Antigen-Antibody Complex/physiology; Cell Differentiation/immunology; Cell Lineage/immunology; Dendritic Cells/cytology; Dendritic Cells/immunology; Growth Inhibitors/physiology; Monocytes/cytology; Monocytes/immunology; Animals; Antigen-Antibody Complex/blood; Autoimmune Diseases/immunology; Autoimmune Diseases/metabolism; Autoimmune Diseases/pathology; Cells, Cultured; Dendritic Cells/metabolism; Dendritic Cells/pathology; Dose-Response Relationship, Immunologic; Growth Inhibitors/blood; Humans; Immunoglobulin G/metabolism; Lupus Erythematosus, Systemic/immunology; Lupus Erythematosus, Systemic/metabolism; Lupus Erythematosus, Systemic/pathology; Lymphocyte Activation/immunology; Lymphocyte Culture Test, Mixed; Monocytes/metabolism; Monocytes/pathology; Rabbits; Receptors, IgG/antagonists & inhibitors; Receptors, IgG/biosynthesis; Receptors, IgG/physiology; T-Lymphocytes/immunology; Time Factors