1887

Abstract

The objective of this study was to evaluate the effect of the bacterial endotoxin LPS on biofilm formation . The effect of the LPS of , , and on six different species of , comprising ATCC 90028, ATCC 90030, ATCC 6258, ATCC 13803, ATCC 22019 and MYA 646, was studied using a standard biofilm assay. The metabolic activity of biofilms treated with LPS at 90 min, 24 h and 48 h was quantified by XTT reduction assay. Viable biofilm-forming cells were qualitatively analysed using confocal laser scanning microscopy (CLSM), while scanning electron microscopy (SEM) was employed to visualize the biofilm structure. Initially, adhesion of was significantly stimulated by and LPS. A significant inhibition of adhesion was noted for the following combinations: with LPS, with LPS, and , or with LPS (<0.05). After 24 h of incubation, a significant stimulation of initial colonization was noted for the following combinations: with LPS, with LPS. In contrast, a significant inhibition of biofilm formation was observed in with LPS, with LPS, with LPS and / with LPS (<0.05). On further incubation for 48 h, a significant enhancement of biofilm maturation was noted for the following combinations: with LPS, with LPS and with LPS, and a significant retardation was noted for with LPS, with LPS, with LPS and with LPS (<0.05). These findings were confirmed by SEM and CLSM analyses. In general, the inhibition of the biofilm development of LPS-treated spp was accompanied by a scanty architecture with a reduced numbers of cells compared with the profuse and densely colonized control biofilms. These data are indicative that bacterial LPSs modulate biofilm formation in a species-specific and time-dependent manner. The clinical and the biological relevance of these findings have yet to be explored.

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2010-10-01
2024-03-29
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