Lentiviral-mediated GATA-3 RNAi decreases allergic airway inflammation and hyperresponsiveness.

GATA-3 is the key transcriptional factor for Th2 commitment in T cells and is strongly associated with asthma and allergic disease. We studied the silencing of the GATA-3 gene expression using RNA interference (RNAi) delivered by a lentiviral vector, to evaluate the therapeutic role of GATA-3 short hairpin RNAs (shRNAs) in a murine model of asthma. Mice were sensitized with OVA and instilled intratracheally (IT) with GATA-3 shRNAs lentiviral vector (Lenti-si-GATA-3) once, 48 hours before challenge. After three challenges with the OVA antigen, the mice were assessed for airway hyperresponsiveness (AHR) and inflammation. With infection of Lenti-si-GATA-3 in EL-4 cells, GATA-3 gene expression was abrogated and downstream Th2 cytokines, such as interleukin-4 (IL-4) and IL-5, were also significantly inhibited. IT delivery of Lenti-si-GATA-3 in OVA-immunized mice resulted in a strong inhibition of local GATA-3 gene expression. Treatment with Lenti-si-GATA-3 successfully alleviated OVA-induced airway eosinophilia and Th2 cytokine release. While evaluating AHR by means of enhanced pause (Penh) and pulmonary resistance (R(L)) using body plethysmography, it was found that the administration of Lenti-si-GATA-3 had significantly decreased AHR in OVA-immunized mice. These results suggest that inhibition of GATA-3 gene expression by shRNAs lentiviral vectors strongly attenuates antigen-induced airway inflammation and hyper-responsiveness in mice.