Abstract
Mice treated with lipopolysaccharide (LPS)/d-galactosamine (GalN) selectively develop hepatic failure. The acute-phase protein α1-acid glycoprotein (AGP) has been demonstrated to protect mice from LPS/GalN-induced lethality. Metallothionein (MT), which is a low-molecular weight, cysteine-rich, metal-binding protein, is also induced in the acute-phase reaction. However, the specific function of MT in acute-phase response remain to be elucidated. We showed that MT-null mice were more sensitive to LPS/GalN-induced lethality than wild-type mice. The increase in vital mediator levels, TNF-α and NO were of similar levels in wild-type and MT-null mice. A remarkable increase in plasma platelet-activating factor levels was not observed in our experimental conditions. On the other hands, the mRNA level of AGP in the response to LPS/GalN was decreased in MT-null mice compared to wild-type mice. These results indicated that MT may have the potential to prevent LPS/GalN-induced lethality, at least through the attenuation of AGP induction.
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