MicroRNA-mediated Down-regulation of PRDM1/Blimp-1 in Hodgkin/Reed-Sternberg Cells: a Potential Pathogenetic Lesion in Hodgkin Lymphomas

Overview

Journal Am J Pathol

Publisher Elsevier

Specialty Pathology

Date 2008 Jun 28

PMID 18583325

Citations 79

Authors

Kui Nie

Mario Gomez

Pablo Landgraf

Jose-Francisco Garcia

Yifang Liu

Leonard H C Tan

Amy Chadburn

Thomas Tuschl

Daniel M Knowles

Wayne Tam

Affiliations

Soon will be listed here.

Abstract

PRDM1/Blimp-1, a master regulator in terminal B-cell differentiation, has been recently identified as a tumor suppressor target for mutational inactivation in diffuse large B-cell lymphomas of the activated B-cell type. Our studies here demonstrate that PRDM1/blimp-1 is also a target for microRNA (miRNA)-mediated down-regulation by miR-9 and let-7a in Hodgkin/Reed-Sternberg (HRS) cells of Hodgkin lymphoma (HL). MiRNA expression profiling by direct miRNA cloning demonstrated that both of these miRNAs are among the most highly expressed in cultured HRS cells. These miRNAs functionally targeted specific binding sites in the 3' untranslated region of PRDM1/blimp-1 mRNA and repressed luciferase reporter activities through repression of translation. In addition, high levels of miR-9 and let-7a in HL cell lines correlated with low levels of PRDM1/Blimp-1. Similar to their in vitro counterparts, the majority of HRS cells in primary HL cases showed weak or no PRDM1/Blimp-1 expression. Over-expression of miR-9 or let-7a reduced PRDM1/Blimp-1 levels in U266 cells by 30% to 50%, whereas simultaneous inhibition of their activities in L428 cells resulted in an approximately 2.6-fold induction in PRDM1/Blimp-1. MiRNA-mediated down-regulation of PRDM1/Blimp-1 may contribute to the phenotype maintenance and pathogenesis of HRS cells by interfering with normal B-cell terminal differentiation, thus representing a novel molecular lesion, as well as a potential therapeutic target in HL.

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