Discovery and characterization of exceptionally specific surface oncoprotein LIPI in Ewing Sarcoma

项目摘要 癌基因融合转录因子EWS-1驱动的儿童和年轻人转移性尤文肉瘤 FLI1的结果仍然很差。使用T细胞、NK细胞、癌症疫苗和 目前正在考虑用单抗治疗尤文肉瘤，特别是复发患者。这个 识别免疫系统识别的人类肿瘤相关抗原(TAA)对于 免疫疗法。通过整合尤文肉瘤细胞系的基因表达，芯片序列，正常和 癌症组织基因表达来自基因类型-组织表达(GTEx)和TCGA项目，我们有 LIPI是一种高度特异的肿瘤抗原和依赖于转录活性的潜在癌基因 EWS-FLI1在尤文肉瘤中的表达。LIPI(Lipase Members I，EC：3.1.1.-)是一种进化保守的蛋白质 预测构成跨膜结构域和细胞外脂水解酶结构域。它的生物学功能 LIPI尚不清楚，但LIPI的酶活性有望产生溶血磷脂酸(LPA)，从而 潜在地影响多种生物学功能，包括肿瘤细胞的增殖、细胞存活和转移。 我们假设LIPI是一个独特的生物标志物和癌基因，它只在尤因表达。 肉瘤，是基于细胞的治疗的潜在靶点。据我们所知，这项建议是第一个 评价LIPI在细胞生理学中的作用，特别是尤文肉瘤进展和 转移。这些项目的两个具体目标是： 特异性目标1：阐明细胞表面LIPI在尤文肉瘤中的调节和作用 特异性目的2：探讨LIPI在尤文肉瘤生长/转移中的作用。 在成功完成本申请的拟议目标后，我们将评估其潜力 LIPI作为尤文肉瘤特异性表面癌蛋白，并将通过建立 为开发激光诱导免疫疗法治疗尤文肉瘤奠定了坚实的基础。

Project Summary Children and young adults with metastatic Ewing sarcoma driven by oncogenic fusion transcription factor EWS- FLI1 continue to have poor outcomes. Immunotherapies using T cells, NK cells, cancer vaccines, and monoclonal antibodies are being considered for Ewing sarcoma, especially for recurrent patients. The identification of human tumor-associated antigens (TAAs) recognized by the immune system is crucial for immunotherapy. Through integration of Ewing sarcoma cell line gene expression, ChIP-seq, and normal and cancer tissue gene expression from the Genotype-Tissue Expression (GTEx), and the TCGA project, we have identified LIPI as a highly specific tumor antigen and a potential oncogene that relies on the transcriptional activity of EWS-FLI1 in Ewing sarcoma. LIPI (Lipase member I (EC:3.1.1.-) is an evolutionarily conserved protein predicted to poses a transmembrane domain and extracellular lipid hydrolase domain. The biological function of LIPI is not known but the enzymatic activity of LIPI is expected to produce lysophosphatidic acid (LPA) that potently affects several biological functions including proliferation, cell survival, and metastasis of tumor cells. We hypothesize that the LIPI is a unique biomarker and an oncogene that is expressed exclusively in Ewing sarcoma and is a potential target for cell based therapy. To our knowledge, this proposal represents the first study evaluating the role of LIPI in cellular physiology and in particular Ewing sarcoma progression and metastasis. The two specific aims of the projects are: Specific Aim 1: To elucidate the regulation and role of cell surface LIPI in Ewing sarcoma Specific Aim 2: To investigate the role of LIPI in Ewing sarcoma growth/metastasis. Following the successful completion of the proposed aims in this application, we will have evaluated the potential of LIPI as a Ewing sarcoma specific surface oncoprotein, and will have a long-term impact by establishing the strong foundation for the development of LIPI-directed immunotherapeutics against Ewing sarcoma.