Temporal Associations of Plasma Levels of the Secreted Phospholipase A 2 Family and Mortality in Severe COVID-19.

Previous research suggests that group IIA secreted phospholipase A (sPLA -IIA) plays a role in and predicts severe COVID-19 disease. The current study reanalyzed a longitudinal proteomic data set to determine the temporal (days 0, 3 and 7) relationship between the levels of several members of a family of sPLA isoforms and the severity of COVID-19 in 214 ICU patients. The levels of six secreted PLA isoforms, sPLA -IIA, sPLA -V, sPLA -X, sPLA -IB, sPLA -IIC, and sPLA -XVI, increased over the first 7 ICU days in those who succumbed to the disease. sPLA -IIA outperformed top ranked cytokines and chemokines as predictors of patient outcome. A decision tree corroborated these results with day 0 to day 3 kinetic changes of sPLA -IIA that separated the death and severe categories from the mild category and increases from day 3 to day 7 significantly enriched the lethal category. In contrast, there was a time-dependent decrease in sPLA -IID and sPLA -XIIB in patients with severe or lethal disease, and these two isoforms were at higher levels in mild patients. Taken together, proteomic analysis revealed temporal sPLA patterns that reflect the critical roles of sPLA isoforms in severe COVID-19 disease.