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miRNAs in multiple myeloma--a survival relevant complex regulator of gene expression

Tijdschriftbijdrage - Tijdschriftartikel

PURPOSE: microRNAs regulate gene-expression in biological and pathophysiological processes, including multiple myeloma. Here we address i) What are the number and magnitude of changes in miRNA-expression between normal plasma cells and myeloma- or MGUS-samples, and the latter two? ii) What is the biological relevance and how does miRNA-expression impact on gene-expression? iii) Is there a prognostic significance, and what is its background?

EXPERIMENTAL DESIGN: Ninety-two purified myeloma-, MGUS-, normal plasma cell- and myeloma cell line-samples were investigated using miChip-arrays interrogating 559 human miRNAs. Impact on gene-expression was assessed by Affymetrix DNA-microarrays in two cohorts of myeloma patients (n = 677); chromosomal aberrations were assessed by iFISH, survival for 592 patients undergoing up-front high-dose chemotherapy.

RESULTS: Compared to normal plasma cells, 67/559 miRNAs (12%) with fold changes of 4.6 to -3.1 are differentially expressed in myeloma-, 20 (3.6%) in MGUS-samples, and three (0.5%) between MGUS and myeloma. Expression of miRNAs is associated with proliferation, chromosomal aberrations, tumor mass, and gene expression-based risk-scores. This holds true for target-gene signatures of regulated mRNAs. miRNA-expression confers prognostic significance for event-free and overall survival, as do respective target-gene signatures.

CONCLUSIONS: The myeloma-miRNome confers a pattern of small changes of individual miRNAs impacting on gene-expression, biological functions, and survival.

Tijdschrift: Oncotarget
ISSN: 1949-2553
Issue: 36
Volume: 6
Pagina's: 39165-39183
Jaar van publicatie:2015
Trefwoorden:Cell Proliferation/genetics, Cohort Studies, Gene Expression Profiling, Gene Expression Regulation, Neoplastic, Humans, MicroRNAs/biosynthesis, Multiple Myeloma/genetics, Plasma Cells/physiology, Prognosis, Survival Analysis
Toegankelijkheid:Open