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Han LL, Lu QQ, Li YL, Zheng WW, Ren P, Liu RD, Cui J, Wang ZQ. Application of a recombinant novel trypsin from Trichinella spiralis for serodiagnosis of trichinellosis. Parasit Vectors 2024; 17:9. [PMID: 38178167 PMCID: PMC10768479 DOI: 10.1186/s13071-023-06067-7] [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: 10/27/2023] [Accepted: 11/26/2023] [Indexed: 01/06/2024] Open
Abstract
BACKGROUND The excretory/secretory (ES) antigen of Trichinella spiralis muscle larvae (ML) is currently the most widely used diagnostic antigen to detect T. spiralis infection. However, this antigen has certain drawbacks, such as a complicated ES antigen preparation process and lower sensitivity during the early phase of infection. The aim of this study was to investigate the features of a novel T. spiralis trypsin (TsTryp) and evaluate its potential diagnostic value for trichinellosis. METHODS The TsTryp gene was cloned and recombinant TsTryp (rTsTryp) expressed. Western blotting and an enzyme-linked immunosorbent assay (ELISA) were performed to confirm the antigenicity of rTsTryp. The expression pattern and distribution signature of TsTryp at various life-cycle stages of T. spiralis were analyzed by quantitative PCR, western blotting and the immunofluorescence test. An ELISA with rTsTryp and ML ES antigens was used to detect immunoglobulins G and M (IgG, IgM) in serum samples of infected mice, swine and humans. The seropositive results were further confirmed by western blot with rTsTryp and ML ES antigens. RESULTS TsTryp expression was observed in diverse T. spiralis life-cycle phases, with particularly high expression in the early developmental phase (intestinal infectious larvae and adults), with distribution observed mainly at the nematode outer cuticle and stichosome. rTsTryp was identified by T. spiralis-infected mouse sera and anti-rTsTryp sera. Natural TsTryp protease was detected in somatic soluble and ES antigens of the nematode. In mice infected with 200 T. spiralis ML, serum-specific IgG was first detected by rTsTryp-ELISA at 8 days post-infection (dpi), reaching 100% positivity at 12 dpi, and first detected by ES-ELISA at 10 dpi, reaching 100% positivity at 14 dpi. Specific IgG was detected by rTsTryp 2 days earlier than by ES antigens. When specific IgG was determined in serum samples from trichinellosis patients, the sensitivity of rTsTryp-ELISA and ES antigens-ELISA was 98.1% (51/52 samples) and 94.2% (49/52 samples), respectively (P = 0.308), but the specificity of rTsTryp was significantly higher than that of ES antigens (98.7% vs. 95.4%; P = 0.030). Additionally, rTsTryp conferred a lower cross-reaction, with only three serum samples in total testing positive from 11 clonorchiasis, 20 cysticercosis and 24 echinococcosis patients (1 sample from each patient group). CONCLUSIONS TsTryp was shown to be an early and highly expressed antigen at intestinal T. spiralis stages, indicating that rTsTryp represents a valuable diagnostic antigen for the serodiagnosis of early Trichinella infection.
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Affiliation(s)
- Lu Lu Han
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450001, China
| | - Qi Qi Lu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450001, China
| | - Yang Li Li
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450001, China
| | - Wen Wen Zheng
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450001, China
| | - Pian Ren
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450001, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450001, China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450001, China.
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450001, China.
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Yan SW, Cheng YK, Lu QQ, Zhang R, Dan Liu R, Long SR, Wang ZQ, Cui J. Characterization of a novel dipeptidyl peptidase 1 of Trichinella spiralis and its participation in larval invasion. Acta Trop 2024; 249:107076. [PMID: 37977254 DOI: 10.1016/j.actatropica.2023.107076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 10/19/2023] [Accepted: 11/13/2023] [Indexed: 11/19/2023]
Abstract
The research aimed to describe a new Trichinella spiralis dipeptidyl peptidase 1 (TsDPP1) and investigate its functions in the larval invasion of intestinal epithelial cells (IECs). The gene TsDPP1 was successfully replicated and produced in Escherichia coli BL21 (DE3), showing a strong immune response. TsDPP1 was detected in diverse stages of T. spiralis and showed significant expression in the intestine infective larvae (IIL) and adult worms at 6 days post infection, as confirmed by qPCR and Western blot analysis. The primary localization of TsDPP1 in this parasite was observed in cuticles, stichosomes, and embryos by using the indirect immunofluorescence assay (IIFA). rTsDPP1 exhibited the enzymatic function of natural dipeptidyl peptidase and showed specific binding to IECs, and the binding site was found to be localized on cell membrane. Following transfection with dsRNA-TsDPP1, the expression of TsDPP1 mRNA and protein in muscle larvae (ML) were decreased by approximately 63.52 % and 58.68 %, correspondingly. The activity of TsDPP1 in the ML and IIL treated with dsRNA-TsDPP1 was reduced by 42.98 % and 45.07 %, respectively. The acceleration of larval invasion of IECs was observed with rTsDPP1, while the invasion was suppressed by anti-rTsDPP1 serum. The ability of the larvae treated with dsRNA-TsDPP1 to invade IECs was hindered by 31.23 %. In mice infected with dsRNA-treated ML, the intestinal IIL, and adults experienced a significant decrease in worm burdens and a noticeable reduction in adult female length and fecundity compared to the PBS group. These findings indicated that TsDPP1 significantly impedes the invasion, growth, and reproductive capacity of T. spiralis in intestines, suggesting its potential as a target for anti-Trichinella vaccines.
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Affiliation(s)
- Shu Wei Yan
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Yong Kang Cheng
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Qi Qi Lu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Ru Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China.
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China.
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Han LL, Lu QQ, Zheng WW, Li YL, Song YY, Zhang XZ, Long SR, Liu RD, Wang ZQ, Cui J. A novel trypsin of Trichinella spiralis mediates larval invasion of gut epithelium via binding to PAR2 and activating ERK1/2 pathway. PLoS Negl Trop Dis 2024; 18:e0011874. [PMID: 38166153 PMCID: PMC10786404 DOI: 10.1371/journal.pntd.0011874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 01/12/2024] [Accepted: 12/19/2023] [Indexed: 01/04/2024] Open
Abstract
BACKGROUND Proteases secreted by Trichinella spiralis intestinal infective larvae (IIL) play an important role in larval invasion and pathogenesis. However, the mechanism through which proteases mediate larval invasion of intestinal epithelial cells (IECs) remains unclear. A novel T. spiralis trypsin (TsTryp) was identified in IIL excretory/secretory (ES) proteins. It was an early and highly expressed protease at IIL stage, and had the potential as an early diagnostic antigen. The aim of this study was to investigate the biological characteristics of this novel TsTryp, its role in larval invasion of gut epithelium, and the mechanisms involved. METHODOLOGY/PRINCIPAL FINDING TsTryp with C-terminal domain was cloned and expressed in Escherichia coli BL21 (DE3), and the rTsTryp had the enzymatic activity of natural trypsin, but it could not directly degrade gut tight junctions (TJs) proteins. qPCR and western blotting showed that TsTryp was highly expressed at the invasive IIL stage. Immunofluorescence assay (IFA), ELISA and Far Western blotting revealed that rTsTryp specifically bound to IECs, and confocal microscopy showed that the binding of rTsTryp with IECs was mainly localized in the cytomembrane. Co-immunoprecipitation (Co-IP) confirmed that rTsTryp bound to protease activated receptors 2 (PAR2) in Caco-2 cells. rTsTryp binding to PAR2 resulted in decreased expression levels of ZO-1 and occludin and increased paracellular permeability in Caco-2 monolayers by activating the extracellular regulated protein kinases 1/2 (ERK1/2) pathway. rTsTryp decreased TJs expression and increased epithelial permeability, which could be abrogated by the PAR2 antagonist AZ3451 and ERK1/2 inhibitor PD98059. rTsTryp facilitated larval invasion of IECs, and anti-rTsTryp antibodies inhibited invasion. Both inhibitors impeded larval invasion and alleviated intestinal inflammation in vitro and in vivo. CONCLUSIONS TsTryp binding to PAR2 activated the ERK1/2 pathway, decreased the expression of gut TJs proteins, disrupted epithelial integrity and barrier function, and consequently mediated larval invasion of the gut mucosa. Therefore, rTsTryp could be regarded as a potential vaccine target for blocking T. spiralis invasion and infection.
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Affiliation(s)
- Lu Lu Han
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Qi Qi Lu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Wen Wen Zheng
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Yang Li Li
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Yan Yan Song
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Xin Zhuo Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
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Zhang R, Zhang XZ, Guo X, Han LL, Wang BN, Zhang X, Liu RD, Cui J, Wang ZQ. The protective immunity induced by Trichinella spiralis galectin against larval challenge and the potential of galactomannan as a novel adjuvant. Res Vet Sci 2023; 165:105075. [PMID: 37931574 DOI: 10.1016/j.rvsc.2023.105075] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/22/2023] [Accepted: 10/30/2023] [Indexed: 11/08/2023]
Abstract
Previous studies showed that recombinant Trichinella spiralis galectin (rTsgal) promoted larval invasion of gut epithelial cells, while anti-rTsgal antibodies inhibited the invasion. Galactomannan (GM) is a polysaccharide capable of regulating immune response. The aim of this study was to evaluate protective immunity induced by rTsgal immunization and the potential of GM as a novel adjuvant. The results showed that vaccination of mice with rTsgal+ISA201 and rTsgal+GM elicited a Th1/Th2 immune response. Mice immunized with rTsgal+ISA201 and rTsgal+GM exhibited significantly higher levels of serum anti-rTsgal antibodies, mucosal sIgA and cellular immune responses, but level of specific antibodies and cytokines of rTsgal+GM group was lower than the rTsgal+ISA201 group. Immunization of mice with rTsgal+ISA201 and rTsgal+GM showed a 50.5 and 40.16% reduction of intestinal adults, and 52.04 and 37.53% reduction of muscle larvae after challenge. Moreover, the numbers of goblet cells and expression level of mucin 2, Muc5ac and pro-inflammatory cytokines (TNF-α and IL-1β) in gut tissues of vaccinated mice were obviously decreased, while Th2 inducing cytokine (IL-4) expression was evidently increased. Galactomannan enhanced protective immunity, alleviated intestinal and muscle inflammation of infected mice. The results indicated that rTsgal+ISA201 vaccination induced a more prominent gut local as well as systemic immune response and protection compared to rTsgal+GM vaccination. The results suggested that Tsgal could be considered as a candidate vaccine target against Trichinella infection and galactomannan might be a potential novel candidate adjuvant of anti-Trichinella vaccines.
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Affiliation(s)
- Ru Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Xin Zhuo Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Xin Guo
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Lu Lu Han
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Bo Ning Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Xi Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China.
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China.
