Journal
MICROBIAL PATHOGENESIS
Volume 103, Issue -, Pages 167-177Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.micpath.2016.12.022
Keywords
Biofilm; Legistromia speciosa L.; Graphene oxide-silver nanocomposite; Streptococcus mutans; Enterobacter cloacae; Quantitative RT-PCR
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Funding
- Department of Biotechnology (DBT), government of India
- Council of Scientific and Industrial Research [37(1576)/13/EMR-II]
- BSR-UGC SRF
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Biofilm architecture provides bacteria with enhanced antibiotic resistance, thus raising the need to search for alternative therapies that can inhibit the bacterial colonization. In the present study, we synthesized graphene oxide-silver nanocomposite (GO-Ag) by non-toxic and eco-friendly route using a floral extract of Legistromia speciosa (L) Pers. The gas chromatography-mass spectrometry (GC-MS) analysis of plant extract revealed the presence of compounds which can simultaneously act as reducing and capping agents. The sub-inhibitory concentrations of synthesized GO-Ag reduced the biofilm formation in both gram-negative (E. cloacae) and gram-positive (S. mutans) bacterial models. Growth curve assay, membrane integrity assay, scanning electron microscopy (SEM) and confocal scanning laser microscopy (CSLM) revealed different mechanisms of biofilm inhibition in E. cloacae and S. mutans. Moreover, quantitative RT-PCR (qRT-PCR) results suggested GO-Ag is acting on S. mutans biofilm formation cascade. Biofilm inhibitory concentrations GO-Ag were also found to be non-toxic against HEK-293 (human embryonic kidney cell line). The whole study highlights the therapeutic potential of GO-Ag to restrain the onset of biofilm formation in bacteria. (C) 2016 Elsevier Ltd. All rights reserved.
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