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2015 ; 15
(ä): 219
Nephropedia Template TP
gab.com Text
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English Wikipedia
"Microglial nodules" and "newly forming lesions" may be a Janus face of early MS
lesions; implications from virus-induced demyelination, the Inside-Out model
#MMPMID26499989
Sato F
; Martinez NE
; Stewart EC
; Omura S
; Alexander JS
; Tsunoda I
BMC Neurol
2015[Oct]; 15
(ä): 219
PMID26499989
show ga
BACKGROUND: Although the precise mechanism of initial lesion development in
multiple sclerosis (MS) remains unclear, two different neuropathological findings
have been reported as a potential early pathology of MS: "microglial nodules" and
"newly forming lesions", both of which contain neither T cell infiltration nor
demyelination. In microglial nodules, damaged axons were associated with a small
number of aggregated macrophages/microglia, while oligodendrocyte apoptosis was a
characteristic in newly forming lesions. However, is the presence of "microglial
nodules" and "oligodendrogliopathy" mutually exclusive? Might these two different
observations be the same neuropathology (as proposed by the concept, "preactive
lesions"), but interpreted differently based on the different theories of early
MS lesion development, using different staining methods? DISCUSSION: Since two
studies are looking at two distinct aspects of early MS pathogenesis (one focused
on axons and the other on oligodendrocytes), in a sense, one can say that these
two studies are complementary. On the other hand, experimentally, Wallerian
degeneration (WD) has been demonstrated to induce both microglial nodules and
oligodendrocyte apoptosis in the central nervous system (CNS). Here, when
encephalitogenic T cells are present in the periphery in both autoimmune and
viral models of MS, induction of WD in the CNS has been shown to result in the
recruitment of T cells along the degenerated tract, leading to demyelination
(Inside-Out model). These experimental findings are consistent with early MS
pathology described by both "microglial nodules" and "newly forming lesions".
CONCLUSIONS: The differences between the two neuropathological findings may be
based on the preference of staining methods, where one group observed axonal and
microglial pathology and the other observed oligodendrocyte apoptosis; a Janus
face that is looked at from the two different sides.