, Pentlands Science Park , Edinburgh , UK
| | | | - James Pritchard
- Pathobiology and Population Sciences, Royal Veterinary College , North Mymms , UK
| | - Eleanor Karp-Tatham
- Pathobiology and Population Sciences, Royal Veterinary College , North Mymms , UK
| | | | - Damer P Blake
- Pathobiology and Population Sciences, Royal Veterinary College , North Mymms , UK
| | - Fiona M Tomley
- Pathobiology and Population Sciences, Royal Veterinary College , North Mymms , UK
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12
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Bowman CE. The gut epithelium from feeding to fasting in the predatory soil mite Pergamasus longicornis (Mesostigmata: Parasitidae): one tissue, two roles. EXPERIMENTAL & APPLIED ACAROLOGY 2019; 77:253-357. [PMID: 30895556 DOI: 10.1007/s10493-019-00356-6] [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: 08/06/2018] [Accepted: 02/27/2019] [Indexed: 06/09/2023]
Abstract
A review of acarine gut physiology based on published narratives dispersed over the historical international literature is given. Then, in an experimental study of the free-living predatory soil mite Pergamasus longicornis (Berlese), quantitative micro-anatomical changes in the gut epithelium are critically assessed from a temporal series of histological sections during and after feeding on larval dipteran prey. An argued functional synthesis based upon comparative kinetics is offered for verification in other mesostigmatids. Mid- and hind-gut epithelia cell types interconvert in a rational way dependent upon the physical consequences of ingestion, absorption and egestion. The fasted transitional pseudo-stratified epithelium rapidly becomes first squamous on prey ingestion (by stretching), then columnar during digestion before confirmed partial disintegration (gut 'lumenation') during egestion back to a pseudo-stratified state. Exponential processes within the mid- and endodermic hind-gut exhibit 'stiff' dynamics. Cells expand rapidly ([Formula: see text] 22.9-49.5 min) and vacuolate quickly ([Formula: see text] 1.1 h). Cells shrink very slowly ([Formula: see text] 4.9 days) and devacuolate gently ([Formula: see text] 1.0-1.7 days). Egestive cellular degeneration has an initial [Formula: see text] 7.7 h. Digestion appears to be triggered by maximum gut expansion-estimated at 10 min post start of feeding. Synchrony with changes in gut lumen contents suggests common changes in physiological function over time for the cells as a whole tightly-coupled epithelium. Distinct in architecture as a tissue over time the various constituent cell types appear functionally the same. Functional phases are: early fluid transportation (0-1 h) and extracellular activity (10-90 min); through rising food absorption (10 min to [Formula: see text] day); to slow intracellular meal processing and degenerative egestive waste material production (1 to [Formula: see text] days) much as in ticks. The same epithelium is both absorptive and degenerative in role. The switch in predominant physiology begins 4 h after the start of feeding. Two separate pulses of clavate cells appear to be a mechanism to facilitate transport by increasing epithelial surface area in contact with the lumen. Free-floating cells may augment early extracellular lumenal digestion. Possible evidence for salivary enzyme alkaline-related extra-corporeal digestion was found. Giant mycetome-like cells were found embedded in the mid-gut wall. Anteriorly, the mid-gut behaves like a temporally expendable food processing tissue and minor long-term resistive store. Posteriorly the mid-gut behaves like a major assimilative/catabolic tissue and 'last-out' food depot (i.e., a 'hepatopancreas' function) allowing the mite to resist starvation for up to 3.5 weeks after a single meal. A 'conveyor-belt' wave of physiology (i.e., feeding and digestion, then egestion and excretion) sweeps posteriorly but not necessarily pygidially over time. Assimilation efficiency is estimated at 82%. The total feeding cycle time histologically from a single meal allowing for the bulk of intracellular digestion and egestive release is not 52.5 h but of the order of 6 days ([Formula: see text] total gut emptyings per day), plus typically a further 3 days for subsequent excretion to occur. Final complete gut system clearance in this cryptozooid may take much longer ([Formula: see text] days). A common physiology across the anactinotrichid acarines is proposed. A look to the future of this field is included.
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Affiliation(s)
- Clive E Bowman
- Mathematical Institute, University of Oxford, Oxford, OX2 6GG, United Kingdom.
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13
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Esterase Profile in Drosophila mercatorum pararepleta (Diptera; Drosophilidae), a Non-cactophilic Species of the repleta Group: Development Patterns and Aspects of Genetic Variability. Zool Stud 2017; 56:e21. [PMID: 31966220 DOI: 10.6620/zs.2017.56-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2017] [Accepted: 07/11/2017] [Indexed: 11/18/2022]
Abstract
Luciana Paes de Barros Machado, Natalia Silva Alves, Jaqueline de Oliveira Prestes, Gabriela Ronchi Salomón, Daiane Biegai, Thais Wouk, and Rogério Pincela Mateus (2017) Esterases are a diversified group of isozymes that performs several metabolic functions in Drosophila. In the D. repleta group, this class of enzymes was well described in cactophilic species, existing a lack of studies considering substrate speci city and life cycle expression in the non-cactophilic species. The larvae of cactophilic species of the D. repleta group develop in rotting cacti cladodes, but adults are generalists. Thus, different patterns expression can be found for esterases throughout development. In this work we analyzed esterase pro le and substrate speci city during development, and genetic variability aspects in D. mercatorum pararepleta, a non-cactophilic and generalist species of D. repleta group that was understudied hitherto. Samples of 3rd (F3) and 104th (F104) generations of three D. mercatorum pararepleta strains, obtained after collections in xerophytic enclaves of southeastern Brazil (ITI and SER in São Paulo state and RIP in Paraná state), and of D33 strain (obtained from Cristalina-GO, Midwest of Brazil, and established in the laboratory in 1987) were analyzed. Eight esterase loci, EST-1 to EST-8, were detected. EST-1 and EST-2 were adult exclusive. Only EST-3 and EST-8 were monomorphic; all the others presented between two (EST-6) and six (EST-7) alleles. EST-7 was the only dimeric locus and also the only one that showed to be a preferably β-esterase regarding affinity to α- and β-naphthyl acetates as substrates. The other seven loci were divided into three classes: α-esterase exclusive (EST-2); preferably α-esterase (EST-3, EST-4, EST-5 and EST-8); and α/β-esterase (EST-1 and EST-6). The EST-3, EST-5 and EST-6 loci were not detected in all samples, suggesting that they could have become pseudogenes due to the mutation accumulation after the gene duplication. The allele frequency of EST-7 locus, which showed the highest number of alleles, in adults of D33 and SER-F3 evidenced a higher variability and diversity in the oldest strain (six alleles, Ho = 0.46) than in the youngest ( five alleles, Ho = 0.26). Moreover, the analysis of SER-F104 revealed that this locus became monomorphic. The higher variability in the strain established in the laboratory at least two decades ago, together with the allele fixation in the SER-F104, indicate that the SER strain probably suffered a more severe action of founder effect/bottleneck when it was established in the laboratory and, therefore, even if the maintenance afterwards was performed using a high number of individuals, it did not assured the conservation of the existing genetic variability.
