Changes of blood natural killer cell,T lymphocyte subsets,IL-2,IL-4 and INF-γ in children with viral pneumonia
- VernacularTitle:病毒性肺炎患儿自然杀伤细胞亚群、T细胞亚群及血IL-2、IL-4、INF-γ变化的研究
- Author:
Degen HE
;
Lin ZHANG
- Publication Type:Journal Article
- Keywords:
Viral infection;
Pneumonia;
Immune function
- From:
Chinese Pediatric Emergency Medicine
2008;15(6):549-552
- CountryChina
- Language:Chinese
-
Abstract:
Objective To observe the changes of NK cell subset (CD56+,CD16+CD56+,CD16+),T cell subset (CD4+,CD8+,CD4+/CD8+) counts and related cytokines (IL-2,IL-4,INF-γ) in children with viral pneumonia.Methods Thirty-two children with viral pneumonia in acute stage (within 2 days after pneumonia onset) and recovery phase (within the range of the third to the fifth day after pneumonia onset) were included in this study.Peripheral blood NK cell subsets and T cell substes were determined by the flow cytometry.Blood IL-2,IL-4 and INF-γ were detected by ELISA.NK cytoactivity was measured by LDH release method.Results (1) The levels of the CD16+CD56+ and CD16+NK cell counting in acute stage [(0.73±0.17)% and (0.39±0.20)%] were lower than those in the recovery phase [(1.47±0.22)% and (0.89±0.14)%],which showed significant difference (P<0.01),however the level of CD16+CD56+ and CD16+NK cell counting either in acute stage or recovery phase was significantly lower than those of healthy control group (P<0.01).The sub population counting and NK cell activity was directly correlated.CD56+NK cell counting showed no significant difference between viral pneumonia group and control group (P>0.05).(2) There was no significant difference in blood IL-2 and IL-4 level between viral pneumonia group (either in acute stage or recovery phase) and the control group (P>0.05).As compared with that of the control group,blood INF-γ level of viral pneumonia group showed no significant change in acute stage (P>0.05),but INF-γ level in recovery phase [(28.10±1.38)?μg/L] was higher than that in acute stage [(22.78±1.19)?μg/L] and there was significant difference (P<0.01).(3) As compared with that of the control group,CD4+ and CD4+/CD8+T cell counting of viral pneumonia group showed no obvious changes either in acute stage or recovery phase (P>0.05).CD8+T cell counting of both two stages were much lower than that of the control group (P<0.05),but there was no significant difference between the two stages (P>0.05).Conclusion The NK cell activity in children with viral pneumonia decline obviously,which might be related to the changes of T cell subsets;the activity of suppressor T cell was depressed in patients with viral pneumonia.There are maybe many factors involved in the NK cell activation.
