scholarly journals Sustained suppression of IL-18 by employing a vaccine ameliorates intestinal inflammation in TNBS-induced murine colitis

2019 ◽  
Vol 5 (7) ◽  
pp. FSO405 ◽  
Author(s):  
Qingdong Guan ◽  
Richard Warrington ◽  
Sem Moreno ◽  
Gefei Qing ◽  
Carolyn Weiss ◽  
...  
Keyword(s):  
Intestinal Inflammation ◽  
Trinitrobenzene Sulfonic Acid ◽  
Colon Tissue ◽  
Murine Colitis ◽  
Virus Like Particle ◽  
Cytokine Levels ◽  
Ifn Γ ◽  
In Vivo Effects

Aim: To develop IL-18 peptide-based virus-like particle vaccines that elicit autoantibodies against IL-18 and to evaluate the in vivo effects of the vaccines in murine colitis. Methods: Recombinant IL-18 vaccines were constructed, and the effects of the vaccines were evaluated in trinitrobenzene sulfonic acid-induced acute and chronic colitis in mice. Results: Two murine IL-18 peptide-based vaccines (A and D) were developed, which induced relative long-lasting specific antibodies against IL-18. Vaccine-immunized mouse antisera could partially block IL-18-induced IFN-γ production in vitro. Mice receiving vaccine D, not vaccine A, had a significant decrease in intestinal inflammation, collagen deposition and pro-inflammatory cytokine levels in colon tissue. Conclusion: IL-18 vaccine may provide a potential therapeutic approach in the treatment of Crohn’s disease.

Characterization of the human intestinal CD98 promoter and its regulation by interferon-γ

2007 ◽  
Vol 292 (2) ◽  
pp. G535-G545 ◽  
Author(s):  
Yutao Yan ◽  
Guillaume Dalmasso ◽  
Shanthi Sitaraman ◽  
Didier Merlin
Keyword(s):  
Transcriptional Regulation ◽  
Intestinal Inflammation ◽  
Direct Sequencing ◽  
Interferon Γ ◽  
Initiation Site ◽  
Start Codon ◽  
Transcriptional Initiation ◽  
Ifn Γ

Growing evidence that epithelial CD98 plays an important role in intestinal inflammation focused our interest to investigate the transcriptional regulation of CD98. Our mouse-based in vivo and in vitro experiments revealed that epithelial colonic CD98 mRNA expression was transcriptionally increased in intestinal inflammation. We then isolated and characterized a 5′-flanking fragment containing the promoter region required for CD98 gene transcription. Primer extension and rapid amplification of 5′-cDNA ends were used to map a transcriptional initiation site 129 bp upstream from the translational start codon (ATG). Direct sequencing of the 5′-flanking region revealed the presence of four GC-rich stimulating protein (Sp)1 binding domains, one NF-κB binding domain, and no TATA box. Binding of Sp1 [Sp1(−874), SP1(−386), Sp1(−187), and Sp1(−177)] and NF-κB [NF-κB(−213)] to the promoter was confirmed by EMSA and supershift assays. Furthermore, chromatin immunoprecipitation experiments showed the in vivo DNA-Sp1 and DNA-NF-κB interactions under basal and IFN-γ-stimulated conditions. Reporter genes driven by serially truncated and site-mutated CD98 promoters were used to examine basal and IFN-γ-responsive transcription in transiently transfected Caco2-BBE cells. Our results revealed that Sp1(−187), Sp1(−177), and the NF-κB binding site were essential for basal and IFN-γ-stimulated CD98 promoter activities, whereas Sp1(−874) and Sp1(−386) were not. The results from additional site-mutated CD98 promoters suggested that Sp1(−187), Sp1(−177), and the NF-κB site may cooperate in mediating basal and IFN-γ-stimulated CD98 promoter activities. Finally, we demonstrated that a reduction of Sp1 or NF-κB expression reduced CD98 protein expression in unstimulated and IFN-γ-stimulated Caco2-BBE cells. Collectively, these findings indicate that the Sp1 and NF-κB transcription factors are likely to play a significant role in IFN-γ-mediated transcriptional regulation of CD98 in the intestinal epithelium, providing new insights into the regulation of CD98 expression in intestinal inflammation.

