Project Details
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Validation of ADAM8 as a therapeutic target in highly invasive tumors and in metastasis

Subject Area Cell Biology
Biochemistry
Hematology, Oncology
Term from 2016 to 2024
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 318768680
 
Final Report Year 2025

Final Report Abstract

In this project, significant insights were gained about the role of ADAM8 in tumors and metastases. Throughout the project, it became clear that ADAM8 is present not only in tumor cells but also in immune cells of the tumor microenvironment, where it can play an important role in tumor progression. This is especially evident in the ADAM8-mediated migration of immune cells, primarily neutrophilic granulocytes (neutrophils), which can have a tumor-promoting effect. The effects of ADAM8 in the tumor microenvironment lead to increased expression of the matrix metalloproteinase MMP-9 and the protein SPP1/Osteopontin, which is important for angiogenesis—two key proteins that can be regulated by ADAM8. ADAM8 is localized in extracellular vesicles as an active protease and can transfer the expression of MMP-9 and SPP1 from one cell to another by transporting microRNAs in ADAM8-positive vesicles. We were able to demonstrate that the effects of ADAM8 on tumor progression are less related to the active metalloprotease domain but are instead mediated by the cytoplasmic domain of ADAM8. This insight shifted the focus of the project somewhat, as inhibiting the metalloprotease appeared to be less important than understanding the mechanism by which ADAM8 can mediate intracellular signal transduction. It was shown that the intracellular activity of STAT3 is regulated by ADAM8. This regulation occurs through a miRNA, miR181a-5p, a tumor-suppressor miRNA, whose expression can be directly suppressed by ADAM8. miR181a-5p negatively regulates the expression of NEAT1, a long non-coding RNA. NEAT1 can then influence the stability of STAT3 by directly binding to it, preventing the NEAT1-STAT3 complex from being degraded in the proteasome. Thus, we have described a non-canonical function for an ADAM protease that, in this form and level of detail, was previously unknown.

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