Alkaline sphingomyelinase deficiency impairs intestinal mucosal barrier integrity and reduces antioxidant capacity in dextran sulfate sodium-induced colitis

BACKGROUND Ulcerative colitis is a chronic inflammatory disease of the colon with an unknown etiology.Alkaline sphingomyelinase(alk-SMase)is specifically expressed by intestinal epithelial cells,and has been reported to play an anti-inflammatory role.However,the underlying mechanism is still unclear.AIM To explore the mechanism of alk-SMase anti-inflammatory effects on intestinal barrier function and oxidative stress in dextran sulfate sodium(DSS)-induced colitis.METHODS Mice were administered 3%DSS drinking water,and disease activity index was determined to evaluate the status of colitis.Intestinal permeability was evaluated by gavage administration of fluorescein isothiocyanate dextran,and bacterial translocation was evaluated by measuring serum lipopolysaccharide.Intestinal epithelial cell ultrastructure was observed by electron microscopy.Western blotting and quantitative real-time reverse transcription-polymerase chain reaction were used to detect the expression of intestinal barrier proteins and mRNA,respectively.Serum oxidant and antioxidant marker levels were analyzed using commercial kits to assess oxidative stress levels.RESULTS Compared to wild-type(WT)mice,inflammation and intestinal permeability in alk-SMase knockout(KO)mice were more severe beginning 4 d after DSS induction.The mRNA and protein levels of intestinal barrier proteins,including zonula occludens-1,occludin,claudin-3,claudin-5,claudin-8,mucin 2,and secretory immunoglobulin A,were significantly reduced on 4 d after DSS treatment.Ultrastructural observations revealed progressive damage to the tight junctions of intestinal epithelial cells.Furthermore,by day 4,mitochondria appeared swollen and degenerated.Additionally,compared to WT mice,serum malondialdehyde levels in KO mice were higher,and the antioxidant capacity was significantly lower.The expression of the transcription factor nuclear factor erythroid 2-related factor 2(Nrf2)in the colonic mucosal tissue of KO mice was significantly decreased after DSS treatment.mRNA levels of Nrf2-regulated downstream antioxidant enzymes were also decreased.Finally,colitis in KO mice could be effectively relieved by the injection of tertiary butylhydroquinone,which is an Nrf2 activator.CONCLUSION Alk-SMase regulates the stability of the intestinal mucosal barrier and enhances antioxidant activity through the Nrf2 signaling pathway.

Dietary supplementation of bilberry anthocyanin on growth performance,intestinal mucosal barrier and cecal microbes of chickens challenged with Salmonella Typhimurium

Background Anthocyanins(AC)showed positive effects on improving the intestinal health and alleviating intestinal pathogen infections,therefore,an experiment was conducted to explore the protective effects of supplemented AC on Salmonella-infected chickens.Methods A total of 240 hatchling chickens were randomly allocated to 4 treatments,each with 6 replicates.Birds were fed a basal diet supplemented with 0(CON,and ST),100(ACL)and 400(ACH)mg/kg of AC for d 60,and orally challenged with PBS(CON)or 10^(9) CFU/bird(ST,ACL,ACH)Salmonella Typhimurium at d 14 and 16.Results(1)Compared with birds in ST,AC supplementation increased the body weight(BW)at d 18 and the average daily gain(ADG)from d 1 to 18 of the Salmonella-infected chickens(P<0.05);(2)AC decreased the number of Salmonella cells in the liver and spleen,the contents of NO in plasma and inflammatory cytokines in ileal mucosa of Salmonella-infected chickens(P<0.05);(3)Salmonella infection decreased the ileal villi height,villi height to crypt depth(V/C),and the expression of zonulaoccludins-1(ZO-1),claudin-1,occludin,and mucin 2(MUC2)in ileal mucosa.AC supplementation relieved these adverse effects,and decreased ileal crypt depth(P<0.05);(4)In cecal microbiota of Salmonella-infected chickens,AC increased(P<0.05)the alpha-diversity(Chao1,Pd,Shannon and Sobs indexes)and the relative abundance of Firmicutes,and decreased(P<0.05)the relative abundance of Proteobacteria and Bacteroidota and the enrichment of drug antimicrobial resistance,infectious bacterial disease,and immune disease pathways.Conclusions Dietary AC protected chicken against Salmonella infection via inhibiting the Salmonella colonization in liver and spleen,suppressing secretion of inflammatory cytokines,up-regulating the expression of ileal barrier-related genes,and ameliorating the composition and function of cecal microbes.Under conditions here used,100 mg/kg bilberry anthocyanin was recommended.

