Cell experiment:

Human peripheral T cells are incubated with AS2521780 and anti-human CD28 (0.5 μg/mL). After 48 h incubation, cell proliferation is detected using a CellTiter-Glo Luminescent Cell Viability Assay[1].

Animal experiment:

AS2521780 or vehicle is orally administered twice daily from Day 1 to 24. On Day 25, the left hind paw of each rat is dissected above the ankle joint and fixed in 10% neutral buffered formalin. After decalcification, the paws are embedded in paraffin, sectioned longitudinally and stained with hematoxylin and eosin[1].

AS2521780 is a novel PKCθ selective inhibitor with an IC50 of 0.48 nM.

AS2521780 exerts potent inhibition of recombinant human PKCθ enzyme activity (IC50=0.48 nM), which is more than 30-fold higher than that of other PKC isoforms. Further, AS2521780 exerts little or no inhibition on other protein kinases. AS2521780 suppresses CD3/CD28-induced Interleukin-2 (IL-2) gene transcription in Jurkat T cells and proliferation of human primary T cells. AS2521780 also suppresses concanavalin A-induced cytokine production by rat splenocytes and monkey peripheral blood mononuclear cells with similar potency[1].

AS2521780 significantly reduces paw swelling in a dose-dependent manner in a rat model of adjuvant-induced arthritis[1].

[1]. Fukahori H, et al. Effect of AS2521780, a novel PKCθ selective inhibitor, on T cell-mediated immunity. Eur J Pharmacol. 2014 Dec 15;745:217-22.