Isolation and Characterization of Extracellular Vesicles from Adult Schistosoma japonicum
May 22nd, 2018
7.4K views
Here, we present a protocol to describe extracellular vesicles (EVs) isolation in in vitro cultured medium from adult Schistosoma japonicum.
Overview
This protocol outlines the isolation of extracellular vesicles (EVs) from the in vitro cultured medium of adult Schistosoma japonicum. The method aims to efficiently extract EVs while minimizing stress that could lead to non-physiological secretion.
Key Study Components
Area of Science
- Neuroscience
- Biology
- Parasitology
Background
- Extracellular vesicles play a crucial role in intercellular communication.
- Schistosoma japonicum is a significant parasitic worm affecting human health.
- Isolating EVs can provide insights into the biology of the parasite.
- Traditional methods may stress the parasites, affecting EV secretion.
Purpose of Study
- To develop a reliable protocol for EV isolation from Schistosoma japonicum.
- To minimize stress on the parasites during the isolation process.
- To enhance the understanding of EV roles in parasitic biology.
Methods Used
- Collecting adult Schistosoma japonicum in a beaker.
- Washing the parasites with warm PBS to remove contaminants.
- Using gravity sedimentation for parasite separation.
- Isolating EVs from the culture medium.
Main Results
- The protocol successfully isolates EVs from the cultured medium.
- Minimized stress on the parasites leads to more physiological EV secretion.
- Demonstrated efficiency in a laboratory setting.
- Provides a foundation for further studies on EVs in Schistosoma japonicum.
Conclusions
- The developed protocol is effective for isolating EVs from Schistosoma japonicum.
- Future research can build on this method to explore EV functions.
- This technique may contribute to understanding parasitic interactions and biology.
Frequently Asked Questions
What are extracellular vesicles?
Extracellular vesicles are small membrane-bound particles released by cells that play a role in cell communication.
Why is it important to isolate EVs from Schistosoma japonicum?
Isolating EVs can provide insights into the biology of the parasite and its interactions with the host.
How does this protocol minimize stress on the parasites?
The protocol uses gentle washing and sedimentation techniques to reduce stress during the isolation process.
Who demonstrated this protocol?
The protocol was demonstrated by Juntao Liu, a technician from the lab.
What is the main advantage of this EV isolation technique?
The main advantage is its efficiency in isolating EVs while minimizing potential stress on the parasites.
Can this method be applied to other organisms?
While this method is specific to Schistosoma japonicum, similar techniques may be adapted for other organisms.
Executive Industry Relevance
Isolation of extracellular vesicles from parasitic pathogens enables mechanistic de-risking of host-pathogen interaction studies. This protocol supports target validation by providing a reproducible method to isolate schistosome-derived EVs for functional analysis. The approach enhances predictive confidence in early discovery by minimizing culture-induced artifacts that could confound downstream screening or biomarker studies.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of schistosome-host communication pathways via EV-mediated signaling.
- Operational Value: Provides a standardized isolation workflow compatible with downstream omics or antibody profiling.
Screening & Assay Development
- Scientific Value: Generates quantifiable EV preparations suitable for uptake assays in mammalian cell models.
- Operational Value: Uses PKH67 labeling to enable fluorescence-based tracking of EV internalization for assay standardization.
Translational & Preclinical Research
- Scientific Value: Supports disease-relevant system studies by characterizing EVs from adult schistosomes cultured under physiological conditions.
- Operational Value: Facilitates cross-functional collaboration through defined EV size ranges (100-400 nm) and CD63-positive biomarker detection.
Pipeline & Workflow Integration
This method fits within the discovery continuum from target validation to preclinical model development by providing isolated EVs for functional interrogation.
- Discovery Biology: Supports hypothesis testing on schistosome-derived factors that modulate host immune responses.
- Screening: Enables preparation of standardized EV inputs for compound screening in host-pathogen interaction models.
- Analytics: Delivers quantitative outputs via nanoparticle tracking, TEM, and western blot for EV characterization.
- Translational Research: Connects to preclinical continuity through use of mammalian cell uptake assays relevant to tissue invasion stages.
- Enterprise Reuse: Establishes a reusable isolation platform adaptable to other parasitic systems with minimal reoptimization.
Operational & Enterprise Impact
- Scientific Value: Reduces mechanistic ambiguity in schistosome virulence studies by isolating physiologically relevant EVs.
- Operational Value: Ensures reproducibility through defined centrifugation, filtration, and dialysis steps that minimize batch variability.
- Strategic Value: Improves go/no-go decisions in antiparasitic target selection by clarifying EV-mediated mechanism of action.
- Portfolio Impact: Enables risk-adjusted prioritization of schistosome targets based on EV-associated immunomodulatory potential.
Implementation Considerations
- Requires expertise in parasite culture and extracellular vesicle handling techniques.
- Depends on access to ultracentrifugation, TEM, and fluorescence imaging infrastructure.
- Necessitates standardization across teams for consistent EV yield and purity assessment.
- Involves adaptation considerations when transferring the protocol to other schistosome species or life stages.
- Practical limitations include potential EV loss during dialysis steps and dependence on overnight incubation timelines.
Biopharma FAQs
Why does nanoparticle size analysis matter for EV isolation validation?
Nanoparticle analysis confirmed the isolated SjEVs range between 100 and 400 nm, with a peak near 220 nm, supporting their classification as extracellular vesicles and enabling standardization across batches.
How does CD63 western blotting support target validation in parasite-host interaction studies?
Detection of SjEVs using anti-CD63 antibodies validates the EV nature of the isolate, providing a biomarker anchor for downstream functional assays in host cells.
What quantitative measurement enables assessment of EV uptake in recipient mammalian cells?
Fluorescence microscopy of PKH67-labeled SjEVs demonstrated cytoplasmic distribution in NCTC clone 1469 cells, offering a measurable readout for internalization efficiency.
Why do replication requirements in EV isolation matter for cross-functional team alignment?
The protocol’s reliance on overnight dialysis and incubation steps necessitates standardized timing across teams to ensure reproducible EV yield and functional consistency.
What statistical analysis capability is required before implementing EV isolation in screening workflows?
Baseline characterization via nanoparticle tracking, TEM, and western blot provides the quantitative thresholds needed to compare EV preparations across experimental conditions.
Chapters in this video
0:04
Title
0:46
Isolating SjEVs from Schistosoma japonicum Cultures
3:00
Characterization of EVs by Western Blotting and TEM
4:01
Labeling Schistosoma japonicum Extracellular Vesicles with PKH67 Followed by Cell Uptake
6:15
Results: Schistosoma japonicum Extracellular Vesicle Characterization
7:17
Conclusion