Olive oil ameliorate allergic response in ovalbumin-induced food allergy mouse by promoting intestinal mucosal immunity

The numerous health benefits of olive oil are widely known,however,it also provides anti-allergic properties that have not yet been fully defined.In this study,the anti-allergic activity of olive oil was evaluated by analyzing the clinical symptoms and immune-related factors in BALB/c mice that had ingested600 mg/(kg·day)olive oil for two weeks prior to the evaluation.An allergy model was subsequently constructed for analysis,the results of which showed that the olive oil reduced the scores of allergic symptoms in the mice,and up-regulated the hypothermia and the decline in the immune organ index.Moreover,fewer allergy-related cytokines and reduced intestinal inflammation was discovered in the olive oil-treated group.In addition,analysis of intestinal mucosal immune-related factors revealed that the olive oil promoted the expression of intestinal tight junction proteins(Claudin-1,Occludin,and ZO-1)and IL-22,and helped maintain the integrity of the intestinal epithelial physical barrier.Increased levels of mucin 2 andβ-defensin were also found in the intestinal mucus of the olive oil-treated mice.These findings suggest that the oral administration of olive oil effectively attenuated the ovalbumin-induced allergic immune response in the mice,and had a positive effect on intestinal epithelial mucosal immunity.

Wumei pills attenuates 5-fluorouracil-induced intestinal mucositis through Toll-like receptor 4/myeloid differentiation factor 88/nuclear factor-κB pathway and microbiota regulation

BACKGROUND Radiotherapy and chemotherapy can kill tumor cells and improve the survival rate of cancer patients.However,they can also damage normal cells and cause serious intestinal toxicity,leading to gastrointestinal mucositis[1].Traditional Chinese medicine is effective in improving the side effects of chemotherapy.Wumei pills(WMP)was originally documented in the Treatise on Exogenous Febrile Diseases.It has a significant effect on chronic diarrhea and other gastrointestinal diseases,but it is not clear whether it affects chemotherapy induced intestinal mucositis(CIM).AIM To explore the potential mechanism of WMP in the treatment of CIM through experimental research.METHODS We used an intraperitoneal injection of 5-fluorouracil(5-Fu)to establish a CIM mouse model and an oral gavage of WMP decoction(11325 and 22650 mg/kg)to evaluate the efficacy of WMP in CIM.We evaluated the effect of WMP on CIM by observing the general conditions of the mice(body weight,food intake,spleen weight,diarrhea score,and hematoxylin and eosin stained tissues).The expression of tumor necrosis factor-α(TNF-α),interleukin-6(IL-6),IL-1β,and myeloperoxidase(MPO),as well as the Toll-like receptor 4/myeloid differentiation factor 88/nuclear factor-κB(TLR4/MyD88/NF-κB)signaling pathway proteins and tight junction proteins(zonula occludens-1,claudin-1,E-cadherin,and mucin-2)was determined.Furthermore,intestinal permeability,intestinal flora,and the levels of short-chain fatty acids(SCFA)were also assessed.RESULTS WMP effectively improved the body weight,spleen weight,food intake,diarrhea score,and inflammatory status of the mice with intestinal mucositis,which preliminarily confirmed the efficacy of WMP in CIM.Further experiments showed that in addition to reducing the levels of TNF-α,IL-1β,IL-6,and MPO and inhibiting the expression of the TLR4/MyD88/NF-κB pathway proteins,WMP also repaired the integrity of the mucosal barrier of mice,regulated the intestinal flora,and increased the levels of SCFA(such as butyric acid).CONCLUSION WMP can play a therapeutic role in CIM by alleviating inflammation,restoring the mucosal barrier,and regulating gut microbiota.

Protective effect of clodronate-containing liposomes on intestinal mucosal injury in rats with severe acute pancreatitis

BACKGROUND: Severe acute pancreatitis (SAP) can result in intestinal mucosal injury. This study aimed to demonstrate the protective effect of clodronate-containing liposomes on intestinal mucosal injury in rats with SAP. METHODS: Liposomes containing clodronate or phosphate buffered saline (PBS) were prepared by the thin-film method SAP models were prepared by a uniform injection of sodium taurocholate (2 mL/kg body weight) into the subcapsular space of the pancreas. Sprague-Dawley rats were randomly divided into a control group (C group), a SAP plus PBS-containing liposomes group (P group) and a SAP plus clodronate-containing liposomes group (T group). At 2 and 6 hours after the establishment of SAP models, 2 mL blood samples were taken from the superior mesenteric vein to measure the contents of serum TNF-α and IL-12. Pathological changes in the intestine and pancreas were observed using hematoxylin and eosin staining, while apoptosis was detected using TUNEL staining. In addition, the macrophage markers cluster of differentiation 68 (CD68) in the intestinal tissue was assessed with immunohistochemistry. RESULTS: At the two time points, the levels of TNF-α and IL-12 in the P group were higher than those in the C group (P<0.05) Compared with the P group, the levels of TNF-α and IL-12 decreased in the T group (P<0.05). The pathological scores of the intestinal mucosa and pancreas in the T group were lower than those of the P group. In the T group, large numbers of TUNEL-positive cells were observed, but none or few in the C and P groups. The number of CD68-positive macrophages decreased in the T group.CONCLUSIONS: Clodronate-containing liposomes have prote- ctive effects against intestinal mucosal injury in rats with SAP. The blockade of macrophages may provide a novel therapeutic strategy in SAP.

