Eicosanoid modulation by
butyrate has been reported in various cells and conditions. Recently, comprehensive analyses of
lipid mediators using liquid chromatography/tandem mass spectrometry has been reported. We hypothesized that
tributyrin, a
prodrug of
butyrate, may attenuate LPS-induced liver injury in rats by suppressing the production of pro-inflammatory
lipid mediators and/or by inducing anti-inflammatory specialized proresolving mediators. To test this, groups of Wistar rats were orally administered
tributyrin (1 g/kg
body weight) or vehicle 1 h before
intraperitoneal injection of LPS. The livers were collected at 0, 1.5, 6, and 24 h later and analyzed:
lipid mediators were profiled by liquid chromatography/tandem mass spectrometry; expression of
cyclooxygenase-2,
5-lipoxygenase (LOX), 12/15-LOX, and
leukotriene (LT) A4
hydrolase, and nuclear translocation of 5-LOX were evaluated by western blot analysis; and induction of liver injury was assessed by immunostaining for
8-hydroxy-2'-deoxyguanosine, an
indicator of oxidative DNA damage. We found that
tributyrin treatment attenuated LPS-induced production of pro-inflammatory
LTB4 (p < 0.05) and decreased oxidative stress levels in the liver.
Tributyrin also attenuated the nuclear translocation of 5-LOX in response to LPS, suggesting a possible mechanism for the
LTB4 reduction. LPS-induced changes in other
lipid mediators were not significantly affected by
tributyrin treatment up to 24 h after LPS injection. Our results suggest that oral
tributyrin administration protects against
endotoxemia-associated liver damage by reducing production of the pro-inflammatory
eicosanoid LTB4.