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- W972617295 abstract "To analyze the causative mechanisms in refractory leukemia cells.Vascular endothelial growth factor (VEGF) blood plasma concentrations in 35 de novo, 6 relapse, 20 remission leukemia patients and 10 healthy kids were determined via ELISA analyses. Transcription levels of the VEGF receptors (VEGFR) Fms-like tyrosine kinase-1 (Flt-1) and kinase-domain insert containing receptor (KDR) were determined in participants' leucocytes with RT-PCR. Apoptosis rates as well as Cyt-C and Caspase-3 expression was determined in Jurkat, Jurkat(Bcl-2), healthy and recurrent leukemia leukocytes with and without VP-16 applications via flow cytometry. Total Akt (t-Akt) expression and its phosphorylation (p-AKT) status in leukocytes of the participants were analyzed with western blots.Healthy children and the remission group had the lowest blood plasma VEGF concentrations (91.16±41.34 vs. 135.80±111.28 pg/ml), followed by de novo leukemia patients (362.49±195.68 pg/ml-494.19±186.23 pg/ml) and relapse patients (574.37±278.45 pg/ml) (P<0.01). The same trend was statistically significant visible for Flt-1 and KDR expressions in leukocytes of the participants. Stable Bcl-2 overexpression led to reduced apoptosis rates as well as Cyt-C and Caspase-3 expressions in Jurkat cells after VP-16 application, which was similar in leucocytes of remission patients. In contrast to no phosphorylation in healthy children, Akt was phosphorylated in 10% remission samples, 30% de novo leukemia samples and in 67% of recurrent leukemia leucocytes.High VEGF plus VEGFR expression and AKT phosphorylation are highest in leukocytes of remission patients, suggesting VEGF signaling as a cause of reduced apoptosis susceptibility upon treatments." @default.
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- W972617295 date "2015-01-01" @default.
- W972617295 modified "2023-09-25" @default.
- W972617295 title "Up-regulation of VEGF and its receptor in refractory leukemia cells." @default.
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