Abstract
Aim:
To determine whether glycine could downregulate interleukin 1 receptor associated kinase-4 (IRAK-4) expression to interfere with lipopolysaccharides (LPS) signal transduction and blunt transplantative liver ischemia-reperfusion injury (I/RI).
Methods:
SD rats were randomly divided into two groups: donor animals of the glycine group (n=40) were given glycine (1.5 mL; 300 mmol/L, iv) 1 h before harvest, and the control group were treated with 1.5 mL physiological saline (n=40). Orthotropic liver transplantation was then performed according to the Kamada technique. Ten animals in each group were followed up for 7 d after surgery to assess survival. The remaining animals in each group were divided into 3 subgroups (n=10) at 1h, 2 h and 6 h after portal vein reperfusion. Levels of LPS, serum aspartate aminotransferase (AST), alanine aminotransferase (ALT) and total bilirubin in portal circulation, as well as IRAK-4 and TNF-α expression, NF-κB transcriptional activity and morphological study of liver tissues were analyzed.
Results:
Reperfusion resulted in a significant elevation of LPS concentrations in each group persisting to the end of our study. However, glycine, which led to improved survival rate and liver function, significantly alleviated liver parenchyma cell damage by downregulating IRAK-4, TNF-α expression and NF-κB transcriptional activity compared with the control group.
Conclusion:
Glycine can attenuate hepatic I/RI by downregulating IRAK-4 to interfere with LPS signal transduction.
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Project supported by the National Natural Science Foundation of China (No 30471696, 30500473), the PhD Programs Foundation of Ministry of Education of China (No 20050631001) and the Natural Science Foundation of Chongqing (No 2005BB5242).
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Liu, Zj., Yan, Ln., Li, Sw. et al. Glycine blunts transplantative liver ischemia-reperfusion injury by downregulating interleukin 1 receptor associated kinase-4. Acta Pharmacol Sin 27, 1479–1486 (2006). https://doi.org/10.1111/j.1745-7254.2006.00413.x
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DOI: https://doi.org/10.1111/j.1745-7254.2006.00413.x
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