Abstract
Haemophilus parasuis (H. parasuis), the cause of the Glasser’s disease, is a potentially pathogenic gram-negative organism that colonizes the upper respiratory tract of pigs. The extraction of Blumea balsamifera DC., as a traditional Chinese herb, has shown great bacteriostatic effect against several common bacteria. To study the antibacterial effect on H. parasuis in vitro, this study evaluated the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of Blumea balsamifera DC. essential oil (BBO) as well as morphological changes in H. parasuis treated with it. Furthermore, changes in expression of total protein and key virulence factors were also assessed. Results showed that the MIC and MBC were 0.625 and 1.25 μg/mL, respectively. As the concentration of BBO increased, the growth curve inhibition became stronger. H. parasuis cells were damaged severely after treatment with BBO for 4 h, demonstrating plasmolysis and enlarged vacuoles, along with broken cell walls and membranes. Total protein and virulence factor expression in H. parasuis was significantly downregulated by BBO. Taken together, these results indicated a substantial antibacterial effect of BBO on H. parasuis.
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Abbreviations
- H. parasuis :
-
Haemophilus parasuis
- BBO:
-
Blumea balsamifera DC. essential oil
- S. aureus :
-
Staphylococcus aureus
- E. coli :
-
Escherichia coli
- B. cereus :
-
Bacillus cereus
- MIC:
-
Minimum inhibitory concentration
- MBC:
-
Minimum bactericidal concentration
- TSB:
-
Tryptic Soy Broth
- TSA:
-
Tryptic Soy Agar
- OsO4:
-
Osmium tetroxide
- CBB:
-
Coomassie Brilliant Blue
- SDS-PAGE:
-
SDS polyacrylamide gel electrophoresis
- VtaA:
-
Virulence-associated trimeric autotransporters
- OmpP:
-
Outer-membrane protein
- nanH:
-
Neuraminidase
- ppiB:
-
Peptidylprolyl isomerase B
- TEM:
-
Transmission electron microscope
- AT-2:
-
Trimeric autotransporters
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (no. 31872510). We thank Gillian Campbell, PhD, from Liwen Bianji, Edanz Group China (http://www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
Funding
This work was supported by National Natural Science Foundation of China under Grant (no. 31872510).
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Communicated by Erko Stackebrandt.
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He, C., Yang, P., Wang, L. et al. Antibacterial effect of Blumea balsamifera DC. essential oil against Haemophilus parasuis. Arch Microbiol 202, 2499–2508 (2020). https://doi.org/10.1007/s00203-020-01946-4
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DOI: https://doi.org/10.1007/s00203-020-01946-4