scholarly journals Aminocarboxylic acids related to aspergillomarasmine A (AMA) and ethylenediamine-N,N′-disuccinic acid (EDDS) are strong zinc-binders and inhibitors of the metallo-beta-lactamase NDM-1

2020 ◽  
Vol 56 (20) ◽  
pp. 3047-3049 ◽  
Author(s):  
Kamaleddin H. M. E. Tehrani ◽  
Haigen Fu ◽  
Nora C. Brüchle ◽  
Vida Mashayekhi ◽  
Alejandro Prats Luján ◽  
...  
Keyword(s):  
Bacterial Resistance ◽  
Beta Lactamase ◽  
Aminocarboxylic Acid ◽  
Potent Inhibition

Aminocarboxylic acid analogues of aspergillomarasmine A (AMA) and ethylenediamine-N,N′-disuccinic acid (EDDS) were prepared via a robust chemoenzymatic approach. These compounds display potent inhibition of the bacterial resistance enzyme NDM-1.

scholarly journals On the origin of bacterial resistance to penicillin: comparison of a beta-lactamase and a penicillin target

Science ◽  
1986 ◽  
Vol 231 (4744) ◽  
pp. 1429-1431 ◽  
Author(s):  
J. Kelly ◽  
O Dideberg ◽  
P Charlier ◽  
J. Wery ◽  
M Libert ◽  
...  
Keyword(s):  
Bacterial Resistance ◽  
Beta Lactamase ◽  
Resistance To Penicillin

scholarly journals Antibiotic resistance in uropathogenic enterobacteria

2021 ◽  
Vol 319 ◽  
pp. 01102
Author(s):  
Jamila Hamamouchi ◽  
Aicha Qasmaoui ◽  
Karima Halout ◽  
Réda Charof ◽  
Farida Ohmani
Keyword(s):  
Antibiotic Resistance ◽  
Bacterial Resistance ◽  
Multidrug Resistant ◽  
Beta Lactamase ◽  
Mechanisms Of Resistance ◽  
Beta Lactamases ◽  
Extended Spectrum Beta Lactamase ◽  
Public Health Threat ◽  
Amoxicillin Clavulanic Acid ◽  
Epidemic Diseases

Multidrug-resistant Enterobacteriaceae are a major public health threat worldwide. These germs are the most redoubtable because they are producers of beta-lactamases and possess other mechanisms of resistance to many antibiotics. The objective of this work is to identify isolated strains of Enterobacteriaceae and to study their antibiotic resistance profiles, thus contributing to the surveillance of antibioresistance. This is a retrospective study over a period of three years (2018-2020) including urine samples taken in the region of Rabat-Salé-Zaire and examined at the laboratory of Epidemic Diseases in National Institute of Hygiene of Rabat. Enterobacteriaceae were the most frequent germs with a predominance of Escherichia coli (68%) followed by Klebsiella pneumoniae (23%). Extended-spectrum beta-lactamase-producing Enterobacteriaceae accounted for 10.5%. The highest resistance was observed with amoxicillin, followed by ticarcillin, cefalotin, trimethoprim/sulfamethoxazole, amoxicillin+clavulanic acid, nalidixic acid and finally ciprofloxacin and norfloxacin. The aminoglycosides and the 2nd and 3rd cephalosporins were the most active molecules. The sensitivity of imipenem and ertapenem was 100%. This study shows the worrying appearance of resistance to the usual antibiotics in uropathogenic enterobacteria. Rational prescription of antibiotics and monitoring of the evolution of bacterial resistance are necessary in each region.

scholarly journals beta-Lactamases in laboratory and clinical resistance.

