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The Brain Microenvironment Induces DNMT1 Suppression and Indolence of Metastatic Cancer Cells

Eishu Hirata1,2, Kojiro Ishibashi1, Shinji Kohsaka3

  • 1Division of Tumor Cell Biology and Bioimaging, Cancer Research Institute of Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.

Iscience
|September 5, 2020
PubMed

Insights

Cancer cells in the brain survive by downregulating DNA methyltransferase 1 (DNMT1), which halts proliferation and activates survival pathways. This explains why indolent cancer cells persist in the brain microenvironment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Neuroscience

Background:

  • Brain metastasis is a complex process where cancer cells often enter an indolent state after reaching the brain.
  • Non-proliferating melanoma cells in brain metastases show gene expression linked to DNA methyltransferase 1 (DNMT1) inhibition.

Purpose of the Study:

  • To investigate the role of DNMT1 inhibition in cancer cell adaptation and survival within the brain microenvironment.
  • To understand the molecular mechanisms underlying the persistence of indolent cancer cells in the brain.

Main Methods:

  • Single-cell RNA sequencing of melanoma brain metastases.
  • Analysis of gene expression patterns in non-proliferating cancer cells.
  • Investigating the impact of the brain microenvironment (reactive astrocytes, soft mechanics) on DNMT1 expression.

Main Results:

  • DNMT1 suppression was observed in non-proliferating melanoma brain metastases.
  • The brain microenvironment, including astrocytes and soft surroundings, suppresses DNMT1 and delays cell cycle.
  • DNMT1 suppression activates pro-survival genes (e.g., L1CAM, CRYAB) and restricts proliferation.

Conclusions:

  • DNMT1 suppression is a critical adaptation for cancer cell survival in the brain.
  • Transcriptional changes due to DNMT1 inhibition facilitate cancer cell persistence and dormancy.
  • The dual effect of DNMT1 suppression (survival and proliferation restriction) explains indolent cancer cell presence in the brain.
Keywords:
Biological SciencesCancerCell BiologyTranscriptomics

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