Stromal Fibroblast Autophagy In Tumor Progression and Desmoplasia

肿瘤进展和结缔组织形成中的基质成纤维细胞自噬

基本信息

批准号：
10058245
负责人：
Jayanta Debnath
金额：
$ 32.89万
依托单位：
UNIVERSITY OF CALIFORNIA, SAN FRANCISCO
依托单位国家：
美国
项目类别：
财政年份：
2017
资助国家：
美国
起止时间：
2017-12-13 至 2022-11-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10058245
关键词：
Affect Angiogenic Factor Animals Autophagocytosis Behavior Biological Biological Assay Breast Cancer Model Carcinoma Cell Proliferation Cell Survival Cell secretion Cells Cellular Metabolic Process Clinical Collagen Collagen Type I Data Deposition Desmoplastic Eating Epithelial Exhibits Exposure to Extracellular Matrix Fibroblasts Fibrosis Genetic Growth Factor Histologic Human Hypoxia Immune Immunocompetent Impairment In Vitro Inflammation Invaded Laboratories Lead LoxP-flanked allele Malignant Neoplasms Mammary Neoplasms Metabolic Modeling Molecular Mus Neoplasm Metastasis Nutrient Pathway interactions Peptide Hydrolases Polyomavirus Primary Neoplasm Process Prognosis Publishing Role Solid Neoplasm Starvation Stress Stromal Cells Testing Therapeutic Tissues Transgenic Mice Transgenic Model base cancer cell cell behavior cell type cytokine in vivo inhibition of autophagy innovation insight interest neoplastic cell promoter recruit response therapeutic target tool tumor tumor growth tumor microenvironment tumor progression tumorigenic wound healing

项目摘要

PROJECT SUMMARY Carcinoma progression depends on the interactions of epithelial tumor cells with their surrounding stroma. Fibroblasts represent a principal component of this stroma, which modulates tumor cell behavior through diverse mechanisms, including the synthesis of growth and angiogenic factors, cytokines, extracellular matrix components and proteases. Indeed, many solid tumors exhibit striking histological evidence of fibroblast proliferation and activation, termed desmoplasia. Although desmoplasia in human cancers tightly correlates with poor prognosis, the molecular mechanisms that generate and maintain this desmoplastic response remain unknown. In preliminary studies, we have uncovered that autophagy in stromal fibroblasts is crucial for promoting both desmoplasia and tumor progression. Autophagy is a tightly regulated lysosomal degradation process that promotes tumor cell survival and metabolic adaptation. There is great interest in targeting autophagy against cancer due to its well-established effects on tumor cell survival; however, the potential pro- tumorigenic functions of autophagy in the host stroma remain unknown. We hypothesize that autophagy in stromal fibroblasts is critical to initiate and maintain a desmoplastic fibrotic response and to facilitate tumor progression. Using powerful immune-competent mammary cancer models and tools uniquely developed in our laboratory, we will rigorously scrutinize the functions of stromal fibroblast autophagy during cancer progression in vivo. In Aim 1, we will determine how autophagy in stromal fibroblasts modulates tissue stiffness and ECM remodeling. In Aim 2, we will dissect how autophagy-dependent secretion by stromal fibroblasts promotes carcinoma progression and influences the tumor microenvironment. In Aim 3, we will corroborate the effects of stromal fibroblast autophagy in mammary cancer progression and metastasis using autochthonous tumor models. These studies will provide unique conceptual insight into whether and how the autophagy pathway in host fibroblasts can be modulated to abolish the stromal response required for cancer progression.

项目摘要癌的进展取决于上皮肿瘤细胞与周围基质的相互作用。成纤维细胞代表该基质的主要成分，该基质通过多种机制，包括生长和血管生成因子的合成，细胞因子，细胞外基质成分和蛋白酶。实际上，许多实体瘤表现出醒目的成纤维细胞的组织学证据增殖和激活，称为脱木质。虽然人类癌症中的脱木质紧密相关预后不良，产生和维持这种脱糖反应的分子机制仍然存在未知。在初步研究中，我们发现基质成纤维细胞的自噬对于促进脱木质和肿瘤进展。自噬是严格调节的溶酶体降解促进肿瘤细胞存活和代谢适应的过程。目标很感兴趣自噬对癌症的自动噬对肿瘤细胞存活的影响很大；但是，潜在的利益自噬在宿主基质中的肿瘤功能仍然未知。我们假设在基质成纤维细胞对于启动和维持去肿瘤的纤维化反应至关重要并促进肿瘤进展。使用强大的免疫能力乳腺癌模型和工具在我们的实验室，我们将严格审查癌症进展过程中基质成纤维细胞自噬的功能体内。在AIM 1中，我们将确定基质成纤维细胞中的自噬如何调节组织刚度和ECM 重塑。在AIM 2中，我们将剖析基质成纤维细胞的自噬依赖性分泌如何促进癌的进展并影响肿瘤微环境。在AIM 3中，我们将证实乳腺癌进展和转移的基质成纤维细胞自噬，使用自自肿瘤型号。这些研究将提供独特的概念见解，了解自动途径是否以及如何可以调节宿主成纤维细胞以消除癌症进展所需的基质反应。