1995 ◽  
Vol 8 (4) ◽  
pp. 557-584 ◽  
Author(s):  
D M Livermore
Keyword(s):  
Bacterial Resistance ◽  
Beta Lactamase ◽  
Beta Lactam ◽  
Beta Lactams ◽  
Producer Strain ◽  
Phenotypic Properties ◽  
Beta Lactamases ◽  
Beta Lactam Antibiotics ◽  
Clinical Resistance ◽  
Gram Negative Organisms

beta-Lactamases are the commonest single cause of bacterial resistance to beta-lactam antibiotics. Numerous chromosomal and plasmid-mediated types are known and may be classified by their sequences or phenotypic properties. The ability of a beta-lactamase to cause resistance varies with its activity, quantity, and cellular location and, for gram-negative organisms, the permeability of the producer strain. beta-Lactamases sometimes cause obvious resistance to substrate drugs in routine tests; often, however, these enzymes reduce susceptibility without causing resistance at current, pharmacologically chosen breakpoints. This review considers the ability of the prevalent beta-lactamases to cause resistance to widely used beta-lactams, whether resistance is accurately reflected in routine tests, and the extent to which the antibiogram for an organism can be used to predict the type of beta-lactamase that it produces.

Inhibitory Effect of Herbs on Extended Spectrum Beta Lactamase Enzyme from Escherichia coli of Healthy Broilers

2020 ◽  
Author(s):  
Arpita Shrivastav ◽  
R.K. Sharma ◽  
Neeraj Shrivastav ◽  
Vidhi Gautam ◽  
S.K. Jain
Keyword(s):  
Escherichia Coli ◽  
Bacterial Resistance ◽  
Colorimetric Method ◽  
Punica Granatum ◽  
Inhibitory Effect ◽  
Syzygium Aromaticum ◽  
Beta Lactamase ◽  
Extended Spectrum Beta Lactamase ◽  
Extended Spectrum ◽  
Multiplex Pcr Assay

Background: Bacterial resistance to beta-lactam antibiotics has risen dramatically in Escherichia coli from poultry and other food animals due to the production of extended-spectrum beta-lactamase enzyme (ESBLs) which degrades third generation cephalosporins.Herbs could be a better alternative for such cases. Methods: Present study was undertaken on 400 caecal samples of healthy broilers, collected from various poultry sale outlets of Jabalpur (M.P.). Samples were screened phenotypically and genotypically for the presence of extended spectrum beta lactamase producing E. coli. Inhibitory effect of fruit peel juice of Punica granatum and Syzigium aromaticum oil observed on the Beta lactamase enzyme obtained from these positive samples by colorimetric method using CENTA and NITROCEFIN as chromogenic substrate.Result: Phenotypically 135 samples/isolates were ESBL producing E.coli. On multiplex PCR assay 76 positive samples with bla TEM, blaCTX and bla SHV, gene was obtained. Oil of Syzygium aromaticum showed maximium per cent inhibition, Punica granatum depicted lower per cent inhibition with CENTA and NITROCEFIN respectively. Combination of both herbs showed increased inhibition. Tazobactum, (100µM) taken as the standard control exhibited 99.88 and 98 per cent inhibition of ESBL enzyme.

scholarly journals Antimicrobial Resistance and Extended-Spectrum Beta-Lactamase Production in Enterobacteriaceae Isolates from Household Cats (Felis silvestris catus)

2019 ◽  
Vol 47 (1) ◽  
Author(s):  
Ana Claudia Souza Andrade ◽  
Isabela Carvalho Dos Santos ◽  
Lidiane Nunes Barbosa ◽  
Isabel Cristina da Silva Caetano ◽  
Melissa Marchi Zaniolo ◽  
...  
Keyword(s):  
Antimicrobial Resistance ◽  
Oral Cavity ◽  
Animal Species ◽  
Bacterial Resistance ◽  
Beta Lactamase ◽  
Esbl Producer ◽  
Extended Spectrum Beta Lactamase ◽  
Anal Orifice ◽  
Extended Spectrum ◽  
Producer Strains

