Proteomická analýza leukemických buněčných linií po ozáření

Šalovská, Barbora

(ENG) Title of the dissertation: Proteomic analysis of gamma-irradiated human leukemic cells In the presented doctoral thesis, we aimed to elucidate molecular mechanisms underlying radiosensitization of MOLT-4 cell line (T-ALL) by specific inhibition of kinases from the phosphatidylinositol-3 kinase-related kinases (PIKKs) family. We tested two highly potent inhibitors of ATR and ATM, VE-821 and KU55933, respectively, for their effects on proliferation, viability, and cell cycle of sham-irradiated and irradiated MOLT-4 cells. Both inhibitors proved to radiosensitize MOLT-4 cells and furthermore, 10 µM VE-821 was shown to act as a strong antiproliferative agent in sham-irradiated MOLT-4 cells. To further describe cellular mechanisms underlying the VE-821-mediated radiosensitization of MOLT-4 cells, we employed high-resolution mass spectrometry to identify and quantify changes in proteome and phosphoproteome of irradiated VE-821-treated cells. As the detection and quantification of phosphorylated peptides in complex biological samples is challenging due to their low stoichiometry, we first compiled and optimized protocol for their enrichment. The protocol was then applied to study changes in radiosensitized MOLT-4 cells. In concordance with our expectations, VE-821 did not cause any significant...

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