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Objective: To evaluate the effect of magnesium sulfate (MgSO(4)) on placental expression levels of vascular endothelial growth factor (VEGF)., Materials and Methods: Cotyledons of term normotensive and preeclamptic placentas were dually perfused for 6 h, with MgSO(4) (6-7 mg%) in the maternal reservoir [normotensive (n = 3); preeclamptic (n = 4)] and with the control medium (without MgSO(4)) [normotensive (n = 3); preeclamptic (n = 6)]. After perfusion, placental tissue samples were collected from four different placental compartments (amnion, chorion, placental villous and decidua). The collected placental tissues were homogenized and examined for VEGF by ELISA. Statistical significance was determined using a two-way analysis of variance., Results: After perfusion with control medium, significantly lower levels of VEGF were detected in the chorion and placental villous compartments of preeclamptic placentas (70 ± 24 pg/g protein and 29 ± 11 pg/g protein; respectively), as compared with normotensive placentas (172 ± 80 pg/g protein and 51 ± 17 pg/g protein; respectively; p < 0.05). Exposure of preeclamptic placentas to MgSO(4) resulted in decreased VEGF levels by the amnion (57 ± 26 pg/g protein), as compared with the control group (153 ± 62 pg/g protein) (p < 0.05). On the other hand, MgSO(4) significantly increased VEGF levels by the placental villous and the decidua (58 ± 15 pg/g protein, 70 ± 29 pg/g protein; respectively), as compared with the control group (29 ± 11 pg/g protein, 33 ± 14 pg/g protein; respectively) (p < 0.01, p < 0.05; respectively). Exposure to MgSO(4) did not affect VEGF levels in normotensive placentas., Conclusion: Reduced levels of VEGF are expressed by some placental compartments in preeclampsia compared with normotensive pregnancy. Perfusion with MgSO(4) affects VEGF expression differently by preeclamptic and normotensive placentas. Increased production of placental VEGF in preeclampsia may play a role in the therapeutic action of MgSO(4).

Objective: To examine the effect of magnesium sulfate (MgSO(4)) on sFlt (soluble fms-like tyrosine kinase)-1 in the fetal and maternal compartments of normotensive and preeclamptic placentas., Methods: Cotyledons of term normotensive and preeclamptic placentas were dually perfused for six hours, with control medium and MgSO(4) (6-7 mg %) in the maternal reservoir. Perfusate sFlt-1 concentrations were measured., Results: Median sFlt-1 concentration was higher in the maternal than in the fetal side in both groups and perfusion media (p < 0.0001). When perfused with control medium, the maternal side median sFlt-1 concentration was higher in the preeclampsia than in the control group (p < 0.0001). After perfusion with MgSO(4), the median maternal and fetal sides perfusate sFlt-1 concentration were higher in the preeclampsia than in the control group (p < 0.0001). In comparison to perfusion with control medium, the median sFlt-1 concentration of normal pregnant women decreased in the fetal and increased in the maternal side. In the preeclampsia group, only median fetal side sFlt-1 concentration increased., Conclusion: In contrast to normal pregnant women, perfusion with MgSO(4) of preeclamptic placentas did not increase their sFlt-1 concentration. This may indicate that MgSO(4) role may be limited to its anti-eclamptic and does not affect the anti-angiogenic state associated with preeclampsia.