T Cell Mediated Mechanisms in Allergic Asthma

Allergic asthma arises from a dysregulated immune response in which CD4+ T helper 2 (Th2) cells play a central role by secreting interleukins 4, 5 and 13 to drive eosinophilic inflammation, goblet cell hyperplasia and airway hyperresponsiveness. Disruption of the epithelial barrier elicits release of alarmins (TSLP, IL-33 and IL-25) that condition dendritic cells and group 2 innate lymphoid cells to support Th2 polarisation in regional lymph nodes. In certain patients, Th1 and Th17 subsets contribute to neutrophilic or mixed granulocytic endotypes, reflecting the phenotypic heterogeneity of asthma. Tissue-resident memory T cells lodged in the lung parenchyma potentiate rapid recall responses to familiar allergens, while FOXP3+ regulatory T cells enforce peripheral tolerance through inhibitory cytokines such as IL-10 and TGF-β. Cross-talk between T cells and structural elements—particularly airway smooth muscle—amplifies bronchoconstriction and remodelling, with a growing appreciation for the role of auxiliary cytokine receptors in modulating contractile signalling.

Research from Nature Portfolio

Recent studies have identified the interleukin-31 receptor α (IL-31RA) on airway smooth muscle cells as a novel amplifier of cholinergic-induced contraction. Exposure to Th2 cytokines and IFNγ upregulates IL-31RA expression in primary human and murine airway smooth muscle, enhancing muscarinic receptor signalling, intracellular calcium mobilisation and myosin light chain phosphorylation. Genetic ablation of IL-31RA in murine models attenuates airway hyperresponsiveness without altering eosinophilic inflammation or goblet cell metaplasia, thereby decoupling bronchomotor tone from classical type 2 inflammatory pathways and highlighting a potential therapeutic axis distinct from conventional cytokine blockade.

T Cell Mediated Mechanisms in Allergic Asthma publication trend

The graph below shows the total number of articles in t cell mediated mechanisms in allergic asthma across all publications each year (not limited to Nature Index journals).

Technical terms

CD4+ T helper 2 (Th2) cells: A subset of CD4+ T lymphocytes that secrete IL-4, IL-5 and IL-13 to promote eosinophilic inflammation and IgE production.

Airway hyperresponsiveness (AHR): Exaggerated bronchoconstrictive response of airway smooth muscle to stimuli such as methacholine or allergen.

Alarmins: Epithelial-derived cytokines (TSLP, IL-33, IL-25) released upon barrier disruption to initiate type 2 immunity.

Tissue-resident memory T cells (TRM): Long-lived T cells embedded in lung tissue that provide rapid recall responses to previously encountered allergens.

Regulatory T cells (Tregs): FOXP3+ CD4+ T cells that suppress excessive immune reactions via inhibitory cytokines such as IL-10 and TGF-β.

Interleukin-31 receptor α (IL-31RA): A receptor on airway smooth muscle cells that modulates muscarinic signalling and contributes to bronchomotor tone in asthma.

References

1. Interleukin 31 receptor α promotes smooth muscle cell contraction and airway hyperresponsiveness in asthma. Nature Communications (2023).
2. Distinct spatial and temporal roles for Th1, Th2, and Th17 cells in asthma. Frontiers in Immunology (2022).
3. CD4+ Th2 cells are directly regulated by IL-10 during allergic airway inflammation. Mucosal Immunology (2016).
4. Cellular and molecular mechanisms of allergic asthma. Molecular Aspects of Medicine (2021).