Effect of Lactobacillus Sp. Isolates Supernatant on Escherichia Coli O157:H7 Enhances the Role of Organic Acids Production As a Factor for Pathogen Control1

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Effect of Lactobacillus Sp. Isolates Supernatant on Escherichia Coli O157:H7 Enhances the Role of Organic Acids Production As a Factor for Pathogen Control1 Pesq. Vet. Bras. 35(4):353-359, abril 2015 DOI: 10.1590/S0100-736X2015000400007 Effect of Lactobacillus sp. isolates supernatant on Escherichia coli O157:H7 enhances the role of organic acids production as a factor for pathogen control1 Larissa B. Poppi2, Javier D. Rivaldi2,4, Thais S. Coutinho2, Claudete S. 3 3* and Ismael M. Mancilha2,5 ABSTRACT.-Astolfi-Ferreira , Antonio J. Piantino Ferreira Mancilha I.M. 2015. Effect of Lactobacillus sp. isolates supernatant on Escherichia coli O157:H7 enhancesPoppi L.B.,the roleRivaldi of organic J.D., Coutinho acids production T.S., Astolfi-Ferreira as a factor C.S., for Ferreira pathogen A.J.P. con &- trol. Pesquisa Veterinária Brasileira 35(4):353-359. de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Av. Prof. Dr. Orlando Mar- ques de Paiva 87, São Paulo, SP 05508-270, Brazil. E-mail: Departamento [email protected] de Patologia, Faculdade Many attempts have been made to establish the control of foodborne pathogens through Lactobacillus isolates and their metabolism products with success being obtained in sev- eral situations. The aim of this study was to investigate the antagonistic effect of eight Lac- tobacillus isolates, including L. casei subsp. pseudoplantarum, L. plantarum, L. reuteri and L. delbrueckii subsp. delbrueckii, on the pathogenic Escherichia coli strain O157:H7. The inhibitory effect of pure cultures and two pooled cultures supernatants of Lactobacillus on the growth of pathogenic bacteria was evaluated by the spot agar method and by monitor- L. reuteri and L. delbrueckii subsp. delbrueckii and for a pool of lactic acid bacteria. The neutralized supernatant of the pool ex- ing turbidity. Antimicrobial activity was confirmed for - tic acid and acetic acid were produced during growth of the Lactobacillus isolates studied. INDEXerted a TERMS: higher Lactobacillusantimicrobial, antagonism, activity than Escherichia that of the coli individual O157:H7, organic strains. acid. Furthermore, D-lac RESUMO.- [Efeito do sobrenadante de isolados de Lac- isolados de Lactobacillus, incluindo L. casei subsp. pseudo- tobacillus sp. sobre Escherichia coli O157:H7 reforça o plantarum, L. plantarum L. reuteri e L. delbrueckii subsp. del- papel da produção de ácidos orgânicos como fator de brueckii, sobre Escherichia coli amostra O157:H7. Os efeitos controle patogênico.] Muitas tentativas têm sido feitas inibidores de culturas puras e de dois “pools” de cultura de para se estabelecer o controle de patógenos de origem ali- Lactobacillus sobre o crescimento da bactéria foram avalia- mentar através do uso de estirpes de Lactobacillus e dos dos através do método de inibição em ágar e através do mo- seus produtos de metabolismo, com sucesso sendo sucedi- nitoramento da turbidez da cultura bacteriana. A atividade do em várias situações. O objetivo deste trabalho foi investi- Lactobacillus reuteri e gar o efeito antagônico do sobrenadante de culturas de oito Lactobacillus delbrueckii subsp. delbrueckii e para o “pool” deantimicrobiana bactérias acido-láctica. foi confirmada O sobrenadante para neutralizado do 1 Received on January 13, 2015. “pool” de Lactobacillus exerceu uma atividade antimicro- Accepted for publication on April 21, 2015. biana mais elevada do que aquela das estirpes individuais. 2 - Além disso, ácido D-láctico e ácido acético foram produzi- de de São Paulo (USP), Área I, Estrada Municipal do Campinho s/n, Lorena, dos durante o crescimento dos Lactobacillus estudados. SP 12.602-810,Departamento Brazil de Biotecnologia, Faculdade de Engenharia, Universida 3 - TERMOS DE INDEXAÇÃO: Lactobacillus, antagonismo, Escherichia ques de Paiva 87, São Paulo, SP 05508-270, Brazil. *Corresponding author: coli O157:H7, ácido orgânico. [email protected] Departamento de Patologia, FMVZ-USP, Avenida Prof. Dr. Orlando Mar 4 INTRODUCTION Universitaria, San Lorenzo, Paraguay. 5 Facultad de Quimica, Universidad National de Asunción, Barrio Villa Escherichia coli O157:H7 represents one of the most impor- de Viçosa, Av. Peter Henry Rolfs s/n, Campus Universitário, Viçosa, MG tant enteropathogenic bacteria; it is responsible for nume- 36570-000, Departamento Brazil. de Tecnologia de Alimentos, Universidade Federal rous reports of diarrhea is transmitted through food, water 353 354 Larissa B. Poppi et al. and the environment, affecting mainly infants and immu- of toxic anions. The decrease in the cell’s internal pH affects nosuppressed adults, all over the world (Monteiro-Neto et - E. coli sipates the proton-motive force, reducing cellular energy O157:H7 is attributed to the production of potent entero- the influx of protons