[A kinetic study on the relationship between of IL-5, IL-10 and eosinophil apoptosis in asthmatic airway inflammation].
OBJECTIVE
To observe time-course profile of eosinophil apoptosis, in murine asthma models in airway explicate its implication for asthmatic inflammation remission, and investigate the role of IL-5 and IL-10 in modulating cell apoptosis.


METHODS
An animal model of asthma was established by OVA sensitizing-challenging BALB/c mice. Histologic study of lung tissue was made with the use of electronmicroscope. At seven points (0 h, 8 h, 24 h, 48 h, 96 h, Day 7 and Day 14) in the time course after challenge, bronchoalveolar lavage (BAL) was performed obtain BAL cells and recover fluid. Levels of IL-5 and IL-10 were detected by ELISA. Cell apoptosis was assayed by PI stain on a flow cytometer.


RESULTS
After challenge, apoptosis of eosinophils, lymphocytes, endothelial cells could be seen under the electronmicroscope. IL-5 in BALF elevated significantly whereas no significant difference was found between the levels of IL-10 in BALF before and after challenge. Eosinophil apoptosis was identified and a two-phase elevation of apoptosis percentages was observed, although no significant difference was found between average apoptosis in asthmatic group and that in control. Data analyses revealed a negative correlation between apoptosis percentages and the levels of IL-5, and a closer correlation between the percentages and IL-5/IL-10 ratio.


CONCLUSIONS
IL-5 and IL-10 could up- and down-regulate asthmatic airway inflammation, respectively. EOS underwent apoptosis in situ and this was modulated by IL-5 and IL-10 interaction.
Liu
C
C
Department of Respirology, First Affiliated Hospital, WCUMS, Chengdu 610041, China.
Wang
Z
Z
Feng
Y
Y
Lei
S
S
D000818:Animals; D017209:Apoptosis; D001249:Asthma / Q000150:complications / Q000378:metabolism / Q000473:pathology*; D001991:Bronchitis / Q000150:complications / Q000473:pathology*; D004804:Eosinophils / Q000473:pathology*; D005260:Female; D016753:Interleukin-10 / Q000378:metabolism; D015848:Interleukin-5 / Q000378:metabolism*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D011897:Random Allocation
D015848:Interleukin-5; D016753:Interleukin-10