Biological Activity
cb-5083 is an orally bioavailable inhibitor of p97. p97 is an aaa-atpase involved in multiple cellular functions such as organelle membrane homotypic fusion and sorting of endosomal cargo. p97 is also known as valosin-containing protein which plays important roles in regulating protein homeostasis [1].
in vitro
cb-5083 is a selective potent inhibitor of p97’s second atpase domain. cb-5083 might compete with atp for the same binding site but may adopt a different orientation[2]. the ic50 of cb-5083 against wild-type (wt) p97 was 15.4 nm. cb-5083 could dose-dependently increase the cytosolic protein degradation in hek293t, a549 and hct116 cell lines [1]. cb-5083 treatment (2.5 μm) of a549 cells for 24h could induce cancer cell death [1].
in vivo
in female nude mice bearing hct116, a549 lung carcinoma, and amo-1 multiple myeloma xenograft tumors, oral administration of cb-5083 (100 mg/kg) for 6 h showed a significant antitumor response in tumors (tgi = 63%, p < 0.0001) [1,2].
References
anderson d j, le moigne r, djakovic s, et al. targeting the aaa atpase p97 as an approach to treat cancer through disruption of protein homeostasis[j]. cancer cell, 2015, 28(5): 653-665.zhou h j, wang j, yao b, et al. discovery of a first-in-class, potent, selective, and orally bioavailable inhibitor of the p97 aaa atpase (cb-5083)[j]. journal of medicinal chemistry, 2015, 58(24): 9480-9497.
