Search results for " Pathogenesis"

Urticaria and bacterial infections

2014

The association between urticaria and infectious diseases has been discussed for >100 years. However, a causal relationship with underlying or precipitating infection is difficult to establish. The purpose of this work was to perform a systematic analysis of the published cases of urticaria associated with bacterial infections. We give an umbrella breakdown of up-to-date systematic reviews and other important publications on the complex association of urticaria and bacterial infections. We did a Medline search, for English language articles published until January 2014, using the key words "urticaria" and "bacteria/bacterial disease"; a second analysis was performed in groups of bacteria an…

New active drugs against liver stages of Plasmodium predicted by molecular topology.

2008

ABSTRACT We conducted a quantitative structure-activity relationship (QSAR) study based on a database of 127 compounds previously tested against the liver stage of Plasmodium yoelii in order to develop a model capable of predicting the in vitro antimalarial activities of new compounds. Topological indices were used as structural descriptors, and their relation to antimalarial activity was determined by using linear discriminant analysis. A topological model consisting of two discriminant functions was created. The first function discriminated between active and inactive compounds, and the second identified the most active among the active compounds. The model was then applied sequentially t…

Functional regulation of HIF-1α under normoxia--is there more than post-translational regulation?

2011

The hypoxia-inducible factor-1 (HIF-1) is an oxygen-regulated transcriptional activator playing a pivotal role in mammalian physiology and disease pathogenesis, e.g., HIF-1 is indispensable in a broad range of developmental stages in different tumors. Its post-translational regulation via PHDs under the influence of hypoxia is widely investigated and accepted. Different non-hypoxic stimuli such as lipopolysaccharides (LPS), thrombin, and angiotensin II (Ang II), have been proven to enhance HIF-1 levels through activation of regulative mechanisms distinct from protein stabilization. Some of these stimuli specifically regulate HIF-1α at the transcriptional, post-transcriptional, or translatio…

Role of tir and intimin in the virulence of rabbit enteropathogenic Escherichia coli serotype O103:H2.

2000

ABSTRACT Attaching and effacing (A/E) rabbit enteropathogenic Escherichia coli (REPEC) strains belonging to serogroup O103 are an important cause of diarrhea in weaned rabbits. Like human EPEC strains, they possess the locus of enterocyte effacement clustering the genes involved in the formation of the A/E lesions. In addition, pathogenic REPEC O103 strains produce an Esp-dependent but Eae (intimin)-independent alteration of the host cell cytoskeleton characterized by the formation of focal adhesion complexes and the reorganization of the actin cytoskeleton into bundles of stress fibers. To investigate the role of intimin and its translocated coreceptor (Tir) in the pathogenicity of REPEC, …

The Streptococcal Exotoxin Streptolysin O Activates Mast Cells To Produce Tumor Necrosis Factor Alpha by p38 Mitogen-Activated Protein Kinase- and Pr…

2003

ABSTRACTStreptolysin O (SLO), a major virulence factor of pyogenic streptococci, binds to cholesterol in the membranes of eukaryotic cells and oligomerizes to form large transmembrane pores. While high toxin doses are rapidly cytocidal, low doses are tolerated because a limited number of lesions can be resealed. Here, we report that at sublethal doses, SLO activates primary murine bone marrow-derived mast cells to degranulate and to rapidly induce or enhance the production of several cytokine mRNAs, including tumor necrosis factor alpha (TNF-α). Mast cell-derived TNF-α plays an important protective role in murine models of acute inflammation, and the production of this cytokine was analyzed…

Replication of hepatitis C virus

2000

The evolution of collective infectious units in viruses

2019

Viruses frequently spread among cells or hosts in groups, with multiple viral genomes inside the same infectious unit. These collective infectious units can consist of multiple viral genomes inside the same virion, or multiple virions inside a larger structure such as a vesicle. Collective infectious units deliver multiple viral genomes to the same cell simultaneously, which can have important implications for viral pathogenesis, antiviral resistance, and social evolution. However, little is known about why some viruses transmit in collective infectious units, whereas others do not. We used a simple evolutionary approach to model the potential costs and benefits of transmitting in a collect…

Acute Postcataract Surgery Endophthalmitis Due to Streptococcus Species Differs From Endophthalmitis Due to Staphylococcus Species at Presentation

2009

Purpose: : To correlate the presenting clinical ophthalmic features with the bacterial identification in 100 patients with acute post catarcat endophthalmitis enrolled in the FRench Instutionnal ENdophthalmitis Study (FRIENDS).Methods: : Demographic data, past medical history and initial eye examination were recorded in a standardized form in 100 patients with acute endophthalmitis after cataract extraction (< 6 weeks) in a prospective multicenter study. Relationship between microbiological identification (using conventional cultures and panbacterial PCR) and clinical factors at baseline was studied using univariate (ANOVA).Results: : 100 patients were hospitalized for endophthalmitis treat…

Mitochondria and T2D: Role of Autophagy, ER Stress, and Inflammasome.

2020

Type 2 diabetes (T2D) is one of the main current threats to human health. Both T2D and its numerous clinical complications are related to mitochondrial dysfunction and oxidative stress. Over the past decade, great progress has been made in extending our knowledge about the signaling events regulated by mitochondria. However, the links among mitochondrial impairment, oxidative stress, autophagy, endoplasmic reticulum (ER) stress, and activation of the inflammasome still need to be clarified. In light of this deficit, we aim to provide a review of the existing literature concerning the complicated crosstalk between mitochondrial impairment, autophagy, ER stress, and the inflammasome in the mo…

Animal models: Murine cytomegalovirus

2002

Publisher Summary This chapter focuses on murine cytomegalovirus (CMV) animal models. Multiple-organ cytomegalovirus disease, interstitial pneumonia in particular, is a major concern in the therapy of hematopoietic malignancies by hematoablative treatment and bone marrow transplantation (BMT). Human CMV (hCMV) is the prototype member of the subfamily, Betaherpesvirinae, of the virus family, Herpesviridae . Its genome is a linear, double-stranded DNA with a coding capacity of ca. 165 open reading frames. During an aeon of co-evolution, CMVs have adapted themselves to their respective hosts; therefore, CMV biology is most reliably studied in a natural virus-host combination. Even though hCMV …