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This study aimed to analyse the expression of Sirt1/FoxO1 pathway in the placenta of patients with preeclampsia (PE). Clinical data of 111 PE patients were retrospectively analysed and divided into mild group ( n  = 61) and severe group ( n  = 50) according to the severity of condition. Another 45 healthy mothers were selected as healthy group. The value of Sirt1/FoxO1 pathway-related proteins in predicting prognosis of PE patients was analysed. The severe group had higher Sirt1 and lower FoxO1 protein expressions than the mild and healthy groups ( p  &lt; 0.05). Sirt1 protein expression was positively correlated with ROS, LHP, NOX4, IL-1β, IL-6, HMGB1, CRP, VCAM-1, Caspase-3, Fas, Apaf-1 and ET-1 in PE patients ( r  &gt; 0,  p  &lt; 0.05), while FoxO1 protein expression was negatively correlated with these indices ( r  &lt; 0,  p  &lt; 0.05). Sirt1 protein expression was negatively correlated with SOD, CAT, GSH-Px, Bcl-2, Mcl-2, P57 kip2  and NO ( r  &lt; 0,  p  &lt; 0.05), while FoxO1 protein expression was positively correlated with these indices ( r  &gt; 0,  p  &lt; 0.05). The expression of Sirt1/FoxO1 pathway related proteins was abnormal in placenta of PE patients, and was closely related to the expression of oxidative stress, inflammatory response, endothelial damage factors and apoptotic molecules.IMPACT STATEMENTWhat is already known on this subject?  The Sirt1/FoxO1 pathway is abnormally expressed in the placenta of preeclampsia patients, with Sirt1 protein expression up-regulated and FoxO1 protein expression down-regulated, both of which are closely related to the expression of oxidative stress, inflammatory response, endothelial damage factors and apoptotic molecules in the placenta of preeclampsia patients.What do the results of this study add?  The results of this study add to the knowledge about the role of the Sirt1/FoxO1 pathway in the pathogenesis of preeclampsia.What are the implications of these findings for clinical practice and/or further research?  These findings provide a basis for predicting poor pregnancy outcomes in patients with preeclampsia in clinical practice. What is already known on this subject?  The Sirt1/FoxO1 pathway is abnormally expressed in the placenta of preeclampsia patients, with Sirt1 protein expression up-regulated and FoxO1 protein expression down-regulated, both of which are closely related to the expression of oxidative stress, inflammatory response, endothelial damage factors and apoptotic molecules in the placenta of preeclampsia patients. What do the results of this study add?  The results of this study add to the knowledge about the role of the Sirt1/FoxO1 pathway in the pathogenesis of preeclampsia. What are the implications of these findings for clinical practice and/or further research?  These findings provide a basis for predicting poor pregnancy outcomes in patients with preeclampsia in clinical practice.

The expression of Sirt1/FoxO1 pathway in the placenta of patients with preeclampsia and its connection with prognosis