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Critical Reviews™ in Immunology

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ISSN Druckformat: 1040-8401

ISSN Online: 2162-6472

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: 1.3 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: 2.6 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: 0.00079 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: 0.24 SJR: 0.429 SNIP: 0.287 CiteScore™:: 2.7 H-Index: 81

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Signaling Pathways Involved in Glucocorticoid-Induced Apoptosis of Thymocytes

Volumen 25, Ausgabe 4, 2005, pp. 263-288
DOI: 10.1615/CritRevImmunol.v25.i4.20
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ABSTRAKT

This review synthesizes recent insights on the signaling pathways triggered by glucocorticoids during apoptosis of thymocytes. Thymocyte apoptosis is a complex process, which is involved in thymic selection. Even if the main partners are identified, there still remain dark zones on the whole pathway and notably on the crosstalk between each signaling cascade. Glucocorticoids trigger thymocyte apoptosis by enhancing cyclin-dependent kinase 2 activity, downregulating the expression of antiapoptotic Bcl-2 proteins, and upregulating that of proapoptotic Bcl-2 proteins. These events result in mitochondrial alterations and subsequent caspase activation. Proteasome intervenes at various levels of the signaling cascades—for instance, degrading the glucocorticoid receptor or caspase inhibitory proteins. Changes in intracellular K+ and Ca2+ concentrations are involved in caspase and endonulease activation. All these effects are dependent on macromolecular synthesis. The only known non-genomic effect of glucocorticoids is an early production of sphingolipids (ceramide and sphingosine), which are involved in caspase activation independent of mitochondrial alterations. Externalization of phosphatidylserine, a process mediating phagocytosis of dying thymocytes, depends on pathways that diverge from those leading to nuclear apoptosis.

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