The changes of serum apolipoprotein E in pediatric infectious diseases / 中华传染病杂志

ABSTRACT

ObjectiveTo investigate the changes of serum apolipoprotein E (ApoE) in children with infectious diseases.MethodsA total of 279 pediatric patients with infectious diseases were enrolled in this study,including 65 patients with sepsis,47 patients with bacterial meningitis,67 patients with bacterial pneumonia, 47 patients with aseptic meningitis and 53 patients with mycoplasmapneumonia. TheserumApoEcollectedfromallpatientswasdetectedby immunoturbidimetric assay (IA).The septic mouse model was established by intraperitoneal injection of group B Salmonella typhimurium.Mouse serum ApoE levels were detected by IA,and the hepatic ApoE mRNA and protein expressions of mice were detected by quantitative real-time reverse transcription-polymerase chain reaction (RT-PCR) and Western blot,respectively.Data in two groups were compared by independent-sample t test.ResultsSerum ApoE levels in patients with bacterial infections were increased dramatically,which was (59.8±23.5) mg/L in patients with sepsis (t=-5.118,P＜0.01),while no significant differences were found in patients with aseptic meningitis and myeoplasma pneumonia.Moreover,a high level of serum ApoE was detected in septic mouse model,while the hepatic ApoE mRNA and protein expressions of the mice were both decreased,with mRNA decreased 71％ at 3 hour (t=5.022,P＜0.01) and 73％ at 24 hour (t=4.181,P＜0.01).Conclusions Serum ApoE levels in bacterial infections increase dramatically,while its hepatic expression in septic mouse model is decreased,which indicates that the elevated serum ApoE level is not related to the changes of hepatic ApoE expression.