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Ma KN, Zhang Y, Zhang ZY, Wang BN, Song YY, Han LL, Zhang XZ, Long SR, Cui J, Wang ZQ. Trichinella spiralis galectin binding to toll-like receptor 4 induces intestinal inflammation and mediates larval invasion of gut mucosa. Vet Res 2023; 54:113. [PMID: 38012694 PMCID: PMC10680189 DOI: 10.1186/s13567-023-01246-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: 09/09/2023] [Accepted: 10/30/2023] [Indexed: 11/29/2023] Open
Abstract
Previous studies showed that Trichinella spiralis galectin (Tsgal) facilitates larval invasion of intestinal epithelium cells (IECs). However, IEC proteins binding with Tsgal were not identified, and the mechanism by which Tsgal promotes larval invasion is not clear. Toll-like receptors (TLRs) are protein receptors responsible for recognition of pathogens. The aim of this study was to investigate whether recombinant Tsgal (rTsgal) binds to TLR-4, activates inflammatory pathway in gut epithelium and mediates T. spiralis invasion. Indirect immunofluorescence (IIF), GST pull-down and co-immunoprecipitation (Co-IP) assays confirmed specific binding between rTsgal and TLR-4 in Caco-2 cells. qPCR and Western blotting showed that binding of rTsgal with TLR-4 up-regulated the TLR-4 transcription and expression in Caco-2 cells, and activated p-NF-κB p65 and p-ERK1/2. Activation of inflammatory pathway TLR-4/MAPK-NF-κB by rTsgal up-regulated pro-inflammatory cytokines (IL-1β and IL-6) and down-regulated anti-inflammatory cytokine TGF-β in Caco-2 cells, and induced intestinal inflammation. TAK-242 (TLR-4 inhibitor) and PDTC (NF-κB inhibitor) significantly inhibited the activation of TLR-4 and MAPK-NF-κB pathway. Moreover, the two inhibitors also inhibited IL-1β and IL-6 expression, and increased TGF-β expression in Caco-2 cells. In T. spiralis infected mice, the two inhibitors also inhibited the activation of TLR-4/MAPK-NF-κB pathway, ameliorated intestinal inflammation, impeded larval invasion of gut mucosa and reduced intestinal adult burdens. The results showed that rTsgal binding to TLR-4 in gut epithelium activated MAPK-NF-κB signaling pathway, induced the expression of TLR-4 and pro-inflammatory cytokines, and mediated larval invasion. Tsgal might be regarded as a candidate molecular target of vaccine against T. spiralis enteral invasive stage.
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Affiliation(s)
- Kai Ning Ma
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Yao Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Zhao Yu Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Bo Ning Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Yan Yan Song
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Lu Lu Han
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Xin Zhuo Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
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Wang Z, Lu QQ, Weng MM, Li YL, Han LL, Song YY, Shi YL, Liu RD, Cui J, Wang ZQ. Binding of Trichinella spiralis C-type lectin with syndecan-1 on intestinal epithelial cells mediates larval invasion of intestinal epithelium. Vet Res 2023; 54:86. [PMID: 37784173 PMCID: PMC10546719 DOI: 10.1186/s13567-023-01217-2] [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: 07/14/2023] [Accepted: 08/18/2023] [Indexed: 10/04/2023] Open
Abstract
C-type lectin (CTL) is a protein that binds to saccharides and plays an important role in parasite adhesion, host cell invasion and immune evasion. Previous studies showed that recombinant T. spiralis C-type lectin (rTsCTL) promotes larval invasion of intestinal epithelium cells (IEC), whereas anti-rTsCTL antibodies inhibits larval invasion. Syndecan-1 (SDC-1) is a member of the heparan sulfate proteoglycan family which is mainly expressed on the surface of IEC and in extracellular matrices where they interact with a plethora of ligands. SDC-1 has a principal role in maintaining cell morphogenesis, establishing cell-cell adhesions, and regulating the gut mucosal barrier. The aim of this study was to investigate whether rTsCTL binds to SDC-1 on IEC, and the binding of rTsCTL with SDC-1 promotes larval invasion and its mechanism. IFA results show that rTsCTL and SDC-1 co-localized on Caco-2 cell membrane. GST pull-down and Co-IP verified the direct interaction between rTsCTL and SDC-1 on Caco-2 cells. qPCR and Western blotting revealed that rTsCTL binding to SDC-1 increased the expression of SDC-1 and claudin-2, and reduced the expression of occludin and claudin-1 in Caco-2 cells incubated with rTsCTL via the STAT3 pathway. β-Xyloside (a syndecan-1 synthesis inhibitor) and Stattic (a STAT3 inhibitor) significantly inhibited rTsCTL binding to syndecan-1 in Caco-2 cells and activation of the STAT3 pathway, abrogated the effects of rTsCTL on the expression of gut tight junctions, and impeded larval invasion. The results demonstrate that binding of rTsCTL to SDC-1 on Caco-2 cells activated the STAT3 pathway, decreased gut tight junction expression, damaged the integrity of the gut epithelial barrier, and mediated T. spiralis invasion of the gut mucosa. TsCTL might be regarded as a candidate vaccine target against T. spiralis invasion and infection.
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Affiliation(s)
- Zhen Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Qi Qi Lu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Min Min Weng
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Yang Li Li
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Lu Lu Han
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Yan Yan Song
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Yu Long Shi
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
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Yan SW, Zhang R, Guo X, Wang BN, Long SR, Liu RD, Wang ZQ, Cui J. Trichinella spiralis dipeptidyl peptidase 1 suppressed macrophage cytotoxicity by promoting M2 polarization via the STAT6/PPARγ pathway. Vet Res 2023; 54:77. [PMID: 37705099 PMCID: PMC10500742 DOI: 10.1186/s13567-023-01209-2] [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: 06/02/2023] [Accepted: 07/31/2023] [Indexed: 09/15/2023] Open
Abstract
Trichinella spiralis dipeptidyl peptidase 1 (TsDPP1), or cysteine cathepsin C, is a secretory protein that is highly expressed during the infective larvae and adult worm stages in the intestines. The aim of this study was to investigate the mechanism by which recombinant TsDPP1 (rTsDPP1) activates macrophages M2 polarization and decreases macrophage cytotoxicity to kill newborn larvae via ADCC. RAW264.7 macrophages and murine peritoneal macrophages were used in this study. The results of the immunofluorescence test (IFT) and confocal microscopy showed that rTsDPP1 specifically bound to macrophages, and the binding site was localized on the cell membrane. rTsDPP1 activated macrophage M2 polarization, as demonstrated by high expression levels of Arg1 (M2 marker) and M2-related genes (IL-10, TGF-β, CD206 and Arg1) and high numbers of CD206+ macrophages. Furthermore, the expression levels of p-STAT6, STAT6 and PPARγ were obviously increased in rTsDPP1-treated macrophages, which were evidently abrogated by using a STAT6 inhibitor (AS1517499) and PPARγ antagonist (GW9662). The results indicated that rTsDPP1 promoted macrophage M2 polarization through the STAT6/PPARγ pathway. Griess reaction results revealed that rTsDPP1 suppressed LPS-induced NO production in macrophages. qPCR and flow cytometry results showed that rTsDPP1 downregulated the expression of FcγR I (CD64) in macrophages. The ability of ADCC to kill newborn larvae was significantly decreased in rTsDPP1-treated macrophages, but AS1517499 and GW9662 restored its killing capacity. Our results demonstrated that rTsDPP1 induced macrophage M2 polarization, upregulated the expression of anti-inflammatory cytokines, and inhibited macrophage-mediated ADCC via activation of the STAT6/PPARγ pathway, which is beneficial to the parasitism and immune evasion of this nematode.
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Affiliation(s)
- Shu Wei Yan
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Ru Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Xin Guo
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Bo Ning Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
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Song YY, Zhang XZ, Wang BN, Weng MM, Zhang ZY, Guo X, Zhang X, Wang ZQ, Cui J. Molecular characterization of a novel serine proteinase from Trichinella spiralis and its participation in larval invasion of gut epithelium. PLoS Negl Trop Dis 2023; 17:e0011629. [PMID: 37695792 PMCID: PMC10513378 DOI: 10.1371/journal.pntd.0011629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 09/21/2023] [Accepted: 08/30/2023] [Indexed: 09/13/2023] Open
Abstract
BACKGROUND A novel serine proteinase of Trichinells spiralis (TsSPc) has been identified in the excretion/secretion (ES) antigens, but its role in larval invasion is unclear. The aim of this study was to clone and express TsSPc, identify its biological and biochemical characteristics, and investigate its role on larval invasion of gut epithelium during T. spiralis infection. METHODOLOGY/PRINCIPAL FINDINGS TsSPc has a functional domain of serine proteinase, and its tertiary structure consists of three amino acid residues (His88, Asp139 and Ser229) forming a pocket like functional domain. Recombinant TsSPc (rTsSPc) was expressed and purified. The rTsSPc has good immunogenicity. On Western blot analysis, rTsSPc was recognized by infection serum and anti-rTsSPc serum, natural TsSPc in crude and ES antigens was identified by anti-rTsSPc serum. The results of qPCR, Western blot and indirect immunofluorescence test (IIFT) showed that TsSPc was expressed at diverse stage worms, and mainly localized at cuticle, stichosome and intrauterine embryos of this nematode. The rTsSPc had enzymatic activity of native serine protease, which hydrolyzed the substrate BAEE, casein and collagen I. After site directed mutation of enzymatic active sites of TsSPc, its antigenicity did not change but the enzyme activity was fully lost. rTsSPc specifically bound to intestinal epithelium cells (IECs) and the binding sites were mainly localized in cell membrane and cytoplasm. rTsSPc accelerated larval invasion of IECs, whereas anti-rTsSPc antibodies and TsSPc-specific dsRNA obviously hindered larval invasion. CONCLUSIONS TsSPc was a surface and secretory proteinase of the parasite, participated in larval invasion of gut epithelium, and may be considered as a candidate vaccine target molecule against Trichinella intrusion and infection.
