EV-TRACK

Search > Results

You searched for: EV170020 (EV-TRACK ID)

Showing 1 - 2 of 2

Results list Study Tree

Details	EV-TRACK ID	Experiment nr.	Species	Sample type	Separation protocol	First author	Year	EV-METRIC
	EV170020	1/2	Trypanosoma cruzi	Trypomastigote CL-Brener, Trypomastigote Sylvio, Trypomastigote Y, Trypomastigote RA	DG (d)(U)C Filtration	Caeiro, Lucas	2018	77%
Study summary Full title The protein family TcTASV-C is a novel Trypanosoma cruzi virulence factor secreted in extracellular vesicles by trypomastigotes and highly expressed in bloodstream forms. All authors Caeiro LD, Alba-Soto CD, Rizzi M, Solana ME, Rodriguez G, Chidichimo AM, Rodriguez ME, Sánchez DO, Levy GV, Tekiel V. Journal PLoS Negl Trop Dis Abstract TcTASV-C is a protein family of about 15 members that is expressed only in the trypomastigote stage (show more...)TcTASV-C is a protein family of about 15 members that is expressed only in the trypomastigote stage of Trypanosoma cruzi. We have previously shown that TcTASV-C is located at the parasite surface and secreted to the medium. Here we report that the expression of different TcTASV-C genes occurs simultaneously at the trypomastigote stage and while some secreted and parasite-associated products are found in both fractions, others are different. Secreted TcTASV-C are mainly shedded through trypomastigote extracellular vesicles, of which they are an abundant constituent, despite its scarce expression on culture-derived trypomastigotes. In contrast, TcTASV-C is highly expressed in bloodstream trypomastigotes; its upregulation in bloodstream parasites was observed in different T. cruzi strains and was specific for TcTASV-C, suggesting that some host-molecules trigger TcTASV-C expression. TcTASV-C is also strongly secreted by bloodstream parasites. A DNA prime-protein boost immunization scheme with TcTASV-C was only partially effective to control the infection in mice challenged with a highly virulent T. cruzi strain. Vaccination triggered a strong humoral response that delayed the appearance of bloodstream trypomastigotes at the early phase of the infection. Linear epitopes recognized by vaccinated mice were mapped within the TcTASV-C family motif, suggesting that blockade of secreted TcTASV-C impacts on the settlement of infection. Furthermore, although experimental and naturally T. cruzi-infected hosts did not react with antigens from extracellular vesicles, vaccinated and challenged mice recognized not only TcTASV-C but also other vesicle-antigens. We hypothesize that TcTASV-C is involved in the establishment of the initial T. cruzi infection in the mammalian host. Altogether, these results point towards TcTASV-C as a novel secreted virulence factor of T. cruzi trypomastigotes. (hide) EV-METRIC 77% (97th percentile of all experiments on the same sample type) Reported Not reported Not applicable EV-enriched proteins Protein analysis: analysis of three or more EV-enriched proteins non EV-enriched protein Protein analysis: assessment of a non-EV-enriched protein qualitative and quantitative analysis Particle analysis: implementation of both qualitative and quantitative methods. For the quantitative method, the reporting of measured EV concentration is expected. electron microscopy images Particle analysis: inclusion of a widefield and close-up electron microscopy image density gradient Separation method: density gradient, at least as validation of results attributed to EVs EV density Separation method: reporting of obtained EV density ultracentrifugation specifics Separation method: reporting of g-forces, duration and rotor type of ultracentrifugation steps antibody specifics Protein analysis: antibody clone/reference number and dilution lysate preparation Protein analysis: lysis buffer composition Study data Sample type Cell culture supernatant Sample origin Control condition Focus vesicles extracellular vesicle Separation protocol Separation protocol Gives a short, non-chronological overview of the different steps of the separation protocol. dUC = (Differential) (ultra)centrifugation DG = density gradient UF = ultrafiltration SEC = size-exclusion chromatography IAF = immuno-affinity capture DG (d)(U)C Filtration Adj. k-factor 156.9 (pelleting) / 156.9 (washing) Protein markers EV: TcTASV-C/ HSP70/ HSP70,TcTASV-C non-EV: TcSR-62 Proteomics yes Show all info Study aim Biomarker, Identification of content (omics approaches) Sample Species Trypanosoma cruzi Sample Type Cell culture supernatant EV-producing cells Trypomastigote CL-Brener, Trypomastigote Sylvio, Trypomastigote Y, Trypomastigote RA EV-harvesting Medium Serum free medium Cell viability (%) NA Separation Method (Differential) (ultra)centrifugation dUC: centrifugation steps Between 800 g and 10,000 g Between 10,000 g and 50,000 g Between 100,000 g and 150,000 g Pelleting performed Yes Pelleting: time(min) 120 Pelleting: rotor type Type 70 Ti Pelleting: speed (g) 100000 Pelleting: adjusted k-factor 156.9 Wash: time (min) 120 Wash: Rotor Type Type 70 Ti Wash: speed (g) 100000 Wash: adjusted k-factor 156.9 Density gradient Only used for validation of main results Yes Type Discontinuous Number of initial discontinuous layers 4 Lowest density fraction 0.05 Highest density fraction 0.4 Sample volume (mL) 2 Orientation Top-down (sample migrates downwards) Rotor type SW 41 Ti Speed (g) 100000 Duration (min) 1080 Fraction volume (mL) 1 Fraction processing None Filtration steps 0.45µm > x > 0.22µm, Characterization: Protein analysis Protein Concentration Method microBCA Protein Yield (µg) 0.1 Western Blot Detected EV-associated proteins HSP70,TcTASV-C Not detected contaminants TcSR-62 Proteomics database No Characterization: Lipid analysis No Characterization: Particle analysis EM EM-type Transmission-EM Image type Close-up, Wide-field Report size (nm) 50-150

