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The Journal of Immunology, Vol 155, Issue 12 5743-5749, Copyright © 1995 by American Association of Immunologists
ARTICLES |
T Arai, K Hiromatsu, N Kobayashi, M Takano, H Ishida, Y Nimura and Y Yoshikai
Laboratory of Host Defense and Germfree Life, Nagoya University School of Medicine, Japan.
The effects of exogenous cAMP, dibutyryl cAMP (DBcAMP) on LPS-induced liver injury were examined in mice made hypersensitive to LPS by treatment with i.v. injection of Propionibacterium acnes. In vivo administration of DBcAMP significantly protected P. acnes-treated mice from LPS-induced liver injury, including apoptosis of hepatocytes. DBcAMP significantly increased circulating IL-10 level in correlation with suppression of the TNF-alpha level after LPS challenge in P. acnes- treated mice. Treatment with anti-IL-10 mAb abrogated the protective effect of DBcAMP on LPS-induced liver injury. Similar to in vivo findings, addition to DBcAMP to in vitro culture of liver adherent cells from P. acnes-treated mice enhanced IL-10 synthesis after LPS stimulation. These results suggest that the increment in IL-10 production by liver adherent cells is involved in the protective effect of DBcAMP on LPS-induced inflammatory liver injury.
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