The potential therapeutic role of potassium channel modulators in asthma and chronic obstructive pulmonary disease.

The involvement of a number of potassium channels has been reported in respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD), supporting the idea that potassium channel modulating agents may help control it. Experimental evidence and preclinical models suggest that ATP-dependent K(+) (K(ATP)) channel openers, big-conductance K(+) (BK(CA)) channel openers, and intermediate-conductance K(+) (IK(CA)) channel blockers may be the most effective agents for treating asthma and COPD. Modulation of potassium channels by these agents may produce beneficial effects such as bronchodilation, a reduction in airways hyperresponsiveness (AHR), a reduction in cough and mucus production and an inhibition in airway inflammation and remodelling. The aim of this paper is to investigate the role of K(+) channel modulation in the pathogenesis, progression and exacerbation of asthma and COPD, and to review the evidence suggesting that K(+) channel modulators may be a valuable treatment option for these respiratory diseases.