Iron acquisition pathways and colonization of the inflamed intestine by Salmonella enterica serovar Typhimurium.

Salmonella enterica serotype Typhimurium is able to expand in the lumen of the inflamed intestine through mechanisms that have not been fully resolved. Here we utilized streptomycin-pretreated mice and dextran sodium sulfate (DSS)-treated mice to investigate how pathways for S. Typhimurium iron acquisition contribute to pathogen expansion in the inflamed intestine. Competitive infection with an iron uptake-proficient S. Typhimurium strain and mutant strains lacking tonB feoB, feoB, tonB or iroN in streptomycin pretreated mice demonstrated that ferric iron uptake requiring IroN and TonB conferred a fitness advantage during growth in the inflamed intestine. However, the fitness advantage conferred by ferrous iron uptake mechanisms was independent of inflammation and was only apparent in models where the normal microbiota composition had been disrupted by antibiotic treatment

Iron acquisition pathways and colonization of the inflamed intestine by Salmonella enterica serovar Typhimurium.

Salmonella enterica serotype Typhimurium is able to expand in the lumen of the inflamed intestine through mechanisms that have not been fully resolved. Here we utilized streptomycin-pretreated mice and dextran sodium sulfate (DSS)-treated mice to investigate how pathways for S. Typhimurium iron acquisition contribute to pathogen expansion in the inflamed intestine. Competitive infection with an iron uptake-proficient S. Typhimurium strain and mutant strains lacking tonB feoB, feoB, tonB or iroN in streptomycin pretreated mice demonstrated that ferric iron uptake requiring IroN and TonB conferred a fitness advantage during growth in the inflamed intestine. However, the fitness advantage conferred by ferrous iron uptake mechanisms was independent of inflammation and was only apparent in models where the normal microbiota composition had been disrupted by antibiotic treatment

Encapsulated Brucella ovis Lacking a Putative ATP-Binding Cassette Transporter (ΔabcBA) Protects against Wild Type Brucella ovis in Rams.

Submitted by Nuzia Santos ([email protected]) on 2016-04-05T16:46:49Z No. of bitstreams: 1 Encapsulated Brucella(...) Transporte.pdf: 3817674 bytes, checksum: fc75361cde3ac21b6b485230614c7a04 (MD5)Approved for entry into archive by Nuzia Santos ([email protected]) on 2016-04-05T16:56:00Z (GMT) No. of bitstreams: 1 Encapsulated Brucella(...) Transporte.pdf: 3817674 bytes, checksum: fc75361cde3ac21b6b485230614c7a04 (MD5)Made available in DSpace on 2016-04-05T16:56:01Z (GMT). No. of bitstreams: 1 Encapsulated Brucella(...) Transporte.pdf: 3817674 bytes, checksum: fc75361cde3ac21b6b485230614c7a04 (MD5) Previous issue date: 2015Universidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Departamento de Patologia Geral. Belo Horizonte, MG, BrazilUniversidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Departamento de Patologia Geral. Belo Horizonte, MG, BrazilUniversidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Departamento de Patologia Geral. Belo Horizonte, MG, BrazilUniversidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Departamento de Patologia Geral. Belo Horizonte, MG, BrazilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilUniversidade Estadual do Maranhão. Departamento de Patologia. São Luís, MA, BrasilFundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, BrasilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilFundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, BrasilEmpresa Brasileira de Agropecuária. Juiz de Fora, MG, BrasilUniversidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Departamento de Patologia Geral. Belo Horizonte, MG, BrazilUniversidade Federal de Minas Gerais. Escola de Veterinária. Departamento de Clínica e Cirurgia Veterinárias. Belo Horizonte, MG, BrasilThis study aimed to evaluate protection induced by the vaccine candidate B. ovis ΔabcBA against experimental challenge with wild type B. ovis in rams. Rams were subcutaneously immunized with B. ovis ΔabcBA encapsulated with sterile alginate or with the non encapsulated vaccine strain. Serum, urine, and semen samples were collected during two months after immunization. The rams were then challenged with wild type B. ovis (ATCC25840), and the results were compared to non immunized and experimentally challenged rams. Immunization, particularly with encapsulated B. ovis ΔabcBA, prevented infection, secretion of wild type B. ovis in the semen and urine, shedding of neutrophils in the semen, and the development of clinical changes, gross and microscopic lesions induced by the wild type B. ovis reference strain. Collectively, our data indicates that the B. ovis ΔabcBA strain is an exceptionally good vaccine strain for preventing brucellosis caused by B. ovis infection in rams