(1)H, (13)C and (15)N resonance assignment of WHEP domains of human glutamyl-prolyl tRNA synthetase

Dexamethasone treatment upregulates glutamyl prolyl tRNA synthetase expression in liver tissue of rats with severe acute pancreatitis-associated liver injury

AIM: To investigate the effect of dexamethasone (DEX) on the expression of glutamyl prolyl tRNA synthetase (EPRS) in liver tissue of rats with severe acute pancreatitis (SAP)-associated liver injury.

METHODS: Ninety-six SD rats were randomly divided into an SAP model group, a sham operation (SO) group, and a DEX treatment group. Sodium taurocholate was used to induce SAP in rats of the model group and DEX group. Dexamethasone was given by intramuscular injection at 0.5 mg/100 g in the DEX group. Rats in each group were killed at different points (2, 6, 12, and 24 h) after treatment for further analysis. HE staining was used to observe liver damage. Serum amylase (AMS) content was measured by iodine colorimetric method. ELISA was used to detect the expression of liver nuclear factor κB (NF-κB) and interferon-γ (IFN-γ). The expression of EPRS was detected by immunohistochemical staining.

RESULTS: The SAP group suffered more severe inflammatory exudation than the SO group as revealed by liver HE staining. The DEX group had a decreased pathological score compared with the SAP group (P = 0.025). Serum AMS was significantly lower in the DEX group than in the SAP group (P = 0.0013). NF-κB expression at 6 h was significantly lower (P = 0.047), but IFN-γ expression at 6 h was significantly higher in the DEX group than in the SAP group (P = 0.038). The DEX group had significantly increased EPRS expression at 6 h as shown by immunohistochemistry (P < 0.01).

CONCLUSION: Hepatic EPRS expression is increased at 6 h after dexamethasone treatment in SAP rats.