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Dynamic changes in cellular immune responses in experimental bovine tuberculosis.
Siddhartha N Joardar1, Gulab C Ram, Tapas Goswami
1Section of Immunology, Indian Veterinary Research Institute, Izatnagar, India. sid_nj@indiatimes.com
Summary
Investigating bovine tuberculosis, this study tracked T-cell responses and immune cells in cattle post-Mycobacterium bovis AN5 inoculation. Key findings reveal distinct T-cell populations and cytokine patterns correlating with disease progression.
Area of Science:
- Veterinary Immunology
- Infectious Diseases
- Mycobacterial Research
Background:
- Cattle serve as a natural model for studying tuberculosis (TB) pathogenesis.
- Understanding T-cell responses in cattle is crucial for TB research.
- Investigating host immune responses aids in understanding disease progression and antigen recognition.
Purpose of the Study:
- To characterize immune-effector cells and cytokines in cattle after Mycobacterium bovis AN5 sensitization.
- To assess T-cell responses, including lymphoproliferation and cytotoxic T lymphocyte (CTL) activity, over time.
- To identify T-cell target antigens during different stages of bovine tuberculosis.
Main Methods:
- Monitoring cattle from day 0 to 45 weeks post-inoculation (PI) with Mycobacterium bovis AN5.
- Assessing in vitro lymphoproliferation, CTL responses, and cytokine (IL-2, IFN-gamma) release from peripheral blood mononuclear cells (PBMCs).
- Utilizing T-cell immunoblotting to identify T-cell target antigens at various post-sensitization stages.
Main Results:
- Cell-mediated immune (CMI) responses peaked between weeks 9 and 20 PI.
- Observed a sequential dominance of gd+, CD4+, and CD8+ T-cells.
- Identified immunodominant polypeptides (72-74, 30-32, 25, 22-24 kDa) stimulating lymphoproliferation and CTL responses.
- Cytokine (IL-2, IFN-gamma) levels showed a distinct trend, peaking between weeks 9 and 20 PI.
Conclusions:
- The study elucidated fundamental aspects of the immune-effector mechanisms in bovine tuberculosis.
- Characterized the dynamic changes in T-cell populations and cytokine profiles during M. bovis infection in cattle.
- Provided insights into specific mycobacterial antigens recognized during the immune response.