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EZH2 Inhibitors: The Unpacking Revolution

Vera Adema1, Simona Colla2

  • 1Department of Leukemia, The University of Texas, MD Anderson Cancer Center, Houston, Texas.

Cancer Research
|February 3, 2022
PubMed

Insights

EZH2 inhibitors can reverse gene silencing in acute myeloid leukemia (AML) cells. This pretreatment enhances chemotherapy effectiveness, leading to increased cancer cell death and reduced side effects.

Area of Science:

  • Epigenetics and Cancer Biology
  • Chromatin Regulation
  • Molecular Oncology

Background:

  • Histone H3 lysine 27 trimethylation (H3K27me3) is a repressive chromatin mark linked to gene silencing.
  • Enhancer of zeste homolog 2 (EZH2) is the enzyme responsible for catalyzing H3K27me3.
  • Acute myeloid leukemia (AML) is a hematological malignancy often characterized by aberrant gene expression.

Purpose of the Study:

  • To investigate the effect of EZH2 inhibition on H3K27me3-marked chromatin in AML cells.
  • To determine if EZH2 inhibition can sensitize AML cells to DNA-damaging chemotherapeutic agents.
  • To explore the potential of combining EZH2 inhibitors with chemotherapy for improved AML treatment.

Main Methods:

  • Treatment of AML cells with EZH2 inhibitors.
  • Assessment of chromatin accessibility and DNA damage.
  • Evaluation of apoptosis induction and gene expression changes following combination therapy.

Main Results:

  • Pretreatment with EZH2 inhibitors successfully opened H3K27me3-marked chromatin in AML cells.
  • This chromatin modulation significantly enhanced DNA damage and apoptosis induced by topoisomerase II inhibitors (doxorubicin, etoposide).
  • The combination of EZH2 inhibitor and doxorubicin promoted the expression of proapoptotic genes, contributing to AML cell death.

Conclusions:

  • EZH2 inhibition can overcome chromatin-based gene silencing in AML.
  • Combining EZH2 inhibitors with DNA-damaging agents represents a promising strategy to improve AML treatment efficacy.
  • This approach may allow for lower chemotherapy doses, potentially reducing treatment-related toxicity.

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