Immunoproteasome inhibitor DPLG3 attenuates experimental colitis by restraining NF-κB activation. Academic Article uri icon

Overview

abstract

  • Inflammatory bowel disease is a chronic and pathologic autoimmune condition. And immunoproteasome is becoming an attractive therapeutic target for autoimmune inflammatory diseases. In this study, we evaluated the therapeutic effects of a specific small molecule inhibitor of the chymotryptic-like β5i subunits of the immunoproteasome, DPLG3, in a preclinical murine colitis model and explored the underlying molecular mechanism for the immune suppression. DPLG3 showed significant effects in attenuating the disease progression in experimental colitis, reducing the body and spleen weight losses, and colon length shortening compared to vehicle-treated controls and to the well studied immunoproteasome inhibitor ONX-0914. Mechanistically, DPLG3 decreased inflammatory cytokines and the influx of effector T cells and macrophages in colon tissues while increasing the number of regulatory T cells. Molecular docking analysis of the protein-ligand interaction profile revealed that the β5i-DPLG3 complex was more stable and efficient in the binding sites compared to those formed with ONX-0914 and LU-005i. Furthermore, DPLG3 reduced the protein levels of the canonical NF-κB p50 and p65, as well as the nuclear p65. Thus, DPLG3 constitutes a potentially efficacious clinical agent for autoimmune inflammatory diseases.

publication date

  • April 8, 2020

Research

keywords

  • Colitis
  • Dipeptides
  • Molecular Docking Simulation
  • NF-kappa B
  • Proteasome Endopeptidase Complex
  • Proteasome Inhibitors
  • Signal Transduction

Identity

Scopus Document Identifier

  • 85083433755

Digital Object Identifier (DOI)

  • 10.1016/j.bcp.2020.113964

PubMed ID

  • 32278007

Additional Document Info

volume

  • 177