| Autor: |
Taruna Anand, Nitin Virmani, Sudarshan Kumar, Ashok Kumar Mohanty, S. Pavulraj, Bidhan Ch. Bera, Rajesh K. Vaid, Umang Ahlawat, B.N. Tripathi |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Journal of Global Antimicrobial Resistance, Vol 21, Iss , Pp 34-41 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2213-7165 |
| DOI: |
10.1016/j.jgar.2019.09.018 |
| Popis: |
Objectives: Klebsiella pneumoniae is an important emerging pathogen of humans and animals leading to serious clinical consequences. Increased antibiotic use has promoted the emergence of carbapenem-resistant and extended-spectrum β-lactamase (ESBL)-producing K. pneumoniae strains. Recently, phage therapy has gained momentum as a possible alternative against emerging antimicrobial resistance. This study was performed to assess the therapeutic effects of a novel lytic phage (VTCCBPA43) in a pneumonic mouse model in order to explore the efficacy of phage therapy against virulent K. pneumoniae infection. Methods: The tailed phage VTCCBPA43 was assessed for its growth kinetics, in vitro host range, and temperature and pH sensitivity. Protein constituents were analysed by SDS-PAGE and nLC-MS/MS. Therapeutic efficacy was observed 2 h post-challenge with virulent K. pneumoniae in a BALB/c mouse model. Results: Phage VTCCBPA43 was found to be highly temperature-tolerant (up to 80 °C). It was most active at pH 5, had a burst size of 172 PFU/mL and exhibited a narrow host range. It was identified as a KP36-like phage by shotgun proteomics. Following intranasal application of a single dose (2 × 109 PFU/mouse) post-challenge with virulent K. pneumoniae, the presence of biologically active phage in vivo and a significant reduction in the lung bacterial load at all time points was observed. A reduction in lesion severity suggested overall beneficial effects of VTCCBPA43 phage therapy in the pneumonic mouse model. Conclusion: This research represents the first in vivo evidence of effective phage therapy against K. pneumoniae infection by the intranasal route. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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Full Text from ScienceDirect