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MiR-424 and miR-27a increase TRAIL sensitivity of acute myeloid leukemia by targeting PLAG1

Yan-Ping Sun1, Fei Lu1, Xiao-Yu Han1

  • 1Department of Hematology, Qilu Hospital, Shandong University, Jinan 250012, China.

Oncotarget
|March 26, 2016
PubMed

Insights

This study reveals that lower miR-424&27a levels contribute to TRAIL resistance in acute myeloid leukemia (AML). Restoring miR-424&27a or reducing PLAG1 enhances TRAIL sensitivity, offering potential therapeutic strategies for AML.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • MicroRNAs (miRNAs) are implicated in various cellular processes, but their role in TRAIL resistance in acute myeloid leukemia (AML) is not well understood.
  • TRAIL (TNF-related apoptosis-inducing ligand) therapy is a potential treatment for AML, but resistance remains a significant clinical challenge.

Purpose of the Study:

  • To investigate the function of miR-424&27a in TRAIL resistance in acute myeloid leukemia (AML).
  • To elucidate the molecular mechanisms underlying miR-424&27a's effect on TRAIL sensitivity in AML cells.

Main Methods:

  • Quantitative real-time PCR to measure miRNA and mRNA expression levels.
  • Transfection of AML cell lines with miR-424&27a mimics or inhibitors, and PLAG1 siRNA.
  • Western blot analysis to assess protein expression (Bcl2, Caspase3, PARP, Caspase8).
  • Luciferase reporter assays to evaluate PLAG1's effect on Bcl2 promoter activity.

Main Results:

  • Lower expression of miR-424&27a was observed in TRAIL-resistant AML cells and patient samples.
  • Overexpression of miR-424&27a increased TRAIL sensitivity by targeting PLAG1.
  • Knockdown of PLAG1 also sensitized AML cells to TRAIL, reducing proliferation and inducing apoptosis.
  • PLAG1 positively regulated Bcl2 expression; its downregulation led to decreased Bcl2 levels and increased apoptosis markers (cleaved Caspase8, Caspase3, PARP).
  • Restoring Bcl2 expression counteracted the TRAIL-sensitizing effects of miR-424&27a overexpression or PLAG1 knockdown.

Conclusions:

  • miR-424&27a enhances TRAIL sensitivity in AML by downregulating PLAG1, which in turn reduces Bcl2 expression.
  • The miR-424&27a/PLAG1/Bcl2 axis represents a critical pathway in AML TRAIL resistance.
  • miR-424&27a and PLAG1 are potential therapeutic targets for overcoming TRAIL resistance in AML treatment.
Keywords:
PLAG1TRAIL resistanceacute myeloid leukemiamiR-27amiR-424

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