Keith Wilson
Faculty Member
Last active: 8/13/2019

STAT6 activation in ulcerative colitis: a new target for prevention of IL-13-induced colon epithelial cell dysfunction.

Rosen MJ, Frey MR, Washington MK, Chaturvedi R, Kuhnhein LA, Matta P, Revetta FL, Wilson KT, Polk DB
Inflamm Bowel Dis. 2011 17 (11): 2224-34

PMID: 21308881 · PMCID: PMC3120916 · DOI:10.1002/ibd.21628

BACKGROUND - Interleukin 13 (IL-13) is upregulated in ulcerative colitis (UC) and increases colon epithelial permeability by inducing apoptosis and expression of the pore-forming tight junction protein claudin-2. IL-13 induces activation of signal transducer and activator of transcription 6 (STAT6). However, the STAT6 phosphorylation status in patients with UC is unknown, as is the effect of STAT6 inhibition on colonic epithelium exposed to IL-13. The study aims were to determine if mucosal STAT6 phosphorylation is increased in patients with UC, and if STAT6 inhibition attenuates IL-13-induced colon epithelial cell dysfunction.

METHODS - Immunohistochemical staining for phosphorylated (p) STAT6 was performed on colonic tissue from newly diagnosed pediatric subjects with UC (early UC) or Crohn's disease (CD), colectomy tissue from adults with UC (advanced UC), and controls. Colon HT-29 and T84 cells were transfected with STAT6 small interfering RNA (siRNA), or treated with suberoylanilide hydroxamic acid (SAHA), a histone deacetylase inhibitor that inhibits STAT6, prior to IL-13 treatment.

RESULTS - The median score for epithelial pSTAT6 was 0 in control subjects, 2 in early UC (versus control P = 0.019), 4 in advanced UC (P = 0.003), and 0 in CD (P = 0.4). Cell transfection with STAT6 siRNA prevented IL-13-induced apoptosis and claudin-2 expression. SAHA inhibited IL-13-induced STAT6 phosphorylation, apoptosis, and claudin-2 expression, and mitigated IL-13-induced reductions in transepithelial resistance.

CONCLUSIONS - UC is associated with increased colonic epithelial STAT6 phosphorylation, and STAT6 inhibition prevents IL-13-induced apoptosis and barrier disruption. These data identify STAT6 as a novel target for UC treatment and support further study of SAHA as a therapeutic agent.

Copyright © 2011 Crohn's & Colitis Foundation of America, Inc.

MeSH Terms (24)

Apoptosis Blotting, Western Case-Control Studies Cells, Cultured Child Claudins Colitis, Ulcerative Colon Crohn Disease Epithelial Cells Female Humans Hydroxamic Acids Immunoenzyme Techniques Interleukin-13 Male Phosphorylation Real-Time Polymerase Chain Reaction RNA, Messenger RNA, Small Interfering Signal Transduction STAT6 Transcription Factor Up-Regulation Vorinostat

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