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Critical Reviews™ in Immunology

Publicado 6 números por año

ISSN Imprimir: 1040-8401

ISSN En Línea: 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

Indexed in

A Nondeletional Mechanism for Central T-Cell Tolerance

Volumen 21, Edición 1-3, 2001, 12 pages
DOI: 10.1615/CritRevImmunol.v21.i1-3.20
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SINOPSIS

To be positively selected, immature thymocytes must receive signaling through their T-cell receptor (TCR), and engagement of relatively low-affinity self-peptides permits further T-cell maturation. However, mature T cells no longer overtly respond to such low-affinity antigens, indicating that T cells acquire a higher threshold for activation during thymopoiesis. We wondered whether partial interference in positive selection could produce T cells that respond to the selecting self-peptide. This possibility was tested by injecting procainamide-hydroxylamine (PAHA), a lupus-inducing drug, into the thymus of adult normal mice. Three weeks after the second injection, IgG antichromatin antibodies appeared in the circulation and remained for several months. The murine antichromatin antibodies reacted with the (H2A-H2B)–DNA subnucleosome complex, the predominant specificity in patients with procainamide-induced lupus. In thymus organ and reaggregate cultures, PAHA had no effect on negative selection of T cells with high affinity for a co-present antigen, but acted on CD4+CD8+ immature T cells as they underwent positive selection. TCR transgenic T cells specific to cytochrome c peptide 88-104 acquired the capacity to respond to the low-affinity analogue at position 99 (lys®ala) if PAHA was present during their development. PAHA also blocked the capacity of a T-cell line to become anergic after anti-CD3 treatment, suggesting that PAHA prevents the production of negative regulators that accumulate in response to partial signaling through the TCR. These results are consistent with the view that T cells acquire self-tolerance during positive selection, and disruption of this process can result in autoreactive T cells and systemic autoimmunity.

CITADO POR
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  9. Zhao Yong, Rodriguez-Barbosa Jose-Ignacio, Shimizu Akira, Sachs David H., Sykes Megan, Despite efficient intrathymic negative selection of host-reactive T cells, autoimmune disease may develop in porcine thymus-grafted athymic mice: evidence for failure of regulatory mechanisms suppressing autoimmunity1, Transplantation, 75, 11, 2003. Crossref

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