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2015 ; 5
(ä): 9691
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In vivo two-photon imaging of axonal dieback, blood flow, and calcium influx with
methylprednisolone therapy after spinal cord injury
#MMPMID25989524
Tang P
; Zhang Y
; Chen C
; Ji X
; Ju F
; Liu X
; Gan WB
; He Z
; Zhang S
; Li W
; Zhang L
Sci Rep
2015[May]; 5
(ä): 9691
PMID25989524
show ga
Severe spinal cord injury (SCI) can cause neurological dysfunction and paralysis.
However, the early dynamic changes of neurons and their surrounding environment
after SCI are poorly understood. Although methylprednisolone (MP) is currently
the standard therapeutic agent for treating SCI, its efficacy remains
controversial. The purpose of this project was to investigate the early dynamic
changes and MP's efficacy on axonal damage, blood flow, and calcium influx into
axons in a mouse SCI model. YFP H-line and Thy1-GCaMP transgenic mice were used
in this study. Two-photon microscopy was used for imaging of axonal dieback,
blood flow, and calcium influx post-injury. We found that MP treatment attenuated
progressive damage of axons, increased blood flow, and reduced calcium influx
post-injury. Furthermore, microglia/macrophages accumulated in the lesion site
after SCI and expressed the proinflammatory mediators iNOS, MCP-1 and IL-1?. MP
treatment markedly inhibited the accumulation of microglia/macrophages and
reduced the expression of the proinflammatory mediators. MP treatment also
improved the recovery of behavioral function post-injury. These findings suggest
that MP exerts a neuroprotective effect on SCI treatment by attenuating
progressive damage of axons, increasing blood flow, reducing calcium influx, and
inhibiting the accumulation of microglia/macrophages after SCI.