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Liu L, Yan F, Zhang L, Wu ZF, Duan DY, Cheng TY. Protein profiling of hemolymph in Haemaphysalis flava ticks. Parasit Vectors 2022; 15:179. [PMID: 35610668 PMCID: PMC9128142 DOI: 10.1186/s13071-022-05287-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 04/16/2022] [Indexed: 11/29/2022] Open
Abstract
Background Tick hemolymph bathes internal organs, acts as an exchange medium for nutrients and cellular metabolites, and offers protection against pathogens. Hemolymph is abundant in proteins. However, there has been limited integrated protein analysis in tick hemolymph thus far. Moreover, there are difficulties in differentiating tick-derived proteins from the host source. The aim of this study was to profile the tick/host protein components in the hemolymph of Haemaphysalis flava. Methods Hemolymph from adult engorged H. flava females was collected by leg amputation from the Erinaceus europaeus host. Hemolymph proteins were extracted by a filter-aided sample preparation protocol, digested by trypsin, and assayed by liquid chromatography–tandem mass spectrometry (LC–MS/MS). MS raw data were searched against the UniProt Erinaceidae database and H. flava protein database for host- and tick-derived protein identification. Protein abundance was further quantified by intensity-based absolute quantification (iBAQ). Results Proteins extracted from hemolymph unevenly varied in size with intense bands between 100 and 130 kDa. In total, 312 proteins were identified in the present study. Therein 40 proteins were identified to be host-derived proteins, of which 18 were high-confidence proteins. Top 10 abundant host-derived proteins included hemoglobin subunit-α and subunit-β, albumin, serotransferrin-like, ubiquitin-like, haptoglobin, α-1-antitrypsin-like protein, histone H2B, apolipoprotein A-I, and C3-β. In contrast, 169 were high-confidence tick-derived proteins. These proteins were classified into six categories based on reported functions in ticks, i.e., enzymes, enzyme inhibitors, transporters, immune-related proteins, muscle proteins, and heat shock proteins. The abundance of Vg, microplusin and α-2-macroglobulin was the highest among tick-derived proteins as indicated by iBAQ. Conclusions Numerous tick- and host-derived proteins were identified in hemolymph. The protein profile of H. flava hemolymph revealed a sophisticated protein system in the physiological processes of anticoagulation, digestion of blood meal, and innate immunity. More investigations are needed to characterize tick-derived proteins in hemolymph. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-022-05287-7.
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Affiliation(s)
- Lei Liu
- Research Center for Parasites & Vectors (RCPV), College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Fen Yan
- Research Center for Parasites & Vectors (RCPV), College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Lu Zhang
- Research Center for Parasites & Vectors (RCPV), College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Zhi-Feng Wu
- Research Center for Parasites & Vectors (RCPV), College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - De-Yong Duan
- Research Center for Parasites & Vectors (RCPV), College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Tian-Yin Cheng
- Research Center for Parasites & Vectors (RCPV), College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China.
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Liu L, Tang H, Duan DY, Liu JB, Wang J, Feng LL, Cheng TY. Characterization of AV422 from Haemaphysalis flava ticks in vitro. EXPERIMENTAL & APPLIED ACAROLOGY 2021; 84:809-823. [PMID: 34297228 DOI: 10.1007/s10493-021-00645-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 07/19/2021] [Indexed: 06/13/2023]
Abstract
Ticks are hematophagous ectoparasites and cause a major public health threat worldwide. Development of anti-tick vaccines is regarded to be an optimal alternative for tick control. AV422, a unique protein in ticks, is secreted into hosts during blood-feeding, but its roles are not confirmed in Haemaphysalis flava ticks. We retrieved a gene fragment encoding AV422 from a transcriptome dataset of H. flava, and based on it, we reconstructed the full length of AV422 from H. flava (Hf-AV422) by rapid amplification of cDNA ends. Expression profiles of Hf-AV422 in whole ticks and organs of different engorgement levels were determined by qPCR. Then its opening reading frame (ORF) was expressed in Escherichia coli strain BL21 (DE3). The prothrombin time (PT), activated partial thromboplastin time (APTT) and thrombin time (TT) assays were conducted to test anticoagulant activities of the purified recombinant protein (rHf-AV422). The full length of AV422 was 1152 bp. Hf-AV422 showed to be conserved as indicated by multiple sequence alignment. Expression of Hf-AV422 was significantly higher in salivary glands and cuticles than in ovaries. Its expression in whole ticks decreased during engorgement with the highest levels in 1/4 engorged ticks. rHf-AV422 prolonged PT, APTT and TT when incubated with rabbit plasma. Our data demonstrated that Hf-AV422 is a conserved salivary protein with anticoagulant activity. Further studies are needed to test in detail its functional properties to ensure it an adequate antigen candidate for the development of broad-spectrum vaccines against ticks.