	EV170020	2/2	Trypanosoma cruzi	Trypomastigote CL-Brener, Trypomastigote Sylvio, Trypomastigote Y, Trypomastigote RA	DG (d)(U)C Filtration	Caeiro, Lucas	2018	77%
Study summary Full title The protein family TcTASV-C is a novel Trypanosoma cruzi virulence factor secreted in extracellular vesicles by trypomastigotes and highly expressed in bloodstream forms. All authors Caeiro LD, Alba-Soto CD, Rizzi M, Solana ME, Rodriguez G, Chidichimo AM, Rodriguez ME, Sánchez DO, Levy GV, Tekiel V. Journal PLoS Negl Trop Dis Abstract TcTASV-C is a protein family of about 15 members that is expressed only in the trypomastigote stage (show more...)TcTASV-C is a protein family of about 15 members that is expressed only in the trypomastigote stage of Trypanosoma cruzi. We have previously shown that TcTASV-C is located at the parasite surface and secreted to the medium. Here we report that the expression of different TcTASV-C genes occurs simultaneously at the trypomastigote stage and while some secreted and parasite-associated products are found in both fractions, others are different. Secreted TcTASV-C are mainly shedded through trypomastigote extracellular vesicles, of which they are an abundant constituent, despite its scarce expression on culture-derived trypomastigotes. In contrast, TcTASV-C is highly expressed in bloodstream trypomastigotes; its upregulation in bloodstream parasites was observed in different T. cruzi strains and was specific for TcTASV-C, suggesting that some host-molecules trigger TcTASV-C expression. TcTASV-C is also strongly secreted by bloodstream parasites. A DNA prime-protein boost immunization scheme with TcTASV-C was only partially effective to control the infection in mice challenged with a highly virulent T. cruzi strain. Vaccination triggered a strong humoral response that delayed the appearance of bloodstream trypomastigotes at the early phase of the infection. Linear epitopes recognized by vaccinated mice were mapped within the TcTASV-C family motif, suggesting that blockade of secreted TcTASV-C impacts on the settlement of infection. Furthermore, although experimental and naturally T. cruzi-infected hosts did not react with antigens from extracellular vesicles, vaccinated and challenged mice recognized not only TcTASV-C but also other vesicle-antigens. We hypothesize that TcTASV-C is involved in the establishment of the initial T. cruzi infection in the mammalian host. Altogether, these results point towards TcTASV-C as a novel secreted virulence factor of T. cruzi trypomastigotes. (hide) EV-METRIC 77% (97th percentile of all experiments on the same sample type) Reported Not reported Not applicable EV-enriched proteins Protein analysis: analysis of three or more EV-enriched proteins non EV-enriched protein Protein analysis: assessment of a non-EV-enriched protein qualitative and quantitative analysis Particle analysis: implementation of both qualitative and quantitative methods. For the quantitative