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Morphological analysis of the antimicrobial action of nitric oxide on Gram-negative pathogens using atomic force microscopy

Paper ID Volume ID Publish Year Pages File Format Full-Text
1296 81 2009 11 PDF Available
Title
Morphological analysis of the antimicrobial action of nitric oxide on Gram-negative pathogens using atomic force microscopy
Abstract

Atomic force microscopy (AFM) was used to study the morphological changes of two Gram-negative pathogens, Pseudomonas aeruginosa and Escherichia coli, after exposure to nitric oxide (NO). The time-dependent effects of NO released from a xerogel coating and the concentration-dependent effects rendered by a small molecule that releases NO in a bolus were examined and compared. Bacteria exhibited irregular and degraded exteriors. With NO-releasing surfaces, an increase in surface debris and disorganized adhesion patterns were observed compared to controls. Analysis of cell surface topography revealed that increasing membrane roughness correlated with higher doses of NO. At a lower total dose, NO delivered via a bolus resulted in greater membrane roughness than NO released from a surface via a sustained flux. At sub-inhibitory levels, treatment with amoxicillin, an antibiotic known to compromise the integrity of the cell wall, led to morphologies resembling those resulting from NO treatment. Our observations indicate that cell envelope deterioration is a visible consequence of NO-exposure for both Gram-negative species studied.

Keywords
Antimicrobial; Atomic force microscopy; Gram-negative; Morphology; Nitric oxide
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Morphological analysis of the antimicrobial action of nitric oxide on Gram-negative pathogens using atomic force microscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 5, Issue 5, June 2009, Pages 1405–1415
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us