Pde4 mediates MHCII expression in oligodendroglia
Miguel M Madeira1,2,3, Zachary Hage1,2,3, Dimitris Koliatsis1,2
1Molecular and Cellular Pharmacology Graduate Program, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY 11794.
Summary
Chronic stress triggers immune-like oligodendrocytes (ImOLs) in the brain, linked to Major Depressive Disorder (MDD). Targeting Pde4b-cAMP-integrated stress response (ISR) signaling may offer new treatments for stress-related disorders.
Area of Science:
- Neuroscience
- Immunology
- Molecular Biology
Background:
- Chronic psychosocial stress is a key factor in Major Depressive Disorder (MDD) development.
- The specific glial mechanisms linking stress to myelin and immune alterations in MDD are not fully understood.
Purpose of the Study:
- To investigate the role of oligodendroglia in mediating the effects of chronic stress on brain function.
- To identify molecular targets for potential therapeutic interventions in stress-related disorders.
Main Methods:
- Utilized chronic social defeat stress model in mice.
- Performed single-nucleus RNA sequencing on anterior medial prefrontal cortex (mPFC) oligodendroglia.
- Integrated findings with human MDD single-nucleus RNA sequencing data.
- Investigated PDE4 inhibition and integrated stress response (ISR) modulation in vivo.
Main Results:
- Identified a novel oligodendrocyte subset (ImOL) expressing immune genes (MHCII) and Pde4b, predominantly in stress-susceptible animals.
- Confirmed conserved ImOL subset in human MDD patients.
- PDE4 inhibition modulated cAMP signaling and blocked IFNγ-induced MHCII expression.
- In vivo ISR modulation affected ImOL prevalence and stress-related behaviors.
Conclusions:
- Pde4b-cAMP-ISR signaling regulates oligodendroglial immune phenotypes.
- This pathway represents a promising target for modulating myelination and neuroinflammation in MDD and other stress-related conditions.
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