期刊
ACS BIOMATERIALS SCIENCE & ENGINEERING
卷 4, 期 2, 页码 654-662出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsbiomaterials.7b00668
关键词
microRNA extraction; magnetic nanoparticles; carboxylic acid functionalized; protein corona; cell free biofluid
资金
- NIBIB [R00EB016753]
- Department of Radiology at Michigan State University
MicroRNA (miRNA) in urine has been considered as a potential biomarker for early stage diagnosis of multiple diseases like urinary system cancer, kidney injury, and diabetes because of their many demonstrated advantages including long-term stability and noninvasiveness. However, the traditional enrichment and extraction processes of miRNAs from urine are cumbersome and tedious due to the low concentration and multiple carriers of miRNAs. Herein, we present a novel method to collect low concentrations of miRNAs from dilute solutions such as urine and cell culture medium. Ten nanometer core sized magnetic nanoparticles with carboxylic acid coating can adsorb low-concentration proteins, and form protein corona which makes them easy to aggregate and precipitate for subsequent isolation. In urine and cell culture medium, these nanoparticles can aggregate with proteins, including miRNAs-associated protein Argonaute 2 and microvesicle-related proteins, to form precipitates, so that miRNAs can be easily extracted from pellets by small amount of lysis buffer for subsequent analysis such as real-time PCR. Our method provides a facile way to enrich miRNAs from biofluids without the need of ultracentrifugation and immunoprecipitations, bringing remarkable convenience to miRNA-based biomarker research.
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