Tyrosine Kinase-Dependant and - Independent Pathways of EGFR in Breast Cancer Pro

项目总结（见说明）： 表皮生长因子受体（EGFR）是一种细胞膜结合酪氨酸激酶， 在乳腺癌进展中起重要作用，并通过激酶依赖性调节细胞代谢 独立的机制。此外，积累的证据表明， 癌症进展与能量代谢的关系。代谢失调甚至最近 被认为是癌症的第七个标志，除了公认的六个标志。 最近，我们已经证明，EGFR，独立于其激酶活性，维持基础的， 通过与钠/葡萄糖协同转运蛋白（SGLT 1）结合并稳定其， 从而防止细胞发生自噬性死亡。结果与 AKT可能激活另一种葡萄糖转运蛋白GLLIT 4以增强能量代谢的文献 刺激我们假设EGFR可能通过酪氨酸激酶 依赖和独立的途径，这可能有助于EGFR介导的恶性表型， 乳腺癌细胞此外，我们和其他人还表明，细胞表面受体介导的激酶 包括ERK、AKT和IKK调节TSC 1/TSC 2复合物和FoxoSa，已知这两者都涉及 肿瘤进展和能量平衡。这三种激酶在人类癌症中经常被激活 包括乳腺癌，并且已经用作开发抗癌药物的治疗靶标。 该提案的长期目标是了解乳腺癌进展的分子机制， 代谢调节具体而言，在目前的提案中，我们提出了三个具体目标来实现这些目标： 具体目的1：阐明激酶非依赖性EGFR介导的葡萄糖转运蛋白的作用 乳腺肿瘤进展中的信号传导。具体目标2：研究能量代谢 受激酶依赖性EGFR信号通路调节。具体目标3：确定作用 激酶依赖性EGFR信号在乳腺肿瘤进展中的作用。该项目的成果将 促进对葡萄糖代谢对乳腺癌进展的影响的理解， 乳腺癌治疗的新方向。

PROJECT SUMMARY (See Instructions): The signaling pathway of epidermal growth factor receptor (EGFR), a cell membrane bound tyrosine kinase, plays an important role in breast cancer progression and regulates cell metabolism through kinasedependent and -independent mechanism. Additionally, accumulated evidence has demonstrated the close relationship between cancer progression and energy metabolism. Metabolic deregulation has even lately been considered as the seventh hallmark of cancers in addition to the well-established six hallmarks. Recently, we have demonstrated that EGFR, independent of its kinase activity, maintains the basal intracellular glucose level by associating with and stabilizing a sodium/glucose cotransporter (SGLT1), thereby preventing cells from undergoing autophagic death. The resulL together with those reported in the literature that AKT may activate another glucose transporter, GLLIT4 to enhance energy metabolism had stimulated us to hypothesize that EGFR may mediate glucose uptake through both tyrosine kinase dependent and independent pathways, which may contribute to the EGFR-mediated malignant phenotype in breast cancer cells. In addition, we and others have also shown that cell surface receptor-mediated kinases including ERK, AKT and IKK regulate TSC1/TSC2 complex and FoxoSa, both of which are known to involve in tumor progression and energy balance. These three kinases are frequently activated in human cancers including breast cancer and have served as therapeutic targets for the development on anti-cancer drugs. The long-term goal of this proposal is to understand molecular mechanism of breast cancer progression and metabolic regulation. Specifically, in the current proposal we propose three Specific Aims to fulfill the goals: Specific Aim 1: To elucidate the role of kinase-independent EGFR mediated glucose transporter signaling in mammary tumor progression. Specific Aim 2: To investigate energy metabolism regulated by the kinase-dependent EGFR signaling pathways. Specific Aim 3: To determine the role of kinase-dependent EGFR signaling in mammary tumor progression. The outcome of this project will advance an understanding on the effect of glucose metabolism on breast cancer progression and may shed light on new directions for breast cancer therapy.