Substituted indole Mcl-1 inhibitors: a patent evaluation (WO2015148854A1)

ABSTRACT

The myeloid cell leukemia 1 (Mcl-1) protein, an anti-apoptotic member of Bcl-2 family, plays a critical role in the development and maintenance of many cancers and is listed in the ‘top ten’ pathological factors across the diversity of human cancers. The patent described in this evaluation (WO2015148854A1) claimed substituted indole Mcl-1 inhibitors for the treatment of diseases and conditions (e.g., cancer) characterized by the over-expression or dysregulation of Mcl-1 proteins. A variety of 2-position substituents distinguished indole Mcl-1 inhibitors claimed in this patent from another two patents by AbbVie Inc. (WO2008131000A2 and WO2008130970A1). They exhibited low-nanomolar binding affinities and >100-fold selectivity over Bcl-2 and Bcl-xL in vitro, and low-micromolar killing abilities against a panel of tumour cell lines. Moreover, the compounds in this patent revealed that the structural basis for selective Mcl-1 inhibitors may not completely depend on the 5 known binding hot-spots, and conformational flexibility of Mcl-1 protein could contribute to the binding specificity.

KEYWORDS:

• Apoptosis
• cancer
• Mcl-1
• Bcl-2
• small-molecule inhibitors of Mcl-1
• pan and selective

Declaration of interest

The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties.

Additional information

Funding

This work has been supported by the Natural Science Foundation of China (21372036, 21402022, 81430083, 81273436, and 21502015) and by ‘the Fundamental Research Funds for the Central Universities’ (DUT15RC (4)10).