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Ito H, Takahashi S, Asai T, Tamura Y, Yamamoto K. Isolation and molecular characterization of a urease-negative Actinobacillus pleuropneumoniae mutant. J Vet Diagn Invest 2017; 30:172-174. [PMID: 29145759 DOI: 10.1177/1040638717742436] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
An atypical urease-negative mutant of Actinobacillus pleuropneumoniae serovar 2 was isolated in Japan. Nucleotide sequence analysis of the urease gene cluster revealed that the insertion of a short DNA sequence into the cbiM gene was responsible for the urease-negative activity of the mutant. Veterinary diagnostic laboratories should be watchful for the presence of aberrant urease-negative A. pleuropneumoniae isolates.
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Affiliation(s)
- Hiroya Ito
- The National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan (Ito).,Zen-Noh Institute of Animal Health, Sakura, Chiba, Japan (Takahashi).,Gifu University, Gifu, Gifu, Japan (Asai).,Rakuno Gakuen University, Ebetsu, Hokkaido, Japan (Tamura).,Tokyo University of Agriculture, Tokyo, Japan (Yamamoto)
| | - Sayaka Takahashi
- The National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan (Ito).,Zen-Noh Institute of Animal Health, Sakura, Chiba, Japan (Takahashi).,Gifu University, Gifu, Gifu, Japan (Asai).,Rakuno Gakuen University, Ebetsu, Hokkaido, Japan (Tamura).,Tokyo University of Agriculture, Tokyo, Japan (Yamamoto)
| | - Tetsuo Asai
- The National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan (Ito).,Zen-Noh Institute of Animal Health, Sakura, Chiba, Japan (Takahashi).,Gifu University, Gifu, Gifu, Japan (Asai).,Rakuno Gakuen University, Ebetsu, Hokkaido, Japan (Tamura).,Tokyo University of Agriculture, Tokyo, Japan (Yamamoto)
| | - Yutaka Tamura
- The National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan (Ito).,Zen-Noh Institute of Animal Health, Sakura, Chiba, Japan (Takahashi).,Gifu University, Gifu, Gifu, Japan (Asai).,Rakuno Gakuen University, Ebetsu, Hokkaido, Japan (Tamura).,Tokyo University of Agriculture, Tokyo, Japan (Yamamoto)
| | - Koshi Yamamoto
- The National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan (Ito).,Zen-Noh Institute of Animal Health, Sakura, Chiba, Japan (Takahashi).,Gifu University, Gifu, Gifu, Japan (Asai).,Rakuno Gakuen University, Ebetsu, Hokkaido, Japan (Tamura).,Tokyo University of Agriculture, Tokyo, Japan (Yamamoto)
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Baltes N, Tonpitak W, Gerlach GF, Hennig-Pauka I, Hoffmann-Moujahid A, Ganter M, Rothkötter HJ. Actinobacillus pleuropneumoniae iron transport and urease activity: effects on bacterial virulence and host immune response. Infect Immun 2001; 69:472-8. [PMID: 11119539 PMCID: PMC97905 DOI: 10.1128/iai.69.1.472-478.2001] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2000] [Accepted: 10/25/2000] [Indexed: 11/20/2022] Open
Abstract
Actinobacillus pleuropneumoniae, a porcine respiratory tract pathogen, has been shown to express transferrin-binding proteins and urease during infection. Both activities have been associated with virulence; however, their functional role for infection has not yet been elucidated. We used two isogenic A. pleuropneumoniae single mutants (DeltaexbB and DeltaureC) and a newly constructed A. pleuropneumoniae double (DeltaureC DeltaexbB) mutant in aerosol infection experiments. Neither the A. pleuropneumoniae DeltaexbB mutant nor the double DeltaureC DeltaexbB mutant was able to colonize sufficiently long to initiate a detectable humoral immune response. These results imply that the ability to utilize transferrin-bound iron is required for multiplication and persistence of A. pleuropneumoniae in the porcine respiratory tract. The A. pleuropneumoniae DeltaureC mutant and the parent strain both caused infections that were indistinguishable from one another in the acute phase of disease; however, 3 weeks postinfection the A. pleuropneumoniae DeltaureC mutant, in contrast to the parent strain, could not be isolated from healthy lung tissue. In addition, the local immune response-as assessed by fluorescence-activated cell sorter and enzyme-linked immunosorbent spot analyses-revealed a significantly higher number of A. pleuropneumoniae-specific B cells in the bronchoalveolar lavage fluid (BALF) of pigs infected with the A. pleuropneumoniae DeltaureC mutant than in the BALF of those infected with the parent strain. These results imply that A. pleuropneumoniae urease activity may cause sufficient impairment of the local immune response to slightly improve the persistence of the urease-positive A. pleuropneumoniae parent strain.
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Affiliation(s)
- N Baltes
- Institut für Mikrobiologie und Tierseuchen, Tieraerztliche Hochschule Hannover, 30173 Hanover, Germany
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