Chronic pneumonia in calves after experimental infection with <it>Mycoplasma bovis </it>strain 1067: Characterization of lung pathology, persistence of variable surface protein antigens and local immune response
<p>Abstract</p> <p>Background</p> <p><it>Mycoplasma bovis </it>is associated with pneumonia in calves characterized by the development of chronic caseonecrotic lesions with the agent persisting within the lesion. The purposes of this study were to characteri...
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| Format: | Article |
| Language: | English |
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BMC
2012-02-01
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| Series: | Acta Veterinaria Scandinavica |
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| Online Access: | http://www.actavetscand.com/content/54/1/9 |
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| author | Hermeyer Kathrin Buchenau Inka Thomasmeyer Anne Baum Berit Spergser Joachim Rosengarten Renate Hewicker-Trautwein Marion |
| author_facet | Hermeyer Kathrin Buchenau Inka Thomasmeyer Anne Baum Berit Spergser Joachim Rosengarten Renate Hewicker-Trautwein Marion |
| author_sort | Hermeyer Kathrin |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p><it>Mycoplasma bovis </it>is associated with pneumonia in calves characterized by the development of chronic caseonecrotic lesions with the agent persisting within the lesion. The purposes of this study were to characterize the morphology of lung lesions, examine the presence of <it>M. bovis </it>variable surface protein (Vsp) antigens and study the local immune responses in calves after infection with <it>M. bovis </it>strain 1067.</p> <p>Methods</p> <p>Lung tissue samples from eight calves euthanased three weeks after experimental infection with <it>M. bovis </it>were examined by bacteriology and pathology. Lung lesions were evaluated by immunohistochemical (IHC) staining for wide spectrum cytokeratin and for <it>M. bovis </it>Vsp antigens and pMB67 antigen. IHC identification and quantitative evaluation of CD4<sup>+ </sup>and CD8<sup>+ </sup>T lymphocytes and immunoglobulin (IgG1, IgG2, IgM, IgA)-containing plasma cells was performed. Additionally, expression of major histocompatibility complex class II (MHC class II) was studied by IHC.</p> <p>Results</p> <p>Suppurative pneumonic lesions were found in all calves. In two calves with caseonecrotic pneumonia, necrotic foci were surrounded by epithelial cells resembling bronchial or bronchiolar epithelium. In all calves, <it>M. bovis </it>Vsp antigens were constantly present in the cytoplasm of macrophages and were also present extracellularly at the periphery of necrotic foci. There was a considerable increase in numbers of IgG1- and IgG2-positive plasma cells among which IgG1-containing plasma cells clearly predominated. Statistical evaluation of the numbers of CD4<sup>+ </sup>and CD8<sup>+ </sup>T cells, however, did not reveal statistically significant differences between inoculated and control calves. In <it>M. bovis </it>infected calves, hyperplasia of bronchus-associated lymphoid tissue (BALT) was characterized by strong MHC class II expression of lymphoid cells, but only few of the macrophages demarcating the caseonecrotic foci were positive for MHC class II.</p> <p>Conclusions</p> <p>The results from this study show that infection of calves with <it>M. bovis </it>results in various lung lesions including caseonecrotic pneumonia originating from bronchioli and bronchi. There is long-term persistence of <it>M. bovis </it>as demonstrated by bacteriology and immunohistochemistry for <it>M. bovis </it>antigens, i.e. Vsp antigens and pMB67. The persistence of the pathogen and its ability to evade the specific immune response may in part result from local downregulation of antigen presenting mechanisms and an ineffective humoral immune response with prevalence of IgG1 antibodies that, compared to IgG2 antibodies, are poor opsonins.</p> |
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| id | doaj.art-692c5c3dd2b14337bd1575c31e82e9e3 |
| institution | Directory Open Access Journal |
| issn | 1751-0147 |
| language | English |
| last_indexed | 2024-04-12T16:12:39Z |
| publishDate | 2012-02-01 |
| publisher | BMC |
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| series | Acta Veterinaria Scandinavica |
