Cited by 385Inflammatory Bowel DiseaseDrug Transport and Resistance MechanismsGastrointestinal motility and disorders

The bile acid receptor GPBAR-1 (TGR5) modulates integrity of intestinal barrier and immune response to experimental colitis

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Cipriani, Sabrina, Mencarelli, Andrea, Chini, Maria Giovanna, Distrutti, Eleonora, Renga, Barbara, Bifulco, Giuseppe, Baldelli, Franco, Donini, Annibale +1 more·2011·PLoS ONE

Abstract

BACKGROUND: GP-BAR1, a member G protein coupled receptor superfamily, is a cell surface bile acid-activated receptor highly expressed in the ileum and colon. In monocytes, ligation of GP-BAR1 by secondary bile acids results in a cAMP-dependent attenuation of cytokine generation. AIMS: To investigate the role GP-BAR1 in regulating intestinal homeostasis and inflammation-driven immune dysfunction in rodent models of colitis. METHODS: Colitis was induced in wild type and GP-BAR1(-/-) mice by DSS and TNBS administration. Potential GP-BAR1 agonists were identified by in silico screening and computational docking studies. RESULTS: GP-BAR1(-/-) mice develop an abnormal morphology of colonic mucous cells and an altered molecular architecture of epithelial tight junctions with increased expression and abnormal subcellular distribution of zonulin 1 resulting in increased intestinal permeability and susceptibility to develop severe colitis in response to DSS at early stage of life. By in silico screening and docking studies we identified ciprofloxacin as a GP-BAR1 ligand. In monocytes, ciprofloxacin increases cAMP concentrations and attenuates TNFα release induced by TLR4 ligation in a GP-BAR1 dependent manner. Treating mice rendered colitic by TNBS with ciprofloxacin and oleanolic acid, a well characterized GP-BAR1 ligand, abrogates signs and symptoms of colitis. Colonic expression of GP-BAR1 mRNA increases in rodent models of colitis and tissues from Crohn's disease patients. Flow cytometry analysis demonstrates that ≈90% of CD14+ cells isolated from the lamina propria of TNBS-treated mice stained positively for GP-BAR1. CONCLUSIONS: GP-BAR1 regulates intestinal barrier structure. Its expression increases in rodent models of colitis and Crohn's disease. Ciprofloxacin is a GP-BAR1 ligand.

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Crossref · 10.1371/journal.pone.0025637

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  • Changes in bile acid pool composition, increased colonic GPBAR1 expression, and decreased ileal BAR activity have been detected in IBD patients.

    “changes in the composition of the bile acid pool, an increase in colonic expression of GPBAR1 and a decrease in ileal activity of BAR have all been detected in patients suffering from IBD (Cipriani et al., 2011; Duboc et al., 2013; Lenz et al., 1976; Nijmeijer et al., 2011; Rutgeerts et al., 1979).”
  • Gpbar1−/− mice develop more severe disease than wildtype controls in several animal models of inflammatory disorder, including colitis, hepatitis, and gastritis.

    “Gpbar1−/− mice, like their Nr1h4−/− counterparts, develop more severe disease than wildtype controls in several animal models of inflammatory disorder, including colitis, hepatitis and gastritis (Cipriani et al., 2011; C. Guo et al., 2015; Y.-D. Wang et al., 2011).”
  • Mice treated with GP-BAR1 agonists (ciprofloxacin and oleanolic acid) abrogated the signs and symptoms of TNBS-induced colitis.

    “Mice treated with GP-BAR1 agonists (ciprofloxacin and oleanolic acid) abrogated the signs and symptoms of TNBS-induced colitis.117”
  • GP-BAR1-/- mice were more susceptible to DSS- or TNBS-induced colitis.

    “Importantly these mice were more susceptible to DSS- or TNBS-induced colitis.117”

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Authors
Cipriani, S., Mencarelli, A., Chini, M. G., Distrutti, E., Renga, B., Bifulco, G., Baldelli, F., Donini, A., & Fiorucci, S.
Affiliations
  • University of Perugia (IT)
  • University of Salerno (IT)
  • Azienda Ospedaliera di Perugia (IT)
Corresponding author
Fiorucci, Stefano
Venue
PLoS ONE
Published
2011-10-27
Volume
6
Issue
10
Pages
e25637
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1970465623
Cited by
382
References
30
Citations by year
2026: 20 · 2025: 19 · 2024: 30 · 2023: 34 · 2022: 45 · 2021: 49 · 2020: 31 · 2019: 29 · 2018: 25 · 2017: 14 · 2016: 16 · 2015: 17 · 2014: 23 · 2013: 19 · 2012: 11
FWCI
10.58
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • National University of Singapore (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • Archivio Istituzionale della Ricerca - Università degli Studi del Molise (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Inflammatory Bowel Disease
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
Keywords
TGR5, bile acid receptors, colitis, intestinal barrier integrity, tight junctions, intestinal permeability, ciprofloxacin, oleanolic acid, cAMP signaling, TNF-α, TLR4, monocytes, Crohn's disease, DSS-induced colitis, TNBS-induced colitis, lamina propria
MeSH terms
Animals, Cholera Toxin, Ciprofloxacin, Colitis, Haptoglobins, Immunity, Intestinal Mucosa, Ligands, Permeability, Protein Precursors, Mice, Knockout, Tight Junctions, Receptors, G-Protein-Coupled, Mice

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