Effect of cyclosporin A on the ontogeny of different T cell sublineages in chickens
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Updated: Aug 12, 2026
Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
Published on: April 16, 2015
Abstract:
We have used a panel of murine mAb against chicken TCR and associated molecules to study the effect of cyclosporin A (CsA) on the ontogeny of the different sublineages of T cells. After injection of CsA (20 mg/kg/day from day 0 to 20) we observed a significant suppression of the normal maturation of the TCR2 (alpha beta TCR) cells in their transition from cortical CD4+CD8+ thymocytes to the mature single positive cells in the thymus medulla. The TCR3 subpopulation, a distinct form of alpha beta-like TCR in chickens, was inhibited from initially developing within the cortex by CsA, indicating that the TCR3 subpopulation is functionally distinct from the TCR2+ cells. In contrast, the maturation and peripheral emigration of TCR1 (gamma delta TCR) cells was unaffected by CsA treatment. Mature splenic T cells sorted for either TCR1+ or TCR2+ subsets were equally sensitive to CsA blockade of Con A-stimulated mitogenesis, indicating that there is no inherent difference in CsA sensitivity between these sublineages. Furthermore, no difference was detected in the expression of class II MHC Ag in thymi of birds treated with olive oil vs CsA. Inasmuch as the mechanism of CsA action appears to involve inhibition of TCR initiated signal transduction for lymphokine synthesis, these data indicate that a similar signaling is involved in thymic repertoire selection for TCR2. The lack of an effect on TCR1 cell maturation suggests that the TCR1 repertoire may not undergo selection in the thymus as do TCR2+ cells.
Insights
Cyclosporin A (CsA) suppresses the maturation of chicken alpha beta T cells (TCR2) but not gamma delta T cells (TCR1). This suggests distinct thymic selection processes for different T cell receptor types.
Area of Science:
- Immunology
- Developmental Biology
- T Cell Biology
Background:
- Cyclosporin A (CsA) is an immunosuppressant drug.
- T cell development involves distinct subpopulations expressing different T cell receptors (TCRs).
- Understanding T cell ontogeny is crucial for immunology and transplantation.
Purpose of the Study:
- To investigate the effect of CsA on chicken T cell sublineage maturation.
- To determine if different TCR subpopulations (TCR1, TCR2, TCR3) have varying sensitivities to CsA during development.
- To explore the role of TCR signaling in thymic selection.
Main Methods:
- Murine monoclonal antibodies against chicken TCR and associated molecules were used.
- Chickens were treated with CsA during the early stages of T cell development.
- Flow cytometry and cell sorting were employed to analyze T cell subpopulations.
- Mitogenesis assays were performed on sorted T cell subsets.
Main Results:
- CsA significantly suppressed the maturation of TCR2 (alpha beta TCR) cells in the thymus.
- CsA inhibited the cortical development of TCR3, indicating functional distinctness from TCR2 cells.
- Maturation and emigration of TCR1 (gamma delta TCR) cells were unaffected by CsA.
- Mature TCR1 and TCR2 splenic T cells showed equal sensitivity to CsA in mitogenesis assays.
- No difference in MHC class II expression was observed between CsA-treated and control groups.
Conclusions:
- CsA's mechanism, involving TCR-initiated signal transduction, appears critical for TCR2 thymic repertoire selection.
- The maturation of TCR1 cells is not affected by CsA, suggesting it may not undergo the same thymic selection process as TCR2 cells.
- These findings highlight distinct developmental pathways and selection mechanisms for different T cell receptor sublineages in chickens.
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