title: Antibiotic resistance and multidrug-resistant efflux pumps expression in lactic acid bacteria isolated from pozol, a nonalcoholic Mayan maize fermented beverage.
abstract: Pozol is a handcrafted nonalcoholic Mayan beverage produced by the spontaneous fermentation of maize dough by lactic acid bacteria. Lactic acid bacteria (LAB) are carriers of chromosomal encoded multidrug-resistant efflux pumps genes that can be transferred to pathogens and/or confer resistance to compounds released during the fermentation process causing food spoiling. The aim of this study was to evaluate the antibiotic sensibility and the transcriptional expression of ABC-type efflux pumps in LAB isolated from pozol that contributes to multidrug resistance. Analysis of LAB and Staphylococcus (S.) aureus ATCC 29213 and ATCC 6538 control strains to antibiotic susceptibility, minimal inhibitory concentration (MIC), and minimal bactericidal concentration (MBC) to ethidium bromide were based in "standard methods" whereas the ethidium bromide efflux assay was done by fluorometric assay. Transcriptional expression of efflux pumps was analyzed by RT-PCR. LAB showed antibiotic multiresistance profiles, moreover, Lactococcus (L.) lactis and Lactobacillus (L.) plantarum displayed higher ethidium bromide efflux phenotype than S. aureus control strains. Ethidium bromide resistance and ethidium bromide efflux phenotypes were unrelated with the overexpression of lmrD in L. lactics, or the underexpression of lmrA in L. plantarum and norA in S. aureus. These findings suggest that, moreover, the analyzed efflux pumps genes, other unknown redundant mechanisms may underlie the antibiotic resistance and the ethidium bromide efflux phenotype in L. lactis and L. plantarum. Phenotypic and molecular drug multiresistance assessment in LAB may improve a better selection of the fermentation starter cultures used in pozol, and to control the antibiotic resistance widespread and food spoiling for health safety.
authors.affiliation: Depto de Alimentos y Biotecnología Facultad de Química UNAM Ciudad Universitaria Coyoacán 04510 México Distrito Federal México.
authors.forename: Maria Del Carmen
authors.initials: Mdel C
authors.lastname: Wacher-Rodarte
authors.affiliation: Depto de Alimentos y Biotecnología Facultad de Química UNAM Ciudad Universitaria Coyoacán 04510 México Distrito Federal México.
authors.forename: Tanya Paulina
authors.initials: TP
authors.lastname: Trejo-Muñúzuri
authors.affiliation: Depto de Bioquímica Facultad de Química UNAM Ciudad Universitaria Coyoacán 04510 México Distrito Federal México.
authors.forename: Jesús Fernando
authors.initials: JF
authors.lastname: Montiel-Aguirre
authors.affiliation: Depto. Sistemas Biológicos UAM-Xochimilco Calzada del Hueso No.1100, Coyoacan 04960 Mexico Distrito Federal México.
authors.forename: Maria Elisa
authors.initials: ME
authors.lastname: Drago-Serrano
authors.affiliation: Depto. Sistemas Biológicos UAM-Xochimilco Calzada del Hueso No.1100, Coyoacan 04960 Mexico Distrito Federal México.
authors.forename: Raúl L
authors.initials: RL
authors.lastname: Gutiérrez-Lucas
authors.affiliation: Depto. Sistemas Biológicos UAM-Xochimilco Calzada del Hueso No.1100, Coyoacan 04960 Mexico Distrito Federal México.
authors.forename: Jorge Ismael
authors.initials: JI
authors.lastname: Castañeda-Sánchez
authors.affiliation: Depto. Sistemas Biológicos UAM-Xochimilco Calzada del Hueso No.1100, Coyoacan 04960 Mexico Distrito Federal México.
authors.forename: Teresita
authors.initials: T
authors.lastname: Sainz-Espuñes
keywords: Antibiotic resistance; Mayan‐pozol; efflux pumps; ethidium‐bromide; lactic‐acid‐bacteria