Synthesis, characterization and antiproliferative activity of seco analogues of brassinosteroids

Steroids. 2019 Jun:146:1-13. doi: 10.1016/j.steroids.2019.03.004. Epub 2019 Mar 16.

Abstract

Synthesis and structure-activity relationship analysis of a two groups of 2,3-seco analogues of brassinosteroids (BRs) were performed to examine their antiproliferative activities. Two steroid skeletons were chosen for the preparation of seco analogues - cholestane and stigmastane. The synthetic strategy consists of multistep reactions and detailed analysis of compounds prepared. We have discovered unpublished behaviour of 2,3-seco-2,3-dihydroxy-6-ketones leading to formation of intramolecular ketal with two new steroidal rings. Their reaction intermediates were also characterized in some cases. All compounds prepared were fully characterized with NMR and MS techniques. Most of compounds were tested for in vitro cytotoxicity on three cancer cell lines (CEM, MCF7, and HeLa) and normal human fibroblasts (BJ). It was discovered that some seco analogues caused apoptosis in cancer cells. The most promising seco derivative 28 proved to have high therapeutic index.

Keywords: Apoptosis; Brassinosteroids; Cyclization; Cytotoxicity; Seco analogues; Skeletal modification.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antineoplastic Agents / chemical synthesis*
  • Antineoplastic Agents / chemistry
  • Antineoplastic Agents / pharmacology*
  • Apoptosis / drug effects
  • Brassinosteroids / chemical synthesis*
  • Brassinosteroids / chemistry
  • Brassinosteroids / pharmacology*
  • Cell Proliferation / drug effects
  • Chemistry Techniques, Synthetic
  • Drug Screening Assays, Antitumor
  • HeLa Cells
  • Humans
  • MCF-7 Cells
  • Structure-Activity Relationship

Substances

  • Antineoplastic Agents
  • Brassinosteroids