Placental Cytokines and the Pathogenesis of Preeclampsia

American Journal of Reproductive Immunology - Tập 37 Số 3 - Trang 240-249 - 1997
Kirk P. Conrad1, Deborah Fairchild Benyo2
1Magee-Womens Research Institute, Pittsburgh, Pennsylvania, USA
2Magee-Womens Research Institute and Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania

Tóm tắt

The authors explore the hypothesis that tumor necrosis factor‐α (TNF‐α) and possibly other inflammatory cytokines are overproduced by the placenta in response to local ischemia/hypoxia contributing to increased plasma levels, and subsequent endothelial activation and dysfunction in the pregnancy disorder, preeclampsia. It is widely held that inadequate trophoblast invasion and physiologic remodeling of spiral arteries initiate placental ischemia/hypoxia in preeclampsia. Furthermore, focal areas of placental hypoxia have been implicated in the production of “toxic” factor(s) by the placenta, which circulate and cause maternal disease. Placental trophoblast cells and fetoplacental macrophages normally produce TNF‐α and in‐terleukin‐1 (IL‐1), which are capable of producing endothelial cell activation and dysfunction. Hypoxia has recently been reported to increase TNF‐α and IL‐1 production by term villous explants from the human placenta. Placental cells also express erythropoietin (EPO), which is the prototype molecule for transcriptional regulation by hypoxia in mammals. Interestingly, TNF‐α and IL‐1 have DNA sequences homologous or nearly homologous to the hypoxia‐responsive enhancer element of the EPO gene, thus providing a potential, but as of yet, untested molecular link between placental hypoxia and stimulation of cytokine production. Inflammatory cytokines overproduced by the placenta in response to hypoxia may then lead to increased plasma levels and endothelial activation and dysfunction in preeclampsia. The purpose of this short review is to critically evaluate the hypothesis that placental cytokines contribute to the pathogenesis of preeclampsia. Of note, the etiology of the disease presumably related to deficient trophoblast invasion is beyond the scope of this work.

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American Journal of Reproductive Immunology

Tập 37 Số 3

240-249

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