Background: In Brazil, cats in households has recently increased dramatically, likely due to their lower space and care requirements. We need to know the health of these companion animal species, since they have behavioral patterns that make them an important link in the epidemiological chain. Extended spectrum beta-lactamase producer strains (ESBL) are resistant to penicillin, cephalosporin and monobactam, but they are susceptible to clavulanate. The goal of this study is to detect strains of Enterobacteriaceae that produce extended spectrum beta-lactamase (ESBL) and evaluate the bacterial resistance profile in isolated cats (Felis silvestris catus) that live in a city located at west of Parana state, Brazil.Materials, Methods & Results: Swabs were aseptically collected from the anal orifice and oral cavity of 49 female domestic cats that were healthy upon clinical and physical examination, a minimum age of one year, weighing up to 3 kg, and had attended a veterinary clinic specializing in cats, in order to, later, perform the isolation and bacterial identification, antimicrobial sensibility phenotypic test and the phenotypic test to detect ESBL producer strains. From the 98 swabs collected it was possible to perform the bacterial isolation in 68 samples; 40.81% isolated from anal orifice and 28.57% isolated from oral cavity. From rectal and oral cavities 77.50% and 71.42% of the isolated were identified as Escherichia coli respectively, being 2.94% considered ESBL producer strains. In relation to bacterial resistance the antibiotics that shown more resistance in anal orifice were ampicillin, amoxicillin, nalidixic acid, sulfazotrim, tetracycline and aztreonam. In oral cavity they were ampicillin, amoxicillin, cefoxitin, amoxicillin + clavulanate, aztreonam, ceftriaxone and nalidixic acid; and the bacterial resistance index shown that 39.70% were considered high level risk.Discussion: Household cats have a very important role in society, since the benefits they provide to their owners are clear, however, it is worth pointing out that these animals also pose risks to human health, caused by the transmission of zoonoses and also the possibility of transfer of antimicrobial resistance genes between bacteria of animal and human origin, as well as between bacteria of the normal microbiota and pathogenic microorganisms of diferents origins. Therefore, it is important to understand the health of these companion animal species, because they exhibit behavioral patterns that make them an important link in the epidemiological chain of potentially infectious microorganisms, which may show antimicrobial resistance. Extended spectrum beta-lactamase producer strains (ESBL) are resistant to penicillin, cephalosporin and monobactam, but they are susceptible to clavulanate. These enzymes hydrolyze the beta-lactam ring of the antibiotic structure, inactivating them. Nowadays bacterial resistance is considered to be one of the greatest problems in public health worldwide, as infections and diseases outbraks are caused by multiresistant bacteria are more and more frequent. The results of this study demonstrate the presence of strains of Enterobacteriaceae family associated to the high bacterial resistance, with samples that indicate ESBL producer strains in domiciled cats, in a city of west Parana state in Brazil. These results confirm that these cats can be considered as reservoirs of different microbial agents and resistance gens, being a health problem by the possibility of dissemination. The cat population is multiplying in a higher proportion compared to dogs and may probably became predominant in less than one decade. Due this situation and thinking about human, animal and environmental health new phenotypic studies to confirm the resistance gens and ESBL producers should be conducted in this specie.

scholarly journals Spectrum of Beta-Lactamase Inhibition by the Cyclic Boronate QPX7728, an Ultrabroad-Spectrum Beta-Lactamase Inhibitor of Serine and Metallo-Beta-Lactamases: Enhancement of Activity of Multiple Antibiotics against Isogenic Strains Expressing Single Beta-Lactamases

2020 ◽  
Vol 64 (6) ◽  
Author(s):  
Olga Lomovskaya ◽  
Ruslan Tsivkovski ◽  
Kirk Nelson ◽  
Debora Rubio-Aparicio ◽  
Dongxu Sun ◽  
...  
Keyword(s):  
Beta Lactamase ◽  
Content Type ◽  
Beta Lactamases ◽  
Biochemical Assays ◽  
Potent Inhibition ◽  
Class B ◽  
Extended Spectrum Beta Lactamases ◽  
Orally Bioavailable ◽  
Lactamase Inhibitor ◽  
Multiple Antibiotics

