Improved secretion of recombinant human IL-25 in HEK293 cells using a signal peptide-pro-peptide domain derived from Trypsin-1

To compare the effects of human Trypsin-1 signal peptide and pro-peptide on the expression and secretion efficiency of human Interleukin-25 from mammalian cells. The signal peptide and combined signal peptide-pro-peptide sequence of human Trypsin-1 improved the secretion of human IL-25 from 1.7 to 3.2 µg/ml and 1.7 to 8.2 µg/ml, respectively. Deletion analysis identified the minimal Trypsin-1 derived secretion domain that maintains improved human Interleukin-25 production and secretion. The presence of Trypsin-1 pro-peptide sequence does not affect the function of secreted human Interleukin-25. The Trypsin-1 signal peptide-pro-peptide sequence increased human IL-25 expression and secretion in mammalian cells by fivefold.