Here, we report the characterization of a set of small, regulatory RNAs (sRNAs) expressed from an Escherichia coli locus we have denoted sdsN located adjacent to the LuxR-homolog gene sdiA Two longer sRNAs, SdsN137 and SdsN178 are transcribed from two σ(S)-dependent promoters but share the same terminator. Low temperature, rich nitrogen sources and the Crl and NarP transcription factors differe...

Reductive metabolism of the aromatic nitro group of 5-nitrofurans is thought to be an important step in the mechanism of their toxicity. Microsomal nitroreductase activity with p-nitrobenzoic acid and N-[4-(5-nitro-2-furyl)-2-thiazolyl[formamide (FANFT) as substrates was assessed in the renal cortex, outer medulla, inner medulla, bladder transitional epithelial and non-epithelial bladder tissue...

The redox chemistry of different nitro compounds of biological significance is focused to understand how the reduction of the nitro group can play an active role in several aspects as: electroanalytical determinations, free radical generation and stability and free radical reactivity. We have focused our studies to a lot of pharmaceuticals belonging mainly to the following families: calcium ant...

Urinary tract infections (UTI) are one of the common chronic and recurrent bacterial infections. Uropathogens which are able to form biofilm constitute a major etiological factor in UTI, especially among elder patients who are subject to long-term catheterization. It is caused by the capacity of the microorganisms for efficient and permanent colonization of tissues and also adhesion to diverse ...

In previous experiments, i.p. injection of the 5 nitronaphthofuran derivative 7-methoxy-2-nitronaphtho[2,1-b]furan (R7000) to lacI transgenic Big Blue mice led to an increase in the mutant frequency (MF), especially in the caecum and the small intestine. In the present work, the in vivo genotoxicity of R7000 in these two target organs was further investigated. Big Blue mice were treated with a ...

The enzymes responsible for the degradation of nitrofuran derivatives in rat small intestinal mucosa were examined in vitro.As a result,it was suggested that the initial reactions in the degradation of 2-(2-furyl)-3-(5-nitro-2-furyl)acrylamide(AF-2) and 5-nitro-2-furfural semicarbazone(nitrofurazone)are mainly catalyzed by xanthine oxidase , while that of 2-amino-5-[2-(5-nitro-2-fury1)-1-(2-fur...

Trichomonas vaginalis (Tv) is a causative agent of worldwide spread sexually transmitted disease, particularly affecting underdeveloped all segments of the population. Metronidazole is by far the most prescribed drug for the treatment of trichomoniasis. However, the appearance of drug resistant has led to the appearance of new drug alternatives. That is why the development of reliable and stand...

Three 5-nitrofuran derivatives showed carcinogenic activity when fed to female Holtzman rats at levels of 0.1 to 0.3% in a commercial diet for up to 44.5 weeks, while 2 other 5-nitrofuran derivatives and 5,5-diphenylhydantoin were inactive. Formic acid 2-[4-(5-nitro-2-furyl)-2-thiazolyl]hydrazide induced benign and malignant tumors of the mammary glands, adenomas or adenocarcinomas of the kidne...

The reductive products of several nitroaromatic compounds have been found to be toxic, mutagenic, and carcinogenic. The nitroreductases present in intestinal microflora have been implicated in the biotransformation of these compounds to their deleterious metabolites. A “classical” nitroreductase has been purified from Enterobacter cloacae 587-fold using a protocol which yields approximately 1 ...