Resveratrol alleviates intestinal mucosal barrier dysfunction in dextran sulfate sodium-induced colitis mice by enhancing autophagy

BACKGROUND Intestinal mucosal barrier dysfunction plays an important role in the pathogenesis of ulcerative colitis(UC).Recent studies have revealed that impaired autophagy is associated with intestinal mucosal dysfunction in the mucosa of colitis mice.Resveratrol exerts anti-inflammatory functions by regulating autophagy.AIM To investigate the effect and mechanism of resveratrol on protecting the integrity of the intestinal mucosal barrier and anti-inflammation in dextran sulfate sodium(DSS)-induced ulcerative colitis mice.METHODS Male C57BL/6 mice were divided into four groups:negative control group,DSS model group,DSS+resveratrol group,and DSS+5-aminosalicylic acid group.The severity of colitis was assessed by the disease activity index,serum inflammatory cytokines were detected by enzyme-linked immunosorbent assay.Colon tissues were stained with haematoxylin and eosin,and mucosal damage was evaluated by mean histological score.The expression of occludin and ZO-1 in colon tissue was evaluated using immunohistochemical analysis.In addition,the expression of autophagy-related genes was determined using reverse transcription-polymerase chain reaction and Western-blot,and morphology of autophagy was observed by transmission electron microscopy.RESULTS The resveratrol treatment group showed a 1.72-fold decrease in disease activity index scores and 1.42,3.81,and 1.65-fold decrease in the production of the inflammatory cytokine tumor necrosis factor-α,interleukin-6 and interleukin-1β,respectively,in DSS-induced colitis mice compared with DSS group(P<0.05).The expressions of the tight junction proteins occludin and ZO-1 in DSS model group were decreased,and were increased in resveratrol-treated colitis group.Resveratrol also increased the levels of LC3B(by 1.39-fold compared with DSS group)and Beclin-1(by 1.49-fold compared with DSS group)(P<0.05),as well as the number of autophagosomes,which implies that the resveratrol may alleviate intestinal mucosal barrier dysfunction in DSS-induced UC mice by enhancing autophagy.CONCLUSION Resveratrol treatment decreased the expression of inflammatory factors,increased the expression of tight junction proteins and alleviated UC intestinal mucosal barrier dysfunction;this effect may be achieved by enhancing autophagy in intestinal epithelial cells.

Glucagon-like peptide-2 protects impaired intestinal mucosal barriers in obstructive jaundice rats

AIM: To observe the protective effect of glucagon-like peptide-2(GLP-2) on the intestinal barrier of rats with obstructive jaundice and determine the possible mechanisms of action involved in the protective effect.METHODS: Thirty-six Sprague-Dawley rats were randomly divided into a sham operation group, an obstructive jaundice group, and a GLP-2 group; each group consisted of 12 rats. The GLP-2 group was treated with GLP-2 after the day of surgery, whereas the other two groups were treated with the same concentration of normal saline. Alanine aminotransferase(ALT), total bilirubin, and endotoxin levels were recorded at 1, 3, 7, 10 and 14 d. Furthermore, on the 14 th day, body weight, the wet weight of the small intestine, pathological changes of the small intestine and the immunoglobulin A(Ig A) expressed by plasma cells located in the small intestinal lamina propria were recorded for each group.RESULTS: In the rat model, jaundice was obvious, and the rats' activity decreased 4-6 d post bile duct ligation. Compared with the sham operation group, the obstructive jaundice group displayed increased yellow staining of abdominal visceral serosa, decreased small intestine wet weight, thinning of the intestinal muscle layer and villi, villous atrophy, uneven height, fusion, partial villous epithelial cell shedding, substantial inflammatory cell infiltration and significantly reduced Ig A expression. However, no significant gross changes were noted between the GLP-2 and sham groups. With time, the levels of ALT, endotoxin and bilirubin in the GLP-2 group were significantly increased compared with the sham group(P < 0.01). The increasing levels of the aforementioned markers were more significant in the obstructive jaundice group than in the GLP-2 group(P < 0.01).CONCLUSION: GLP-2 reduces intestinal mucosal injuries in obstructive jaundice rats, which might be attributed to increased intestinal Ig A and reduced bilirubin and endotoxin.

