[Role of double strand DNA break repair for quinolone sensitivity in Escherichia coli: therapeutic implications]

INTRODUCTION

Quinolones are one of the types of antibiotics with higher resistance rates in the last years. At molecular level, quinolones block type II topoisomerases producing double strand breaks (DSBs). These DSBs could play a double role, as inductors of the quinolone bactericidal effects but also as mediators of the resistance and tolerance mechanisms.

MATERIAL AND METHODS

In this work we have studied the molecular pathways responsible for DSBs repair in the quinolone susceptibility: the stalled replication fork reversal (recombination-dependent) (RFR), the SOS response induction, the translesional DNA synthesis (TLS) and the nucleotide excision repair mechanisms (NER). For this reason, at the European University in Madrid, we analysed the minimal inhibitory concentration (MIC) to three different quinolones in Escherichia coli mutant strains coming from different type culture collections.

RESULTS

recA, recBC, priA and lexA mutants showed a significant reduction on the MIC values for all quinolones tested. No significant changes were observed on mutant strains for TLS and NER.

DISCUSSION

These data indicate that in the presence of quinolones, RFR mechanisms and the SOS response could be involved in the quinolone susceptibility.

[Contents, positioning and quality analysis in Spanish websites related to nutrition and eating behavior disorders]

INTRODUCTION

Eating disorders are serious psychological disorders with an increased incidence in last years. One of the factors that determine the high prevalence of eating disorders in our society is the lack of knowledge about nutrition. One of the reasons of this lack of knowledge could be the presence of online resources without scientific validity. OBJECTIVE AND SCOPE: The aim of this study was to analyze the scientific quality and positioning of websites in Spanish that have information on nutrition, eating disorders and obesity.

MATERIALS AND METHODS

For this purpose, a web search was conducted in the Google Chrome browser using the key words: diet, anorexia, bulimia, obesity and nutrition, and selecting the first 20 results of each search at the rates offered by SeoQuake positioning (Page Rank, Alexa Rank y SEMrush Rank). The variables used for the analysis were: information related to eating habits and diets, information on healthy eating, information about eating disorders and their diagnostics, and formative information about general health topics with professional criteria.

RESULTS

Only the 50% of the webpages accomplished the inclusion criteria for this study. Most of them did not follow the guidelines established by e- Europe assessment for quality. The median of the Webpage's PageRank was 2, except those associated with health institutions.

CONCLUSIONS

Given the scarcity of healthcare websites with scientific rigor is essential to review the existing one and to create new online spaces whose supervision must be carried out by specialists in health and nutrition.