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2016 ; 25
(2
): 64-74
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Induction of Nerve Injury-Induced Protein 1 (Ninjurin 1) in Myeloid Cells in Rat
Brain after Transient Focal Cerebral Ischemia
#MMPMID27122992
Lee HK
; Lee H
; Luo L
; Lee JK
Exp Neurobiol
2016[Apr]; 25
(2
): 64-74
PMID27122992
show ga
Nerve injury-induced protein-1 (Ninjurin-1, Ninj1) was initially identified as a
novel adhesion molecule in rat sciatic nerve and to be up-regulated in neurons
and Schwann cells of distal nerve segments after nerve transection or crush
injury. Recently, Ninj1 was found to act as a modulator of cell migration,
angiogenesis, and apoptosis. Accumulating evidence indicates that innate immune
response plays beneficial and deleterious roles in brain ischemia, and the
trans-endothelial migration of blood-derived immune cells is key initiator of
this response. In the present study, we examined the expression profile and
cellular distribution of Ninj1 in rat brain after transient focal cerebral
ischemia. Ninj1 expression was found to be significantly induced in cortical
penumbras 1 day after 60 min of middle cerebral artery occlusion (MCAO) and to
increase gradually for 8 days and then declined. In infarction cores of cortices,
patterns of Ninj1 expression were similar to those observed in cortical
penumbras, except induction was maintained for 10 days. At 1 day post-MCAO, Ninj1
inductions were detected mainly in neutrophils and endothelial cells in both
infarction cores and penumbras, but reactive macrophages were the major cellular
expressers of Ninj1 at 4 days post-MCAO. Expressional induction in reactive
macrophages was maintained in infarction cores after 12 days post-MCAO but not in
penumbras. These dynamic expressions of Ninj1 in different immune cells at
different times suggest that this protein performs various, critical roles in the
modulation of acute and delayed immune responses in the postischemic brain.