104 research outputs found
The Cultural Revolution
The Chinese Communist system was from its very inception based on an inherent contradiction and tension, and the Cultural Revolution is the latest and most violent manifestation of that contradiction. Built into the very structure of the system was an inner conflict between the desiderata, the imperatives, and the requirements that technocratic modernization on the one hand and Maoist values and strategy on the other. The Cultural Revolution collects four papers prepared for a research conference on the topic convened by the University of Michigan Center for Chinese Studies in March 1968. Michel Oksenberg opens the volume by examining the impact of the Cultural Revolution on occupational groups including peasants, industrial managers and workers, intellectuals, students, party and government officials, and the military. Carl Riskin is concerned with the economic effects of the revolution, taking up production trends in agriculture and industry, movements in foreign trade, and implications of Masoist economic policies for China’s economic growth. Robert A. Scalapino turns to China’s foreign policy behavior during this period, arguing that Chinese Communists in general, and Mao in particular, formed foreign policy with a curious combination of cosmic, utopian internationalism and practical ethnocentrism rooted both in Chinese tradition and Communist experience. Ezra F. Vogel closes the volume by exploring the structure of the conflict, the struggles between factions, and the character of those factions
31st Annual Meeting and Associated Programs of the Society for Immunotherapy of Cancer (SITC 2016) : part two
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
East Aisa in the Next Fifty Years
開催:2015年6月13日11:10-12:30 城西大学清光ホール 使用言語:日本語 対象:一般 定員:500名(要事前申込み) 受講料:無料 申込締切:2015年5月30日 申込先:城西大学総務課 講師:エズラ・F・ヴォーゲル氏(ハーバード大学ヘンリー・フォードⅡ世社会科学名誉教授) 水田三喜男記念「グローバル・レクチャー」シリー
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