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MicroRNAs mark in the MLL-rearranged leukemia
Leonidas Benetatos1, George Vartholomatos
1Blood Bank, General Hospital of Preveza, Selefkias 2, 48100, Preveza, Greece, benetatosleon@yahoo.com.
Annals of Hematology
|June 4, 2013
Summary
MicroRNAs regulate cell processes and are deregulated in acute leukemia. Targeting microRNA expression offers a promising therapeutic strategy for MLL-rearranged leukemias.
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- MicroRNAs (miRNAs) are key regulators of cellular processes like differentiation and apoptosis, often dysregulated in acute leukemia.
- Mixed lineage leukemia (MLL) gene rearrangements are linked to poor prognosis in acute myeloid and lymphoblastic leukemia.
- MLL proteins are crucial for hematopoietic stem cell development, regulating HOXA and MEIS1 expression.
Purpose of the Study:
- To explore the intricate relationship between microRNAs and MLL gene rearrangements in acute leukemia.
- To understand how MLL fusion genes influence microRNA expression and contribute to leukemogenesis.
- To evaluate microRNA modulation as a potential therapeutic strategy for MLL-rearranged leukemias.
Main Methods:
- Analysis of the regulatory interplay between microRNAs and MLL fusion genes.
- Investigation of epigenetic mechanisms, including DNA methylation, controlling microRNA expression in MLL-rearranged leukemia.
- Examination of the involvement of cell cycle regulators (e.g., MYC, FLT3) in the MLL-miRNA network.
Main Results:
- MicroRNAs and MLL rearrangements exhibit a strong association, mutually regulating each other's expression.
- MLL fusion genes can epigenetically control microRNA expression by recruiting DNA methyltransferases.
- This complex network involves key factors like MYC and FLT3, contributing to leukemogenesis.
Conclusions:
- MicroRNA dysregulation is closely linked to MLL gene rearrangements in acute leukemia.
- Epigenetic modifications by MLL fusion genes significantly impact microRNA expression.
- Modulating microRNA expression presents a viable therapeutic avenue for difficult-to-treat MLL-rearranged leukemias.
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