Particular aspects provide electrokinetically-generated fluids (e.g., electrokinetically-generated gas-enriched fluids and solutions), and therapeutic compositions and methods comprising use thereof in treating at least one symptom of cystic fibrosis. In particular embodiments, at least one symptom of cystic fibrosis treated by the present invention include inhibition of Pseudomonas infection, synergy with tobramycin (including TOBI) for use against bacterial infection, and synergy with a bronchiodilator. In particular embodiments, the electrokinetically-generated fluids or therapeutic compositions and methods comprise combination with other therapeutic agents (e.g., antibiotics, albuterol, budesonide, etc.). In certain aspects, the methods comprise regulating or modulating intracellular signal transduction by modulation of at least one of cellular membranes, membrane potential, membrane proteins such as membrane receptors, including but not limited to G protein coupled receptors, and intercellular junctions (e.g., tight junctions, gap junctions, zona adherins and desmasomes).