Abstract
Widespread damage of airway epithelium and defective epithelial repair are hallmarks of chronic asthma. Growth factors and cytokines spatially and temporally regulate epithelial shedding and repair. Within this context, a key function is exerted by transforming growth factor (TGF)-β. Recent growing evidence suggests that chloride (Cl
-) channels are critical to cell apoptosis. We examined the effects of TGF-β1 on Cl
- channel expression and activity and its relationship with apoptosis in human bronchial epithelial cells (HBECs). The small interfering RNA (siRNA) approach was used to investigate the potential role of CLC-3, a member of the volume-regulated Cl
- channel family, in apoptosis of HBECs. TGF-β1 significantly induced HBEC apoptosis, which paralleled to a significant decrease in the endogenous expression of CLC-3 protein and mRNA transcripts. Outward rectifying and voltage-dependent CLC-3-like Cl
- currents in HBECs were diminished by TGF-β1. siRNA for CLC-3 abolished Cl
- current and enhanced TGF-β1-induced cell apoptosis. Overexpression of CLC-3 in HBECs inhibited TGF-β1-induced cell apoptosis. Bcl-2 was also downregulated after TGF-β stimulation. TGF-β1-induced cell apoptosis was suppressed in Bcl-2-transfected HBECs. Our data demonstrate that CLC-3-like voltage-gated chloride channels play a critical role in TGF-β-induced apoptosis of human airway epithelial cells.