Effect of sFasL on the supernatant production of the Flag-tagged FasL constructs.

<p><u>Panels </u><u>A </u><u>to </u><u>D</u>: An increasing amount expressed in percentage, of the sFasL encoding plasmid, was co-transfected with a fixed amount of the plasmids encoding sfFasL (Panel A), pfFasL (Panel B), TCR-pfFasL (Panel C) and HLA-pfFasL (Panel D). The secreted proteins were quantified in culture supernatants using an ELISA specific for FasL (shaded histograms, right-hand scale) and for Flag-tagged FasL (curves, left-hand scale). For the Flag ELISA, the measured concentrations were normalized according to the condition lacking sFasL. Are presented the mean +/- sd of four independent transfection experiments. * 0.02≤p≤0.05; ** p≤0.02. Panel E : direct anti-FasL immunoblot analysis of identical volumes of the cell culture supernatant containing pfFasL produced alone and with 50% of the sFasL plasmid, after SDS-PAGE separation under reducing conditions.