Abstract
Biofilms are microbial communities with genetically divergent microorganisms. Such communal behavior is known to provide survival benefit to the unicellular organisms in adverse conditions. Pathogenicity of opportunistic bacterial pathogens largely depends on their success in proper quorum establishment and biofilm formation. Thus molecules causing quorum-sensing attenuation, preventing the biofilm formation or instigating preformed biofilm dislodgement could serve as attractive drugs/drug supplements. Here we investigate the effect of nisin—type A lantibiotic naturally produced by Lactococcus lactis—on laboratory developed Escherichia coli biofilms and on isolated human neutrophils. Activity evaluation was done on the biofilms of clinical isolates of E. coli, developed on glass slides in a simple static bioreactor design. Nisin not only inhibited the formation but also effectively dislodged the preformed E. coli biofilms developed on glass surfaces. Presence of nisin also demonstrated a significant decrease in the expression of E. coli virulence factors viz. hemolysin and curli expression. The microorganisms dislodged from the biofilms and set free in the circulation of infected host might later reassociate to form new biofilms after nisin clearance from circulation. Thus complete eradication of infective bacterium will depend on stimulatory effect of nisin (if any) on human immune system cells. Therefore modulation of human neutrophil activity by nisin was also evaluated. Presence of nisin induced neutrophil extracellular trap (NET) formation or NETosis in a manner similar to that demonstrated by LPS (lipopolysaccharide) in vitro. Our results thus present nisin as a plausible molecule to be used in treatment of chronic bacterial infections as it indicated increased fitness for the same.
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Abbreviations
- AMP:
-
Antimicrobial peptide
- BIC:
-
Biofilm inhibitory concentration
- CR:
-
Congo Red
- DMSO:
-
Dimethyl sulfoxide
- HBSS:
-
Hanks’ balance salt solution
- LPS:
-
Lipopolysaccharide
- NET:
-
Neutrophil extracellular trap
- NBT:
-
Nitroblue tetrazolium
- PMN:
-
Polymorphonuclear neutrophils
- PBS:
-
Phosphate buffered saline
- PMA:
-
Phorbol-12-myristate-13-acetate
- ROS:
-
Reactive oxygen species
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Acknowledgments
We would like to acknowledge University Grants Commission, India, for providing financial sanction for the study and would also like to thank Dr. Dipti Christian, Principal, Hislop College, Nagpur, for making all the necessary infrastructural facilities available.
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Begde, D.N., Bundale, S.B., Pise, M.V. et al. In Vitro Modulation of E. coli Community Behavior and Human Innate Immune System by Lantibiotic Nisin. Int J Pept Res Ther 18, 171–183 (2012). https://doi.org/10.1007/s10989-012-9290-3
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DOI: https://doi.org/10.1007/s10989-012-9290-3