Stress Hormone CRH Triggers Brain Myelin Repair
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- Clemens Ries and Jan Deussing at the Max Planck Institute of Psychiatry found that roughly one-third of oligodendrocyte progenitor cells (OPCs) near damaged brain tissue release the stress hormone corticotropin-releasing hormone (CRH) — a neuropeptide capability not previously attributed to OPCs.
- CRH production begins within hours of brain injury and shuts down after about three days, then acts on CRH receptor 1 (CRHR1) on neighboring OPCs to control when those cells mature into myelin-producing oligodendrocytes.
- Mice lacking CRHR1 initially generated more OPCs after injury but ultimately produced fewer mature oligodendrocytes, leaving myelin repair incomplete.
- The same CRHR1 system shapes normal brain development — its absence produced lasting changes in myelin thickness, especially around thin axons in adult mice.
- The researchers hypothesize that during normal development neurons supply CRH to OPCs, in contrast to the injury response where OPCs themselves release the hormone.
- Study lead Jan Deussing said the CRH-OPC pathway 'may play a greater role than previously known' in stress-associated psychiatric disorders such as depression, where early-life stress is a recognized risk factor.
- The findings were published in Cell Reports (volume 44, issue 11, 2025), DOI: 10.1016/j.celrep.2025.116474.
Why it matters: The finding establishes CRH — long known as the body's stress alarm — as a direct regulator of myelin repair in mice, opening a cellular bridge between early-life stress and psychiatric disorders like depression, where childhood adversity is already an established risk factor.
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