Preventive effect of tetramethylpyrazine on intestinal mucosal injury in rats with acute necrotizing pancreatitis

AIM: To evaluate the role of microcirculatory disorder (MCD) and the therapeutic effectiveness of tetramethyl- pyrazine (TMP) on intestinal mucosa injury in rats with acute necrotizing pancreatitis (ANP). METHODS: A total of 192 Sprague-Dawley rats were randomly divided into three groups: normal control group (C group), ANP group not treated with TMP (P group), ANP group treated with TMP (T group). An ANP model was induced by injection of 50 g/L sodium tau- rocholate under the pancreatic membrane (4 mL/kg). C group received isovolumetric injection of 9 g/L physi- ological saline solution using the same method. T group received injection of TMP (10 mL/kg) via portal vein. Ra- dioactive biomicrosphere technique was used to measure the blood flow at 0.5, 2, 6 and 12 h after the induction of ANP. Samples of pancreas, distal ileum were collected to observe pathological changes using a validated histol- ogy score. Intestinal tissues were also used for examina- tion of myeloperoxidase (MPO) expressed intracellularly in azurophilic granules of neutrophils. RESULTS: The blood flow was significantly lower in P group than in C group (P < 0.01). The pathological changes were aggravated significantly in P group. The longer the time, the severer the pathological changes. The intestinal MPO activities were significantly higher in P group than in C group (P < 0.01). The blood flow of intestine was significantly higher in T group than in P group after 2 h (P < 0.01). The pathological changes were alleviated significantly in T group. MPO activities were significantly lower in T group than in P group (P < 0.01 or P < 0.05). There was a negative correlation be- tween intestinal blood flow and MPO activity (r = -0.981, P < 0.01) as well as between intestinal blood flow and pathologic scores (r = -0.922, P < 0.05).CONCLUSION: MCD is an important factor for intestinal injury in ANP. TMP can ameliorate the condition of MCD and the damage to pancreas and intestine.

Diverse expression patterns of mucin 2 in colorectal cancer indicates its mechanism related to the intestinal mucosal barrier

BACKGROUND Abnormal expression patterns of mucin 2(MUC2)have been reported in a variety of malignant tumors and precancerous lesions.Reduced MUC2 expression in the intestinal mucosa,caused by various pathogenic factors,is related to mechanical dysfunction of the intestinal mucosa barrier and increased intestinal mucosal permeability.However,the relationship between MUC2 and the intestinal mucosal barrier in patients with colorectal cancer(CRC)is not clear.AIM To explore the relationship between MUC2 and intestinal mucosal barrier by characterizing the multiple expression patterns of MUC2 in CRC.METHODS Immunohistochemical staining was performed on intestinal tissue specimens from 100 CRC patients,including both cancer tissues and adjacent normal tissues.Enzyme-linked immunosorbent assays were performed on preoperative sera from 66 CRC patients and 20 normal sera to detect the serum levels of MUC2,diamine oxide(DAO),and D-lactate(D-LAC).The relationship between MUC2 expression and clinical parameters was calculated by theχ2 test or Fisher’s exact test.Prognostic value of MUC2 was evaluated by Kaplan-Meier curve and log-rank tests.RESULTS Immunohistochemical staining of 100 CRC tissues showed that the expression of MUC2 in cancer tissues was lower than that in normal tissues(54%vs 79%,P<0.05),and it was correlated with tumor-node-metastasis(TNM)stage and lymph node metastasis in CRC patients(P<0.05).However,the serum level of MUC2 in CRC patients was higher than that in normal controls,and was positively associated with serum levels of human DAO(χ2=3.957,P<0.05)and D-LAC(χ^(2)=7.236,P<0.05),which are the biomarkers of the functional status of the intestinal mucosal barrier.And the serum level of MUC2 was correlated with TNM stage,tumor type,and distant metastasis in CRC patients(P<0.05).Kaplan-Meier curves showed that decreased MUC2 expression in CRC tissues predicted a poor survival.CONCLUSION MUC2 in tissues may play a protective role by participating in the intestinal mucosal barrier and can be used as an indicator to evaluate the prognosis of CRC patients.

Dahuang Fuzi decoction reduces inflammation levels and alleviates intestinal mucosal barrier damage in septic rats

