Provided are electrokinetically-altered fluids (e.g., gas-enriched (e.g., oxygen-enriched) electrokinetic fluids) comprising an ionic aqueous solution of charge-stabilized oxygen-containing nanostructures in an amount sufficient to provide, upon contact with a cell, modulation of at least one of cellular membrane potential and cellular membrane conductivity. Further provided are the methods of making the electrokinetically-altered ionic aqueous fluid compositions. Particular aspects provide for regulating or modulating intracellular signal transduction associated 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 (GPCR), and intercellular junctions (e.g., tight junctions, gap junctions, zona adherins and desmasomes). Other embodiments include particular methods of producing the electrokinetically-altered fluids. The electrokinetically-altered fluid compositions and methods of producing the fluid include electrokinetically-altered ionic aqueous fluids optionally in the form of solvated electrons stabilized with molecular oxygen.