Evidence for the presence of the sphingosine-1-phosphate receptor Edg-8 in human radial glial fibers.
The distribution pattern of Edg-8 immunostaining in the human developing brain has been investigated with special reference to radial glial fibers. At 24 weeks of gestation, fragments of radial glial fibers are Edg-8-positive within the cortical plate and subplate of allocortical areas. These Edg-8-positive fragments often appear enlarged as varicosities and some of them terminate at blood vessels. Between 28 and 30 weeks of gestation, all iso- and allocortical areas contain Edg-8-immunolabelled radial glial fibers revealing curvature next to sulci. After 32 weeks of gestation, radial glial fibers gradually disappear; instead Edg-8-positive transitional stages between radial glia and astrocytes were found. The findings indicate that sphingosine-1-phosphate may play a regulatory role in the transformation of radial glial cells into astrocytes and may affect proliferative activity of these cells.
Ulfig
Norbert
N
Department of Anatomy, Neuroembryonic Research Laboratory, University of Rostock, Gertrudenstrasse 9, D-18055 Rostock, Germany. norbert.ulfig@med.uni-rostock.de
Briese
Michael
M
D001253:Astrocytes / Q000166:cytology / Q000378:metabolism*; D015415:Biomarkers / Q000378:metabolism; D001921:Brain / Q000196:embryology / Q000378:metabolism*; D005865:Gestational Age; D006801:Humans; D007124:Immunoenzyme Techniques; D049349:Receptors, Lysosphingolipid / Q000378:metabolism*; D013194:Staining and Labeling; D014746:Vimentin / Q000378:metabolism
D015415:Biomarkers; D049349:Receptors, Lysosphingolipid; D014746:Vimentin