Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Down-regulation of miR-92 in human plasma is a novel marker for acute leukemia patients

ABSTRACT: MicroRNAs are a family of 19- to 25-nucleotides noncoding small RNAs that primarily function as gene regulators. Aberrant microRNA expression has been described for several human malignancies, and this new class of small regulatory RNAs has both oncogenic and tumor suppressor functions. Despite this knowledge, there is little information regarding microRNAs in blood especially because microRNAs in blood, if exist, were thought to be digested by RNase. Recent studies, however, have revealed that microRNAs exist and escape digestion in serum and plasma. Thus, we performed microRNA microaray to obtain insight into microRNA deregulation in the plasma of a leukemia patient. Here, we have revealed that microRNA-638 (miR-638) is stably present in human plasmas, and miR-92a dramatically decreased in the plasmas of acute leukemia patients. Our data indicate that the ratio of miR-92a/miR-638 in plasma has strong potential for clinical application as a novel biomarker for detection of leukemia. Seven normal samples and two acute leukemia samples ware profiled and compared.

ORGANISM(S): Homo sapiens

SUBMITTER: Masami Tanaka

PROVIDER: E-GEOD-14772 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Down-regulation of miR-92 in human plasma is a novel marker for acute leukemia patients.

Tanaka Masami M Oikawa Kosuke K Takanashi Masakatsu M Kudo Motoshige M Ohyashiki Junko J Ohyashiki Kazuma K Kuroda Masahiko M

PloS one 20090514 5

<h4>Background</h4>MicroRNAs are a family of 19- to 25-nucleotides noncoding small RNAs that primarily function as gene regulators. Aberrant microRNA expression has been described for several human malignancies, and this new class of small regulatory RNAs has both oncogenic and tumor suppressor functions. Despite this knowledge, there is little information regarding microRNAs in plasma especially because microRNAs in plasma, if exist, were thought to be digested by RNase. Recent studies, however ...[more]

PMID: 19440243

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Project description:Background: Chronic obstructive pulmonary disease (COPD) is a heterogeneous disease characterized by varying degrees of emphysematous lung destruction and small airway disease, each with distinct effects on clinical outcomes. There is little known about how microRNAs contribute specifically to the emphysema phenotype. We examined how microRNA expression is altered with regional emphysema severity within the lung and how these microRNAs regulate disease-associated gene-expression networks. Results: We profiled microRNAs in different regions in the lung with varying degrees of emphysema from 6 smokers with COPD and 2 controls (8 regions x 8 lungs = 64 samples). 63 microRNAs (p<0.05) were altered with regional emphysema severity as quantified by mean linear intercept (Lm). MicroRNA and gene expression data were then integrated in the same samples. A subset of microRNAs, including miR-638, miR-30c, and miR-181d, correlated with many of their predicted gene targets, suggesting a role in regulating the gene networks that underlie emphysematous lung destruction. Modulating miR-638 expression in primary human lung fibroblasts recapitulated the alterations in its targeted gene-expression network associated with emphysema progression. Pathway analysis revealed that genes involved in oxidative stress and accelerated aging were affected by miR-638 knock-down in fibroblasts. Many miR-638 gene targets in these pathways were amongst those negatively correlated with miR-638 expression in emphysematous lung tissue. Conclusions: Our findings demonstrate that microRNAs are altered with regional emphysema severity and modulate disease-associated gene expression networks. Furthermore, miR-638 may regulate gene expression associated with the oxidative stress response and aging in emphysematous lung tissue and fibroblasts. Paired samples were obtained from 8 regions at regular intervals between the apex and base of each explanted lung from six patients with severe COPD and two donors. The degree of emphysematous destruction was quantified in one sample from each region by mean linear intercept (Lm), while microRNA expression was profiled in the adjacent sample from the same region using the NCode Version 3 microRNA microarrays (Invitrogen, Carlsbad, CA). After quality control 60 samples were used for the analysis.

Dataset Information

Down-regulation of miR-92 in human plasma is a novel marker for acute leukemia patients

Publications

Down-regulation of miR-92 in human plasma is a novel marker for acute leukemia patients.

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