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PMID:17889313

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Citation

Fernandez, AL, Koval, M, Fan, X and Guidot, DM (2007) Chronic alcohol ingestion alters claudin expression in the alveolar epithelium of rats. Alcohol 41:371-9

Abstract

Previously we determined that chronic alcohol ingestion (6 weeks) in rats increases lung epithelial permeability in vivo approximately 5-6-fold and promotes flooding of the alveolar airspaces with proteinaceous fluid in response to stresses such as sepsis. In parallel, alveolar epithelial cells isolated from alcohol-fed rats fail to form tight monolayers in vitro, even when cultured for up to 8 days in the absence of alcohol. However, the molecular mechanisms underlying alcohol-induced permeability are unknown. Claudins are key components of tight junctions that restrict the paracellular movement of water, proteins, and solutes across cellular barriers including the alveolar epithelium. In this study, we examined the expression of multiple members of the claudin protein family in the lungs of alcohol-fed versus control-fed rats (Lieber-DeCarli liquid diet with either 36% of calories as alcohol or an isocaloric substitution with maltin-dextrin for 6 weeks). We determined that chronic alcohol ingestion affected the expression of multiple claudins; most striking were decreases in claudin-1 and claudin-7, and an increase in claudin-5, in the whole lung and in alveolar epithelial monolayers derived from alcohol-fed rats. In parallel, immunocytochemistry of alveolar epithelial monolayers from alcohol-fed rats revealed abnormal intracellular accumulation of claudin-7 protein and relatively decreased localization to cell membranes. Claudin-1 and claudin-7 are relatively specific to alveolar epithelial type I pneumocytes that form the vast majority of the alveolar epithelial barrier in vivo, and increases in claudin-5 have been associated with increased epithelial permeability in other systems. Therefore, these findings suggest that changes in claudin expression in the alveolar epithelium produce a "leakier" phenotype that renders the alcoholic lung susceptible to alveolar flooding during acute inflammatory stresses.

Links

PubMed PMC2048749 Online version:10.1016/j.alcohol.2007.04.010

Keywords

Animals; Cells, Cultured; Central Nervous System Depressants/toxicity; Claudin-1; Claudin-3; Claudin-4; Claudin-5; Ethanol/toxicity; Male; Membrane Proteins/metabolism; Permeability; Phenotype; Pulmonary Alveoli/drug effects; Pulmonary Alveoli/metabolism; Rats; Rats, Sprague-Dawley; Respiratory Mucosa/drug effects; Respiratory Mucosa/metabolism; Tight Junctions/drug effects; Tight Junctions/metabolism; Time Factors

Significance

Annotations

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

RAT:CLD1

involved_in

GO:0045471: response to ethanol

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

RAT:Q5I0E5

involved_in

GO:0045471: response to ethanol

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

RAT:CLD5

involved_in

GO:0045471: response to ethanol

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

RAT:CLD7

involved_in

GO:0045471: response to ethanol

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

RAT:CLD3

involved_in

GO:0045471: response to ethanol

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

Notes

See also

References

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