Rhododendric acid A, a new ursane-type PTP1B inhibitor from the endangered plant Rhododendron brachycarpum G. Don

Bioorg Med Chem Lett. 2012 Oct 1;22(19):6116-9. doi: 10.1016/j.bmcl.2012.08.029. Epub 2012 Aug 14.

Abstract

In spite of the critical role of the natural products in drug discovery, surprising little attention has been placed on endangered and rare plant species that could play a pivotal role in pharmaceutical and fiber development. Protein tyrosine phosphatase-1B (PTP1B), which blocks insulin signaling, has been gaining interest to be a promising therapeutic target for the treatment of type 2 diabetes mellitus. Bioassay-guided fractionation on the leaves of Rhododendron brachycarpum G. Don (Ericaceae) yielded seven PTP1B inhibitory triterpenoids, including a new triterpene, rhododendric acid A (1). Their PTP1B inhibitory potency and their lipophilicity were investigated to provide a feasible scaffold that may overcome the innate limitation of the previously reported PTP1B inhibitors.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Dose-Response Relationship, Drug
  • Enzyme Inhibitors / chemical synthesis
  • Enzyme Inhibitors / chemistry
  • Enzyme Inhibitors / pharmacology*
  • Ericaceae / chemistry*
  • Molecular Structure
  • Plant Leaves / chemistry*
  • Protein Tyrosine Phosphatase, Non-Receptor Type 1 / antagonists & inhibitors*
  • Protein Tyrosine Phosphatase, Non-Receptor Type 1 / metabolism
  • Recombinant Proteins / antagonists & inhibitors
  • Recombinant Proteins / metabolism
  • Stereoisomerism
  • Structure-Activity Relationship
  • Triterpenes / chemistry
  • Triterpenes / pharmacology*

Substances

  • Enzyme Inhibitors
  • Recombinant Proteins
  • Triterpenes
  • rhododendric acid A
  • PTPN1 protein, human
  • Protein Tyrosine Phosphatase, Non-Receptor Type 1