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Machado CDC, Alarcón-Torrecillas C, Pericacho M, Rodríguez-Escolar I, Carretón E, Montoya-Alonso JA, Morchón R. Involvement of the excretory/secretory and surface-associated antigens of Dirofilaria immitis adult worms in the angiogenic response in an in-vitro endothelial cell model. Vet Parasitol 2023; 318:109939. [PMID: 37121093 DOI: 10.1016/j.vetpar.2023.109939] [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: 03/21/2023] [Revised: 04/23/2023] [Accepted: 04/25/2023] [Indexed: 05/02/2023]
Abstract
Angiogenesis is a process by which new vessels are formed from pre-existing ones when the physiological conditions of the vascular endothelium are altered. Heartworm disease, caused by Dirofilaria immitis, causes changes in the vascular endothelium of the pulmonary arteries due to obstruction, friction, and hypoxia. The aim of this study was to analyze whether the excretory/secretory and surface-associated antigens of adult worms interact and modulates the angiogenic mechanism, viable cell number and cell migration, as well as the formation of pseudo-capillaries. Cultures of human vascular endothelial cells (HUVECs) stimulated with excretory/secretory antigens (DiES), surface-associated antigens (Cut) from D. immitis adult worms, VEFG-A (Vascular Endothelial Growth Factor A), as well as DiES+VEFG-A and Cut+VEFG-A were used. The production of VEFG-A and other proangiogenic [soluble VEFGR-2 (sVEFGR-2), membrane Endoglin (mEndoglin)] and antiangiogenic [VEFGR-1/soluble Flt (sFlt), soluble Endoglin (sEndoglin)] molecules was assessed using commercial ELISA kits. Cell viability was analyzed by live cell count and cytotoxicity assays by a commercial kit. In addition, viable cell number by MTT-based assay, cell migration by wound-healing assay carrying out scratched wounds, and the capacity of pseudo-capillary formation to analyze cell connections and cell groups in Matrigel cell cultures, were evaluated. In all cases, non‑stimulated cultures were used as controls. DiES+VEFG-A and Cut+VEFG-A significantly increased the production of VEFG-A and sVEFGR-2, and only Cut+VEFG-A significantly increased the production of VEFGR-1/sFlt compared to other groups and non-stimulated cultures. Moreover, only DiES+VEFG-A produced a significant increase in viable cell number and significant decrease cell migration, as well as in the organization and number of cell connections. Excretory/secretory and surface-associated antigens of adult D. immitis activated the angiogenic mechanism by mainly stimulating the synthesis of proangiogenic factors, and only excretory/secretory antigens increased viable cell number, activated cell migration and the formation of pseudo-capillaries. These processes could lead to vascular endothelial remodeling of the infected host and favor the long-term survival of the parasite.
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Affiliation(s)
- Cristian David Cardona Machado
- Zoonotic Diseases and One Health group, IBSAL-CIETUS (Biomedical Research Institute of Salamanca-Research Centre for Tropical Diseases University of Salamanca), Faculty of Pharmacy, University of Salamanca, 37007, Salamanca, Spain
| | - Claudia Alarcón-Torrecillas
- Department of Physiology and Pharmacology, Biomedical Research Institute of Salamanca (IBSAL), University of Salamanca, Salamanca, Spain
| | - Miguel Pericacho
- Department of Physiology and Pharmacology, Biomedical Research Institute of Salamanca (IBSAL), University of Salamanca, Salamanca, Spain
| | - Iván Rodríguez-Escolar
- Zoonotic Diseases and One Health group, IBSAL-CIETUS (Biomedical Research Institute of Salamanca-Research Centre for Tropical Diseases University of Salamanca), Faculty of Pharmacy, University of Salamanca, 37007, Salamanca, Spain
| | - Elena Carretón
- Faculty of Veterinary Medicine, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Arucas, 35413, Las Palmas, Spain
| | - José Alberto Montoya-Alonso
- Faculty of Veterinary Medicine, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Arucas, 35413, Las Palmas, Spain
| | - Rodrigo Morchón
- Zoonotic Diseases and One Health group, IBSAL-CIETUS (Biomedical Research Institute of Salamanca-Research Centre for Tropical Diseases University of Salamanca), Faculty of Pharmacy, University of Salamanca, 37007, Salamanca, Spain.
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Serrat J, Becerro-Recio D, Torres-Valle M, Simón F, Valero MA, Bargues MD, Mas-Coma S, Siles-Lucas M, González-Miguel J. Fasciola hepatica juveniles interact with the host fibrinolytic system as a potential early-stage invasion mechanism. PLoS Negl Trop Dis 2023; 17:e0010936. [PMID: 37083884 PMCID: PMC10155961 DOI: 10.1371/journal.pntd.0010936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 05/03/2023] [Accepted: 03/20/2023] [Indexed: 04/22/2023] Open
Abstract
BACKGROUND The trematode Fasciola hepatica is the most widespread causative agent of fasciolosis, a parasitic disease that mainly affects humans and ruminants worldwide. During F. hepatica infection, newly excysted juveniles (FhNEJ) emerge in the duodenum of the mammalian host and migrate towards their definitive location, the intra-hepatic biliary ducts. Understanding how F. hepatica traverses the intestinal wall and migrates towards the liver is pivotal for the development of more successful strategies against fasciolosis. The central enzyme of the mammalian fibrinolytic system is plasmin, a serine protease whose functions are exploited by a number of parasite species owing to its broad spectrum of substrates, including components of tissue extracellular matrices. The aim of the present work is to understand whether FhNEJ co-opt the functions of their host fibrinolytic system as a mechanism to facilitate trans-intestinal migration. METHODOLOGY/PRINCIPAL FINDINGS A tegument-enriched antigenic extract of FhNEJ (FhNEJ-Teg) was obtained in vitro, and its capability to bind the zymogen plasminogen (PLG) and enhance its conversion to the active protease, plasmin, were analyzed by a combination of enzyme-linked immunosorbent, chromogenic and immunofluorescence assays. Additionally, PLG-binding proteins in FhNEJ-Teg were identified by bidimensional electrophoresis coupled to mass spectrometry analysis, and the interactions were validated using FhNEJ recombinant proteins. CONCLUSIONS/SIGNIFICANCE Our results show that FhNEJ-Teg contains proteins that bind PLG and stimulate its activation to plasmin, which could facilitate the traversal of the intestinal wall by FhNEJ and contribute to the successful establishment of the parasite within its mammalian host. Altogether, our findings contribute to a better understanding of host-parasite relationships during early fasciolosis and may be exploited from a pharmacological and/or immunological perspective for the development of treatment and control strategies against this global disease.
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Affiliation(s)
- Judit Serrat
- Laboratory of Helminth Parasites of Zoonotic Importance (ATENEA), Institute of Natural Resources and Agrobiology of Salamanca (IRNASA-CSIC), Salamanca, Spain
| | - David Becerro-Recio
- Laboratory of Helminth Parasites of Zoonotic Importance (ATENEA), Institute of Natural Resources and Agrobiology of Salamanca (IRNASA-CSIC), Salamanca, Spain
| | - María Torres-Valle
- Laboratory of Helminth Parasites of Zoonotic Importance (ATENEA), Institute of Natural Resources and Agrobiology of Salamanca (IRNASA-CSIC), Salamanca, Spain
| | - Fernando Simón
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, Salamanca, Spain
| | - María Adela Valero
- Departamento de Parasitología, Facultad de Farmacia, Universidad de Valencia, Valencia, Spain
- CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos IIII, Madrid, Spain
| | - María Dolores Bargues
- Departamento de Parasitología, Facultad de Farmacia, Universidad de Valencia, Valencia, Spain
- CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos IIII, Madrid, Spain
| | - Santiago Mas-Coma
- Departamento de Parasitología, Facultad de Farmacia, Universidad de Valencia, Valencia, Spain
- CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos IIII, Madrid, Spain
| | - Mar Siles-Lucas
- Laboratory of Helminth Parasites of Zoonotic Importance (ATENEA), Institute of Natural Resources and Agrobiology of Salamanca (IRNASA-CSIC), Salamanca, Spain
| | - Javier González-Miguel
- Laboratory of Helminth Parasites of Zoonotic Importance (ATENEA), Institute of Natural Resources and Agrobiology of Salamanca (IRNASA-CSIC), Salamanca, Spain
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Philp HS, Farrell KS, Li RHL. Case report: Disseminated intravascular coagulation in a dog following treatment with melarsomine for Dirofilaria immitis. Front Vet Sci 2023; 10:1118798. [PMID: 36814463 PMCID: PMC9939911 DOI: 10.3389/fvets.2023.1118798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 01/18/2023] [Indexed: 02/08/2023] Open
Abstract
Disseminated intravascular coagulation following melarsomine therapy for Dirofilaria immitis (D. immitis) is reported in a 9-year-old female intact pit bull-type dog. The dog had been diagnosed with D. immitis (antigen and microfilaria positive) and treated with imidacloprid, moxidectin, doxycycline and 3 doses of melarsomine over a 92-day period. Seven days after the third melarsomine injection, the patient was presented to her family veterinarian due to right pelvic limb swelling. Prothrombin and activated partial thromboplastin times were prolonged beyond the detectable range. Treatment included vitamin K1 and fresh frozen plasma (FFP) prior to referral to the authors' institution. At this time the patient remained coagulopathic. Further investigations included thoracic radiographs, abdominal ultrasound and an echocardiogram. The patient was administered multiple units of packed red blood cells and FFP, sildenafil, dexamethasone SP, aminocaproic acid and vitamin K1. Repeat CBC approximately 20 h after admission showed persistent anemia and thrombocytopenia. Despite ongoing administration of FFP, a repeat coagulation panel showed worsening of the coagulopathy with prothrombin time of 84.2s [reference interval (RI) 7.0-9.3s], activated partial thromboplastin time >140s (RI 10.4-12.9s) and fibrinogen <50 mg/dL (RI 109-311 mg/dL). Following discussion with the owners, the patient was euthanized. Necropsy was performed and confirmed heartworm infection with severe pulmonary arterial thrombosis, vascular remodeling, and intraluminal degenerate nematodes. Multifocal subcutaneous and organ hemorrhage was apparent. Although coagulopathy has been described in caval syndrome associated with heartworm disease and is listed as a potential side effect of melarsomine administration, this is the first report of documented disseminated intravascular coagulation following melarsomine treatment for D. immitis. Potential mechanisms for the coagulopathy are discussed and the case report highlights a rare, but serious complication of adulticide therapy.
