Allosteric p97 Inhibitors Can Overcome Resistance to ATP‐Competitive p97 Inhibitors for Potential Anticancer Therapy. (23rd March 2020)

• Record Type: Journal Article
• Authors: Wang., Feng; Li, Shan; Gan, Taiping; Stott, Gordon M.; Flint, Andrew; Chou, Tsui‐Fen
• Is Part Of: ChemMedChem. Volume 15:Number 8(2020)
• Page Start: 685
• Page End: 694
• Publication Date: 2020-03-23
• Subjects: p97 VCP -- resistance -- small-molecule inhibitors -- ATPase -- biological activity -- cancer; Pharmaceutical chemistry -- Periodicals; 615.19005
• DOI: 10.1002/cmdc.201900722
• Languages: English
• ISSNs: 1860-7179

Abstract

Abstract: Abstract : A major challenge of targeted cancer therapy is the selection for drug‐resistant mutations in tumor cells leading to loss of treatment effectiveness. p97/VCP is central regulator of protein homeostasis and a promising anticancer target because of its vital role in cell growth and survival. One ATP‐competitive p97 inhibitor, CB‐5083, has entered clinical trials. Selective pressure on HCT116 cells dosed with CB‐5083 identified five different resistant mutants. Identification of p97 inhibitors with different mechanisms of action would offer the potential to overcome this class of resistance mutations. Our results demonstrate that two CB‐5083 resistant p97 mutants, N660 K and T688 A, were also resistant to several other ATP‐competitive p97 inhibitors, whereas inhibition by two allosteric p97 inhibitors NMS‐873 and UPCDC‐30245 were unaffected by these mutations. We also established a CB‐5083 resistant cell line that harbors a new p97 double mutation (D649 A/T688 A). While CB‐5083, NMS‐873, and UPCDC‐30245 all effectively inhibited proliferation of the parental HCT116 cell line, NMS‐873 and UPCDC‐30245 were 30‐fold more potent in inhibiting the CB‐5083 resistant D649 A/T688 A double mutant than CB‐5083. Our results suggest that allosteric p97 inhibitors are promising alternatives when resistance to ATP‐competitive p97 inhibitors arises during anticancer treatment. Abstract : Win without competing ! We established a new CB‐5083‐resistant HCT116 cell line and demonstrate that compounds NMS‐873 and UPCDC‐30245 exhibit 30‐fold higher potency in inhibiting its proliferation than CB‐5083. Our studies indicate that allosteric p97 inhibitors are promising alternatives to overcome resistance to ATP‐competitive p97 inhibitors.