1-Methyl-3-isobutylxanthine, Adrenergic alpha-Agonists, Adrenergic alpha-Antagonists, Amiloride, Animals, Cell Transformation, Viral, Cells, Cultured, Cyclic AMP, Doxazosin, Endothelium, Vascular, Epithelial Sodium Channels, GTP-Binding Proteins, Herpesvirus 4, Human, Humans, Isoproterenol, Membrane Potentials, Norepinephrine, Patch-Clamp Techniques, Prazosin, Rats, Receptors, Adrenergic, alpha, Recombinant Proteins, Second Messenger Systems, Sodium Channels, Thionucleotides, Transcription, Genetic