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Affiliation(s)
- Helen S. Philp
- William R. Pritchard Veterinary Medical Teaching Hospital, University of California, Davis, Davis, CA, United States,*Correspondence: Helen S. Philp ✉
| | - Kate S. Farrell
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
| | - Ronald H. L. Li
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
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Hemostatic Dysfunction in Dogs Naturally Infected with Angiostrongylus vasorum—A Narrative Review. Pathogens 2022; 11:pathogens11020249. [PMID: 35215192 PMCID: PMC8878016 DOI: 10.3390/pathogens11020249] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/05/2022] [Accepted: 02/11/2022] [Indexed: 01/27/2023] Open
Abstract
This narrative review aims to describe Angiostrongylus vasorum-induced hemostatic dysfunction of dogs with emphasis on clinical and laboratory findings as well as potential therapeutic strategies for the bleeding patient. Canine angiostrongylosis (CA) is a disease with potentially high morbidity and mortality in endemic areas and with fatal outcome often associated with either severe respiratory compromise, pulmonary hypertension and right-sided heart failure, or hemostatic dysfunction with severe bleeding. The most common signs of hemorrhage are hematomas, petecchiation, ecchymoses, oral mucosal membrane bleeding and scleral bleeding, while intracranial and pulmonary hemorrhage are among the most severe. The pathophysiological mechanisms underlying hemostatic dysfunction in these patients are presently researched. While the larval effect on platelets remains unknown, the parasite appears to induce dysregulation of hemostatic proteins, with studies suggesting a mixture of pro-coagulant protein consumption and hyperfibrinolysis. Importantly, not all dogs display the same hemostatic abnormalities. Consequently, characterizing the hemostatic state of the individual patient is necessary, but has proven difficult with traditional coagulation tests. Global viscoelastic testing shows promise, but has limited availability in general practice. Treatment of A. vasorum-infected dogs with hemostatic dysfunction relies on anthelmintic treatment as well as therapy directed at the individual dog’s specific hemostatic alterations.
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Gillis-Germitsch N, Kockmann T, Asmis LM, Tritten L, Schnyder M. The Angiostrongylus vasorum Excretory/Secretory and Surface Proteome Contains Putative Modulators of the Host Coagulation. Front Cell Infect Microbiol 2021; 11:753320. [PMID: 34796127 PMCID: PMC8593241 DOI: 10.3389/fcimb.2021.753320] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 10/08/2021] [Indexed: 01/25/2023] Open
Abstract
Angiostrongylus vasorum is a cardiopulmonary nematode of canids and is, among others, associated with bleeding disorders in dogs. The pathogenesis of such coagulopathies remains unclear. A deep proteomic characterization of sex specific A. vasorum excretory/secretory proteins (ESP) and of cuticular surface proteins was performed, and the effect of ESP on host coagulation and fibrinolysis was evaluated in vitro. Proteins were quantified by liquid chromatography coupled to mass spectrometry and functionally characterized through gene ontology and pathway enrichment analysis. In total, 1069 ESP (944 from female and 959 from male specimens) and 1195 surface proteins (705 and 1135, respectively) were identified. Among these were putative modulators of host coagulation, e.g., von Willebrand factor type D domain protein orthologues as well as several proteases, including serine type proteases, protease inhibitors and proteasome subunits. The effect of ESP on dog coagulation and fibrinolysis was evaluated on canine endothelial cells and by rotational thromboelastometry (ROTEM). After stimulation with ESP, tissue factor and serpin E1 transcript expression increased. ROTEM revealed minimal interaction of ESP with dog blood and ESP did not influence the onset of fibrinolysis, leading to the conclusion that Angiostrongylus vasorum ESP and surface proteins are not solely responsible for bleeding in dogs and that the interaction with the host's vascular hemostasis is limited. It is likely that coagulopathies in A. vasorum infected dogs are the result of a multifactorial response of the host to this parasitic infection.
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Affiliation(s)
- Nina Gillis-Germitsch
- Institute of Parasitology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.,Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | - Tobias Kockmann
- Functional Genomics Center Zurich, Swiss Federal Institute of Technology Zurich (ETH Zurich), University of Zurich, Zurich, Switzerland
| | - Lars M Asmis
- Center for Perioperative Thrombosis and Hemostasis, Zurich, Switzerland
| | - Lucienne Tritten
- Institute of Parasitology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Manuela Schnyder
- Institute of Parasitology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
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Host-Parasite Relationships in Porcine Ascariosis: Anticoagulant Potential of the Third Larval Stage of Ascaris suum as a Possible Survival Mechanism. Animals (Basel) 2021; 11:ani11030804. [PMID: 33805634 PMCID: PMC8002170 DOI: 10.3390/ani11030804] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/08/2021] [Accepted: 03/10/2021] [Indexed: 12/23/2022] Open
Abstract
Simple Summary Ascaris suum parasitises pigs all over the world causing a disease responsible for producing reductions in weight gains and damages to several organs of the infected animals that incur huge economic losses for the swine industry. While adult worms of this parasite are located in the small intestine of the host, their larval stages migrate through the bloodstream as an evolutionary advantageous strategy within a hostile environment that confronts host responses such as blood clots formation. The aim of this work is to study the ability of A. suum larvae to inhibit blood coagulation as a possible mechanism to control blood clots formation and facilitate their migration. The results showed that these larvae inhibited host blood coagulation and possessed molecules similar to those responsible for inhibiting blood coagulation in pigs. The anticoagulant effect of A. suum larvae could constitute a potential survival mechanism for the parasite. Therefore, developing new control strategies directed at this and similar processes could avoid A. suum larval migration and the establishment of adult worms in their definitive location, which is necessary to confront the damages and economic losses produced by this parasitosis. Abstract In order to evade the response of their hosts, helminth parasites have evolved precise and highly regulated mechanisms, including migration strategies of the larval stages. In regard to porcine ascariosis caused by Ascaris suum, its infective third-stage larvae (AsL3) undergo a complex migratory route through the bloodstream of their host before establishing in the small intestine to reach maturation. Despite the benefits attributed to this migration, blood clots formation could compromise larvae survival. The aim of this work was to study the interaction between the cuticle and excretory/secretory antigens of AsL3 and the host coagulation cascade. Larvae were obtained after incubating and hatching A. suum eggs, after which the antigenic extracts were produced. Their ability to disrupt the coagulation cascade was studied using anticoagulation and chromogenic assays, and techniques based on electrophoresis. The obtained results showed that both antigenic extracts possessed anticoagulant potential, being able to inhibit the intrinsic, extrinsic and/or common pathways of the blood coagulation cascade as well as the activated factor X. Moreover, three A. suum serpin proteins were identified as candidates to inhibit this host coagulation factor. To the best of our knowledge, this study shows, for the first time, the anticoagulant potential of the infective larvae of A. suum, which could be used by the parasite as a mechanism to facilitate its invasion and survival in the host.
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Maruszewska-Cheruiyot M, Szewczak L, Krawczak-Wójcik K, Głaczyńska M, Donskow-Łysoniewska K. The production of excretory-secretory molecules from Heligmosomoides polygyrus bakeri fourth stage larvae varies between mixed and single sex cultures. Parasit Vectors 2021; 14:106. [PMID: 33557937 PMCID: PMC7871589 DOI: 10.1186/s13071-021-04613-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 01/28/2021] [Indexed: 01/06/2023] Open
Abstract
Background Excretory-secretory (ES) products are crucial in maintaining helminths in the host. Consequently, the proteins of ES are potential vaccine molecules and potential therapeutic agents for autoimmune diseases. Heligmosomoides polygyrus bakeri, a gastrointestinal parasite of mice, is a model of hookworm infection in humans. ES produced by both sexes of H. polygyrus bakeri L4 stage cultured separately shows different immunomodulatory properties than ES obtained when both sexes are cultured together. Accordingly, the objective of this study was to identify and compare the excretory-secretory molecules from single-sex and mixed cultures. Methods The composition of ES of male and female L4 stage nematodes in the presence (cultured together) or absence (cultured alone) of the opposite sex was examined. Proteins were identified using mass spectrometry. The functions of identified proteins were explored with Blast2GO. Results A total of 258 proteins derived from mixed larval culture in the presence of sex pheromones were identified, 160 proteins from pure female cultures and 172 from pure male cultures. Exposure of nematodes to the sex pheromones results in abundant production of proteins with immunomodulatory properties such as Val proteins, acetylcholinesterases, TGF-β mimic 9 and HpARI. Proteins found only in ES from mixed larval cultures were TGF-β mimics 6 and 7 as well as galectin. Conclusions The presence of the opposite sex strongly influences the composition of ES products, probably by chemical (pheromone) communication between individuals. However, examination of the composition of ES from various conditions gives an opportunity for searching for new potentially therapeutic compounds and anthelminthics as well as components of vaccines. Manipulation of the nematode environment might be important for the studies on the immunomodulatory potential of nematodes.![]()
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Affiliation(s)
- Marta Maruszewska-Cheruiyot
- Laboratory of Parasitology, General Karol Kaczkowski Military Institute of Hygiene and Epidemiology, Warsaw, Poland.
| | - Ludmiła Szewczak
- Laboratory of Parasitology, General Karol Kaczkowski Military Institute of Hygiene and Epidemiology, Warsaw, Poland
| | - Katarzyna Krawczak-Wójcik
- Laboratory of Parasitology, General Karol Kaczkowski Military Institute of Hygiene and Epidemiology, Warsaw, Poland
| | - Magdalena Głaczyńska
- Laboratory of Parasitology, General Karol Kaczkowski Military Institute of Hygiene and Epidemiology, Warsaw, Poland
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Zawistowska-Deniziak A, Powązka K, Pękacz M, Basałaj K, Klockiewicz M, Wiśniewski M, Młocicki D. Immunoproteomic Analysis of Dirofilaria repens Microfilariae and Adult Parasite Stages. Pathogens 2021; 10:pathogens10020174. [PMID: 33562513 PMCID: PMC7914743 DOI: 10.3390/pathogens10020174] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 01/22/2021] [Accepted: 01/27/2021] [Indexed: 12/19/2022] Open
Abstract
Dirofilariarepens is a parasitic nematode causing a vector-borne zoonotic infection (dirofilariosis), considered an emerging problem in human and veterinary medicine. Currently, diagnosis is based on the detection of the adult parasite and microfilariae in the host tissues. However, the efficacy of tests relying on microfilariae detection is limited by microfilariae periodic occurrence. Therefore, a new reliable and affordable serological diagnostic method is needed. Better characteristic of the parasite biology and its interaction with host immune system should help to achieve this goal. This study analyzes adult and microfilariae proteomes, and the use of one-dimensional electrophoresis (1-DE) and two-dimensional electrophoresis (2-DE) proteomics, immunoproteomics, and LC-MS/MS mass spectrometry allowed us to identify 316 potentially immunogenic proteins (75 belong to adult stage, 183 to microfilariae, and 58 are common for both). Classified by their ontology, the proteins showed important similarities and differences between both parasite stages. The most frequently identified proteins are structural, metabolic, and heat shock proteins. Additionally, real-time PCR analysis of some immunogenic targets revealed significant differences between microfilariae and adult life stages. We indicated molecules involved in parasite-host interactions and discussed their importance in parasite biology, which may help to reveal potential diagnostic antigens or select drug and vaccine targets.
