A-Disintegrin and Metalloproteinase (ADAM) 17 Enzymatically Degrades Interferon-gamma.

ABSTRACT: Interferon-gamma (IFN-?) is a pleiotropic cytokine that exerts anti-tumor and anti-osteoclastogenic effects. Although transcriptional and post-transcriptional regulation of IFN-? is well understood, subsequent modifications of secreted IFN-? are not fully elucidated. Previous research indicates that some cancer cells escape immune surveillance and metastasize into bone tissue by inducing osteoclastic bone resorption. Peptidases of the a-disintegrin and metalloproteinase (ADAM) family are implicated in cancer cell proliferation and tumor progression. We hypothesized that the ADAM enzymes expressed by cancer cells degrades IFN-? and attenuates IFN-?-mediated anti-tumorigenic and anti-osteoclastogenic effects. Recombinant ADAM17 degraded IFN-? into small fragments. The addition of ADAM17 to the culture supernatant of stimulated mouse splenocytes decreased IFN-? concentration. However, ADAM17 inhibition in the stimulated mouse T-cells prevented IFN-? degradation. ADAM17-expressing human breast cancer cell lines MCF-7 and MDA-MB-453 also degraded recombinant IFN-?, but this was attenuated by ADAM17 inhibition. Degraded IFN-? lost the functionality including the inhibititory effect on osteoclastogenesis. This is the first study to demonstrate the extracellular proteolytic degradation of IFN-? by ADAM17. These results suggest that ADAM17-mediated degradation of IFN-? may block the anti-tumorigenic and anti-osteoclastogenic effects of IFN-?. ADAM17 inhibition may be useful for the treatment of attenuated cancer immune surveillance and/or bone metastases.

SUBMITTER: Kanzaki H 

PROVIDER: S-EPMC5004192 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature