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Journal of Reproductive Immunology 2005-Dec

Lymphokine-activated killer cells induced from decidual lymphocytes reduce the angiogenic activity of trophoblasts by enhancing the release of soluble fms-like tyrosine kinase-1 from trophoblasts: an implication for the pathophysiology of preeclampsia.

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Kaya Matsubara
Takeshi Nagamatsu
Tomoyuki Fujii
Shiro Kozuma
Yuji Taketani

Słowa kluczowe

Abstrakcyjny

T helper (Th)1 cytokine-predominating status and compromised placental vasculature is thought to be central to the pathogenesis of preeclampsia. However, it remains to be clarified how these two phenomena relate to each other. We have reported that lymphokine-activated killer (LAK) cells induced from decidual mononuclear cells (DMCs) with interleukin (IL)-2 expressed in preeclamptic placenta reduced the angiogenic activity of cytotrophoblasts (CTs). The objective of this study was to examine how LAK cells reduced the angiogenic activity of CTs. We investigated the angiogenesis-related molecules released from cultured CTs obtained from first trimester placenta that had been pretreated with either non-activated DMCs or LAK cells from DMCs. The amounts of vascular endothelial growth factor (VEGF), placenta growth factor (PlGF) and their antagonist, soluble fms-like tyrosine-kinase-1 (sFlt-1) released in CT culture media were measured using ELISA. CTs pretreated with LAK cells released more sFlt-1 compared with those pretreated with non-activated lymphocytes, and CTs pretreated with non-activated lymphocytes released more sFlt-1 compared with those without pretreatment. The release of total VEGF and free PlGF from CTs was not altered by pretreatment with DMCs. Thus, in preeclamptic placenta, LAK cells induced from DMCs by co-existing IL-2 may react to the invading CTs and enhance the release of sFlt-1 from CTs without any change of VEGF or PlGF secretion. This might result in the reduction of actual angiogenic potential of the VEGF system in decidua and the placental vascular system might be compromised, which may lead to the development of preeclampsia.

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