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Circulating microRNAs as stable blood-based markers for cancer detection

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TLDR
It is shown here that miRNAs are present in human plasma in a remarkably stable form that is protected from endogenous RNase activity and established the measurement of tumor-derived mi RNAs in serum or plasma as an important approach for the blood-based detection of human cancer.
Abstract
Improved approaches for the detection of common epithelial malignancies are urgently needed to reduce the worldwide morbidity and mortality caused by cancer. MicroRNAs (miRNAs) are small (≈22 nt) regulatory RNAs that are frequently dysregulated in cancer and have shown promise as tissue-based markers for cancer classification and prognostication. We show here that miRNAs are present in human plasma in a remarkably stable form that is protected from endogenous RNase activity. miRNAs originating from human prostate cancer xenografts enter the circulation, are readily measured in plasma, and can robustly distinguish xenografted mice from controls. This concept extends to cancer in humans, where serum levels of miR-141 (a miRNA expressed in prostate cancer) can distinguish patients with prostate cancer from healthy controls. Our results establish the measurement of tumor-derived miRNAs in serum or plasma as an important approach for the blood-based detection of human cancer.

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Identification of serum and tissue micro-RNA expression profiles in different stages of inflammatory bowel disease

TL;DR: The results suggest the existence of specific miRNA expression patterns associated with IBD and their different stages and support the utility of miRNAs as possible biomarkers and needs to be validated in a large prospective cohort.
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Role of microRNAs in the modulation of diabetic retinopathy

TL;DR: Understanding MiRNAs implication in DR could be helpful for developing new gain- or loss- of -function strategies in order to establish effective treatments and reduce the rate of visual disability due to progression of retinopathy.
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MicroRNA-29 fine-tunes the expression of key FOXA2-activated lipid metabolism genes and is dysregulated in animal models of insulin resistance and diabetes.

TL;DR: It is demonstrated by deep sequencing and real-time quantitative PCR that hepatic levels of Foxa2 mRNA and miR-29 are elevated in a mouse model of diet-induced insulin resistance and that miR -29 fine-tunes FOXA2-mediated activation of key lipid metabolism genes, including PPARGC1A, HMGCS2, and ABHD5.
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microRNA expression profiling on individual breast cancer patients identifies novel panel of circulating microRNA for early detection.

TL;DR: A novel approach which relies on the isolation of circulating microRNAs through an enrichment step using speed-vacuum concentration which resulted in 5-fold increase in microRNA abundance led to the identification of a novel microRNA panel which was upregulated in BC patients with potential utilization in disease diagnosis and stratification.
Journal ArticleDOI

Predictive value of circulating miR-328 and miR-134 for acute myocardial infarction

TL;DR: In this paper, the diagnostic and prognostic value of miRNAs in patients with acute myocardial infarction (AMI) was evaluated by quantitative real-time PCR in plasma samples from 359 AMI patients and 30 healthy volunteers.
References
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Journal ArticleDOI

Exosome-mediated transfer of mRNAs and microRNAs is a novel mechanism of genetic exchange between cells

TL;DR: It is shown that exosomes contain both mRNA and microRNA, which can be delivered to another cell, and can be functional in this new location, and it is proposed that this RNA is called “exosomal shuttle RNA” (esRNA).
Journal ArticleDOI

MicroRNA expression profiles classify human cancers

TL;DR: A new, bead-based flow cytometric miRNA expression profiling method is used to present a systematic expression analysis of 217 mammalian miRNAs from 334 samples, including multiple human cancers, and finds the miRNA profiles are surprisingly informative, reflecting the developmental lineage and differentiation state of the tumours.
Journal Article

MicroRNA signatures in human cancers

TL;DR: The causes of the widespread differential expression of miRNA genes in malignant compared with normal cells can be explained by the location of these genes in cancer-associated genomic regions, by epigenetic mechanisms and by alterations in the miRNA processing machinery as discussed by the authors.
Journal Article

Oncomirs : microRNAs with a role in cancer

TL;DR: I MicroRNAs (miRNAs) are an abundant class of small non-protein-coding RNAs that function as negative gene regulators as discussed by the authors, and have been shown to repress the expression of important cancer-related genes and might prove useful in the diagnosis and treatment of cancer.
Journal ArticleDOI

Real-time quantification of microRNAs by stem–loop RT–PCR

TL;DR: A novel microRNA quantification method has been developed using stem–loop RT followed by TaqMan PCR analysis, which enables fast, accurate and sensitive miRNA expression profiling and can identify and monitor potential biomarkers specific to tissues or diseases.
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