Adaptor Proteins, Signal Transducing; Adaptor Proteins, Vesicular Transport; Growth Inhibitors/metabolism; Lymphokines; Milk Proteins; Receptors, Cytokine/metabolism; Signal Transduction; Acute-Phase Proteins/metabolism; Animals; Antigens, CD/metabolism; Blotting, Northern; Blotting, Western; Cytokine Receptor gp130; DNA, Complementary/metabolism; DNA-Binding Proteins/metabolism; Dose-Response Relationship, Drug; Electrophoresis, Polyacrylamide Gel; Humans; Interleukin-6/metabolism; Intracellular Signaling Peptides and Proteins; JNK Mitogen-Activated Protein Kinases; Leukemia Inhibitory Factor; Leukemia Inhibitory Factor Receptor alpha Subunit; Membrane Glycoproteins/metabolism; Mice; Mitogen-Activated Protein Kinases/metabolism; Plasmids/metabolism; Precipitin Tests; Protein Binding; Protein Tyrosine Phosphatase, Non-Receptor Type 11; Protein Tyrosine Phosphatase, Non-Receptor Type 6; Protein Tyrosine Phosphatases/metabolism; Proteins/metabolism; Rats; Receptors, OSM-LIF; Receptors, Oncostatin M; STAT5 Transcription Factor; Shc Signaling Adaptor Proteins; Src Homology 2 Domain-Containing, Transforming Protein 1; Thymidine/metabolism; Time Factors; Trans-Activators/metabolism; Transduction, Genetic; Transfection; Tumor Cells, Cultured