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Affiliation(s)
- Yan Yan Song
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, PR China
| | - Xin Zhuo Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, PR China
| | - Bo Ning Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, PR China
| | - Min Min Weng
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, PR China
| | - Zhao Yu Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, PR China
| | - Xin Guo
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, PR China
| | - Xi Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, PR China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, PR China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, PR China
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Aleem MT, Wen Z, Yu Z, Chen C, Lu M, Xu L, Song X, Li X, Yan R. Inhibition of Trichinella spiralis Membrane-Associated Progesterone Receptor (MAPR) Results in a Reduction in Worm Burden. Vaccines (Basel) 2023; 11:1437. [PMID: 37766114 PMCID: PMC10535220 DOI: 10.3390/vaccines11091437] [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: 07/20/2023] [Revised: 08/27/2023] [Accepted: 08/29/2023] [Indexed: 09/29/2023] Open
Abstract
Trichinella spiralis (T. spiralis), a nematode parasite, is the major cause of Trichinellosis, a zoonotic disease. A key role of MAPR in the reproductive system is to maintain pregnancy. Previous studies found that antihormone drug design and vaccine therapy of recombinant protein (rTs-MAPRC2) control T. spiralis infection. The current study investigates the inhibitory effects of different ratios of antibodies against Ts-MAPRC2 on the development of muscle larvae (ML) and newborn larvae (NBL). First, we performed indirect immunofluorescence assays and examined the effects of rTs-MAPRC2-Ab on ML and NBL in vitro as well as in vivo. Afterward, siRNA-Ts-MAPRC2 was transfected into T. spiralis muscle larvae. Following that, Ts-MAPRC2 protein was detected by Western Blotting, and mRNA levels were determined by qPCR. We also assessed whether siRNA-treated NBLs were infective by analyzing muscle larvae burden (MLs). Our results showed that rTs-MAPRC2-Ab greatly inhibited the activity of the Ts-MAPRC2 in ML and NBL of T. spiralis and rTs-MAPRC2-Ab reduced larval infectivity and survival in the host in a dose-dependent manner (1:50, 1:200, 1:800 dilutions). Furthermore, siRNA-Ts-MAPRC2 effectively silenced the Ts-MAPRC2 gene in muscle larvae (ML) in vitro, as well as in newborn larvae (NBL) of T. spiralis in vivo. In addition, siRNA-Ts-MAPRC2 (siRNA180, siRNA419, siRNA559) reduced host larval survival and infectivity significantly. This study, therefore, suggests that Ts-MAPRC2 might be a novel molecular target useful in the development of vaccines against T. spiralis infection.
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Affiliation(s)
- Muhammad Tahir Aleem
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (M.T.A.); (Z.W.); (C.C.); (M.L.); (L.X.); (X.S.); (X.L.)
- Center for Gene Regulation in Health and Disease, Department of Biological, Geological, and Environmental Sciences, College of Sciences and Health Professions, Cleveland State University, Cleveland, OH 44115, USA
| | - Zhaohai Wen
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (M.T.A.); (Z.W.); (C.C.); (M.L.); (L.X.); (X.S.); (X.L.)
| | - Zhengqing Yu
- School of Agriculture, Ningxia University, Yinchuan 750021, China;
| | - Cheng Chen
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (M.T.A.); (Z.W.); (C.C.); (M.L.); (L.X.); (X.S.); (X.L.)
| | - Mingmin Lu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (M.T.A.); (Z.W.); (C.C.); (M.L.); (L.X.); (X.S.); (X.L.)
| | - Lixin Xu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (M.T.A.); (Z.W.); (C.C.); (M.L.); (L.X.); (X.S.); (X.L.)
| | - Xiaokai Song
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (M.T.A.); (Z.W.); (C.C.); (M.L.); (L.X.); (X.S.); (X.L.)
| | - Xiangrui Li
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (M.T.A.); (Z.W.); (C.C.); (M.L.); (L.X.); (X.S.); (X.L.)
| | - Ruofeng Yan
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (M.T.A.); (Z.W.); (C.C.); (M.L.); (L.X.); (X.S.); (X.L.)
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10
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Hao HN, Lu QQ, Wang Z, Li YL, Long SR, Dan Liu R, Cui J, Wang ZQ. Mannose facilitates Trichinella spiralis expulsion from the gut and alleviates inflammation of intestines and muscles in mice. Acta Trop 2023; 241:106897. [PMID: 36931335 DOI: 10.1016/j.actatropica.2023.106897] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 10/25/2022] [Accepted: 03/13/2023] [Indexed: 03/17/2023]
Abstract
Trichinellosis is a major zoonotic parasitosis which is a vital risk to meat food safety. It is requisite to exploit new strategy to interdict food animal Trichinella infection and to obliterate Trichinella from food animals to ensure meat safety. Mannose is an oligosaccharide that specifically binds to the carbohydrate-recognition domain of C-type lectin; it has many physiological functions including reliving inflammation and regulating immune reaction. The purpose of this study was to investigate the suppressive role of mannose on T. spiralis larval invasion and infection, its effect on intestinal and muscle inflammation, and immune responses after challenge. The results showed that compared to the saline-treated infected mice, the mannose-treated infected mice had less intestinal adult and muscle worm burdens, mild inflammation of intestine and muscle of infected mice. The levels of specific anti-Trichinella IgG (IgG1/IgG2a), IgA and sIgA in mannose-treated infected mice were obviously inferior to saline-treated infected mice (P < 0.01). Furthermore, the levels of two cytokines (IFN-γ and IL-4) in mannose-treated infected mice were also significantly lower than the saline-treated infected mice (P < 0.01). The protective effect of the mannose against Trichinella infection might be not related to specific antibody and cellular immune responses. The above results demonstrated that mannose could be considered as a novel adjuvant therapeutic agent for anti-Trichinella drugs to block larval invasion at early stage of Trichinella infection.
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Affiliation(s)
- Hui Nan Hao
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Qi Qi Lu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Zhen Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Yang Li Li
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China.
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China.
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11
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Untargeted serum metabolomics analysis of Trichinella spiralis-infected mouse. PLoS Negl Trop Dis 2023; 17:e0011119. [PMID: 36809241 PMCID: PMC9943014 DOI: 10.1371/journal.pntd.0011119] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 01/23/2023] [Indexed: 02/23/2023] Open
Abstract
BACKGROUND Trichinellosis, caused by a parasitic nematode of the genus Trichinella, is a zoonosis that affects people worldwide. After ingesting raw meat containing Trichinella spp. larvae, patients show signs of myalgia, headaches, and facial and periorbital edema, and severe cases may die from myocarditis and heart failure. The molecular mechanisms of trichinellosis are unclear, and the sensitivity of the diagnostic methods used for this disease are unsatisfactory. Metabolomics is an excellent tool for studying disease progression and biomarkers; however, it has never been applied to trichinellosis. We aimed to elucidate the impacts of Trichinella infection on the host body and identify potential biomarkers using metabolomics. METHODOLOGY/PRINCIPAL FINDINGS Mice were infected with T. spiralis larvae, and sera were collected before and 2, 4, and 8 weeks after infection. Metabolites in the sera were extracted and identified using untargeted mass spectrometry. Metabolomic data were annotated via the XCMS online platform and analyzed with Metaboanalyst version 5.0. A total of 10,221 metabolomic features were identified, and the levels of 566, 330, and 418 features were significantly changed at 2-, 4-, and 8-weeks post-infection, respectively. The altered metabolites were used for further pathway analysis and biomarker selection. A major pathway affected by Trichinella infection was glycerophospholipid metabolism, and glycerophospholipids comprised the main metabolite class identified. Receiver operating characteristic revealed 244 molecules with diagnostic power for trichinellosis, with phosphatidylserines (PS) being the primary lipid class. Some lipid molecules, e.g., PS (18:0/19:0)[U] and PA (O-16:0/21:0), were not present in metabolome databases of humans and mice, thus they may have been secreted by the parasites. CONCLUSIONS/SIGNIFICANCE Our study highlighted glycerophospholipid metabolism as the major pathway affected by trichinellosis, hence glycerophospholipid species are potential markers of trichinellosis. The findings of this study represent the initial steps in biomarker discovery that may benefit future trichinellosis diagnosis.
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12
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Xu YXY, Zhang XZ, Weng MM, Cheng YK, Liu RD, Long SR, Wang ZQ, Cui J. Oral immunization of mice with recombinant Lactobacillus plantarum expressing a Trichinella spiralis galectin induces an immune protection against larval challenge. Parasit Vectors 2022; 15:475. [PMID: 36539832 PMCID: PMC9764493 DOI: 10.1186/s13071-022-05597-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 11/23/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Trichinella spiralis is an important foodborne parasite that presents a severe threat to food safety. The development of an anti-Trichinella vaccine is an important step towards controlling Trichinella infection in food animals and thus ensure meat safety. Trichinella spiralis galectin (Tsgal) is a novel protein that has been identified on the surface of this nematode. Recombinant Tsgal (rTsgal) was found to participate in larval invasion of intestinal epithelium cells (IECs), whereas anti-rTsgal antibodies impeded the invasion. METHODS The rTsgal/pSIP409- pgsA' plasmid was constructed and transferred into Lactobacillus plantarum strain NC8, following which the in vitro biological properties of rTsgal/NC8 were determined. Five groups of mice were orally immunized three times, with a 2-week interval between immunizations, with recombinant NC8-Tsgal, recombinant NC8-Tsgal + α-lactose, empty NC8, α-lactose only or phosphate-buffered saline (PBS), respectively. The vaccinated mice were infected orally with T. spiralis larvae 2 weeks following the last vaccination. Systemic and intestinal local mucosal immune responses and protection were also assessed, as were pathological changes in murine intestine and skeletal muscle. RESULTS rTsgal was expressed on the surface of NC8-Tsgal. Oral immunization of mice with rTsgal vaccine induced specific forms of serum immunoglobulin G (IgG), namely IgG1/IgG2a, as well as IgA and gut mucosal secretion IgA (sIgA). The levels of interferon gamma and interleukin-4 secreted by cells of the spleen, mesenteric lymph nodes, Peyer's patches and intestinal lamina propria were significantly elevated at 2-6 weeks after immunization, and continued to rise following challenge. Immunization of mice with the oral rTsgal vaccine produced a significant immune protection against T. spiralis challenge, as demonstrated by a 57.28% reduction in the intestinal adult worm burden and a 53.30% reduction in muscle larval burden, compared to the PBS control group. Immunization with oral rTsgal vaccine also ameliorated intestinal inflammation, as demonstrated by a distinct reduction in the number of gut epithelial goblet cells and mucin 2 expression level in T. spiralis-infected mice. Oral administration of lactose alone also reduced adult worm and larval burdens and relieved partially inflammation of intestine and muscles. CONCLUSIONS Immunization with oral rTsgal vaccine triggered an obvious gut local mucosal sIgA response and specific systemic Th1/Th2 immune response, as well as an evident protective immunity against T. spiralis challenge. Oral rTsgal vaccine provided a prospective approach for control of T. spiralis infection.
