ABSTRACT
Objective To study the change of CD4+ CD25+ Foxp3high regulatory T cells (Treg cells) and the molecules associated with Treg cells in different immune status in infant with sepsis, and to further clarity the pathogenesis of disturbed immune function in infant with sepsis. Method Totally 36 sepsis infants admitted in In-tensive Care Unit of Shenzhen Children' s Hospital from May 2007 to November 2007 and 16 age-matched healthy infants were collected for prospective study, after excluding autoimmune disease, immunodeficiency, inherited metabolic disorders, tumor, and drug-treatment that could affect immune function during lately 6 months. The study was approved by Ethics Committee of Shenzhen Children's Hospital. The 36 infants with sepsis were divided into two groups according to expression levels of HLA-DR in CD14-positive cells: DR-H group was defined as patients with HLA-DR > 30%, while DR-L group was defined as patients with HLA-DR < 30%. Expression levels of HLA-DR in CD14-positive cells and the proportion of Treg cells were analyzed by flow cytometry. Real-time PCR were used to evaluate the mRNA levels of Foxp3, CTLA-4,GITR, and IL-10 in CD4-posidve ceils. Statistical analysis was performed by one-way Anova. There was statistical difference with P < 0.05. Results The proportion of Treg cells in DR-L group was found to be significantly higher than that in healthy control or DR-H group (P <0.05).Compared with healthy control group or DR-H group, transcriptional levels of Foxp3, CTLA-4 and IL-10were significantly increased in DR-L group (P <0.05). The levels of GITR mRNA in DR-L group were detected to be higher than those in DR-H group (P < 0.05). Conclusions Aberrant increased proportion of Treg cells may be associated with suppressed immune status in infant with sepsis.
ABSTRACT
Objective: To observe the effects and immunological mechanism of continuous blood(purification)(CBP) in treatment of children with infectious shock.Methods: Twelve children with infectious shock treated with continuous veno-venus hemofiltration(CVVH) in intensive care unit(ICU) from June 2002 to October 2005 were selected as CBP treatment group,and 20 children with infectious shock without the(treatment) were selected as controls at the same time.The levels of pH,oxygenation index,HCO~-_3,base(excess(BE)),blood urea nitrogen(BUN),serum creatinine(SCr),blood pressure and acute physiology and chronic health evaluation Ⅱ(APACHEⅡ) were examined before and 24,48 hours after treatment dynamically,while the levels of tumor necrosis factor?(TNF?),interleukin1(IL1),IL6 and IL8 were detected and analyzed by SPSS 10.0 software.Results: Among the 12 patients,8 cases survived,4 cases died and the mortality rate was 33.3%.In CBP treatment group,APACHE Ⅱdecreased after treatment,and other biochemical parameters were all improved,plasma concentrations of TNF?,IL1 and IL8 decreased(P