Isolation and Purification of Bacterial Extracellular Vesicles from Human Feces Using Density Gradient Centrifugation

Yicong Xue; Xixin Huang; Zihao Ou; Yuanyuan Wu; Qianbei Li; Xinyue Huang; Minghui Wen; Yan Yang; Bo Situ; Lei Zheng

doi:10.3791/65574

Isolation and Purification of Bacterial Extracellular Vesicles from Human Feces Using Density Gra...

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Isolation and Purification of Bacterial Extracellular Vesicles from Human Feces Using Density Gradient Centrifugation

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06:39 min

September 1, 2023

DOI: 10.3791/65574-v

Yicong Xue*¹, Xixin Huang*¹, Zihao Ou*¹, Yuanyuan Wu¹, Qianbei Li¹, Xinyue Huang¹, Minghui Wen¹, Yan Yang¹, Bo Situ¹, Lei Zheng¹

¹Department of Laboratory Medicine, Nanfang Hospital,Southern Medical University

Overview

This study presents a protocol for isolating and purifying bacterial extracellular vesicles (BEVs) from human feces using density gradient centrifugation (DGC). The method reduces centrifugation time significantly and enhances BEV separation from contaminants, providing a standard approach for future research on BEVs.

Key Study Components

Research Area

Bacterial extracellular vesicles
Disease diagnostics and therapeutics
Clinical and scientific applications

Background

BEVs play a critical role in intercellular communication and disease
Traditional methods for BEV isolation can be time-consuming and inefficient
There is a need for standardized protocols in BEV research

Methods Used

Density gradient centrifugation
Human fecal samples as a biological system
Ultracentrifugation technology

Main Results

Successfully isolated and purified BEVs with reduced centrifugation time
Enhanced separation of BEVs from contaminants like lipoproteins
Demonstrated applicability of the method to other biological fluids

Conclusions

The study establishes a reliable method for BEV isolation
Enhances understanding of BEV heterogeneity in human biology

Frequently Asked Questions

What are bacterial extracellular vesicles?

Bacterial extracellular vesicles are membrane-bound particles released by bacteria that can influence various biological processes.

How does density gradient centrifugation work for isolating BEVs?

It uses layers of different densities to separate vesicles based on their size and density during centrifugation.

Can this method be applied to other biological fluids?

Yes, with appropriate modifications, this method can be adapted for use with other body fluids.

What makes this method reliable?

The reduced centrifugation time and improved separation techniques contribute to its reliability.

What potential applications are there for this research?

It may aid in diagnostics, therapeutics, and understanding bacterial behavior and interactions in human health.

How do BEVs contribute to our understanding of cell biology?

BEVs carry molecular signals that play a role in cell communication, thus providing insights into bacterial roles in health and disease.

This study describes a method to isolate and purify bacterial extracellular vesicles (BEVs) enriched from human feces via density gradient centrifugation (DGC), identifies the physical characteristics of BEVs from morphology, particle size, and concentration, and discusses the potential applications of the DGC approach in clinical and scientific research.

Our study isolates, purifies, and characterizes bacterial extracellular vesicles from feces using density gradient centrifugation. We aim to adjust the separation of BEVs from contaminants and provide a reliable method for researchers. Our protocol reduces centrifugation time from 18 to seven hours.

Top-down mode improves BEV separation and reduces contamination from lipoproteins. Our method simplifies the separation of BEVs, setting a standard for future studies. It can be applied to other body fluids with appropriate modification, enhancing our understanding and facilitating the study of BEVs, revealing their inherent heterogeneity within the human body.

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