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Glial progenitor cells in normal and pathological states
1Department of Physiology and Neurobiology, University of Connecticut, Storrs, USA. nishiyama@oracle.pnb.uconn.edu
The Keio Journal of Medicine
|January 13, 1999
Summary
In the jimpy mouse model, glial progenitor cells (NG2+) show increased proliferation. The chemokine GRO alpha is significantly elevated, potentially driving this proliferation in dysmyelination.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Glial progenitor cells express NG2 proteoglycan and platelet-derived growth factor alpha receptor (PDGF alpha R).
- These markers are present on oligodendrocyte progenitor cells in vitro and in mature brain tissue in vivo.
- NG2+ cells differentiate into oligodendrocytes during development.
Purpose of the Study:
- Investigate changes in NG2+/PDGF alpha R+ cells in the jimpy mouse model of dysmyelination.
- Identify molecular signals responsible for oligodendrocyte progenitor cell proliferation in this model.
Main Methods:
- Utilized antibodies against NG2 proteoglycan and PDGF alpha R to identify glial progenitor cells.
- Administered bromodeoxyuridine to assess cell proliferation in vivo.
- Analyzed mRNA levels of various cytokines in jimpy and wild-type mice spinal cords.
Main Results:
- Jimpy mice exhibited a three- to six-fold increase in bromodeoxyuridine-labeled NG2+ glial cells compared to wild-type.
- Levels of PDGF A and TGF-beta mRNA remained unchanged.
- A significant increase in GRO alpha chemokine mRNA was observed in jimpy spinal cords.
Conclusions:
- The jimpy mutation leads to increased proliferation of NG2+ glial progenitor cells.
- Elevated levels of GRO alpha in the jimpy spinal cord may stimulate oligodendrocyte progenitor cell proliferation.
- Further research is needed to confirm GRO alpha's direct role in stimulating glial progenitor cell proliferation.