Trans,trans,trans-[PtIV(N3)2(OH)2(py)(NH3)]: A Light-Activated Antitumor Platinum Complex That Kills Human Cancer Cells by an Apoptosis-Independent Mechanism
| العنوان: | Trans,trans,trans-[PtIV(N3)2(OH)2(py)(NH3)]: A Light-Activated Antitumor Platinum Complex That Kills Human Cancer Cells by an Apoptosis-Independent Mechanism |
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| المؤلفون: | Kim S. Robinson, Luca Salassa, Virginia Appleyard, Karen Murray, Katharina Korpis, Aron F. Westendorf, Nicola J. Farrer, Renate Grünert, Peter J. Sadler, Julie A. Woods, Alastair M. Thompson, Patrick J. Bednarski |
| المصدر: | Molecular Cancer Therapeutics |
| بيانات النشر: | American Association for Cancer Research (AACR), 2012. |
| سنة النشر: | 2012 |
| مصطلحات موضوعية: | Cancer Research, Programmed cell death, Organoplatinum Compounds, Cell Survival, Ultraviolet Rays, Mice, Nude, Antineoplastic Agents, Apoptosis, HL-60 Cells, 010402 general chemistry, 01 natural sciences, Article, Inhibitory Concentration 50, Mice, chemistry.chemical_compound, Annexin, Autophagy, medicine, Animals, Humans, Cytotoxic T cell, Propidium iodide, Clonogenic assay, Cell Shape, Cisplatin, 010405 organic chemistry, Cell Cycle, Photochemical Processes, Xenograft Model Antitumor Assays, 0104 chemical sciences, Oncology, chemistry, Drug Resistance, Neoplasm, Cell culture, Immunology, Biophysics, Female, medicine.drug |
| الوصف: | Photoactivatable PtIV diazido complexes have unusual photobiologic properties. We show here that trans,trans,trans-[PtIV(N3)2(OH)2(py)(NH3)] complex 3 is a potent photoactivated cytotoxin toward human cancer cells in culture, with an average IC50 value in 13 cell lines of 55 ± 28 μmol/L after 30 minutes (0.12 mW/cm2) photoactivation with UVA, although visible light was also effective. Photoactivated complex 3 was noncross-resistant to cisplatin in 3 of 4 resistant cell lines. Cell swelling but very little blebbing was seen for HL60 cells treated with irradiated complex 3. Unlike cisplatin and etoposide, both of which cause apoptosis in HL60 cells, no apoptosis was observed for UVA-activated complex 3 by the Annexin V/propidium iodide flow cytotometry assay. Changes in the levels of the autophagic proteins LC3B-II and p62 in HL60 cells treated with UVA-activated complex 3 indicate autophagy is active during cell death. In a clonogenic assay with the SISO human cervix cancer cell line, 3 inhibited colony formation when activated by UVA irradiation. Antitumor activity of complex 3 in mice bearing xenografted OE19 esophageal carcinoma tumors was photoaugmented by visible light. Insights into the novel reaction pathways of complex 3 have been obtained from 14N{1H} nuclear magnetic resonance studies, which show that photoactivation pathways can involve release of free azide in buffered solution. Density functional theory (DFT) and time-dependent DFT calculations revealed the dissociative character of singlet and triplet excited states of complex 3, which gives rise to reactive, possibly cytotoxic azidyl radicals. Mol Cancer Ther; 11(9); 1894–904. ©2012 AACR. |
| تدمد: | 1538-8514 1535-7163 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::96b41f080da70ff3f659c50f6473774bTest https://doi.org/10.1158/1535-7163.mct-11-0959Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....96b41f080da70ff3f659c50f6473774b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15388514 15357163 |
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