Size Exclusion Chromatography for Separating Extracellular Vesicles from Conditioned Cell Culture Media

Madison T. Jones; Samantha W. Manioci; Ashley E. Russell

doi:10.3791/63614

Cromatografía de exclusión de tamaño para separar vesículas extracelulares de medios de cultivo c...

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Size Exclusion Chromatography for Separating Extracellular Vesicles from Conditioned Cell Culture Media

Cromatografía de exclusión de tamaño para separar vesículas extracelulares de medios de cultivo celular condicionados

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10:46 min

May 13, 2022

DOI: 10.3791/63614-v

Madison T. Jones¹, Samantha W. Manioci¹, Ashley E. Russell^1,2

¹Department of Biology, School of Science,Penn State Erie, The Behrend College, ²Magee Womens Research Institute—Allied Member

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Overview

This protocol demonstrates the efficient separation of extracellular vesicles (EVs) from conditioned cell culture media using size exclusion chromatography. The methodology allows researchers to analyze vesticular cargo and examine intracellular communication mechanisms.

Key Study Components

Area of Science

Cell Biology
Extracellular Vesicles
Chromatography Techniques

Background

Extracellular vesicles play a critical role in intercellular communication.
Characterizing EVs can provide insights into their biological functions.
Using size exclusion chromatography enables effective separation from proteins.
This method is user-friendly and straightforward for researchers.

Purpose of Study

To provide a reliable protocol for EV extraction.
To facilitate the characterization of EV content.
To enhance understanding of EV-mediated communication in biological systems.

Methods Used

The study employs size exclusion chromatography to separate EVs from conditioned media.
It utilizes various centrifugation steps to process the media effectively.
Sample concentrations are adjusted using ultra filtration units.
Critical steps include monitoring sample retention and washing the column.
A representative western blotting is used to verify EV marker expression.

Main Results

Strong expression of CD markers (CD9, CD63, CD81) was observed in specific EV fractions.
No expression of certain proteins (GM130, calnexin) in EV fractions indicated successful separation.
These findings support the method's effectiveness for concentrating EVs and characterizing their content.

Conclusions

The study demonstrates a reliable method for isolating EVs, enhancing research capabilities.
This method lays a foundation for further studies into EV functions and signaling pathways.
Understanding EVs can aid in developing therapeutic strategies targeting intracellular communication.

Frequently Asked Questions

What are the advantages of using size exclusion chromatography for EV isolation?

Size exclusion chromatography allows for gentle separation of extracellular vesicles from serum or conditioned media without significant protein denaturation, making it ideal for downstream analysis.

How are the extracellular vesicles prepared before chromatography?

The conditioned media is first centrifuged at various speeds to remove cellular debris and large particles, ensuring that only the desired vesicular fractions proceed to chromatography.

What types of data can be obtained from the isolated EVs?

Isolated EVs can yield molecular readouts such as protein content analysis, post-translational modifications, and potential signaling pathways involved in cellular communication.

Can this method be adapted for different biological samples?

Yes, the procedure can be modified to accommodate various fluids such as plasma, urine, or other cell culture media, allowing broad applicability in EV research.

Are there any limitations to this method?

While effective, the method may not fully separate all extracellular proteins from EVs, which could lead to some co-isolation and potential interference in downstream analyses.

How is the effectiveness of EV separation validated?

Validation is typically performed using western blot analysis to detect specific EV markers, confirming successful isolation of target vesicles.

El protocolo aquí demuestra que las vesículas extracelulares pueden separarse adecuadamente de los medios de cultivo celular condicionados utilizando cromatografía de exclusión de tamaño.

La separación de vesículas extracelulares de fluidos como los medios de cultivo celular de condición puede permitir a los investigadores caracterizar la carga vesticular y explorar sus mecanismos de comunicación intracelular. Esta técnica permite una separación suficiente de EV y proteínas extracelulares de medios de cultivo celular condicionados que es sencilla y fácil de usar. Para comenzar, coloque PBS en un baño de agua de 37 grados centígrados.

Observar los matraces de cultivo celular de control y tratados con tunicamicina bajo un microscopio compuesto con una lente objetivo de 10 x y 100 x. Tome nota de cualquier diferencia entre los frascos. Retirar el medio del matraz y colocarlo en un tubo de 50 mililitros.

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