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14
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Arlian LG, Morgan MS, Rider SD. Sarcoptes scabiei: genomics to proteomics to biology. Parasit Vectors 2016; 9:380. [PMID: 27371026 PMCID: PMC4930577 DOI: 10.1186/s13071-016-1663-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 06/22/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The common scabies mite, Sarcoptes scabiei is a cosmopolitan parasite of humans and other mammals. An annotated genome of Sarcoptes scabiei var. canis has been deposited in the National Center for Biotechnology Information (NCBI) and VectorBase and a proteomic analysis of proteins in extracts of mite bodies and eggs from this strain has been reported. Here we mined the data to identify predicted proteins that are known to be involved in specific biological processes in other animals. RESULTS We identified predicted proteins that are associated with immunomodulation of the host defense system, and biological processes of the mite including oxygen procurement and aerobic respiration, oxidative metabolism, sensory reception and locating a host, neuronal transmission, stressors (heat shock proteins), molting, movement, nutrient procurement and digestion, and excretion and water balance. We used these data to speculate that certain biological processes may occur in scabies mites. CONCLUSION This analysis helps understand the biology of Sarcoptes scabiei var. canis and adds to the data already available in NCBI and VectorBase.
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Affiliation(s)
- Larry G Arlian
- Department of Biological Sciences, Wright State University, 3640 Colonel Glenn Hwy, Dayton, OH, 45435, USA.
| | - Marjorie S Morgan
- Department of Biological Sciences, Wright State University, 3640 Colonel Glenn Hwy, Dayton, OH, 45435, USA
| | - S Dean Rider
- Department of Biological Sciences, Wright State University, 3640 Colonel Glenn Hwy, Dayton, OH, 45435, USA
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15
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Mans BJ, de Castro MH, Pienaar R, de Klerk D, Gaven P, Genu S, Latif AA. Ancestral reconstruction of tick lineages. Ticks Tick Borne Dis 2016; 7:509-35. [DOI: 10.1016/j.ttbdis.2016.02.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 01/26/2016] [Accepted: 02/02/2016] [Indexed: 01/15/2023]
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16
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Sommer D, Heffels-Redmann U, Köhler K, Lierz M, Kaleta EF. [Role of the poultry red mite (Dermanyssus gallinae) in the transmission of avian influenza A virus]. Tierarztl Prax Ausg G Grosstiere Nutztiere 2016; 44:26-33. [PMID: 26830386 DOI: 10.15653/tpg-150413] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 09/30/2015] [Indexed: 11/22/2022]
Abstract
OBJECTIVE The aim of this study was to investigate the role of the poultry red mite (Dermanyssus [D.] gallinae) in the horizontal transmission of avian influenza A virus (AIV) to chickens. This mite is the most common ectoparasite in poultry worldwide, and may play a role in the spread of infectious agents including AIV. Currently, the control of mites is difficult due to frequently developed resistance to many acaricides, their nocturnality and their ability to survive hidden without feeding for months. MATERIALS AND METHODS D. gallinae were collected in a commercial layer farm and housed in self-made fibreboard boxes. SPF chickens were intravenously infected with AIV strain A/turkey/Ontario/7732/1966 (H5N9). The viraemia in chickens was monitored and at an appropriate time point about 1000 mites were allowed to suck on the AIV infected chickens. Re-isolation of the virus from blood-filled mites was tried daily for 14 days using chicken embryo fibroblast cultures and embryonated chicken eggs. Subsequently, the virus containing mites were placed into boxes that contained naïve SPF chickens to enable virus transmission from mites to chickens. Possible transmission to the chickens was examined using clinical signs, serology, gross lesions, histopathology and immunohistochemistry. RESULTS Chickens developed a dose-dependent viraemia one day after infection, therefore this day was chosen for the bloodmeal of the mites. AIV was detected in mites after bloodsucking on AIV-infected chickens over a 10-day period. Naïve SPF chickens were infected during bloodsucking of AIV carrying mites. AIV isolates in mites and in chickens were undistinguishable from the original AIV inoculum by RT-PCR. CONCLUSIONS D. gallinae ingested AIV during bloodmeals on AIV infected chickens and are able to transmit AIV to SPF chickens. Therefore, mites serve as mechanical vector of AIV and may play a major role in the circulation of AIV within a facility or area although the life span of infectious virus in the mite is limited. CLINICAL RELEVANCE The proven transmission requires more than ever a systematic control of this ectoparasite in order to maintain poultry health and productivity. The demonstrated vector function of this mite is of great significance for poultry flocks all over the world.
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Affiliation(s)
| | | | | | | | - E F Kaleta
- Prof. Dr. Dr. h. c. Erhard F. Kaleta, Klinik für Vögel, Reptilien, Amphibien und Fische, Klinikum Veterinärmedizin, Justus-Liebig-Universität, Frankfurter Straße 91-93, 35392 Gießen, E-Mail:
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17
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Pritchard J, Kuster T, Sparagano O, Tomley F. Understanding the biology and control of the poultry red mite Dermanyssus gallinae: a review. Avian Pathol 2016; 44:143-53. [PMID: 25895578 DOI: 10.1080/03079457.2015.1030589] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Dermanyssus gallinae, the poultry red mite (PRM), is a blood-feeding ectoparasite capable of causing pathology in birds, amongst other animals. It is an increasingly important pathogen in egg layers and is responsible for substantial economic losses to the poultry industry worldwide. Even though PRM poses a serious problem, very little is known about the basic biology of the mite. Here we review the current body of literature describing red mite biology and discuss how this has been, or could be, used to develop methods to control PRM infestations. We focus primarily on the PRM digestive system, salivary glands, nervous system and exoskeleton and also explore areas of PRM biology which have to date received little or no study but have the potential to offer new control targets.
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Affiliation(s)
- James Pritchard
- a Department of Pathology and Pathogen Biology, The Royal Veterinary College , University of London , Hatfield , UK
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18
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Gonzalez E, Brereton NJB, Marleau J, Guidi Nissim W, Labrecque M, Pitre FE, Joly S. Meta-transcriptomics indicates biotic cross-tolerance in willow trees cultivated on petroleum hydrocarbon contaminated soil. BMC PLANT BIOLOGY 2015; 15:246. [PMID: 26459343 PMCID: PMC4603587 DOI: 10.1186/s12870-015-0636-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 09/30/2015] [Indexed: 05/09/2023]
Abstract
BACKGROUND High concentrations of petroleum hydrocarbon (PHC) pollution can be hazardous to human health and leave soils incapable of supporting agricultural crops. A cheap solution, which can help restore biodiversity and bring land back to productivity, is cultivation of high biomass yielding willow trees. However, the genetic mechanisms which allow these fast-growing trees to tolerate PHCs are as yet unclear. METHODS Salix purpurea 'Fish Creek' trees were pot-grown in soil from a former petroleum refinery, either lacking or enriched with C10-C50 PHCs. De novo assembled transcriptomes were compared between tree organs and impartially annotated without a priori constraint to any organism. RESULTS Over 45% of differentially expressed genes originated from foreign organisms, the majority from the two-spotted spidermite, Tetranychus urticae. Over 99% of T. urticae transcripts were differentially expressed with greater abundance in non-contaminated trees. Plant transcripts involved in the polypropanoid pathway, including phenylalanine ammonia-lyase (PAL), had greater expression in contaminated trees whereas most resistance genes showed higher expression in non-contaminated trees. CONCLUSIONS The impartial approach to annotation of the de novo transcriptomes, allowing for the possibility for multiple species identification, was essential for interpretation of the crop's response treatment. The meta-transcriptomic pattern of expression suggests a cross-tolerance mechanism whereby abiotic stress resistance systems provide improved biotic resistance. These findings highlight a valuable but complex biotic and abiotic stress response to real-world, multidimensional contamination which could, in part, help explain why crops such as willow can produce uniquely high biomass yields on challenging marginal land.