scholarly journals In vitro and in vivo effects of the probiotic Escherichia coli strain M-17: immunomodulation and attenuation of murine colitis

2008 ◽  
Vol 100 (03) ◽  
pp. 530-541 ◽  
Author(s):  
Leo R. Fitzpatrick ◽  
Jeffrey Small ◽  
Robert A. Hoerr ◽  
Eileen F. Bostwick ◽  
Lynn Maines ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Coli Strain ◽  
Murine Colitis ◽  
In Vivo Effects

Neutralization of interleukin-18 reduces severity in murine colitis and intestinal IFN-γ and TNF-α production

2001 ◽  
Vol 281 (4) ◽  
pp. R1264-R1273 ◽  
Author(s):  
Britta Siegmund ◽  
Giamila Fantuzzi ◽  
Florian Rieder ◽  
Fabia Gamboni-Robertson ◽  
Hans-Anton Lehr ◽  
...  
Keyword(s):  
Mononuclear Cells ◽  
Intestinal Inflammation ◽  
Ex Vivo ◽  
Experimental Colitis ◽  
Suppressive Effect ◽  
Confocal Laser ◽  
Colon Tissue ◽  
Lamina Propria Mononuclear Cells ◽  
Ifn Γ

Interleukin (IL)-18, initially described as interferon (IFN)-γ-inducing factor, is expressed in the inflamed mucosa of patients with Crohn's disease. To investigate the role of IL-18 in intestinal inflammation, the effect of neutralizing antimurine IL-18 antiserum in dextran sulfate sodium (DSS)-induced colitis in BALB/c and C57BL/6 mice was examined. During a dose response of DSS, levels of colonic IL-18 increased parallel with clinical worsening. With the use of confocal laser microscopy, the increased IL-18 was localized to the intestinal epithelial layer. Anti-IL-18 treatment resulted in a dose-dependent reduction of the severity of colitis in both BALB/c and C57BL/6 mice. Colon shortening following DSS-induced colitis was partially prevented in the treatment groups. In the colon tissue homogenates, IFN-γ concentrations were lower in the anti-IL-18-treated DSS-fed mice compared with untreated DSS-fed mice. This suppressive effect of anti-IL-18 administered in vivo was also observed on spontaneous tumor necrosis factor-α, IL-18, and IFN-γ production from ex vivo colon organ cultures. The stimulation of lamina propria mononuclear cells by IL-18 and IL-12 resulted in a synergistic increase in IFN-γ synthesis. These findings suggest that IL-18 is a pivotal mediator in experimental colitis.

scholarly journals Expression of Cav1.3 calcium channel in the human and mouse colon: posttranscriptional inhibition by IFNγ

2017 ◽  
Vol 312 (1) ◽  
pp. G77-G84 ◽  
Author(s):  
Vijayababu M. Radhakrishnan ◽  
Maryam M. Gilpatrick ◽  
Nour Alhoda Parsa ◽  
Pawel R. Kiela ◽  
Fayez K. Ghishan
Keyword(s):  
Transcriptional Repression ◽  
Intestinal Inflammation ◽  
Gene Promoter ◽  
Experimental Colitis ◽  
Trinitrobenzene Sulfonic Acid ◽  
Mineral Density ◽  
Altered Expression ◽  
Relative Contribution