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Affiliation(s)
- Yang Xiu Yue Xu
- grid.207374.50000 0001 2189 3846Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Xin Zhuo Zhang
- grid.207374.50000 0001 2189 3846Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Min Min Weng
- grid.207374.50000 0001 2189 3846Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Yong Kang Cheng
- grid.207374.50000 0001 2189 3846Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Ruo Dan Liu
- grid.207374.50000 0001 2189 3846Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Shao Rong Long
- grid.207374.50000 0001 2189 3846Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Zhong Quan Wang
- grid.207374.50000 0001 2189 3846Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Jing Cui
- grid.207374.50000 0001 2189 3846Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
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13
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Yue WW, Yan SW, Zhang R, Cheng YK, Liu RD, Long SR, Zhang X, Wang ZQ, Cui J. Characterization of a novel pyruvate kinase from Trichinella spiralis and its participation in sugar metabolism, larval molting and development. PLoS Negl Trop Dis 2022; 16:e0010881. [PMID: 36315477 PMCID: PMC9621426 DOI: 10.1371/journal.pntd.0010881] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 10/10/2022] [Indexed: 11/07/2022] Open
Abstract
Background Pyruvate kinase widely exists in many parasites and plays an important role in the energy production for the parasites. Pyruvate kinase might be a potential drug target for killing the parasites. The aim of the present study was to evaluate the biological characteristics and roles of T. spiralis pyruvate kinase M (TsPKM) in sugar metabolism, larval molting and development of T. spiralis. Methodology/Principal findings TsPKM has two functional domains of pyruvate kinase and the tertiary structure of TsPKM is tetramer which has the enzyme active site constituted by 8 amino-acid residues (Arg71, Asn73, Asp110, Phe241, Lys267, Glu269, Asp293 and Thr325). Recombinant TsPKM (rTsPKM) was expressed and purified. The rTsPKM had good immunogenicity. RT-PCR and Western blot showed that TsPKM was transcribed and expressed at various developmental stages in T. spiralis lifecycle. Immunofluorescence test showed that TsPKM was principally located in the cuticle, muscle, stichosome, intestine and the intrauterine embryos of female adults. rTsPKM catalyzed the reaction of phosphoenolpyruvate (PEP) and adenosine diphosphate (ADP) to produce pyruvic acid and adenosine triphosphate (ATP). TsPKM played an important role in the metabolism and energy production of T. spiralis. After silencing of TsPKM gene by specific dsRNA-TsPKM2, protein expression and enzyme activity of TsPKM decreased by 50.91 and 26.06%, respectively. After treatment with RNAi, natural TsPKM enzyme activity, larval molting, sugar metabolism, growth and development of T. spiralis were significantly reduced. Conclusions TsPKM participates in the larval molting, sugar metabolism, growth and development of T. spiralis and it might be a candidate target of therapeutic drug of trichinellosis. Pyruvate kinases belong to transferases and can transfer the high-energy phosphate bond of phosphoenolpyruvate (PEP) to adenosine diphosphate (ADP) to produce pyruvic acid and adenosine triphosphate (ATP). Pyruvate kinases play a significant biological role in the parasite survival in hosts. Our results revealed that TsPKM was expressed at various T. spiralis developmental stages, and principally located in the cuticle, stichosome, intestine and the intrauterine embryos of female adults. rTsPKM catalyzed the reaction of phosphoenolpyruvate (PEP) and adenosine diphosphate (ADP) to produce pyruvic acid and adenosine triphosphate (ATP). TsPKM played an important role in the metabolism and energy production of T. spiralis. Protein expression and enzyme activity of TsPKM were decreased by 50.91 and 26.06% respectively through silencing of TsPKM gene using specific dsRNA-TsPKM2. After treatment with RNAi and inhibitor tannin, natural TsPKM activity, larval molting, sugar metabolism, growth and development of T. spiralis were obviously inhibited. Our results showed that TsPKM participates in T. spiralis molting, sugar metabolism and development, and it might be a candidate target for anti-Trichinella drugs.
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Affiliation(s)
- Wen Wen Yue
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, People’s Republic of China
| | - Shu Wei Yan
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, People’s Republic of China
| | - Ru Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, People’s Republic of China
| | - Yong Kang Cheng
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, People’s Republic of China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, People’s Republic of China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, People’s Republic of China
| | - Xi Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, People’s Republic of China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, People’s Republic of China,* E-mail: (ZQW); (JC)
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, People’s Republic of China,* E-mail: (ZQW); (JC)
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14
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Hao HN, Song YY, Ma KN, Wang BN, Long SR, Liu RD, Zhang X, Wang ZQ, Cui J. A novel C-type lectin from Trichinella spiralis mediates larval invasion of host intestinal epithelial cells. Vet Res 2022; 53:85. [PMID: 36258242 PMCID: PMC9580147 DOI: 10.1186/s13567-022-01104-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 09/05/2022] [Indexed: 11/10/2022] Open
Abstract
The aim of this study was to investigate the characteristics of a novel type C lectin from Trichinella spiralis (TsCTL) and its role in larval invasion of intestinal epithelial cells (IECs). TsCTL has a carbohydrate recognition domain (CRD) of C-type lectin. The full-length TsCTL cDNA sequence was cloned and expressed in Escherichia coli BL21. The results of qPCR, Western blotting and immunofluorescence assays (IFAs) showed that TsCTL was a surface and secretory protein that was highly expressed at the T. spiralis intestinal infective larva (IIL) stages and primarily located at the cuticle, stichosome and embryos of the parasite. rTsCTL could specifically bind with IECs, and the binding site was localized in the IEC nucleus and cytoplasm. The IFA results showed that natural TsCTL was secreted and bound to the enteral epithelium at the intestinal stage of T. spiralis infection. The rTsCTL had a haemagglutinating effect on murine erythrocytes, while mannose was able to inhibit the rTsCTL agglutinating effect for mouse erythrocytes. rTsCTL accelerated larval intrusion into the IECs, whereas anti-rTsCTL antibodies and mannose significantly impeded larval intrusion in a dose-dependent manner. The results indicated that TsCTL specifically binds to IECs and promotes larval invasion of intestinal epithelium, and it might be a potential target of vaccines against T. spiralis enteral stages.
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Affiliation(s)
- Hui Nan Hao
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Yan Yan Song
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Kai Ning Ma
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Bo Ning Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Xi Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
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15
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Grzelak S, Bień-Kalinowska J, Stachyra A. Trichinella britovi recombinant proteins produced in Pichia pastoris expression system for specific IgG antibody detection in the sera of mice and pigs infected with Trichinella spp. Exp Parasitol 2022; 242:108386. [PMID: 36179852 DOI: 10.1016/j.exppara.2022.108386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 09/08/2022] [Accepted: 09/21/2022] [Indexed: 11/25/2022]
Abstract
Trichinellosis, a disease caused by infection with Trichinella spp, poses an economic problem in the animal sector and a recurrent health problem for humans. Discovering the new diagnostic tests may be achieved by identification and production of species- and stage-specific recombinant proteins of Trichinella genus which are recognized by the host antibodies after infection. In this study the T. britovi proteins identified earlier in excretory-secretory (ES) products: CTRL, ES21 and HSP20, were cloned and produced using a eukaryotic Pichia pastoris system. Their immunodiagnostic properties were verified by measuring the abundance of specific IgG antibodies in sera from mice and pigs experimentally infected with T. britovi or T. spiralis. The rTbCTRL and the rTbES21 proteins were more effectively produced and stable than rTbHSP20. The most sensitive protein for serodiagnostic purposes occurred to be CTRL; anti-rTbCTRL IgG level increased at 41 days post infection (dpi) in pigs infected with T. britovi and 45 dpi for those infected with T. spiralis. The rTbES21 protein was the most specific for the T. britovi species, as no antibody titers were observed in pigs infected with T. spiralis. Following the multiple-antigen strategy, the combination of rTbCTRL + rTbES21 was applied in ELISA, but no significant difference in IgG level was detected in the tested conditions.
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Affiliation(s)
- Sylwia Grzelak
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, Twarda 51/55, 00-818, Warsaw, Poland.
| | - Justyna Bień-Kalinowska
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, Twarda 51/55, 00-818, Warsaw, Poland
| | - Anna Stachyra
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, Twarda 51/55, 00-818, Warsaw, Poland
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16
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Zeng J, Zhang R, Ning Ma K, Han LL, Yan SW, Liu RD, Zhang X, Wang ZQ, Cui J. Characterization of a novel aminopeptidase P from Trichinella spiralis and its participation in the intrusion of intestinal epithelial cells. Exp Parasitol 2022; 242:108376. [PMID: 36089006 DOI: 10.1016/j.exppara.2022.108376] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 09/05/2022] [Accepted: 09/05/2022] [Indexed: 11/24/2022]
Abstract
Aminopeptidases P are metalloproteases belonging to the M24 peptidase family. It specifically hydrolyzes the N-terminus of polypeptides free of acidic amino acids, and plays an important role in the nutrition, metabolism and growth of parasites. The aim of this study was to characterize a novel Trichinella spiralis aminopeptidase P (TsAPP) and to investigate its functions in the invasion of T. spiralis. TsAPP contained two domains of creatinase (a creatinase N and creatinase N2) and a domain of peptidase M24C and APP. The complete TsAPP sequence was cloned and expressed in Escherichia coli BL21 cells. The recombinantly produced TsAPP was used to raise polyclonal antibodies that were subsequently used to detect the expression of the protein in the different life stages of T. spiralis. TsAPP was expressed in various T. spiralis stages. TsAPP was primarily localized in the cuticle, stichosome and intrauterine embryos of this nematode. rTsAPP has an enzymatic activity of a natural aminopeptidase P to hydrolyze the substrate H-Ala-Pro-OH. rTsAPP promoted the larval intrusion of intestinal epithelium cells (IECs). The results showed that TsAPP is involved in the T. spiralis intrusion of IECs and it might be a potential candidate vaccine target against Trichinella infection.
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Affiliation(s)
- Jie Zeng
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Ru Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Kai Ning Ma
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Lu Lu Han
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Shu Wei Yan
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Xi Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China.
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, PR China.
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17
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Lobanov VA, Konecsni KA, Purves RW, Scandrett WB. Performance of indirect enzyme-linked immunosorbent assay using Trichinella spiralis-derived Serpin as antigen for the detection of exposure to Trichinella spp. in swine. Vet Parasitol 2022; 309:109744. [PMID: 35777187 DOI: 10.1016/j.vetpar.2022.109744] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 05/30/2022] [Accepted: 06/07/2022] [Indexed: 11/18/2022]
Abstract
Indirect enzyme-linked immunosorbent assay (ELISA) utilizing excretory-secretory (E-S) antigens of Trichinella spiralis is currently the method of choice for testing pigs and wild boars for exposure to Trichinella spp. The E-S proteins are released by first-stage larvae (L1) of this parasitic nematode maintained in vitro. However, the production of these antigens is cumbersome and time-consuming. The process requires animals to be experimentally infected with the parasite as the source of L1. Antigen production using recombinant technology would be more time- and cost-effective. In this study, we produced a Serpin of T. spiralis as a recombinant protein secreted by the yeast Pichia pastoris. The diagnostic performance of indirect ELISA with purified Serpin antigen was compared to that of E-S ELISA. Both Serpin ELISA and E-S ELISA demonstrated 98 % diagnostic specificity in testing 1056 pigs from the Canadian Trichinella-free commercial herd. Twenty of 21 pigs with non-negative test results in E-S ELISA tested negative by the confirmatory Western blot (WB) assay. Therefore, the diagnostic specificity of combined E-S ELISA and WB was 99.9 %. Forty-five sera collected at or after six weeks from 34 pigs experimentally infected with various numbers of T. spiralis L1 produced positive results in both E-S and Serpin ELISA, resulting in 100 % diagnostic sensitivity. However, testing of sera serially collected from four pigs experimentally infected with various low doses of T. spiralis L1 demonstrated a delayed Serpin-specific antibody response compared to seroconversion detected by E-S ELISA in three animals. Moreover, Serpin ELISA demonstrated significantly lower sensitivity for detecting antibodies induced by experimental infections of pigs with T. britovi, T. nativa, Trichinella T6 and T. pseudospiralis, suggesting that it will not provide consistent detection of exposure to sylvatic Trichinella spp. The validation data support the application of Serpin ELISA in seroepidemiological surveys for detecting exposure to T. spiralis in swine.
