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Role of microRNAs and microRNA machinery in the pathogenesis of diffuse large B-cell lymphoma

S Caramuta1, L Lee, D M Ozata

  • 11] Department of Oncology-Pathology, Karolinska Institutet, Stockholm, Sweden [2] Cancer Center Karolinska, Karolinska University Hospital, Stockholm, Sweden.

Blood Cancer Journal
|October 15, 2013
PubMed

Insights

MicroRNA (miRNA) processing genes like TARBP2 are altered in diffuse large B-cell lymphoma (DLBCL). High TARBP2 and DROSHA expression correlates with poor chemotherapy response, offering new therapeutic targets for DLBCL.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNA (miRNA) deregulation is implicated in diffuse large B-cell lymphoma (DLBCL).
  • The precise role of miRNA processing machinery in DLBCL pathogenesis remains unclear.

Purpose of the Study:

  • To investigate the expression patterns of miRNAs and their processing genes in DLBCL.
  • To determine the clinical significance of miRNA machinery alterations in DLBCL.

Main Methods:

  • Microarray and RT-qPCR were used to quantify miRNA and miRNA-processing gene expression in 75 DLBCL samples and 10 lymph nodes.
  • Differential expression analysis was performed to identify distinct miRNA signatures.

Main Results:

  • Distinct miRNA signatures differentiated DLBCL from normal lymph nodes and de novo from transformed DLBCL.
  • TARBP2 was overexpressed in de novo DLBCL, while DROSHA, DICER, TARBP2, and PACT were downregulated in transformed DLBCL.
  • High TARBP2 and DROSHA expression correlated with poorer chemotherapy response.

Conclusions:

  • miRNA processing gene alterations are associated with DLBCL subtypes and clinical outcomes.
  • TARBP2 regulates miRNA processing and impacts DLBCL cell growth and apoptosis.
  • These findings offer novel insights into the role of miRNA machinery in DLBCL and suggest potential therapeutic targets.

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