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2016 ; 10
(ä): 561
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Magnesium Sulfate Prevents Placental Ischemia-Induced Increases in Brain Water
Content and Cerebrospinal Fluid Cytokines in Pregnant Rats
#MMPMID28008305
Zhang LW
; Warrington JP
Front Neurosci
2016[]; 10
(ä): 561
PMID28008305
show ga
Magnesium sulfate (MgSO(4)) is the most widely used therapy in the clinic to
prevent the progression of preeclampsia, a hypertensive disorder of pregnancy, to
eclampsia. Eclampsia, manifested as unexplained seizures and/or coma during
pregnancy or postpartum, accounts for ~13% of maternal deaths worldwide. While
MgSO(4) continues to be used in the clinic, the mechanisms by which it exerts its
protective actions are not well understood. In this study, we tested the
hypothesis that MgSO(4) protects against placental ischemia-induced increases in
brain water content and cerebrospinal fluid cytokines. To test this hypothesis,
MgSO(4) was administered via mini-osmotic pump (60 mg/day, i.p.) to pregnant and
placental ischemic rats, induced by mechanical reduction of uterine perfusion
pressure, from gestational day 14-19. This treatment regimen of MgSO(4) led to
therapeutic level of 2.8 ± 0.6 mmol/L Mg in plasma. MgSO(4) had no effect on
improving placental ischemia-induced changes in mean arterial pressure, number of
live fetuses, or fetal and placental weight. Placental ischemia increased, while
MgSO(4) prevented the increase in water content in the anterior cerebrum.
Cytokine and chemokine levels were measured in the cerebrospinal fluid using a
multi-plex assay. Results demonstrate that cerebrospinal fluid, obtained via the
cisterna magna, had reduced protein, albumin, interleukin (IL)-17A, IL-18, IL-2,
eotaxin, fractalkine, interferon gamma, vascular endothelial growth factor
(VEGF), and macrophage inflammatory protein (MIP)-2 following MgSO(4) treatment.
These data support the hypothesis that MgSO(4) offers neuroprotection by
preventing placental ischemia-induced cerebral edema and reducing levels of
cytokines/chemokines in the cerebrospinal fluid.