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Affiliation(s)
- Vladislav A Lobanov
- Center for Food-borne and Animal Parasitology, Canadian Food Inspection Agency, Saskatoon, Saskatchewan, Canada.
| | - Kelly A Konecsni
- Center for Food-borne and Animal Parasitology, Canadian Food Inspection Agency, Saskatoon, Saskatchewan, Canada
| | - Randy W Purves
- Center for Veterinary Drug Residues, Canadian Food Inspection Agency, Saskatoon, Saskatchewan, Canada
| | - W Brad Scandrett
- Center for Food-borne and Animal Parasitology, Canadian Food Inspection Agency, Saskatoon, Saskatchewan, Canada
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Zhang XZ, Yue WW, Bai SJ, Hao HN, Song YY, Long SR, Dan Liu R, Cui J, Wang ZQ. Oral immunization with attenuated Salmonella encoding an elastase elicits protective immunity against Trichinella spiralis infection. Acta Trop 2022; 226:106263. [PMID: 34879232 DOI: 10.1016/j.actatropica.2021.106263] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 12/02/2021] [Accepted: 12/03/2021] [Indexed: 02/06/2023]
Abstract
Elastase belongs to the serine protease family. Previous studies showed that Trichinella spiralis elastase (TsE) was highly expressed in intestinal infective larvae (IIL). Recombinant TsE (rTsE) promoted the larval intrusion of enteral epithelium cells (IECs), whereas anti-rTsE antibodies and siRNA impeded larval intrusion. Subcutaneous vaccination of mice with rTsE showed a partial protective immunity, suggesting that TsE might be a promising vaccine target against Trichinella infection. In this study, complete TsE cDNA sequence was cloned into pcDNA3.1, and the rTsE DNA was transformed into attenuated S. typhimurium strain ΔcyaSL1344. Oral vaccination of mice with TsE DNA elicited a systemic Th1/Th2/Treg mixed immune response and gut local mucosal sIgA response. Immunized mice exhibited a significant immune protection against T. spiralis larval challenge, as demonstrated by a 52.48% reduction of enteral adult worms and a 69.43% reduction of muscle larvae. The protection might be related to the TsE-induced production of intestinal mucus, specific anti-TsE sIgA and IgG, and secretion of IFN-γ, IL-2, IL-4 and IL-10, which protected gut mucosa from larval intrusion, suppressed worm development and impeded female reproduction. The results demonstrated that attenuated Salmonella-delivered TsE DNA vaccine provided a prospective strategy for the control of Trichinella infection in food animals.
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Vaccination of mice with recombinant novel aminopeptidase P and cathepsin X alone or in combination induces protective immunity against Trichinella spiralis infection. Acta Trop 2021; 224:106125. [PMID: 34508714 DOI: 10.1016/j.actatropica.2021.106125] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/16/2021] [Accepted: 08/27/2021] [Indexed: 12/13/2022]
Abstract
Trichinella spiralis is a major foodborne zoonotic parasitic nematode which has a serious threat to meat food safety. Development of anti-Trichinella vaccine is requisite for control and elimination of Trichinella infection in food animals to ensure meat safety. Aminopeptidase P (TsAPP) and cathepsin X (TsCX) are two novel proteins identified in T. spiralis intestinal infectious L1 larvae (IIL1). The objective of this study was to investigate the protective immunity elicited by immunization with TsAPP and TsCX alone and TsAPP-TsCX in combination in a mouse model. The results demonstrate that subcutaneous vaccination of mice with rTsAPP, rTsCX or rTsAPP + rTsCX elicited a systemic humoral response (high levels of serum IgG, IgG1/IgG2a and IgA) and significant local gut mucosal sIgA responses. The vaccination with rTsAPP, rTsCX or rTsAPP + rTsCX also induced a systemic and local mixed Th1/Th2 response, as demonstrated by clear elevation levels of IFN-γ and IL-4 in vaccinated mice. Vaccination of mice with rTsAPP+rTsCX exhibited a 63.99 % reduction of intestinal adult worms and 68.50% reduction of muscle larva burdens, alleviated inflammation of intestinal mucosal and muscle tissues, and provided a higher immune protection than that of vaccination with rTsAPP or rTsCX alone. The results demonstrated that TsAPP and TsCX might be considered novel candidate target molecules for anti-Trichinella vaccines.
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Bai Y, Ma KN, Sun XY, Dan Liu R, Long SR, Jiang P, Wang ZQ, Cui J. Molecular characterization of a novel cathepsin L from Trichinella spiralis and its participation in invasion, development and reproduction. Acta Trop 2021; 224:106112. [PMID: 34453915 DOI: 10.1016/j.actatropica.2021.106112] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 07/09/2021] [Accepted: 08/13/2021] [Indexed: 12/14/2022]
Abstract
Cathepsin L is one member of cysteine protease superfamily and widely distributed in parasitic organisms, it plays the important roles in worm invasion, migration, nutrient intake, molting and immune evasion. The objective of this study was to investigate the biological characteristics of a novel cathepsin L from Trichinella spiralis (TsCL) and its role in larval invasion, development and reproduction. TsCL has a functional domain of C1 peptidase, which belongs to cathepsin L family. The complete TsCL sequence was cloned and expressed in Escherichia coli BL21. The rTsCL has good immunogenicity. RT-PCR and Western blotting analysis showed that TsCL was transcribed and expressed at different T. spiralis phases (e.g., muscle larvae, intestinal infectious larvae, adult worms and newborn larvae). Immunofluorescence test revealed that TsCL was principally localized in the cuticle, stichosome, midgut and female intrauterine embryos of the nematode. rTsCL has the capacity to specially bind with intestinal epithelial cells (IECs) and the binding sites was located in the cytoplasm. rTsCL promoted larval penetration into IEC, while anti-rTsCL antibodies inhibited the invasion. The silencing of TsCL gene by specific dsRNA significantly reduced the TsCL expression and enzyme activity, and also reduced larval invasive ability, development and female reproduction. The results showed that TsCL is an obligatory protease in T. spiralis lifecycle. TsCL participates in worm invasion, development and reproduction, and may be regarded as a potential candidate vaccine/drug target against T. spiralis infection.
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Zhuo TX, Wang Z, Song YY, Yan SW, Liu RD, Zhang X, Wang ZQ, Cui J. Characterization of a Novel Glutamine Synthetase From Trichinella spiralis and Its Participation in Larval Acid Resistance, Molting, and Development. Front Cell Dev Biol 2021; 9:729402. [PMID: 34616735 PMCID: PMC8488193 DOI: 10.3389/fcell.2021.729402] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 08/24/2021] [Indexed: 12/29/2022] Open
Abstract
Trichinella spiralis is a major foodborne parasite worldwide. After the encapsulated muscle larvae (ML) in meat are ingested, the ML are liberated in the stomach of the host and activated into intestinal infectious larvae (IIL), which develop into adult worm after molting four times. A novel glutamine synthetase (TsGS) was identified from T. spiralis IIL at 10 h post-infection, but its biological role in T. spiralis life cycle is not clear. The aim of this study was to investigate the biological characteristics of TsGS and its functions in larval acid resistance, molting, and development. TsGS has a glutamine synthetase (GS) catalytic domain. Complete TsGS sequence was cloned and expressed in Escherichia coli BL21. rTsGS has good immunogenicity. qPCR and Western blotting showed that TsGS was highly expressed at IIL stage, and immunofluorescence revealed that TsGS was principally localized at the cuticle and intrauterine embryos of this nematode. rTsGS has enzymatic activity of natural GS to hydrolyze the substrate (Glu, ATP, and NH4+). Silencing of TsGS gene significantly reduced the IIL survival at pH 2.5, decreased the IIL burden, and impeded larval molting and development. The results demonstrated that TsGS participates in T. spiralis larval acid resistance, molting and development, and it might be a candidate vaccine target against Trichinella molting and development.
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Affiliation(s)
- Tong Xu Zhuo
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Zhen Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Yan Yan Song
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Shu Wei Yan
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Xi Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, China
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22
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Li J, Ding J, Liu XL, Tang B, Bai X, Wang Y, Qiao WD, Liu MY, Wang XL. Upconverting phosphor technology-based lateral flow assay for the rapid and sensitive detection of anti-Trichinella spiralis IgG antibodies in pig serum. Parasit Vectors 2021; 14:487. [PMID: 34551787 PMCID: PMC8456594 DOI: 10.1186/s13071-021-04949-2] [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: 05/27/2021] [Accepted: 08/12/2021] [Indexed: 01/31/2023] Open
Abstract
Background Trichinella spiralis is a zoonotic food-borne parasite. A disease caused by infection with T. spiralis is called trichinellosis in humans. It is important to investigate the epidemic situation and the surveillance of herds and then prevent infection in humans. Therefore, this study is to develop a rapid and sensitive diagnostic method for on-site test in domestic and wild animals. Methods Upconverting phosphor nanoparticles (UCNPs), an excellent optical label, were conjugated with the excretory-secretory (ES) antigens from T. spiralis muscle larvae (ML) or goat anti-rabbit IgG, and a lateral flow (LF) assay based on these probes (UCNPs-ES/goat anti-rabbit IgG) was developed for the rapid and sensitive detection of anti-T. spiralis IgG antibodies in pig serum. The assay is named the UPT-LF-ES assay. In addition, the probes were characterized, and the assay was optimized. A cut-off threshold of the assay was also identified by using 169 known negative pig samples. Performance of the assay to T. spiralis with different infective numbers, cross-reactivity with other parasitic infections, the single-blinded experiment, and coincidence were evaluated with the assay. Results The UPT-LF-ES assay was successfully constructed and optimized based on the probes of UCNPs-ES/goat anti-rabbit IgG. In the pigs infected with 100, 1000, and 10,000 ML, positive results were first presented at 35 days post-infection (dpi), 30 dpi, and 25 dpi, respectively. The assay had no cross-reaction with other parasitic infections. A single-blinded experiment indicated that the sensitivity and specificity of the UPT-LF-ES assay were 100% and 100%, respectively, the area under the receiver operating characteristic (ROC) curve was 1.000. In addition, the value detected by the UPT-LF-ES assay was significantly different between positive and negative samples. Moreover, compared with the “gold standard” magnetic stirrer method, the coincidence rate of the UPT-LF-ES assay was 87.27%, and the kappa (K) coefficient was 0.7454, showing a substantial agreement. Conclusions The UPT-LF-ES assay is a useful point-of-care test (POCT) with T. spiralis in the detection of pig, which contributes to preventing human trichinellosis. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-021-04949-2.