It has been hypothesized that apically expressed L-type Ca2+channel Cav1.3 (encoded by CACNA1D gene) contributes toward an alternative TRPV6-independent route of intestinal epithelial Ca2+absorption, especially during digestion when high luminal concentration of Ca2+and other nutrients limit TRPV6 contribution. We and others have implicated altered expression and activity of key mediators of intestinal and renal Ca2+(re)absorption as contributors to negative systemic Ca2+balance and bone loss in intestinal inflammation. Here, we investigated the effects of experimental colitis and related inflammatory mediators on colonic Cav1.3 expression. We confirmed Cav1.3 expression within the segments of the mouse and human gastrointestinal tract. Consistent with available microarray data (GEO database) from inflammatory bowel disease (IBD) patients, mouse colonic expression of Cav1.3 was significantly reduced in trinitrobenzene sulfonic acid (TNBS) colitis. In vitro, IFNγ most potently reduced Cav1.3 expression. We reproduced these findings in vivo with wild-type and Stat1−/−mice injected with IFNγ. The observed effect in Stat1−/−suggested a noncanonical transcriptional repression or a posttranscriptional mechanism. In support of the latter, we observed no effect on the cloned Cav1.3 gene promoter activity and accelerated Cav1.3 mRNA decay rate in IFNγ-treated HCT116 cells. While the relative contribution of Cav1.3 to intestinal Ca2+absorption and its value as a therapeutic target remain to be established, we postulate that Cav1.3 downregulation in IBD may contribute to the negative systemic Ca2+balance, to increased bone resorption, and to reduced bone mineral density in IBD patients.

LPS-activated complement, not LPS per se, triggers the early release of PGE2 by Kupffer cells

2005 ◽  
Vol 289 (2) ◽  
pp. R332-R339 ◽  
Author(s):  
Vit Perlik ◽  
Zhongua Li ◽  
Sarita Goorha ◽  
Leslie R. Ballou ◽  
Clark M. Blatteis
Keyword(s):  
Kupffer Cells ◽  
Guinea Pigs ◽  
Vena Cava ◽  
Early Release ◽  
Tnf Α ◽  
Cytokine Levels ◽  
Per Se ◽  
In Vivo Effects

The intravenous injection of LPS rapidly evokes fever. We have hypothesized that its onset is mediated by prostaglandin (PG)E2 quickly released by Kupffer cells (Kc). LPS, however, does not stimulate PGE2 production by Kc as rapidly as it induces fever; but complement (C) activated by LPS could be the exciting agent. To test this hypothesis, we injected LPS (2 or 8 μg/kg) or cobra venom factor (CVF, an immediate activator of the C cascade that depletes its substrate, ultimately causing hypocomplementemia; 25 U/animal) into the portal vein of anesthetized guinea pigs and measured the appearance of PGE2, TNF-α, IL-1β, and IL-6 in the inferior vena cava (IVC) over the following 60 min. LPS (at both doses) and CVF induced similar rises in PGE2 within the first 5 min after treatment; the rises in PGE2 due to CVF returned to control in 15 min, whereas PGE2 rises due to LPS increased further, then stabilized. LPS given 3 h after CVF to the same animals also elevated PGE2, but after a 30- to 45-min delay. CVF per se did not alter basal PGE2 and cytokine levels and their responses to LPS. These in vivo effects were substantiated by the in vitro responses of primary Kc from guinea pigs to C (0.116 U/ml) and LPS (200 ng/ml). These results indicate that LPS-activated C rather than LPS itself triggers the early release of PGE2 by Kc.

scholarly journals The CD200 Regulates Inflammation in Mice Independently of TNF-α Production

2021 ◽  
Vol 22 (10) ◽  
pp. 5358
Author(s):  
Katarzyna Tonecka ◽  
Agata Braniewska ◽  
Zofia Pilch ◽  
Zuzanna Sas ◽  
Marcin Skorzynski ◽  
...  
Keyword(s):  
Immune Cells ◽  
Intestinal Inflammation ◽  
Activity Index ◽  
Disease Activity Index ◽  
Histological Evaluation ◽  
Bodyweight Loss ◽  
Colon Tissue ◽  
Tnf Α