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Affiliation(s)
- Emmanuel Gonzalez
- Institut de recherche en biologie végétale, University of Montreal, 4101 Sherbrooke E, Montreal, QC, H1X 2B2, Canada.
| | - Nicholas J B Brereton
- Institut de recherche en biologie végétale, University of Montreal, 4101 Sherbrooke E, Montreal, QC, H1X 2B2, Canada.
| | - Julie Marleau
- Institut de recherche en biologie végétale, University of Montreal, 4101 Sherbrooke E, Montreal, QC, H1X 2B2, Canada.
| | | | - Michel Labrecque
- Institut de recherche en biologie végétale, University of Montreal, 4101 Sherbrooke E, Montreal, QC, H1X 2B2, Canada.
- Montreal Botanical Gardens, 4101 Sherbrooke E, Montreal, QC, H1X 2B2, Canada.
| | - Frederic E Pitre
- Institut de recherche en biologie végétale, University of Montreal, 4101 Sherbrooke E, Montreal, QC, H1X 2B2, Canada.
- Montreal Botanical Gardens, 4101 Sherbrooke E, Montreal, QC, H1X 2B2, Canada.
| | - Simon Joly
- Institut de recherche en biologie végétale, University of Montreal, 4101 Sherbrooke E, Montreal, QC, H1X 2B2, Canada.
- Montreal Botanical Gardens, 4101 Sherbrooke E, Montreal, QC, H1X 2B2, Canada.
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Santamaría ME, González-Cabrera J, Martínez M, Grbic V, Castañera P, Díaz L, Ortego F. Digestive proteases in bodies and faeces of the two-spotted spider mite, Tetranychus urticae. JOURNAL OF INSECT PHYSIOLOGY 2015; 78:69-77. [PMID: 25960286 DOI: 10.1016/j.jinsphys.2015.05.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 05/06/2015] [Accepted: 05/06/2015] [Indexed: 05/04/2023]
Abstract
Digestive proteases of the phytophagous mite Tetranychus urticae have been characterised by comparing their activity in body and faecal extracts. Aspartyl, cathepsin B- and L-like and legumain activities were detected in both mite bodies and faeces, with a specific activity of aspartyl and cathepsin L-like proteases about 5- and 2-fold higher, respectively, in mite faeces than in bodies. In general, all these activities were maintained independently of the host plant where the mites were reared (bean, tomato or maize). Remarkably, this is the first report in a phytophagous mite of legumain-like activity, which was characterised for its ability to hydrolyse the specific substrate Z-VAN-AMC, its activation by DTT and inhibition by IAA but not by E-64. Gel free nanoLC-nanoESI-QTOF MS/MS proteomic analysis of mite faeces resulted in the identification of four cathepsins L and one aspartyl protease (from a total of the 29 cathepsins L, 27 cathepsins B, 19 legumains and two aspartyl protease genes identified the genome of this species). Gene expression analysis reveals that four cathepsins L and the aspartyl protease identified in the mite faeces, but also two cathepsins B and two legumains that were not detected in the faeces, were expressed at high levels in the spider mite feeding stages (larvae, nymphs and adults) relative to embryos. Taken together, these results indicate a digestive role for cysteine and aspartyl proteases in T. urticae. The expression of the cathepsins B and L, legumains and aspartyl protease genes analysed in our study increased in female adults after feeding on Arabidopsis plants over-expressing the HvCPI-6 cystatin, that specifically targets cathepsins B and L, or the CMe trypsin inhibitor that targets serine proteases. This unspecific response suggests that in addition to compensation for inhibitor-targeted enzymes, the increase in the expression of digestive proteases in T. urticae may act as a first barrier against ingested plant defensive proteins.
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Affiliation(s)
- María E Santamaría
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu, 9, 28040 Madrid, Spain; Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid, Campus Montegancedo, Autovía M40 (Km 38), 28223 Pozuelo de Alarcón, Madrid, Spain; Department of Biology WSC 339/341, The University of Western Ontario, 1151 Richmond St, London, ON N6A 5B7, Canada
| | - Joel González-Cabrera
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu, 9, 28040 Madrid, Spain
| | - Manuel Martínez
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid, Campus Montegancedo, Autovía M40 (Km 38), 28223 Pozuelo de Alarcón, Madrid, Spain
| | - Vojislava Grbic
- Department of Biology WSC 339/341, The University of Western Ontario, 1151 Richmond St, London, ON N6A 5B7, Canada
| | - Pedro Castañera
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu, 9, 28040 Madrid, Spain
| | - Lsabel Díaz
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid, Campus Montegancedo, Autovía M40 (Km 38), 28223 Pozuelo de Alarcón, Madrid, Spain
| | - Félix Ortego
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu, 9, 28040 Madrid, Spain.
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Abstract
In vertebrates and invertebrates, morphological and functional features of gastrointestinal (GI) tracts generally reflect food chemistry, such as content of carbohydrates, proteins, fats, and material(s) refractory to rapid digestion (e.g., cellulose). The expression of digestive enzymes and nutrient transporters approximately matches the dietary load of their respective substrates, with relatively modest excess capacity. Mechanisms explaining differences in hydrolase activity between populations and species include gene copy number variations and single-nucleotide polymorphisms. Transcriptional and posttranscriptional adjustments mediate phenotypic changes in the expression of hydrolases and transporters in response to dietary signals. Many species respond to higher food intake by flexibly increasing digestive compartment size. Fermentative processes by symbiotic microorganisms are important for cellulose degradation but are relatively slow, so animals that rely on those processes typically possess special enlarged compartment(s) to maintain a microbiota and other GI structures that slow digesta flow. The taxon richness of the gut microbiota, usually identified by 16S rRNA gene sequencing, is typically an order of magnitude greater in vertebrates than invertebrates, and the interspecific variation in microbial composition is strongly influenced by diet. Many of the nutrient transporters are orthologous across different animal phyla, though functional details may vary (e.g., glucose and amino acid transport with K+ rather than Na+ as a counter ion). Paracellular absorption is important in many birds. Natural toxins are ubiquitous in foods and may influence key features such as digesta transit, enzymatic breakdown, microbial fermentation, and absorption.
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Affiliation(s)
- William H Karasov
- Forest and Wildlife Ecology, University of Wisconsin-Madison, Madison, Wisconsin, USA.
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An aspartic protease of the scabies mite Sarcoptes scabiei is involved in the digestion of host skin and blood macromolecules. PLoS Negl Trop Dis 2013; 7:e2525. [PMID: 24244770 PMCID: PMC3820722 DOI: 10.1371/journal.pntd.0002525] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 09/27/2013] [Indexed: 11/19/2022] Open
Abstract
Background Scabies is a disease of worldwide significance, causing considerable morbidity in both humans and other animals. The scabies mite Sarcoptes scabiei burrows into the skin of its host, obtaining nutrition from host skin and blood. Aspartic proteases mediate a range of diverse and essential physiological functions such as tissue invasion and migration, digestion, moulting and reproduction in a number of parasitic organisms. We investigated whether aspartic proteases may play role in scabies mite digestive processes. Methodology/Principle Findings We demonstrated the presence of aspartic protease activity in whole scabies mite extract. We then identified a scabies mite aspartic protease gene sequence and produced recombinant active enzyme. The recombinant scabies mite aspartic protease was capable of digesting human haemoglobin, serum albumin, fibrinogen and fibronectin, but not collagen III or laminin. This is consistent with the location of the scabies mites in the upper epidermis of human skin. Conclusions/Significance The development of novel therapeutics for scabies is of increasing importance given the evidence of emerging resistance to current treatments. We have shown that a scabies mite aspartic protease plays a role in the digestion of host skin and serum molecules, raising the possibility that interference with the function of the enzyme may impact on mite survival. Scabies is an infectious disease of the skin caused by infestation with the parasitic mite Sarcoptes scabiei. It is a disease that has a considerable impact on humans and other animals, including livestock, wildlife and companion animals. Scabies mites burrow into the skin of their host, consuming host skin and blood molecules. Aspartic proteases play a key role in invasion and digestion processes in many parasitic organisms. We have identified a scabies mite aspartic protease and have shown that it is capable of digesting human haemoglobin, serum albumin, fibrinogen and fibronectin in vitro, indicating that it plays a role in mite digestive processes. This raises the possibility that interfering with the function of this digestive enzyme may impact on mite survival.
