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A magnetic bead-mediated selective adsorption strategy for extracellular vesicle separation and purification.
Acta Biomater. 2021 04 01; 124:336-347.AB

Abstract

Extracellular vesicles (EVs) are membrane-encapsulated particles with critical biomedical functions, including mediating intercellular communication, assisting tumor metastasis, and carrying protein and microRNA biomarkers. The downstream applications of EVs are greatly influenced by the quality of the isolated EVs. However, almost none of the separation methods can simultaneously achieve both high yield and high purity of the isolated EVs, thus making the isolation of EVs an essential challenge in EV research. Here, we developed a magnetic bead-mediated selective adsorption strategy (MagExo) for easy-to-operate EV isolation. Benefited from the presence of an adsorption window between EVs and proteins under the effect of a hydrophilic polymer, EVs tend to adsorb on the surface of magnetic beads selectively and can be separated from biological fluids with high purity by simple magnetic separation. The proposed method was used for EV isolation from plasma and cell culture media (CCM), with two times higher yield and comparable purity of the harvested EVs to that obtained by ultracentrifugation (UC). Downstream applications in proteomics analysis showed 86.6% (plasma) and 86.5% (CCM) of the analyzed proteins were matched with the ExoCarta database, which indicates MagExo indeed enriches EVs efficiently. Furthermore, we found the target RNA amount of the isolated EVs by MagExo were almost dozens and hundred times higher than the gold standard DG-UC and ultracentrifugation (UC) methods, respectively. All the results show that MagExo is a reliable, easy, and efficient approach to harvest EVs for a wide variety of downstream applications with minimized sample usage. STATEMENT OF SIGNIFICANCE: Extracellular vesicles (EVs) are presently attracting increasing interest among clinical and scientific researchers. Although the downstream applications of EVs are recognized to be greatly affected by the quality of the isolated EVs, almost none of the separation methods can simultaneously achieve high yield and high purity of the isolated EVs; this makes the isolation of EVs an essential challenge in EV research. In the present work, we proposed a simple and easy-to-operate method (MagExo) for the separation and purification of EVs based on the phenomenon that EVs can be selectively adsorbed on the surface of magnetic microspheres in the presence of a hydrophilic polymer. The performance of MagExo was comparable to or even better than that of gold standard methods and commercial kits, with two times higher yield and comparable purity of the harvested EVs to that achieved with ultracentrifugation (UC); this could meet the requirements of various EV-associated downstream applications. In addition, MagExo can be easily automated by commercial liquid workstations, thus significantly improving the isolation throughput and paving a new way in clinical diagnosis and treatment.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Fang X
School of Biomedical Engineering /Med-X Research Institute, Shanghai Jiaotong University, Shanghai, PR China.
Chen C
School of Biomedical Engineering /Med-X Research Institute, Shanghai Jiaotong University, Shanghai, PR China.
Liu B
School of Biomedical Engineering /Med-X Research Institute, Shanghai Jiaotong University, Shanghai, PR China.
Ma Z
School of Biomedical Engineering /Med-X Research Institute, Shanghai Jiaotong University, Shanghai, PR China.
Hu F
School of Biomedical Engineering /Med-X Research Institute, Shanghai Jiaotong University, Shanghai, PR China.
Li H
School of Biomedical Engineering /Med-X Research Institute, Shanghai Jiaotong University, Shanghai, PR China.
Gu H
School of Biomedical Engineering /Med-X Research Institute, Shanghai Jiaotong University, Shanghai, PR China. Electronic address: hcgu@sjtu.edu.cn.
Xu H
School of Biomedical Engineering /Med-X Research Institute, Shanghai Jiaotong University, Shanghai, PR China. Electronic address: xuhong@sjtu.edu.cn.

