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MicroRNA-93 Targets p21 and Promotes Proliferation in Mycosis Fungoides T Cells.

Authors :
Gluud, Maria
Fredholm, Simon
Blümel, Edda
Willerslev-Olsen, Andreas
Buus, Terkild Brink
Nastasi, Claudia
Krejsgaard, Thorbjørn
Bonefeld, Charlotte Menné
Woetmann, Anders
Iversen, Lars
Litman, Thomas
Geisler, Carsten
Ødum, Niels
Lindahl, Lise M.
Source :
Dermatology (10188665); 2021, Vol. 237 Issue 2, p277-282, 6p
Publication Year :
2021

Abstract

Background: Mycosis fungoides (MF), the most common form of cutaneous T-cell lymphoma (CTCL), is a lymphoproliferative disorder characterized by proliferation of malignant T cells in a chronic inflammatory environment in the skin. The nature of MF is still not fully understood, but aberrant microRNA (miR) expression and function seem to play an important role in the pathogenesis and disease progression and have been proposed as a putative disease marker. Recent studies have reported aberrant expression of miR-93 in situin MF lesions and linked dysregulated miR-93 expression to advanced stages of MF. However, the pathophysiological role of miR-93 in MF is unknown. Objective: Here, we provide the first evidence that miR-93 targets the cell cycle regulator cyclin-dependent kinase inhibitor p21 and promotes growth of malignant T cells in MF. Methods/Results: Thus, inhibition of miR-93 in MF patient-derived malignant T-cell lines increases expression of p21 and inhibition of malignant proliferation. Notably, treatment with the histone deacetylase inhibitor Vorinostat (SAHA) reduces miR-93 expression and enhances p21 expression in the malignant T cells. Importantly, transfection with an miR-93 mimic partly blocks SAHA-induced p21 expression. Conclusions: we provide evidence that enhanced expression of the putative oncogenic miR, miR-93, represses the cell cycle inhibitor p21 and promotes proliferation of malignant T cells. Moreover, we demonstrate that SAHA triggers p21 expression – at least partly – through an inhibition of miR-93. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10188665
Volume :
237
Issue :
2
Database :
Complementary Index
Journal :
Dermatology (10188665)
Publication Type :
Academic Journal
Accession number :
149338167
Full Text :
https://doi.org/10.1159/000505743