期刊
GENES & DEVELOPMENT
卷 28, 期 19, 页码 2134-2150出版社
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.249599.114
关键词
cell invasion; cell migration; tumor microenvironment; protease
资金
- National Cancer Institute [NIH R01-CA125162]
- American Cancer Society [RSG-12-076-01-LIB]
- MSKCC Brain Tumor Center
- American Brain Tumor Association
- Geoffrey Beene fellowship
- Deutsche Forschungsgemeinschaft
- Weill-Cornell Medical School
- Gerstner Sloan-Kettering Graduate School
- [SFB 850]
During the process of tumor progression, cancer cells can produce the requisite growth- and invasion-promoting factors and can also rely on noncancerous cells in the tumor microenvironment as an alternative, cell-extrinsic source. However, whether the cellular source influences the function of such tumor-promoting factors remains an open question. Here, we examined the roles of the cathepsin Z (CtsZ) protease, which is provided by both cancer cells and macrophages in pancreatic neuroendocrine tumors in humans and mice. We found that tumor proliferation was exclusively regulated by cancer cell-intrinsic functions of CtsZ, whereas tumor invasion required contributions from both macrophages and cancer cells. Interestingly, several of the tumor-promoting functions of CtsZ were not dependent on its described catalytic activity but instead were mediated via the Arg-Gly-Asp (RGD) motif in the enzyme prodomain, which regulated interactions with integrins and the extracellular matrix. Together, these results underscore the complexity of interactions within the tumor microenvironment and indicate that cellular source can indeed impact molecular function.
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