Rapid Diminution in the Level and Activity of DNA-Dependent Protein Kinase in Cancer Cells by a Reactive Nitro-Benzoxadiazole Compound

被引:11
作者
Silva, Viviane A. O. [1 ]
Lafont, Florian [1 ]
Benhelli-Mokrani, Houda [1 ]
Le Breton, Magali [1 ]
Hulin, Philippe [2 ]
Chabot, Thomas [1 ]
Paris, Francois [3 ]
Sakanyan, Vehary [4 ,5 ]
Fleury, Fabrice [1 ]
机构
[1] Univ Nantes, Fac Sci & Tech, Mech & Regulat DNA Repair Team, UFIP CNRS UMR 6286, 2 Rue Houssinere, F-44322 Nantes, France
[2] CNRS, INSERM, Plate Forme MicroPICell SFR Sante F Bonamy FED 42, UMS3556,UMS016, F-44007 Nantes, France
[3] CNRS, Inserm 6299, UMR 892, Team 14, F-44007 Nantes, France
[4] Univ Nantes, Fac Sci & Tech, Fac Pharm, IICiMed EA 1155, 2 Rue Houssiniere, F-44322 Nantes, France
[5] ProtNeteomix, 29 Rue Provence, F-44700 Orvault, France
关键词
DNA-PKcs; DNA repair; hydrogen peroxide; SOD1; nitro-benzoxadiazole; chemiosensitization; protein targeting; prostate cancer; GROWTH-FACTOR RECEPTOR; STRAND BREAK REPAIR; CATALYTIC SUBUNIT; NUCLEAR IMPORT; PK; AUTOPHOSPHORYLATION; EGFR; ACTIVATION; PATHWAY; DAMAGE;
D O I
10.3390/ijms17050703
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The expression and activity of DNA-dependent protein kinase (DNA-PK) is related to DNA repair status in the response of cells to exogenous and endogenous factors. Recent studies indicate that Epidermal Growth Factor Receptor (EGFR) is involved in modulating DNA-PK. It has been shown that a compound 4-nitro-7-[(1-oxidopyridin-2-yl) sulfanyl]-2,1,3-benzoxadiazole (NSC), bearing a nitro-benzoxadiazole (NBD) scaffold, enhances tyrosine phosphorylation of EGFR and triggers downstream signaling pathways. Here, we studied the behavior of DNA-PK and other DNA repair proteins in prostate cancer cells exposed to compound NSC. We showed that both the expression and activity of DNA-PKcs (catalytic subunit of DNA-PK) rapidly decreased upon exposure of cells to the compound. The decline in DNA-PKcs was associated with enhanced protein ubiquitination, indicating the activation of cellular proteasome. However, pretreatment of cells with thioglycerol abolished the action of compound NSC and restored the level of DNA-PKcs. Moreover, the decreased level of DNA-PKcs was associated with the production of intracellular hydrogen peroxide by stable dimeric forms of Cu/Zn SOD1 induced by NSC. Our findings indicate that reactive oxygen species and electrophilic intermediates, generated and accumulated during the redox transformation of NBD compounds, are primarily responsible for the rapid modulation of DNA-PKcs functions in cancer cells.
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页数:16
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