Tight Junctions

Publication Title: 
European Journal of Pharmaceutical Sciences: Official Journal of the European Federation for Pharmaceutical Sciences

Traditionally Boswellia serrata extract is used in the Indian Ayurvedic medicine for the treatment of inflammatory diseases. In 2002 the EMEA designated Boswellia an orphan drug status for the treatment of peritumoral oedema. Pharmacokinetic studies yielded low plasma concentrations of the active ingredients 11-keto-beta-boswellic acid (KBA) and 3-acetyl-11-keto-beta-boswellic acid (AKBA). In continuation of the tests investigating the factors limiting bioavailability of boswellic acids, the present study examined the permeability of KBA and AKBA in human Caco-2 cell lines.

Author(s): 
Krüger, Phillip
Kanzer, Johanna
Hummel, Jessica
Fricker, Gert
Schubert-Zsilavecz, Manfred
Abdel-Tawab, Mona
Publication Title: 
American Journal of Physiology. Cell Physiology

The Salmonella effector protein SigD is an inositol phosphate phosphatase that inhibits phosphatidylinositol 3-kinase-dependent signaling. Because epidermal growth factor (EGF) inhibits chloride secretion via phosphatidylinositol 3-kinase, we explored whether Salmonella infection might modify the inhibitory effect of EGF. As expected, EGF inhibited chloride secretion induced by carbachol in T(84) epithelial cells. Infection with wild-type (WT) but not sigD(-) mutant S. typhimurium SL1344 decreased CCh-stimulated chloride secretion.

Author(s): 
Bertelsen, Lone S.
Paesold, Günther
Marcus, Sandra L.
Finlay, Brett B.
Eckmann, Lars
Barrett, Kim E.
Publication Title: 
American Journal of Physiology. Gastrointestinal and Liver Physiology

P-glycoprotein, the product of the multidrug resistance protein 1 (MDR1) gene, is a xenobiotic transporter that may contribute to the physiology of the intestinal barrier. Twenty-five percent of mdr1a-deficient (mdr1a(-/-)) mice spontaneously develop colitis at variable ages when maintained under specific pathogen-free conditions. We hypothesized that this disease would result from epithelial dysfunction and that conventional housing would increase incidence and severity of the colitis phenotype. Wild-type congenic FVB (+/+) mice were maintained under the same conditions as controls.

Author(s): 
Resta-Lenert, Silvia
Smitham, Jane
Barrett, Kim E.
Publication Title: 
PloS One

BACKGROUND: Fibulin-4 is an extracellular matrix protein expressed by vascular smooth muscle cells that is essential for maintaining arterial integrity. Fibulin-4(-/-) mice die just before birth due to arterial hemorrhage, but fibulin-4(+/-) mice appear to be outwardly normal. Experiments were therefore performed to determine whether fibulin-4(+/-) mice display arterial pathologies on a microscopic scale.

Author(s): 
Cudilo, Elizabeth
Al Naemi, Hamda
Marmorstein, Lihua
Baldwin, Ann L.
Publication Title: 
Physiological Reviews

The primary functions of the gastrointestinal tract have traditionally been perceived to be limited to the digestion and absorption of nutrients and to electrolytes and water homeostasis. A more attentive analysis of the anatomic and functional arrangement of the gastrointestinal tract, however, suggests that another extremely important function of this organ is its ability to regulate the trafficking of macromolecules between the environment and the host through a barrier mechanism.

Author(s): 
Fasano, Alessio
Publication Title: 
The Journal of Biological Chemistry

The impermeant nature of the intestinal barrier is maintained by tight junctions (TJs) formed between adjacent intestinal epithelial cells. Disruption of TJs and loss of barrier function are associated with a number of gastrointestinal diseases, including neonatal necrotizing enterocolitis (NEC), the leading cause of death from gastrointestinal diseases in preterm infants. Human milk is protective against NEC, and the human milk factor erythropoietin (Epo) has been shown to protect endothelial cell-cell and blood-brain barriers.

Author(s): 
Shiou, Sheng-Ru
Yu, Yueyue
Chen, Sangzi
Ciancio, Mae J.
Petrof, Elaine O.
Sun, Jun
Claud, Erika C.
Publication Title: 
Pediatric Research

Preterm infants face many challenges in transitioning from the in utero to extrauterine environment while still immature. Failure of the preterm gut to successfully mature to accommodate bacteria and food substrate leads to significant morbidity such as neonatal necrotizing enterocolitis. The intestinal epithelial barrier plays a critical role in gut protection. Heat shock protein 70 (Hsp70) is an inducible cytoprotective molecule shown to protect the intestinal epithelium in adult models.

Author(s): 
Liedel, Jennifer L.
Guo, Yuee
Yu, Yueyue
Shiou, Sheng-Ru
Chen, Sangzi
Petrof, Elaine O.
Hu, Shien
Musch, Mark W.
Claud, Erika C.
Publication Title: 
Current Opinion in Supportive and Palliative Care

PURPOSE OF REVIEW: Gut toxicity, or mucositis, is a major dose-limiting side effect of chemotherapy that until recently received very little attention. Despite significant research, the mechanisms that underpin chemotherapy-induced gut toxicity (CIGT) remain unclear. Recently however, there has been renewed interest in the role tight junctions play in the pathogenesis of CIGT and associated diarrhea.

Author(s): 
Wardill, Hannah R.
Bowen, Joanne M.
Publication Title: 
World journal of gastroenterology: WJG

AIM: To investigate the effects of moxibustion on down-regulation of the colonic epithelial cell apoptosis and repair of the tight junctions in rats with Crohn's disease (CD). METHODS: Sixty male Sprague-Dawley rats were randomly divided into a normal control (NC) group, a model control (MC) group, an herbs-partitioned moxibustion (HPM) group, a mild-warm moxibustion (MWM) group and a salicylazosulphapyridine (SASP) group, with 12 rats in each group. The CD model rats were treated with trinitrobenzene sulphonic acid to induce intestinal inflammation.

Author(s): 
Bao, Chun-Hui
Wu, Lu-Yi
Shi, Yin
Wu, Huan-Gan
Liu, Hui-Rong
Zhang, Rong
Yu, Li-Qing
Wang, Jin-Hai
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