Helicobacter pylori induces cell death by apoptosis. However, the apoptosis-inducing factor is still unknown. The virulence factor vacuolating cytotoxin A (VacA) is a potential candidate, and thus its role in apoptosis induction was investigated in the human gastric epithelial cell line AGS. The supernatant from the vacA wild-type strain P12 was able to induce apoptotic cell death, whereas the ...

PURPOSE The aim of this study is to investigate the effect of genetic variations and the expression of the reduced folate carrier (RFC) and dihydrofolate reductase (DHFR) on the drug sensitivity to methotrexate (MTX) in different cancer cell lines. MATERIALS AND METHODS We examined the six human cancer cell lines (MCF-7, AGS, A549, NCI-H23, HCT-116 and Saos-2). The cytotoxicity of MTX was mea...

Helicobacter pylori (H. pylori) is a bacterium that naturally thrives in acidic environments and has the potential to induce various gastrointestinal disorders humans. The antibiotic therapy utilized for treating H. can lead undesired side effects, such as dysbiosis gut microbiota. objective of our study was explore antibacterial effects nisin lactic acid (LA) yogurt against pylori. Additionall...

AbstractFerulago angulata Boiss. known in Iran as Chavir, has some bioactive compounds having antioxidant activity. Because of its antioxidant activities, it sounded Chavir extract can be a good candidate for finding chemopreventive agents having inductive apoptosis properties on cancer cells. In this study, the cytotoxic effects and proapoptotic activities of Chavir’s leaf and flower extracts ...

Background: OCT4B1, a variant of OCT4, is expressed in both cancer cells and tissues. This variant has a main role in the regulation of both apoptotic and stress (heat-shock proteins) pathways. The aim of this study was to investigate the effects of OCT4B1 silencing on the expression of small heat-shock proteins (sHSPs)in three human tumor cell lines. Methods:...

We have previously found that monkey V 2V 2 T cells mount adaptive immune responses in response to Mycobacterium bovis bacillus Calmette-Guérin infections. We have now analyzed rhesus monkey T cell responses to nonpeptide Ags and superantigens. Like human V 2V 2 T cells, rhesus monkey T cells are stimulated when exposed to prenyl pyrophosphate, bisphosphonate, and alkylamine Ags. Responsiveness...

Dendritic cells (DCs) use cellular pathways collectively referred to as cross-presentation to stimulate CD8 + T cells with peptide Ags derived from internalized, exogenous Ags. We have recently reported that DCs rely on aminoterminal trimming of cross-presented peptides by insulin-responsive aminopeptidase (IRAP), an enzyme localized in a regulated endosomal storage compartment. Considering a r...

Hyperproliferation and oncogene expression are observed in the mucosa of Helicobacter pylori- (H. pylori-) infected patients with gastritis or adenocarcinoma. Expression of oncogenes such as β-catenin and c-myc is related to oxidative stress. α-Lipoic acid (α-LA), a naturally occurring thiol compound, acts as an antioxidant and has an anticancer effect. The aim of this study is to investigate t...

The DNA methyltransferase inhibitor decitabine, 5-Aza-2'-deoxycytidine, possesses anti-metabolic and anticancer activities in various cancer cells. However, the biochemical mechanisms underlying decitabine-induced inhibition of invasiveness and metastasis have not been thoroughly studied. In this study, we investigated the effect of decitabine on ...

TCRs possess considerable cross-reactivity toward structurally related Ags. Because the signaling threshold for negative selection is lower than that required for activation of mature T cells, the question arises as to which extent thymic deletion of self-specific T cells affects T cell responsiveness toward foreign peptides. In this study we show, in three different mouse models systems, that ...