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Schicht S, Qi W, Poveda L, Strube C. The predicted secretome and transmembranome of the poultry red mite Dermanyssus gallinae. Parasit Vectors 2013; 6:259. [PMID: 24020355 PMCID: PMC3846644 DOI: 10.1186/1756-3305-6-259] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Accepted: 09/08/2013] [Indexed: 11/10/2022] Open
Abstract
Background The worldwide distributed hematophagous poultry red mite Dermanyssus gallinae (De Geer, 1778) is one of the most important pests of poultry. Even though 35 acaricide compounds are available, control of D. gallinae remains difficult due to acaricide resistances as well as food safety regulations. The current study was carried out to identify putative excretory/secretory (pES) proteins of D. gallinae since these proteins play an important role in the host-parasite interaction and therefore represent potential targets for the development of novel intervention strategies. Additionally, putative transmembrane proteins (pTM) of D. gallinae were analyzed as representatives of this protein group also serve as promising targets for new control strategies. Methods D. gallinae pES and pTM protein prediction was based on putative protein sequences of whole transcriptome data which was parsed to different bioinformatical servers (SignalP, SecretomeP, TMHMM and TargetP). Subsequently, pES and pTM protein sequences were functionally annotated by different computational tools. Results Computational analysis of the D. gallinae proteins identified 3,091 pES (5.6%) and 7,361 pTM proteins (13.4%). A significant proportion of pES proteins are considered to be involved in blood feeding and digestion such as salivary proteins, proteases, lipases and carbohydrases. The cysteine proteases cathepsin D and L as well as legumain, enzymes that cleave hemoglobin during blood digestion of the near related ticks, represented 6 of the top-30 BLASTP matches of the poultry red mite’s secretome. Identified pTM proteins may be involved in many important biological processes including cell signaling, transport of membrane-impermeable molecules and cell recognition. Ninjurin-like proteins, whose functions in mites are still unknown, represent the most frequently occurring pTM. Conclusion The current study is the first providing a mite’s secretome as well as transmembranome and provides valuable insights into D. gallinae pES and pTM proteins operating in different metabolic pathways. Identifying a variety of molecules putatively involved in blood feeding may significantly contribute to the development of new therapeutic targets or vaccines against this poultry pest.
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Affiliation(s)
- Sabine Schicht
- Institute for Parasitology, University of Veterinary Medicine Hannover, Buenteweg 17, 30559 Hannover, Germany.
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Morales M, Iraola V, Leonor JR, Carnés J. Enzymatic activity of allergenic house dust and storage mite extracts. JOURNAL OF MEDICAL ENTOMOLOGY 2013; 50:147-154. [PMID: 23427664 DOI: 10.1603/me12154] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Proteases are involved in the pathogenicity of allergy, increasing epithelial permeability and acting as adjuvants. Enzymatic activity is therefore important for the allergenicity of an extract and also affects its stability and safety. However, the enzymatic activity of extracts is not usually evaluated. The objective of this study was to evaluate the enzymatic activity of the most allergenic mite extracts and to investigate their allergenic properties. Extracts from nine allergenic mite species (Dermatophagoides pteronyssinus, Dermatophagoides farinae Hughes, Euroglyphus maynei, Lepidoglyphus destructor, Tyrophagus putrescentiae (Schrank), Glycyphagus domesticus (DeGeer), Acarus siro L., Chortoglyphus arcuatus, and Blomia tropicalis) were characterized. Protein and allergen profiles were characterized by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and western-blot, respectively. Gelatinolytic activity was evaluated with a zymogram and the activity of other enzymes (cysteine, serine proteases, and esterases) was evaluated individually or with the API-ZYM system. The main differences in protease activity were found between house dust mites and storage mites. House dust mites presented higher cysteine protease activity while storage mites presented higher serine protease activity. These differences are in line with their trophic specialization. A wide range of different activities was found in all the extracts analyzed, reflecting the fact that the extracts preserve the activity of many enzymes, this being necessary for a correct diagnosis. However, enzymes may act as adjuvants and, therefore, could lead to undesirable effects in immunotherapies, making this activity not suitable for treatment products. Modified extracts with lower enzymatic activity could be more appropriate for immunotherapy.
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Affiliation(s)
- Maria Morales
- Research & Development, Laboratorios LETI, S.L., Calle del Sol no 5, 28760 Tres Cantos, Madrid, Spain
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Santamaria ME, Cambra I, Martinez M, Pozancos C, González-Melendi P, Grbic V, Castañera P, Ortego F, Diaz I. Gene pyramiding of peptidase inhibitors enhances plant resistance to the spider mite Tetranychus urticae. PLoS One 2012; 7:e43011. [PMID: 22900081 PMCID: PMC3416837 DOI: 10.1371/journal.pone.0043011] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Accepted: 07/17/2012] [Indexed: 11/18/2022] Open
Abstract
The two-spotted spider mite Tetranychus urticae is a damaging pest worldwide with a wide range of host plants and an extreme record of pesticide resistance. Recently, the complete T. urticae genome has been published and showed a proliferation of gene families associated with digestion and detoxification of plant secondary compounds which supports its polyphagous behaviour. To overcome spider mite adaptability a gene pyramiding approach has been developed by co-expressing two barley proteases inhibitors, the cystatin Icy6 and the trypsin inhibitor Itr1 genes in Arabidopsis plants by Agrobacterium-mediated transformation. The presence and expression of both transgenes was studied by conventional and quantitative real time RT-PCR assays and by indirect ELISA assays. The inhibitory activity of cystatin and trypsin inhibitor was in vitro analysed using specific substrates. Single and double transformants were used to assess the effects of spider mite infestation. Double transformed lines showed the lowest damaged leaf area in comparison to single transformants and non-transformed controls and different accumulation of H(2)O(2) as defence response in the leaf feeding site, detected by diaminobenzidine staining. Additionally, an impact on endogenous mite cathepsin B- and L-like activities was observed after feeding on Arabidopsis lines, which correlates with a significant increase in the mortality of mites fed on transformed plants. These effects were analysed in view of the expression levels of the target mite protease genes, C1A cysteine peptidase and S1 serine peptidase, identified in the four developmental mite stages (embryo, larvae, nymphs and adults) performed using the RNA-seq information available at the BOGAS T. urticae database. The potential of pyramiding different classes of plant protease inhibitors to prevent plant damage caused by mites as a new tool to prevent pest resistance and to improve pest control is discussed.
