Apical-basal polarity signaling in glioblastoma

在美国，每年有超过44，500人被诊断出患有脑部或脊柱原发性肿瘤。的 在这一组中，大约有20，500人被诊断患有原发性恶性脑肿瘤。脑肿瘤也是 第二常见的儿童癌症，约占所有儿科癌症的25%。是 儿童实体瘤癌症死亡的主要原因。脑肿瘤的死亡率非常高， 中位生存期约为12个月。值得注意的是， 在过去的二十年里，恶性胶质瘤继续为成功的临床治疗提出重大问题， 目前的手术、放疗或化疗方案治疗。极具侵略性的 恶性胶质瘤-胶质母细胞瘤细胞迅速侵入周围脑实质-源于缺陷 控制细胞运动的基因。手术切除后残留的侵袭性肿瘤细胞混淆了临床 管理和显着有助于这种疾病的致命性。此外，化疗和 胶质瘤细胞的放射治疗抗性亚群保留干细胞样性质以重新接种肿瘤。这 导致复发，预后更差。胶质瘤干细胞群体可能在基因上存在缺陷， 控制自我更新、增殖和分化。有效地靶向这些侵入性细胞， 干细胞群体对于改善恶性肿瘤的管理和积极的临床结果至关重要， 神经胶质瘤这项提议的目的是确定顶端-基底极性信号传导是否是一个重要的 胶质瘤侵袭性病理和复发的分子因素。我们观察到，改变的顶端- 基底极性信号导致未分化细胞的快速增殖和异常迁移， 胚胎神经干细胞在鸡中枢神经系统发育中的标志物。根据此前 研究中，我们假设顶端-基底极性信号通路功能异常可能在 胶质母细胞瘤的侵袭性发展和生长。本提案的具体目标是：㈠验证 我们的初步观察表明，顶-基底极性信号通路的升高与 本研究的目的是探讨该通路在胶质瘤病理学中的作用。这 这项研究有可能阐明顶端-基底极性信号通路在胶质瘤侵袭中的分子功能， 生长和进展，并提供了针对这一途径的概念验证，作为一种新的战略， 胶质母细胞瘤治疗我们的长期目标是在一种改进的治疗方法中合理地靶向这一途径。 神经胶质瘤的范例。

Over 44,500 people in the United States are diagnosed with a primary tumor in the brain or spine each year. Of this group, approximately 20,500 are diagnosed with primary malignant brain tumors. Brain tumors are also the second most common cancer of childhood comprising approximately 25% of all pediatric cancers. It is the leading cause of solid tumor cancer death in children. Mortality rates from brain tumors are extremely high, with a median survival of approximately 12 months. Notably, mortality rates have remained unchanged over the last two decades as malignant gliomas continue to present significant problems for successful clinical treatment with the current regimen of surgery, radiotherapy or chemotherapy. The highly aggressive nature of malignant gliomas - glioblastoma cells rapidly invade the surrounding brain parenchyma - stems from defects in genes that control cell motility. Invasive tumor cells remaining after surgical resection confound clinical management and significantly contribute to the lethality of this disease. Additionally, a chemotherapy and radiotherapy resistant subpopulation of glioma cells retain stem cell-like properties to re-seed the tumor. This leads to recurrence with even poorer prognosis. The glioma stem cell population may harbor defects in genes that control self-renewal, proliferation and differentiation. Effective targeting of these invasive cells and the stem cell population is critical for the improved management and positive clinical outcome in malignant gliomas. The objective of this proposal is to determine if apical-basal polarity signaling is an important molecular element in the invasive pathology and recurrence of gliomas. We have observed that altered apical- basal polarity signaling causes the rapid proliferation and abnormal migration of undifferentiated cells bearing markers of embryonic neural stem cells in the developing chick central nervous system. Based on this previous study, we hypothesize that aberrant function of apical-basal polarity signaling pathway may play a central role in the invasive progression and growth of glioblastoma. The specific aims of this proposal are: (i) to validate our preliminary observation of a positive association between elevated apical-basal polarity signaling pathway components and clinical glioblastoma, and to investigate the function of this pathway in glioma pathology. This study is likely to elucidate the molecular function of apical-basal polarity signaling pathway in glioma invasion, growth and progression, and provide the proof-of-concept for targeting this pathway as a novel strategy for glioblastoma therapy. Our long-term goal is the rational targeting of this pathway in an improved therapeutic paradigm for gliomas.