Objective:To investigate the protective effect of Dahuang Fuzi Decoction(DHFZD),a traditional Chinese prescription,at alleviating sepsis-induced inflammation and gut barrier damage in rats.Methods:Forty clean-grade male Sprague-Dawley rats were divided randomly into three groups:normal control group(NCG,n?10),model control group(MCG,n?15)and DHFZD-treated group(DHFZDG,n?15).NCG rats were sham operated on and used as the controls,whereas MCG and DHFZDG rats were used to replicate the rat sepsis model using cecal ligation and puncture(CLP).The DHFZDG rats received DHFZD by gavage(4.5 mg/g of body weight)2 h prior to CLP and after its successful induction,while the NCG and MCG rats received equivalent amounts of sterilized water by gavage.All rat groups were starved and had free access to water.At 24 h post-experimental set up,the mortality of rats in each group was recorded,and peritoneal inflammation assessment and pathological changes related to the intestinal mucosal injury index(IMII)in the surviving rats were evaluated.D-lactic acid,tumor necrosis factor(TNF)-a,interleukin(IL)-6 and IL-10 peripheral blood concentrations,along with secretory immunoglobulin A(sIgA)in the intestinal mucosa were evaluated by enzyme-linked immunosorbent assays.Gut microbes were detected using 16S rRNA gene sequencing.Results:DHFZD reduced sepsis-related mortality in the rats.Moreover,it alleviated peritoneal inflammation and pathological changes according to the IMII.DHFZD reduced serum procalcitonin,TNF-a and IL-6 concentrations,but not the IL-10 concentration.It also reduced serum D-lactic acid and increased sIgA concentrations in intestinal mucosa.Notably,DHFZDG restored gut microbiota diversity and regulated the decrease in Bacteroidetes induced by sepsis,compared with the MCG rats.Conclusion:DHFZDG may play a protective role in sepsis by alleviating sepsis-induced inflammation and gut barrier damage in rats.

Dynamic changes of IL-2/IL-10, sFas and expression of Fas in intestinal mucosa in rats with acute necrotizing pancreatitis

AIM:To investigate dynamic changes of serum IL-2, IL-10, IL-2/IL-10 and sFas in rats with acute necrotizing pancreatitis. To explore the expression of Fas in intestinal mucosa of rats with acute necrotizing pancreatitis (ANP). METHODS:A total of 64 Sprague-Dawley (SD) rats were randomly divided into two groups:normal control group (C group), ANP group (P group). An ANP model was induced by injection of 50 g/L sodium taurocholate under the pancreatic membrane. Normal control group received isovolumetric injection of 9 g/L physiological saline solution using the same method. The blood samples of the rats in each group were obtained via superior mesenteric vein to measure levels of IL-2, IL-10, sFas and calculate the value of IL-2/IL-10. The levels of IL-2, IL-10 and sFas were determined by ELISA. The severity of intestinal mucosal injury was evaluated by pathologic score. The expression of Fas in intestinal mucosal tissue was determined by immunohistochemistry staining. RESULTS:Levels of serum IL-2 were significantly higher in P group than those of C group (2.79 ± 0.51 vs 3.53 ± 0.62, 2.93 ± 0.89 vs 4.35 ± 1.11, 4.81 ± 1.23 vs 6.94 ± 1.55 and 3.41 ± 0.72 vs 4.80 ± 1.10, respectively, P < 0.01, for all) and its reached peak at 6 h. Levels of serum IL-10 were significantly higher in P group than those of C group at 6 h and 12 h (54.61 ± 15.81 vs 47.34 ± 14.62, 141.15 ± 40.21 vs 156.12 ± 43.10, 89.18 ± 32.52 vs 494.98 ± 11.23 and 77.15 ± 22.60 vs 93.28 ± 25.81, respectively, P < 0.01, for all). The values of IL-2/IL-10 were higher significantly in P group than those of C group at 0.5 h and 2 h (0.05 ± 0.01 vs 0.07 ± 0.02 and 0.02 ± 0.01 vs 0.03 ± 0.01, respectively, P < 0.01, for all), and it were significantly lower than those of C group at 6 h (0.05 ± 0.02 vs 0.01 ± 0.01, P < 0.01) and returned to the control level at 12 h (0.04 ± 0.01 vs 0.05 ± 0.02, P > 0.05). In sFas assay, there was no significant difference between P group and C group (3.16 ± 0.75 vs 3.31 ± 0.80, 4.05 ± 1.08 vs 4.32 ± 1.11, 5.93 ± 1.52 vs 5.41 ± 1.47 and 4.62 ± 1.23 vs 4.44 ± 1.16, respectively, P > 0.05, for all). Comparison of P group and C group, the pathological changes were aggravated significantly in P group. Immunohistochemistry staining show the expression of Fas was absent in normal intestinal tissues, however, it gradually increased after induction of pancreatitis in intestinal tissue, then reached their peaks at 12 h.CONCLUSION:Fas were involved in the pathogenesis of pancreatitis associated intestinal injury. The mechanisms of Fas may be associated to Fas mediated T helper cell apoptosis.

