has subject area Aging Animals Antigen Presentation CD11c Antigen CD8 Antigens Cytokines Dendritic Cells Lipopolysaccharides Male Mice Mice, Inbred C57BL Mice, Transgenic STAT1 Transcription Factor STAT3 Transcription Factor Signal Transduction Spleen Toll-Like Receptor 4 Tumor Necrosis Factor-alpha