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PMID:18390750

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Citation

Al-Sadi, R, Ye, D, Dokladny, K and Ma, TY (2008) Mechanism of IL-1beta-induced increase in intestinal epithelial tight junction permeability. J. Immunol. 180:5653-61

Abstract

The IL-1beta-induced increase in intestinal epithelial tight junction (TJ) permeability has been postulated to be an important mechanism contributing to intestinal inflammation of Crohn's disease and other inflammatory conditions of the gut. The intracellular and molecular mechanisms that mediate the IL-1beta-induced increase in intestinal TJ permeability remain unclear. The purpose of this study was to elucidate the mechanisms that mediate the IL-1beta-induced increase in intestinal TJ permeability. Specifically, the role of myosin L chain kinase (MLCK) was investigated. IL-1beta caused a progressive increase in MLCK protein expression. The time course of IL-1beta-induced increase in MLCK level correlated linearly with increase in Caco-2 TJ permeability. Inhibition of the IL-1beta-induced increase in MLCK protein expression prevented the increase in Caco-2 TJ permeability. Inhibition of the IL-1beta-induced increase in MLCK activity also prevented the increase in Caco-2 TJ permeability. Additionally, knock-down of MLCK protein expression by small interference RNA prevented the IL-1beta-induced increase in Caco-2 TJ permeability. The IL-1beta-induced increase in MLCK protein expression was preceded by an increase in MLCK mRNA expression. The IL-1beta-induced increase in MLCK mRNA transcription and subsequent increase in MLCK protein expression and Caco-2 TJ permeability was mediated by activation of NF-kappaB. In conclusion, our data indicate that the IL-1beta increase in Caco-2 TJ permeability was mediated by an increase in MLCK expression and activity. Our findings also indicate that the IL-1beta-induced increase in MLCK protein expression and Caco-2 TJ permeability was mediated by an NF-kappaB-dependent increase in MLCK gene transcription.

Links

PubMed PMC3035485

Keywords

Caco-2 Cells; Cell Membrane Permeability; Humans; Interleukin-1beta/metabolism; Intestinal Mucosa/physiology; Myosin-Light-Chain Kinase/genetics; Myosin-Light-Chain Kinase/metabolism; NF-kappa B/metabolism; RNA, Small Interfering/metabolism; Tight Junctions/metabolism; Transcription, Genetic

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

HUMAN:MYLK3

involved_in

GO:0002528: regulation of vascular permeability involved in acute inflammatory response

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:MYLK3

involved_in

GO:0071347: cellular response to interleukin-1

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:IL1B

involved_in

GO:0035505: positive regulation of myosin light chain kinase activity

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:IL1B

involved_in

GO:1901224: positive regulation of NIK/NF-kappaB signaling

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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