Impact of rising seawater temperature on a phagocytic cell population during infection in the sea anemone .

Climate change is increasing ocean temperatures and consequently impacts marine life (e.g., bacterial communities).

Correction: Interaction of Saccharomyces boulardii with Salmonella enterica Serovar Typhimurium Protects Mice and Modifies T84 Cell Response to the Infection.

[This corrects the article DOI: 10.1371/journal.pone.

An Increase of Seawater Temperature Upregulates the Expression of Virulence Factors Implicated in Adhesion and Biofilm Formation.

Climate change driven seawater temperature (SWT) increases results in greater abundance and geographical expansion of marine pathogens, among which (Vp) causes serious economic and health issues. In addition, plastic pollution in the ocean constitutes a vector for harmful pathogens dissemination. We investigate the effect of elevated SWT on the expression of genes implicated in adhesion and biofilm formation on abiotic surfaces in the clinical Vp strain RIMD2210633, which expresses hemolysins.

Statistics of pathogenic bacteria in the search of host cells.

A crucial phase in the infection process, which remains poorly understood, is the localization of suitable host cells by bacteria. It is often assumed that chemotaxis plays a key role during this phase. Here, we report a quantitative study on how Salmonella Typhimurium search for T84 human colonic epithelial cells.

Escherichia coli Rho GTPase-activating toxin CNF1 mediates NLRP3 inflammasome activation via p21-activated kinases-1/2 during bacteraemia in mice.

Inflammasomes are signalling platforms that are assembled in response to infection or sterile inflammation by cytosolic pattern recognition receptors. The consequent inflammasome-triggered caspase-1 activation is critical for the host defence against pathogens. During infection, NLRP3, which is a pattern recognition receptor that is also known as cryopyrin, triggers the assembly of the inflammasome-activating caspase-1 through the recruitment of ASC and Nek7.

Human Health and Ocean Pollution.

Background: Pollution - unwanted waste released to air, water, and land by human activity - is the largest environmental cause of disease in the world today. It is responsible for an estimated nine million premature deaths per year, enormous economic losses, erosion of human capital, and degradation of ecosystems. Ocean pollution is an important, but insufficiently recognized and inadequately controlled component of global pollution.

Gene expression kinetics of Exaiptasia pallida innate immune response to Vibrio parahaemolyticus infection.

Background: Recent sequencing projects on early-diverging metazoans such as cnidarians, have unveiled a rich innate immunity gene repertoire; however, little is known about immunity gene regulation in the host's early response against marine bacterial pathogens over time. Here, we used RNA-seq on the sea anemone Exaiptasia pallida (Ep) strain CC7 as a model to depict the innate immune response during the onset of infection with the marine pathogenic bacteria Vibrio parahaemolyticus (Vp) clinical strain O3:K6, and lipopolysaccharides (LPS) exposure. Pairwise and time series analyses identified the genes responsive to infection as well as the kinetics of innate immune genes over time.

Modulation of 5-fluorouracil activation of toll-like/MyD88/NF-κB/MAPK pathway by Saccharomyces boulardii CNCM I-745 probiotic.

Background And Aim: Chemotherapy drugs that act via Toll-like receptors (TLRs) can exacerbate mucosal injury through the production of cytokines. Intestinal mucositis can activate TLR2 and TLR4, resulting in the activation of NF-κB. Intestinal mucositis characterized by intense inflammation is the main side effect associated with 5-fluorouracil (5-FU) treatment.

Diversity of CNCM I-745 mechanisms of action against intestinal infections.

The yeast CNCM I-745 is one of the probiotics recommended for the prevention of antibiotic-associated diarrhea. Studies conducted and demonstrated that in the case of infectious diseases there are two potential sites of action of CNCM I-745: (1) An action on enteropathogenic microorganisms (adhesion of bacteria and their elimination or an effect on their virulence factors: Toxins, lipopolysaccharide, .); and (2) a direct action on the intestinal mucosa (trophic effects, effects on epithelial reconstitution, anti-secretory effects, anti-inflammatory, immunomodulators).

Strain CNCM I-745 Modifies the Mononuclear Phagocytes Response in the Small Intestine of Mice Following Typhimurium Infection.

Intestinal mononuclear phagocytes (MPs) comprise dendritic cells (DCs) and macrophages (Mφs) that play different roles in response to infection. After phagocytosis, DCs expressing CD103 transport from the intestinal tract to the mesenteric lymph nodes (MLN) and induce adaptive immune responses whereas resident Mφs expressing CX3CR1 capture bacteria in the lumen and reside in the (LP) where they induce a local immune response. CX3CR1 Mφs are generated from Ly6C monocytes that enter the colonic mucosa and differentiate locally.

The Saccharomyces boulardii CNCM I-745 strain shows protective effects against the B. anthracis LT toxin.

The probiotic yeast Saccharomyces boulardii (S. boulardii) has been prescribed for the prophylaxis and treatment of several infectious diarrheal diseases. Gastrointestinal anthrax causes fatal systemic disease.

Saccharomyces boulardii modifies Salmonella typhimurium traffic and host immune responses along the intestinal tract.

Salmonella enterica serovar Typhimurium (ST) is an enteropathogenic Gram-negative bacterium that causes infection following oral ingestion. ST spreads rapidly along the gastrointestinal tract (GIT) and invades the intestinal epithelium to ultimately reach internal body organs. The probiotic yeast Saccharomyces boulardii BIOCODEX (S.

The anti-mitotic drug griseofulvin induces apoptosis of human germ cell tumor cells through a connexin 43-dependent molecular mechanism.

Griseofulvin, a widely used antifungal antimitotic drug has been proposed as an anti-tumoral treatment by way of in vitro experiments. Recently, in vivo demonstration of griseofulvin efficacy against multiple myeloma in mice argues for its potential as therapeutics for cancer. Nevertheless, the molecular mechanisms by which griseofulvin disrupts cancerous cell progression are far from being understood.

