Role of MUC5AC in promoting CNS metastasis in Non-Small Cell Lung Cancer

肺癌（LC）是世界上癌症相关死亡率的主要原因，占癌症死亡率的约24%。 妇女和男子的相关死亡。非小细胞肺癌的5年生存率预测 （NSCLC）为21%。LC患者的高死亡率归因于他们通常在一个 晚期，治疗方案大多是姑息性的。脑转移仍然是一个主要的原因， 发病率和死亡率。大约25-40%的非小细胞肺癌发展为中枢神经系统 (CNS)转移我们最近的研究发现，MUC 5AC在NSCLC中过表达，并且与肿瘤的发生发展有关。 预后不佳。此外，发现Muc 5ac在基因工程改造的肺组织中过表达。 小鼠模型（GEMM）（KrasG 12 D; AdCre和KrasG 12 D; Trp 53 R172 H/+; AdCre）。我们已经证明MUC 5AC 与整合素β4相互作用，通过激活粘着斑激酶（FAK）导致肺癌细胞转移。在 此外，我们观察到LC脑转移组织中MUC 5AC表达增加。基于这些 研究中，我们假设MUC 5AC在肺癌中过表达，并在大脑中起着重要作用。 转移 为了验证这一假设，我们提出了三个具体的目标：目标1将定义MUC 5AC作为一种生物标志物的作用， 探讨其在肺癌脑转移中的临床病理意义。在目标2中， 将系统地描述MUC 5AC在LC脑转移瘤发展中的分子机制。 这将突出MUC 5AC/整合素β4轴在细胞粘附中的机制和功能意义， 本研究旨在确定LC的进展和转移，并将鉴定MUC 5AC在外来体中的存在及其在LC中的作用。 转移最后，目标3将确定MUC 5AC介导的脑转移的生物学和MUC 5AC对脑转移的影响。 抑制，使用GEMM模型。在这个目标中，我们将使用我们的GEM模型和破译的分子签名 以及在存在和不存在Muc 5ac的情况下肺肿瘤的进展和转移。我们还将隔离 来自肺癌患者和GEMM模型的类肿瘤或外来体，包括Muc 5ac-/-小鼠，以鉴定 转移效率我们将使用MUC 5AC靶向抗体来确定MUC 5AC抑制的效果 脑转移瘤，目的是开发针对脑转移瘤的潜在治疗方案， 转移总的来说，这项研究的结果将有助于确定肺癌脑的治疗策略。 转移性患者。

Lung Cancer (LC) is the leading cause of cancer-related mortality in the world, accounting for ~24% of cancer- related deaths in both women and men. The predicted 5-year survival rate of non-small-cell lung cancer (NSCLC) is 21%. The high mortality rate of LC patients is attributed to the fact that they usually present at an advanced stage where treatment options are mostly palliative. Brain metastasis remains a major cause of morbidity and mortality in lung cancer. Approximately, 25-40% of NSCLC develop central nervous system (CNS) metastasis. Our recent studies have found that MUC5AC is overexpressed in NSCLC and is associated with poor prognosis. Further, Muc5ac is found to be overexpressed in lung tissues of a genetically engineered mouse model (GEMM) (KrasG12D; AdCre and KrasG12D; Trp53R172H/+; AdCre). We have shown that MUC5AC interacts with integrin β4 and leads to lung cancer cell metastasis by activating focal adhesion kinase (FAK). In addition, we observed that MUC5AC expression is increased in brain metastatic tissues of LC. Based on these studies, we hypothesize that MUC5AC is overexpressed in lung cancer and plays a central role in brain metastasis. To test this hypothesis, we propose three specific aims: Aim 1 will define the role of MUC5AC as a biomarker of brain metastasis and establish its clinicopathological significance in lung cancer brain metastases. In Aim 2, we will systemically delineate the molecular mechanisms of MUC5AC on the development of LC brain metastases. It will highlight the mechanistic and functional significance of MUC5AC/integrin β4 axis in cellular adhesion, progression and metastasis of LC and will identify the presence of MUC5AC in exosomes and its role in metastasis. Finally, Aim 3 will identify the biology of MUC5AC mediated brain metastasis and impact of MUC5AC inhibition, using GEMM models. In this aim, we will use our GEM model and decipher the molecular signature and progression and metastasis of lung tumors in the presence and absence of Muc5ac. We will also isolate tumoroid or exosomes from lung cancer patients and GEMM model, including Muc5ac-/- mice to identify metastatic efficiency. We will use MUC5AC targeting antibodies to determine the effects of MUC5AC inhibition on brain metastases, with the goal of developing potential therapeutic options targeted towards brain metastases. Overall, the outcomes from the study will help to identify therapeutic strategies for lung cancer brain metastatic patients.