Summary

고도로 정제 된 고밀도 지단백질에서의 miRNA의 높은 넣어 관통 분리에 대한 신속하고 단순화 된 방법

Published: July 27, 2016
doi:

Summary

마이크로 RNA는 중요한 조절 역할을하고 다양한 인간 질병에 대한 새로운 치료 대상으로 떠오르고있다. miRNAs의 고밀도 지단백질에 수행되는 것을 도시하고있다. 우리는 빠른 속도로 인간 혈장에서 miRNA의 분석에 적합한 정제 HDL을 분리하는 간단한 방법을 개발했다.

Abstract

Small non-coding RNAs (miRNAs) have been implicated in a variety of human diseases including metabolic syndromes. They may be utilized as biomarkers for diagnosis and prognosis or may serve as targets for drug development, respectively. Recently it has been shown that miRNAs are carried in lipoproteins, particularly high density lipoproteins (HDL) and are delivered to recipient cells for uptake. This raises the possibility that miRNAs play a critical and pivotal role in cellular and organ function via regulation of gene expression as well as messenger for cell-cell communications and crosstalk between organs. Current methods for miRNA isolation from purified HDL are impractical when utilizing small samples on a large scale. This is largely due to the time consuming and laborious methods used for lipoprotein isolation. We have developed a simplified approach to rapidly isolate purified HDL suitable for miRNA analysis from plasma samples. This method should facilitate investigations into the role of miRNAs in health and disease and in particular provide new insights into the variety of biological functions, outside of the reverse cholesterol transport, that have been ascribed to HDL. Also, the miRNA species which are present in HDL can provide valuable information of clinical biomarkers for diagnosis of various diseases.

Introduction

MicroRNAs are endogenous non-coding tiny RNA species that are highly conserved and are considered key players in the regulation of various biological processes by degrading or repressing specific target messenger RNAs1. Because miRNAs act intracellularly they have been explored as tissue-derived biomarkers which led to the discovery of tissue-specific functions of these miRNA. However, miRNAs are also found extracellularly either associated with proteins or in exosomes/micro vesicles that effectively can shield them from degradation by extracellular RNases2. More recent studies have shown that the protective effect of HDL may not be closely linked to its capability to promote cholesterol efflux but rather to its non-cholesterol cargo, in particularly as a circulating miRNAs carrier 3, 4. These miRNAs may not only modulate lipid metabolism but are also associated with anti-inflammatory, antioxidant and antithrombotic effects of the HDL-miRNA complex 5, 6.

To further explore the role of miRNAs carried in HDL particles, a simple and easy protocol needs to be established for miRNA extraction from isolated highly purified HDL for use in clinical routine. Numerous methods have been described to isolate HDL. These methods are either very time consuming or require large volume of plasma that may require sample pooling, extensive dialysis for desalting isolated lipoproteins and they do not completely remove exosomes as a source of miRNAs3, respectively. Here we describe a simple and rapid method that can isolate miRNA from highly purified HDL utilizing small volume of blood samples on a larger scale. We believe that this method may serve as good reference to promote research into the role of circulating miRNAs and in particular the role of HDL in facilitating communication between various cells and organs.

Protocol

혈액 샘플 1. 컬렉션 전주 포사에서 눈에 띄는 정맥의 표준 정맥 천자에 의해 (다른 항응고제에 비해 몇 가지 장점이 있습니다) 항응고제 에틸렌 디아민 테트라 아세트산 (EDTA)를 포함하는 10 ML의 플라스틱 튜브에 말초 정맥 혈액 샘플을 금식 수집합니다. 적혈구 및 RNA 소량의 자유 혈장을 얻었다 탁상 원심 분리기로 4 ℃에서 20 분 동안 1,600 XG에서 혈액 샘플을 원심 분리기. ?…

Representative Results

엑소 좀 제거 후 고밀도 지단백의 분리 고순도 HDL에서의 miRNA를 얻으려면이 miRNA의 오염 (7)의 소스를 대표하는 엑소 좀을 제거 할 필요가있다. 이것은 상업적으로 이용 가능한 키트 밀도 구배 초 원심 분리에 앞서 수행 하였다. 실용적으로 상업 회사에 의해 개발 된 3 단의 ​​표준 밀도 구배 초 원심 프로토콜 (도 1)를 변…

Discussion

혈액에서 새로운 바이오 마커의 식별은 각종 질병의 임상 진단 및 예후에 도움이됩니다. 마이크로 RNA는 바이오 마커의 모든 자질을 가지고하는 것으로 알려져하고 다양한 연구 14-17에 표시되어있다. 이 연구에서 우리는 플라즈마 HDL에서의 miRNA를 분리하기 위해 신속하고 간단한 쉬운 방법을 증명하고있다. VLDL, LDL 및 HDL의 분리의 종래의 밀도 구배 초 원심 분리 방법은, 플라즈마의 정확한…

Disclosures

The authors have nothing to disclose.

Acknowledgements

This work was supported, in whole or in part, by NIH Grants R01 AA 020758-04, U01DK 061731-13 and T32 DK 007150-38 to AJS and T32 DK 007150-38 to AA. This is original work and is not under consideration elsewhere for publication.

Materials

Plastic Vacutainer Lavender K2EDTA tubes  Becton, Dickinson and Company 366643
Centrifuge Thermo Scientific, Sorvall Legend X1R  75004261
Densito 30PX densitometer Mettler Toledo MT51324450
ExoQuick solution  Invitrogen 4484451
Polycarbonate thick-walled ultracentrifuge tube Thermo Scientific O3237
Sorvall WX100 ultracentrifuge  Thermo Scientific 46902
Fat Red 7B  Sigma-Aldrich 201618
β-mercaptoethanol  Sigma-Aldrich
Amicon Ultra-15 Centrifugal filter devices 10K Millipore UFC901008
Amicon Ultra-centrifugal filter devices 3K Millipore UFC800308
QuickGel Lipo kit  Helena Laboratories  3344,3544T
Human lipoprotein standards for VLDL, LDL and HDL LipoTrol; Helena Laboratories 5069
Rep Prep buffer  Helena Laboratories  3100
RNeasy MinElute spin columns  Qiagen
NanoDrop 1000 analyzer Thermo Scientific
miScript II RT Kit  Qiagen 218161
CFX96 Touch real-time PCR detection system BioRad
miRNeasy Serum/Plasma Kit QIAGEN 217184
miScript Primer Assays QIAGEN 141078139
miScript SYBR Green PCR Kit  QIAGEN 218073
miRNeasy Serum/Plasma Spike-In Control QIAGEN 219610

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Cite This Article
Seneshaw, M., Mirshahi, F., Min, H., Asgharpour, A., Mirshahi, S., Daita, K., Boyett, S., Santhekadur, P. K., Fuchs, M., Sanyal, A. J. Fast and Simplified Method for High Through-put Isolation of miRNA from Highly Purified High Density Lipoprotein. J. Vis. Exp. (113), e54257, doi:10.3791/54257 (2016).

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