ABSTRACT QPX7728 is an ultrabroad-spectrum boronic acid beta-lactamase inhibitor, with potent inhibition of key serine and metallo-beta-lactamases being observed in biochemical assays. Microbiological studies using characterized strains were used to provide a comprehensive characterization of the spectrum of beta-lactamase inhibition by QPX7728. The MICs of multiple antibiotics administered intravenously only (ceftazidime, piperacillin, cefepime, ceftolozane, and meropenem) and orally bioavailable antibiotics (ceftibuten, cefpodoxime, tebipenem) alone and in combination with QPX7728 (4 μg/ml), as well as comparator agents, were determined against panels of laboratory strains of Pseudomonas aeruginosa and Klebsiella pneumoniae expressing over 55 diverse serine and metallo-beta-lactamases. QPX7728 significantly enhanced the potency of antibiotics against strains expressing class A extended-spectrum beta-lactamases (CTX-M, SHV, TEM, VEB, PER) and carbapenemases (KPC, SME, NMC-A, BKC-1), consistent with the beta-lactamase inhibition demonstrated in biochemical assays. It also inhibited both plasmidic (CMY, FOX, MIR, DHA) and chromosomally encoded (P99, PDC, ADC) class C beta-lactamases and class D enzymes, including carbapenemases, such as OXA-48 from Enterobacteriaceae and OXA enzymes from Acinetobacter baumannii (OXA-23/24/72/58). QPX7728 is also a potent inhibitor of many class B metallo-beta-lactamases (NDM, VIM, CcrA, IMP, and GIM but not SPM or L1). Addition of QPX7728 (4 μg/ml) reduced the MICs for a majority of the strains to the level observed for the control with the vector alone, indicative of complete beta-lactamase inhibition. The ultrabroad-spectrum beta-lactamase inhibition profile makes QPX7728 a viable candidate for further development.

scholarly journals CuO Bionanocomposite with Enhanced Stability and Antibacterial Activity against Extended-Spectrum Beta-Lactamase Strains

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6336
Author(s):  
Hina Qamar ◽  
Adil Saeed ◽  
Mohammad Owais ◽  
Touseef Hussain ◽  
Kashif Hussain ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Zeta Potential ◽  
Bacterial Resistance ◽  
Synthesis Method ◽  
Egg Yolk ◽  
Public Health Care ◽  
Beta Lactamase ◽  
One Pot ◽  
Extended Spectrum Beta Lactamase ◽  
Extended Spectrum

Worldwide, bacterial resistance to beta-lactam antibiotics is the greatest challenge in public health care. To overcome the issue, metal-based nanoparticles were extensively used as an alternative to traditional antibiotics. However, their unstable nature limits their use. In the present study a very simple, environmentally friendly, one-pot synthesis method that avoids the use of organic solvents has been proposed to design stable, novel nanocomposites. Formulation was done by mixing biogenic copper oxide (CuO) nanomaterial with glycerol and phospholipids isolated from egg yolk in an appropriate ratio at optimum conditions. Characterization was done using dynamic light scattering DLS, Zeta potential, high performance liquid chromatography (HPLC), and transmission electron microscopy (TEM). Further, its antibacterial activity was evaluated against the extended-spectrum beta-lactamase strains based on zone of inhibition and minimal inhibitory concentration (MIC) indices. Results from this study have demonstrated the formulation of stable nanocomposites with a zeta potential of 34.9 mV. TEM results indicated clear dispersed particles with an average of 59.3 ± 5 nm size. Furthermore, HPLC analysis of the egg yolk extract exhibits the presence of phospholipids in the sample and has significance in terms of stability. The newly formed nanocomposite has momentous antibacterial activity with MIC 62.5 μg/mL. The results suggest that it could be a good candidate for drug delivery in terms of bactericidal therapeutic applications.

scholarly journals Increasing Bacterial Resistance in Pediatric Acute Conjunctivitis (1997–1998)

2000 ◽  
Vol 44 (6) ◽  
pp. 1650-1654 ◽  
Author(s):  
Stan L. Block ◽  
James Hedrick ◽  
Ron Tyler ◽  
Alan Smith ◽  
Rebecca Findlay ◽  
...  
Keyword(s):  
Bacterial Resistance ◽  
Pediatric Patients ◽  
Acute Otitis Media ◽  
Polymyxin B ◽  
Current Level ◽  
Beta Lactamase ◽  
Causative Pathogen ◽  
In Vitro Activity ◽  
Acute Conjunctivitis

