Nerve Growth Factors/pharmacology; Neurites/physiology; Proto-Oncogene Proteins/metabolism; Receptor Protein-Tyrosine Kinases/metabolism; Receptors, Nerve Growth Factor/metabolism; Serotonin/metabolism; Signal Transduction/physiology; alpha-Macroglobulins/metabolism; Adrenal Gland Neoplasms; Animals; ErbB Receptors/isolation & purification; ErbB Receptors/metabolism; Fibrinolysin/metabolism; Humans; Male; Mice; Mitogen-Activated Protein Kinase 1; Neurites/drug effects; PC12 Cells; Pheochromocytoma; Phosphorylation; Protein Serine-Threonine Kinases/metabolism; Protein-Tyrosine Kinases/metabolism; Proto-Oncogene Proteins/drug effects; Proto-Oncogene Proteins/isolation & purification; Receptor Protein-Tyrosine Kinases/drug effects; Receptor Protein-Tyrosine Kinases/isolation & purification; Receptor, trkA; Receptors, Nerve Growth Factor/drug effects; Receptors, Nerve Growth Factor/isolation & purification; Receptors, Platelet-Derived Growth Factor/isolation & purification; Receptors, Platelet-Derived Growth Factor/metabolism; Serotonin/pharmacology; Signal Transduction/drug effects; alpha-Macroglobulins/isolation & purification; alpha-Macroglobulins/pharmacology