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Updated: May 16, 2025
Rapid Detection of Neurodevelopmental Phenotypes in Human Neural Precursor Cells NPCs
Published on: March 2, 2018
PD-L1/PD-1 checkpoint pathway regulates astrocyte morphogenesis and myelination during brain development
Yanyan Wang1,2, Mengtian Zhang1,2, Tianyu Zhang1,2
1Key Laboratory of Organ Regeneration and Reconstruction, Chinese Academy of Sciences, Beijing, 100101, China.
Abstract:
Programmed cell death protein 1 (PD-1) and its primary ligand PD-L1 are integral components of a significant immune checkpoint pathway, widely recognized for its central role in cancer immunotherapy. However, emerging evidence highlights their broader involvement in both the central and peripheral nervous systems. In this study, we demonstrate that PD-L1/PD-1 signaling in astrocytes during mouse brain development regulates astrocyte maturation and morphogenesis via the MEK/ERK pathway by targeting the downstream effector cysteine and glycine rich protein 1 (CSRP1). This enhanced astrocyte morphological complexity results in increased end-foot coverage of blood vessels. Additionally, aberrant secretion of CSRP1 by astrocytes interacts with oligodendrocyte precursor cells (OPCs) membrane proteins annexin A1 (ANXA1) and annexin A2 (ANXA2), leading to the exclusion of migrating OPCs from blood vessels. This disruption in OPC migration and differentiation results in abnormal myelination and is associated with cognitive deficits in the mice. Our results provide critical insights into the function of PD-L1/PD-1 signaling in astrocyte-OPC interactions and underscore its relevance to glial cell development and pathogenesis in neurodevelopmental disorders.
Insights
Programmed cell death protein 1 (PD-1) and PD-L1 signaling regulate astrocyte development and blood vessel coverage in the brain. Disruptions lead to abnormal myelination and cognitive deficits, highlighting roles in neurodevelopmental disorders.
Area of Science:
- Neuroscience
- Immunology
- Developmental Biology
Background:
- Programmed cell death protein 1 (PD-1) and its ligand PD-L1 are key immune checkpoint regulators.
- Their roles extend beyond cancer immunotherapy to the central and peripheral nervous systems.
- Understanding glial cell interactions is crucial for neurodevelopmental disorders.
Purpose of the Study:
- To investigate the role of PD-L1/PD-1 signaling in astrocyte development and function.
- To elucidate the molecular mechanisms underlying astrocyte-oligodendrocyte precursor cell (OPC) interactions.
- To explore the impact of this signaling pathway on myelination and cognitive function.
Main Methods:
- Utilized mouse models to study PD-L1/PD-1 signaling in astrocytes during brain development.
- Investigated the MEK/ERK pathway and its downstream effector, cysteine and glycine rich protein 1 (CSRP1).
- Examined astrocyte morphology, blood vessel coverage, OPC migration, myelination, and cognitive behaviors.
Main Results:
- PD-L1/PD-1 signaling in astrocytes controls maturation and morphogenesis via the MEK/ERK/CSRP1 pathway.
- Enhanced astrocyte complexity led to increased blood vessel coverage.
- Aberrant CSRP1 secretion disrupted OPC migration and myelination, causing cognitive deficits.
Conclusions:
- PD-L1/PD-1 signaling is critical for astrocyte development and astrocyte-OPC interactions.
- Dysregulation of this pathway contributes to abnormal myelination and cognitive impairments.
- This pathway represents a potential target for neurodevelopmental disorders.