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Affiliation(s)
- Maria Estrella Santamaria
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA). Campus Montegancedo Universidad Politécnica de Madrid, Autopista M40 (km 38), Madrid, Spain
- Department of Biology Western University, Ontario, Canada
- Dpto. Biologia Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, Spain
| | | | - Manuel Martinez
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA). Campus Montegancedo Universidad Politécnica de Madrid, Autopista M40 (km 38), Madrid, Spain
| | - Clara Pozancos
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA). Campus Montegancedo Universidad Politécnica de Madrid, Autopista M40 (km 38), Madrid, Spain
| | - Pablo González-Melendi
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA). Campus Montegancedo Universidad Politécnica de Madrid, Autopista M40 (km 38), Madrid, Spain
| | | | - Pedro Castañera
- Dpto. Biologia Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, Spain
| | - Felix Ortego
- Dpto. Biologia Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, Spain
| | - Isabel Diaz
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA). Campus Montegancedo Universidad Politécnica de Madrid, Autopista M40 (km 38), Madrid, Spain
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Santamaría ME, Hernández-Crespo P, Ortego F, Grbic V, Grbic M, Diaz I, Martinez M. Cysteine peptidases and their inhibitors in Tetranychus urticae: a comparative genomic approach. BMC Genomics 2012; 13:307. [PMID: 22784002 PMCID: PMC3407033 DOI: 10.1186/1471-2164-13-307] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Accepted: 07/11/2012] [Indexed: 11/28/2022] Open
Abstract
Background Cysteine peptidases in the two-spotted spider mite Tetranychus urticae are involved in essential physiological processes, including proteolytic digestion. Cystatins and thyropins are inhibitors of cysteine peptidases that modulate their activity, although their function in this species has yet to be investigated. Comparative genomic analyses are powerful tools to obtain advanced knowledge into the presence and evolution of both, peptidases and their inhibitors, and could aid to elucidate issues concerning the function of these proteins. Results We have performed a genomic comparative analysis of cysteine peptidases and their inhibitors in T. urticae and representative species of different arthropod taxonomic groups. The results indicate: i) clade-specific proliferations are common to C1A papain-like peptidases and for the I25B cystatin family of inhibitors, whereas the C1A inhibitors thyropins are evolutionarily more conserved among arthropod clades; ii) an unprecedented extensive expansion for C13 legumain-like peptidases is found in T. urticae; iii) a sequence-structure analysis of the spider mite cystatins suggests that diversification may be related to an expansion of their inhibitory range; and iv) an in silico transcriptomic analysis shows that most cathepsin B and L cysteine peptidases, legumains and several members of the cystatin family are expressed at a higher rate in T. urticae feeding stages than in embryos. Conclusion Comparative genomics has provided valuable insights on the spider mite cysteine peptidases and their inhibitors. Mite-specific proliferations of C1A and C13 peptidase and I25 cystatin families and their over-expression in feeding stages of mites fit with a putative role in mite’s feeding and could have a key role in its broad host feeding range.
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Affiliation(s)
- María Estrella Santamaría
- Department of Biology WSC 339/341, The University of Western Ontario, 1151 Richmond St, London, ON N6A 5B7, Canada
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Holt DC, Burgess STG, Reynolds SL, Mahmood W, Fischer K. Intestinal proteases of free-living and parasitic astigmatid mites. Cell Tissue Res 2012; 351:339-52. [DOI: 10.1007/s00441-012-1369-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Accepted: 02/08/2012] [Indexed: 11/28/2022]
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Assessment of cathepsin D and L-like proteinases of poultry red mite, Dermanyssus gallinae (De Geer), as potential vaccine antigens. Parasitology 2012; 139:755-65. [PMID: 22310226 DOI: 10.1017/s0031182011002356] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Vaccination is a feasible strategy for controlling the haematophagous poultry red mite Dermanyssus gallinae. A cDNA library enriched for genes upregulated after feeding was created to identify potential vaccine antigens. From this library, a gene (Dg-CatD-1) encoding a 383 amino acid protein (Dg-CatD-1) with homology to cathepsin D lysosomal aspartyl proteinases was identified as a potential vaccine candidate. A second gene (Dg-CatL-1) encoding a 341 amino acid protein (Dg-CatL-1) with homology to cathepsin L cysteine proteinases was also selected for further study. IgY obtained from naturally infested hens failed to detect Dg-CatD-1 suggesting that it is a concealed antigen. Conversely, Dg-CatL-1 was detected by IgY derived from natural-infestation, indicating that infested hens are exposed to Dg-CatL-1. Mortality rates 120 h after mites had been fed anti-Dg-CatD-1 were significantly higher than those fed control IgY (PF<0·01). In a survival analysis, fitting a proportional hazards model to the time of death of mites, anti-Dg-CatD-1 and anti-Dg-CatL-1 IgY had 4·42 and 2·13 times higher risks of dying compared with controls (PF<0·05). Dg-CatD-1 and L-1 both have potential as vaccine antigens as part of a multi-component vaccine and have the potential to be improved as vaccine antigens using alternative expression systems.
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Erban T, Hubert J. Visualization of protein digestion in the midgut of the acarid mite Lepidoglyphus destructor. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2011; 78:74-86. [PMID: 21818771 DOI: 10.1002/arch.20441] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The ingestion of chromogenic or fluorescent substrates for protease detection enables the visualization of digestive processes in mites in vivo due to their transparent bodies. The substrates for protease detection were offered to Lepidoglyphus destructor, and the resulting signals were observed in specimens under a compound microscope. The protease activity was successfully localized using chromogenic substrates (azoalbumin, AAPpNA, SAAPFpNA, elastin-orcein, SA(3) pNA, ZRRpNA, ArgpNA, and MAAPMpNA) and fluorescent substrates (casein-fluorescein, albumin-fluorescein, AAPAMC, BAAMC, ZRRAMC, ArgAMC, and AGPPPAMC). No activity was detected using the keratin azure and BApNA substrates. In the mesodeum, trypsin-like activity generated by hydrolysis of the BApNA substrate was not observed, but the BAAMC substrate allowed the visualization of trypsin-like activity in food boli in the posterior mesodeum. The results indicate that cathepsins B, D, and G and cathepsin H or aminopeptidase-like activities are present in the midgut of L. destructor. Among these activities, cathepsin D-like activity was identified for the first time in the gut of L. destructor. All proteases mentioned are produced in the mesodeal lumen and form the food bolus together with ingested food, afterward passing through the gut to be defecated. The method used enables the visualization of protease activities in the gut of transparent animals.
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Affiliation(s)
- Tomas Erban
- Crop Research Institute, Drnovska, Praha, Ruzyne, Czechia.
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29
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Avalos AM, Ploegh HL. Competition by inhibitory oligonucleotides prevents binding of CpG to C-terminal TLR9. Eur J Immunol 2011; 41:2820-7. [PMID: 21766476 DOI: 10.1002/eji.201141563] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 06/07/2011] [Accepted: 07/12/2011] [Indexed: 12/23/2022]
Abstract
TLR9 recognizes unmethylated CpG-containing DNA commonly found in bacteria. Synthetic oligonucleotides containing CpG-motifs (CpG ODNs) recapitulate the activation of TLR9 by microbial DNA, whereas inversion of the CG dinucleotide within the CpG motif to GC (GpC ODNs) renders such ODNs inactive. This difference cannot be attributed to binding of ODNs to the full-length TLR9 ectodomain, as both CpG and GpC ODNs bind comparably. Activation of murine TLR9 requires cleavage into an active C-terminal fragment, which binds CpG robustly. We therefore compared the ability of CpG and GpC ODNs to bind to full-length and C-terminal TLR9, and their impact on the cleavage of TLR9. We found that CpG binds better to C-terminal TLR9 when compared with GpC, despite comparably low binding of both ODNs to full-length TLR9. Neither CpG nor GpC ODNs affected TLR9 cleavage in murine RAW 264.7 cells stably expressing TLR9-Myc. Inhibitory ODNs (IN-ODNs) block TLR9 signaling, but how they do so remains unclear. We show here that inhibitory ODNs do not impede TLR9 cleavage but bind to C-terminal TLR9 preferentially, and thereby compete for CpG ODN binding both in RAW cells and in TLR9-deficient cells transduced with TLR9-Myc. Ligand binding to C-terminal fragment thus determines the outcome of activation through TLR9.