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Affiliation(s)
- Lei Liu
- Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Research Center for Parasites & Vectors, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Hao Tang
- Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Research Center for Parasites & Vectors, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - De-Yong Duan
- Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Research Center for Parasites & Vectors, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Jin-Bao Liu
- Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Research Center for Parasites & Vectors, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Jie Wang
- Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Research Center for Parasites & Vectors, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Li-Li Feng
- Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Research Center for Parasites & Vectors, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Tian-Yin Cheng
- Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Research Center for Parasites & Vectors, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China.
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Wang X, Sun X, Sun Y, Chen K, Zhang K, Xu W, Fan K, Lin W, Chen T, Lin X, Lin K, Chiu HC, Huang C. Identification and molecular analysis of Ixodid ticks (Acari: Ixodidae) infesting wild boars (Sus scrofa) and tick-borne pathogens at the Meihua mountain of southwestern Fujian, China. VETERINARY PARASITOLOGY- REGIONAL STUDIES AND REPORTS 2020; 22:100492. [PMID: 33308736 DOI: 10.1016/j.vprsr.2020.100492] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 10/25/2020] [Accepted: 11/06/2020] [Indexed: 11/27/2022]
Abstract
Wildlife is essential to the biodiversity of the Meihua mountain, southwestern Fujian province, China. However, there have been few surveys of the distribution of ixodid ticks (Acari: Ixodidae) and tick-borne pathogens affecting wild animals at these locations. In this study, 1197 adult ixodid ticks infesting wild boars were collected from 10 sampling sites during 2019. Ticks were identified to species based on morphology, and the identification was confirmed based on mitochondrial 16S, ITS1 and ITS2 rRNA sequences. Eight tick species belonging to 2 genera were identified, including H. longicornis (n = 373, 31.1%), H. flava (n = 265, 22.1%), D. auratus (n = 153, 12.8%), H. hystricis (n = 119, 9.9%), D. silvarum (n = 116, 9.7%), H. bispinosa (n = 114, 9.5%), D. atrosignatus (n = 33, 2.8%), and D. taiwanensis (n = 24, 2.0%). DNA sequences of Rickettsia spp. (spotted fever group) and Babesia spp. were detected in these ticks. Phylogenetic analyses revealed the possible existence of Candidatus Rickettsia laoensis and Rickettsia raoultii. This study illustrates the potential threat to wild animals and humans from tick-borne pathogens.