Intestinal mucosal atrophy and adaptation

Mucosal adaptation is an essential process in gut homeostasis.The intestinal mucosa adapts to a range of pathological conditions including starvation,short-gut syndrome,obesity,and bariatric surgery.Broadly,these adaptive functions can be grouped into proliferation and differentiation.These are influenced by diverse interactions with hormonal,immune,dietary,nervous,and mechanical stimuli.It seems likely that clinical outcomes can be improved by manipulating the physiology of adaptation.This review will summarize current understanding of the basic science surrounding adaptation,delineate the wide range of potential targets for therapeutic intervention,and discuss how these might be incorporated into an overall treatment plan.Deeper insight into the physiologic basis of adaptation wil identify further targets for intervention to improve clinical outcomes.

Effects of Faecalibacterium prausnitzii intervention on immune response, intestinal flora and intestinal mucosal barrier of mice with ulcerative colitis

Objective: To study the effects of Faecalibacterium prausnitzii intervention on immune response, intestinal flora and intestinal mucosal barrier of mice with ulcerative colitis (UC). Methods: C57BL/6J mice were randomly divided into control group, UC group and Faecalibacterium prausnitzii group, the latter two groups were made into UC models by trinitrobenzene sulfonic acid enema and F. prausnitzii group were given intragastric administration of F. prausnitzii solution for intervention. The differences in immune response, intestinal flora, and intestinal mucosal barrier were compared among the three groups after 7 days of intervention. Results: The interleukin-10 (IL-10) and transforming growth factor-β1 (TGF-β1) contents in serum, the fork head box P3 (Foxp3), zonula occludens-1 (ZO-1), occludin, claudin-1 and claudin-2 expression in intestinal mucosa as well as the number of bifidobacterium and lactobacillus in feces of the UC group were significantly lower than those of the control group whereas the interleukin-17 (IL-17), diamine oxidase (DAO) and D-lactic acid (D-LA) contents in serum, the retinoid-related orphan nuclear receptor γt (RORγt) expression in intestinal mucosa as well as the number of enterobacter and enterococcus in feces were significantly higher than those of the control group (P<0.05);IL-10 and TGF-β1 contents in serum, Foxp3, ZO-1, occludin, claudin-1 and claudin-2 expression in intestinal mucosa as well as the number of bifidobacterium and lactobacillus in feces of the F. prausnitzii group were significantly higher than those of the UC group whereas IL-17, DAO and D-LA contents in serum, RORγt expression in intestinal mucosa as well as the number of enterobacter and enterococcus in feces were significantly lower than those of the UC group (P<0.05). Conclusion: Faecalibacterium prausnitzii intervention can improve the Th17/Treg immune response, intestinal flora and intestinal mucosal barrier in UC mice.

Effect of electroacupunture on gastric mucosal intestinal trefoil factor gene expression of stress-induced gastric mucosal injury in rats

瞄准：在 Foot-Yangming ( SMFY )的胃顶点的 acupoints 调查电镀物品针灸( EA )，胃的粘膜的肠的翘摇上的 Foot-Yangming ( SMFY )的胆囊顶点在有胃的粘膜的导致压力的老鼠的因素( ITF )基因表示察觉损害，并且探索EA相关的胃的粘膜的规章的机制和意义保护的效果。方法：四十只老鼠随机被划分成 4 个组：空白的组，为组建模，在 SMFY 组(“ SMFY 组”) 的 acupoints 为 group+EA 建模，并且为在 GMFY 组(GMFY 组) 的 acupoints 的 group+EA 建模。所有老鼠(除了空白的组) 走水路被成为模型沉浸和抑制应力(WRS ) 。然后，在每只老鼠的胃粘膜织物在对胃的粘膜损害索引(图形用户界面) 的评价以后被脱掉，并且纸巾的 ITF mRNA 的表示被反向的抄写聚合酶检测链反应(RT-PCR ) 方法。结果：与模型组相比(54.3+/- 1.34 )，在 SMFY 的图形用户界面价值组织(31+/- 2.21 )显著地减少了( P【 0.01 )，那么做了在 GMFY 组织(39.8+/- 1.62 ， P【 0.05 )，同时，在 SMFY 的图形用户界面价值组织比在 GMFY 组( P【 0.01 )显著地低。与模型组相比(0.65+/- 0.01 ) ， EA 有一个趋势改进胃的粘膜 ITFmRNA 的表示基因：如此的趋势在 GMFY 组存在(0.66+/- 0.01 ) 但是没有有效差量(P】0.05 ) ，在 SMFY 组(0.76+/- 0.01 ) 与极其明显的差别(P【 0.01 ) ，而且，在 SMFY 的表示组织比在 GMFY 组(P【 0.01 ) 显著地高。结论：由在 SMFY 和 GMFY 的 acupoints 的 EA 的胃的粘膜 protective 效果与 ITF 的表示变化有关，显示某些顶点特性存在。它能是为 TCM 理论的一个证明“在 SMFY 和胃之间的相对个性”。

Effect of Xingnaojing injection on intestinal mucosal barrier in septicemia and intracerebral hemorrhage mice