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Affiliation(s)
- Anna Zawistowska-Deniziak
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, 00-818 Warsaw, Poland; (K.P.); (M.P.); (K.B.); (D.M.)
- Correspondence: ; Tel.: +48-22-697-89-66
| | - Katarzyna Powązka
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, 00-818 Warsaw, Poland; (K.P.); (M.P.); (K.B.); (D.M.)
| | - Mateusz Pękacz
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, 00-818 Warsaw, Poland; (K.P.); (M.P.); (K.B.); (D.M.)
- Division of Parasitology, Department of Preclinical Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-786 Warsaw, Poland; (M.K.); (M.W.)
| | - Katarzyna Basałaj
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, 00-818 Warsaw, Poland; (K.P.); (M.P.); (K.B.); (D.M.)
| | - Maciej Klockiewicz
- Division of Parasitology, Department of Preclinical Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-786 Warsaw, Poland; (M.K.); (M.W.)
| | - Marcin Wiśniewski
- Division of Parasitology, Department of Preclinical Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-786 Warsaw, Poland; (M.K.); (M.W.)
| | - Daniel Młocicki
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, 00-818 Warsaw, Poland; (K.P.); (M.P.); (K.B.); (D.M.)
- Department of General Biology and Parasitology, Medical University of Warsaw, 02-004 Warsaw, Poland
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Immunoreactive Proteins in the Esophageal Gland Cells of Anisakis Simplex Sensu Stricto Detected by MALDI-TOF/TOF Analysis. Genes (Basel) 2020; 11:genes11060683. [PMID: 32580523 PMCID: PMC7349779 DOI: 10.3390/genes11060683] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/18/2020] [Accepted: 06/19/2020] [Indexed: 01/15/2023] Open
Abstract
In plant and animal nematode parasites, proteins derived from esophageal gland cells have been shown to be important in the host-nematodes relationship but little is known about the allergenic potential of these proteins in the genus Anisakis. Taking into account the increase of anisakiasis and allergies related to these nematodes, immunoreactive properties of gland cell proteins were investigated. Two hundred ventricles were manually dissected from L3 stage larvae of Aniskakis simplex s.s. to allow direct protein analysis. Denaturing gel electrophoresis followed by monochromatic silver staining which revealed the presence of differential (enriched) proteins when compared to total nematode extracts. Such comparison was performed by means of 1D and 2D electrophoresis. Pooled antisera from Anisakis spp.-allergic patients were used in western blots revealing the presence of 13 immunoreactive bands in the ventricular extracts in 1D, with 82 spots revealed in 2D. The corresponding protein bands and spots were excised from the silver-stained gel and protein assignation was made by MALDI-TOF/TOF. A total of 13 (including proteoforms) were unambiguously identified. The majority of these proteins are known to be secreted by nematodes into the external environment, of which three are described as being major allergens in other organisms with different phylogenetic origin and one is an Anisakis simplex allergen.
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Angiogenesis in cardiopulmonary dirofilariosis: does the Wolbachia surface protein have a pro- or anti-angiogenic effect? J Helminthol 2020; 94:e162. [PMID: 32519634 DOI: 10.1017/s0022149x20000450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Cardiopulmonary dirofilariosis caused by Dirofilaria immitis produces inflammation, blood vessel obstruction and hypoxia, which are required conditions for the beginning of the process of neovascularization. Since D. immitis harbours intracellular symbiotic Wolbachia bacterium, the global understanding of the angiogenic process requires the analysis of the effect of the parasite molecules, but also that of Wolbachia. Canine primary lung microvascular endothelial cells were treated with the recombinant Wolbachia surface protein (rWSP) and the expression of angiogenic factors like Vascular Endothelial Growth Factor-A (VEGF-A), sFlt, membrane Endoglin (mEndoglin) and soluble Endoglin (sEndoglin), as well as the in vitro formation of pseudocapillaries, were measured. The analyses showed a significant increase in the expression of pro-angiogenic VEGF-A and anti-angiogenic sEndoglin, together with a significant decrease in both pro-angiogenic mEndoglin and pseudocapillary formation, compared to untreated controls. Due to the complexity of the angiogenic process and its relationship with other physiological processes like inflammation and fibrinolysis, these results might suggest that rWSP participate in various mechanisms related to each other and its effects might depend either on the balance between them or on the moment of their occurrence.
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Diosdado A, Simón F, Morchón R, González-Miguel J. Pro-fibrinolytic potential of the third larval stage of Ascaris suum as a possible mechanism facilitating its migration through the host tissues. Parasit Vectors 2020; 13:203. [PMID: 32312291 PMCID: PMC7169012 DOI: 10.1186/s13071-020-04067-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Accepted: 04/09/2020] [Indexed: 12/24/2022] Open
Abstract
Background Ascaris roundworms are the parasitic nematodes responsible for causing human and porcine ascariasis. Whereas A. lumbricoides is the most common soil-transmitted helminth infecting humans in the world, A. suum causes important economic losses in the porcine industry. The latter has been proposed as a model for the study of A. lumbricoides since both species are closely related. The third larval stage of these parasites carries out an intriguing and complex hepatopulmonary route through the bloodstream of its hosts. This allows the interaction between larvae and the physiological mechanisms of the hosts circulatory system, such as the fibrinolytic system. Parasite migration has been widely linked to the activation of this system by pathogens that are able to bind plasminogen and enhance plasmin generation. Therefore, the aim of this study was to examine the interaction between the infective third larval stage of A. suum and the host fibrinolytic system as a model of the host-Ascaris spp. relationships. Methods Infective larvae were obtained after incubating and hatching fertile eggs of A. suum in order to extract their cuticle and excretory/secretory antigens. The ability of both extracts to bind and activate plasminogen, as well as promote plasmin generation were assayed by ELISA and western blot. The location of plasminogen binding on the larval surface was revealed by immunofluorescence. The plasminogen-binding proteins from both antigenic extracts were revealed by two-dimensional electrophoresis and plasminogen-ligand blotting, and identified by mass spectrometry. Results Cuticle and excretory/secretory antigens from infective larvae of A. suum were able to bind plasminogen and promote plasmin generation in the presence of plasminogen activators. Plasminogen binding was located on the larval surface. Twelve plasminogen-binding proteins were identified in both antigenic extracts. Conclusions To the best of our knowledge, the present results showed for the first time, the pro-fibrinolytic potential of infective larvae of Ascaris spp., which suggests a novel parasite survival mechanism by facilitating the migration through host tissues.![]()
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Affiliation(s)
- Alicia Diosdado
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, C/Licenciado Méndez Nieto s/n, 37007, Salamanca, Spain
| | - Fernando Simón
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, C/Licenciado Méndez Nieto s/n, 37007, Salamanca, Spain.
| | - Rodrigo Morchón
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, C/Licenciado Méndez Nieto s/n, 37007, Salamanca, Spain
| | - Javier González-Miguel
- Laboratory of Parasitology, Institute of Natural Resources and Agrobiology of Salamanca (IRNASA-CSIC), C/Cordel de Merinas 40-52, 37008, Salamanca, Spain.,Martsinovsky Institute of Medical Parasitology, Tropical and Vector Borne Diseases, Sechenov University, Malaya Pirogovskaya St. 20-1, Moscow, 119435, Russia
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12
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Wang D, Xiao Q, Zhang W, Wang X, Xue X, Zhang X, Yu Z, Zhao Y, Liu J, Wang H. Landscape of ubiquitination events that occur in host skin in response to tick (Haemaphysalis longicornis) bitten. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2020; 104:103572. [PMID: 31838045 DOI: 10.1016/j.dci.2019.103572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 11/11/2019] [Accepted: 12/10/2019] [Indexed: 06/10/2023]
Abstract
Ticks are major parasites of domestic livestock, wildlife, and humans. After a tick bite, diverse cutaneous manifestations initially occur in the bitten area in the host. In this study, a label-free proteomics approach was applied to identify the differentially ubiquitinated proteins (DUPs) induced by tick-bitten in the skin. In total, 113 proteins were ubiquitinated in rabbit skin during tick bitten period, among which the ubiquitination levels of 43 proteins were altered. These DUPs in skin subjected to tick-bitten were enriched in metabolic processes, immune processes, and protein degradation processes. Bioinformatic analysis suggested that tick bitten may regulate the glycolysis pathway in host skin via differential ubiquitination of GAPDH, HK1 and TPI1, while regulate the ubiquitin-proteasome system, the MHC-I and MHC-II antigen-presenting pathways, and the HIF-1 signaling pathway via differential ubiquitination of MEK1, PSMC3, PSMA6, MHC-II and PSMD1. Moreover, PSMC3, PSMA6, PSMD1 and MEK1 were demonstrated as novel targets of ubiquitination. This study provides the first overview of ubiquitination in host skin affected by tick bitten and broadens our knowledge of the molecular mechanism involved in tick bitten.
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Affiliation(s)
- Duo Wang
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China
| | - Qi Xiao
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China
| | - Weiqi Zhang
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China
| | - Xiaoshuang Wang
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China
| | - Xiaomin Xue
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China
| | - Xiaoli Zhang
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China
| | - Zhijun Yu
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China
| | - Yinan Zhao
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China
| | - Jingze Liu
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China.
| | - Hui Wang
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, PR China.
