Genomics

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MicroRNA expression in Sézary syndrome: Identification, function and diagnostic potential.


ABSTRACT: MicroRNAs are commonly aberrantly expressed in many cancers. Very little is known of their role in T-cell lymphoma, however. We therefore elucidated the complete miRNome of purified T-cells cells from 21 patients diagnosed with Sézary syndrome (SzS), a rare aggressive primary cutaneous T-cell (CD4+) lymphoma. Unsupervised cluster analysis of microarray data revealed that the microRNA expression profile was distinct from CD4+ T-cell controls and B-cell lymphomas. The majority (104/114) of SzS-associated microRNAs (P < 0.05) were down-regulated and their expression pattern was largely consistent with previously reported genomic copy number abnormalities and were found to be highly enriched (P < 0.0001) for aberrantly expressed target genes. Levels of miR-223 distinguished SzS samples (n = 32) from healthy controls (n = 19) and patients with mycosis fungoides (n = 11) in >90% of samples. Furthermore, we demonstrate that the down-regulation of intronically encoded miR-342 plays a role in the pathogenesis of SzS by inhibiting apoptosis and describe a novel mechanism of regulation for this microRNA via binding of miR-199a* to its host gene. We also provide the first in vivo evidence for down-regulation of the miR-17-92 cluster in malignancy and demonstrate that ectopic miR-17-5p expression increases apoptosis and decreases cell proliferation in SzS cells.

ORGANISM(S): Mus musculus Rattus norvegicus Homo sapiens Gallus gallus

PROVIDER: GSE21697 | GEO | 2010/05/12

SECONDARY ACCESSION(S): PRJNA125867

REPOSITORIES: GEO

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