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Affiliation(s)
- Ana M Avalos
- Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Nine Cambridge Center, Cambridge, MA, USA
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Karasov WH, Martínez del Rio C, Caviedes-Vidal E. Ecological physiology of diet and digestive systems. Annu Rev Physiol 2011; 73:69-93. [PMID: 21314432 DOI: 10.1146/annurev-physiol-012110-142152] [Citation(s) in RCA: 186] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The morphological and functional design of gastrointestinal tracts of many vertebrates and invertebrates can be explained largely by the interaction between diet chemical constituents and principles of economic design, both of which are embodied in chemical reactor models of gut function. Natural selection seems to have led to the expression of digestive features that approximately match digestive capacities with dietary loads while exhibiting relatively modest excess. Mechanisms explaining differences in hydrolase activity between populations and species include gene copy number variations and single-nucleotide polymorphisms. In many animals, both transcriptional adjustment and posttranscriptional adjustment mediate phenotypic flexibility in the expression of intestinal hydrolases and transporters in response to dietary signals. Digestive performance of animals depends also on their gastrointestinal microbiome. The microbiome seems to be characterized by large beta diversity among hosts and by a common core metagenome and seems to differ flexibly among animals with different diets.
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Affiliation(s)
- William H Karasov
- Department of Forest and Wildlife Ecology, University of Wisconsin, Madison, 53706, USA.
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31
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Carrillo L, Martinez M, Ramessar K, Cambra I, Castañera P, Ortego F, Díaz I. Expression of a barley cystatin gene in maize enhances resistance against phytophagous mites by altering their cysteine-proteases. PLANT CELL REPORTS 2011; 30:101-12. [PMID: 21082183 DOI: 10.1007/s00299-010-0948-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Accepted: 10/28/2010] [Indexed: 05/08/2023]
Abstract
Phytocystatins are inhibitors of cysteine-proteases from plants putatively involved in plant defence based on their capability of inhibit heterologous enzymes. We have previously characterised the whole cystatin gene family members from barley (HvCPI-1 to HvCPI-13). The aim of this study was to assess the effects of barley cystatins on two phytophagous spider mites, Tetranychus urticae and Brevipalpus chilensis. The determination of proteolytic activity profile in both mite species showed the presence of the cysteine-proteases, putative targets of cystatins, among other enzymatic activities. All barley cystatins, except HvCPI-1 and HvCPI-7, inhibited in vitro mite cathepsin L- and/or cathepsin B-like activities, HvCPI-6 being the strongest inhibitor for both mite species. Transgenic maize plants expressing HvCPI-6 protein were generated and the functional integrity of the cystatin transgene was confirmed by in vitro inhibitory effect observed against T. urticae and B. chilensis protein extracts. Feeding experiments impaired on transgenic lines performed with T. urticae impaired mite development and reproductive performance. Besides, a significant reduction of cathepsin L-like and/or cathepsin B-like activities was observed when the spider mite fed on maize plants expressing HvCPI-6 cystatin. These findings reveal the potential of barley cystatins as acaricide proteins to protect plants against two important mite pests.
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Affiliation(s)
- Laura Carrillo
- Dpto. Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maéztu 9, 28040 Madrid, Spain
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Vitellin- and hemoglobin-digesting enzymes in Rhipicephalus (Boophilus) microplus larvae and females. Comp Biochem Physiol B Biochem Mol Biol 2010; 157:326-35. [DOI: 10.1016/j.cbpb.2010.08.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Revised: 08/03/2010] [Accepted: 08/06/2010] [Indexed: 11/21/2022]
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Erban T, Hubert J. Comparative analyses of proteolytic activities in seven species of synanthropic acaridid mites. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2010; 75:187-206. [PMID: 20936642 DOI: 10.1002/arch.20388] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Microplate assays with 96 wells were optimized to screen proteolytic activities in mite homogenates. Whole-mite extracts of Acarus siro, Aleuroglyphus ovatus, Tyrophagus putrescentiae, Tyroborus lini, Carpoglyphus lactis, Lepidoglyphus destructor, and Dermatophagoides farinae exhibited non-specific proteolytic activity in buffers from pH 2 to 12, and three peaks of highest activity at pH 3, 5-6, and 10 were distinguished. The reducing agent Tris(2-carboxyethyl)phosphine hydrochloride decreased general proteolytic activity on azocasein at pH 5 and 6. The results obtained on two non-specific substrates, azocasein and azoalbumin, showed highly different ranks of the species at pH 5 and 6. Proteolytic activities toward N(α)-Benzoyl-D,L-arginine 4-nitroanilide hydrochloride, N-Succinyl-L-alanyl-L-alanyl-L-prolyl-L-phenylalanine 4-nitroanilide, N-Succinyl-L-alanyl-L-alanyl-L-alanine 4-nitroanilide, Benzyloxycarbonyl-L-arginine-L-arginyl 4-nitroanilide, and N-Methoxysuccinyl-L-alanyl-L-alanyl-L-prolyl-L-methionine 4-nitroanilide (MAAPMpNA) were highest at alkaline pH, but the activity toward MAAPMpNA was also high at pH 5 and 6. In contrast, N-Succinyl-L-alanyl-L-alanyl-L-phenylalanine 4-nitroanilide (AAPpNA) and L-arginyl 4-nitroanilide (ArgpNA) had the highest activity recorded at pH 6. The high activities observed on AAPpNA, ArgpNA, and MAAPMpNA at digestive pH suggest that enzymes present in these extracts could have the majority of proteolysis in the mite gut. Evidence of the presence of proteolytic activities on all tested substrates and in all the tested mite homogenates suggests that the proteolytic activities may contribute to allergenicity. Poor or undetected hydrolytic activities of mite extracts toward substrates for keratin and collagen at digestive pH underline the importance of ecological interactions between mites and microorganisms in the utilization of such substrates.
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Affiliation(s)
- Tomas Erban
- Crop Research Institute, Praha - Ruzyne, Czechia.
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McNair CM, Billingsley PF, Nisbet AJ, Knox DP. Feeding-associated gene expression in sheep scab mites (Psoroptes ovis). Vet Res 2009; 41:16. [PMID: 19852923 PMCID: PMC2789330 DOI: 10.1051/vetres/2009064] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2009] [Accepted: 10/22/2009] [Indexed: 11/14/2022] Open
Abstract
The mite Psoroptes ovis is the causative agent of sheep scab. Although not usually fatal, the disease can spread rapidly and is a serious animal welfare concern. Vaccine development against ectoparasites has primarily focussed on two sources of candidate vaccine antigens – “exposed” antigens that are secreted in saliva during feeding on a host and “concealed” antigens that are usually expressed in the parasite gut and may be involved in digestion. Here, we sought to identify genes encoding proteins important for mite feeding and digestion by a subtractive suppressive hybridisation approach comparing mRNA transcript abundance in “fed” and “starved” mites. The study identified a variety of genes which are up-regulated by feeding mites. These included group 1, 5, 7 and 13 allergens including the previously described cysteine protease Pso o 1. In addition, numerous novel genes were identified here including some encoding potential salivary gland proteins and others encoding proteins which may facilitate feeding such as a serum opacity factor. An olfactory receptor-like protein was identified in the starved mite population which may help the mite to identify a host.
