Epithelial myosin light chain kinase-dependent barrier dysfunction mediates T cell activation-induced diarrhea in vivo

Daniel Clayburgh, Terrence A. Barrett, Yueming Tang, Jon B. Meddings, Linda J. Van Eldik, D. Martin Watterson, Lane L. Clarke, Randall J. Mrsny, Jerrold R. Turner

Research output: Contribution to journalArticle

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Abstract

Disruption of the intestinal epithelial barrier occurs in many intestinal diseases, but neither the mechanisms nor the contribution of barrier dysfunction to disease pathogenesis have been defined. We utilized a murine model of T cell-mediated acute diarrhea to investigate the role of the epithelial barrier in diarrheal disease. We show that epithelial barrier dysfunction is required for the development of diarrhea. This diarrhea is characterized by reversal of net water flux, from absorption to secretion; increased leak of serum protein into the intestinal lumen; and altered tight junction structure. Phosphorylation of epithelial myosin II regulatory light chain (MLC), which has been correlated with tight junction regulation in vitro, increased abruptly after T cell activation and coincided with the development of diarrhea. Genetic knockout of long myosin light chain kinase (MLCK) or treatment of wild-type mice with a highly specific peptide MLCK inhibitor prevented epithelial MLC phosphorylation, tight junction disruption, protein leak, and diarrhea following T cell activation. These data show that epithelial MLCK is essential for intestinal barrier dysfunction and that this barrier dysfunction is critical to pathogenesis of diarrheal disease. The data also indicate that inhibition of epithelial MLCK may be an effective non-immunosuppressive therapy for treatment of immune-mediated intestinal disease.

Original languageEnglish (US)
Pages (from-to)2702-2715
Number of pages14
JournalJournal of Clinical Investigation
Volume115
Issue number10
DOIs
StatePublished - Oct 2005
Externally publishedYes

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Myosin-Light-Chain Kinase
Diarrhea
T-Lymphocytes
Intestinal Diseases
Tight Junctions
Phosphorylation
Myosin Type II
Tight Junction Proteins
Myosin Light Chains
Blood Proteins
Peptides
Water

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Clayburgh, D., Barrett, T. A., Tang, Y., Meddings, J. B., Van Eldik, L. J., Watterson, D. M., ... Turner, J. R. (2005). Epithelial myosin light chain kinase-dependent barrier dysfunction mediates T cell activation-induced diarrhea in vivo. Journal of Clinical Investigation, 115(10), 2702-2715. https://doi.org/10.1172/JCI24970

Epithelial myosin light chain kinase-dependent barrier dysfunction mediates T cell activation-induced diarrhea in vivo. / Clayburgh, Daniel; Barrett, Terrence A.; Tang, Yueming; Meddings, Jon B.; Van Eldik, Linda J.; Watterson, D. Martin; Clarke, Lane L.; Mrsny, Randall J.; Turner, Jerrold R.

In: Journal of Clinical Investigation, Vol. 115, No. 10, 10.2005, p. 2702-2715.

Research output: Contribution to journalArticle

Clayburgh, D, Barrett, TA, Tang, Y, Meddings, JB, Van Eldik, LJ, Watterson, DM, Clarke, LL, Mrsny, RJ & Turner, JR 2005, 'Epithelial myosin light chain kinase-dependent barrier dysfunction mediates T cell activation-induced diarrhea in vivo', Journal of Clinical Investigation, vol. 115, no. 10, pp. 2702-2715. https://doi.org/10.1172/JCI24970
Clayburgh, Daniel ; Barrett, Terrence A. ; Tang, Yueming ; Meddings, Jon B. ; Van Eldik, Linda J. ; Watterson, D. Martin ; Clarke, Lane L. ; Mrsny, Randall J. ; Turner, Jerrold R. / Epithelial myosin light chain kinase-dependent barrier dysfunction mediates T cell activation-induced diarrhea in vivo. In: Journal of Clinical Investigation. 2005 ; Vol. 115, No. 10. pp. 2702-2715.
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