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Dirofilaria immitis possesses molecules with anticoagulant properties in its excretory/secretory antigens. Parasitology 2020; 147:559-565. [DOI: 10.1017/s0031182020000104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
AbstractDirofilaria immitis is a parasitic nematode that survives in the circulatory system of suitable hosts for many years, causing the most severe thromboembolisms when simultaneous death of adult worms occurs. The two main mechanisms responsible for thrombus formation in mammals are the activation and aggregation of platelets and the generation of fibrin through the coagulation cascade. The aim of this work was to study the anticoagulant potential of excretory/secretory antigens from D. immitis adult worms (DiES) on the coagulation cascade of the host. Anticoagulant and inhibition assays respectively showed that DiES partially alter the coagulation cascade of the host and reduce the activity of the coagulation factor Xa, a key enzyme in the coagulation process. In addition, a D. immitis protein was identified by its similarity to the homologous serpin 6 from Brugia malayi as a possible candidate to form an inhibitory complex with FXa by sodium dodecyl sulfate polyacrylamide gel electrophoresis and mass spectrometry. These results indicate that D. immitis could use the anticoagulant properties of its excretory/secretory antigens to control the formation of blood clots in its immediate intravascular habitat as a survival mechanism.
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Birkbeck R, Humm K, Cortellini S. A review of hyperfibrinolysis in cats and dogs. J Small Anim Pract 2019; 60:641-655. [PMID: 31608455 DOI: 10.1111/jsap.13068] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 08/21/2019] [Accepted: 08/21/2019] [Indexed: 12/14/2022]
Abstract
The fibrinolytic system is activated concurrently with coagulation; it regulates haemostasis and prevents thrombosis by restricting clot formation to the area of vascular injury and dismantling the clot as healing occurs. Dysregulation of the fibrinolytic system, which results in hyperfibrinolysis, may manifest as clinically important haemorrhage. Hyperfibrinolysis occurs in cats and dogs secondary to a variety of congenital and acquired disorders. Acquired disorders associated with hyperfibrinolysis, such as trauma, cavitary effusions, liver disease and Angiostrongylus vasorum infection, are commonly encountered in primary care practice. In addition, delayed haemorrhage reported in greyhounds following trauma and routine surgical procedures has been attributed to a hyperfibrinolytic disorder, although this has yet to be characterised. The diagnosis of hyperfibrinolysis is challenging and, until recently, has relied on techniques that are not readily available outside referral hospitals. With the recent development of point-of-care viscoelastic techniques, assessment of fibrinolysis is now possible in referral practice. This will provide the opportunity to target haemorrhage due to hyperfibrinolysis with antifibrinolytic drugs and thereby reduce associated morbidity and mortality. The fibrinolytic system and the conditions associated with increased fibrinolytic activity in cats and dogs are the focus of this review article. In addition, laboratory and point-of-care techniques for assessing hyperfibrinolysis and antifibrinolytic treatment for patients with haemorrhage are reviewed.
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Affiliation(s)
- R Birkbeck
- Department of Veterinary Clinical Sciences, The Royal Veterinary College, Hertfordshire, AL9 7TA, UK
| | - K Humm
- Department of Veterinary Clinical Sciences, The Royal Veterinary College, Hertfordshire, AL9 7TA, UK
| | - S Cortellini
- Department of Veterinary Clinical Sciences, The Royal Veterinary College, Hertfordshire, AL9 7TA, UK
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González-Miguel J, Valero MA, Reguera-Gomez M, Mas-Bargues C, Bargues MD, Simón F, Mas-Coma S. Numerous Fasciola plasminogen-binding proteins may underlie blood-brain barrier leakage and explain neurological disorder complexity and heterogeneity in the acute and chronic phases of human fascioliasis. Parasitology 2019; 146:284-298. [PMID: 30246668 PMCID: PMC6402360 DOI: 10.1017/s0031182018001464] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2018] [Revised: 07/26/2018] [Accepted: 07/27/2018] [Indexed: 12/17/2022]
Abstract
Human fascioliasis is a worldwide, pathogenic food-borne trematodiasis. Impressive clinical pictures comprising puzzling polymorphisms, manifestation multifocality, disease evolution changes, sequelae and mortality, have been reported in patients presenting with neurological, meningeal, neuropsychic and ocular disorders caused at distance by flukes infecting the liver. Proteomic and mass spectrometry analyses of the Fasciola hepatica excretome/secretome identified numerous, several new, plasminogen-binding proteins enhancing plasmin generation. This may underlie blood-brain barrier leakage whether by many simultaneously migrating, small-sized juvenile flukes in the acute phase, or by breakage of encapsulating formations triggered by single worm tracks in the chronic phase. Blood-brain barrier leakages may subsequently occur due to a fibrinolytic system-dependent mechanism involving plasmin-dependent generation of the proinflammatory peptide bradykinin and activation of bradykinin B2 receptors, after different plasminogen-binding protein agglomeration waves. Interactions between diverse parasitic situations and non-imbalancing fibrinolysis system alterations are for the first time proposed that explain the complexity, heterogeneity and timely variations of neurological disorders. Additionally, inflammation and dilation of blood vessels may be due to contact system-dependent generation bradykinin. This baseline allows for search of indicators to detect neurological risk in fascioliasis patients and experimental work on antifibrinolytic treatments or B2 receptor antagonists for preventing blood-brain barrier leakage.
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Affiliation(s)
- J. González-Miguel
- Laboratorio de Parasitología, Instituto de Recursos Naturales y Agrobiología de Salamanca (IRNASA-CSIC), Cordel de Merinas 40-52, 37008 Salamanca, Spain
| | - M. A. Valero
- Departamento de Parasitología, Facultad de Farmacia, Universidad de Valencia, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
| | - M. Reguera-Gomez
- Departamento de Parasitología, Facultad de Farmacia, Universidad de Valencia, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
| | - C. Mas-Bargues
- Departamento de Fisiología, Facultad de Medicina, Universidad de Valencia, Av. Blasco Ibáñez No. 15, 46010 Valencia, Spain
| | - M. D. Bargues
- Departamento de Parasitología, Facultad de Farmacia, Universidad de Valencia, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
| | - F. Simón
- Área de Parasitología, Facultad de Farmacia, Universidad de Salamanca, Av. Licenciado Méndez Nieto s/n, 37007 Salamanca, Spain
| | - S. Mas-Coma
- Departamento de Parasitología, Facultad de Farmacia, Universidad de Valencia, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
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Khanmohammadi M, Falak R, Meamar AR, Razmjou E, Mokhtarian K, Arshadi M, Shayanfar N, Akhlaghi L. Application of Dirofilaria immitis
immunoreactive proteins in serodiagnosis. Parasite Immunol 2018; 41:e12598. [DOI: 10.1111/pim.12598] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 08/07/2018] [Accepted: 10/10/2018] [Indexed: 11/26/2022]
Affiliation(s)
- Majid Khanmohammadi
- Department of Parasitology and Mycology; School of Medicine; Iran University of Medical Sciences; Tehran Iran
| | - Reza Falak
- Immunology Research Center; Iran University of Medical Sciences; Tehran Iran
- Department of Immunology; School of Medicine; Iran University of Medical Sciences; Tehran Iran
| | - Ahmad Reza Meamar
- Department of Parasitology and Mycology; School of Medicine; Iran University of Medical Sciences; Tehran Iran
| | - Elham Razmjou
- Department of Parasitology and Mycology; School of Medicine; Iran University of Medical Sciences; Tehran Iran
| | - Kobra Mokhtarian
- Medical Plant Research Center; Basic Health Sciences Institute; Shahrekord University of Medical Sciences; Shahrekord Iran
| | - Mehdi Arshadi
- Department of Parasitology and Mycology; School of Medicine; Iran University of Medical Sciences; Tehran Iran
| | - Nasrin Shayanfar
- Department of pathology; School of Medicine; Iran University of Medical Sciences; Tehran Iran
| | - Lame Akhlaghi
- Department of Parasitology and Mycology; School of Medicine; Iran University of Medical Sciences; Tehran Iran
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Characteristics of hyperfibrinolysis in dogs and cats demonstrated by rotational thromboelastometry (ROTEM). Vet J 2018; 242:67-73. [PMID: 30503547 DOI: 10.1016/j.tvjl.2018.11.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 10/31/2018] [Accepted: 11/01/2018] [Indexed: 01/27/2023]
Abstract
Hyperfibrinolysis (HFL) is a pathophysiological mechanism that has not been described in dogs or cats extensively. The aim of this study was to describe rotational thromboelastometry (ROTEM) parameters and underlying diagnosis in dogs and cats with HFL and evaluate association with bleeding diathesis. The ROTEM database was retrospectively searched for EXTEM (ROTEM activated with proprietary tissue factor) tracings with maximum lysis at 60min ≥15%. Concurrent ROTEM and plasma coagulation tests, thrombocyte number, diagnosis and survival to hospital discharge were extracted from medical records. Analysis of differences between dogs and cats and of factors associated with bleeding, fulminant HFL (clot breakdown within 30min) and survival to hospital discharge were performed. Hyperfibrinolysis was detected in eight cats presenting with haemoabdomen or haemothorax (n=4/8, 50%) and trauma (n=3/8, 38%) and in 36 dogs with angiostrongylosis (n=12, 33%), neoplasia (n=7, 19%), liver disease (n=4, 11%) and others including apparently healthy dogs (n=3, 8%). Hyperfibrinolysis was associated with prolonged EXTEM and APTEM (EXTEM with added apoprotein for inhibition of HFL) clotting time and decreased FIBTEM (EXTEM with added cytochalasin D for inhibition of thrombocytes) maximum clot firmness (MCF) in dogs and cats and with decreased EXTEM MCF in dogs. Bleeding dogs had significantly hypocoagulable EXTEM tracings. Fulminant HFL was associated with severe hypofibrinogenaemia in dogs (P=0.005) and was not associated with survival to hospital discharge. Evidence of HFL was demonstrated in dogs and cats with bleeding, trauma, parasitic and neoplastic disease. HFL is associated with late and weak clot formation.
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Plasminogen-binding proteins as an evasion mechanism of the host's innate immunity in infectious diseases. Biosci Rep 2018; 38:BSR20180705. [PMID: 30166455 PMCID: PMC6167496 DOI: 10.1042/bsr20180705] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 07/27/2018] [Accepted: 08/14/2018] [Indexed: 02/07/2023] Open
Abstract
Pathogens have developed particular strategies to infect and invade their hosts. Amongst these strategies’ figures the modulation of several components of the innate immune system participating in early host defenses, such as the coagulation and complement cascades, as well as the fibrinolytic system. The components of the coagulation cascade and the fibrinolytic system have been proposed to be interfered during host invasion and tissue migration of bacteria, fungi, protozoa, and more recently, helminths. One of the components that has been proposed to facilitate pathogen migration is plasminogen (Plg), a protein found in the host’s plasma, which is activated into plasmin (Plm), a serine protease that degrades fibrin networks and promotes degradation of extracellular matrix (ECM), aiding maintenance of homeostasis. However, pathogens possess Plg-binding proteins that can activate it, therefore taking advantage of the fibrin degradation to facilitate establishment in their hosts. Emergence of Plg-binding proteins appears to have occurred in diverse infectious agents along evolutionary history of host–pathogen relationships. The goal of the present review is to list, summarize, and analyze different examples of Plg-binding proteins used by infectious agents to invade and establish in their hosts. Emphasis was placed on mechanisms used by helminth parasites, particularly taeniid cestodes, where enolase has been identified as a major Plg-binding and activating protein. A new picture is starting to arise about how this glycolytic enzyme could acquire an entirely new role as modulator of the innate immune system in the context of the host–parasite relationship.