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Affiliation(s)
- Carol M McNair
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, nr Edinburgh EH26 0PZ, United Kingdom
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Watkins CA, Mackellar A, Frew D, Mackie C, George A, Hopkins J, Burgess STG, McNeilly TN, Huntley JF. Gene expression profiling of ovine keratinocytes stimulated with Psoroptes ovis mite antigen--a preliminary study. Parasite Immunol 2009; 31:304-11. [PMID: 19493210 DOI: 10.1111/j.1365-3024.2009.01103.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Sheep scab is caused by the noninvasive mite, Psoroptes ovis, which initiates a profound pro-inflammatory skin response leading to lesion development. To investigate these early events between the skin and the parasite, primary ovine epidermal keratinocyte cultures were generated and challenged with mite derived antigens. The kinetics of the mRNA response of these cells were monitored by microarray. The results indicated that the cells responded within 1 h of challenge, with a significant increase in the pro-inflammatory cytokine IL-8. This result was confirmed by real-time RT-PCR, and showed that IL-8 up-regulation was maximal at 1 h but declined to pre-stimulation levels at 24 and 48 h. The IL-8 mRNA response to mite wash antigens containing secretory and/or excretory proteins was also investigated and compared to the response to whole mite antigen. These studies revealed that the mite wash antigen, at a challenge dose of 10 microg/mL, was markedly more potent and induced significantly higher levels of IL-8 mRNA than the same concentration of whole mite antigen. These results are discussed in relation to mite establishment and survival on the ovine host.
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Affiliation(s)
- C A Watkins
- Moredun Research Institute, Pentland Science Park, Bush Loan, Penicuik, Midlothian, UK
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Prey mediated effects of Bt maize on fitness and digestive physiology of the red spider mite predator Stethorus punctillum Weise (Coleoptera: Coccinellidae). Transgenic Res 2008; 17:943-54. [PMID: 18322817 DOI: 10.1007/s11248-008-9177-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2007] [Accepted: 02/13/2008] [Indexed: 10/22/2022]
Abstract
The present study investigated prey-mediated effects of two maize varieties expressing a truncated Cry1Ab, Compa CB (event Bt176) and DKC7565 (event MON810), on the biology of the ladybird Stethorus punctillum. Although immuno-assays demonstrated the presence of Cry1Ab in both prey and predator collected from commercial maize-growing fields, neither transgenic variety had any negative effects on survival of the predator, nor on the developmental time through to adulthood. Furthermore, no subsequent effects on ladybird fecundity were observed. As a prerequisite to studying the interaction of ladybird proteases with Cry1Ab, proteases were characterised using a range of natural and synthetic substrates with diagnostic inhibitors. These results demonstrated that this predator utilises both serine and cysteine proteases for digestion. In vitro studies demonstrated that T. urticae were not able to process or hydrolyze Cry1Ab, suggesting that the toxin passes through the prey to the third trophic level undegraded, thus presumably retaining its insecticidal properties. In contrast, S. punctillum was able to activate the 130 kDa protoxin into the 65 kDa fragment; a fragment of similar size was also obtained with bovine trypsin, which is known to cleave the protoxin to the active form. Thus, despite a potential hazard to the ladybird of Bt-expressing maize (since the predator was both exposed to, and able to proteolytically cleave the toxin, at least in vitro), no deleterious effects were observed.
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Nisbet AJ, MacKellar A, McLean K, Brennan GP, Huntley JF. Eukaryotic expression of recombinant Pso o 1, an allergen fromPsoroptes ovis, and its localization in the mite. Parasitology 2006; 134:83-9. [PMID: 16978441 DOI: 10.1017/s0031182006001235] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2006] [Revised: 07/17/2006] [Accepted: 07/17/2006] [Indexed: 11/06/2022]
Abstract
A cDNA encoding the immunogen Pso o 1 fromPsoroptes oviswas obtained by polymerase chain reaction (PCR) amplification. The amplicon contained the entire coding sequence for the prepro-enzyme in an open reading frame (ORF) of 966 bp. This gene encoded a predicted protein of 322 amino acids (aa) with 64% aa identity (80% similarity) to the major house dust mite faecal allergen Der f 1. The pro-enzyme form of Pso o 1 was expressed as a recombinant protein in thePichia pastoris-eukaryotic expression system. Maturation of the recombinant pro-enzyme by autocatalytic activation was not observed, and such maturation could not be achieved using a number of techniques known to activate recombinant Der p 1 and Der f 1 expressed in the same system. Serum raised against recombinant Pso o 1 cross-reacted with mature Der p 1 and allowed Pso o 1 to be immunolocalized to the gut ofP. ovis.
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Affiliation(s)
- A J Nisbet
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, EH26 0PZ, Scotland.
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Cardona G, Guisantes J, Eraso E, Serna LA, Martínez J. Enzymatic analysis of Blomia tropicalis and Blomia kulagini (Acari: Echimyopodidae) allergenic extracts obtained from different phases of culture growth. EXPERIMENTAL & APPLIED ACAROLOGY 2006; 39:281-8. [PMID: 16868679 DOI: 10.1007/s10493-006-9009-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2004] [Accepted: 05/05/2006] [Indexed: 05/11/2023]
Abstract
The majority of important allergenic extracts from arthropods present enzymatic activity. This activity has been studied particularly in Dermatophagoides house dust mites because of its implication in the stability and immunogenicity of extracts used as tools for the diagnosis and specific treatment of allergic diseases. Extracts from cultures of Blomia tropicalis [van Bronswijk (1973a, b). Acarologia 15:477-489, 490-505] and Blomia kulagini (Zakhvatkin 1936) were used to study enzymatic profiles during three growth periods of the mite population: latency phase, maximum mite concentration during exponential growth, and drop stage. The activities of 19 enzymes were analyzed using the Api Zym system. The results show a large variety of enzymes. Some enzymatic activity was found to be (almost) exclusively attributable to mites. The activity levels of proteases, glycosidases and lipases overlapped with the growth curve. Only phosphatase activity showed no significant change during mite growth when compared with the culture medium. We suggest that the glycosidases (beta-galactosidase, beta-glucuronidase, beta-N-acetylglucosaminidase, alpha-mannosidase and alpha-fucosidase) and proteases (leucine aminopeptidase and trypsin) may constitute suitable parameters for inclusion in the quality control process for the production of allergenic mite extracts, and may help define a new index for conducting environmental controls.
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Affiliation(s)
- G Cardona
- Department of Immunology, Microbiology and Parasitology, Faculty of Pharmacy, University of the Basque Country, Paseo de la Universidad 7, 01006, Vitoria, Spain
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Sánchez-Ramos I, Hernández CA, Castañera P, Ortego F. Proteolytic activities in body and faecal extracts of the storage mite, Acarus farris. MEDICAL AND VETERINARY ENTOMOLOGY 2004; 18:378-386. [PMID: 15642005 DOI: 10.1111/j.0269-283x.2004.00518.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Trypsin, chymotrypsin, cathepsins B and D, aminopeptidase and carboxypeptidases A and B were detected in body extracts of the storage mite Acarus farris (Oudemans) (Astigmata: Acaridae). Faeces-enriched medium exhibited higher (10-50-fold) specific protease activity rates than those measured with mite body extracts for trypsin, chymotrypsin and carboxypeptidases A and B, suggesting that they are involved in mite digestion. However, the activity of cathepsin B was only three-fold higher in faecal than in body extracts, indicating that its presence in the lumen of the digestive tract is low compared to that of serine proteases. The activity of aminopeptidases was higher in mite bodies, indicating that they might be membrane bound. Cathepsin D activity was only detected in body extracts, indicating that this enzyme is not a digestive protease in this species. Zymograms resolved three major bands of gelatinolytic activity, but at least one protease form was only present in body extracts. Protease inhibitors of different specificity were tested in vivo to establish their potential as control agents. The development of A. farris was significantly retarded when the immature stages were fed on artificial diet containing inhibitors of serine and cysteine proteases and aminopeptidases, whereas no such effect was found with inhibitors of aspartyl proteases and carboxypeptidases. Interestingly, the most significant effects on A. farris occurred when a combination of inhibitors targeting different enzyme classes was supplied mixed in the diet, suggesting a synergistic toxicity. Several plant lectins were also tested, but only wheat germ agglutinin and concanavalin-A affected development.
