salmonella infections/hypoxia

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Nanophotosensitizer-engineered Salmonella bacteria with hypoxia targeting and photothermal-assisted mutual bioaccumulation for solid tumor therapy.

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Bacteria-driven drug-delivery systems have attracted great attention for their enhanced therapeutic specificity and efficacy in cancer treatment. YB1, a particularly attractive genetically modified safe Salmonella Typhimurium strain, is known to penetrate hypoxic tumor cores with its self-driven

Development of a flexible and potent hypoxia-inducible promoter for tumor-targeted gene expression in attenuated Salmonella.

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To increase the potential of attenuated Salmonella as gene delivery vectors for cancer treatment, we developed a hypoxia-inducible promoter system to limit gene expression specifically to the tumor. This approach is envisaged to not only increase tumor specificity, but also to target those cells

Explicit hypoxia targeting with tumor suppression by creating an "obligate" anaerobic Salmonella Typhimurium strain.

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Using bacteria as therapeutic agents against solid tumors is emerging as an area of great potential in the treatment of cancer. Obligate and facultative anaerobic bacteria have been shown to infiltrate the hypoxic regions of solid tumors, thereby reducing their growth rate or causing regression.

Growth control in the Salmonella-containing vacuole.

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Salmonella enterica is an intracellular bacterial pathogen that inhabits membrane-bound vacuoles of eukaryotic cells. Coined as the 'Salmonella-containing vacuole' (SCV), this compartment has been studied for two decades as a replicative niche. Recent findings reveal, however, marked differences in

Salmonella enterica serovar Enteritidis enterocolitis during late stages of gestation induces an adverse pregnancy outcome in the murine model.

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Foodborne diseases caused by Salmonella enterica serovar Enteritidis (S. Enteritidis) are a significant health problem. Pregnancy, state of immunological tolerance, is a predisposing condition for the development of infections with intracellular pathogens. Salmonella species can cause pregnancy

Effects of prior hypoxia exposure, endotoxin and sleep state on arousal ability to airway obstruction in piglets: implications for sudden infant death syndrome.

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BACKGROUND Respiratory tract infections may be an important component in many deaths attributed to sudden infant death syndrome (SIDS), although the mechanism of involvement remains unclear. OBJECTIVE The hypothesis was tested that prolonged hypoxia and a thermogenic state (simulating a fever due to

Effect of Salmonella endotoxin administered to the pregnant sheep at 133-142 days gestation on fetal oxygenation, maternal and fetal adrenocorticotropic hormone and cortisol, and maternal plasma tumor necrosis factor alpha concentrations.

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We studied the effects of maternal exposure to endotoxin on pregnancy outcome, stimulation of the hypothalamo-hypophyseal-adrenal axes (HHAA) of ewes and their fetuses, and maternal production of tumor necrosis factor alpha (TNF alpha), a central mediator in the pathogenesis of bacterial

Mutagenic activity of nitracrine derivatives in Salmonella typhimurium: relationship to drug physicochemical parameters, and to bacterial uvrB and recA genes and plasmid pKM101.

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To determine whether it is possible to separate antitumour and mutagenic properties in the nitracrine series, a number of 4-substituted derivatives of the hypoxia-selective drug nitracrine have been evaluated for their mutagenic effects at three loci in several strains of Salmonella typhimurium

Salmonella promoters preferentially activated inside tumors.

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Salmonella enterica and avirulent derivatives prefer solid tumors over normal tissue in animal models. The identification of endogenous Salmonella promoters that are preferentially activated in tumors could further our understanding of this phenomenon. Toward this goal, a random library of S.

The effect of the anoxic radiosensitizing agent TAN on induction of revertants by gamma-rays and helium ions in Salmonella tester strains.

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The modification effect of the anoxic radiosensitizer TAN on the mutagenesis in various Salmonella tester strains after gamma-ray and helium ion irradiation was studied. The oxygen enhancement ratios (OER) for all 3 strains on the lethal assay after gamma-irradiation are approximately equal to 2.

Greater hypoxia-induced cell death in prenatal brain after bacterial-endotoxin pretreatment is not because of enhanced cerebral energy depletion: a chicken embryo model of the intrapartum response to hypoxia and infection.

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Infection is a risk factor for adult stroke and neonatal encephalopathy. We investigated whether exposure to bacterial endotoxin increases hypoxia-induced brain cell death and impairs cerebral metabolic compensatory responses to hypoxia. Prehatching chicken embryos (incubation day 19) were exposed

Factors affecting radiation D-values (D₁₀) of an Escherichia coli cocktail and Salmonella Typhimurium LT2 inoculated in fresh produce.

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This study evaluated the effect of produce type, resuspension medium, dose uniformity ratio (DUR), and sample preparation conditions (tissue exposure, MAP, anoxia) on the D₁₀ -value of an Escherichia coli cocktail (BAA-1427, BAA-1428, and BAA-1430) and Salmonella Typhimurium LT2 inoculated on the

Peyer's patches in experimental Salmonella dublin infection in calves. Microvascular and epithelial changes contributing to atrophy of lymphoid follicles.

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Six calves were infected per os with Salmonella dublin and killed nine hours to seven days later. Early changes included occlusion of capillaries with a hyaline material, particularly in the ileal Peyer's patch (PP). Central areas of the follicles contained hemorrhages and edema. In later stages the

Enhanced therapeutic effect by combination of tumor-targeting Salmonella and endostatin in murine melanoma model.

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The growth of tumor is angiogenesis-dependent and it often contains hypoxia and necrotic areas. Salmonella VNP20009 could target and replicate in hypoxia and necrotic areas within tumor and induce antitumor effect. Angiogenesis inhibitor endostatin could reduce tumor angiogenesis and inhibit its

Salmonella-mediated tumor-targeting TRAIL gene therapy significantly suppresses melanoma growth in mouse model.

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Attenuated Salmonella typhimurium (S. typhimurium) strains can selectively grow and express exogenous genes in tumors for targeted therapy. We engineered S. typhimurium strain VNP20009 to secrete tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) under the control of a hypoxia-induced

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