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Affiliation(s)
- Xin Wang
- Fujian Provincial Key Laboratory for the Prevention & Control of Animal Infectious Diseases & Biotechnology, College of Life Sciences, Longyan University, Longyan 364012, Fujian Province, People's Republic of China
| | - Xiaoshuang Sun
- Fujian Provincial Key Laboratory for the Prevention & Control of Animal Infectious Diseases & Biotechnology, College of Life Sciences, Longyan University, Longyan 364012, Fujian Province, People's Republic of China
| | - Yankuo Sun
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, Guangdong Province, People's Republic of China
| | - Kexin Chen
- Fujian Provincial Key Laboratory for the Prevention & Control of Animal Infectious Diseases & Biotechnology, College of Life Sciences, Longyan University, Longyan 364012, Fujian Province, People's Republic of China
| | - Kaiyao Zhang
- Fujian Provincial Key Laboratory for the Prevention & Control of Animal Infectious Diseases & Biotechnology, College of Life Sciences, Longyan University, Longyan 364012, Fujian Province, People's Republic of China
| | - Weihua Xu
- Fujian Provincial Key Laboratory for the Prevention & Control of Animal Infectious Diseases & Biotechnology, College of Life Sciences, Longyan University, Longyan 364012, Fujian Province, People's Republic of China
| | - Kewei Fan
- Fujian Provincial Key Laboratory for the Prevention & Control of Animal Infectious Diseases & Biotechnology, College of Life Sciences, Longyan University, Longyan 364012, Fujian Province, People's Republic of China
| | - Weiming Lin
- Fujian Provincial Key Laboratory for the Prevention & Control of Animal Infectious Diseases & Biotechnology, College of Life Sciences, Longyan University, Longyan 364012, Fujian Province, People's Republic of China
| | - Tengteng Chen
- Fujian Meihuashan Institute of South China Tigers Breeding, Shanghang County, 364201, Fujian Province, People's Republic of China
| | - Xipan Lin
- Fujian Meihuashan Institute of South China Tigers Breeding, Shanghang County, 364201, Fujian Province, People's Republic of China
| | - Kaixiong Lin
- Fujian Meihuashan Institute of South China Tigers Breeding, Shanghang County, 364201, Fujian Province, People's Republic of China
| | - Hung-Chuan Chiu
- Fujian Provincial Key Laboratory for the Prevention & Control of Animal Infectious Diseases & Biotechnology, College of Life Sciences, Longyan University, Longyan 364012, Fujian Province, People's Republic of China.
| | - Cuiqin Huang
- Fujian Provincial Key Laboratory for the Prevention & Control of Animal Infectious Diseases & Biotechnology, College of Life Sciences, Longyan University, Longyan 364012, Fujian Province, People's Republic of China.
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Feng LL, Cheng TY. A survey of proteins in midgut contents of the tick, Haemaphysalis flava, by proteome and transcriptome analysis. EXPERIMENTAL & APPLIED ACAROLOGY 2020; 80:269-287. [PMID: 31898761 DOI: 10.1007/s10493-019-00457-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 12/24/2019] [Indexed: 06/10/2023]
Abstract
Tick blood meals are stored and digested in their midguts. Blood digestion is complex, and many proteins are involved. Study of the tick-derived proteins in the midgut content may aid in the discovery of active molecules that would be useful for anti-tick vaccines. We analyzed the midgut content proteomes of partially engorged female Haemaphysalis flava, fully engorged female H. flava, and hedgehog serum using liquid chromatography tandem-mass spectrometry and label-free quantitation. In this study, high-confidence protein profiling of tick midgut content was determined. Based on the search against our in-house transcriptome database, the 28 high-confidence proteins were identified. Of these, 17 were identified as tick-derived, and the rest were of unspecified origin (proteins that could not be differentiated as host-derived or tick-derived proteins). The function of these midgut content proteins identified here may involve nutrient transportation, anti-coagulation, erythrocyte lysis, detoxification, lipid metabolism, and immunization. The presence of hemoglobin suggested that the red blood cells were lysed in the gut lumen. The midgut contents contain a large amount of fibrinogen and it has the ability to clot immediately. The midgut contained mostly host-derived proteins, and these host proteins provide rich nutrients for tick development and reproduction. However, some intracellular proteins were also identified, suggesting the possibility of shedding of the midgut epithelium and ingestion of saliva during feeding. This finding advances our understanding of the digestive mechanism and will be useful in the screening of vaccine antigens.
