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Correlation between sPLA2-IIA and phosgene-induced rat acute lung injury.
Inhalation Toxicology 2009 Februrary
Secreted phospholipase A(2) of group IIA (sPLA(2)-IIA) has been involved in a variety of inflammatory diseases, including acute lung injury. However, the specific role of sPLA(2)-IIA in phosgene-induced acute lung injury remains unidentified. The aim of the present study was to investigate the correlation between sPLA(2)-IIA activity and the severity of phosgene-induced acute lung injury. Adult male rats were randomly exposed to either normal room air (control group) or a concentration of 400 ppm phosgene (phosgene-exposed group) for there are 5 phosgene-exposed groups altogether. For the time points of 1, 3, 6, 12 and 24 h post-exposure, one phosgene-exposed group was sacrificed at each time point. The severity of acute lung injury was assessed by Pa(O2)/F(IO2) ratio, wet-to-dry lung-weight ratio, and bronchoalveolar lavage (BAL) fluid protein concentration. sPLA(2)-IIA activity in BAL fluid markedly increased between 1 h and 12 h after phosgene exposure, and reached its highest level at 6 h. Moreover, the trend of this elevation correlated well with the severity of lung injury. These results indicate that sPLA(2)-IIA probably participates in phosgene-induced acute lung injury.
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