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The Journal of Neuroscience, November 26, 2003, 23(34):10879-10883

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BRIEF COMMUNICATION
Amyloid- Antibody Treatment Leads to Rapid Normalization of Plaque-Induced Neuritic Alterations

Julianne A. Lombardo, Edward A. Stern, Megan E. McLellan, Stephen T. Kajdasz, Gregory A. Hickey, Brian J. Bacskai, and Bradley T. Hyman

Center for Aging, Genetics, and Neurodegeneration, Department of Neurology, Massachusetts General Hospital, Charlestown, Massachusetts 02129

The accumulation of amyloid- into insoluble plaques is a characteristic feature of Alzheimer's disease. Neuronal morphology is distorted by plaques: rather than being essentially straight, they are substantially more curved than those in control tissue, their trajectories become altered, and they are frequently distended or swollen, presumably affecting synaptic transmission. Clearance of plaques by administration of antibodies to amyloid- is a promising therapeutic approach to the treatment of Alzheimer's disease, leading to stabilization of dementia by an unknown cellular mechanism. The effect of plaque clearance on plaque-induced neuronal alterations has not been studied previously. Here we show that both plaques and neuritic lesions are reversible in a strikingly short period of time after administration of a single dose of amyloid- antibody. Amyloid clearance and recovery of normal neuronal geometries were observed as early as 4 d and lasted at least 32 d after a single treatment. These results demonstrate that, once plaques are cleared, neuronal morphology is self-correcting and that passive antibody treatment has the potential to reverse neuronal damage caused by Alzheimer's disease and, hence, directly impact cognitive decline. Moreover, the rapid normalization of neuritic dystrophy suggests an unexpected degree of plasticity in the adult nervous system.

Key words: Alzheimer; immunotherapy; antibody; plasticity; neurodegeneration; amyloid

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Received May 27, 2003; revised October 3, 2003; accepted October 3, 2003.

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