(S)-Selisistat

(S)-Selisistat ((S)-EX-527) is a potent and selective SIRT1 inhibitor, with an IC₅₀ of 98 nM. IC50 & Target:IC50: 123 nM (SIRT1)^[1] In Vitro: (S)-Selisistat is an inhibitor of SIRT1 enzymatic activity (IC₅₀, 98 nM), identified in a high-throughput screen using bacterially expressed human SIRT1. (S)-Selisistat inhibits SIRT1 in a concentration-dependent manner with an IC₅₀ of 38 nM, in agreement with the activity on bacterially expressed SIRT1. (S)-Selisistat has much lower potency against SIRT2 (IC₅₀, 19.6 μM) or SIRT3 (IC₅₀, 48.7 μM) but does not inhibit class I/II HDAC activity at concentrations up to 100 μM^[1]. (S)-Selisistat exerts an inhibitory effect on SIRT1 activity without affecting SIRT1 expression on both mRNA and protein levels^[2]. In Vivo: (S)-Selisistat abolishes Resveratrol (RSV)-induced attenuation of microvascular inflammation in ob/ob septic mice. Finally, ob/ob mice in Sepsis+RSV group has significantly increased 7-day survival vs. Sepsis+Vehicle group^[3].