ß-lactamases produced by amoxicillin-clavulanate-resistant enterobacteria isolated in Buenos Aires, Argentina: A new blaTEMgene
Resistance to ß-lactam/ß-lactamase inhibitors in enterobacteria is a growing problem that has not been intensively studied in Argentina. In the present work, 54/843 enterobacteria collected in a teaching hospital of Buenos Aires city were ampicillin-sulbactam-resistant isolates remaining susceptible...
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doaj-ed9e648a46f6411d9ab3b844c5d049572020-11-25T03:53:49ZengElsevier EspañaRevista Argentina de Microbiología1851-7617463210217S0325-75412014000400008ß-lactamases produced by amoxicillin-clavulanate-resistant enterobacteria isolated in Buenos Aires, Argentina: A new blaTEMgeneJosé A Di Conza0Alejandra Badaracco1Juan Ayala2Cynthia Rodriguez3Ángela Famiglietti4Gabriel O Gutkind5UBAUBACSIC - UAMUBAUBAUBAResistance to ß-lactam/ß-lactamase inhibitors in enterobacteria is a growing problem that has not been intensively studied in Argentina. In the present work, 54/843 enterobacteria collected in a teaching hospital of Buenos Aires city were ampicillin-sulbactam-resistant isolates remaining susceptible to second-and third-generation cephalosporins. The enzymatic mechanisms present in the isolates, which were also amoxicillin-clavulanic acid (AMC)-resistant (18/54) were herein analyzed. Sequencing revealed two different variants of blaTEM-1, being blaTEM-1b the most frequently detected allelle (10 Escherichia coli, 3 Klebsiella pneumoniae, 2 Proteus mirabilis and 1 Raoultella terrigena) followed by blaTEM-1a(1 K. pneumoniae). Amoxicillin-clavulanate resistance seems to be mainly associated with TEM-1 overproduction (mostly in E. coli) or co-expressed with OXA-2-like and/or SHV ß-lactamases (K. pneumoniae and P. mirabilis). A new blaTEMvariant (TEM-163) was described in an E. coli strain having an AMC MIC value of 16/8 µg/ml. TEM-163 contains Arg275Gln and His289Leu amino acid substitutions. On the basis of the high specific activity and low IC50 for clavulanic acid observed, the resistance pattern seems to be due to overproduction of the new variant of broad spectrumß-lactamase rather than to an inhibitor-resistant TEM (IRT)-like behavior.http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0325-75412014000400008&lng=en&tlng=enResistencia a amoxicilina-ácido clavulánicoTEM-163EnterobacteriaHiperproducción de TEM-1 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
José A Di Conza Alejandra Badaracco Juan Ayala Cynthia Rodriguez Ángela Famiglietti Gabriel O Gutkind |
spellingShingle |
José A Di Conza Alejandra Badaracco Juan Ayala Cynthia Rodriguez Ángela Famiglietti Gabriel O Gutkind ß-lactamases produced by amoxicillin-clavulanate-resistant enterobacteria isolated in Buenos Aires, Argentina: A new blaTEMgene Revista Argentina de Microbiología Resistencia a amoxicilina-ácido clavulánico TEM-163 Enterobacteria Hiperproducción de TEM-1 |
author_facet |
José A Di Conza Alejandra Badaracco Juan Ayala Cynthia Rodriguez Ángela Famiglietti Gabriel O Gutkind |
author_sort |
José A Di Conza |
title |
ß-lactamases produced by amoxicillin-clavulanate-resistant enterobacteria isolated in Buenos Aires, Argentina: A new blaTEMgene |
title_short |
ß-lactamases produced by amoxicillin-clavulanate-resistant enterobacteria isolated in Buenos Aires, Argentina: A new blaTEMgene |
title_full |
ß-lactamases produced by amoxicillin-clavulanate-resistant enterobacteria isolated in Buenos Aires, Argentina: A new blaTEMgene |
title_fullStr |
ß-lactamases produced by amoxicillin-clavulanate-resistant enterobacteria isolated in Buenos Aires, Argentina: A new blaTEMgene |
title_full_unstemmed |
ß-lactamases produced by amoxicillin-clavulanate-resistant enterobacteria isolated in Buenos Aires, Argentina: A new blaTEMgene |
title_sort |
ß-lactamases produced by amoxicillin-clavulanate-resistant enterobacteria isolated in buenos aires, argentina: a new blatemgene |
publisher |
Elsevier España |
series |
Revista Argentina de Microbiología |
issn |
1851-7617 |
description |
Resistance to ß-lactam/ß-lactamase inhibitors in enterobacteria is a growing problem that has not been intensively studied in Argentina. In the present work, 54/843 enterobacteria collected in a teaching hospital of Buenos Aires city were ampicillin-sulbactam-resistant isolates remaining susceptible to second-and third-generation cephalosporins. The enzymatic mechanisms present in the isolates, which were also amoxicillin-clavulanic acid (AMC)-resistant (18/54) were herein analyzed. Sequencing revealed two different variants of blaTEM-1, being blaTEM-1b the most frequently detected allelle (10 Escherichia coli, 3 Klebsiella pneumoniae, 2 Proteus mirabilis and 1 Raoultella terrigena) followed by blaTEM-1a(1 K. pneumoniae). Amoxicillin-clavulanate resistance seems to be mainly associated with TEM-1 overproduction (mostly in E. coli) or co-expressed with OXA-2-like and/or SHV ß-lactamases (K. pneumoniae and P. mirabilis). A new blaTEMvariant (TEM-163) was described in an E. coli strain having an AMC MIC value of 16/8 µg/ml. TEM-163 contains Arg275Gln and His289Leu amino acid substitutions. On the basis of the high specific activity and low IC50 for clavulanic acid observed, the resistance pattern seems to be due to overproduction of the new variant of broad spectrumß-lactamase rather than to an inhibitor-resistant TEM (IRT)-like behavior. |
topic |
Resistencia a amoxicilina-ácido clavulánico TEM-163 Enterobacteria Hiperproducción de TEM-1 |
url |
http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0325-75412014000400008&lng=en&tlng=en |
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