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van den Broek AHM, Else RW, Huntley JF, Machell J, Taylor MA, Miller HRP. Early Innate and Longer-term Adaptive Cutaneous Immunoinflammatory Responses during Primary Infestation with the Sheep Scab Mite, Psoroptes ovis. J Comp Pathol 2004; 131:318-29. [PMID: 15511540 DOI: 10.1016/j.jcpa.2004.05.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2004] [Accepted: 05/18/2004] [Indexed: 11/25/2022]
Abstract
Clinical observation has indicated that Psoroptes ovis mites provoke cutaneous inflammation within hours of experimental infestation, but the nature of this reaction has not been described. After infestation of naive sheep with ovigerous P. ovis mites, significant influxes of eosinophils (P<0.004) and neutrophils (P<0.001) were detected within 24 h. A significant (P<0.001) increase in mast cell numbers was observed by 96 h post-infestation. In addition, marked degenerative and proliferative epidermal lesions were evident 24 and 96 h, respectively, after infestation. The influence of the later, adaptive response on the cellular infiltrate at the advancing margin of the lesion and the original site of infestation was also monitored. Mast cell numbers were greatest at 21 days while recruitment of eosinophils and neutrophils was maximal 63 days after infestation. Lesional severity was particularly pronounced from 42 to 63 days after infestation, but significant resolution had occurred by 84 days. Pathological changes at the advancing margin of the lesion were more severe than at the initial site of infestation, and this was reflected by the numbers of mites present. These data suggest that P. ovis elicits an early innate cutaneous response that is subsequently augmented by the development of an adaptive immune response, the intensity of which corresponds to the local population density of mites.
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Affiliation(s)
- A H M van den Broek
- Department of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Veterinary Centre, Easter Bush, Roslin, Midlothian EH25 9RG, UK
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Hamilton KA, Nisbet AJ, Lehane MJ, Taylor MA, Billingsley PF. A physiological and biochemical model for digestion in the ectoparasitic mite, Psoroptes ovis (Acari: Psoroptidae). Int J Parasitol 2003; 33:773-85. [PMID: 12865077 DOI: 10.1016/s0020-7519(03)00089-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Mites are an important group of arthropod pests affecting crops, animals and humans. Despite this, detailed physiological studies on these organisms remain sparse due largely to their small size. Unifying models are required to draw together the diverse information from studies on different groups and species. This paper describes a model for digestion in the parasitic mite, Psoroptes ovis, the causative agent of psoroptic mange or sheep scab disease. The limited information about this species is supplemented with data from other acarines, especially house dust mites and ticks. We review the range of enzymes and allergens found in mites and consider their possible roles in digestion in mites, generally and in particular, P. ovis. Histological studies, enzyme biochemistry and molecular biology and experimental evidence suggest that P. ovis utilises a digestive system reliant upon acid peptidases functioning in a largely intracellular environment. The actions of the digestive enzymes are supplemented by the involvement of bacteria as potential direct and indirect sources of nutrition. It is possible that some extra-corporeal digestion also takes place. The interaction of bacteria and digestive enzymes on the skin surface of the sheep may be responsible for the excessive pathological reactions evident in clinical sheep scab.
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Affiliation(s)
- K A Hamilton
- Department of Zoology, University of Aberdeen, Tillydrone Ave., Aberdeen AB24 2TZ, Scotland, UK
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Affiliation(s)
- A H van den Broek
- Department of Veterinary Clinical Studies, Royal School of Veterinaary Studies, University of Edimburgh, Easter Bush Veterinary Centre, Roslin, Midlothian EH 9RG
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Nisbet AJ, Billingsley PF. Characterisation of aminopeptidase activity in scab mites (Psoroptes spp.). INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2002; 32:1123-1131. [PMID: 12213247 DOI: 10.1016/s0965-1748(02)00048-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Soluble and membrane-bound aminopeptidase activities were demonstrated in extracts of P. cuniculi (Delafond). Leucine aminopeptidase (LAP) activity in the soluble fraction of P. cuniculi extracts displayed substrate preference for amino acid derivatives with terminal leucine and methionine over those with acidic, basic or heterocyclic groups. P. cuniculi LAP was inhibited by leucinethiol (IC(50) = 1.4 +/- 0.4 nM), bestatin (IC(50) = 3.9 +/- 1.7 microM), Arphamenine A (IC(50) = 0.37 +/- 0.03 mM) the chelating agent 1,10-phenanthroline (IC(50) = 2.3 +/- 0.5 mM), Zn(2+), Cu(2+) Ni(2+), and Co(2+), and activated by Mn(2+) and Mg(2+). The LAP activity was visualised as a single major band after electrophoresis on native gels and eluted from a size exclusion column as a single major peak representing a molecular mass range of 85-116 kDa. Degenerate oligonucleotide primers were used to amplify short fragments of genomic DNA containing nucleotide sequence coding for the cation-binding motifs of the co-catalytic Zn(2+) binding domains of dizinc leucine aminopeptidases in both P. cuniculi and P.ovis (Hering). The major soluble aminopeptidase from these mites therefore displays most of the characteristics associated with typical cytosolic leucine aminopeptidases belonging to the M17 family of metalloproteinases.
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Affiliation(s)
- A J Nisbet
- Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, UK
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Kenyon F, Knox D. The proteinases of Psoroptes ovis, the sheep scab mite--their diversity and substrate specificity. Vet Parasitol 2002; 105:317-25. [PMID: 11983306 DOI: 10.1016/s0304-4017(02)00015-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The sheep scab mite, Psoroptes ovis, causes severe dermatitis in infected sheep with severe welfare and production implications. The dermatitis has the characteristics of an immediate hypersensitivity type reaction which, by analogy to other mite species, including the house dust mites (Dermatophagoides spp.), is likely to be invoked by a variety of allergens including mite-derived proteinases. Here, the proteinases in P. ovis extracts were characterised using substrate gel analysis, inhibitor sensitivity and their ability to degrade a variety of potential natural protein substrates. These analyses showed that mites contain several proteinases which could be differentiated on the basis of molecular size and inhibitor sensitivity with cysteine, metalloproteinases and aspartyl proteinases predominating. These proteinases degraded collagen and fibronectin, possibly indicative of a role in lesion initiation, they degraded several blood proteins, a property which may aid mite feeding and they degraded immunoglobulin G, possibly aiding immuno-evasion. Because proteinases, particularly the cysteine class, are demonstrably allergenic in other mite infestations, these proteinases clearly merit further immunological and biochemical definition.
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Affiliation(s)
- Fiona Kenyon
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, Midlothian EH26 0PZ, UK
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