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Ayón-Núñez DA, Fragoso G, Espitia C, García-Varela M, Soberón X, Rosas G, Laclette JP, Bobes RJ. Identification and characterization of Taenia solium enolase as a plasminogen-binding protein. Acta Trop 2018; 182:69-79. [PMID: 29466706 DOI: 10.1016/j.actatropica.2018.02.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 02/13/2018] [Accepted: 02/15/2018] [Indexed: 12/19/2022]
Abstract
The larval stage of Taenia solium (cysticerci) is the causal agent of human and swine cysticercosis. When ingested by the host, T. solium eggs are activated and hatch in the intestine, releasing oncospheres that migrate to various tissues and evolve into cysticerci. Plasminogen (Plg) receptor proteins have been reported to play a role in migration processes for several pathogens. This work is aimed to identify Plg-binding proteins in T. solium cysticerci and determine whether T. solium recombinant enolase (rTsEnoA) is capable of specifically binding and activating human Plg. To identify Plg-binding proteins, a 2D-SDS-PAGE ligand blotting was performed, and recognized spots were identified by MS/MS. Seven proteins from T. solium cysticerci were found capable of binding Plg: fascicilin-1, fasciclin-2, enolase, MAPK, annexin, actin, and cytosolic malate dehydrogenase. To determine whether rTsEnoA binds human Plg, a ligand blotting was performed and the results were confirmed by ELISA both in the presence and absence of εACA, a competitive Plg inhibitor. Finally, rTsEnoA-bound Plg was activated to plasmin in the presence of tPA. To better understand the evolution of enolase isoforms in T. solium, a phylogenetic inference analysis including 75 enolase amino acid sequences was conducted. The origin of flatworm enolase isoforms, except for Eno4, is independent of their vertebrate counterparts. Therefore, herein we propose to designate tapeworm protein isoforms as A, B, C, and 4. In conclusion, recombinant enolase showed a strong plasminogen binding and activating activity in vitro. T. solium enolase could play a role in parasite invasion along with other plasminogen-binding proteins.
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Effect of heartworm disease and heartworm-associated respiratory disease (HARD) on the right ventricle of cats. Parasit Vectors 2017; 10:492. [PMID: 29143659 PMCID: PMC5688429 DOI: 10.1186/s13071-017-2451-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Background Dirofilaria immitis infection occurs in dogs and cats, both of which species are clinically affected by mature adult infections. Cats are uniquely affected by immature-adult infections with an inflammatory pulmonary disease called Heartworm-Associated Respiratory Disease (HARD). D. immitis infection causes pulmonary parenchymal and vascular pathology in the dog and cat. Dogs develop pulmonary hypertension and cor pulmonale, whereas the development of pulmonary hypertension is rare in the cat. D. immitis infection in the dog causes alteration of the right ventricular (RV) extracellular matrix, including a decrease in myocardial collagen. In this study, the RV myocardial changes of cats infected with adult and immature-adult D. immitis were assessed. Methods The cardiopulmonary systems of six groups of SPF cats (n = 9-10 per group) were examined 8 or 18 months after infection with L3 D. immitis. Two groups were untreated and allowed to develop adult HW; two groups were treated with ivermectin starting 3 months post infection, thus allowing HARD but no mature adult heartworms; and two groups were treated with selamectin beginning 1 month post infection, preventing development of L5 or adult heartworms. A group of specific pathogen free (SPF) normal cats was utilized as a negative control (n = 12). Lung pathologic lesions were objectively assessed, and both RV and left ventricular (LV) weights were obtained to calculate an RV/LV ratio. Intramural RV myocardial collagen content was quantitatively assessed. Results RV/LV weight ratios were not different between groups. Negative control cats had significantly greater RV collagen content than all other affected groups (P = 0.032). Analysis of the RV/LV ratios and collagen content revealed no significant relationship (r = 0.03, P = 0.723, respectively). Collagen content had a modest, but significant, negative correlation, however, with both pulmonary vascular pathology (r = −0.25, P = 0.032) as well as the total pulmonary parenchymal and vascular pathology (r = −0.26, P = 0.025). Conclusions Cats infected with mature and immature D. immitis did not develop RV hypertrophy but did demonstrate loss of RV myocardial collagen content. The collagen loss was present at 8 and 18 months after infection in all infected cats. This loss of RV myocardial collagen was correlated with the severity of pulmonary parenchymal and vascular pathology.
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She D, Zhang X, Mo Z, Yang G, Shin JW, Chen X, Cui L, Li H. Proteomic Analysis of Differentially Expressed Proteins in Intracranial Angiostrongylus cantonensis Larvae in Permissive and Non-Permissive Hosts. J Parasitol 2017; 103:718-726. [PMID: 28953426 DOI: 10.1645/15-933] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Angiostrongylus cantonensis infection can lead to severe neuropathological damage caused by the development of these nematodes in the central nervous system after penetrating the blood-brain barrier. They commonly cause eosinophilic meningitis or meningoencephalitis in non-permissive hosts (e.g., mice). It has been shown that differences exist in the brains of permissive and non-permissive hosts during the larval development of A. cantonensis; however, the mechanism underlying the difference is not completely understood. This study analyzed and characterized the differentially expressed proteins in the intracranial A. cantonensis larvae in rat (ILR) and mouse (ILM) brains by using proteomics. We found that 29 proteins were differentially expressed: 12 of these proteins were highly expressed in ILR, whereas the remaining 17 proteins were highly expressed in ILM. Three protein spots were homologous to the actin-2, actin-1, and disorganized muscle protein 1 (dim-1) of Caenorhabditis elegans. In addition, proteomic analyses revealed that act-1 and act-2 were up-regulated in ILM compared to ILR, whereas dim-1 was down-regulated in ILM. Annotation using gene ontology revealed that act-1, act-2, and dim-1 were mainly associated with adenosine triphosphate (ATP) catabolic processes and ATP binding. Quantitative real-time polymerase chain reaction analyses of act-1 and dim-1 using the first internal transcribed spacers of A. cantonensis 18S ribosomal RNA (rRNA) was consistent with 2-dimensional gel electrophoresis (2-DE) and the sizes of these parasites; ILR was longer and wider than ILM. These results indicate that the differentially expressed proteins dim-1 and act-1 could be related to the development and pathogenicity of A. cantonensis in different hosts.
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Affiliation(s)
- Dan She
- Department of Pathogen Biology and Experimental Teaching Centre of Preventive Medicine, Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Higher Institutes, Key Laboratory for Tropical Disease Research of Guangdong Province, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Xin Zhang
- Department of Pathogen Biology and Experimental Teaching Centre of Preventive Medicine, Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Higher Institutes, Key Laboratory for Tropical Disease Research of Guangdong Province, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Zexun Mo
- Department of Pathogen Biology and Experimental Teaching Centre of Preventive Medicine, Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Higher Institutes, Key Laboratory for Tropical Disease Research of Guangdong Province, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Guilan Yang
- Department of Pathogen Biology and Experimental Teaching Centre of Preventive Medicine, Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Higher Institutes, Key Laboratory for Tropical Disease Research of Guangdong Province, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Jyh-Wei Shin
- Department of Pathogen Biology and Experimental Teaching Centre of Preventive Medicine, Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Higher Institutes, Key Laboratory for Tropical Disease Research of Guangdong Province, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Xiaoguang Chen
- Department of Pathogen Biology and Experimental Teaching Centre of Preventive Medicine, Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Higher Institutes, Key Laboratory for Tropical Disease Research of Guangdong Province, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Liwang Cui
- Department of Pathogen Biology and Experimental Teaching Centre of Preventive Medicine, Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Higher Institutes, Key Laboratory for Tropical Disease Research of Guangdong Province, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Hua Li
- Department of Pathogen Biology and Experimental Teaching Centre of Preventive Medicine, Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Higher Institutes, Key Laboratory for Tropical Disease Research of Guangdong Province, School of Public Health, Southern Medical University, Guangzhou, 510515, China
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Umair S, Bouchet CLG, Knight JS, Pernthaner A, Simpson HV. Molecular and biochemical characterisation and recognition by the immune host of the glyceraldehyde 3-phosphate dehydrogenase (GAPDH) of the abomasal nematode parasite Teladorsagia circumcincta. Exp Parasitol 2017; 181:40-46. [PMID: 28757123 DOI: 10.1016/j.exppara.2017.07.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 07/18/2017] [Accepted: 07/26/2017] [Indexed: 10/19/2022]
Abstract
A 1023 bp full length cDNA encoding Teladorsagia circumcincta GAPDH (TeciGAPDH) was cloned, expressed in Escherichia coli and the recombinant protein purified and its kinetic properties determined. A phylogenetic tree was constructed using helminth GAPDH sequences. The predicted protein consisted of 341 amino acids and was present as a single band of about 38 kDa on SDS-PAGE. Multiple alignments of the protein sequence of TeciGAPDH with homologues from other helminths showed that the greatest similarity (93%) to the GAPDH of Haemonchus contortus and Dictyocaulus viviparus, 82-86% similarity to the other nematode sequences and 68-71% similarity to cestode and trematode enzymes. Substrate binding sites and conserved regions were identified and were completely conserved in other homologues. At 25 °C, the optimum pH for TeciGAPDH activity was pH 8, the Vmax was 1052 ± 23 nmol min-1 mg-1 protein and the apparent Km for the substrate glyceraldehyde-3-phosphate was 0.02 ± 0.01 mM (both mean ± SD, n = 2). Antibodies in both serum and saliva from field-immune, but not nematode-naïve, sheep recognised recombinant TeciGAPDH in enzyme-linked immunosorbent assays. The recognition of the recombinant protein by antibodies generated by exposure of sheep to native GAPDH indicates similar antigenicity of the two proteins.
