RD-5 is a native immune substance produced by Paneth’s cells in the intestinal crypt, which is believed to play a role in gut barrier function15. == Material & Methods == The present study was carried out at the Department of Animal Laboratory, Sun Yat-sen University, Guangzhou, Guangdong, PR China. and caspase 3 activity (P<0.01). Moreover, RD-5 mRNA expression was significantly higher in ulinastatin-treated CLP animals than saline controls (P<0.05). These results suggested a preserved integrity and function of the gut barrier. Significantly lower plasma TNF and IL-6 levels were detected in CLP rats with ulinastatin treatment, which contributed to increased survival time. IL7 == Interpretation & conclusions: == Our results suggest that Befetupitant ulinastatin has a therapeutic potential to prevent gut barrier dysfunction in the early stage of sepsis, thereby improving the outcome of sepsis. Further studies need to be done to understand the mechanism of action of ulinastatin. Keywords:Gut barrier – IL-6, sepsis, TNF-, ulinastatin Sepsis is an increasingly common and lethal condition among hospitalized patients and has become a leading cause of morbidity in severe illness, influencing millions of people worldwide and killing over one in four of those affected every year1,2. Conventional treatment for sepsis includes controlling the source of infection, antimicrobial therapy, and prevention of multiple organ failure due to sepsis. Recent strategies have targeted proinflammatory mediators such as tumour necrosis factor- (TNF-), interleukin-1 (IL-1), bradykinin, platelet-activating factor, elastase, nitric oxide (NO) and lipopolysaccharide (LPS), and activated protein C but their benefits on clinical outcome of septic patients remain controversial3,4. Only Drotrecogin alfa, a recombinant form of human activated protein C, can slightly improve the survival rate of patients with severe septic or septic shock5. Therefore, more effective therapies need to be developed for sepsis. The gut contains endogenous and exogenous microorganisms that can sometimes become potential pathogens of sepsis, and it is also susceptive to ischaemia-reperfusion injuries due to sepsis6. Gut barrier integrity is an important defense against microbial pathogens. Befetupitant Its damage may lead to the escape of microbial pathogens from gut into body, inducing an exaggerated inflammatory response and consequently promoting multiple organ dysfunction and failure7,8. The pathogenesis of gut barrier dysfunction during sepsis is multifactorial, and involves mucosal hypoperfusion, intestinal epithelial atrophy and depletion of mucosal immune cells and some cytokines (e.g. TNF- and IL-6,etc.)6,9. Therefore, novel interventions targeting gut barrier dysfunction and relevant pathogenic factors may reduce bacterial translocation and unfavourable inflammatory responses, thereby improving survival during sepsis. Urinary trypsin inhibitors (UTI) have been shown to benefit Befetupitant hypoperfusion in lung transplantation10,11and haemorrhagic shock12, and reduce endothelial dysfunction and leukocyte migration13. A clinical trial14showed that in addition to standard supportive care and antimicrobial therapy, treatment with combined ulinastatin, a UTI extracted from human urine, plus thymosin 1significantly increased the survival rate of patients with severe sepsis. However, the underlying mechanism of such benefits has not been systematically studied yet, especially the impacts on gut barrier function. We, therefore, conducted the present study using a rat model of sepsis induced by ceacal ligation and puncture (CLP) to investigate whether UTI has an effect on the outcome of sepsis and the underlying mechanisms. RNA expression of rat defensins-5(RD-5) was also measured. RD-5 is a native immune substance produced by Paneth’s cells in the intestinal crypt, which is believed to play a role in gut barrier function15. == Material & Methods == The present study was carried out at the Department of Animal Laboratory, Sun Yat-sen University, Guangzhou, Guangdong, PR China. Male Sprague-Dawley rats (n=92), weighing 140-220 g, were obtained from the Animal Center of Sun Yat-sen University. All rats were kept individually in polycarbonate cages with free access to standard rodent chow and tap water in a temperature-controlled environment (21 2C, lights on 0700 to 1900 h). The study protocol was approved by the Institutional Animal Care and Use Committee of Sun Yat-sen University and conducted in accordance with institutional guidelines. Experimental model of sepsis: Sepsis was induced by CLP as described previously16, which is the most commonly used preclinical model for studying the process and the treatment of sepsis17. After anaesthetized by an intraperitoneal injection of sodium pentobarbital (45 mg/kg), a midline laparotomy was performed and.
