Interleukin-17 inhibition: role in psoriasis and inflammatory bowel disease

J Dermatolog Treat. 2018 Feb;29(1):13-18. doi: 10.1080/09546634.2017.1329511. Epub 2017 May 31.


Introduction: Interleukin 17 (IL-17) antagonism provides a highly effective approach for treating psoriasis. Exacerbations of inflammatory bowel disease have been reported in anti-IL-17 psoriasis trials.

Aim: To characterize the relationship between IL-17 inhibition and inflammatory bowel disease.

Methods: A review of English-language articles was performed. Search terms included IL-17, psoriasis, inflammatory bowel disease, secukinumab, ixekizumab and brodalumab.

Results: IL-17 A inhibition, IL-17RA inhibition and IL-17 knockout led to induction or exacerbation of colitis in mouse models. The placebo groups fared better than the treatment group in controlled trials of anti-IL-17 antibody and anti-IL-17 receptor for Crohn's disease (CD). A brodalumab study (N = 1576) revealed one reported CD case. An ixekizumab study (N = 3736) evaluating moderate-to-severe psoriasis, four patients reported CD and seven reported UC while ixekizumab every 2 weeks led to a moderate exacerbation of UC in one patient and new-onset CD in one patient. A secukinumab study (N = 3430) revealed exposure adjusted incidence rates of 0.11 and 0.15 per 100 patient-years for CD and UC, respectively.

Discussion: Anti-IL-17 medications are associated with IBD exacerbation. Caution should be used in prescribing these medications in patients with diagnosed IBD or personal history suggestive of IBD.

Keywords: Biologics; brodalumab; ixekizumab; secukinumab.

Publication types

  • Review

MeSH terms

  • Animals
  • Antibodies, Monoclonal / adverse effects
  • Antibodies, Monoclonal / therapeutic use*
  • Antibodies, Monoclonal, Humanized / adverse effects
  • Antibodies, Monoclonal, Humanized / therapeutic use
  • Clinical Trials as Topic
  • Colitis, Ulcerative / epidemiology
  • Colitis, Ulcerative / etiology
  • Crohn Disease / epidemiology
  • Crohn Disease / etiology
  • Humans
  • Inflammatory Bowel Diseases / epidemiology
  • Inflammatory Bowel Diseases / etiology*
  • Interleukin-17 / antagonists & inhibitors*
  • Interleukin-17 / genetics
  • Interleukin-17 / immunology
  • Mice
  • Mice, Knockout
  • Psoriasis / drug therapy*


  • Antibodies, Monoclonal
  • Antibodies, Monoclonal, Humanized
  • Interleukin-17
  • brodalumab
  • ixekizumab
  • secukinumab