Comparing small molecule activity profiles using the LSC assay and the biochemical assay.
(A) The structures of the compounds compared to the parent screening active compound (NCGC00138783). (B) Biochemical (ALPHAScreen) SIRPα-CD47 antagonism activity of NCGC00138783 and the structurally related analogs shown in A were compared to (C) antagonism activity of SIRPα binding to CD47 expressed on live Jurkat cells in the LSC assay. Normalized activity calculated with neutral control (CD47 + SIRPα, no inhibitor) as 0% and negative control (CD47—SIRPα, no inhibitor) as -100% activity. Assay activity with tested agents was then compared and normalized to these controls.