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Sensors 2013, 13(4), 5117-5129; doi:10.3390/s130405117

Caffeine as a Potential Quorum Sensing Inhibitor

Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
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Received: 25 February 2013 / Revised: 10 April 2013 / Accepted: 16 April 2013 / Published: 18 April 2013
(This article belongs to the Section Biosensors)
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Abstract

Quorum sensing enables bacteria to control the gene expression in response to the cell density. It regulates a variety of bacterial physiological functions such as biofilm formation, bioluminescence, virulence factors and swarming which has been shown contribute to bacterial pathogenesis. The use of quorum sensing inhibitor would be of particular interest in treating bacterial pathogenicity and infections. In this work, we have tested caffeine as quorum sensing inhibitor by using Chromobacterium violaceum CV026 as a biosensor. We verified that caffeine did not degrade the N-acyl homoserine lactones tested. In this work, it is shown that caffeine could inhibit N-acyl homoserine lactone production and swarming of a human opportunistic pathogen, namely Pseudomonas aeruginosa PA01. To the best of our knowledge, this is the first documentation providing evidence on the presence of anti-quorum sensing activity in caffeine. Our work will allow caffeine to be explored as anti-infective drugs.
Keywords: AHL synthesis inhibition; anti-infective drugs; Chromobacterium violaceum CV026; N-acyl-L-homoserine lactones (AHL); Pseudomonas aeruginosa PA01; swarming; quorum sensing inhibitor; virulence AHL synthesis inhibition; anti-infective drugs; Chromobacterium violaceum CV026; N-acyl-L-homoserine lactones (AHL); Pseudomonas aeruginosa PA01; swarming; quorum sensing inhibitor; virulence
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Norizan, S.N.M.; Yin, W.-F.; Chan, K.-G. Caffeine as a Potential Quorum Sensing Inhibitor. Sensors 2013, 13, 5117-5129.

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