Structure-activity relationship investigation for benzonaphthyridinone derivatives as novel potent Bruton's tyrosine kinase (BTK) irreversible inhibitors

Eur J Med Chem. 2017 Sep 8:137:545-557. doi: 10.1016/j.ejmech.2017.06.016. Epub 2017 Jun 9.

Abstract

Through a structure-based drug design approach, a tricyclic benzonaphthyridinone pharmacophore was used as a starting point for carrying out detailed medicinal structure-activity relationhip (SAR) studies geared toward characterization of a panel of proposed BTK inhibitors, including 6 (QL-X-138), 7 (BMX-IN-1) and 8 (QL47). These studies led to the discovery of the novel potent irreversible BTK inhibitor, compound 18 (CHMFL-BTK-11). Kinetic analysis of compound 18 revealed an irreversible binding efficacy (kinact/Ki) of 0.01 μM-1s-1. Compound 18 potently inhibited BTK kinase Y223 auto-phosphorylation (EC50 < 100 nM), arrested cell cycle in G0/G1 phase, and induced apoptosis in Ramos, MOLM13 and Pfeiffer cells. We believe these features would make 18 a good pharmacological tool for studying BTK-related pathologies.

Keywords: B-Cell lymphoma; BTK; Irreversible inhibitor; Kinase inhibitor; Structure-activity relationship.

MeSH terms

  • Agammaglobulinaemia Tyrosine Kinase
  • Antineoplastic Agents / chemical synthesis
  • Antineoplastic Agents / chemistry
  • Antineoplastic Agents / pharmacology*
  • Apoptosis / drug effects
  • Cell Cycle Checkpoints / drug effects
  • Cell Proliferation / drug effects
  • Dose-Response Relationship, Drug
  • Drug Screening Assays, Antitumor
  • Humans
  • Kinetics
  • Models, Molecular
  • Molecular Structure
  • Naphthyridines / chemical synthesis
  • Naphthyridines / chemistry
  • Naphthyridines / pharmacology*
  • Protein Kinase Inhibitors / chemical synthesis
  • Protein Kinase Inhibitors / chemistry
  • Protein Kinase Inhibitors / pharmacology*
  • Protein-Tyrosine Kinases / antagonists & inhibitors*
  • Protein-Tyrosine Kinases / metabolism
  • Structure-Activity Relationship
  • Tumor Cells, Cultured

Substances

  • Antineoplastic Agents
  • Naphthyridines
  • Protein Kinase Inhibitors
  • Protein-Tyrosine Kinases
  • Agammaglobulinaemia Tyrosine Kinase
  • BTK protein, human