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Exosomes are small vesicles (30–120 nm) containing RNA and protein that are secreted by various types of cells in culture, and found in abundance in body fluids including blood, saliva, urine, and breast milk. Exosomes are thought to function as intercellular messengers, delivering their cargo of effector or signaling macromolecules between specific cells, however, their formation, the makeup of the cargo, and biological pathways in which they are involved remain incompletely understood. The biological study of exosome function and trafficking requires the isolation of intact exosomes, but the current methods used are tedious, non-specific, and difficult.

The Total Exosome Isolation Reagent is specifically designed for the rapid isolation of exosomes from various biological fluids. Its core principle is typically based on polymer-based precipitation.

I. Summary of the Core Principle

This reagent contains a hydrophilic polymer (such as PEG) that competes with water molecules, disrupting the solubility of extracellular vesicles like exosomes in the aqueous solution and effectively "squeezing" them out. Simultaneously, it alters the physical properties of the solution to reduce the solubility of exosomes, thereby causing them to precipitate out of solution. This is accomplished through a simple centrifugation step.

II. Key Features

1.  High Versatility

Wide range of sample sources: It can be used with various biological samples, including:

Cell culture supernatants, Serum, Plasma (requires prior removal of fibrinogen), Urine, Saliva, Cerebrospinal fluid, etc.

This allows a laboratory to optimize a single method for processing samples from multiple sources.

2.  Fast and Simple Protocol

 

The standard procedure typically takes only 30 minutes to 2 hours, which is much faster than ultracentrifugation (which often requires 4-6 hours or even overnight).

 

Simple steps: Mix the reagent with the sample → Incubate at a low temperature → Centrifuge using a standard microcentrifuge → Obtain the exosome pellet.

 

No need for special or expensive equipment.

 

3.  High Recovery Rate and Yield

 

Compared to ultracentrifugation, the polymer precipitation method typically recovers a higher number of exosome particles.

 

This is particularly advantageous for samples with low concentration or small volume, ensuring sufficient exosomes are obtained for subsequent analysis.

 

4.  Maintains Exosome Integrity and Bioactivity

 

The process is gentle, does not use detergents or harsh physical forces, and preserves the structural integrity of the exosomes well.

 

The membrane proteins and internal biomolecules (such as RNA, proteins) of the isolated exosomes retain their activity, making them suitable for functional downstream experiments.

5.  Broad Compatibility with Downstream Applications

The isolated exosomes can be used for a variety of subsequent analyses, including:

        *   Electron Microscopy (morphological observation)

        *   Nanoparticle Tracking Analysis (size and concentration measurement)

        *   Western Blot (detection of marker proteins, e.g., CD63, CD81, TSG101)

        *   RNA Analysis (including miRNA, mRNA extraction and sequencing)

        *   Proteomics Analysis

        *   Cell Co-culture Experiments (studying exosome function)

 

III. Potential Drawbacks and Considerations

To provide complete information, it is essential to mention the potential limitations of this method:

Purity Concerns: The biggest challenge is the potential for co-precipitation of non-exosomal contaminants (such as protein aggregates, lipoproteins, etc.). For experiments requiring extremely high purity (e.g., proteomics), further purification using other methods (such as size exclusion chromatography) may be necessary.

Polymer Residue: The polymer from the precipitation reagent may remain in the final exosome sample, which could potentially interfere with certain downstream analyses (for example, in Nanoparticle Tracking Analysis with some dyes, or when used directly in cell culture).

IV. Summary

The greatest advantage of the Total Exosome Isolation Reagent lies in its "efficiency" and "convenience." It provides researchers with a fast, simple, reliable, and equipment-accessible method to obtain high yields of bioactive exosomes from various samples. This makes it highly suitable for:

 

*   Preliminary screening experiments

*   High-throughput sample analysis

*   Experiments requiring rapid acquisition of exosomes for functional validation

*   Laboratories without access to an ultracentrifuge

When selecting a method, researchers need to weigh the requirements of their specific downstream applications (need for purity vs. need for speed and yield) to decide whether to use this reagent or, if necessary, perform subsequent purification steps.

Intended Use

The T-Pro Total Exosome RNA Isolation Kit is designed for isolation of RNA from a single enriched exosome preparation.

Maximal yields of ultra-pure RNA can be prepared in about 30 minutes, and are suitable for studies of RNA expression (specifically miRNA), processing, or function. The RNA can be used in downstream application, including RT-PCR, sequencing (e.g., Ion PGM™, Ion Proton™, or SOLiD® Systems), RNA amplification, microarray analyses, solution hybridization assays, and blot hybridization. 

Sample Type

This kit is suitable for extraction exosome RNA (microRNA; miRNA) from enriched exosome samples, serum, plasma, liquid transport media (e.g. UTM),culture media or clear cell-free body fluid. 

Using T-Pro Total Exosome isolation reagents to collect the exosomes from cell culture media or serum is recommended:

A. Reagent for cell culture media: (JO66-V001S)100ml/(JO66-V001M) 500ml.

B. Reagent for serum: (JO66-V002S ) 5x1ml /(JO66-V002M) 25ml. 

C. Reagent for urine: (JO66-V003S ) 100ml /(JO66-V003M) 500ml.