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Affiliation(s)
- S Umair
- AgResearch Ltd, Private Bag 11-008, Palmerston North, New Zealand.
| | - C L G Bouchet
- AgResearch Ltd, Private Bag 11-008, Palmerston North, New Zealand
| | - J S Knight
- AgResearch Ltd, Private Bag 11-008, Palmerston North, New Zealand
| | - A Pernthaner
- AgResearch Ltd, Private Bag 11-008, Palmerston North, New Zealand
| | - H V Simpson
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11-222, Palmerston North, New Zealand
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Sigrist NE, Hofer-Inteeworn N, Jud Schefer R, Kuemmerle-Fraune C, Schnyder M, Kutter APN. Hyperfibrinolysis and Hypofibrinogenemia Diagnosed With Rotational Thromboelastometry in Dogs Naturally Infected With Angiostrongylus vasorum. J Vet Intern Med 2017; 31:1091-1099. [PMID: 28480552 PMCID: PMC5508311 DOI: 10.1111/jvim.14723] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 03/10/2017] [Accepted: 03/29/2017] [Indexed: 01/12/2023] Open
Abstract
Background The pathomechanism of Angiostrongylus vasorum infection‐associated bleeding diathesis in dogs is not fully understood. Objective To describe rotational thromboelastometry (ROTEM) parameters in dogs naturally infected with A. vasorum and to compare ROTEM parameters between infected dogs with and without clinical signs of bleeding. Animals A total of 21 dogs presented between 2013 and 2016. Methods Dogs with A. vasorum infection and ROTEM evaluation were retrospectively identified. Thrombocyte counts, ROTEM parameters, clinical signs of bleeding, therapy, and survival to discharge were retrospectively retrieved from patient records and compared between dogs with and without clinical signs of bleeding. Results Evaluation by ROTEM showed hyperfibrinolysis in 8 of 12 (67%; 95% CI, 40–86%) dogs with and 1 of 9 (11%; 95% CI, 2–44%) dogs without clinical signs of bleeding (P = .016). Hyperfibrinolysis was associated with severe hypofibrinogenemia in 6 of 10 (60%; 95% CI, 31–83%) of the cases. Hyperfibrinolysis decreased or resolved after treatment with 10–80 mg/kg tranexamic acid. Fresh frozen plasma (range, 14–60 mL/kg) normalized follow‐up fibrinogen function ROTEM (FIBTEM) maximal clot firmness in 6 of 8 dogs (75%; 95% CI, 41–93%). Survival to discharge was 67% (14/21 dogs; 95% CI, 46–83%) and was not different between dogs with and without clinical signs of bleeding (P = .379). Conclusion and Clinical Importance Hyperfibrinolysis and hypofibrinogenemia were identified as an important pathomechanism in angiostrongylosis‐associated bleeding in dogs. Hyperfibrinolysis and hypofibrinogenemia were normalized by treatment with tranexamic acid and plasma transfusions, respectively.
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Affiliation(s)
- N E Sigrist
- Department for Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - N Hofer-Inteeworn
- Department for Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - R Jud Schefer
- Department for Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - C Kuemmerle-Fraune
- Department for Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - M Schnyder
- Institute of Parasitology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - A P N Kutter
- Section of Anaesthesiology, Equine Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
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Serrano-Parreño B, Carretón E, Caro-Vadillo A, Falcón-Cordón S, Falcón-Cordón Y, Montoya-Alonso JA. Pulmonary hypertension in dogs with heartworm before and after the adulticide protocol recommended by the American Heartworm Society. Vet Parasitol 2017; 236:34-37. [PMID: 28288761 DOI: 10.1016/j.vetpar.2017.02.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 01/13/2017] [Accepted: 02/01/2017] [Indexed: 11/19/2022]
Abstract
Pulmonary hypertension (pH) is a frequent and severe phenomenon in heartworm disease (Dirofilaria immitis). There is a lack of studies assessing the evolution of the proliferative endarteritis and pH caused by D. immitis after the death of the parasites, so this study evaluated the influence that the elimination of the worms exerts over the pulmonary pressure and therefore evolution of the endarteritis, through the evaluation of the Right Pulmonary Artery Distensibility (RPAD) Index and other echocardiographic measurements in 2D mode, M-mode and Doppler echocardiography in 34 dogs naturally infected by D. immitis on day 0, and one month after the last adulticide dose (day 120). pH, based on the determination of the RPAD Index, was present in 68% of the dogs (n=23) on day 0 and on day 120. No significant differences were observed between the RPAD Index between the two measurements, and only significant differences were found in pulmonary deceleration time, ejection time, and left ventricular internal diameter in telediastole when measurements from day 0 and day 120 were compared. There was not any worsening in the development of pH after the elimination of the parasites, independently of the parasite burden. During the adulticide treatment, the death of the worms causes thromboembolism and tends to worsen the vascular damage and presence of pH . It seems that following the adulticide protocol recommended by the American Heartworm Society with the previous elimination of Wolbachia and reduction of microfilariae followed by the stepped death of the worms did not cause a significant aggravation of the pulmonary damage of the treated dogs. Neither is present any significant improvement in the RPAD Index on day 120; probably, more time is needed before appreciating some positive changes after the elimination of the worms and Wolbachia from the vasculature and further studies are necessary.
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Affiliation(s)
- B Serrano-Parreño
- Internal Medicine, Faculty of Veterinary Medicine, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
| | - E Carretón
- Internal Medicine, Faculty of Veterinary Medicine, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain.
| | - A Caro-Vadillo
- Department of Animal Medicine and Surgery, Veterinary Faculty, Complutense University of Madrid, Madrid, Spain
| | - S Falcón-Cordón
- Internal Medicine, Faculty of Veterinary Medicine, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
| | - Y Falcón-Cordón
- Internal Medicine, Faculty of Veterinary Medicine, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
| | - J A Montoya-Alonso
- Internal Medicine, Faculty of Veterinary Medicine, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
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Tritten L, Clarke D, Timmins S, McTier T, Geary TG. Dirofilaria immitis exhibits sex- and stage-specific differences in excretory/secretory miRNA and protein profiles. Vet Parasitol 2016; 232:1-7. [DOI: 10.1016/j.vetpar.2016.11.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 09/28/2016] [Accepted: 11/07/2016] [Indexed: 10/20/2022]
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26
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González-Miguel J, Larrazabal C, Loa-Mesón D, Siles-Lucas M, Simón F, Morchón R. Glyceraldehyde 3-phosphate dehydrogenase and galectin from Dirofilaria immitis participate in heartworm disease endarteritis via plasminogen/plasmin system. Vet Parasitol 2016; 223:96-101. [PMID: 27198784 DOI: 10.1016/j.vetpar.2016.04.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 04/13/2016] [Accepted: 04/17/2016] [Indexed: 01/18/2023]
Abstract
The interaction between parasitic protozoa and helminths, both in the blood and in tissues and the fibrinolytic system of their hosts is usually considered as a survival parasite mechanism since this system is the physiological route responsible for degrading fibrin clots. The broad-range proteolytic activity of plasmin, the final enzyme of the route, implies that its recruitment by these parasites is an important mechanism that mediates their invasion and establishment in the hosts. However, recent studies have proposed a dual role for plasmin by linking its over-production with pathological mechanisms at vascular level. Most of these studies have been conducted in Dirofilaria immitis, a blood-borne parasite that survives in the pulmonary arteries of its host for years while it produces a chronic inflammatory disease, whose main pathogenic mechanism is the appearance of proliferative endarteritis. Recently, the participation of two proteins from D. immitis, glyceraldehyde 3-phosphate dehydrogenase (DiGAPDH) and galectin (DiGAL), in the activation of the fibrinolytic system of its host has been demonstrated, which has been a priori associated with parasite survival mechanisms. The aim of the present paper was to study the role of plasmin generated by these proteins in the emergence of proliferative endarteritis. An in vitro model of canine endothelial and smooth muscle cells, as well as the two parasitic recombinant proteins were employed. The results show that DiGAPDH and DiGAL stimulate the proliferation and migration of both cell types, as well as the degradation of the extracellular matrix (ECM) via plasminogen (PLG)/plasmin system, being all of these mechanisms related to the appearance of proliferative endarteritis. Due to the high degree of evolutionary conservation of these antigens, these data support the hypothesis of the survival/pathology ambivalence in the interactions between parasites and the fibrinolytic system of their hosts and represent an advance in the knowledge of the mechanisms involved in the emergence of proliferative endarteritis in the cardiopulmonary dirofilariosis (heartworm disease).
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Affiliation(s)
- Javier González-Miguel
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, Salamanca, Spain.
| | - Carmen Larrazabal
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, Salamanca, Spain
| | - Diana Loa-Mesón
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, Salamanca, Spain
| | | | - Fernando Simón
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, Salamanca, Spain
| | - Rodrigo Morchón
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, Salamanca, Spain
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27
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González-Miguel J, Siles-Lucas M, Kartashev V, Morchón R, Simón F. Plasmin in Parasitic Chronic Infections: Friend or Foe? Trends Parasitol 2016; 32:325-335. [PMID: 26775037 DOI: 10.1016/j.pt.2015.12.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 12/04/2015] [Accepted: 12/16/2015] [Indexed: 12/24/2022]
Abstract
Plasmin is the final product of the fibrinolytic system, the physiological mechanism responsible for dissolving fibrin clots. Its broad-range proteolytic activity implies that interaction with fibrinolysis and recruitment of plasmin by blood and tissue parasites is an important mechanism that mediates the invasion and establishment of this kind of pathogen in the hosts. However, recent studies have linked an excess of plasmin generated by this interaction with serious pathological events at the vascular level, including the proliferation and migration of arterial wall cells, inflammation, and degradation of the extracellular matrix. Therefore, we present data that support the need to reconsider the role of plasmin, as well as its benefits or drawbacks, in the context of host-parasite relations.
