Identification of novel protein tyrosine phosphatase sigma inhibitors promoting neurite extension

Bioorg Med Chem Lett. 2016 Jan 1;26(1):87-93. doi: 10.1016/j.bmcl.2015.11.026. Epub 2015 Nov 10.

Abstract

Protein tyrosine phosphatase sigma (PTPσ) is a potential target for the therapeutic treatment of neurological deficits associated with impaired neuronal recovery, as this protein is the receptor for chondroitin sulfate proteoglycan (CSPG), which is known to inhibit neuronal regeneration. Through a high-throughput screening approach started from 6400 representative compounds in the Korea Chemical Bank chemical library, we identified 11 novel PTPσ inhibitors that can be classified as flavonoid derivatives or analogs, with IC50 values ranging from 0.5 to 17.5μM. Biochemical assays and structure-based active site-docking simulation indicate that our inhibitors are accommodated at the catalytic active site of PTPσ as surrogates for the phosphotyrosine group. Treatments of these compounds on PC-12 neuronal cells led to the recovery of neurite extension attenuated by CSPG treatment, demonstrating their potential as antineurodegenerative agents.

Keywords: High-throughput screening; Inhibitor; PTPσ; Protein tyrosine phosphatase; Receptor type PTP.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Dose-Response Relationship, Drug
  • Enzyme Inhibitors / chemical synthesis
  • Enzyme Inhibitors / chemistry
  • Enzyme Inhibitors / pharmacology*
  • Flavonoids / chemical synthesis
  • Flavonoids / chemistry
  • Flavonoids / pharmacology*
  • Models, Molecular
  • Molecular Structure
  • Neurites / drug effects*
  • Neurites / metabolism
  • PC12 Cells
  • Rats
  • Receptor-Like Protein Tyrosine Phosphatases, Class 2 / antagonists & inhibitors*
  • Receptor-Like Protein Tyrosine Phosphatases, Class 2 / metabolism
  • Small Molecule Libraries / chemical synthesis
  • Small Molecule Libraries / chemistry
  • Small Molecule Libraries / pharmacology
  • Structure-Activity Relationship

Substances

  • Enzyme Inhibitors
  • Flavonoids
  • Small Molecule Libraries
  • Receptor-Like Protein Tyrosine Phosphatases, Class 2