1. Academic Validation
  2. Vidofludimus inhibits colonic interleukin-17 and improves hapten-induced colitis in rats by a unique dual mode of action

Vidofludimus inhibits colonic interleukin-17 and improves hapten-induced colitis in rats by a unique dual mode of action

  • J Pharmacol Exp Ther. 2012 Sep;342(3):850-60. doi: 10.1124/jpet.112.192203.
Leo R Fitzpatrick 1 Jeffrey S Small Robert Doblhofer Aldo Ammendola
Affiliations

Affiliation

  • 1 Department of Pharmacology, Penn State College of Medicine, Hummelstown, PA 17036, USA. lfitzpatrick@psu.edu
Abstract

Vidofludimus (Vido) is a novel oral immunomodulatory drug that inhibits dihydro-orotate dehydrogenase and lymphocyte proliferation in vitro. Vido inhibits interleukin (IL)-17 secretion in vitro independently of effects on lymphocyte proliferation. Our primary goal was to evaluate the in vivo effects of Vido on IL-17 secretion and the parameters of trinitrobenzene sulfonic acid (TNBS)-induced colitis in rats. To further delineate the mechanism of action for Vido, rats were dosed concomitantly with uridine (Uri). Young Wistar rats received a 150-μl enema of either phosphate-buffered saline (PBS) or TNBS on study day 1. The ex vivo effects of Vido on 24-h colonic IL-17 secretion were determined by using colonic strips from PBS- or TNBS-treated rats. Some rats were dosed with vehicle, Vido, or Vido + Uri for 6 days. On day 6, the parameters of colitis were determined from colonic tissue. These parameters included macroscopic, histological, and transcription factor measurements, IL-17 production, and numbers of CD3+ T cells. Ex vivo Vido completely blocked IL-23 + IL-1β-stimulated secretion of IL-17 by colonic strips. In vivo Vido treatment alone most effectively reduced macroscopic and histological pathology and the numbers of CD3+ T cells. In contrast, similarly reduced nuclear signal transducer and activator of transcription 3 (STAT3) binding and IL-17 levels were observed from Animals treated with Vido alone and Vido + Uri. Vido improves TNBS-induced colonic inflammation by a unique dual mode of action: 1) inhibiting expansion of colonic T lymphocytes, and 2) suppressing colonic IL-17 production, which is independent from the control of T-lymphocyte proliferation, by inhibition of STAT3 and nuclear factor-κB activation.

Figures
Products