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of the tumour volume

of the tumour volume. relationship between rapidly growing cells and sFLT1 overexpression, we have focused here on the effect of sFLT1 on highly proliferative tumour cells. Vascular Endothelial Growth Factor (VEGF) and its soluble receptors are associated with endothelial dysfunction, vascular remodelling, and endothelial repair and regeneration mechanisms2,5,6,7. Soluble FLT1 is produced by a variety of tissues such as the placenta, endothelial cells and peripheral blood mononuclear cells8,9,10. Recently, several studies have demonstrated proliferative suppression by sFLT1 which caused apoptosis in an endothelial cell line11 and suppressed vascular development in the labyrinthine layer in a preeclampsia mouse model4. Moreover, systemic administration of AdV-led to reduced tumour growth, tumour vascularity, and ascites formation in ovarian cancer xenografts12,13. A monoclonal antibody to VEGF, bevacizumab, is now clinically used as an antiangiogenic therapeutic for ovarian cancer, colorectal cancer and others14,15,16. To the best of our knowledge, there is no literature clarifying the direct mechanism of cell injury by sFLT1. Previous reports11,12,13 have examined the secondary effects of anti-angiogenesis by sFLT1 into cells, and 2) exogenous administration of rVEGFR1 to culture media of four cell lines (HEK293T, SKOV3, HeyA8 and HT-29). Finally, we investigated the anti-tumour effect of exogenous rVEGFR1, endogenous sFLT1, and bevacizumab using mice transplanted with SKOV3 cells. Results Cell growth is restricted by sFLT1 To evaluate the effect of endogenous sFLT1 on cell proliferation, pLV-or pLV-was transfected into the previously stated cell lines. We measured sFLT1 concentrations in the resulting culture media. These corresponded to the concentrations observed in women with preeclampsia or in normal pregnant women. pLV-was used as a control (Supplementary Table S1). Cell numbers were counted after transfection and did not differ significantly between the two groups 48?hours after passage, but following an additional 24 or 48?hours, there were significantly fewer cells in the sFLT1 treated group (P?DW-1350 a significant increase (Fig. 2b). Open in a separate window Figure 2 Both transfected and exogenously applied sFLT1 has cytotoxic activity.(a) Comparison of the LDH leakage assays after transfection with pLV-or pLV-groups, the levels of LDH release were restored to near those of the pLV-groups. Data are presented as a percentage DW-1350 of the control. Rabbit Polyclonal to EIF2B3 *P?