ARN-3236 is an orally active and selective inhibitor of salt-inducible kinase 2 (SIK2), with IC50 values of <1 nM for SIK2, 21.63 nM for SIK1, and 6.63 nM for SIK3. ARN-3236 exhibits anti-cancer activity.

SIK2:<1 nM , SIK1:21.63 nM , SIK3:6.63.nM

Salt-inducible kinase 2 (SIK2) is overexpressed in approximately 30% of high-grade serous ovarian cancers.?ARN-3236 inhibited the growth of 10 ovarian cancer cell lines at an IC50 of 0.8 to 2.6 μmol/L, where the IC50 of ARN-3236 was inversely correlated with endogenous SIK2 expression (Pearson r = -0.642, P = 0.03).?ARN-3236 enhanced sensitivity to paclitaxel in 8 of 10 cell lines, as well as in SKOv3ip (P = 0.028) and OVCAR8 xenografts.?In at least three cell lines, a synergistic interaction was observed.?ARN-3236 uncoupled the centrosome from the nucleus in interphase, blocked centrosome separation in mitosis, caused prometaphase arrest, and induced apoptotic cell death and tetraploidy.?ARN-3236 also inhibited AKT phosphorylation and attenuated survivin expression.

SIK2 expression was determined in ovarian cancer tissue samples and cell lines.?ARN-3236 was tested for its efficiency to inhibit growth and enhance paclitaxel sensitivity in cultures and xenografts of ovarian cancer cell lines.?SIK2 siRNA and ARN-3236 were compared for their ability to produce nuclear-centrosome dissociation, inhibit centrosome splitting, block mitotic progression, induce tetraploidy, trigger apoptotic cell death and reduce AKT/survivin signaling.