HLMs were cultured in 24-well plates in RPMI 1640 medium supplemented with 5% FCS, 2 mM l-glutamine, and 1% antibiotic–antimycotic solution, as previously described [17 (link)]. HLMs were treated with TSLP and its proteolytic fragments for 16 h at 37 °C. At the end of incubations, the supernatants were collected and stored at −80 °C for subsequent ELISA quantification of VEGF-A. Cell lysis in the plates was carried out using 0.1% Triton X-100 for total protein quantification by a Bradford-based assay (Bio-Rad, Segrate, Milan, Italy).
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