through the cell membrane, which dis- toxins,al. 1997, the Fábrega Shiga-like et al. toxins 2002). (Stx1 The and pathogenicity Stx2, also called of ve- rocytotoxins), that directly affect the activity of cells in the (ATP)Several and affectingin vitro and substrate in vivo studiesuptake indemonstrated the cell (Axe the & Bai an- intestinal wall, resulting in hemorrhage and thousands of tagonismley 1995, Diez-Gonzalezof numerous strains & Russell of Lactobacillus 1997). , including L. deaths annually (Kudva et al. 1996, Cantarelli et al. 2000, delbrueckii var delbrueckii, L. plantarum, L. acidophilus, L. Garcia et al. 2010). Many different types of food were iden- reuteri and L. casei, against a variety of pathogens (Poppi et Escheri- chia coli (STEC), including raw and undercooked foodstuffs Jin et al. 1996). In spite of many detailed studies concer- (Garciatified as etpotential al. 2010). sources The ofnatural Shiga-toxin-producing hosts of Escherichia coli ningal. 2008, the Servinantagonistic & Coconnier effects 2003,of these Kalantzopoulos bacteria on patho 1997,- O157:H7 are wildlife and farm ruminants, mainly cattle and gens, there is still a need for new bacterial strains with an- swine. In the state of Rio de Janeiro (Brazil), studies con- ducted by Cerqueira et al (1999) reported the presence of In vitro screening STEC in 71 % of the fecal samples of healthy cattle from dai- methodstimicrobial such properties as agar forspotting clinical and and the commercial monitoring benefits of tur- bidity(Chaucheyras-Durand represent a fast &and Durand effective 2010). tool for this purpose. report concerning the isolation of STEC from the intestines Therefore, it is desirable to use these methods to select pro- ofry farms,dairy and beef beef farms cattle and inslaughterhouses. Brazil, although This several was thestudies first mising strains of Lactobacillus for the development of new had already reported the presence of other enteropathoge- probiotic preparations at the industrial scale. nic strains in the food industry (Cerqueira et al. 1999). The main objective of this work was to evaluate the in One approach that led to the reduction and, in a number vitro performance of eight strains of Lactobacillus isolated of cases, the elimination of intestinal pathogenic bacteria from poultry litter with respect to their inhibitory effect on in humans and animals includes the ingestion of probiotics the growth of Escherichia coli O157:H7. 2001). Probiotics are live microorganisms that, when ad- MATERIALS AND METHODS in the diary diet (Guarner & Schaafsma 1998, Gopal et al. Lactobacillus isolates and Escherichia coli strain O157:H7 on the host by altering indigenous microbiota and pre- Eight isolates of Lactobacillus, previously isolated from poul- ministered in adequate amounts, confer beneficial effects try litter (Paço et al. 2003), were selected to study their antago- (LAB) with probiotic properties, such as Bifidobacterium nistic effects on an Escherichia coli O157:H7 strain that was kin- spp.venting and infectionsLactobacillus (FAO/WHO spp. were 2001). used toLactic prevent acid somebacteria in- dly provided by Dr. Isabel Scaletsky (Department of Microbiology, testinal pathogenic infections and to stimulate the host’s São Paulo, Brazil). The bacterial isolates subsp. immune system in both humans and animals (Perdigón et L. casei pseudo- plantarumImmunology (isolates and Parasitology, 30b and 30c), Federal L. plantarum University of São Paulo, 22c and 41b), L. reuteri (isolates 18fa and 19fa) and L. delbrueckii documented that Lactobacillus spp. with probiotic proper- subsp. delbrueckii (isolates 11fb,- tiesal. 1999, prevent Fang the et growthal. 2000, and Nakazato toxin production et al. 2011). of Itbacteria is well tory of Avian Diseases at the School of Veterinary Medicine and such as Campylobacter jejuni, Listeria monocytogenes, He- Animal Science of (isolatethe University 17fb) were of São obtained Paulo, Brazil. from the The Labora Lacto- licobacter pylori, Salmonella, Shigella and Escherichia coli bacillus isolates were maintained at 4°C in MRS (Manosa-Rogosa and Sharpe) agar slant. The pathogenic strain of Escherichia coli 2003, Poppi et al. 2008, Scapin et al. 2013). 0157:H7 was grown in BHI broth (Difco, Sparks, MD, USA) under (JinThe et al. antagonist 1996, Kalantzopoulos activity of probiotics 1997, Servin on pathogenic & Coconnier bac- aerobic conditions at 37°C for 18h. teria could be associated with the competition for nutrients The physiological characteristics and purity of the Lactoba- and sites of adhesion in the mucosa of the small intestine cillus isolates were analyzed by observation of their morphological characteristics using a light microscope, Gram staining, a catalase and the production of carbon dioxide, hydrogen peroxide test, a motility test and their ability to ferment various substra- tes. Sugar and sugar- alcohol assimilation tests were
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