OBJECTIVE Xingnaojing injection(XNJ) is an extracts of Angong Niuhuang Pill that is a well-known traditional Chinese medicine used for the treatment of septicemia and stroke.This study aims to investigate the effect of XNJ on intestinal mucosal barrier in septicemia and intracerebral hem.orrhage(ICH) mice models.METHODS The septicemia mice models were induced by intravenous in.jection with lipopolysaccharide(20 mg·kg^(-1)).And the ICH mice models were made by intrastriatal injec.tion of bacterial collagenase.The septicemia animals were treated intravenously with XNJ at dose of2.5,5,10,or 15 mL·kg^(-1).The ICH animals were treated intravenously with XNJ at dose of 10 mL·kg^(-1).Thereafter,the permeability of intestinal mucosa was assayed by FITC-D method.RESULTS Com.pared with the control group(44.72±4.30),the permeability of intestinal mucosa in the mice in septice.mia group(233.68±28.18) was significantly increased(P<0.01).Treatment with XNJ at dose of 5,10,and 15 mL·kg^(-1) reduced the permeability of intestinal mucosa(150.45±17.52,139.21±17.05,132.55±18.88,respectively,P<0.01) except 2.5 mL·kg^(-1)(240.71±21.42,P>0.01);Compared with sham group(57.88±7.31),the permeability of intestinal mucosa in the mice of ICH(282.25±23.78) was significantly in.creased(P<0.01).Treatment with XNJ(10 mL·kg^(-1)) in the mice of ICH group ameliorated the change of permeability in intestinal mucosa(148.83±15.86,P<0.01).CONCLUSION XNJ exhibits the protec.tive effect on the intestinal mucosal barrier in septicemia and ICH,which will prevent the endotoxin to penetrate the intestinal mucosa and then to enter the circulation in infections and stress.

Protective effect of perioperative recombinant human growth hormone application on intestinal mucosal barrier function in patients with intestinal obstruction and the assessment of immune inflammatory response

Objective:To study the protective effect of perioperative recombinant human growth hormone (r-hGH) application on intestinal mucosal barrier function in patients with intestinal obstruction and the influence on the immune inflammatory response.Methods:60 patients with intestinal obstruction who underwent surgical treatment in our hospital between February 2013 and July 2016 were selected as the research subjects and divided into the control group (n=34) who received conventional surgical treatment and the observation group (n=26) who received surgery combined with perioperative r-hGH treatment. The serum levels of intestinal mucosal barrier indexes, immunoglobulin and inflammatory response indicators were compared between two groups of patients before and after treatment.Results: Before treatment, differences in serum levels of intestinal mucosal barrier indexes, immunoglobulin and inflammatory response indicators were not statistically significant between the two groups of patients. After treatment, serum intestinal mucosal barrier indexes Endotoxin, D-Lactate and DAO levels in observation group were lower than those in control group, immunoglobulin IgA, IgM and IgG levels were higher than those in control group, and inflammatory response indicators IL-1, IL-6, PCT and TNF-α levels were lower than those in control group patients. Conclusion:Perioperative r-hGH application in patients with intestinal obstruction can protect the intestinal mucosal barrier, also optimize the humoral immunity and suppress the systemic inflammatory response.

Cyclodextrin/chitosan nanoparticles for oral ovalbumin delivery: Preparation, characterization and intestinal mucosal immunity in mice

A novel oral protein delivery system with enhanced intestinal penetration and improved antigen stability based on chitosan(CS) nanoparticles and antigen-cyclodextrin(CD) inclusion complex was prepared by a precipitation/coacervation method. Ovalbumin(OVA) as a model antigen was firstly encapsulated by cyclodextrin, either β-cyclodextrin( β-CD) or carboxymethyl-hydroxypropyl-β-cyclodextrin(CM-HP-β-CD) and formed OVA-CD inclusion complexes, which were then loaded to chitosan nanoparticles to form OVA loaded β-CD/CS or CM-HP-β-CD/CS nanoparticles with uniform particle size(836.3 and 779.2 nm, respectively) and improved OVA loading efficiency(27.6% and 20.4%, respectively). In vitro drug release studies mimicking oral delivery condition of OVA loaded CD/CS nanoparticles showed low initial releases at p H 1.2 for 2 h less than 3.0% and a delayed release which was below to 30% at p H 6.8 for further 72 h. More importantly, after oral administration of OVA loaded β-CD/CS nanoparticles to Balb/c mice, OVA-specific sIgA levels in jejunum of OVA loaded β-CD/CS nanoparticles were 3.6-fold and 1.9-fold higher than that of OVA solution and OVA loaded chitosan nanoparticles, respectively. In vivo evaluation results showed that OVA loaded CD/CS nanoparticles could enhance its efficacy for inducing intestinal mucosal immune response. In conclusion, our data suggested that CD/CS nanoparticles could serve as a promising antigen-delivery system for oral vaccination.

