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Journal of Environmental Pathology, Toxicology and Oncology

Erscheint 4 Ausgaben pro Jahr

ISSN Druckformat: 0731-8898

ISSN Online: 2162-6537

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 2.4 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 2.8 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.5 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00049 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.59 SJR: 0.429 SNIP: 0.507 CiteScore™:: 3.9 H-Index: 49

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Reactive Oxygen Species Mediate Cr(VI)-induced S Phase Arrest Through p53 in Human Colon Cancer Cells

Volumen 31, Ausgabe 2, 2012, pp. 95-107
DOI: 10.1615/JEnvironPatholToxicolOncol.v31.i2.20
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ABSTRAKT

Compounds that contain chromate (Cr(VI)) are well-known carcinogens that are present in both industrial settings and the environment. The mechanism of carcinogenesis associated with these compounds is not well understood. This study focused on Cr(VI)-induced cell cycle arrest in human colon adenocarcinoma DLD1 cells. Treatment of the cells with Cr(VI) at 2.5 µM caused a growth arrest at the S phase. An increase in Cr(VI) concentration enhanced the growth arrest. Superoxide dismutase did not alter the Cr(VI)-induced S phase arrest. Catalase inhibited S-cell growth, indicating that H2O2 is an important mediator in Cr(VI)-induced S phase arrest. Electron spin resonance spin-trapping measurements showed that incubation of cells with Cr(VI) generated hydroxyl radical (·OH). Catalase inhibited ·OH generation, indicating that H2O2 was generated from cells stimulated by Cr(VI) and that H2O2 functioned as a precursor of ·OH radical generation. p53, an oxidative response transcription factor, was activated upon Cr(VI) stimulation. Inhibition of p53 by introducing small hairpin RNA decreased S phase arrest induced by Cr(VI). These results support the following conclusions: (1) reactive oxygen species (ROS) are generated in Cr(VI)-stimulated DLD1 cells; (2) among the ROS generated, H2O2 played a major role in causing S phase arrest in DLD1 cells; and (3) ROS mediated S phase arrest through a p53-dependent pathway.

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