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Published in: BMC Cancer 1/2016

Open Access 01-12-2016 | Research article

DNA in serum extracellular vesicles is stable under different storage conditions

Authors: Yang Jin, Keyan Chen, Zongying Wang, Yan Wang, Jianzhi Liu, Li Lin, Yong Shao, Lihua Gao, Huihui Yin, Cong Cui, Zhaoli Tan, Liejun Liu, Chuanhua Zhao, Gairong Zhang, Ru Jia, Lijuan Du, Yuling Chen, Rongrui Liu, Jianming Xu, Xianwen Hu, Youliang Wang

Published in: BMC Cancer | Issue 1/2016

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Abstract

Background

Extracellular vesicles (EVs), including exosomes, microvesicles, and apoptotic bodies, can be secreted by most cell types and released in perhaps all biological fluids. EVs contain multiple proteins, specific lipids and several kinds of nucleic acids such as RNAs and DNAs. Studies have found that EVs contain double-stranded DNA and that genetic information has a certain degree of consistency with tumor DNA. Therefore, if genes that exist in exosomes are stable, we may be able to use EVs genetic testing as a new means to monitor gene mutation.

Methods

In this study, EVs were extracted from serum under various storage conditions (4 °C, room temperature and repeated freeze-thaw). We used western blotting to examine the stability of serum EVs. Then, we extracted DNA from EVs and tested the concentration changing under different conditions. We further assessed the stability of EVs DNA s using polymerase chain reaction (PCR) and Sanger sequencing.

Results

EVs is stable under the conditions of 4 °C (for 24 h, 72 h, 168 h), room temperature (for 6 h, 12 h, 24 h, 48 h) and repeated freeze-thaw (after one time, three times, five times). Also, serum DNA is mainly present in EVs, especially in exosomes, and that the content and function of DNA in EVs is stable whether in a changing environment or not. We showed that EVs DNA stayed stable for 1 week at 4 °C, 1 day at room temperature and after repeated freeze-thaw cycles (less than three times). However, DNA from serum EVs after 2 days at room temperature or after five repeated freeze-thaw cycles could be used for PCR and sequencing.

Conclusions

Serum EVs and EVs DNA can remain stable under different environments, which is the premise that EVs could serve as a novel means for genetic tumor detection and potential biomarkers for cancer diagnostics and prognostics.
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Metadata
Title
DNA in serum extracellular vesicles is stable under different storage conditions
Authors
Yang Jin
Keyan Chen
Zongying Wang
Yan Wang
Jianzhi Liu
Li Lin
Yong Shao
Lihua Gao
Huihui Yin
Cong Cui
Zhaoli Tan
Liejun Liu
Chuanhua Zhao
Gairong Zhang
Ru Jia
Lijuan Du
Yuling Chen
Rongrui Liu
Jianming Xu
Xianwen Hu
Youliang Wang
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2016
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-016-2783-2

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