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Psychological Terms — Amyloid Plaque
An amyloid plaque is a dense extracellular deposit of beta-amyloid protein (BAP) found within the brain, especially common in aging populations and prominently associated with Alzheimer’s disease. These insoluble deposits accumulate in regions such as the cerebral cortex, hippocampus, amygdala, and the entorhinal cortex, disrupting neural communication and contributing to neuronal degeneration.
They are believed to interfere with synaptic functioning, ultimately impairing cognition, memory, and executive processes.
Beta-amyloid consists of roughly 40 amino acids and is derived from the abnormal breakdown of a larger precursor protein encoded on chromosome 21 — a fact that helps explain the elevated incidence of Alzheimer-like pathology in individuals with Down syndrome. As plaques accumulate, they are often accompanied by neurofibrillary tangles composed of tau protein, which further destabilize neuronal structure.
Amyloid plaques are so central to Alzheimer’s research that they form a major diagnostic feature in neuropathological examination. Their presence has spurred pharmacological efforts to prevent or remove beta-amyloid buildup, although therapeutic results have been mixed. Historically, the term amyloid derives from the mistaken belief that plaques resembled starch; later studies disproved this characterization, identifying them as proteinaceous formations.
An amyloid plaque is a dense extracellular deposit of beta-amyloid protein (BAP) found within the brain, especially common in aging populations and prominently associated with Alzheimer’s disease. These insoluble deposits accumulate in regions such as the cerebral cortex, hippocampus, amygdala, and the entorhinal cortex, disrupting neural communication and contributing to neuronal degeneration.
They are believed to interfere with synaptic functioning, ultimately impairing cognition, memory, and executive processes.
Beta-amyloid consists of roughly 40 amino acids and is derived from the abnormal breakdown of a larger precursor protein encoded on chromosome 21 — a fact that helps explain the elevated incidence of Alzheimer-like pathology in individuals with Down syndrome. As plaques accumulate, they are often accompanied by neurofibrillary tangles composed of tau protein, which further destabilize neuronal structure.
Amyloid plaques are so central to Alzheimer’s research that they form a major diagnostic feature in neuropathological examination. Their presence has spurred pharmacological efforts to prevent or remove beta-amyloid buildup, although therapeutic results have been mixed. Historically, the term amyloid derives from the mistaken belief that plaques resembled starch; later studies disproved this characterization, identifying them as proteinaceous formations.
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