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The expression of Indoleamine 2, 3-dioxygenase (IDO) is reduced in granulomas from BCG vaccinated cattle compared to granulomas from unvaccinated controls after experimental challenge with Mycobacterium bovis.

Authors
  • Garcia-Jimenez, Waldo L1
  • Villarreal-Ramos, Bernardo2
  • Grainger, Duncan1
  • Hewisnon, R Glyn2
  • Vordermeier, Hans M2
  • Salguero, Francisco J3
  • 1 Department of Pathology and Infectious Diseases, School of Veterinary Medicine, University of Surrey, Guildford, Surrey, United Kingdom. , (United Kingdom)
  • 2 TB Research Group, Department of Bacteriology, Animal Health and Veterinary Laboratories Agency, AHVLA-Weybridge, New Haw, Addlestone, Surrey, United Kingdom. , (United Kingdom)
  • 3 Department of Pathology and Infectious Diseases, School of Veterinary Medicine, University of Surrey, Guildford, Surrey, United Kingdom; TB Research Group, Department of Bacteriology, Animal Health and Veterinary Laboratories Agency, AHVLA-Weybridge, New Haw, Addlestone, Surrey, United Kingdom. Electronic address: [email protected] , (United Kingdom)
Type
Published Article
Journal
Veterinary immunology and immunopathology
Publication Date
Sep 01, 2018
Volume
203
Pages
52–56
Identifiers
DOI: 10.1016/j.vetimm.2018.08.002
PMID: 30243373
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Bovine tuberculosis (bTB), mainly caused by Mycobacterium bovis (M. bovis), is a major economic disease of livestock worldwide. Vaccination is considered as a potentially sustainable adjunct to the current control strategy. Cattle vaccination with the live attenuated M. bovis bacillus Calmette-Guerin (BCG) confers variable protection; the reasons for this variability are not understood. Indoleamine 2, 3-dioxygenase (IDO), through the catalysis of tryptophan, is thought to have an immunoregulatory role in the immune response to Mycobacterium tuberculosis (M. tuberculosis). In this work, we used immunohistochemistry and digital image analysis to evaluate the presence of IDO in granulomas at different stages of development in cattle that had been BCG-vaccinated or not and then challenged with M. bovis. Our results show that the expression of IDO in granulomas from non-vaccinated M. bovis challenged animals is higher than in granulomas from BCG-vaccinated M. bovis challenged animals. Thus, it is possible that vaccination with BCG prevents the induction of what are thought to be host immunosuppressive pathways by M. bovis, which contribute to pathology during the disease. Crown Copyright © 2018. Published by Elsevier B.V. All rights reserved.

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