Antibiotic Susceptibility of Biofilm Cells and Molecular Characterisation of Staphylococcus hominis Isolates from Blood
Objectives We aimed to characterise the staphylococcal cassette chromosome mec (SCCmec) type, genetic relatedness, biofilm formation and composition, icaADBC genes detection, icaD expression, and antibiotic susceptibility of planktonic and biofilm cells of Staphylococcus hominis isolates from bloo...
| Autores principales: | , , , , , , , , , |
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| Formato: | Artículo |
| Lenguaje: | inglés |
| Publicado: |
2015
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| Materias: | |
| Acceso en línea: | http://eprints.uanl.mx/14892/1/103.PDF |
| _version_ | 1824414179366273024 |
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| author | Horsburgh, Malcolm James Mendoza Olazarán, Soraya Sarahí Morfín Otero, Rayo Villarreal Treviño, Licet Rodríguez Noriega, Eduardo Llaca Díaz, Jorge Martín Camacho Ortiz, Adrián González González, Gloria María Casillas Vega, Néstor Guadalupe Garza González, Elvira |
| author_facet | Horsburgh, Malcolm James Mendoza Olazarán, Soraya Sarahí Morfín Otero, Rayo Villarreal Treviño, Licet Rodríguez Noriega, Eduardo Llaca Díaz, Jorge Martín Camacho Ortiz, Adrián González González, Gloria María Casillas Vega, Néstor Guadalupe Garza González, Elvira |
| author_sort | Horsburgh, Malcolm James |
| collection | Repositorio Institucional |
| description | Objectives
We aimed to characterise the staphylococcal cassette chromosome mec (SCCmec) type, genetic relatedness, biofilm formation and composition, icaADBC genes detection, icaD expression, and antibiotic susceptibility of planktonic and biofilm cells of Staphylococcus
hominis isolates from blood.
Methods The study included 67 S. hominis blood isolates. Methicillin resistance was evaluated with
the cefoxitin disk test. mecA gene and SCCmec were detected by multiplex PCR. Genetic relatedness was determined by pulsed-field gel electrophoresis. Biofilm formation and composition were evaluated by staining with crystal violet and by detachment assay, respectively;
and the biofilm index (BI) was determined. Detection and expression of icaADB Cgenes were performed by multiplex PCR and real-time PCR, respectively. Antibiotic susceptibilities of planktonic cells (minimum inhibitory concentration, MIC) and biofilm cells
(minimum biofilm eradication concentration, MBEC) were determined by the broth dilution method.
Results
Eighty-five percent (57/67) of isolates were methicillin resistant and mecA positive. Of the mecA-positive isolates, 66.7% (38/57) carried a new putative SCCmec type. Four clones were detected, with two to five isolates each. Among all isolates, 91% (61/67) were categorised as strong biofilm producers. Biofilm biomass composition was heterogeneous (polysaccharides,
proteins and DNA). All isolates presented the icaD gene, and 6.66% (1/15) isolates expressed icaD. This isolate presented the five genes of ica operon. Higher BI and
MBEC values than the MIC values were observed for amikacin, vancomycin, linezolid, oxacillin, ciprofloxacin, and chloramphenicol.
