Project Summary: Metastatic disease is a complex, dynamic and emergent process that requires collective and coordinated interactions between many cell types, metabolites and the host. There is substantial clinico- pathologic and experimental evidence for critical roles of neural innervation, lymphatic interactions, metabolites and endothelial cells in regulating metastatic progression by altering cancer and immune cell functions. As such, these cellular interactions likely shape metastatic progression, responses to therapy and metastatic dissemination. However, we have a limited understanding of how these components coordinately regulate metastatic progression. This application describes a series of highly innovative multidisciplinary molecular, cell- biological, metabolic, massively-parallel single-cell sequencing and organismal methods applied towards defining the dynamic and emergent mechanisms by which neural cells, lymphatics, immune cells and metabolites interact to coordinately regulate metastatic progression—contributing to a systems-level understanding of metastasis. We aim to (i) define the role of neural innervation on metastatic progression by characterizing neuro- tumor and neuro-immune interactions and identifying neural signals and their pro-metastatic mechanisms of action, (ii) determine how endothelial cells regulate innervation of metastatic tumors, (iii) define the role of regionalized lymphatic interactions in driving metastatic progression and anti-metastatic immunity, (iv) assess the role of neuro-immune and neuro-epithelial interactions on early metastatic dissemination and colonization, (v) identify metabolite and protein signals that drive metastatic colonization, (vi) discover tumoral transcription factors and RNA-binding proteins that act downstream of neural and metabolic signals to drive emergent pro- metastatic gene expression programs, and (vii) determine the impact of standard chemotherapy on these diverse cellular interactions and metabolic determinants of metastatic progression. Our proposed MetNet Center will enhance our understanding of how interactions and crosstalk between cancer cells with nervous system cells, lymphatics, vasculature and immune cells enables emergence of metastatic disease. We will also assess how therapy impacts specific cell-cell and metabolic interactions of metastatic cells and provide insights into the impact of specific cellular interactions in the primary microenvironment on metastatic dissemination, including early dissemination. These findings will generate an integrated, systems-level understanding of metastasis, enabling development of a new generation of anti-cancer therapies that prevent critical emergent coordinated pro-metastatic interactions.

Project Narrative The MetNet Center for Systems-level Study of Metastasis will elucidate how dynamic interactions between neuronal cells, localized lymphatics, metabolites and cancer cells collectively contribute to the emergence of metastatic disease—thereby identifying critical genes as therapeutic targets for its eradication.