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Affiliation(s)
- Jian Li
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, OIE Collaborating Center On Foodborne Parasites in the Asian-Pacific Region, Changchun, China
| | - Jing Ding
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, OIE Collaborating Center On Foodborne Parasites in the Asian-Pacific Region, Changchun, China
| | - Xiao-Lei Liu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, OIE Collaborating Center On Foodborne Parasites in the Asian-Pacific Region, Changchun, China
| | - Bin Tang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, OIE Collaborating Center On Foodborne Parasites in the Asian-Pacific Region, Changchun, China
| | - Xue Bai
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, OIE Collaborating Center On Foodborne Parasites in the Asian-Pacific Region, Changchun, China
| | - Yang Wang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, OIE Collaborating Center On Foodborne Parasites in the Asian-Pacific Region, Changchun, China
| | - Wei-Dong Qiao
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, OIE Collaborating Center On Foodborne Parasites in the Asian-Pacific Region, Changchun, China
| | - Ming-Yuan Liu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, OIE Collaborating Center On Foodborne Parasites in the Asian-Pacific Region, Changchun, China
| | - Xue-Lin Wang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, OIE Collaborating Center On Foodborne Parasites in the Asian-Pacific Region, Changchun, China.
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23
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Fariña FA, Pasqualetti MI, Bessi C, Ercole ME, Vargas C, Arbusti P, Ayesa G, Ribicich MM. Reprint of: Comparison between Trichinella patagoniensis and Trichinella spiralis infection in BALB/c mice. Vet Parasitol 2021; 297:109542. [PMID: 34391612 DOI: 10.1016/j.vetpar.2021.109542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
In Argentina, trichinellosis is an endemic disease acquired mainly through consumption of raw pork infected with nematodes larvae from the Trichinella genus. For years, the only species involved in outbreaks in humans and pig foci in Argentina was Trichinella spiralis. In 2008 the presence of a new Trichinella taxon from a cougar (Puma concolor) was detected and recorded in the province of Rio Negro, Argentina, and the finding was established as a new species in 2012: Trichinella patagoniensis. To the best of our knowledge, there is no information available on the intestinal phase and antibody response in a susceptible host during T. patagoniensis infection. Therefore, our research has been designed to study experimental infection with T. patagoniensis compared to infection with T. spiralis in BALB/c mice. One hundred and twenty eight BALB/c mice were divided into two groups and individuals in each group were infected per os with 500 larvae of T. patagoniensis or 500 larvae of T. spiralis, respectively. After that, they were euthanized on different days. Adult worm recovery from small intestines and artificial digestion of each carcass was performed. Histopathology of small intestines was performed using hematoxylin-eosin staining. Systemic cytokines and antibody kinetics were evaluated. Intestinal adult worm recovery of T. patagoniensis and T. spiralis took place until day 17 and 25, respectively. Systemic IFN-γ, IL-10, and TNF showed significant variations in T. patagoniensis infected mice. Seroconversion was detected in animals as from 15 days post-infection (pi) for both T. patagoniensis and T. spiralis, reaching the highest OD value at 42 days pi. Similar microscopic lesions were observed in the small intestine from mice infected with the same dose of T. spiralis and T. patagoniensis. Our findings contribute new information regarding the intestinal phase and the antibody kinetics of T. patagoniensis in BALB/c mice.
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Affiliation(s)
- Fernando A Fariña
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina.
| | - Mariana I Pasqualetti
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina
| | - Clara Bessi
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina
| | - Mariano E Ercole
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina
| | - Claudia Vargas
- CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina
| | - Patricia Arbusti
- Departamento de Parasitología, Instituto Nacional de Enfermedades Infecciosas, Administración Nacional de Laboratorios e Institutos de Salud, Dr. Carlos G. Malbrán, Av. Vélez Sarsfield 563, 1281, Buenos Aires, Argentina
| | - Graciana Ayesa
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; Departamento de Parasitología, Instituto Nacional de Enfermedades Infecciosas, Administración Nacional de Laboratorios e Institutos de Salud, Dr. Carlos G. Malbrán, Av. Vélez Sarsfield 563, 1281, Buenos Aires, Argentina
| | - M Mabel Ribicich
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina
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24
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Yang DQ, Liu F, Bai Y, Zeng J, Hao HN, Yue X, Hu CX, Long SR, Liu RD, Wang ZQ, Cui J. Functional characterization of a glutathione S-transferase in Trichinella spiralis invasion, development and reproduction. Vet Parasitol 2021; 297:109128. [PMID: 32402492 DOI: 10.1016/j.vetpar.2020.109128] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 04/29/2020] [Accepted: 04/30/2020] [Indexed: 01/12/2023]
Abstract
The purpose of this study was to determine the biological function of a Trichinella spiralis glutathione S-transferase (TsGST) in larval invasion and development by RNA interference (RNAi). The TsGST-specific siRNA 366 was transfected into T. spiralis muscle larvae (ML) via electroporation. At 1 day following transfection, the larval TsGST mRNA and protein expressions were reduced by 40.09 and 65.22 % (P < 0.05), respectively. The enzymatic activity of natural TsGST in siRNA-transfected ML was also suppressed by 45% compared with PBS group (P < 0.05). Silencing of the TsGST significantly inhibited the ability of larvae to invade intestinal epithelium cells (IECs) and isolated intestine. After challenge with siRNA-366-treated ML, the infected mice exhibited a 62.82% reduction of intestinal adult worms, and 65.03 % reduction of muscle larvae compared to the PBS group. Besides, the length of adults, newborn larvae and muscle larvae was significantly shorter than that of control siRNA and PBS group; the female fecundity of siRNA 366 group was lower than those of control siRNA and PBS group (P < 0.05). The results revealed that the specific RNAi significantly reduced the expression and enzymatic activity of TsGST, inhibited the larval invasive and developmental capacity, and impaired the female fecundity. The results further confirmed that TsGST plays a crucial role in the T. spiralis life cycle and it might be a potential molecular target for anti-Trichinella vaccines.
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Affiliation(s)
- Da Qi Yang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Fang Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Ying Bai
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Jie Zeng
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Hui Nan Hao
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Xin Yue
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Chen Xi Hu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China.
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China.
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25
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Thanchomnang T, Sadaow L, Sanpool O, Intapan PM, Rodpai R, Boonroumkaew P, Janwan P, Tourtip S, Maleewong W. Development of an immunochromatographic point-of-care test for detection of IgG antibody in serodiagnosis of human trichinellosis. Int J Infect Dis 2021; 111:148-153. [PMID: 34461253 DOI: 10.1016/j.ijid.2021.08.056] [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: 07/13/2021] [Revised: 08/22/2021] [Accepted: 08/23/2021] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE Trichinellosis is a globally distributed food-borne parasitic disease. Initially, diagnosis is usually made based on clinical signs, symptoms, and history of eating raw or undercooked meat. In the present study, an immunochromatographic test (ICT) kit was developed to diagnose trichinellosis by detecting IgG antibodies in sera of infected humans. METHODS Somatic extract from Trichinella spiralis larvae was used as the antigen for the ICT kit development. Diagnostic efficacy was evaluated using human serum samples from proven trichinellosis patients, healthy persons, and those with other parasitic infections. RESULTS The diagnostic sensitivity, specificity, positive and negative predictive values and accuracy of the ICT kit were 100.0% (95%; CI 88.8 to 100.0%), 92.5% (95% CI; 86.9 to 96.2%), 73.8% (95% CI; 58.0 to 86.1%), 100.0% (95% CI; 97.3 to 100.0%) and 93.8% (95% CI; 89.2 to 96.9%), respectively. CONCLUSIONS This ICT diagnostic kit can be used as a testing tool for human trichinellosis. This test should permit rapid detection of infection to enable prompt anthelminthic treatment. It can also be used for retrospective diagnoses and field surveys based at laboratories where sophisticated equipment is lacking.
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Affiliation(s)
- Tongjit Thanchomnang
- Faculty of Medicine, Mahasarakham University, Maha Sarakham 44000, Thailand; Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Lakkhana Sadaow
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Oranuch Sanpool
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Pewpan M Intapan
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Rutchanee Rodpai
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Patcharaporn Boonroumkaew
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Penchom Janwan
- Department of Medical Technology, School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat 80161, Thailand
| | - Somjintana Tourtip
- Faculty of Medicine, Mahasarakham University, Maha Sarakham 44000, Thailand
| | - Wanchai Maleewong
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand.
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26
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Ren HN, Zhuo TX, Bai SJ, Bai Y, Sun XY, Dan Liu R, Long SR, Cui J, Wang ZQ. Proteomic analysis of hydrolytic proteases in excretory/secretory proteins from Trichinella spiralis intestinal infective larvae using zymography combined with shotgun LC-MS/MS approach. Acta Trop 2021; 216:105825. [PMID: 33421420 DOI: 10.1016/j.actatropica.2021.105825] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 12/15/2020] [Accepted: 01/02/2021] [Indexed: 01/25/2023]
Abstract
The critical step of Trichinella spiralis infection is that the muscle larvae (ML) are activated to intestinal infective larvae (IIL) which invade the intestinal columnar epithelium to further develop. The IIL excretory/secretory (ES) proteins play an important role in host-parasite interaction. Proteolytic enzymes are able to mediate the tissue invasion, thereby increasing the susceptibility of parasites to their hosts. The aim of the current study was to screen and identify the natural active proteases in T. spiralis IIL ES proteins using Western blot and gel zymography combined with liquid chromatography tandem mass spectrometry (LC-MS/MS). The T. spiralis ML and IIL ES proteins were collected from the in vitro cultures and their enzymatic acitvities were examined by gelatin zymography and azocasein degradation. The protease activities were partially inhibited by PMSF, E-64 and EDTA. Three protein bands (45, 118 and 165 kDa) of T. spiralis IIL ES proteins were identified by shotgun LC-MS/MS because they have hydrolytic activity to gelatin compared to the ML ES proteins. Total of 30 T. spiralis proteins were identified and they are mainly serine proteinases (19), but also metalloproteinases (7) and cysteine proteinases (3). The qPCR results indicated that transcription levels of four T. spiralis protease genes (two serine proteases, a cathepsin B-like cysteine proteinase and a zinc metalloproteinase) at IIL stage were obviously higher than at the ML stage. These proteolytic enzymes are directly exposed to the host intestinal milieu and they may mediate the worm invasion of enteral epithelium and escaping from the host's immune responses. The results provide the new insights into understanding of the interaction of T. spiralis with host and the invasion mechanism.
