Calcium Signaling/drug effects; Cytoskeleton/drug effects; I-kappa B Proteins; Lysophospholipids; Muscle, Skeletal/drug effects; Sphingosine/analogs & derivatives; Sphingosine/pharmacology; Aniline Compounds; Animals; Caffeine/pharmacology; Calcium/metabolism; Calcium Channel Blockers/pharmacology; Calcium Channels, L-Type/metabolism; Calcium Signaling/physiology; Cell Line; Cytoskeleton/metabolism; Cytoskeleton/ultrastructure; DNA-Binding Proteins/antagonists & inhibitors; Diglycerides/biosynthesis; Extracellular Space/metabolism; Fluorescent Dyes; Inositol 1,4,5-Trisphosphate/biosynthesis; Inositol 1,4,5-Trisphosphate/pharmacology; Intracellular Fluid/metabolism; Mice; Microscopy, Confocal; Muscle Contraction/drug effects; Muscle, Skeletal/cytology; Muscle, Skeletal/metabolism; NF-KappaB Inhibitor alpha; Potassium/pharmacology; Receptors, Lysophospholipid; Ryanodine Receptor Calcium Release Channel/drug effects; Signal Transduction/drug effects; Signal Transduction/physiology; Suramin/pharmacology; Xanthenes