| First Author | Nabeyama A | Year | 2010 |
| Journal | Proc Natl Acad Sci U S A | Volume | 107 |
| Issue | 14 | Pages | 6436-41 |
| PubMed ID | 20308543 | Mgi Jnum | J:159323 |
| Mgi Id | MGI:4442296 | Doi | 10.1073/pnas.0912827107 |
| Citation | Nabeyama A, et al. (2010) xCT deficiency accelerates chemically induced tumorigenesis. Proc Natl Acad Sci U S A 107(14):6436-41 |
| abstractText | During the course of inflammation and its resolution, macrophages are exposed to various cytotoxic materials, including reactive oxygen species. Thus, macrophages require a protective machinery against oxidative stress to survive at the inflammatory site. Here, we showed that xCT, a component of transport system x(c)(-), was significantly up-regulated in activated infiltrating cells, including macrophages and neutrophils at the inflammatory site. System x(c)(-) mediates the uptake of extracellular L-cystine and is consequently responsible for maintenance of intracellular glutathione levels. We established a loss-of-function mouse mutant line of xCT by N-ethyl-N-nitrosourea mutagenesis. Macrophages from xCT(mu/mu) mice showed cell death in association with the excessive release of high mobility group box chromosomal protein 1 upon stimulation with LPS, suggesting that xCT deficiency causes unremitting inflammation because of the impaired survival of activated macrophages at the inflammatory site. Subcutaneous injection of 3-methylcholanthrene (3-MCA) induced the generation of fibrosarcoma in association with inflammation. When 3-MCA was injected s.c. into mice, xCT mRNA was up-regulated in situ. In xCT(mu/mu) mice, inflammatory cytokines (such as IL-1beta and TNFalpha) were overexpressed, and the generation of 3-MCA-induced fibrosarcoma was accelerated. These results clearly indicate that the defect of the protective system against oxidative stress impaired survival of activated macrophages and subsequently enhanced tumorigenecity. |