Effect of glutamine nutrition support on the intestinal mucosal barrier function and inflammatory response in patients with severe acute pancreatitis

Objective:To study the effect of glutamine nutrition support on the intestinal mucosal barrier function and inflammatory response in patients with severe acute pancreatitis.Methods:Patients with severe acute pancreatitis who were treated in Pengzhou People's Hospital between May 2014 and November 2016 were selected as the research subjects and randomly divided into two groups, control group received conventional symptomatic treatment and conventional enteral nutrition intervention, and Gln group received conventional symptomatic treatment and glutamine enteral nutrition intervention. The contents of intestinal mucosal barrier damage markers and inflammatory mediators in serum as well as the expression of inflammatory signaling molecules in peripheral blood were detected before and after treatment;the number of intestinal flora was detected after treatment.Results:After treatment, LPS, DAO, HBD2, TNF-α, sTREM-1, IL-1β and IL-6 levels in serum as well as TLR4, NF-kB, MyD88 and p38MAPK mRNA expression in peripheral blood mononuclear cells of both groups of patients were significantly lower than those before treatment, LPS, DAO, HBD2, TNF-α, sTREM-1, IL-1β and IL-6 levels in serum as well as TLR4, NF-kB, MyD88 and p38MAPK mRNA expression in peripheral blood mononuclear cells of Gln group after treatment were significantly lower than those of control group, and the number of lactobacillus, bifidobacterium and bacteroides were significantly higher than those of control group while the number of escherichia coli and enterococcus were significantly lower than those of control group.Conclusion: Glutamine nutrition support for severe acute pancreatitis can reduce the intestinal mucosal barrier function injury and inhibit the inflammatory response activation.

Intestinal mucosal barrier in functional constipation:Dose it change?

BACKGROUND The intestinal mucosal barrier is the first line of defense against numerous harmful substances,and it contributes to the maintenance of intestinal homeostasis.Recent studies reported that structural and functional changes in the intestinal mucosal barrier were involved in the pathogenesis of several intestinal diseases.However,no study thoroughly evaluated this barrier in patients with functional constipation(FC).AIM To investigate the intestinal mucosal barrier in FC,including the mucus barrier,intercellular junctions,mucosal immunity and gut permeability.METHODS Forty FC patients who fulfilled the Rome IV criteria and 24 healthy controls were recruited in the Department of Gastroenterology of China-Japan Friendship Hospital.The colonic mucus barrier,intercellular junctions in the colonic epithelium,mucosal immune state and gut permeability in FC patients were comprehensively examined.Goblet cells were stained with Alcian Blue/Periodic acid Schiff(AB/PAS)and counted.The ultrastructure of intercellular junctional complexes was observed under an electron microscope.Occludin and zonula occludens-1(ZO-1)in the colonic mucosa were located and quantified using immunohistochemistry and quantitative real-time polymerase chain reaction.Colonic CD3+intraepithelial lymphocytes(IELs)and CD3+lymphocytes in the lamina propria were identified and counted using immunofluorescence.The serum levels of D-lactic acid and zonulin were detected using enzyme-linked immunosorbent assay.RESULTS Compared to healthy controls,the staining of mucus secreted by goblet cells was darker in FC patients,and the number of goblet cells per upper crypt in the colonic mucosa was significantly increased in FC patients(control,18.67±2.99;FC,22.42±4.09;P=0.001).The intercellular junctional complexes in the colonic epithelium were integral in FC patients.The distribution of mucosal occludin and ZO-1 was not altered in FC patients.No significant differences were found in occludin(control,5.76E-2±1.62E-2;FC,5.17E-2±1.80E-2;P=0.240)and ZO-1(control,2.29E-2±0.93E-2;FC,2.68E-2±1.60E-2;P=0.333)protein expression between the two groups.The mRNA levels in occludin and ZO-1 were not modified in FC patients compared to healthy controls(P=0.145,P=0.451,respectively).No significant differences were observed in the number of CD3+IELs per 100 epithelial cells(control,5.62±2.06;FC,4.50±2.16;P=0.070)and CD3+lamina propria lymphocytes(control,19.69±6.04/mm^(2);FC,22.70±11.38/mm^(2);P=0.273).There were no significant differences in serum D-lactic acid[control,5.21(4.46,5.49)mmol/L;FC,4.63(4.31,5.42)mmol/L;P=0.112]or zonulin[control,1.36(0.53,2.15)ng/mL;FC,0.94(0.47,1.56)ng/mL;P=0.185]levels between FC patients and healthy controls.CONCLUSION The intestinal mucosal barrier in FC patients exhibits a compensatory increase in goblet cells and integral intercellular junctions without activation of mucosal immunity or increased gut permeability.