ICOS:ICOS-ligand interaction is required for type 2 innate lymphoid cell function, homeostasis, and induction of airway hyperreactivity.

Citation:

Maazi H, Patel N, Sankaranarayanan I, Suzuki Y, Rigas D, Soroosh P, Freeman GJ, Sharpe AH, Akbari O. ICOS:ICOS-ligand interaction is required for type 2 innate lymphoid cell function, homeostasis, and induction of airway hyperreactivity. Immunity. 2015;42 (3) :538-51.

Date Published:

2015 Mar 17

Abstract:

Allergic asthma is caused by Th2-cell-type cytokines in response to allergen exposure. Type 2 innate lymphoid cells (ILC2s) are a newly identified subset of immune cells that, along with Th2 cells, contribute to the pathogenesis of asthma by producing copious amounts of IL-5 and IL-13, which cause eosinophilia and airway hyperreactivity (AHR), a cardinal feature of asthma. ILC2s express ICOS, a T cell costimulatory molecule with a currently unknown function. Here we showed that a lack of ICOS on murine ILC2s and blocking the ICOS:ICOS-ligand interaction in human ILC2s reduced AHR and lung inflammation. ILC2s expressed both ICOS and ICOS-ligand, and the ICOS:ICOS-ligand interaction promoted cytokine production and survival in ILC2s through STAT5 signaling. Thus, ICOS:ICOS-ligand signaling pathway is critically involved in ILC2 function and homeostasis.