| spelling | doaj.art-692c5c3dd2b14337bd1575c31e82e9e32022-12-22T03:25:50ZengBMCActa Veterinaria Scandinavica1751-01472012-02-01541910.1186/1751-0147-54-9Chronic pneumonia in calves after experimental infection with <it>Mycoplasma bovis </it>strain 1067: Characterization of lung pathology, persistence of variable surface protein antigens and local immune responseHermeyer KathrinBuchenau InkaThomasmeyer AnneBaum BeritSpergser JoachimRosengarten RenateHewicker-Trautwein Marion<p>Abstract</p> <p>Background</p> <p><it>Mycoplasma bovis </it>is associated with pneumonia in calves characterized by the development of chronic caseonecrotic lesions with the agent persisting within the lesion. The purposes of this study were to characterize the morphology of lung lesions, examine the presence of <it>M. bovis </it>variable surface protein (Vsp) antigens and study the local immune responses in calves after infection with <it>M. bovis </it>strain 1067.</p> <p>Methods</p> <p>Lung tissue samples from eight calves euthanased three weeks after experimental infection with <it>M. bovis </it>were examined by bacteriology and pathology. Lung lesions were evaluated by immunohistochemical (IHC) staining for wide spectrum cytokeratin and for <it>M. bovis </it>Vsp antigens and pMB67 antigen. IHC identification and quantitative evaluation of CD4<sup>+ </sup>and CD8<sup>+ </sup>T lymphocytes and immunoglobulin (IgG1, IgG2, IgM, IgA)-containing plasma cells was performed. Additionally, expression of major histocompatibility complex class II (MHC class II) was studied by IHC.</p> <p>Results</p> <p>Suppurative pneumonic lesions were found in all calves. In two calves with caseonecrotic pneumonia, necrotic foci were surrounded by epithelial cells resembling bronchial or bronchiolar epithelium. In all calves, <it>M. bovis </it>Vsp antigens were constantly present in the cytoplasm of macrophages and were also present extracellularly at the periphery of necrotic foci. There was a considerable increase in numbers of IgG1- and IgG2-positive plasma cells among which IgG1-containing plasma cells clearly predominated. Statistical evaluation of the numbers of CD4<sup>+ </sup>and CD8<sup>+ </sup>T cells, however, did not reveal statistically significant differences between inoculated and control calves. In <it>M. bovis </it>infected calves, hyperplasia of bronchus-associated lymphoid tissue (BALT) was characterized by strong MHC class II expression of lymphoid cells, but only few of the macrophages demarcating the caseonecrotic foci were positive for MHC class II.</p> <p>Conclusions</p> <p>The results from this study show that infection of calves with <it>M. bovis </it>results in various lung lesions including caseonecrotic pneumonia originating from bronchioli and bronchi. There is long-term persistence of <it>M. bovis </it>as demonstrated by bacteriology and immunohistochemistry for <it>M. bovis </it>antigens, i.e. Vsp antigens and pMB67. The persistence of the pathogen and its ability to evade the specific immune response may in part result from local downregulation of antigen presenting mechanisms and an ineffective humoral immune response with prevalence of IgG1 antibodies that, compared to IgG2 antibodies, are poor opsonins.</p>http://www.actavetscand.com/content/54/1/9Cattle, <it>Mycoplasma bovis</it>pneumoniaimmunoglobulinsCD4<sup>+ </sup>T cellsCD8<sup>+ </sup>cellsMHC class II |
| spellingShingle | Hermeyer Kathrin Buchenau Inka Thomasmeyer Anne Baum Berit Spergser Joachim Rosengarten Renate Hewicker-Trautwein Marion Chronic pneumonia in calves after experimental infection with <it>Mycoplasma bovis </it>strain 1067: Characterization of lung pathology, persistence of variable surface protein antigens and local immune response Acta Veterinaria Scandinavica Cattle, <it>Mycoplasma bovis</it> pneumonia immunoglobulins CD4<sup>+ </sup>T cells CD8<sup>+ </sup>cells MHC class II |
| title | Chronic pneumonia in calves after experimental infection with <it>Mycoplasma bovis </it>strain 1067: Characterization of lung pathology, persistence of variable surface protein antigens and local immune response |
| title_full | Chronic pneumonia in calves after experimental infection with <it>Mycoplasma bovis </it>strain 1067: Characterization of lung pathology, persistence of variable surface protein antigens and local immune response |
| title_fullStr | Chronic pneumonia in calves after experimental infection with <it>Mycoplasma bovis </it>strain 1067: Characterization of lung pathology, persistence of variable surface protein antigens and local immune response |
| title_full_unstemmed | Chronic pneumonia in calves after experimental infection with <it>Mycoplasma bovis </it>strain 1067: Characterization of lung pathology, persistence of variable surface protein antigens and local immune response |
| title_short | Chronic pneumonia in calves after experimental infection with <it>Mycoplasma bovis </it>strain 1067: Characterization of lung pathology, persistence of variable surface protein antigens and local immune response |
| title_sort | chronic pneumonia in calves after experimental infection with it mycoplasma bovis it strain 1067 characterization of lung pathology persistence of variable surface protein antigens and local immune response |
| topic | Cattle, <it>Mycoplasma bovis</it> pneumonia immunoglobulins CD4<sup>+ </sup>T cells CD8<sup>+ </sup>cells MHC class II |
| url | http://www.actavetscand.com/content/54/1/9 |
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