Antibiofilm and antivirulence efficacy of myrtenol enhances the antibiotic susceptibility of Acinetobacter baumannii
Abstract Acinetobacter baumannii (AB) is rising as a human pathogen of critical priority worldwide as it is the leading cause of chronic opportunistic infections in healthcare settings and the condition is ineradicable with antibiotic therapy. AB possesses the ability to form biofilm on abiotic as w...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2020-12-01
|
| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-020-79128-x |
| _version_ | 1818857651104120832 |
|---|---|
| author | Anthonymuthu Selvaraj Alaguvel Valliammai Chandran Sivasankar Manokaran Suba Ganeshkumar Sakthivel Shunmugiah Karutha Pandian |
| author_facet | Anthonymuthu Selvaraj Alaguvel Valliammai Chandran Sivasankar Manokaran Suba Ganeshkumar Sakthivel Shunmugiah Karutha Pandian |
| author_sort | Anthonymuthu Selvaraj |
| collection | DOAJ |
| description | Abstract Acinetobacter baumannii (AB) is rising as a human pathogen of critical priority worldwide as it is the leading cause of chronic opportunistic infections in healthcare settings and the condition is ineradicable with antibiotic therapy. AB possesses the ability to form biofilm on abiotic as well as biotic surfaces which plays a major role in its pathogenesis and resistance in clinical settings. Hence, the demand for an alternative therapy to combat the biofilm-associated infections is increasing. The present study explored the antibiofilm potential of myrtenol, a bicyclic monoterpene present in various plants against reference and clinical strains of AB. Myrtenol (200 μg/mL) exhibited a strong antibiofilm activity without exerting any harmful effect on growth and metabolic viability of AB strains. Microscopic analyses confirmed the reduction in the biofilm thickness and surface coverage upon myrtenol treatment. Especially, myrtenol was found to be effective in disrupting the mature biofilms of tested AB strains. Furthermore, myrtenol inhibited the biofilm-associated virulence factors of AB strains such as extracellular polysaccharide, cell surface hydrophobicity, oxidant resistance, swarming and twitching motility. Transcriptional analysis unveiled the suppression of the biofilm-associated genes such as bfmR, csuA/B, bap, ompA, pgaA, pgaC, and katE by myrtenol. Notably, myrtenol improved the susceptibility of AB strains towards conventional antibiotics such as amikacin, ciprofloxacin, gentamicin and trimethoprim. Thus, the present study demonstrates the therapeutic potential of myrtenol against biofilm-associated infections of AB. |
| first_indexed | 2024-12-19T08:43:47Z |
| format | Article |
| id | doaj.art-243e150e27824ac993f69a5b8526405f |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-19T08:43:47Z |
| publishDate | 2020-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-243e150e27824ac993f69a5b8526405f2022-12-21T20:28:51ZengNature PortfolioScientific Reports2045-23222020-12-0110111410.1038/s41598-020-79128-xAntibiofilm and antivirulence efficacy of myrtenol enhances the antibiotic susceptibility of Acinetobacter baumanniiAnthonymuthu Selvaraj0Alaguvel Valliammai1Chandran Sivasankar2Manokaran Suba3Ganeshkumar Sakthivel4Shunmugiah Karutha Pandian5Department of Biotechnology, Alagappa UniversityDepartment of Biotechnology, Alagappa UniversityDepartment of Biotechnology, Alagappa UniversityDepartment of Biotechnology, Alagappa UniversityDepartment of Biotechnology, Alagappa UniversityDepartment of Biotechnology, Alagappa UniversityAbstract Acinetobacter baumannii (AB) is rising as a human pathogen of critical priority worldwide as it is the leading cause of chronic opportunistic infections in healthcare settings and the condition is ineradicable with antibiotic therapy. AB possesses the ability to form biofilm on abiotic as well as biotic surfaces which plays a major role in its pathogenesis and resistance in clinical settings. Hence, the demand for an alternative therapy to combat the biofilm-associated infections is increasing. The present study explored the antibiofilm potential of myrtenol, a bicyclic monoterpene present in various plants against reference and clinical strains of AB. Myrtenol (200 μg/mL) exhibited a strong antibiofilm activity without exerting any harmful effect on growth and metabolic viability of AB strains. Microscopic analyses confirmed the reduction in the biofilm thickness and surface coverage upon myrtenol treatment. Especially, myrtenol was found to be effective in disrupting the mature biofilms of tested AB strains. Furthermore, myrtenol inhibited the biofilm-associated virulence factors of AB strains such as extracellular polysaccharide, cell surface hydrophobicity, oxidant resistance, swarming and twitching motility. Transcriptional analysis unveiled the suppression of the biofilm-associated genes such as bfmR, csuA/B, bap, ompA, pgaA, pgaC, and katE by myrtenol. Notably, myrtenol improved the susceptibility of AB strains towards conventional antibiotics such as amikacin, ciprofloxacin, gentamicin and trimethoprim. Thus, the present study demonstrates the therapeutic potential of myrtenol against biofilm-associated infections of AB.https://doi.org/10.1038/s41598-020-79128-x |
| spellingShingle | Anthonymuthu Selvaraj Alaguvel Valliammai Chandran Sivasankar Manokaran Suba Ganeshkumar Sakthivel Shunmugiah Karutha Pandian Antibiofilm and antivirulence efficacy of myrtenol enhances the antibiotic susceptibility of Acinetobacter baumannii Scientific Reports |
| title | Antibiofilm and antivirulence efficacy of myrtenol enhances the antibiotic susceptibility of Acinetobacter baumannii |
| title_full | Antibiofilm and antivirulence efficacy of myrtenol enhances the antibiotic susceptibility of Acinetobacter baumannii |
| title_fullStr | Antibiofilm and antivirulence efficacy of myrtenol enhances the antibiotic susceptibility of Acinetobacter baumannii |
| title_full_unstemmed | Antibiofilm and antivirulence efficacy of myrtenol enhances the antibiotic susceptibility of Acinetobacter baumannii |
| title_short | Antibiofilm and antivirulence efficacy of myrtenol enhances the antibiotic susceptibility of Acinetobacter baumannii |
| title_sort | antibiofilm and antivirulence efficacy of myrtenol enhances the antibiotic susceptibility of acinetobacter baumannii |
| url | https://doi.org/10.1038/s41598-020-79128-x |
| work_keys_str_mv | AT anthonymuthuselvaraj antibiofilmandantivirulenceefficacyofmyrtenolenhancestheantibioticsusceptibilityofacinetobacterbaumannii AT alaguvelvalliammai antibiofilmandantivirulenceefficacyofmyrtenolenhancestheantibioticsusceptibilityofacinetobacterbaumannii AT chandransivasankar antibiofilmandantivirulenceefficacyofmyrtenolenhancestheantibioticsusceptibilityofacinetobacterbaumannii AT manokaransuba antibiofilmandantivirulenceefficacyofmyrtenolenhancestheantibioticsusceptibilityofacinetobacterbaumannii AT ganeshkumarsakthivel antibiofilmandantivirulenceefficacyofmyrtenolenhancestheantibioticsusceptibilityofacinetobacterbaumannii AT shunmugiahkaruthapandian antibiofilmandantivirulenceefficacyofmyrtenolenhancestheantibioticsusceptibilityofacinetobacterbaumannii |