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环境病理学,毒理学和肿瘤学期刊

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ISSN 打印: 0731-8898

ISSN 在线: 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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Characterization of Apoptosis Induced by Photodynamic Treatment with Hypericin in A431 Human Epidermoid Carcinoma Cells

卷 25, 册 1-2, 2006, pp. 173-188
DOI: 10.1615/JEnvironPatholToxicolOncol.v25.i1-2.100
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摘要

Hypericin is a naturally occurring metabolite extracted from Hypericum plants and is regarded as a promising photosensitizing agent for applications in the frame of photodynamic treatment (PDT). This treatment procedure is based on the light-induced formation of reactive oxygen species and subsequent destruction of target cells. We used an in vitro model system consisting of human epidermoid carcinoma cells (A431) and hypericin as a photosensitizer to study the time- and dose-dependent characteristics of hypericin-PDT-based induction of cytotoxicity and apoptotic cell death. The induction of apoptosis by hypericin-PDT was found to follow a strict dose-dependent manner with a transition to necrotic cell death at higher doses. Apoptosis was analyzed by characteristical biochemical and morphological markers (activation of caspases, nuclear fragmentation and membrane blebbing). Time-course analysis of an almost homogenous apoptotic population of cells (at 1.44 J/cm2) showed a rapid increase in nuclear fragmentation and activation of caspases reaching a maximum at 5 hr after irradiation. Using specific caspase substrates, significant activation of caspase-2, -3, -6, and -9 was found. Mitochondrial involvement during hypericin-PDT-induced apoptosis could be proven by a rapid reduction of the mitochondrial membrane potential; interestingly, the level of intracellular adenosine-5'-triphosphate (ATP) remains at control level for up to 6 hr post irradiation suggesting upregulation of glycolysis as a compensating mechanism of energy supply. Our data contribute to a deeper understanding of the processes involved in apoptotic cell death following photodynamic treatment with hypericin.

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