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Antibiotic resistance and efflux pumps

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Abstract

The main purpose of this manuscript is to review the resistance against antibiotics and efflux pumps, one of the mechanisms important in resistance against antibiotics. As a definition, the resistance against antibiotics is accepted as the capability of a microorganism to resist the activity of antimicrobials, which were successfully used to kill the microorganism once. Antibiotic resistance is characterized by several antibiotic susceptibility tests. The wide consumption of antibiotics; the over prescription of antimicrobial drugs by medical doctors; unnecessary, incorrect and inadequate self-medication by the patient and use of several antimicrobial agents either to support a healthy growth or therapeutic purposes in animals consumed as food triggered severe antibiotic resistance. Therefore, the resistance against antimicrobials became a considerable, widespread issue in all around the world and the studies have been initiated to overcome the resistance against antibiotics. There are several different mechanisms, which could lead bacteria to be resistant overtime. One of the mechanism of action, which leads to antibiotic resistance, is efflux pumps. Several efflux pump inhibitors were discovered until now, but since some of them are highly cytotoxic, they have very limited use. Understanding efflux pumps and discovering new inhibitors against these pumps could probably save the future of human beings.
2nd International Eurasian Conference on
Biological and Chemical Sciences
(EurasianBioChem 2019)
28-29 June 2019, Ankara, Turkey
www. EurasianBioChem.org
ORAL PRESENTATION
157
Antibiotic resistance and efflux pumps
Eda Altinöz1*, Ergin Murat Altuner2
*1Kastamonu University, Faculty of Science and Arts, Department of Biology, Kastamonu, Turkey
2Kastamonu University, Faculty of Science and Arts, Department of Biology, Kastamonu, Turkey
*Corresponding author e-mail: altinozedaa@gmail.com
Abstract
The main purpose of this manuscript is to review the resistance against antibiotics and efflux pumps, one of the
mechanisms important in resistance against antibiotics. As a definition, the resistance against antibiotics is accepted
as the capability of a microorganism to resist the activity of antimicrobials, which were successfully used to kill the
microorganism once. Antibiotic resistance is characterized by several antibiotic susceptibility tests. The wide
consumption of antibiotics; the over prescription of antimicrobial drugs by medical doctors; unnecessary, incorrect
and inadequate self-medication by the patient and use of several antimicrobial agents either to support a healthy
growth or therapeutic purposes in animals consumed as food triggered severe antibiotic resistance. Therefore, the
resistance against antimicrobials became a considerable, wide-spread issue in all around the world and the studies
have been initiated to overcome the resistance against antibiotics. There are several different mechanisms, which
could lead bacteria to be resistant overtime. One of the mechanism of action, which leads to antibiotic resistance, is
efflux pumps. Several efflux pump inhibitors were discovered until now, but since some of them are highly
cytotoxic, they have very limited use. Understanding efflux pumps and discovering new inhibitors against these
pumps could probably save the future of human beings.
Keywords: Antibiotic resistance, efflux pumps, inhibitors
Article
Full-text available
Over the years, my colleagues and I have come to realise that the likelihood of pharmaceutical drugs being able to diffuse through whatever unhindered phospholipid bilayer may exist in intact biological membranes in vivo is vanishingly low. This is because (i) most real biomembranes are mostly protein, not lipid, (ii) unlike purely lipid bilayers that can form transient aqueous channels, the high concentrations of proteins serve to stop such activity, (iii) natural evolution long ago selected against transport methods that just let any undesirable products enter a cell, (iv) transporters have now been identified for all kinds of molecules (even water) that were once thought not to require them, (v) many experiments show a massive variation in the uptake of drugs between different cells, tissues, and organisms, that cannot be explained if lipid bilayer transport is significant or if efflux were the only differentiator, and (vi) many experiments that manipulate the expression level of individual transporters as an independent variable demonstrate their role in drug and nutrient uptake (including in cytotoxicity or adverse drug reactions). This makes such transporters valuable both as a means of targeting drugs (not least anti-infectives) to selected cells or tissues and also as drug targets. The same considerations apply to the exploitation of substrate uptake and product efflux transporters in biotechnology. We are also beginning to recognise that transporters are more promiscuous, and antiporter activity is much more widespread, than had been realised, and that such processes are adaptive (i.e., were selected by natural evolution). The purpose of the present review is to summarise the above, and to rehearse and update readers on recent developments. These developments lead us to retain and indeed to strengthen our contention that for transmembrane pharmaceutical drug transport “phospholipid bilayer transport is negligible”.
Article
Foodborne pathogens, such as Salmonella are problematic in food processing environments, and understanding the means of persistence is critical in the development of effective control measures. This study determined the antimicrobial tolerance of Salmonella isolates from the processing environment and characterized their biofilm production and antibiotic resistance. Twenty-five Salmonella isolates were previously recovered from poultry processing equipment in commercial production facilities after sanitation. The minimum inhibitory concentration (MIC) of two antimicrobials; chlorine and quaternary ammonium compounds (QAC) that were frequently used for sanitation was determined for these isolates using the Clinical and Laboratory Standards Institute (CLSI) guidelines. Biofilm forming ability was assessed using the crystal violet assay and antibiotic susceptibility was also determined. These isolates were further characterized based on their genes that were responsible for biofilm formation and resistance to sanitizers and antibiotics. MIC values between 500 and 1000 ppm for chlorine, or 3 to 25 ppm for QAC were observed amongst these Salmonella isolates. These isolates possessed strong (24%), moderate (28%), and weak (48%) biofilm forming ability. All isolates were resistant to multiple antibiotics, and 64% exhibited resistance to aminoglycosides and β-lactams. Molecular characterization showed that the isolates possessed specific genes for biofilm formation, sanitizer tolerance, and antibiotic resistance. These results suggest that Salmonella isolates with low tolerance to sanitizers may remain on surfaces because of their strong biofilm forming ability.
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