Inflammatory bowel disease is characterized by the infiltration of immune cells and chronic inflammation. The immune inhibitory receptor, CD200R, is involved in the downregulation of the activation of immune cells to prevent excessive inflammation. We aimed to define the role of CD200R ligand-CD200 in the experimental model of intestinal inflammation in conventionally-reared mice. Mice were given a dextran sodium sulfate solution in drinking water. Bodyweight loss was monitored daily and the disease activity index was calculated, and a histological evaluation of the colon was performed. TNF-α production was measured in the culture of small fragments of the distal colon or bone marrow-derived macrophages (BMDMs) cocultured with CD200+ cells. We found that Cd200−/− mice displayed diminished severity of colitis when compared to WT mice. Inflammation significantly diminished CD200 expression in WT mice, particularly on vascular endothelial cells and immune cells. The co-culture of BMDMs with CD200+ cells inhibited TNF-α secretion. In vivo, acute colitis induced by DSS significantly increased TNF-α secretion in colon tissue in comparison to untreated controls. However, Cd200−/− mice secreted a similar level of TNF-α to WT mice in vivo. CD200 regulates the severity of DSS-induced colitis in conventionally-reared mice. The presence of CD200+ cells decreases TNF-α production by macrophages in vitro. However, during DDS-induced intestinal inflammation secretion of TNF-α is independent of CD200 expression.

scholarly journals Beneficial Role of Fruits, Their Juices, and Freeze-Dried Powders on Inflammatory Bowel Disease and Related Dysbiosis

Plants ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 4
Author(s):  
Maria Rosaria Perri ◽  
Carmen Romano ◽  
Mariangela Marrelli ◽  
Ludovica Zicarelli ◽  
Claudia-Crina Toma ◽  
...  
Keyword(s):  
Inflammatory Bowel Disease ◽  
Bowel Disease ◽  
Intestinal Inflammation ◽  
Inflammatory Conditions ◽  
Freeze Dried ◽  
Inflammatory Bowel ◽  
Genetic And Environmental Factors ◽  
In Vivo Effects

Inflammatory bowel disease (IBD) is a group of complex chronic inflammatory conditions affecting the gastrointestinal tract. It is linked to a number of genetic and environmental factors able to perturb the immune-microbiome axis. Diet is the most investigated variable both for its role in the etiology of IBD and for its beneficial potential in the treatment of the symptoms. Dietary products may influence intestinal inflammation through different mechanisms of action, such as the modulation of inflammatory mediators, the alteration of gene expression, changes in gut permeability, and modifications in enteric flora composition. A consisting number of studies deal with the link between nutrition and microbial community, and particular attention is paid to plant-based foods. The effects of the dietary intake of different fruits have been investigated so far. This review aims to present the most recent studies concerning the beneficial potential of fruit consumption on human gut microbiota. Investigated plant species are described, and obtained results are presented and discussed in order to provide an overview of both in vitro and in vivo effects of fruits, their juices, and freeze-dried powders.

The impact of Zataria multiflora Boiss extract on in vitro and in vivo Th1/Th2 cytokine (IFN-γ/IL4) balance

2013 ◽  
Vol 150 (3) ◽  
pp. 1024-1031 ◽  
Author(s):  
Mohammad Hossein Boskabady ◽  
Sakine Shahmohammadi Mehrjardi ◽  
Abadorrahim Rezaee ◽  
Houshang Rafatpanah ◽  
Sediqeh Jalali
Keyword(s):  
Zataria Multiflora ◽  
Th2 Cytokine ◽  
Ifn Γ ◽  
The Impact

Pharmacology of 5-HT1A Receptors: Critical Aspects

CNS Spectrums ◽  
1998 ◽  
Vol 3 (10) ◽  
pp. 17-38 ◽  
Author(s):  
Franco Borsini
Keyword(s):  
Receptor Subtypes ◽  
Laboratory Conditions ◽  
In Vivo Effects ◽  
Critical Aspects

AbstractMyriad difficulties exist in analyzing the pharmacology of the serotonin 1A (5-HT1A) receptor. The receptor may demonstrate a different activity depending on the tissue or species used for analysis, the agent used, laboratory conditions, and differences between in vitro and in vivo effects of compounds. Affinity for 5-HT receptors also varies widely, presenting difficulties in drawing definitive conclusions on affinity values for various compounds. At least two possibilities exist to explain the diversity of pharmacology of 5-HT receptors. First, it is possible that different 5-HT1A receptor subtypes exist. Second, the 5-HT1A receptors may play a far more complex role than previously believed.

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