Targeting T cells for asthma

The type 2 T-helper (Th2) lymphocyte can be regarded as an important target cell for the treatment of allergic asthma as it plays a crucial role in the initiation, progression and persistence of disease. Several strategies to target Th2 cells can be envisioned. Drugs that prevent Th2-cells from migrating into the lung tissue, such as antibodies to the chemokine receptor CCR4 and inhibitors of the adhesion molecule VLA-4, are promising for the treatment of asthma. To inhibit Th2-cell activation, novel asthma drugs that act on Th2-selective transciption factors such as GATA3 are being developed. Although initial strategies aimed to block the action of Th2-derived cytokines, the generation of counter-regulatory Th1 lymphocytes and regulatory T cells is currently being explored.