Antagonistic Effect of Bacteria Isolated from the Digestive Tract of Lutzomyia evansi against Promastigotes of Leishmania infantum, Antimicrobial Activities and Susceptibility to Antibiotics  

作　　者：Rafael J. Vivero Gómez Gloria E. Cadavid Restrepo Claudia X. Moreno Herrera Victoria Ospina Sandra I. Uribe Sara M. Robledo Rafael J. Vivero Gómez;Gloria E. Cadavid Restrepo;Claudia X. Moreno Herrera;Victoria Ospina;Sandra I. Uribe;Sara M. Robledo(PECET-Medical Research Institute, University of Antioquia, Medellin, Colombia;Molecular Systematics Group, National University of Colombia, Medellin, Colombia;Microbiodiversity and Bioprospection Research Group, Cellular and Molecular Biology Laboratory, National University of Colombia, Medellin, Colombia)

机构地区：[1]PECET-Medical Research Institute, University of Antioquia, Medellin, Colombia [2]Molecular Systematics Group, National University of Colombia, Medellin, Colombia [3]Microbiodiversity and Bioprospection Research Group, Cellular and Molecular Biology Laboratory, National University of Colombia, Medellin, Colombia

出　　处：《Advances in Microbiology》2016年第10期760-775,共16页微生物学（英文）

摘　　要：Lutzomyia evansi is a phlebotomine insect endemic to Colombia’s Caribbean coast and is considered the main vector of visceral and cutaneous leishmaniasis in the region. Specific studies of the direct effects generated by bacteria in the digestive tract of the insect vectors, under Leishmania infantum using in vitro models, represent a novel alternative as a control strategy for the transmission of leishmaniasis and also provide the opportunity to detect natural products or antimicrobial peptides with different biological activities. In this study, we evaluate the leishmanicidal and antimicrobial activities of Pantoea ananatis, Ochrobactrum anthropi and Enterobacter cloacae, isolated from the digestive tract of Lutzomyia evansi and the susceptibility of these bacteria to commonly used antibiotics. The antagonistic effect of Pantoea ananatis, Ochrobactrum anthropi and Enterobacter cloacae was evaluated against six species of human pathogenic bacteria and against stationary (Metacyclic-like) and exponential promastigotes (Procyclic-like) of Leishmania infantum (BCN-GFP strain) by co-culture assays for 24 hours. The activity of the bacterial isolates on Leishmania infantum promastigotes was quantified by flow cytometry. The susceptibility of the bacterial strains to clinically used antibiotics was analyzed by antibiogram. The highest percentage of inhibition was observed against exponential promastigotes with bacterial concentrations of 10⁸ CFU/ml of Enterobacter cloacae (77.29% ± 0.6%) and Pantoea ananatis (70.17% ± 1.1%). The extracts produced by three bacterial isolates showed similar biological activity (13 mm - 22 mm inhibition halos) against all tested bacteria;however, significant differences were observed with respect to gram-positive bacteria (P < 0.003557). The most active antibacterial activity was displayed against the pathogenic bacteria Bacillus cereus. Ochrobactrum anthropi was the isolate with the highest number of antibiotic resistance patterns while Pantoea ananatis and Enterobacter cLutzomyia evansi is a phlebotomine insect endemic to Colombia’s Caribbean coast and is considered the main vector of visceral and cutaneous leishmaniasis in the region. Specific studies of the direct effects generated by bacteria in the digestive tract of the insect vectors, under Leishmania infantum using in vitro models, represent a novel alternative as a control strategy for the transmission of leishmaniasis and also provide the opportunity to detect natural products or antimicrobial peptides with different biological activities. In this study, we evaluate the leishmanicidal and antimicrobial activities of Pantoea ananatis, Ochrobactrum anthropi and Enterobacter cloacae, isolated from the digestive tract of Lutzomyia evansi and the susceptibility of these bacteria to commonly used antibiotics. The antagonistic effect of Pantoea ananatis, Ochrobactrum anthropi and Enterobacter cloacae was evaluated against six species of human pathogenic bacteria and against stationary (Metacyclic-like) and exponential promastigotes (Procyclic-like) of Leishmania infantum (BCN-GFP strain) by co-culture assays for 24 hours. The activity of the bacterial isolates on Leishmania infantum promastigotes was quantified by flow cytometry. The susceptibility of the bacterial strains to clinically used antibiotics was analyzed by antibiogram. The highest percentage of inhibition was observed against exponential promastigotes with bacterial concentrations of 10⁸ CFU/ml of Enterobacter cloacae (77.29% ± 0.6%) and Pantoea ananatis (70.17% ± 1.1%). The extracts produced by three bacterial isolates showed similar biological activity (13 mm - 22 mm inhibition halos) against all tested bacteria;however, significant differences were observed with respect to gram-positive bacteria (P < 0.003557). The most active antibacterial activity was displayed against the pathogenic bacteria Bacillus cereus. Ochrobactrum anthropi was the isolate with the highest number of antibiotic resistance patterns while Pantoea ananatis and Enterobacter c

关 键 词：Intestinal Microbiota Leishmanicidal Activity Antimicrobial Activity Antibiotic Susceptibility 

分 类 号：R53[医药卫生—内科学]