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Affiliation(s)
- Li-Li Feng
- College of Veterinary Medicine, Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Hunan Agricultural University, Changsha, 410128, Hunan Province, People's Republic of China
| | - Tian-Yin Cheng
- College of Veterinary Medicine, Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Hunan Agricultural University, Changsha, 410128, Hunan Province, People's Republic of China.
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Li XY, Liu LL, Zhang M, Zhang LF, Wang XY, Wang M, Zhang KY, Liu YC, Wang CM, Xue FQ, Fei CZ. Proteomic analysis of the second-generation merozoites of Eimeria tenella under nitromezuril and ethanamizuril stress. Parasit Vectors 2019; 12:592. [PMID: 31852494 PMCID: PMC6921512 DOI: 10.1186/s13071-019-3841-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 12/09/2019] [Indexed: 12/11/2022] Open
Abstract
Background Eimeria tenella is a highly pathogenic coccidian that causes avian coccidiosis. Both nitromezuril (NZL) and ethanamizuril (EZL) are novel triazine compounds with high anticoccidial activity, but the mechanisms of their action are still unclear. This study explored the response of E. tenella to NZL and EZL by the study of changes in protein composition of the second-generation merozoites. Methods Label-free quantification (LFQ) proteomics of the second-generation merozoites of E. tenella following NZL and EZL treatment were studied by LC-MS/MS to explore the mechanisms of action. The identified proteins were annotated and analyzed by Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis and protein-protein interaction (PPI) networks analysis. Results A total of 1430 proteins were identified by LC-MS/MS, of which 375 were considered as differential proteins in response to drug treatment (DPs). There were 26 only found in the NZL treatment group (N-group), 63 exclusive to the EZL treatment group (E-group), and 80 proteins were present in both drug groups. In addition, among the DPs, the abundant proteins with significantly altered expression in response to drug treatment (SDPs) were found compared with the C-group, of which 49 were upregulated and 51 were downregulated in the N-group, and 66 upregulated and 79 downregulated in the E-group. Many upregulated proteins after drug treatment were involved in transcription and protein metabolism, and surface antigen proteins (SAGs) were among the largest proportion of the downregulated SDPs. Results showed the top two enriched GO terms and the top one enriched pathway treated with EZL and NZL were related, which indicated that these two compounds had similar modes of action. Conclusions LFQ proteomic analysis is a feasible method for screening drug-related proteins. Drug treatment affected transcription and protein metabolism, and SAGs were also affected significantly. This study provided new insights into the effects of triazine anticoccidials against E. tenella.![]()
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Affiliation(s)
- Xue-Yan Li
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China
| | - Li-Li Liu
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China
| | - Min Zhang
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China
| | - Li-Fang Zhang
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China
| | - Xiao-Yang Wang
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China
| | - Mi Wang
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China
| | - Ke-Yu Zhang
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China
| | - Ying-Chun Liu
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China
| | - Chun-Mei Wang
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China
| | - Fei-Qun Xue
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China.
| | - Chen-Zhong Fei
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, People's Republic of China.
