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Recombinant TsP53 modulates intestinal epithelial barrier integrity via upregulation of ZO‑1 in LPS‑induced septic mice.

Tight junctions (TJs) are a critical component in maintaining the intestinal mucosal barrier function and gastrointestinal health of animals. Gut barrier dysfunction contributes to the initiation and development of sepsis which induces an uncontrollable systemic inflammatory response and gives rise to life‑threatening clinical conditions. Excretory‑secretary antigens from Trichimella spiralis (T. spiralis) have been reported to protect from sepsis in a mouse model, however the mechanism remains to be elucidated. Mice were treated with recombinant T. spiralis 53‑kDa glycoprotein (rTsP53) at 2 or 6 h following lipopolysaccharide (LPS) injection. Survival rate, serum systemic inflammation, Chiu's score, D‑lactic acid (D‑LA) and diamine oxidase (DAO) as intestinal injured biomarkers, bacterial translocation and growth in peritoneal fluid (PF) and mesenteric lymph nodes (MLN), intestinal tight junction structure and protein zona occludens (ZO)‑1 expression were investigated. In LPS‑induced septic mice, rTsP53 was demonstrated to protract the survival and inhibit serum systemic inflammatory response, and then, allayed morphological alteration, decreased the release of D‑LA and DAO from intestines. Furthermore, LPS‑induced intestinal permeability, bacterial translocation and growth in PF, MLN and vital organs were significantly suppressed by rTsP53 treatment. Notably, rTsP53 treatment markedly improved the intestinal tight junction damaged in sepsis via promoting ZO‑1 expression. These results demonstrated that rTsP53 ameliorated LPS‑induced intestinal injury and is a potential protective agent for treatment of sepsis.

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Impaired function of the intestinal barrier in a novel sub-health rat model.

Sub-health is a state featuring a deterioration in physiological function between health and illness, and the sub-health condition has surfaced as life-threatening in humans. The aim of the present study was to establish a sub-health model in rats, and investigate the function of the intestinal barrier in the sub-health rats and rats following intervention. To establish a sub‑health model, the rats were subjected to a high‑fat and sugar diet, motion restriction and chronic stress. Their serum glucose and triglyceride levels, immune function and adaptability were then measured. The levels of diamine oxidase and D‑lactic acid in the plasma were analyzed as markers of the intestinal permeability. The protein and mRNA expression levels of anti‑apoptotic YWHAZ in the colonic tissue was detected using immunohistochemical and reverse transcription‑quantitative polymerase chain reaction analyses In the present study, the sub‑health rat model was successfully established, and sub‑health factors increased the intestinal permeability and reduced the expression of YWHAZ. Providing sub‑health rats with normal living conditions did not improve the function of the intestinal barrier. In conclusion, the results of the present study demonstrated that intestinal disorders in the sub‑health rat model may result from the damage caused by reduce intestinal barrier function as well as the decreased expression levels of YWHAZ. Additionally, rats in the sub‑health condition did not recover following subsequent exposure to normal living conditions, suggesting that certain exercises or medical intervention may be necessary to improve sub-health symptoms.

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