Larazotide acetate regulates epithelial tight junctions in vitro and in vivo

Shobha Gopalakrishnan, Malarvizhi Durai, Kelly Kitchens, Amir P. Tamiz, Robert Somerville, Mark Ginski, Blake M. Paterson, Joseph A. Murray, Elena F. Verdu, Sefik S. Alkan, Niranjan B. Pandey

Research output: Contribution to journalArticle

54 Scopus citations

Abstract

Tight junctions (TJs) control paracellular permeability and apical-basolateral polarity of epithelial cells, and can be regulated by exogenous and endogenous stimuli. Dysregulated permeability is associated with pathological conditions, such as celiac disease and inflammatory bowel disease. Herein we studied the mechanism by which larazotide acetate, an 8-mer peptide and TJ regulator, inhibits the cellular changes elicited by gliadin fragments, AT-1002, and cytokines. Previously, we demonstrated that AT-1002, a 6-mer peptide derived from the Vibrio cholerae zonula occludens toxin ZOT, caused several biochemical changes in IEC6 and Caco-2 cells resulting in decreased transepithelial electrical resistance (TEER) and increased TJ permeability. In this study, larazotide acetate inhibited the redistribution and rearrangement of zonula occludens-1 (ZO-1) and actin caused by AT-1002 and gliadin fragments in Caco-2 and IEC6 cells. Functionally, larazotide acetate inhibited the AT-1002-induced TEER reduction and TJ opening in Caco-2 cells. Additionally, larazotide acetate inhibited the translocation of a gliadin 13-mer peptide, which has been implicated in celiac disease, across Caco-2 cell monolayers. Further, apically applied larazotide acetate inhibited the increase in TJ permeability elicited by basolaterally applied cytokines. Finally, when tested in vivo in gliadin-sensitized HLA-HCD4/DQ8 double transgenic mice, larazotide acetate inhibited gliadin-induced macrophage accumulation in the intestine and preserved normal TJ structure. Taken together, our data suggest that larazotide acetate inhibits changes elicited by AT-1002, gliadin, and cytokines in epithelial cells and preserves TJ structure and function in vitro and in vivo.

Original languageEnglish (US)
Pages (from-to)86-94
Number of pages9
JournalPeptides
Volume35
Issue number1
DOIs
StatePublished - May 1 2012

Keywords

  • Actin
  • Celiac disease
  • Gliadin
  • Permeability inducer
  • Tight junction
  • ZO-1

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Endocrinology
  • Cellular and Molecular Neuroscience

Fingerprint Dive into the research topics of 'Larazotide acetate regulates epithelial tight junctions in vitro and in vivo'. Together they form a unique fingerprint.

Cite this