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2015 ; 8
(7
): 7849-58
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Myelin ultrastructure of sciatic nerve in rat experimental autoimmune neuritis
model and its correlation with associated protein expression
#MMPMID26339349
Yuan XJ
; Wei YJ
; Ao Q
; Gong K
; Wang JY
; Sun QS
; Zhang L
; Zheng ZC
; Chen L
Int J Clin Exp Pathol
2015[]; 8
(7
): 7849-58
PMID26339349
show ga
To explore the relationship of peripheral nerve ultrastructure and its associated
protein expression in experimental autoimmune neuritis (EAN). EAN was established
in Lewis rats using an emulsified mixture of P0 peptide 180-199, Mycobacterium
tuberculosis, and incomplete Freund's adjuvant. Rats immunized with saline
solution were used as a control group. Sciatic nerve ultrastructure and
immunofluorescence histopathology were measured at the neuromuscular severity
peak on day 18 post-induction. Cell-specific protein markers were used for
immunofluorescence histopathology staining to characterize sciatic nerve cells:
CD3 (T cell), Iba-1 (microglia), S100 (myelin), and neurofilament 200 (axon). The
results showed that swelling of the myelin lamellae, vesicular disorganization,
separation of the myelin lamellae, and an attenuation or disappearance of the
axon were observed by transmission electron microscopy in the EAN group. CD3 and
Iba-1 increased significantly in the structures characterized by separation or
swelling of the myelin lamellae, and increased slightly in the structures
characterized by vesicular of the myelin lamellae, S100 decreased in the
structures characterized by vesicular disorganization or separation of the myelin
lamellae. And neurofilament 200 decreased in the structures characterized by
separation of the myelin lamellae. Furthermore, we found that Iba1 were positive
in the myelin sheath, and overlapped with S100, which significantly indicated
that Schwann cells played as macrophage-like cells during the disease progression
of ENA. Our findings may be a significant supplement for the knowledge of EAN
model, and may offer a novel sight on the treatment of Guillain-Barré syndrome.