1,720,971 research outputs found
Exemplifying complexity of immune suppression by a “canonical” speech: A glimpse into TNFRSF‐activated signaling pathways in Treg cells
No full textRegulatory T (Treg) cells are crucial mediators of immune tolerance suppressing self-reactive T cells and preventing autoimmune diseases. Besides activation of the T cell receptor (TCR), empowerment of Treg cell functions requires co-accessory signals, such as those released by the TNF receptor superfamily (TNFRSF) that, however, can also promote immunostimulatory responses when engaged by effector T cells. In this issue of European Journal of Immunology, Lubrano di Ricco et al. [Eur. J. Immunol. 2020. 50: 972–985] have taken a closer look at the important question of the functional meaning of TNFRSF-activated signaling pathways in Treg cells. They have demonstrated that costimulation by TNFR2, 4-1BB, GITR, DR3, but not OX40 in mouse Foxp3+ Treg cells activates the same and unique signaling pathway, i.e., canonical NF-κB, which in turn leads to Foxp3 gene upregulation, cell expansion in vitro and in vivo, and suppressive activity in an experimental model of colitis. Moreover, induction of markers of T helper 2 (Th2) and Th17 as well as of genes encoding proteins involved in noncanonical NF-κΒ was also observed. We here discussed how these findings further highlight the emerging concept of Treg cell plasticity in immune tolerance
Lymphocyte traffic changes induced by monolateral vagal denervation in mouse thymus and peripheral lymphoid organs
No full textIn this report we show that after monolateral vagal denervation (vagotomy), performed at the cervical level, a transient effect, lasting about 24 h, was produced on lymphocyte release from mouse thymus to peripheral lymphoid organs (spleen and lymph nodes). Labelling thymocytes in situ with fluorescein isothiocyanate (FITC) we note that the export of immature cells, CD4+CD8+, double positive (DP), and double negative, CD4-CD8- (DN), from the thymus was consistently increased 24 and 48 h after vagotomy. Double staining with anti-L3T4 (CD4) and anti-mouse CD8α showed that the number of DP and DN cells was significantly higher in both spleen and lymph nodes of vagotomized mice compared to controls (sham-operated), whereas the percentage of CD4+CD8- and CD8+CD4-, single positives (SP), was decreased. Considering thymic cellularity and apoptotic values, we exclude the non-specific effect of stress and suggest that this phenomenon could be in part due to a transient lack of the facilitating influence exerted by vagal efferent fibers on lymphocyte traffic at the cortico-medullary junction of the thymic gland, where mature cells, SP, leave the thymus to enter systemic circulation
Author Correction: Methylprednisolone stimulated gene expression (GILZ, MCL-1) and basal cortisol levels in multiple sclerosis patients in relapse are associated with clinical response (Scientific Reports, (2021), 11, 1, (19462), 10.1038/s41598-021-98868-y)
No full textThe original version of this Article contained an error in the order of the References 16 and 17, which was incorrectly given as: 16. Hoepner, R. et al. Vitamin D increases glucocorticoid efficacy via inhibition of mTORC1 in experimental models of multiple sclerosis. Acta Neuropathol. https:// doi. org/ 10. 1007/ s00401- 019- 02018-8 (2019). 17. Ayroldi E, Riccardi C. Glucocorticoid‐induced leucine zipper (GILZ): a new important mediator of glucocorticoid action. FASEB J 23, 3649–3658 (2009). The correct order of the References is listed below: 16. Ayroldi E, Riccardi C. Glucocorticoid‐induced leucine zipper (GILZ): a new important mediator of glucocorticoid action. FASEB J 23, 3649–3658 (2009). 17. Hoepner, R. et al. Vitamin D increases glucocorticoid efficacy via inhibition of mTORC1 in experimental models of multiple sclerosis. Acta Neuropathol. https:// doi. org/ 10. 1007/ s00401- 019- 02018-8 (2019). The original Article has been corrected. © 2021, The Author(s)
Inhibition of proliferation of retrovirus-immortalized macrophages by LPS and IFN-γ: Possible autocrine down-regulation of cell growth by induction of IL1 and TNF
No full textThe GG2EE macrophage tumor cell line was previously established by immortalization of C3H/HeJ mouse bone marrow cells with the J2 retrovirus which contains the v-myc and v-raf oncogenes. Studies on the control of GGZEE cell proliferation in vitro have recently been performed. We observed that the combination of 5-25 U/ml recombinant mouse interferon-γ (rmIFN-γ) plus 0.03 - 0.3 μg/ml lipopolysaccharide (LPS) markedly inhibited the proliferation of GG2EE cells (by >95%)in vitro, while either agent alone inhibited only by <40% and 0-10%, respectively. Subsequent studies established that biologically active ILI-like (2-4 U/ml) and TNF α-like (50-100 U/ml) activities were released into the supernatants of LPS-treated GG2EE cells. The combination of IFN-γ + LPS induced more (6-8 U/ml) ILI release. These results suggested that the inhibition of proliferation of GG2EE cells by IFN-γ + LPS could have been mediated in part by cytokines produced by the cells themselves. rhIL1 α at a concentration of 10 U/ml inhibited GG2EE proliferation by 25-30%, while rmIFN-γ (25 U/ml) + rhIL1 α (10 U/ml) inhibited proliferation by 98%. Thus, 10 U/ml rhIL1 α could completely replace LPS in the LPS + rmIFN-γ combination. Further, the combination of low doses of rhIL1 α (0.1 to 1 U/ml) plus rmTNF α (250 U/ml), which together inhibited proliferation by <20% synergized with doses of 5 to 25 U/ml rmIFN-γ to inhibit proliferation of GG2EE cells by 98-99%. These results suggest that cytokines produced by the cells themselves can synergize with rmIFN-γ to inhibit the oncogene-driven proliferation of GG2EE cells. © 1992 Kluwer Academic Publishers
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
