background and objectives: staphylococcus aureus is an important agent in hospital and community-associated infections, causing high morbidity and mortality. introduction of the new antimicrobial classes for this pathogen has been usually followed by the emergence of resistant strains through multiple mechanisms. for instance, resistance to clindamycin (cli) can be constitutive or inducible. in...

Escherichia coli MG1655 acid-inducible genes were identified by whole-genome expression profiling. Cultures were grown to the mid-logarithmic phase on acidified glucose minimal medium, conditions that induce glutamate-dependent acid resistance (AR), while the other AR systems are either repressed or not induced. A total of 28 genes were induced in at least two of three experiments in which the ...

Cancer-associated fibroblasts induce malignant behavior in genetically initiated but nontumorigenic human prostatic epithelium. The genetic basis for such transformation is still unknown. By using Affymetrix GeneChip technology, we profiled genomewide gene expression of transformed [tumorigenic benign prostatic hyperplasia (BPH1)(CAFTD)] and parental (nontumorigenic BPH1) cells. We identified d...

Predation is a major selective force structuring biological communities and causing the evolution of defenses in many prey organisms. While permanent defenses evolve under constant predation pressure, inducible defenses are adaptations to heterogeneity in predation risk [1] and likely evolved under divergent selection regimes. Costs for the production or maintenance of defenses are saved during...

An isopropyl beta-D-thiogalactopyranoside (IPTG)-inducible episomal expression system has been established for the human breast carcinoma cell line MCF7. This two-component system includes: (i) a primate cell-specific episomal vector, pEpiLac, that contains an IPTG-inducible promoter and (ii) a cell line derived from MCF7, MCF7/LAP5, which expresses the IPTG-dependent transactivator LAP267. Tre...

Hybrid genes containing the 5' region of Drosophila heat shock protein (hsp) genes, ligated to the herpesvirus thymidine kinase (tk) gene, were transfected into Drosophila line S3 cells. Constructions containing sequences upstream from hsp70, or from any of the small hsp genes, showed heat-inducible tk expression. Ecdysterone-inducible tk expression was seen only in transfections with small hsp...

macrophages accumulate in poorly vascularised and hypoxic sites including solid tumours, wounds and sites of infection and inflammation where they can be exposed to low levels of oxygen for long periods. up to date, different studies have shown that a number of transcription factors are activated by hypoxia which in turn activate a broad array of mitogenic, pro-invasive, pro-angiogenic, and pro...

Background: Natural antisense transcripts (asRNAs) are transcribed from many genes in various species. Recently, we found that asRNAs were transcribed from the rat and mouse genes encoding inducible nitric oxide synthase (iNOS), which catalyzes the production of the essential inflammatory mediator nitric oxide. The iNOS asRNA corresponds to the 3’-untranslated region (3’UTR) of the iNOS mRNA. W...