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Journal of Neuroscience, Vol 10, 684-692, Copyright © 1990 by Society for Neuroscience
Cortical radial glia: identification in tissue culture and evidence for their transformation to astrocytes
SM Culican, NL Baumrind, M Yamamoto and AL Pearlman
Department of Cell Biology, Washington University School of Medicine, St. Louis, Missouri 63110.
Radial glia are transiently present in the developing cerebral cortex,
where they are thought to guide the migration of neurons from the
proliferative zone to the forming cortical plate. To provide a framework
for experimental studies of radial glia, we have defined morphological and
immunocytochemical criteria to identify them in primary cultures of
cortical cells obtained at embryonic day 13 in the mouse. Cortical radial
glia in culture for 1-2 d resemble radial glia in vivo: they have a long,
thin, unbranched process extending from one or both ends of the elongated
cell body and are labeled with the monoclonal antibody RC1 but not with
antibodies to glial fibrillary acidic protein (abGFAP). We tested the
specificity of RC1 by double- labeling with a panel of cell-type specific
antibodies, and found that it labels radial glia, astrocytes, and
fibroblast-like cells, but not neurons. Fibroblasts are easily
distinguished from glia by morphology and by labeling with antibodies to
fibronectin. To test the hypothesis that radial glia become astrocytes when
their developmental role is complete, we examined their morphological and
immunocytochemical development in culture. After 3-4 d in vitro radial glia
develop several branched processes; in this transitional stage they are
labeled by both RC1 and abGFAP. Many radial glia lose RC1 immunoreactivity
as they become increasingly branched and immunoreactive to abGFAP. In areas
of the cultures that have few neurons and in cultures depleted of neurons
by washing, flat, nonprocess-bearing glia predominate. These cells do not
lose immunoreactivity to RC1 during the 9-d period of observation even
though they acquire GFAP.(ABSTRACT TRUNCATED AT 250 WORDS)
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