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Zhai CC, Liu XL, Bai X, Jia ZJ, Chen SH, Tian LG, Ai L, Tang B, Liu MY, Wu XP, Chen JX. Bioinformatic Prediction and Production of Four Recombinant Proteins from Different Developmental Stages of Trichinella spiralis and Testing of Their Diagnostic Sensitivity in Mice. IRANIAN JOURNAL OF PARASITOLOGY 2021; 16:122-135. [PMID: 33786054 PMCID: PMC7988681 DOI: 10.18502/ijpa.v16i1.5531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Background: Trichinellosis is a serious food-borne parasitic zoonosis, thus finding high quality antigens is the key to serodiagnosis of trichinosis. This article reports the characterization and sensitivity of four recombinant proteins expressed by four genes (Wn10, Zh68, T668, and Wm5) from different developmental stages of Trichinella spiralis for the diagnosis of trichinellosis in mice. Methods: This study was conducted in Jilin University and National Institute of Parasitic Diseases of Chinese Center for Disease Control and Prevention in 2017–2018. The structures and functions of the proteins encoded by four genes were predicted by bioinformatics analysis. The four genes were cloned and expressed, and the recombinant proteins were purified. Anti-Trichinella IgM and IgG antibodies in the sera of mice infected with T. spiralis from 1-45 d post-infection (dpi) were evaluated by ELISA. Results: The optimal antigen epitopes of four proteins (P1, P2, P3, and P4) encoded by the four genes from T- and B-cells were predicted, and four purified recombinant proteins (r-P1, r-P2, r-P3, and r-P4) were successfully produced. For IgM, the antibody levels detected by the four recombinant antigens were approximately equal to the cut-off value. Anti-Trichinella IgG antibodies were first detected by r-P1 at 8 dpi, followed by r-P2, r-P3, and r-P4 at 10 dpi, 14 dpi, and 16 dpi, respectively, and the antibody levels remained high until 45 dpi. Conclusion: The recombinant antigens r-P1, r-P2, r-P3, and r-P4 could be antigens that react with antibodies, they showed high sensitivity in the detection of anti-Trichinella IgG antibodies in mice. Among these proteins, r-P1 may be a candidate antigen for the detection of anti-Trichinella IgG antibodies in the early infection phase and exhibited the best sensitivity among the antigens.
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Affiliation(s)
- Cheng-Cheng Zhai
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, WHO Collaborating Center for Tropical Diseases, Key Laboratory of Parasite and Vector Biology, National Health and Family Planning Commission, Shanghai 200025, China.,Editorial Department of Chinese Journal of Clinical Medicine, Department of Research, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Xiao-Lei Liu
- Key Laboratory for Zoonoses Research, Ministry of Education, Institute of Zoonoses, Jilin University, Changchun 130062, China
| | - Xue Bai
- Key Laboratory for Zoonoses Research, Ministry of Education, Institute of Zoonoses, Jilin University, Changchun 130062, China
| | - Ze-Jun Jia
- Editorial Department of Chinese Journal of Clinical Medicine, Department of Research, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Shao-Hong Chen
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, WHO Collaborating Center for Tropical Diseases, Key Laboratory of Parasite and Vector Biology, National Health and Family Planning Commission, Shanghai 200025, China
| | - Li-Guang Tian
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, WHO Collaborating Center for Tropical Diseases, Key Laboratory of Parasite and Vector Biology, National Health and Family Planning Commission, Shanghai 200025, China
| | - Lin Ai
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, WHO Collaborating Center for Tropical Diseases, Key Laboratory of Parasite and Vector Biology, National Health and Family Planning Commission, Shanghai 200025, China
| | - Bin Tang
- Key Laboratory for Zoonoses Research, Ministry of Education, Institute of Zoonoses, Jilin University, Changchun 130062, China
| | - Ming-Yuan Liu
- Key Laboratory for Zoonoses Research, Ministry of Education, Institute of Zoonoses, Jilin University, Changchun 130062, China
| | - Xiu-Ping Wu
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, WHO Collaborating Center for Tropical Diseases, Key Laboratory of Parasite and Vector Biology, National Health and Family Planning Commission, Shanghai 200025, China
| | - Jia-Xu Chen
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, WHO Collaborating Center for Tropical Diseases, Key Laboratory of Parasite and Vector Biology, National Health and Family Planning Commission, Shanghai 200025, China
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Hu CX, Zeng J, Hao HN, Xu YXY, Liu F, Liu RD, Long SR, Wang ZQ, Cui J. Biological properties and roles of a Trichinella spiralis inorganic pyrophosphatase in molting and developmental process of intestinal larval stages. Vet Res 2021; 52:6. [PMID: 33413587 PMCID: PMC7791673 DOI: 10.1186/s13567-020-00877-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 12/03/2020] [Indexed: 12/26/2022] Open
Abstract
Inorganic pyrophosphatase (PPase) participates in energy cycle and plays a vital role in hydrolysis of inorganic pyrophosphate (PPi) into inorganic phosphate (Pi). The aim of this study was to investigate the biological properties of a Trichinella spiralis PPase (TsPPase) and its role in larval molting and developmental process. The predicted TsPPase consisted of 367 amino acids with a molecular mass of 41.48 kDa and a pI of 5.76. Amino acid sequence alignment and phylogenetic analysis showed that the TsPPase gene encodes a functional family I soluble PPase with the same characteristics as prokaryotic, plant and animal/fungal soluble PPase. The rTsPPase was expressed and purified, it has the activity to catalyze the hydrolysis of PPi to Pi, and the activity was dependent on Mg2+, pH and temperature. The enzymatic activity of rTsPPase was significantly inhibited after its metal binding sites mutation. TsPPase was transcribed and expressed in all T. spiralis phases, especially in muscle larvae (ML) and intestinal infective larvae (IIL). Immunofluorescence assay (IFA) revealed that TsPPase was mainly located in cuticle and stichosome. When the ML and IIL were treated with TsPPase-specific siRNA-279, TsPPase expression and enzymatic activity were obviously reduced, the larval molting and development were also impeded. Intestinal IIL as well as AW burden, IIL molting rates from mice infected with siRNA-treated ML were obviously suppressed. The results indicated that rTsPPase possesses the enzymatic activity of native inorganic pyrophosphatase, and TsPPase plays an important role in development and molting process of intestinal T. spiralis larval stages.
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Affiliation(s)
- Chen Xi Hu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Jie Zeng
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Hui Nan Hao
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Yang Xiu Yue Xu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Fang Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
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Hu CX, Zeng J, Yang DQ, Yue X, Dan Liu R, Long SR, Zhang X, Jiang P, Cui J, Wang ZQ. Binding of elastase-1 and enterocytes facilitates Trichinella spiralis larval intrusion of the host's intestinal epithelium. Acta Trop 2020; 211:105592. [PMID: 32565198 DOI: 10.1016/j.actatropica.2020.105592] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 06/05/2020] [Accepted: 06/16/2020] [Indexed: 11/28/2022]
Abstract
Elastase-1 is one member of serine protease family, distributes in organisms widely and plays a crucial role in the invasion and development of Trichinella spiralis. In order to identify the binding of T. spiralis elastase-1 (TsEla) with host's intestinal epithelial cells (IECs) and its role in Trichinella larval intrusion, TsEla gene was cloned and expressed in our previous study. The recombinant TsEla (rTsEla) has the enzymatic activity to degrade specific peptide substrate. A specific binding between rTsEla and IECs was detected by Far Western blot and ELISA. In an in vitro invasion assay, rTsEla promoted the larval intrusion, whereas anti-rTsEla serum inhibited the larval penetration. The larval intrusion was also suppressed after the silencing of TsEla by siRNA. Silencing of TsEla gene by siRNA-291 meditated RNA interference suppressed TsEla protein expression, reduced the worm infectivity, development and reproductive capacity. These results indicated that TsEla plays an important role in the T. spiralis intrusion of host's intestinal epithelia, and it could be a prospective vaccine molecular target against T. spiralis infection.
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Affiliation(s)
- Chen Xi Hu
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China
| | - Jie Zeng
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China
| | - Da Qi Yang
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China
| | - Xin Yue
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China
| | - Xi Zhang
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China
| | - Peng Jiang
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China.
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou 450052, PR China.
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Zhang XZ, Yuan Sun X, Bai Y, Wen Yue W, Yue X, Song YY, Cui J, Wang ZQ. Immune responses in mice vaccinated with a DNA vaccine expressing a new elastase from Trichinella spiralis. Folia Parasitol (Praha) 2020; 67. [DOI: 10.14411/fp.2020.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 07/15/2020] [Indexed: 12/15/2022]
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Fariña FA, Pasqualetti MI, Bessi C, Ercole ME, Vargas C, Arbusti P, Ayesa G, Ribicich MM. Comparison between Trichinella patagoniensis and Trichinella spiralis infection in BALB/c mice. Vet Parasitol 2020; 286:109248. [PMID: 33002768 DOI: 10.1016/j.vetpar.2020.109248] [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: 02/21/2020] [Revised: 09/19/2020] [Accepted: 09/20/2020] [Indexed: 10/23/2022]
Abstract
In Argentina, trichinellosis is an endemic disease acquired mainly through consumption of raw pork infected with nematodes larvae from the Trichinella genus. For years, the only species involved in outbreaks in humans and pig foci in Argentina was Trichinella spiralis. In 2008 the presence of a new Trichinella taxon from a cougar (Puma concolor) was detected and recorded in the province of Rio Negro, Argentina, and the finding was established as a new species in 2012: Trichinella patagoniensis. To the best of our knowledge, there is no information available on the intestinal phase and antibody response in a susceptible host during T. patagoniensis infection. Therefore, our research has been designed to study experimental infection with T. patagoniensis compared to infection with T. spiralis in BALB/c mice. One hundred and twenty eight BALB/c mice were divided into two groups and individuals in each group were infected per os with 500 larvae of T. patagoniensis or 500 larvae of T. spiralis, respectively. After that, they were euthanized on different days. Adult worm recovery from small intestines and artificial digestion of each carcass was performed. Histopathology of small intestines was performed using hematoxylin-eosin staining. Systemic cytokines and antibody kinetics were evaluated. Intestinal adult worm recovery of T. patagoniensis and T. spiralis took place until day 17 and 25, respectively. Systemic IFN-γ, IL-10, and TNF showed significant variations in T. patagoniensis infected mice. Seroconversion was detected in animals as from 15 days post-infection (pi) for both T. patagoniensis and T. spiralis, reaching the highest OD value at 42 days pi. Similar microscopic lesions were observed in the small intestine from mice infected with the same dose of T. spiralis and T. patagoniensis. Our findings contribute new information regarding the intestinal phase and the antibody kinetics of T. patagoniensis in BALB/c mice.