Saccharomyces boulardii improves intestinal epithelial cell restitution by inhibiting αvβ5 integrin activation state.

Intestinal epithelial cell damage is frequently seen in the mucosal lesions of infectious or inflammatory bowel diseases such as ulcerative colitis or Crohn's disease. Complete remission of these diseases requires both the disappearance of inflammation and the repair of damaged epithelium. Saccharomyces boulardii (Sb, Biocodex) is a non-pathogenic yeast widely used as a preventive and therapeutic probiotic for the prevention and treatment of diarrhea and other gastrointestinal disorders.

Modification of Salmonella Typhimurium motility by the probiotic yeast strain Saccharomyces boulardii.

Background: Motility is an important component of Salmonella enterica serovar Typhimurium (ST) pathogenesis allowing the bacteria to move into appropriate niches, across the mucus layer and invade the intestinal epithelium. In vitro, flagellum-associated motility is closely related to the invasive properties of ST. The probiotic yeast Saccharomyces boulardii BIOCODEX (S.

Calpain 2-dependent IκBα degradation mediates CPT-11 secondary resistance in colorectal cancer xenografts.

CPT-11 (irinotecan), the first-line chemotherapy for advanced stage colorectal cancer, remains inactive in about half of patients (primary chemoresistance) and almost all initial responders develop secondary resistance after several courses of treatment (8 months on average). Nude mice bearing HT-29 colon cancer xenografts were treated with CPT-11 and/or an NF-κB inhibitor for two courses. We confirm that NF-κB inhibition potentiated CPT-11 anti-tumoural effect after the first course of treatment.

Saccharomyces boulardii improves intestinal cell restitution through activation of the α2β1 integrin collagen receptor.

Intestinal epithelial cell damage is frequently seen in the mucosal lesions of inflammatory bowel diseases such as ulcerative colitis or Crohn's disease. Complete remission of these diseases requires both the cessation of inflammation and the migration of enterocytes to repair the damaged epithelium. Lyophilized Saccharomyces boulardii (Sb, Biocodex) is a nonpathogenic yeast widely used as a therapeutic agent for the treatment and prevention of diarrhea and other gastrointestinal disorders.

Interaction of Saccharomyces boulardii with Salmonella enterica serovar Typhimurium protects mice and modifies T84 cell response to the infection.

Background: Salmonella pathogenesis engages host cells in two-way biochemical interactions: phagocytosis of bacteria by recruitment of cellular small GTP-binding proteins induced by the bacteria, and by triggering a pro-inflammatory response through activation of MAPKs and nuclear translocation of NF-kappaB. Worldwide interest in the use of functional foods containing probiotic bacteria for health promotion and disease prevention has increased significantly. Saccharomyces boulardii is a non-pathogenic yeast used as a probiotic in infectious diarrhea.

Mast cells and cellularity of the colonic mucosa correlated with fatigue and depression in irritable bowel syndrome.

Background: A subset of patients with irritable bowel syndrome (IBS) have an increased number of mast cells (MCs) in the colonic mucosa. Psychological factors are believed to contribute to the course of IBS.

Aims: To examine associations between fatigue, depression and MCs of the colonic mucosa in IBS.

Pharmacological targeting of NF-kappaB potentiates the effect of the topoisomerase inhibitor CPT-11 on colon cancer cells.

NF-kappaB interferes with the effect of most anti-cancer drugs through induction of anti-apoptotic genes. Targeting NF-kappaB is therefore expected to potentiate conventional treatments in adjuvant strategies. Here we used a pharmacological inhibitor of the IKK2 kinase (AS602868) to block NF-kappaB activation.

Review article: yeast as probiotics -- Saccharomyces boulardii.

Background: Probiotics are defined as live micro-organisms which confer a health benefit on the host. Although most probiotics are bacteria, one strain of yeast, Saccharomyces boulardii, has been found to be an effective probiotic in double-blind clinical studies.

Aims: To compare the main properties that differentiates yeast from bacteria and to review the properties of S.

Saccharomyces boulardii inhibits inflammatory bowel disease by trapping T cells in mesenteric lymph nodes.

Background & Aims: Saccharomyces boulardii is a nonpathogenic yeast used for treatment of diarrhea. We used a mice model of inflammatory bowel disease (IBD) to analyze the effects of S boulardii on inflammation.

Methods: Lymphocyte-transferred SCID mice, displaying IBD, were fed daily with S boulardii.

Saccharomyces boulardii prevents TNF-alpha-induced apoptosis in EHEC-infected T84 cells.

Induction of apoptosis and necrosis by enterohemorrhagic Escherichia coli (EHEC) has been reported in vivo and in vitro, but features of cell death were not noted in those reports. Since tumor necrosis factor-alpha (TNF-alpha) has been implicated in the apoptosis of invasive bacteria, we investigated the role of this cytokine in EHEC-induced apoptosis. We hypothesize that the probiotic yeast strain Saccharomyces boulardii that interferes with EHEC-induced pro-inflammatory pathways delays EHEC-induced apoptosis.

Saccharomyces boulardii interferes with enterohemorrhagic Escherichia coli-induced signaling pathways in T84 cells.

Enterohemorrhagic Escherichia coli (EHEC) infections are associated with the modification of tight-junction permeability and synthesis of proinflammatory cytokine interleukin-8 (IL-8). In a previous study, it was demonstrated that EHEC-induced IL-8 secretion is due to the involvement of the mitogen-activated protein kinase (MAPK), AP-1, and NF-kappaB pathways. In this study, we investigated the effect of the yeast Saccharomyces boulardii on EHEC infection in T84 cells.