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• W2055368049 abstract "In Brief Objective To compare the mRNA expression of vascular endothelial growth factor (VEGF) 121 and 165 isoforms and thrombospondin-1 (TSP-1) after incubation with tibolone and tibolone metabolites 3α-hydroxytibolone, 3β-hydroxytibolone, Δ4-tibolone, and 17β-estradiol (E2) in cultured Ishikawa cells. Design Ishikawa cells (immortalized from a well-differentiated human adenocarcinoma cell line) were cultured in vitro to confluence. Tibolone, 3α-hydroxytibolone, 3β-hydroxytibolone, Δ4-tibolone and E2 at concentrations of 1.0, 0.1 and 0.01 μmol/L were added to confluent cells and further cultured for an additional 24 h. Control cells were treated with medium in absence of hormone. Total RNA was extracted from control and treated Ishikawa cells. After reverse transcription, VEGF, TSP-1 and the housekeeping gene, β-actin cDNAs, were amplified in a polymerase chain reaction spiked with 33p-dCTP. Relative abundance of VEGF 121 and 165 isoforms and TSP-1 mRNA was measured by scintillation spectroscopy. Results E2, tibolone, 3α-hydroxytibolone, and 3β-hydroxytibolone increased both VEGF 121 and 165 mRNA compared with the control. However, Δ4-tibolone had no effect on either VEGF 121 or 165 mRNA compared with the control. Δ4-Tibolone increased TSP-1 mRNA expression compared with control levels. E2, tibolone, 3α-hydroxytibolone, and 3β-hydroxytibolone did not increase TSP-1 mRNA expression at any concentration. Conclusions Tibolone and the 3α- and 3β-tibolone metabolites with E2 increased VEGF 121 and 165 isoforms. Conversely, Δ4-tibolone, which is reported to have progestational-like activity, did not stimulate VEGF 121 and VEGF 165 but increased TSP-1 mRNA synthesis in cultured Ishikawa cells. We hypothesize, based on these data, that the clinical finding of no endometrial growth in women using tibolone may be partly related to alterations in these angiogenic factors. Tibolone and its two estrogenic metabolites increased VEGF isoforms 121 and 165 in Ishikawa cells. The progestational delta-4 metabolite of tibolone increased thrombspondin-1 mRNA." @default.
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• W2055368049 title "Effect of tibolone and its metabolites on vascular endothelial growth factor isoforms 121 and 165 and thrombospondin-1 mRNA in Ishikawa cells" @default.
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• W2055368049 doi "https://doi.org/10.1097/01.gme.0000074101.35126.7a" @default.
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