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The soluble fms-like tyrosine kinase 1 (sFlt-1), known to be increased in the serum of preeclamptic patients, is a relevant factor in causing maternal symptoms like hypertension and proteinuria. In this study, we aimed to reveal whether hypoxia is a cause of increased sFlt-1 levels and inflammation markers in vivo and whether these symptoms can be attenuated by interleukin 6 (IL-6) depletion. For this purpose, pregnant wild-type (wt) mice or IL-6(-/-) mice on embryonic day 16 were placed under either normoxic (20.9% oxygen) or hypoxic (6% oxygen) conditions for 6 hours. This led to a rise of sFlt-1 levels in maternal serum, independent of the IL-6 status of the dam. Increased maternal sFlt-1 serum levels were, however, not due to an increase in sFlt-1 messenger RNA levels in the placenta. Moreover, there was no increase in inflammatory markers in neither wt mice nor IL-6(-/-) mice. This suggests that hypoxia alone does not contribute to the induction of an inflammatory placenta. Also, the hypoxia-induced rise in sFlt-1 levels seems not to be mediated by IL-6 in vivo.

Hypoxia-Mediated Soluble Fms-Like Tyrosine Kinase 1 Increase Is Not Attenuated in Interleukin 6-Deficient Mice