Related Experiment Video
Updated: Aug 6, 2026
06:24
Mouse Models of Periventricular Leukomalacia
Published on: May 18, 2010
Defective oligodendrocyte development and severe hypomyelination in PDGF-A knockout mice
M Fruttiger1, L Karlsson, A C Hall
1MRC Laboratory for Molecular Cell Biology and Department of Biology, University College London, Gower Street, London WC1E 6BT, UK.
Development (Cambridge, England)
|January 7, 1999
Summary
Platelet-derived growth factor A (PDGF-A) is crucial for oligodendrocyte progenitor proliferation and subsequent oligodendrocyte development in the central nervous system (CNS). PDGF-A deficiency leads to reduced progenitor numbers and dysmyelination.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Oligodendrocytes are glial cells responsible for myelin production in the central nervous system (CNS).
- Oligodendrocyte progenitors, specifically O-2A progenitors, express platelet-derived growth factor alpha-receptors (PDGFRα).
- The lineage and developmental origins of all oligodendrocytes, including potential PDGFRα-negative precursors, remain incompletely understood.
Purpose of the Study:
- To investigate the role of platelet-derived growth factor (PDGF) in oligodendrogenesis.
- To determine if PDGF-A signaling is essential for the proliferation of PDGFRα-expressing oligodendrocyte progenitors.
- To examine the impact of PDGF-A deficiency on oligodendrocyte numbers and myelination throughout the CNS.
Main Methods:
- Analysis of mice genetically deficient in PDGF-A or PDGF-B.
- Quantification of PDGFRα-positive oligodendrocyte progenitors and oligodendrocytes in various CNS regions.
- Assessment of the central nervous system for dysmyelination phenotypes.
- Characterization of myelin proteolipid protein (PLP/DM-20)-positive cells in the embryonic brainstem.
Main Results:
- PDGF-A null mice exhibited significantly fewer PDGFRα progenitors compared to wild-type or PDGF-B null mice.
- The proliferation of PDGFRα progenitors is heavily dependent on PDGF-AA homodimers.
- PDGF-A-deficient mice displayed reduced oligodendrocyte numbers and a dysmyelinating phenotype (tremor).
- Reductions in progenitors and oligodendrocytes were more pronounced in the spinal cord and cerebellum than in the medulla.
- PLP/DM-20-positive cells in the embryonic brainstem were identified as non-dividing, likely immature oligodendrocytes, not proliferating precursors.
Conclusions:
- PDGF-A signaling is critical for the proliferation of PDGFRα-expressing oligodendrocyte progenitors.
- A strong correlation exists between PDGFRα progenitors and oligodendrogenesis across most CNS regions.
- PDGF-A deficiency leads to impaired oligodendrocyte development and dysmyelination.
- The study provides evidence for distinct cell populations within the developing oligodendrocyte lineage.
