MONOCLONAL-ANTIBODY 14F7, WHICH RECOGNIZES A STAGE-SPECIFIC IMMATURE OLIGODENDROCYTE SURFACE-MOLECULE, INHIBITS OLIGODENDROCYTE DIFFERENTIATION MEDIATED IN CO-CULTURE WITH ASTROCYTES
K. Yoshimura et al., MONOCLONAL-ANTIBODY 14F7, WHICH RECOGNIZES A STAGE-SPECIFIC IMMATURE OLIGODENDROCYTE SURFACE-MOLECULE, INHIBITS OLIGODENDROCYTE DIFFERENTIATION MEDIATED IN CO-CULTURE WITH ASTROCYTES, Journal of neuroscience research, 54(1), 1998, pp. 79-96
Cells at an intermediate stage of oligodendrocyte lineage are not only
well characterized by biochemical studies but also are likely to rela
te to the outcome of physiological events. To elucidate the molecular
events leading to the development of oligodendrocyte lineage cells, we
have raised monoclonal antibodies against stage-specific immature oli
godendrocytes, which have previously been isolated by a novel oligoden
drocyte-lineage cell culture technique (Sakurai et al,: J Neurosci Res
52:17-26, 1998). We have isolated a mouse monoclonal antibody termed
14F7 which predominantly labels stage-specific immature oligodendrocyt
es and have found that the expression of 14F7 immunoreactivity in the
developing neonatal rat forebrain is closely associated with cells exp
ressing the oligodendrocyte progenitor marker A2B5 and to immature oli
godendrocyte expressing O4 antigen. 14F7(+) cells were distributed in
the ventricular and subventricular zone and the nearby forming corpus
callosum as non-myelinating cells. In contrast to cell culture observa
tions, 14F7+ cells were seen only in oligodendrocyte lineage cells. Fo
r instance, dissociated cell culture studies indicated that 14F7 label
s a cell surface molecule, and its cellular distribution is coincident
with all of O4(+) cells and A2B5(+) cells, and even A2B5(-) cells. By
contrast, 14F7-positive cells did not label astrocytes and, furthermo
re, did not label myelin basic protein (MBP)positive oligodendrocytes,
14F7 recognized a 48-kDa protein on sodium dodecyl sulfate polyacryla
mide gel electrophoresis, 14F7 immunoreactivity was detectable in rat
brain as early as embryonic day 18, Furthermore, in these cells, the t
otal time for differentiation was extended, and on maturation, these c
ells subsequently expressed an array of myelin-specific proteins, whic
h normally occurs by direct contact with type-1 astrocytes, However, i
n the presence of 14F7, stage-specific oligodendrocytes co-cultured wi
th astrocytes completely failed to express MBP, These data suggest tha
t the 14F7 antigen is a novel cell surface molecule that is expressed
in the intermediate stage of oligodendrocyte-lineage cells, and it is
expected that it regulates the differentiation of oligodendrocyte thro
ughout development. J, Neurosci, Res. 54:79-96, 1998, (C) 1998 Wiley-L
iss, Inc.