Spatial regulation of mechanistic target of rapamycin complex 1 (mTORC1) and its role in oral squamous cell carcinoma

雷帕霉素复合物1（mTORC1）机械靶点的空间调控及其在口腔鳞状细胞癌中的作用

• 批准号: 10750317
• 负责人: Ayse Zisan Sahan
• 金额: $ 4.15万
• 依托单位: UNIVERSITY OF CALIFORNIA, SAN DIEGO
• 依托单位国家: 美国
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10750317
• 关键词: 3-Phosphoinositide Dependent Protein Kinase-1; Affect; Amino Acids; Apoptosis; Autophagocytosis; Biochemical; Biological Assay; Biosensor; Cancer Model; Cell Line; Cell Nucleus; Cell Proliferation; Cell Survival; Cells; Cessation of life; Complex; Cytosol; DNA Sequence Alteration; Data; Disease; Drug resistance; Enzyme-Linked Immunosorbent Assay; Enzymes; Epidermal Growth Factor; FRAP1 gene; Fluorescence Resonance Energy Transfer; Genes; Genetic Transcription; Growth; Growth Factor; In Vitro; Inflammatory; Location; Lysosomes; Malignant Epithelial Cell; Malignant Neoplasms; Metabolism; Monitor; Mus; Nuclear; Nutrient; Pathway interactions; Phosphatidylinositols; Phosphotransferases; Play; Proliferating; Proteins; Reactive Oxygen Species; Regulation; Reporter; Reporting; Research; Resistance; Role; Signal Pathway; Signal Transduction; Specificity; Survival Rate; Testing; Transcriptional Regulation; Translations; Work; Xenograft Model; cell growth; cytokine; differential expression; drug sensitivity; experimental study; in vivo; inhibitor; mouth squamous cell carcinoma; peroxisome; phosphoproteomics; tool; transcription factor; transcriptome sequencing; tumor; tumor growth; tumor xenograft

Project Summary Mechanistic target of Rapamycin (mTOR) complex 1 (mTORC1) integrates inputs from multiple pathways and senses diverse signals to regulate cell growth, protein translation, and proliferation1,2. Given that spatial compartmentalization can enhance signaling specificity and efficiency3,4, spatial regulation of mTORC1 appears to be critical for this multifaceted signaling complex5 as it has been reported at many subcellular locations6–9. For example, mTORC1 at the lysosome is regulated by both amino acids and growth factors and functions to promote translation and suppress autophagy10. The complex has also been identified at peroxisomes, where mTORC1 responds to reactive oxygen species7. However, the roles of mTORC1 at other subcellular locations where its presence has been reported, in particular in the nucleus, are not well understood. A major limitation in the field is the availability of tools to assess the activity and function of spatially compartmentalized signaling enzymes in living cells. Using a genetically encoded fluorescent biosensor to monitor mTORC1 activity, the Zhang lab has previously discovered a pool of nuclear mTORC1, which has yet to be defined in function. Based on our preliminary data, we hypothesize that nuclear mTORC1 regulates pro-inflammatory transcription. We will test this hypothesis by combining targeted inhibition of mTORC1 with a phosphoproteomics experiment and biochemical assays. Lastly, since genetic mutations activating phosphoinositide 3-kinase(PI3K)/protein kinase B (Akt)/mTOR signaling are prominent alterations in oral squamous cell carcinoma (OSCC)11,12 and mTORC1 inhibition can induce tumor regression13,14, we will study the role of subcellular mTORC1 signaling in the growth and drug resistance of OSCC cells in vitro and in vivo in mice. We hypothesize that inhibiting mTORC1 in the nucleus or the cytosol will differentially effect cell growth and EGFR inhibitor resistance in OSCC. The proposed project will elucidate the function of the previously undefined pool of nuclear mTORC1 and clarify the roles of subcellular mTORC1 in the growth and drug resistance of OSCC.

项目概要 雷帕霉素 (mTOR) 复合物 1 (mTORC1) 的机械靶标整合了来自多个途径的输入， 感知不同的信号来调节细胞生长、蛋白质翻译和增殖1,2。 区室化可以增强信号传导特异性和效率3,4，mTORC1 的空间调节出现 对于这种多方面的信号复合体5至关重要，因为它已在许多亚细胞位置6-9中被报道。 例如，溶酶体中的 mTORC1 受氨基酸和生长因子的调节，并发挥作用 该复合物也在过氧化物酶体中被发现，其中 mTORC1 对活性氧有反应7 然而，mTORC1 在其他亚细胞位置的作用。 其存在的报道，特别是在细胞核中，尚不清楚。 该领域是评估空间分区信号的活动和功能的工具的可用性 使用基因编码的荧光生物传感器监测活细胞中的酶。 张实验室此前发现了一个核mTORC1池，但其功能尚未被定义。 根据我们的初步数据，我们勇敢地相信核 mTORC1 调节促炎症转录。 通过将 mTORC1 的靶向抑制与磷酸蛋白质组学实验相结合来检验这一假设 最后，由于基因突变激活磷酸肌醇 3-激酶 (PI3K)/蛋白激酶。 B (Akt)/mTOR 信号传导是口腔鳞状细胞癌 (OSCC)11,12 和 mTORC1 中的显着改变 抑制可以诱导肿瘤消退13,14，我们将研究亚细胞mTORC1信号在生长中的作用 我们捕获了小鼠体内和体外 OSCC 细胞对 mTORC1 的抑制作用。 细胞核或细胞质将对 OSCC 中的细胞生长和 EGFR 抑制剂耐药性产生不同的影响。 该项目将阐明以前未定义的核 mTORC1 库的功能，并阐明 亚细胞 mTORC1 在 OSCC 生长和耐药性中的作用。