Antibody-mediated soluble CD14 stabilization prevents agitation-induced increases in presepsin levels in blood component specimens.

Presepsin is a 13-kDa N-terminal glycoprotein of CD14. Previously, agitation-induced increases in presepsin levels have been reported; however, the mechanism remains poorly understood. In this study, we aimed to reveal the mechanism of presepsin increase. The agitated plasma or serum was separated using gel exclusion chromatography and analyzed by ELISA. The effect of an anti-CD14 antibody (F1024-1-3) was examined. We observed elevated presepsin levels in the agitated plasma and aggregated soluble CD14 (sCD14). However, treatment with F1024-1-3 before agitation prevented the aggregation and the increase in presepsin levels. Depletion of aggregated sCD14 decreased the presepsin levels. Our findings indicate that agitation induces the aggregation of sCD14 and triggers an increase in presepsin. Anti-CD14 antibody prevents an increases in presepsin.