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Plant Compounds Enhance the Assay Sensitivity for Detection of Active Bacillus cereus Toxin

Bacillus cereus is an important food pathogen, producing emetic and diarrheal syndromes, the latter mediated by enterotoxins. The ability to sensitively trace and identify this active toxin is important for food safety. This study evaluated a nonradioactive, sensitive, in vitro cell-based assay, bas...

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Autores principales: Rasooly, Reuven, Hernlem, Bradley, He, Xiaohua, Friedman, Mendel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4379528/
https://www.ncbi.nlm.nih.gov/pubmed/25767986
http://dx.doi.org/10.3390/toxins7030835
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author Rasooly, Reuven
Hernlem, Bradley
He, Xiaohua
Friedman, Mendel
author_facet Rasooly, Reuven
Hernlem, Bradley
He, Xiaohua
Friedman, Mendel
author_sort Rasooly, Reuven
collection PubMed
description Bacillus cereus is an important food pathogen, producing emetic and diarrheal syndromes, the latter mediated by enterotoxins. The ability to sensitively trace and identify this active toxin is important for food safety. This study evaluated a nonradioactive, sensitive, in vitro cell-based assay, based on B. cereus toxin inhibition of green fluorescent protein (GFP) synthesis in transduced monkey kidney Vero cells, combined with plant extracts or plant compounds that reduce viable count of B. cereus in food. The assay exhibited a dose dependent GFP inhibition response with ~25% inhibition at 50 ng/mL toxin evaluated in culture media or soy milk, rice milk or infant formula, products associated with food poisonings outbreak. The plant extracts of green tea or bitter almond and the plant compounds epicatechin or carvacrol were found to amplify the assay response to ~90% inhibition at the 50 ng/mL toxin concentration greatly increasing the sensitivity of this assay. Additional studies showed that the test formulations also inhibited the growth of the B. cereus bacteria, likely through cell membrane disruption. The results suggest that the improved highly sensitive assay for the toxin and the rapid inactivation of the pathogen producing the toxin have the potential to enhance food safety.
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spelling pubmed-43795282015-05-18 Plant Compounds Enhance the Assay Sensitivity for Detection of Active Bacillus cereus Toxin Rasooly, Reuven Hernlem, Bradley He, Xiaohua Friedman, Mendel Toxins (Basel) Article Bacillus cereus is an important food pathogen, producing emetic and diarrheal syndromes, the latter mediated by enterotoxins. The ability to sensitively trace and identify this active toxin is important for food safety. This study evaluated a nonradioactive, sensitive, in vitro cell-based assay, based on B. cereus toxin inhibition of green fluorescent protein (GFP) synthesis in transduced monkey kidney Vero cells, combined with plant extracts or plant compounds that reduce viable count of B. cereus in food. The assay exhibited a dose dependent GFP inhibition response with ~25% inhibition at 50 ng/mL toxin evaluated in culture media or soy milk, rice milk or infant formula, products associated with food poisonings outbreak. The plant extracts of green tea or bitter almond and the plant compounds epicatechin or carvacrol were found to amplify the assay response to ~90% inhibition at the 50 ng/mL toxin concentration greatly increasing the sensitivity of this assay. Additional studies showed that the test formulations also inhibited the growth of the B. cereus bacteria, likely through cell membrane disruption. The results suggest that the improved highly sensitive assay for the toxin and the rapid inactivation of the pathogen producing the toxin have the potential to enhance food safety. MDPI 2015-03-11 /pmc/articles/PMC4379528/ /pubmed/25767986 http://dx.doi.org/10.3390/toxins7030835 Text en © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Rasooly, Reuven
Hernlem, Bradley
He, Xiaohua
Friedman, Mendel
Plant Compounds Enhance the Assay Sensitivity for Detection of Active Bacillus cereus Toxin
title Plant Compounds Enhance the Assay Sensitivity for Detection of Active Bacillus cereus Toxin
title_full Plant Compounds Enhance the Assay Sensitivity for Detection of Active Bacillus cereus Toxin
title_fullStr Plant Compounds Enhance the Assay Sensitivity for Detection of Active Bacillus cereus Toxin
title_full_unstemmed Plant Compounds Enhance the Assay Sensitivity for Detection of Active Bacillus cereus Toxin
title_short Plant Compounds Enhance the Assay Sensitivity for Detection of Active Bacillus cereus Toxin
title_sort plant compounds enhance the assay sensitivity for detection of active bacillus cereus toxin
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4379528/
https://www.ncbi.nlm.nih.gov/pubmed/25767986
http://dx.doi.org/10.3390/toxins7030835
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