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Affiliation(s)
- Fernando A Fariña
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina.
| | - Mariana I Pasqualetti
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina
| | - Clara Bessi
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina
| | - Mariano E Ercole
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina
| | - Claudia Vargas
- CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina
| | - Patricia Arbusti
- Departamento de Parasitología, Instituto Nacional de Enfermedades Infecciosas, Administración Nacional de Laboratorios e Institutos de Salud, Dr. Carlos G. Malbrán, Av. Vélez Sarsfield 563, 1281 Buenos Aires, Argentina
| | - Graciana Ayesa
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; Departamento de Parasitología, Instituto Nacional de Enfermedades Infecciosas, Administración Nacional de Laboratorios e Institutos de Salud, Dr. Carlos G. Malbrán, Av. Vélez Sarsfield 563, 1281 Buenos Aires, Argentina
| | - M Mabel Ribicich
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Parasitología y Enfermedades Parasitarias, Av San Martín 5285, C1417DSM CABA, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Producción Animal (INPA), Argentina
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Yue X, Sun XY, Liu F, Hu CX, Bai Y, Da Yang Q, Liu RD, Zhang X, Cui J, Wang ZQ. Molecular characterization of a Trichinella spiralis serine proteinase. Vet Res 2020; 51:125. [PMID: 32988413 PMCID: PMC7520982 DOI: 10.1186/s13567-020-00847-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 09/10/2020] [Indexed: 02/07/2023] Open
Abstract
The aim of this study was to investigate the biological characteristics and functions of a Trichinella spiralis serine proteinase (TsSerp) during larval invasion and development in the host. The full-length TsSerp cDNA sequence was cloned and expressed in Escherichia coli BL21. The results of RT-PCR, IFA and western blotting analyses showed that TsSerp was a secretory protein that was highly expressed at the T. spiralis intestinal infective larva and muscle larva stages and primarily located at the cuticle, stichosome and intrauterine embryos of the parasite. rTsSerp promoted the larval invasion of intestinal epithelial cells (IECs) and the enteric mucosa, whereas an anti-rTsSerp antibody impeded larval invasion; the promotion and obstruction roles were dose-dependently related to rTsSerp and the anti-rTsSerp antibodies, respectively. Vaccination of mice with rTsSerp elicited a remarkable humoral immune response (high levels of serum IgG, IgG1/IgG2a, IgE and IgM), and it also triggered both systemic (spleen) and local intestinal mucosal mesenteric lymph node (MLN) cellular immune responses, as demonstrated by a significant elevation in Th1 cytokines (IFN-γ) and Th2 cytokines (IL-4) after the spleen and MLN cells from vaccinated mice were stimulated with rTsSerp. Anti-TsSerp antibodies participated in the killing and destruction of newborn larvae via ADCC. The mice vaccinated with rTsSerp exhibited a 48.7% reduction in intestinal adult worms and a 52.5% reduction in muscle larvae. These results indicated that TsSerp participates in T. spiralis invasion and development in the host and might be considered a potential candidate target antigen to develop oral polyvalent preventive vaccines against Trichinella infection.
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Affiliation(s)
- Xin Yue
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Xiang Yuan Sun
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Fang Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Chen Xi Hu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Ying Bai
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Qi Da Yang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Xi Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
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Lei JJ, Hu YY, Liu F, Yan SW, Liu RD, Long SR, Jiang P, Cui J, Wang ZQ. Molecular cloning and characterization of a novel peptidase from Trichinella spiralis and protective immunity elicited by the peptidase in BALB/c mice. Vet Res 2020; 51:111. [PMID: 32891183 PMCID: PMC7487599 DOI: 10.1186/s13567-020-00838-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 08/27/2020] [Indexed: 12/15/2022] Open
Abstract
In our previous studies, a novel T. spiralis peptidase (TsP) was identified among the excretory/secretory (ES) proteins of T. spiralis intestinal infective larvae (IIL) and T. spiralis at the adult worm (AW) stage using immunoproteomics, but the biological function of TsP in the life cycle of T. spiralis is not clear. The objective of this study was to investigate the biological properties and functions of TsP in larval intrusion and protective immunity induced by immunization with rTsP. The complete TsP cDNA sequence was cloned and expressed. The results of RT-PCR, indirect immunofluorescence assay (IIFA) and western blotting revealed that TsP is a surface and secretory protein expressed in T. spiralis at different stages (muscle larvae, IIL, AWs and newborn larvae) that is principally localized at the epicuticle of the nematode. rTsP facilitated the larval intrusion of intestinal epithelial cells (IECs) and intestinal mucosa, whereas anti-rTsP antibodies suppressed larval intrusion; these facilitative and suppressive roles were dose-dependently related to rTsP or anti-rTsP antibodies. Immunization of mice with rTsP triggered an obvious humoral immune response (high levels of IgG, IgG1/IgG2a, and sIgA) and also elicited systemic (spleen) and intestinal local mucosal (mesenteric lymph node) cellular immune responses, as demonstrated by an evident increase in the cytokines IFN-γ and IL-4. Immunization of mice with rTsP reduced the numbers of intestinal adult worms by 38.6% and muscle larvae by 41.93%. These results demonstrate that TsP plays a vital role in the intrusion, development and survival of T. spiralis in hosts and is a promising candidate target molecule for anti-Trichinella vaccines.
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Affiliation(s)
- Jun Jun Lei
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Yuan Yuan Hu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Fang Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Shu Wei Yan
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Peng Jiang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
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Zhang Y, Zeng J, Song YY, Long SR, Liu RD, Jiang P, Zhang X, Cui J, Wang ZQ. Vaccination of Mice with a Novel Trypsin from Trichinella spiralis Elicits the Immune Protection against Larval Challenge. Vaccines (Basel) 2020; 8:E437. [PMID: 32764274 PMCID: PMC7564495 DOI: 10.3390/vaccines8030437] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 07/29/2020] [Accepted: 08/03/2020] [Indexed: 02/07/2023] Open
Abstract
Trichinella spiralis is a major foodborne parasite and has a serious threat to meat safety. Development of anti-Trichinella vaccines is prospective to eliminate Trichinella infection in food animal. The aim of this study was to assess the biological properties of a novel T. spiralis trypsin (TsT) and its elicited immune protection against larval challenge. The cDNA sequence of TsT gene was cloned and expressed. Western blotting showed rTsT was identified by infection serum and anti-TsT serum. RT-PCR results revealed that TsT gene was transcribed at diverse T. spiralis lifecycle stages. The IIFT results showed that natural TsT was principally expressed at epicuticle of 5-6 day adult worms, indicating that TsT is a worm somatic antigen and adult-stage specific surface antigen. Vaccination of mice with rTsT triggered an evident humoral immune response (high levels of serum IgG, IgG1/IgG2a, and enteral sIgA), and it also induced the systemic and enteral local cellular immune response, demonstrated by an significantly elevation of cytokines IFN-γ and IL-4. The mice vaccinated with rTsT exhibited a 33.17% reduction of enteral adult worms and a 37.80% reduction of muscle larvae after larval challenge. The results showed that TsT might be considered as a candidate target antigen for anti-T. spiralis vaccines.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou 450052, China; (Y.Z.); (J.Z.); (Y.Y.S.); (S.R.L.); (R.D.L.); (P.J.); (X.Z.); (J.C.)
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Guo KX, Bai Y, Ren HN, Sun XY, Song YY, Liu RD, Long SR, Zhang X, Jiang P, Wang ZQ, Cui J. Characterization of a Trichinella spiralis aminopeptidase and its participation in invasion, development and fecundity. Vet Res 2020; 51:78. [PMID: 32539772 PMCID: PMC7296678 DOI: 10.1186/s13567-020-00805-w] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 05/11/2020] [Indexed: 02/08/2023] Open
Abstract
A Trichinella spiralis aminopeptidase (TsAP) has been identified in intestinal infectious larvae (IIL) and adult worms (AW), but its biological function in the T. spiralis life cycle is unknown. The aim of this study was to characterize TsAP and ascertain its functions in the invasion, development and fecundity of T. spiralis. Recombinant TsAP (rTsAP) was expressed and purified. rTsAP has strong immunogenicity. qPCR and western blotting show that TsAP was transcribed and expressed at all T. spiralis lifecycle stages, but the expression level of TsAP mRNA and proteins at IIL and AW stages was obviously higher than those in muscle larvae (ML) and newborn larvae (NBL). The IFT results reveal that TsAP was principally located at the cuticle and the intrauterine embryos of this nematode. rTsAP had the enzymatic activity of natural aminopeptidase to hydrolyze the substrate Leu-pNA with an optimal temperature of 50 °C and optimal pH of 8.0. rTsAP promoted the larval penetration into intestinal epithelial cells, whereas anti-rTsAP antibodies suppressed the larval intrusion; the promotion and suppression was dose-dependently related to rTsAP or anti-rTsAP antibodies. TsAP protein expression level and enzymatic activity were reduced by 50.90 and 49.72% through silencing of the TsAP gene by specific siRNA 842. Intestinal AW and muscle larval burdens, worm length and female reproductive capacity were significantly declined in mice infected with siRNA-transfected ML compared to the control siRNA and PBS group. These results indicate that TsAP participates in the invasion, development and fecundity of T. spiralis and it might be a candidate target for anti-Trichinella vaccines.
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Affiliation(s)
- Kai Xia Guo
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Ying Bai
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Hua Nan Ren
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Xiang Yuan Sun
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Yan Yan Song
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Xi Zhang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Peng Jiang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
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36
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Zhang XZ, Sun XY, Bai Y, Song YY, Hu CX, Li X, Cui J, Wang ZQ. Protective immunity in mice vaccinated with a novel elastase-1 significantly decreases Trichinella spiralis fecundity and infection. Vet Res 2020; 51:43. [PMID: 32169101 PMCID: PMC7071723 DOI: 10.1186/s13567-020-00767-z] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Accepted: 03/03/2020] [Indexed: 12/29/2022] Open
Abstract
Trichinella spiralis is an important foodborne parasitic nematode that represents an enormous threat to the food safety of pork meat. The development of a preventive vaccine is valuable for the prevention and control of Trichinella infection in domestic pigs to ensure pork safety. Elastase is a trypsin-like serine protease that hydrolyzes the host's diverse tissue components and participates in parasite penetration, and it might be a novel vaccine target molecule. The aim of this study was to assess the protective immunity produced by vaccination with a novel Trichinella spiralis elastase-1 (TsE) in a mouse model. The results demonstrate that subcutaneous vaccination of mice with rTsE elicited a systemic humoral response (high levels of serum IgG and subclass IgG1/IgG2a and IgA) and significant local enteral mucosal sIgA responses. Anti-rTsE IgG recognized the native TsE at the cuticle, stichosome of intestinal infective larvae and adult worm (AW), and intrauterine embryos of female AW. The rTsE vaccination also produced a systemic and local mixed Th1/Th2 response, as demonstrated by clear elevation levels of Th1 cytokines (IFN-γ, IL-2) and Th2 cytokines (IL-4, IL-10) after spleen, mesenteric lymph node and Peyer's patch cells from immunized mice were stimulated with rTsE. The immunized mice exhibited a 52.19% reduction in enteral AW and a 64.06% reduction in muscle larvae after challenge infection. The immune response triggered by rTsE vaccination protected enteral mucosa from larval intrusion, suppressed larval development and reduced female fecundity. The results indicate that TsE may represent a novel target molecule for anti-T. spiralis vaccines.
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Affiliation(s)
- Xin Zhuo Zhang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095 China
| | - Xiang Yuan Sun
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Ying Bai
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Yan Yan Song
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Chen Xi Hu
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Xiangrui Li
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095 China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052 China
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