Enhanced susceptibility of pediatric airway epithelium to respiratory syncytial virus infection.

Immature innate and adaptive immunity and vulnerability of narrower airways to obstruction increase the susceptibility of infants to severe respiratory syncytial virus (RSV) disease. In this issue of the JCI, Zhao et al. illustrated greater intrinsic susceptibility of pediatric versus adult airway epithelial cells to RSV-induced cytopathology. Using precision cut lung slices (PCLS) and air-liquid interface (ALI) airway epithelial cell cultures, the authors showed that impaired STAT3 activation in RSV-infected pediatric multiciliated cells increased cell apoptosis and viral shedding, which enhanced the spread of infection. Bolstering STAT3 activation and treatment of neonatal mice with apoptosis inhibitors suppressed virus spread, suggesting that enhancing STAT3 activation may provide therapeutic benefit.