NMS-E973

NMS-E973 is a potent and selective inhibitor of heat shock protein 90 (Hsp90) with DC50 value of < 10nM [1].

Since Hsp90 plays an important role in the conformational maturation, stability and function of some oncogenic proteins, the inhibitors of Hsp90 are developed as therapeutic for cancers. NMS-E973 is a selective inhibitor of Hsp90. It binds to Hsp90α within the ATP binding site with DC50 value of < 10nM. Besides that, NMS-E973 shows no effect on a panel of 52 various protein kinases such as ABL, ACK1, AKT1 and Alk. The IC50 value of it for Hsc70 is > 10μM. NMS-E973 exerts antiproliferation effects on A2780 tumor cell line and BT-474 breast cancer cell line with IC50 values of 69nM and 110nM, respectively. When treated with mice bearing A2780 xenografts, the intravenous administration of NMS-E973 significantly inhibits tumor growth with TGI value of 53% at dose of 30mg/kg. Moreover, NMS-E973 also displays antitumor activity in tumors resistant to kinase inhibitors such as vemurafenib [1, 2].

References:
[1] Brasca M G, Mantegani S, Amboldi N, et al. Discovery of NMS-E973 as novel, selective and potent inhibitor of heat shock protein 90 (Hsp90). Bioorganic & medicinal chemistry, 2013, 21(22): 7047-7063.
[2] Fogliatto G, Gianellini L, Brasca M G, et al. NMS-E973, a novel synthetic inhibitor of Hsp90 with activity against multiple models of drug resistance to targeted agents, including intracranial metastases. Clinical Cancer Research, 2013, 19(13): 3520-3532.

Discovery of NMS-E973 as novel, selective and potent inhibitor of heat shock protein 90 (Hsp90).[Pubmed:24100158]

Bioorg Med Chem. 2013 Nov 15;21(22):7047-63.

Novel small molecule inhibitors of heat shock protein 90 (Hsp90) were discovered with the help of a fragment based drug discovery approach (FBDD) and subsequent optimization with a combination of structure guided design, parallel synthesis and application of medicinal chemistry principles. These efforts led to the identification of compound 18 (NMS-E973), which displayed significant efficacy in a human ovarian A2780 xenograft tumor model, with a mechanism of action confirmed in vivo by typical modulation of known Hsp90 client proteins, and with a favorable pharmacokinetic and safety profile.

NMS-E973, a novel synthetic inhibitor of Hsp90 with activity against multiple models of drug resistance to targeted agents, including intracranial metastases.[Pubmed:23674492]

Clin Cancer Res. 2013 Jul 1;19(13):3520-32.

PURPOSE: Recent developments of second generation Hsp90 inhibitors suggested a potential for development of this class of molecules also in tumors that have become resistant to molecular targeted agents. Disease progression is often due to brain metastases, sometimes related to insufficient drug concentrations within the brain. Our objective was to identify and characterize a novel inhibitor of Hsp90 able to cross the blood-brain barrier (BBB). EXPERIMENTAL DESIGN: Here is described a detailed biochemical and crystallographic characterization of NMS-E973. Mechanism-based anticancer activity was described in cell models, including models of resistance to kinase inhibitors. Pharmacokinetics properties were followed in plasma, tumor, liver, and brain. In vivo activity and pharmacodynamics, as well as the pharmacokinetic/pharmacodynamic relationships, were evaluated in xenografts, including an intracranially implanted melanoma model. RESULTS: NMS-E973, representative of a novel isoxazole-derived class of Hsp90 inhibitors, binds Hsp90alpha with subnanomolar affinity and high selectivity towards kinases, as well as other ATPases. It possesses potent antiproliferative activity against tumor cell lines and a favorable pharmacokinetic profile, with selective retention in tumor tissue and ability to cross the BBB. NMS-E973 induces tumor shrinkage in different human tumor xenografts, and is highly active in models of resistance to kinase inhibitors. Moreover, consistent with its brain penetration, NMS-E973 is active also in an intracranially implanted melanoma model. CONCLUSIONS: Overall, the efficacy profile of NMS-E973 suggests a potential for development in different clinical settings, including tumors that have become resistant to molecular targeted agents, particularly in cases of tumors which reside beyond the BBB.

NMS-E973 is a potent and selective Hsp90 inhibitor with DC50 of <10 nM for Hsp90 binding, no activiy against a panel of 52 diverse protein kinases.

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