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The Journal of Neuroscience, April 1, 2002, 22(7):2478-2486
The Toll-Like Receptor TLR4 Is Necessary for
Lipopolysaccharide-Induced Oligodendrocyte Injury in the CNS
Seija
Lehnardt1, *,
Christian
Lachance1, *,
Silvia
Patrizi1, *,
Sharon
Lefebvre1,
Pamela L.
Follett2,
Frances E.
Jensen2,
Paul A.
Rosenberg2,
Joseph J.
Volpe2, and
Timothy
Vartanian1
1 Department of Neurology, Beth Israel Deaconess
Medical Center, Boston, Massachusetts 02115, 2 Department of Neurology, Children's Hospital, and
Program in Neuroscience, Harvard Medical School, Boston, Massachusetts
02115
The immediate or innate immune response is the first line of
defense against diverse microbial pathogens and requires the expression
of recently discovered toll-like receptors (TLRs). TLR4 serves as a
specific receptor for lipopolysaccharide (LPS) and is localized
on the surface of a subset of mammalian cells. Although innate immunity
is a necessary host defense against microbial pathogens, the
consequences of its activation in the CNS can be deleterious, as we
show here in a developing neural model. We examined the major
non-neuronal cell types in the CNS for expression of TLR4 and found
that microglia expressed high levels, whereas astrocytes and
oligodendrocytes expressed none. Consistent with TLR4 expression solely
in microglia, we show that microglia are the only CNS glial cells that
bind fluorescently tagged lipopolysaccharide. Lipopolysaccharide led to
extensive oligodendrocyte death in culture only under conditions in
which microglia were present. To determine whether TLR4 is necessary
for lipopolysaccharide-induced oligodendrocyte death in mixed glial
cultures, we studied cultures generated from mice bearing a
loss-of-function mutation in the tlr4 gene.
Lipopolysaccharide failed to induce oligodendrocyte death in such
cultures, in contrast to the death induced in cultures from wild-type
mice. Finally, stereotactic intracerebral injection of
lipopolysaccharide into the developing pericallosal white matter of
immature rodents resulted in loss of oligodendrocytes and
hypomyelination and periventricular cysts. Our data provide a general
mechanistic link between (1) lipopolysaccharide and similar microbial
molecular motifs and (2) injury to oligodendrocytes and myelin as
occurs in periventricular leukomalacia and multiple sclerosis.
Key words:
myelination; glia; macrophage; regeneration; degeneration; demyelinating disease
*
S.L., C.L., and S.P. contributed equally to this work.
Copyright © 2002 Society for Neuroscience 0270-6474/02/2272478-09$05.00/0
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