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Affiliation(s)
- Javier González-Miguel
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, 37007, Salamanca, Spain.
| | | | - Vladimir Kartashev
- Department of Infectious Diseases, Rostov State Medical University, Rostov-na-Donu, Russia
| | - Rodrigo Morchón
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, 37007, Salamanca, Spain
| | - Fernando Simón
- Laboratory of Parasitology, Faculty of Pharmacy, University of Salamanca, 37007, Salamanca, Spain
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28
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Gomez S, Adalid-Peralta L, Palafox-Fonseca H, Cantu-Robles VA, Soberón X, Sciutto E, Fragoso G, Bobes RJ, Laclette JP, Yauner LDP, Ochoa-Leyva A. Genome analysis of Excretory/Secretory proteins in Taenia solium reveals their Abundance of Antigenic Regions (AAR). Sci Rep 2015; 5:9683. [PMID: 25989346 PMCID: PMC4437048 DOI: 10.1038/srep09683] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 03/16/2015] [Indexed: 11/09/2022] Open
Abstract
Excretory/Secretory (ES) proteins play an important role in the host-parasite interactions. Experimental identification of ES proteins is time-consuming and expensive. Alternative bioinformatics approaches are cost-effective and can be used to prioritize the experimental analysis of therapeutic targets for parasitic diseases. Here we predicted and functionally annotated the ES proteins in T. solium genome using an integration of bioinformatics tools. Additionally, we developed a novel measurement to evaluate the potential antigenicity of T. solium secretome using sequence length and number of antigenic regions of ES proteins. This measurement was formalized as the Abundance of Antigenic Regions (AAR) value. AAR value for secretome showed a similar value to that obtained for a set of experimentally determined antigenic proteins and was different to the calculated value for the non-ES proteins of T. solium genome. Furthermore, we calculated the AAR values for known helminth secretomes and they were similar to that obtained for T. solium. The results reveal the utility of AAR value as a novel genomic measurement to evaluate the potential antigenicity of secretomes. This comprehensive analysis of T. solium secretome provides functional information for future experimental studies, including the identification of novel ES proteins of therapeutic, diagnosis and immunological interest.
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Affiliation(s)
- Sandra Gomez
- Instituto Nacional de Neurología y Neurocirugía, México, D.F., C.P. 14269, México
| | - Laura Adalid-Peralta
- 1] Instituto Nacional de Neurología y Neurocirugía, México, D.F., C.P. 14269, México [2] Unidad Periférica del Instituto de Investigaciones Biomédicas en el Instituto Nacional de Neurología y Neurocirugía, México, D.F., C.P. 14269, México
| | | | - Vito Adrian Cantu-Robles
- Instituto Nacional de Medicina Genómica, Periférico Sur No. 4809, Col. Arenal Tepepan, Delegación Tlalpan, México, D.F. C.P. 14610, México
| | - Xavier Soberón
- 1] Instituto Nacional de Medicina Genómica, Periférico Sur No. 4809, Col. Arenal Tepepan, Delegación Tlalpan, México, D.F. C.P. 14610, México [2] Instituto de Biotecnología, Universidad Nacional Autónoma de México, Avenida Universidad 2001, Cuernavaca, Morelos, C.P. 62210, México
| | - Edda Sciutto
- Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México, D.F., C.P. 04510, México
| | - Gladis Fragoso
- Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México, D.F., C.P. 04510, México
| | - Raúl J Bobes
- Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México, D.F., C.P. 04510, México
| | - Juan P Laclette
- Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México, D.F., C.P. 04510, México
| | - Luis del Pozo Yauner
- Instituto Nacional de Medicina Genómica, Periférico Sur No. 4809, Col. Arenal Tepepan, Delegación Tlalpan, México, D.F. C.P. 14610, México
| | - Adrián Ochoa-Leyva
- Unidad de Genómica de Poblaciones Aplicada a la Salud, Facultad de Química, UNAM-Instituto Nacional de Medicina Genómica (INMEGEN), Periférico Sur No. 4809, Col. Arenal Tepepan, Delegación Tlalpan México, D.F. C.P. 14610, México
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29
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González-Miguel J, Morchón R, Siles-Lucas M, Oleaga A, Simón F. Surface-displayed glyceraldehyde 3-phosphate dehydrogenase and galectin from Dirofilaria immitis enhance the activation of the fibrinolytic system of the host. Acta Trop 2015; 145:8-16. [PMID: 25666684 DOI: 10.1016/j.actatropica.2015.01.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 01/29/2015] [Accepted: 01/30/2015] [Indexed: 01/17/2023]
Abstract
Cardiopulmonary dirofilariosis is a cosmopolitan disease caused by Dirofilaria immitis, a filaroid parasite whose adult worms live for years in the vascular system of its host. Previous studies have shown that D. immitis can use their excretory/secretory (ES) and surface antigens to enhance fibrinolysis, which could limit the formation of clots in its surrounding environment. Moreover, several isoforms of the glyceraldehyde 3-phosphate dehydrogenase (GAPDH) and galectin (GAL) were identified in both antigenic extracts as plasminogen-binding proteins. The aim of this work is to study the interaction of the GAPDH and GAL of D. immitis with the fibrinolytic system of the host. This study includes the cloning, sequencing and expression of the recombinant forms of the GAPDH and GAL of D. immitis (rDiGAPDH and rDiGAL) and the analysis of their capacity as plasminogen-binding proteins. The results indicate that rDiGAPDH and rDiGAL are able to bind plasminogen and stimulate plasmin generation by tissue plasminogen activator (tPA). This interaction needs the involvement of lysine residues, many of which are located externally in both proteins as have been shown by the molecular modeling of their secondary structures. In addition, we show that rDiGAPDH and rDiGAL enhance the expression of the urokinase-type plasminogen activator (uPA) on canine endothelial cells in culture and that both proteins are expressed on the surface of D. immitis in close contact with the blood of the host. These data suggest that D. immitis could use the associated surface GAPDH and GAL as physiological plasminogen receptors to shift the fibrinolytic balance towards the generation of plasmin, which might constitute a survival mechanism to avoid the clot formation in its intravascular habitat.
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Affiliation(s)
- Javier González-Miguel
- Faculty of Pharmacy, Laboratory of Parasitology, Institute of Biomedical Research of Salamanca (IBSAL), University of Salamanca, 37007 Salamanca, Spain.
| | - Rodrigo Morchón
- Faculty of Pharmacy, Laboratory of Parasitology, Institute of Biomedical Research of Salamanca (IBSAL), University of Salamanca, 37007 Salamanca, Spain
| | | | - Ana Oleaga
- Laboratory of Parasitology, IRNASA, CSIC, Salamanca, Spain
| | - Fernando Simón
- Faculty of Pharmacy, Laboratory of Parasitology, Institute of Biomedical Research of Salamanca (IBSAL), University of Salamanca, 37007 Salamanca, Spain
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30
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González-Miguel J, Morchón R, Siles-Lucas M, Simón F. Fibrinolysis and proliferative endarteritis: two related processes in chronic infections? The model of the blood-borne pathogen Dirofilaria immitis. PLoS One 2015; 10:e0124445. [PMID: 25875022 PMCID: PMC4395379 DOI: 10.1371/journal.pone.0124445] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Accepted: 03/14/2015] [Indexed: 12/24/2022] Open
Abstract
The interaction between blood-borne pathogens and fibrinolysis is one of the most important mechanisms that mediate invasion and the establishment of infectious agents in their hosts. However, overproduction of plasmin (final product of the route) has been related in other contexts to proliferation and migration of the arterial wall cells and degradation of the extracellular matrix. We have recently identified fibrinolysis-activating antigens from Dirofilaria immitis, a blood-borne parasite whose key pathological event (proliferative endarteritis) is produced by similar mechanisms to those indicated above. The objective of this work is to study how two of this antigens [actin (ACT) and fructose-bisphosphate aldolase (FBAL)] highly conserved in pathogens, activate fibrinolysis and to establish a relationship between this activation and the development of proliferative endarteritis during cardiopulmonary dirofilariasis. We demonstrate that both proteins bind plasminogen, enhance plasmin generation, stimulate the expression of the fibrinolytic activators tPA and uPA in endothelial cell cultures and are located on the surface of the worm in contact with the host’s blood. ELISA, western blot and immunofluorescence techniques were employed for this purpose. Additionally, the implication of lysine residues in this interaction was analyzed by bioinformatics. The involvement of plasmin generated by the ACT/FBAL and plasminogen binding in cell proliferation and migration, and degradation of the extracellular matrix were shown in an “in vitro” model of endothelial and smooth muscle cells in culture. The obtained results indicate that ACT and FBAL from D. immitis activate fibrinolysis, which could be used by the parasite like a survival mechanism to avoid the clot formation. However, long-term overproduction of plasmin can trigger pathological events similar to those described in the emergence of proliferative endarteritis. Due to the high degree of evolutionary conservation of these antigens, similar processes may occur in other blood-borne pathogens.
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Affiliation(s)
- Javier González-Miguel
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, Salamanca, Spain
- * E-mail:
| | - Rodrigo Morchón
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, Salamanca, Spain
| | | | - Fernando Simón
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, Salamanca, Spain
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González-Miguel J, Morchón R, Carretón E, Montoya-Alonso JA, Simón F. Can the activation of plasminogen/plasmin system of the host by metabolic products of Dirofilaria immitis participate in heartworm disease endarteritis? Parasit Vectors 2015; 8:194. [PMID: 25888952 PMCID: PMC4391138 DOI: 10.1186/s13071-015-0799-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 03/13/2015] [Indexed: 12/20/2022] Open
Abstract
Background Proliferative endarteritis is one of the key pathological mechanisms of cardiopulmonary dirofilariosis, a cosmopolitan parasitosis caused by Dirofilaria immitis affecting dogs and cats around the world. It has been shown that the excretory/secretory antigens from D. immitis adult worms (DiES) bind plasminogen (PLG) and activate fibrinolysis, which can lead to a survival mechanism for the parasite in its intravascular environment. However, overproduction of plasmin (final product of the route) has been related to pathological processes similar to those described in proliferative endarteritis. The aim of this study is to relate the appearance of this pathological condition with the activation of the PLG/plasmin system of the host by DiES. Methods Cell proliferation through the crystal violet technique, cell migration by wound healing assay and degradation of the extracellular matrix by measuring collagen degradation and levels of matrix metalloproteinases were studied in an “in vitro” model using canine vascular endothelial and smooth muscle cells. These cells were treated with a mixture of DiES + PLG. Untreated cells, cells only stimulated with DiES or with PLG, or with a mixture of DiES + PLG + εACA (an inhibitor of the PLG-plasmin conversion) were employed as controls. In addition, the effect of DiES on the expression of the fibrinolytic activators tPA and uPA, the inhibitor PAI-1 and the PLG receptor Annexin A2 was analyzed in both types of cultures by western blot. Results Plasmin generated by DiES + PLG binding produced a significant increase in the cell proliferation and migration of the endothelial and smooth muscle cells, as well as an increase in the destruction of the extracellular matrix based on a further degradation of Type I Collagen and an increased level of matrix metalloproteinase-2. DiES also induce an increase in the expression of tPA and uPA in endothelial cells in culture, as well as a decrease in the expression of PAI-1 in both types of cells. Conclusions Our study reports an interrelationship between plasmin caused by fibrinolysis activation by metabolic products of D. immitis and the appearance of pathological events similar to those described in the emergence of proliferative endarteritis in the cardiopulmonary dirofilariosis.