MeSH

AdsorptionExtracellular VesiclesMagnetic PhenomenaMicroRNAsUltracentrifugation

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

33578055

Citation

Fang, Xiaoxia, et al. "A Magnetic Bead-mediated Selective Adsorption Strategy for Extracellular Vesicle Separation and Purification." Acta Biomaterialia, vol. 124, 2021, pp. 336-347.
Fang X, Chen C, Liu B, et al. A magnetic bead-mediated selective adsorption strategy for extracellular vesicle separation and purification. Acta Biomater. 2021;124:336-347.
Fang, X., Chen, C., Liu, B., Ma, Z., Hu, F., Li, H., Gu, H., & Xu, H. (2021). A magnetic bead-mediated selective adsorption strategy for extracellular vesicle separation and purification. Acta Biomaterialia, 124, 336-347. https://doi.org/10.1016/j.actbio.2021.02.004
Fang X, et al. A Magnetic Bead-mediated Selective Adsorption Strategy for Extracellular Vesicle Separation and Purification. Acta Biomater. 2021 04 1;124:336-347. PubMed PMID: 33578055.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A magnetic bead-mediated selective adsorption strategy for extracellular vesicle separation and purification. AU - Fang,Xiaoxia, AU - Chen,Cang, AU - Liu,Bing, AU - Ma,Zhijie, AU - Hu,Fenglin, AU - Li,Haiyan, AU - Gu,Hongchen, AU - Xu,Hong, Y1 - 2021/02/10/ PY - 2020/07/24/received PY - 2021/01/19/revised PY - 2021/02/02/accepted PY - 2021/2/13/pubmed PY - 2021/5/15/medline PY - 2021/2/12/entrez KW - Cell culture KW - Exosomes KW - Extracellular vesicles KW - Isolation KW - Magnetic beads KW - Plasma SP - 336 EP - 347 JF - Acta biomaterialia JO - Acta Biomater VL - 124 N2 - Extracellular vesicles (EVs) are membrane-encapsulated particles with critical biomedical functions, including mediating intercellular communication, assisting tumor metastasis, and carrying protein and microRNA biomarkers. The downstream applications of EVs are greatly influenced by the quality of the isolated EVs. However, almost none of the separation methods can simultaneously achieve both high yield and high purity of the isolated EVs, thus making the isolation of EVs an essential challenge in EV research. Here, we developed a magnetic bead-mediated selective adsorption strategy (MagExo) for easy-to-operate EV isolation. Benefited from the presence of an adsorption window between EVs and proteins under the effect of a hydrophilic polymer, EVs tend to adsorb on the surface of magnetic beads selectively and can be separated from biological fluids with high purity by simple magnetic separation. The proposed method was used for EV isolation from plasma and cell culture media (CCM), with two times higher yield and comparable purity of the harvested EVs to that obtained by ultracentrifugation (UC). Downstream applications in proteomics analysis showed 86.6% (plasma) and 86.5% (CCM) of the analyzed proteins were matched with the ExoCarta database, which indicates MagExo indeed enriches EVs efficiently. Furthermore, we found the target RNA amount of the isolated EVs by MagExo were almost dozens and hundred times higher than the gold standard DG-UC and ultracentrifugation (UC) methods, respectively. All the results show that MagExo is a reliable, easy, and efficient approach to harvest EVs for a wide variety of downstream applications with minimized sample usage. STATEMENT OF SIGNIFICANCE: Extracellular vesicles (EVs) are presently attracting increasing interest among clinical and scientific researchers. Although the downstream applications of EVs are recognized to be greatly affected by the quality of the isolated EVs, almost none of the separation methods can simultaneously achieve high yield and high purity of the isolated EVs; this makes the isolation of EVs an essential challenge in EV research. In the present work, we proposed a simple and easy-to-operate method (MagExo) for the separation and purification of EVs based on the phenomenon that EVs can be selectively adsorbed on the surface of magnetic microspheres in the presence of a hydrophilic polymer. The performance of MagExo was comparable to or even better than that of gold standard methods and commercial kits, with two times higher yield and comparable purity of the harvested EVs to that achieved with ultracentrifugation (UC); this could meet the requirements of various EV-associated downstream applications. In addition, MagExo can be easily automated by commercial liquid workstations, thus significantly improving the isolation throughput and paving a new way in clinical diagnosis and treatment. SN - 1878-7568 UR - https://www.unboundmedicine.com/medline/citation/33578055/A_magnetic_bead_mediated_selective_adsorption_strategy_for_extracellular_vesicle_separation_and_purification_ DB - PRIME DP - Unbound Medicine ER -