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Effects of low-dose irradiation on mice with Escherichia coli-induced sepsis
- Effects of low-dose irradiation on mice with Escherichia coli-induced sepsis
- Song K.-H.; Jung S.-Y.; Kho S.-H.; Hwang S.-G.; Ha H.; Nam S.Y.; Song J.-Y.
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- Toxicology and Applied Pharmacology
- vol. 333, pp. 17 - 25
- Antioxidant; Immune response; Inflammation; Low-dose irradiation; Sepsis
- Academic Press Inc.
- SCI; SCIE; SCOPUS
- Although favorable immune responses to low-dose irradiation (LDI) have been observed in normal mice, i.e., a hormesis effect, little is known about the effects of LDI in infectious diseases. In this study, we examined the effects of LDI on mice with sepsis, a severe and often lethal hyperinflammatory response to bacteria. Female C57BL/6 mice were whole-body irradiated with 10 cGy 48 h before Escherichia coli infection, and survival, bacterial clearance, cytokines, and antioxidants were quantified. LDI pretreatment significantly increased survival from 46.7% in control mice to 75% in mice with sepsis. The bacterial burden was significantly lower in the blood, spleen, and kidney of LDI-treated mice than in those of control septic mice. The levels of pro-inflammatory cytokines, e.g., IL-1β and IL-6, as well as anti-inflammatory IL-10 were markedly reduced in pre-LDI septic mice. Nitric oxide production by peritoneal macrophages was also reduced in pre-LDI septic mice. Immune cells in the spleen increased and Nrf2 and HO-1 were induced in pre-LDI septic mice. LDI stimulates the immune response and minimizes lethality in septic mice via enhanced bacterial clearance and reduced initial proinflammatory responses. © 2017 Elsevier Inc.
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