Blood-Brain Barrier/immunology; Encephalitis/immunology; Gliosis/immunology; Neuroglia/immunology; Receptors, IgG/immunology; Toll-Like Receptor 4/immunology; Animals; Astrocytes/immunology; Astrocytes/metabolism; Blood-Brain Barrier/metabolism; Blood-Brain Barrier/physiopathology; Cytokines/immunology; Cytokines/metabolism; Disease Models, Animal; Down-Regulation/drug effects; Down-Regulation/immunology; Encephalitis/metabolism; Encephalitis/physiopathology; Epinephrine/pharmacology; Gliosis/metabolism; Gliosis/physiopathology; Immune Tolerance/immunology; Intracellular Signaling Peptides and Proteins/immunology; Intracellular Signaling Peptides and Proteins/metabolism; Male; Microglia/immunology; Microglia/metabolism; Myeloid Differentiation Factor 88/immunology; Myeloid Differentiation Factor 88/metabolism; Neuroglia/cytology; Neuroglia/metabolism; Protein-Tyrosine Kinases/immunology; Protein-Tyrosine Kinases/metabolism; Rats; Rats, Sprague-Dawley; Receptors, IgG/metabolism; Signal Transduction/immunology; Syk Kinase; Toll-Like Receptor 4/metabolism; Up-Regulation/drug effects; Up-Regulation/immunology; Vasoconstrictor Agents/pharmacology