Amyloid, Dementia, Disease modifying, Excitotoxicity, Glutamate, Multi-target-directed ligands, Multifunctional compounds, Neurodegeneration, Neuroprotection, Nicotinic, Alzheimer Disease, Amyloid beta-Peptides, Animals, Cell Survival, Cells, Cultured, Cotinine, Humans, Neurons, Neuroprotective Agents, Nicotine, Peptide Fragments, Rats, Receptors, N-Methyl-D-Aspartate