9 research outputs found

    Graduate Recital: Deborah Carpi

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    Kemp Recital HallMarch 27, 2012Tuesday Evening7:00 p.m

    Graduate Recital: Deborah Carpi

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    Kemp Recital HallMarch 27, 2010Saturday Evening7:00 p.m

    31st Annual Meeting and Associated Programs of the Society for Immunotherapy of Cancer (SITC 2016) : part two

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    Background The immunological escape of tumors represents one of the main ob- stacles to the treatment of malignancies. The blockade of PD-1 or CTLA-4 receptors represented a milestone in the history of immunotherapy. However, immune checkpoint inhibitors seem to be effective in specific cohorts of patients. It has been proposed that their efficacy relies on the presence of an immunological response. Thus, we hypothesized that disruption of the PD-L1/PD-1 axis would synergize with our oncolytic vaccine platform PeptiCRAd. Methods We used murine B16OVA in vivo tumor models and flow cytometry analysis to investigate the immunological background. Results First, we found that high-burden B16OVA tumors were refractory to combination immunotherapy. However, with a more aggressive schedule, tumors with a lower burden were more susceptible to the combination of PeptiCRAd and PD-L1 blockade. The therapy signifi- cantly increased the median survival of mice (Fig. 7). Interestingly, the reduced growth of contralaterally injected B16F10 cells sug- gested the presence of a long lasting immunological memory also against non-targeted antigens. Concerning the functional state of tumor infiltrating lymphocytes (TILs), we found that all the immune therapies would enhance the percentage of activated (PD-1pos TIM- 3neg) T lymphocytes and reduce the amount of exhausted (PD-1pos TIM-3pos) cells compared to placebo. As expected, we found that PeptiCRAd monotherapy could increase the number of antigen spe- cific CD8+ T cells compared to other treatments. However, only the combination with PD-L1 blockade could significantly increase the ra- tio between activated and exhausted pentamer positive cells (p= 0.0058), suggesting that by disrupting the PD-1/PD-L1 axis we could decrease the amount of dysfunctional antigen specific T cells. We ob- served that the anatomical location deeply influenced the state of CD4+ and CD8+ T lymphocytes. In fact, TIM-3 expression was in- creased by 2 fold on TILs compared to splenic and lymphoid T cells. In the CD8+ compartment, the expression of PD-1 on the surface seemed to be restricted to the tumor micro-environment, while CD4 + T cells had a high expression of PD-1 also in lymphoid organs. Interestingly, we found that the levels of PD-1 were significantly higher on CD8+ T cells than on CD4+ T cells into the tumor micro- environment (p < 0.0001). Conclusions In conclusion, we demonstrated that the efficacy of immune check- point inhibitors might be strongly enhanced by their combination with cancer vaccines. PeptiCRAd was able to increase the number of antigen-specific T cells and PD-L1 blockade prevented their exhaus- tion, resulting in long-lasting immunological memory and increased median survival

    The Right to Play Versus the Right to War? Vulnerable Childhood in Lebanon’s NGOization

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    International audienceIn the wake of the massive human displacement from Syria (2011–), some international NGOs (INGOs) have intervened in Lebanon to prevent Lebanese and Syrian youth from “radicalizing” and joining armed groups. In the framework of international humanitarian assistance within the “Global South,” while refugee adults are expected to become self-reliant, children and youth are often addressed as objects of universal concern and rarely as aware subjects of decision-making. Drawing on interviews conducted between Spring 2015 and Autumn 2016 with INGO workers and child players and their parents, we consider INGO play activities in contexts where political violence is widespread and longstanding, such as the Tripoli governorate in northern Lebanon. This chapter first aims to unpack the INGO discourse on children’s vulnerability. Second, we analyze INGO discourses and practices in a bid to critically examine the humanitarian and developmental attempts at providing politically neutral spaces for refugee and local children. We therefore build a threefold analysis focusing on the dehistoricization of political violence in the Arab Levant, the employment of the “Sport for Development” formula as a path to social cohesion, and the weak cultural literacy of INGOs in regard to contextual adult-child relations. Thereby, we argue that while INGOs tend to commodify the child as an a priori humanitarian victim, the international assistance community should rather strive to provide children with alternate avenues for political engagement in order to counter war recruitment
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