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Med20 regulates myelination in the peripheral nervous system by modulating ferroptosis of Schwann cells

Wenyi Yang1, Xiang Chen1, Chunyan Yang1

  • 1State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Department of Obstetrics, Women and Children's Hospital, School of Medicine, Xiamen University, Xiamen, Fujian 361102, China.

Cell Reports
|October 18, 2025
PubMed

Insights

Med20 is crucial for peripheral nervous system myelination. Its loss in Schwann cells triggers ferroptosis, impairing myelin. Inhibiting ferroptosis restores myelination in Med20-deficient mice.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Myelin sheath is vital for neural function.
  • Mediator complex (MED) is linked to neurodegenerative diseases.
  • Med20 mutations cause brain developmental issues, but its role in myelination is unclear.

Purpose of the Study:

  • Investigate Med20's role in peripheral nervous system myelination.
  • Determine the molecular mechanisms by which Med20 regulates myelination.

Main Methods:

  • Studied Med20 function in Schwann cells (SCs).
  • Analyzed the downstream targets and regulatory pathways of Med20.
  • Utilized ferroptosis inhibitors (Fer-1) and HO-1 inhibitors (ZnPP) in Med20-deficient mice models.

Main Results:

  • Med20 loss in SCs induces ferroptosis, leading to impaired myelination.
  • Med20's function in SCs is mediated by DDB1.
  • DDB1 regulates SC ferroptosis via the "DDB1-UHRF1-BACH1-Hmox1" axis and HO-1 ubiquitination.
  • Fer-1 and ZnPP treatments restored myelination in Med20-deficient mice.

Conclusions:

  • Med20 is a key regulator of myelination in the peripheral nervous system.
  • Med20 controls SC ferroptosis through the DDB1-dependent pathway.
  • Targeting ferroptosis pathways offers a potential therapeutic strategy for myelin repair.
Keywords:
CP: Developmental biologyCP: NeuroscienceDDB1Med20Schwann cellsferroptosismyelination

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