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Dynamic proteomic changes in tumor and immune organs reveal systemic immune response to tumor development.
Molecular & Cellular Proteomics : MCP 2024 March 29
In orthotopic mouse tumor models, tumor progression is a complex process, involving interactions among tumor cells, host cell derived stromal cells and immune cells. Much attention has been focused on the tumor and its tumor microenvironment, while the host's macroenvironment including immune organs in response to tumorigenesis is poorly understood. Here, we report a temporal proteomic analysis on a subcutaneous tumor and three immune organs (LN, MLN and spleen) collected on Days 0, 3, 7, 10, 14 and 21 after inoculation of mouse forestomach cancer (MFC) cells in a syngeneic mouse model. Bioinformatics analysis identified key biological processes during distinct tumor development phases, including an initial acute immune response, the attack by the host immune system, followed by the adaptive immune activation and the build-up of extracellular matrix. Proteomic changes in LN and spleen largely recapitulated the dynamics of the immune response in the tumor, consistent with an acute defense response on D3, adaptive immune response on D10 and the immune evasion by D21. In contrast, the immune response in MLN showed a gradual and sustained activation, suggesting a delayed response from a distal immune organ. Combined analyses of tumors and host immune organs allowed the identification of potential therapeutic targets. A proof-of concept experiment demonstrated that significant growth reduction can be achieved by dual inhibition of MEK and DDR2. Together, our temporal proteomic dataset of tumors and immune organs provides a useful resource to understand the interaction between tumors and the immune system, and has the potential for identifying new therapeutic targets for cancer treatment.
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