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Affiliation(s)
- Javier González-Miguel
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, 37007, Salamanca, Spain.
| | - Rodrigo Morchón
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, 37007, Salamanca, Spain.
| | - Elena Carretón
- Internal Medicine, Faculty of Veterinary Medicine, University of Las Palmas de Gran Canaria, 35413, Arucas, Las Palmas, Spain.
| | - José Alberto Montoya-Alonso
- Internal Medicine, Faculty of Veterinary Medicine, University of Las Palmas de Gran Canaria, 35413, Arucas, Las Palmas, Spain.
| | - Fernando Simón
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, 37007, Salamanca, Spain.
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32
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Proteomic analysis of the urine of Dirofilaria immitis infected dogs. Vet Parasitol 2014; 203:241-6. [DOI: 10.1016/j.vetpar.2014.01.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 01/21/2014] [Accepted: 01/24/2014] [Indexed: 11/20/2022]
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González-Miguel J, Morchón R, Gussoni S, Bossetti E, Hormaeche M, Kramer LH, Simón F. Immunoproteomic approach for identification of Ascaris suum proteins recognized by pigs with porcine ascariasis. Vet Parasitol 2014; 203:343-8. [PMID: 24813788 DOI: 10.1016/j.vetpar.2014.03.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Revised: 03/05/2014] [Accepted: 03/26/2014] [Indexed: 01/16/2023]
Abstract
Ascaris suum, the causative agent of porcine ascariasis, is responsible for marked economic losses in pig farms worldwide. Despite recent advances in research, including the characterization of the genome of A. suum, knowledge about the parasite/host relationship in porcine ascariasis at the molecular level is scarce and chemotherapy is the only effective option for parasite control. The aim of this study was to identify immunogenic proteins of A. suum somatic antigens associated with the pathogenicity/survival mechanisms of the parasite, by using two-dimensional (2-D) electrophoresis, 2-D Western blot and mass spectrometry (MS). A total of 24 parasite proteins recognized by serum samples from pigs naturally infected with A. suum were identified. Most of them (23/24) were identified as being involved in parasite survival mechanisms, including functions related to energy generation (12 proteins) and redox processes (5 proteins). These results may aid the search for effective chemo-therapeutic targets in porcine ascariasis. Further studies are needed, however, to illustrate the effect of the host immune response on the survival mechanisms of A. suum.
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Affiliation(s)
- Javier González-Miguel
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, 37007 Salamanca, Spain.
| | - Rodrigo Morchón
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, 37007 Salamanca, Spain
| | | | - Erika Bossetti
- University of Milan, Leonardo da Vinci Program, Milan, Italy
| | - Marta Hormaeche
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, 37007 Salamanca, Spain
| | - Laura Helen Kramer
- Dipartimento di Produzioni Animali, Università degli Studi di Parma, 43100 Parma, Italy
| | - Fernando Simón
- Laboratory of Parasitology, Faculty of Pharmacy, Institute of Biomedical Research of Salamanca (IBSAL) and University of Salamanca, 37007 Salamanca, Spain
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Proteomic analysis of the somatic and surface compartments from Dirofilaria immitis adult worms. Vet Parasitol 2014; 203:144-52. [PMID: 24602330 DOI: 10.1016/j.vetpar.2014.02.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 01/29/2014] [Accepted: 02/04/2014] [Indexed: 01/08/2023]
Abstract
Dirofilaria immitis (hearthworm) is a filarial roundworm transmitted by mosquitoes to different vertebrate hosts (dogs, cats and humans, among others), causing dirofilariosis. The adult worms reside in the pulmonary arteries affecting vessels and tissues and resulting in different pathological manifestations. Worms migrate to the heart and surrounding major vessels in heavy infections. Dirofilariosis can result in serious damage to affected hosts. In the last few years, a re-emergence of the disease driven by the climate change has been pointed out. Very recently, the knowledge at molecular level of this parasite has been extended by the published studies on its genome and transcriptome. Nevertheless, studies on the expression of defined protein sets in different parasite compartments and the corresponding role of those proteins in the host-parasite relationship have been relatively scarce to date. These include the description of the adult worm secretome, and some of the proteins eliciting humoural immune responses and those related with plasminogen binding in secreted and surface extracts of the parasite. Here, we investigate by proteomics the somatic and surface compartments of the D. immitis adult worm, adding new information on protein expression and localization that would facilitate a deeper understanding of the host-parasite relationships in dirofilariosis.
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Figuera L, Gómez-Arreaza A, Avilán L. Parasitism in optima forma: exploiting the host fibrinolytic system for invasion. Acta Trop 2013; 128:116-23. [PMID: 23850506 DOI: 10.1016/j.actatropica.2013.06.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2013] [Revised: 06/20/2013] [Accepted: 06/30/2013] [Indexed: 02/08/2023]
Abstract
The interaction of pathogenic bacteria with the host fibrinolytic system through the plasminogen molecule has been well documented. It has been shown, using animal models, to be important in invasion into the host and establishment of the infection. From a number of recent observations with parasitic protists and helminths, emerges evidence that also in these organisms the interaction with plasminogen may be important for infection and virulence. A group of molecules that act as plasminogen receptors have been identified in parasites. This group comprises the glycolytic enzymes enolase, glyceraldehyde-3-phosphate dehydrogenase and fructose-1,6-biphosphate aldolase, in common with the plasminogen receptors known in prokaryotic pathogens. The interaction with the fibrinolytic system may arm the parasites with the host protease plasmin, thus helping them to migrate and cross barriers, infect cells and avoid clot formation. In this context, plasminogen receptors on the parasite surface or as secreted molecules, may be considered virulence factors. A possible evolutionary scenario for the recruitment of glycolytic enzymes as plasminogen receptors by widely different pathogens is discussed.
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36
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Proteomic analysis of Ascaridia galli. Identification of immunoreactive proteins in naturally and experimentally infected hens. Vet Parasitol 2013; 196:388-96. [PMID: 23578998 DOI: 10.1016/j.vetpar.2013.03.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 03/07/2013] [Accepted: 03/13/2013] [Indexed: 02/04/2023]
Abstract
Ascaridia galli, intestinal parasite of domestic fowl, is responsible of economic losses in avian exploitations. However, molecular mechanisms that govern avian ascaridiasis remain largely unknown. The aim of the present work was to identify proteins of A. galli recognized by the immune system of naturally and experimentally infected hens, using two-dimensional electrophoresis (2-DE) and mass spectrometry (MS). Sixteen immunoreactive proteins of A. galli were identified. These proteins are mainly related to different metabolic processes, cell motility and binding activities. The timing evolution of this recognition pattern was studied using serum samples from experimentally infected hens, allowing us to observe an early recognition of many of these antigens. Many of them were isoforms from lipid and plasminogen-binding proteins. Moreover, plasminogen-binding activity has been related in other parasites with the facilitation of intra-organic migration, which represents an important fact in avian ascaridiasis. This work represents the first proteomic study of A. galli and could contribute to explain some aspects of parasite/host relationships of avian ascaridiasis.
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Surface associated antigens of Dirofilaria immitis adult worms activate the host fibrinolytic system. Vet Parasitol 2013; 196:235-40. [PMID: 23433649 DOI: 10.1016/j.vetpar.2013.01.028] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 01/21/2013] [Accepted: 01/28/2013] [Indexed: 02/02/2023]
Abstract
Cardiopulmonary dirofilariosis (Dirofilaria immitis) is characterized by apparent contradictory events, like the long-term survival of adult worms in the circulatory system of the infected hosts and the development of life-threatening events like thromboembolisms and others. Thus parasite mechanisms, like the activation of fibrinolytic system, are key to the survival of both the worms and the host. The aim of this study was to investigate the interaction between D. immitis adult worms surface-associated antigens (DiSAA) and the fibrinolytic system of the host. We demonstrate that DiSAA extract is able to bind plasminogen and generate plasmin, with the latter occurring in a tissue plasminogen activator (t-PA) dependent manner. Additionally, 11 plasminogen-binding proteins from DiSAA extract were identified by proteomics and mass spectrometry (MS) (actin-5C, actin-1, enolase, fructose-bisphosphate aldolase, GAPDH, MSP domain protein, MSP 2, beta-galactosidase-binding-lectin, galectin, immunoglobulin I-set domain-containing protein and cyclophilin Ovcyp-2). Because in a previous work we have shown the positive interaction between the excretory/secretory antigens of D. immitis (DiES) and the host fibrinolytic system and many of the molecules identified here are shared by both antigens, we hypothesize that DiSAA cooperate in host fibrinolytic system activation promoting the fibrin clot lysis.
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Simón F, Siles-Lucas M, Morchón R, González-Miguel J, Mellado I, Carretón E, Montoya-Alonso JA. Human and animal dirofilariasis: the emergence of a zoonotic mosaic. Clin Microbiol Rev 2012; 25:507-44. [PMID: 22763636 PMCID: PMC3416488 DOI: 10.1128/cmr.00012-12] [Citation(s) in RCA: 492] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Dirofilariasis represents a zoonotic mosaic, which includes two main filarial species (Dirofilaria immitis and D. repens) that have adapted to canine, feline, and human hosts with distinct biological and clinical implications. At the same time, both D. immitis and D. repens are themselves hosts to symbiotic bacteria of the genus Wolbachia, the study of which has resulted in a profound shift in the understanding of filarial biology, the mechanisms of the pathologies that they produce in their hosts, and issues related to dirofilariasis treatment. Moreover, because dirofilariasis is a vector-borne transmitted disease, their distribution and infection rates have undergone significant modifications influenced by global climate change. Despite advances in our knowledge of D. immitis and D. repens and the pathologies that they inflict on different hosts, there are still many unknown aspects of dirofilariasis. This review is focused on human and animal dirofilariasis, including the basic morphology, biology, protein composition, and metabolism of Dirofilaria species; the climate and human behavioral factors that influence distribution dynamics; the disease pathology; the host-parasite relationship; the mechanisms involved in parasite survival; the immune response and pathogenesis; and the clinical management of human and animal infections.
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Affiliation(s)
- Fernando Simón
- Laboratory of Parasitology, Faculty of Pharmacy and IBSAL, University of Salamanca, Spain.
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