Journal
SHOCK
Volume 31, Issue 2, Pages 178-184Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/SHK.0b013e318180feb8
Keywords
Aging; ALT; burn; IL-6; liver; LPS
Funding
- National Institutes of Health [R01 AG018859, AG018859-S1, F30 AG029724]
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Regard less of age, a marked elevation in circulating IL-6 levels correlates with increased mortality after injury or an inflammatory challenge. We previously reported that aged IL-6 knockout mice given LIPS have improved survival and reduced inflammatory response than LPS-treated aged wild type (WT) mice. Herein, we analyzed the effects of aging and IL-6 on the hepatic inflammatory response in two models of systemic injury: dorsal scald (burn) injury versus intraperitoneal LIPS administration. At 24 h after burn injury, circulating alanine aminotransferase and hepatic neutrophil accumulation were comparable regardless of age or IL-6 deficiency. However, at this same time point, these indicators of liver damage, in addition to hepatic levels of KC, a neutrophil chemoattractant, were increased in aged WT mice given LIPS relative to young WT mice given LIPS. The hepatic injury was drastically reduced in aged IL-6 knockout mice given LPS as compared with LPS-exposed aged WT mice. Our results suggest that the nature of the insult will determine the degree of remote injury in aged animals. In addition, the role of IL-6 as a contributing factor of tissue injury may be insult specific.
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