What types of EV sources do you accept?

We accept conditioned medium from various producer cells including mesenchymal stem cells, immune cells, and tumor cell lines. The specific source and culture conditions are scoped during project consultation.

Which target cell types can be used?

We work with a range of human and mouse cell lines and primary cells. Please discuss your specific cell type during project scoping to confirm compatibility and culture requirements.

What controls are included in the assays?

Standard controls include vehicle-only treatment, no-EV control, and appropriate positive or negative controls for the chosen endpoint. Details are confirmed in the study plan.

How are EV doses determined?

EV doses are based on particle number or protein concentration, with a pilot range to establish dose-response relationships. The final dose range is scoped per project.

Can I perform time-course experiments?

Yes, time-course experiments can be designed to capture early and late functional changes. The number of time points is determined during consultation.

Is the service suitable for IND-enabling studies?

The data generated can support early-stage preclinical development, but any specific regulatory requirements should be discussed during project scoping.

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EV In Vitro Efficacy & Mechanism Research Service

EV Efficacy Testing

Comprehensive in vitro evaluation of extracellular vesicle bioactivity, including uptake, functional effects, and signaling pathways in relevant cell models.

EV isolation and characterization from conditioned medium
Target cell treatment with defined EV doses
Efficacy endpoints (viability, migration, cytokine release)
Mechanism of action studies (inhibitor, receptor, signaling)
Customizable assay panels and cell models

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Why validate EV function in vitro?

Assess EV bioactivity, cargo delivery, and mechanism before advancing to in vivo models.

Rigorous characterization of EV batch quality
Customizable assay selection per project needs
Cell-type specific models for physiological relevance
Quantitative, reproducible endpoints with controls

Reproducible

Quantitative

Mechanistic

Our Approach

Integrated EV Functional Evaluation

From purified EVs to actionable biological insights.

EV Isolation & Characterization

Purify EVs from conditioned medium using optimized protocols and confirm size, concentration, and marker expression.

Ultracentrifugation, size-exclusion, or precipitation methods
NTA, TEM, Western blot for tetraspanins (CD9, CD63, CD81)
Protein or lipid quantification for dosing

In Vitro Functional & Mechanistic Assays

Treat relevant target cells with defined EV doses and assess cellular responses and signaling pathways.

Cell viability, proliferation, migration, scratch wound assays
Cytokine ELISA, flow cytometry, immunostaining
Pathway inhibition (receptor blocking, endocytosis inhibitors)

Stringent Quality Control

Each EV batch characterized for purity, size distribution, and marker profile to ensure reproducibility across experiments.

Statistical Rigor

Multi-replicate experiments with appropriate controls (no-EV, vehicle) and proper statistical analysis for meaningful conclusions.

Biological Interpretation

Mechanistic data interpreted in the context of known EV cargo and target cell signaling networks to guide next steps.

What You Receive

Deliverables & Reporting

Clear, actionable data and comprehensive documentation.

Data Deliverables

Isolation and characterization report (NTA, WB, TEM)
Efficacy results (cell-based assay raw data and analysis)
Mechanism study data (pathway activity, inhibition effects)
Documented protocols and raw data files

Reporting & Support

Summary report with figures and statistical analysis
Interpretation of key findings and mechanism implications
Project consultation throughout the study
Final data package suitable for presentations and publications

Service Scope

Customizable Study Parameters

Flexible, project-specific scope defined during consultation.

Parameter	Typical Project Scope
EV source	Conditioned medium from producer cells (scoped per project)
Isolation method	Ultracentrifugation, size-exclusion chromatography, precipitation
Characterization methods	NTA, DLS, TEM, Western blot (tetraspanins), optional proteomics
Target cell types	Relevant human/mouse cell lines or primary cells (confirmed per project)
Efficacy endpoints	Viability, proliferation, migration, apoptosis, cytokine secretion (scoped)
Mechanism assays	Inhibitor studies, receptor blocking, signaling phosphoprotein analysis
Replicates	≥3 biological replicates per condition
Controls	Vehicle-only, no-EV, positive controls included

Our Workflow

From EV Harvest to Functional Insight

A streamlined, stepwise process designed for robust in vitro evaluation.

