Session I Effects of Messengers on Membrane Receptors.- A Effects of Transmitters and Modulators.- 1. Interactions between Convergent Afferent Transmitter Systems.- 2. Interactions of Peptides and Monoamines in Central Neurons: Role of Second Messengers.- 3. Multiple Transduction Mechanisms for Dopamine D2 Receptors in Anterior Pituitary Cells.- 4. Receptor Reserves at ?2-adrenergic and Dopaminergic Autoreceptors.- B Effects of Trophic Factors and Gangliosides.- 5. Potentiation of NGF-mediated Effects of Laminin.- 6. Gangliosides as Modulators of Neuronotrophic Interactions.- 7. Influence of Gangliosides and Nerve Growth Factor on the Plasticity of Forebrain Cholinergic Neurons.- 8. Hippocampal Stimulation of Cholinergic Expression in Primary Cultures of Basal Forebrain Neurons.- C Effects of Neurosteroids and Classical Steroids.- 9. Neurosteroids: Pregnenolone and Dehydroepiandrosterone in the Brain.- 10. Estrogenic and Antiestrogenic Modulation of Neuronal Membrane Sensitivity.- 11. Effects of Estrogens on the Electrophysiological Properties of Neurons and Adenohypophyseal Cells: Interactions with Dopamine.- Session II Interactions between Receptors in the Membrane.- A Possible Interactions between Molecular and Supramolecular Entities in the Membrane.- 12. Receptor Modification and Receptor Disposition in Membranes.- 13. Membrane Phospholipid Metabolism and Transmitters.- 14. Allosteric Sites and Conformational Transitions of the Acetylcholine Receptor: Models for Short-term Regulation of Receptor Response.- 15. Chloride Channel Modulation at GABAergic Synapses in Primary Cultures of Cortical Neurons.- 16. Mechanisms of Receptor-coupled Signal Transduction.- 17. The Gi-protein as a Target for Receptor-Receptor Interactions.- B Interactions between Receptors in Synaptic Membranes in the Central Nervous System.- 18. On the Role of Receptor-Receptor Interactions in Synaptic Transmission: Biochemical and Autoradiographical Studies on the Interactions between ?2-adrenl$