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Assimakopoulos, S.F. et al.

Assimakopoulos, Vagianos, Charonis, Alexandris, Spiliopoulou, Thomopoulos, Nikolopoulou, Scopa,

Experimental obstructive jaundice alters claudin-4 expression in intestinal mucosa: effect of bombesin and neurotensin.

AIM: To investigate the influence of experimental obstructive jaundice and exogenous bombesin (BBS) and neurotensin ( NT) administration on the expression of the tight junction (TJ)-protein claudin-4 in intestinal epithelium of rats. METHODS: Forty male Wistar rats were randomly divided into five groups: I = controls, II = sham operated, III = bile duct ligation (BDL), IV = BDL+BBS (30 microg/kg per d), V = BDL+NT (300 microg/kg per d). At the end of the experiment on d 10, endotoxin was measured in portal and aortic blood. Tissue sections of the terminal ileum were examined histologically and immunohistochemically for evaluation of claudin-4 expression in intestinal epithelium. RESULTS: Obstructive jaundice led to intestinal barrier failure demonstrated by significant portal and aortic endotoxemia. Claudin-4 expression was significantly increased in the upper third of the villi in jaundiced rats and an upregulation of its lateral distribution was noted. Administration of BBS or NT restored claudin-4 expression to the control state and significantly reduced portal and aortic endotoxemia. CONCLUSION: Experimental obstructive jaundice increases claudin-4 expression in intestinal epithelium, which may be a key factor contributing to the disruption of the mucosal barrier. Gut regulatory peptides BBS and NT can prevent this alteration and reduce portal and systemic endotoxemia.[1]

References

Experimental obstructive jaundice alters claudin-4 expression in intestinal mucosa: effect of bombesin and neurotensin. Assimakopoulos, S.F., Vagianos, C.E., Charonis, A.S., Alexandris, I.H., Spiliopoulou, I., Thomopoulos, K.C., Nikolopoulou, V.N., Scopa, C.D. World J. Gastroenterol. (2006) [Pubmed]

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