ABSTRACT We sought to determine the current level of resistance inHaemophilus influenzae and Streptococcus pneumoniae, the primary pathogens of pediatric conjunctivitis. Between January 1997 and March 1998, we prospectively cultured acute conjunctivitis in 250 ambulatory pediatric patients from rural Kentucky whose average age was 24.3 months. In those 250 cases, 106 H. influenzae (42% of the total) and 75 S. pneumoniae(30% of the total) pathogens were isolated, with no growth or no pathogen resulting in 79 cases (32% of the total). Beta-lactamase was detected in 60 (69%) of 87 tested strains of H. influenzae. Among 65 isolates of S. pneumoniae tested for penicillin susceptibility, 44 (68%) were susceptible, 17 (26%) were resistant, and 4 (6%) were intermediate. Conjunctivitis with acute otitis media was observed in 97 patients (39%), and H. influenzae was recovered in 57% of these 97 cases. As for in vitro activity, ciprofloxacin, ofloxacin, and tetracycline were the most active; and gentamicin, tobramycin, polymyxin B-trimethoprim, and polymyxin B-neomycin were intermediately active. Sulfamethoxazole possessed no activity against either pathogen. Beta-lactamase production was detected in 69% of H. influenzae strains, which still remains the primary causative pathogen of both conjunctivitis and conjunctivitis-otitis syndrome. Penicillin-nonsusceptible S. pneumoniae was observed in 32% of 65 patients with S. pneumoniae conjunctivitis, with most strains being penicillin resistant.

scholarly journals The Pattern of Organism Causing Urinary Tract Infection in Diabetic and Non Diabetic Patients in Bangladesh

1970 ◽  
Vol 4 (1) ◽  
pp. 6-8 ◽  
Author(s):  
Md Hamza Saber ◽  
Lovely Barai ◽  
J Ashraful Haq ◽  
Md Shariful Alam Jilani ◽  
Jaheda Begum
Keyword(s):  
Urinary Tract Infection ◽  
Urinary Tract ◽  
Tract Infection ◽  
Diabetic Patient ◽  
Bacterial Resistance ◽  
Diabetic Patients ◽  
Beta Lactamase ◽  
Extended Spectrum Beta Lactamase ◽  
Extended Spectrum ◽  
Sensitivity Pattern

Urinary tract infection (UTI) is common both in the diabetic and non-diabetic patients. The widespread use of antimicrobial agents leads to emergence of resistant microorganisms. Since the pattern of bacterial resistance is constantly changing, the monitoring of the antimicrobial susceptibilities of the predominantly isolated organisms becomes more important. Aim of this study was to determine the etiologic agents and their antibiotic sensitivity pattern in both diabetic and non-diabetic patients with urinary tract infection (UTI). A total of 288 diabetics (196 female and 92 males) and 63 non diabetic patients (43 female and 20 males) with symptomatic UTI were included in this study. Among the study cases, 43.8% diabetic patients and 42.9% non-diabetic patients had positive growth from urine. Rate of isolation of Escherichia coli in diabetic was less (61.8%) compared to non diabetic (77.8%). Rate of other organisms isolated in diabetic and non diabetic patients were respectively: Klebsiella sp 6.9% vs 3.7%, Enterococcus 12.2% vs3.7%, Pseudomonas species 3.8% vs 0%, Candida species 4.6% versus 3.7%, Staphylococcus aureus 4.6% versus 7.4% etc. E coli isolated from diabetic patient was significantly (p<0.05) less sensitive to ceftriaxone, ceftazidime, cefuroxime, netilmicin, gentamicin, ciprofloxacin and nitrofurantoin than that of non diabetic patients. In addition, isolation rate of the Extended Spectrum Beta Lactamase producing gram negative bacilli was found higher among diabetic population (47.8%) compared to the non-diabetics (9.1%). Key words: Urinary tract infection (UTI), Diabetic and non diabetic patient, Extended Spectrum Beta Lactamase. DOI: http://dx.doi.org/10.3329/bjmm.v4i1.8461 BJMM 2011; 4(1): 6-8

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