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Guo J, Sun Y, Luo X, Li M, He P, He L, Zhao J. De novo transcriptome sequencing and comparative analysis of Haemaphysalis flava Neumann, 1897 at larvae and nymph stages. INFECTION GENETICS AND EVOLUTION 2019; 75:104008. [PMID: 31437557 DOI: 10.1016/j.meegid.2019.104008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 08/11/2019] [Accepted: 08/16/2019] [Indexed: 02/06/2023]
Abstract
Haemaphysalis flava Neumann, 1897 (H. flava) is of public health significance due to its capability of transmitting several pathogens such as Rickettsia, Ehrlichia, Bartonella and Francisella tularensis. However, lack of complete genome, transcriptome and proteome information limits the understanding of the biology of H. flava. Here, the total RNA of H. flava was collected separately at larvae and nymph stages and analyzed with high-throughput RNA sequencing technology. The obtained data were assembled and annotated based on the near origin species in the Nr database. The functions of the unigenes were annotated and classified by seven databases, including Nr, Nt, Pfam, KOG, Swiss-Prot, GO and KEGG. A total of 61,850,967 and 79,579,368 clean reads were obtained with a data bulk of 9.28 G and 11.94 G in larvae and nymph stages, respectively. The number of unigenes was 440,896, with 48.6% of them being matched to the Nr database and 51.4% remaining unknown. Additionally, 1,776,404 SNPs were identified in the unigenes. Differential analysis revealed 80 differentially expressed genes (DEGs), including 56 up-regulated genes and 24 down-regulated genes in the nymph versus larvae. qPCR confirmed 4 of the 56 up-regulated genes and 4 of the down-regulated genes. KEGG analysis of the DEGs showed that aldehyde dehydrogenase and sorbitol dehydrogenase, two up-regulated unigenes in nymph versus larvae, were both matched to the top three enriched pathways: "chloroalkane and chloroalkene degradation", "fatty acid degradation" and "glycolysis and gluconeogenesis". This is the first report on the whole transcriptome of H. flava at larvae and nymph stages. This study contributes to the understanding of H. flava at the gene expression level in different developmental stages and provides a theoretical basis for the development of vaccines against H. flava.
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Affiliation(s)
- Jiaying Guo
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, Hubei 430070, China
| | - Yali Sun
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, Hubei 430070, China
| | - Xiaoying Luo
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, Hubei 430070, China
| | - Muxiao Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, Hubei 430070, China
| | - Pei He
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, Hubei 430070, China
| | - Lan He
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei 430070, China; Key Laboratory of Animal Epidemical Disease and Infectious Zoonoses, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, Hubei 430070, China.
| | - Junlong Zhao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei 430070, China; Key Laboratory of Animal Epidemical Disease and Infectious Zoonoses, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, Hubei 430070, China.
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He XM, Liu L, Cheng TY. HSC70 from Haemaphysalis flava (Acari: Ixodidae) exerts anticoagulation activity in vitro. Ticks Tick Borne Dis 2018; 10:170-175. [PMID: 30366643 DOI: 10.1016/j.ttbdis.2018.10.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 09/20/2018] [Accepted: 10/15/2018] [Indexed: 01/30/2023]
Abstract
Ticks and tick-borne diseases are major global health threats. During blood feeding, ticks insert their hypostomes into hosts and inject an array of anticoagulant molecules to maintain fluidity of the blood-meal. These anticoagulant molecules may provide insights into understanding the feeding biology of ticks and to develop vaccines against infestations. In Haemaphysalis flava, the heat shock cognate 70 (HSC70), a member of the heat shock protein (HSP) family, is differentially expressed in salivary glands at different levels of engorgement during blood feeding. However, its function in ticks is largely not known. The present study was designed to explore the possible effects of HSC70 on the plasma. The open reading frame (ORF) of HSC70 was expressed in a prokaryotic system, and recombinant HSC70 (rHSC70) was purified and characterized. The anticoagulation activity of rHSC70 was estimated by measuring prothrombin time (PT), activated partial thromboplastin time (APTT), thrombin time (TT) and fibrinogen (FIB) with/without its inhibitor, VER155008. The results demonstrated that rHSC70 from H. flava extended TT (P < 0.001) and FIB clotting times (>300 s), but showed little effect on PT and APTT. Adding an inhibitor reversed anticlotting effects of rHSC70 on TT and FIB. These data indicate that rHSC70 is an anticoagulant agent, and the anticlotting activity likely attributes to the inhibition of thrombin and the transformation of fibrinogen into fibrin.
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Affiliation(s)
- Xiao-Ming He
- College of Veterinary Medicine, Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, Hunan Agricultural University, Changsha, 410128, China
| | - Lei Liu
- College of Veterinary Medicine, Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, Hunan Agricultural University, Changsha, 410128, China.
| | - Tian-Yin Cheng
- College of Veterinary Medicine, Hunan Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Hunan Collaborative Innovation Center for Safety Production of Livestock and Poultry, Hunan Agricultural University, Changsha, 410128, China.
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