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2018 ; 24
(ä): 1863-1870
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Hypertonic Saline Alleviates Brain Edema After Traumatic Brain Injury via
Downregulation of Aquaporin 4 in Rats
#MMPMID29600800
Yin J
; Zhang H
; Chen H
; Lv Q
; Jin X
Med Sci Monit
2018[Mar]; 24
(ä): 1863-1870
PMID29600800
show ga
BACKGROUND Hypertonic saline (HS) has been successfully used for treatment of
various forms of brain edema. Decreased expression of aquaporin (AQP)4 and
pro-inflammatory cytokines such as tumor necrosis factor (TNF)-a and interleukin
(IL)-1b have been linked to edema pathogenesis. This study examined the effect of
3% HS on brain edema in a rat model of traumatic brain injury (TBI). MATERIAL AND
METHODS Sprague-Dawley rats were subjected to TBI induced by a controlled
cortical impactor. The HS group was injected with 3% NaCl until the end of the
study period. AQP4, TNF-?, IL-1?, and caspase-3 levels were measured by Western
blotting, immunohistochemistry, enzyme-linked immunosorbent assay, and
quantitative real-time PCR. Brain water content was also measured. Apoptotic
cells in brain tissue were detected with terminal deoxynucleotidyl transferase
dUTP nick-end labeling. Brain water content decreased following treatment with 3%
HS relative to the TBI group. RESULTS This was accompanied by decreases in AQP4,
TNF-?, and IL-1? mRNA and protein levels. TBI resulted in increases in caspase-3
mRNA expression and the number of apoptotic cells; treatment with 3% HS
suppressed apoptosis as compared to the TBI group. CONCLUSIONS Treatment with 3%
HS ameliorated TBI-induced brain edema, possibly by suppressing brain edema,
pro-inflammatory cytokine expression, and apoptosis.