method, the reporting of measured EV concentration is expected. electron microscopy images Particle analysis: inclusion of a widefield and close-up electron microscopy image density gradient Separation method: density gradient, at least as validation of results attributed to EVs EV density Separation method: reporting of obtained EV density ultracentrifugation specifics Separation method: reporting of g-forces, duration and rotor type of ultracentrifugation steps antibody specifics Protein analysis: antibody clone/reference number and dilution lysate preparation Protein analysis: lysis buffer composition Study data Sample type Cell culture supernatant Sample origin Control condition Focus vesicles extracellular vesicle Separation protocol Separation protocol Gives a short, non-chronological overview of the different steps of the separation protocol. dUC = (Differential) (ultra)centrifugation DG = density gradient UF = ultrafiltration SEC = size-exclusion chromatography IAF = immuno-affinity capture DG (d)(U)C Filtration Adj. k-factor 156.9 (pelleting) / 156.9 (washing) Protein markers EV: TcTASV-C/ HSP70/ HSP70,TcTASV-C non-EV: TcSR-62 Proteomics yes Show all info Study aim Biomarker, Identification of content (omics approaches) Sample Species Trypanosoma cruzi Sample Type Cell culture supernatant EV-producing cells Trypomastigote CL-Brener, Trypomastigote Sylvio, Trypomastigote Y, Trypomastigote RA EV-harvesting Medium Serum free medium Cell viability (%) NA Separation Method (Differential) (ultra)centrifugation dUC: centrifugation steps Between 800 g and 10,000 g Between 10,000 g and 50,000 g Between 100,000 g and 150,000 g Pelleting performed Yes Pelleting: time(min) 1080 Pelleting: rotor type Type 70 Ti Pelleting: speed (g) 100000 Pelleting: adjusted k-factor 156.9 Wash: time (min) 1080 Wash: Rotor Type Type 70 Ti Wash: speed (g) 100000 Wash: adjusted k-factor 156.9 Density gradient Only used for validation of main results Yes Type Discontinuous Number of initial discontinuous layers 4 Lowest density fraction 0.05 Highest density fraction 0.4 Sample volume (mL) 2 Orientation Top-down (sample migrates downwards) Rotor type SW 41 Ti Speed (g) 100000 Duration (min) 1080 Fraction volume (mL) 1 Fraction processing None Filtration steps 0.45µm > x > 0.22µm, Characterization: Protein analysis Protein Concentration Method microBCA Protein Yield (µg) 0.15 Western Blot Detected EV-associated proteins HSP70,TcTASV-C Not detected contaminants TcSR-62 Proteomics database No Characterization: Lipid analysis No Characterization: Particle analysis EM EM-type Transmission-EM Image type Close-up, Wide-field Report size (nm) 50-150

				1 - 2 of 2

EV-TRACK ID	EV170020
species	Trypanosoma cruzi
sample type	Cell culture
cell type	Trypomastigote CL-Brener Trypomastigote Sylvio Trypomastigote Y Trypomastigote RA
condition	Control condition
separation protocol	DG (d)(U)C Filtration	DG (d)(U)C Filtration
Exp. nr.	1	2
EV-METRIC %	77	77