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Evidence-Based Revised View of the Pathophysiology of Preeclampsia

  • Chapter
Book cover Hypertension: from basic research to clinical practice

Part of the book series: Advances in Experimental Medicine and Biology ((AIM,volume 956))

Abstract

Preeclampsia is a life-threatening vascular disorder of pregnancy due to a failing stressed placenta. Millions of women risk death to give birth each year and globally each year, almost 300,000 lose their life in this process and over 500,000 babies die as a consequence of preeclampsia. Despite decades of research, we lack pharmacological agents to treat it. Maternal endothelial oxidative stress is a central phenomenon responsible for the preeclampsia phenotype of high maternal blood pressure and proteinuria. In 1997, it was proposed that preeclampsia arises due to the loss of VEGF activity, possibly due to elevation in anti-angiogenic factor, soluble Flt-1 (sFlt-1). Researchers showed that high sFlt-1 and soluble endoglin (sEng) elicit the severe preeclampsia phenotype in pregnant rodents. We demonstrated that heme oxygenase-1 (HO-1)/carbon monoxide (CO) pathway prevents placental stress and suppresses sFlt-1 and sEng release. Likewise, hydrogen sulphide (H2S)/cystathionine-γ-lyase (Cth) systems limit sFlt-1 and sEng and protect against the preeclampsia phenotype in mice. Importantly, H2S restores placental vasculature, and in doing so improves lagging fetal growth. These molecules act as the inhibitor systems in pregnancy and when they fail, preeclampsia is triggered. In this review, we discuss what are the hypotheses and models for the pathophysiology of preeclampsia on the basis of Bradford Hill causation criteria for disease causation and how further in vivo experimentation is needed to establish ‘proof of principle’. Hypotheses that fail to meet the Bradford Hill causation criteria include abnormal spiral artery remodelling and inflammation and should be considered associated or consequential to the disorder. In contrast, the protection against cellular stress hypothesis that states that the protective pathways mitigate cellular stress by limiting elevation of anti-angiogenic factors or oxidative stress and the subsequent clinical signs of preeclampsia appear to fulfil most of Bradford Hill causation criteria. Identifying the candidates on the roadmap to this pathway is essential in developing diagnostics and therapeutics to target the pathogenesis of preeclampsia.

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  1. Aston Medical Research Institute, Aston Medical School, Aston University, Birmingham, B4 7ET, UK

    Asif Ahmed, Homira Rezai & Sophie Broadway-Stringer

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  1. Asif Ahmed
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  2. Homira Rezai
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  1. Department of Clinical Science and Education Södersjukhuset, Karolinska Institutet, Stockholm, Sweden

    Md. Shahidul Islam

  2. Department of Internal Medicine and Emergency Medicine, Uppsala University Hospital, Uppsala, Sweden

    Md. Shahidul Islam

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Ahmed, A., Rezai, H., Broadway-Stringer, S. (2016). Evidence-Based Revised View of the Pathophysiology of Preeclampsia. In: Islam, M.S. (eds) Hypertension: from basic research to clinical practice. Advances in Experimental Medicine and Biology(), vol 956. Springer, Cham. https://doi.org/10.1007/5584_2016_168

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  • DOI: https://doi.org/10.1007/5584_2016_168

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