EV Isolation & Purification

Conditioned medium is processed by ultracentrifugation or size-exclusion chromatography to harvest extracellular vesicles free of cellular debris and soluble contaminants.

EV Characterization

Purified EVs are analyzed for size distribution (NTA), morphology (TEM), and surface marker expression (CD9, CD63, CD81) to confirm identity and purity.

Target Cell Preparation & Treatment

Relevant recipient cells are cultured, treated with defined EV concentrations across multiple time points, and monitored for uptake and functional responses.

Efficacy Assessment

Established in vitro assays (e.g., MTT, scratch wound, ELISA, flow cytometry) measure changes in viability, migration, or cytokine release.

Mechanism Elucidation

Inhibitor studies, receptor blocking, and signaling pathway analysis identify the molecular mechanisms underlying EV-mediated effects.

Applications

Research Areas We Support

Tailored in vitro models for diverse disease and therapeutic contexts.

Evaluate EV effects on immune cells

Assess how EVs influence macrophage polarization, T cell activation, or cytokine profiles in co-culture systems.

M1/M2 polarization markers
Cytokine array
Phagocytosis assay

Quantify pro-repair effects

Measure EV promotion of cell migration, proliferation, and angiogenesis in relevant cell types.

Scratch wound closure
Tube formation assay
Cell proliferation index

Study tumor cell responses

Determine EV effects on cancer cell viability, invasion, and drug sensitivity.

Apoptosis/necrosis analysis
Invasion assay (Matrigel)
Drug combination studies

FAQ

Frequently Asked Questions

Quick answers to common inquiries about our EV in vitro testing service.

We accept conditioned medium from various producer cells including mesenchymal stem cells, immune cells, and tumor cell lines. The specific source and culture conditions are scoped during project consultation.
We work with a range of human and mouse cell lines and primary cells. Please discuss your specific cell type during project scoping to confirm compatibility and culture requirements.
Standard controls include vehicle-only treatment, no-EV control, and appropriate positive or negative controls for the chosen endpoint. Details are confirmed in the study plan.
EV doses are based on particle number or protein concentration, with a pilot range to establish dose-response relationships. The final dose range is scoped per project.
Yes, time-course experiments can be designed to capture early and late functional changes. The number of time points is determined during consultation.
The data generated can support early-stage preclinical development, but any specific regulatory requirements should be discussed during project scoping.

Scientific Literature

References

Li X, La Salvia S, Liang Y, et al. Extracellular Vesicle-Encapsulated Adeno-Associated Viruses for Therapeutic Gene Delivery to the Heart. Circulation. 2023;148(5):405-425. View on PubMed
Guo Q, Chen J, Wu J, et al. Bioprinted mesenchymal stem cell microfiber-derived extracellular vesicles alleviate unilateral renal ischemia-reperfusion injury and fibrosis by inhibiting tubular epithelial cells ferroptosis. Bioactive materials. 2024;40:649-664. View on PubMed
Shi V, Wu S, Lian Q, et al. Dual-Functionalized Extracellular Vesicles Promote Brain Repair and Remodeling Following Ischemic Stroke in Mice. CNS neuroscience & therapeutics. 2025;31(9):e70597. View on PubMed
De Mitri F, Giansanti M, Melaiu O, et al. Inhibition of autophagy enhances the antitumor efficacy of T/CAR T cell against neuroblastoma. Journal of experimental & clinical cancer research: CR. 2025;44(1):185. View on PubMed
Yuan P, Deng M, Li X, et al. Lactobacillus extracellular vesicle-driven oxygen-releasing photothermal hydrogel reprograms macrophages and promotes angiogenesis to accelerate diabetic wound healing. Bioactive materials. 2025;54:144-158. View on PubMed
Hou J, Huang X, Cao X, et al. Yangyin Shugan capsule ameliorates premature ovarian insufficiency via dual receptor-mediated cascade in rats. Phytomedicine: international journal of phytotherapy and phytopharmacology. 2025;147:157139. View on PubMed

Please kindly note that our products and services are for research use only.