LDE225 (NVP-LDE225,Erismodegib)

LDE225 is a potent and selective inhibitor of smoothened with IC50 values of 1.3nM in mouse and 2.5nM in human, respectively [1].

LDE225 is screened out from a high-throughput cell-based screen of in-house diversity combinatorial libraries and is developed to be an antagonist of Smo. Smo is an activator of the hedgehog(Hh) signaling pathway and aberrant activation links to tumorigenesis in several cancers. The antitumor efficacy of LDE225 has been evaluated in vivo. In the subcutaneous Ptch+/-p53-/- medulloblastoma allograft mouse model, LDE225 can significantly inhibit tumor growth at a dose of 5mg/kg/day. And in an orthotopic Ptch+/-p53-/- medulloblastoma allograft model, LDE225 is suggested to penetrate the blood-brain barrier in tumor-bearing animals and cause the tumor growth inhibition after 4 days of treatment. Additionally, the preclinical safety assays show that LDE225 has no genotoxicity and has good selectivity [1].

References:
[1] Shifeng Pan, Xu Wu, Jiqing Jiang, et al. Discovery of NVP-LDE225, a potent and selective smoothened antagonist. ACS Med. Chem. Lett. 2010, 1: 130–134.

Inhibition of Hedgehog signalling by NVP-LDE225 (Erismodegib) interferes with growth and invasion of human renal cell carcinoma cells.[Pubmed:25093491]

Br J Cancer. 2014 Sep 9;111(6):1168-79.

BACKGROUND: Multiple lines of evidence support that the Hedgehog (Hh) signalling has a role in the maintenance and progression of different human cancers. Therefore, inhibition of the Hh pathway represents a valid anticancer therapeutic approach for renal cell carcinoma (RCC) patients. NVP-LDE225 is a Smoothened (Smo) antagonist that induces dose-related inhibition of Hh and Smo-dependent tumour growth. METHODS: We assayed the effects of NVP-LDE225 alone or in combination with everolimus or sunitinib on the growth and invasion of human RCC models both in vitro and in vivo. To this aim, we used a panel of human RCC models, comprising cells with acquired resistance to sunitinib - a multiple tyrosine kinase inhibitor approved as a first-line treatment for RCC. RESULTS: NVP-LDE225 cooperated with either everolimus or sunitinib to inhibit proliferation, migration, and invasion of RCC cells even in sunitinib-resistant (SuR) cells. Some major transducers involved in tumour cell motility, including paxillin, were also efficiently inhibited by the combination therapy, as demonstrated by western blot and confocal microscopy assays. Moreover, these combined treatments inhibited tumour growth and increased animal survival in nude mice xenografted with SuR RCC cells. Finally, lung micrometastasis formation was reduced when mice were treated with NVP-LDE225 plus everolimus or sunitinib, as evidenced by artificial metastatic assays. CONCLUSIONS: Hedgehog inhibition by NVP-LDE225 plus sunitinib or everolimus bolsters antitumour activity by interfering with tumour growth and metastatic spread, even in SuR cells. Thus, this new evidence puts forward a new promising therapeutic approach for RCC patients.

Erismodegib (Sonidegib) is a potent and selective Smoothened (Smo) antagonist with IC50s of 1.3 nM and 2.5 nM for mouse and human Smo, respectively.

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