Conclusions
S. hominis isolates were highly resistant to methicillin and other antimicrobials. Most of the detected SCCmec types were different than those described for S. aureus. Isolates indicated low clonality. The results indicate that S. hominis is a strong biofilm producer with an
extracellular matrix with similar composition of proteins, DNA and N-acetylglucosamine; and presents high frequency and low expression of icaD gene. Biofilm production is associated with increased antibiotic resistance. |
| format | Article |
| id | eprints-14892 |
| institution | UANL |
| language | English |
| publishDate | 2015 |
| record_format | eprints |
| spelling | eprints-148922024-03-05T17:56:23Z http://eprints.uanl.mx/14892/ Antibiotic Susceptibility of Biofilm Cells and Molecular Characterisation of Staphylococcus hominis Isolates from Blood Horsburgh, Malcolm James Mendoza Olazarán, Soraya Sarahí Morfín Otero, Rayo Villarreal Treviño, Licet Rodríguez Noriega, Eduardo Llaca Díaz, Jorge Martín Camacho Ortiz, Adrián González González, Gloria María Casillas Vega, Néstor Guadalupe Garza González, Elvira QR Microbiología Objectives We aimed to characterise the staphylococcal cassette chromosome mec (SCCmec) type, genetic relatedness, biofilm formation and composition, icaADBC genes detection, icaD expression, and antibiotic susceptibility of planktonic and biofilm cells of Staphylococcus hominis isolates from blood. Methods The study included 67 S. hominis blood isolates. Methicillin resistance was evaluated with the cefoxitin disk test. mecA gene and SCCmec were detected by multiplex PCR. Genetic relatedness was determined by pulsed-field gel electrophoresis. Biofilm formation and composition were evaluated by staining with crystal violet and by detachment assay, respectively; and the biofilm index (BI) was determined. Detection and expression of icaADB Cgenes were performed by multiplex PCR and real-time PCR, respectively. Antibiotic susceptibilities of planktonic cells (minimum inhibitory concentration, MIC) and biofilm cells (minimum biofilm eradication concentration, MBEC) were determined by the broth dilution method. Results Eighty-five percent (57/67) of isolates were methicillin resistant and mecA positive. Of the mecA-positive isolates, 66.7% (38/57) carried a new putative SCCmec type. Four clones were detected, with two to five isolates each. Among all isolates, 91% (61/67) were categorised as strong biofilm producers. Biofilm biomass composition was heterogeneous (polysaccharides, proteins and DNA). All isolates presented the icaD gene, and 6.66% (1/15) isolates expressed icaD. This isolate presented the five genes of ica operon. Higher BI and MBEC values than the MIC values were observed for amikacin, vancomycin, linezolid, oxacillin, ciprofloxacin, and chloramphenicol. Conclusions S. hominis isolates were highly resistant to methicillin and other antimicrobials. Most of the detected SCCmec types were different than those described for S. aureus. Isolates indicated low clonality. The results indicate that S. hominis is a strong biofilm producer with an extracellular matrix with similar composition of proteins, DNA and N-acetylglucosamine; and presents high frequency and low expression of icaD gene. Biofilm production is associated with increased antibiotic resistance. 2015 Article PeerReviewed text en cc_by_nc_nd http://eprints.uanl.mx/14892/1/103.PDF http://eprints.uanl.mx/14892/1.haspreviewThumbnailVersion/103.PDF Horsburgh, Malcolm James y Mendoza Olazarán, Soraya Sarahí y Morfín Otero, Rayo y Villarreal Treviño, Licet y Rodríguez Noriega, Eduardo y Llaca Díaz, Jorge Martín y Camacho Ortiz, Adrián y González González, Gloria María y Casillas Vega, Néstor Guadalupe y Garza González, Elvira (2015) Antibiotic Susceptibility of Biofilm Cells and Molecular Characterisation of Staphylococcus hominis Isolates from Blood. PLOS ONE, 10 (12). e0144684. ISSN 1932-6203 http://doi.org/10.1371/journal.pone.0144684 doi:10.1371/journal.pone.0144684 |
| spellingShingle | QR Microbiología Horsburgh, Malcolm James Mendoza Olazarán, Soraya Sarahí Morfín Otero, Rayo Villarreal Treviño, Licet Rodríguez Noriega, Eduardo Llaca Díaz, Jorge Martín Camacho Ortiz, Adrián González González, Gloria María Casillas Vega, Néstor Guadalupe Garza González, Elvira Antibiotic Susceptibility of Biofilm Cells and Molecular Characterisation of Staphylococcus hominis Isolates from Blood |
| thumbnail | https://rediab.uanl.mx/themes/sandal5/images/online.png |
| title | Antibiotic Susceptibility of Biofilm Cells and Molecular Characterisation of Staphylococcus hominis Isolates from Blood |
| title_full | Antibiotic Susceptibility of Biofilm Cells and Molecular Characterisation of Staphylococcus hominis Isolates from Blood |
| title_fullStr | Antibiotic Susceptibility of Biofilm Cells and Molecular Characterisation of Staphylococcus hominis Isolates from Blood |
| title_full_unstemmed | Antibiotic Susceptibility of Biofilm Cells and Molecular Characterisation of Staphylococcus hominis Isolates from Blood |
| title_short | Antibiotic Susceptibility of Biofilm Cells and Molecular Characterisation of Staphylococcus hominis Isolates from Blood |
| title_sort | antibiotic susceptibility of biofilm cells and molecular characterisation of staphylococcus hominis isolates from blood |
| topic | QR Microbiología |
| url | http://eprints.uanl.mx/14892/1/103.PDF |
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