Role of O-GlcNAc protein modification in attenuation of brain damage by glutamine in septic rats / 中华麻醉学杂志

ABSTRACT

Objective To evaluate the role of O-GlcNAc protein modification in attenuation of brain damage by glutamine in septic rats.Methods Sixty male SD rata weighing 180-240 g were randomly divided into 4 groupssham operation group(group S,n =12),sepsis group(group CLP,n =16),glutamine group(group G,n =16),an inhibitor of O-linked-N-acetyl glucosamine transferase Alloxan + glutamine group(group G + A,n =16).Rats were submitted to sepsis by cecal ligation and perforation(CLP).Glutamine(Gln)0.75 g/kg was injected iv after CLP in group G.Gln 0.75 g/kg was injected iv and Alloxan 90 mg/kg was injected ip after CLP in group G + A.Equal volume of normal saline was given in group S and group CLP.A1 24 h afler CLP,the neural reflex score was evaluated,then rat was sacrificed.The brain was removed for measurement of brain water content,observation of histopathology and determination of O-GlcNAc-modified protein expression.Results Compared with group S,neural reflex score and brain water content were significantly increased in groups CLP,G and G + A(P ＜ 0.05).Compared with group CLP,neural reflex score and brain water content were significantly decreased in groups G and G + A(P ＜ 0.05),and the expression of O-GlcNAc-modified protein was upregulated in group G(P ＜ 0.05),Compared with groups G,neural reflex score and brain water content were significantly increased,and the expression of O-GlcNAc-modified protein downregulated in group G + A(P ＜ 0.05).There was no significant difference in O-GlcNAc-modified protein expression among groups S,CLP and G + A.Conclusion Glutamine attenuates brain damage through O-GlcNAc protein modification in septic rats.