Article

Does Donepezil Treatment Slow the Progression of Hippocampal Atrophy in Patients With Alzheimer’s Disease?

Osaka University, Suika, Ōsaka, Japan
American Journal of Psychiatry (Impact Factor: 12.3). 05/2005; 162(4):676-82. DOI: 10.1176/appi.ajp.162.4.676
Source: PubMed

ABSTRACT

The only approved pharmacological approach for the symptomatic treatment of Alzheimer's disease in Japan is the use of a cholinesterase inhibitor, donepezil hydrochloride. Recent in vivo and in vitro studies raise the possibility that cholinesterase inhibitors can slow the progression of Alzheimer's disease. The purpose of the present study was to determine whether donepezil has a neuroprotective effect in Alzheimer's disease by using the rate of hippocampal atrophy as a surrogate marker of disease progression.
In a prospective cohort study, 54 patients with Alzheimer's disease who received donepezil treatment and 93 control patients with Alzheimer's disease who never received anti-Alzheimer drugs underwent magnetic resonance imaging (MRI) twice at a 1-year interval. The annual rate of hippocampal atrophy of each subject was determined by using an MRI-based volumetric technique. Background characteristics, age, sex, disease duration, education, MRI interval, apolipoprotein E (APOE) genotype, and baseline Alzheimer's Disease Assessment Scale score were comparable between the treated and control groups.
The mean annual rate of hippocampal volume loss among the treated patients (mean=3.82%, SD=2.84%) was significantly smaller than that among the control patients (mean=5.04%, SD=2.54%). Upon analysis of covariance, where those confounding variables (age, sex, disease duration, education, MRI interval, APOE genotype, and baseline Alzheimer's Disease Assessment Scale score) were entered into the model as covariates, the effect of donepezil treatment on hippocampal atrophy remained significant.
Donepezil treatment slows the progression of hippocampal atrophy, suggesting a neuroprotective effect of donepezil in Alzheimer's disease.

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    • "Donepezil hydrochloride (HCl) is a chemically unique, piperidine-based acetylcholinesterase inhibitor that has shown cognitive and functional benefit in the treatment of mild, moderate, and severe AD dementia in multiple randomized controlled trials [9]. In addition to its symptomatic effects on memory and cognition, donepezil has demonstrated some effects on the cellular and molecular system level associated with AD in nonclinical studies that may contribute to the significant changes observed on hippocampus in patients with mild moderate AD dementia treated with donepezil [10] [11]. In subjects with MCI, the effect of donepezil is less clearly understood. "
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    ABSTRACT: To study the effect of donepezil on the rate of hippocampal atrophy in prodromal Alzheimer's disease (AD). A double-blind, randomized, placebo-controlled parallel group design using donepezil (10 mg/day) in subjects with suspected prodromal AD. Subjects underwent two brain magnetic resonance imaging scans (baseline and final visit). The primary efficacy outcome was the annualized percentage change (APC) of total hippocampal volume (left + right) measured by an automated segmentation method. Two-hundred and sixteen only subjects were randomized across 28 French expert clinical sites. In the per protocol population (placebo = 92 and donepezil = 82), the donepezil group exhibited a significant reduced rate of hippocampal atrophy (APC = -1.89%) compared with the placebo group (APC = -3.47%), P < .001. There was no significant difference in neuropsychological performance between treatment groups. A 45% reduction of rate of hippocampal atrophy was observed in prodromal AD following 1 year of treatment with donepezil compared with placebo. Copyright © 2014 The Alzheimer's Association. Published by Elsevier Inc. All rights reserved.
    Full-text · Article · Jan 2015 · Alzheimer's & dementia: the journal of the Alzheimer's Association
    • "Donepezil [R, S-1-benzyl-4-[(5, 6-dimethoxy-1-indanon)-2-yl] methylpiperidine hydrochloride] is a drug used clinically for cognitive dysfunction in AD (Giacobini, 2000; Hansen et al., 2008). Although its major mechanism of action is to inhibit cholinesterase activity, which increases acetylcholine (ACh) level and cholinergic transmission (Giacobini, 2000), several clinical studies have suggested that donepezil also has excellent neuroprotective and disease-modifying effects in AD patients (Hashimoto et al., 2005; Krishnan et al., 2003; Rogers et al., 2000; Winblad et al., 2006). Moreover, in vitro and animal studies using donepezil have also shown that donepezil does not function solely at the level of Ach but does influence AD progression through numerous cellular and molecular effects (Jacobson and Sabbagh, 2008). "
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    ABSTRACT: Recent studies on Alzheimer's disease (AD) have focused on soluble oligomeric forms of amyloid-beta (Aβ oligomer, AβO) that are directly associated with AD-related pathologies, such as cognitive decline, neurodegeneration, and neuroinflammation. Donepezil is a well-known anti-dementia agent that increases acetylcholine levels through inhibition of acetylcholinesterase. However, a growing body of experimental and clinical studies indicates that donepezil may also provide neuroprotective and disease-modifying effects in AD. Additionally, donepezil has recently been demonstrated to have anti-inflammatory effects against lipopolysaccharides and tau pathology. However, it remains unknown whether donepezil has anti-inflammatory effects against AβO in cultured microglial cells and the brain in animals. Further, the effects of donepezil against AβO-mediated neuronal death, astrogliosis, and memory impairment have also not yet been investigated. Thus, in the present study, we examined the anti-inflammatory effect of donepezil against AβO and its neuroinflammatory mechanisms. Donepezil significantly attenuated the release of inflammatory mediators (prostaglandin E2, interleukin-1 beta, tumour necrosis factor-α, and nitric oxide) from microglia. Donepezil also decreased AβO-induced up-regulation of inducible nitric oxide synthase and cyclooxygenase-2 protein and phosphorylation of p38 mitogen-activated protein kinase as well as translocation of nuclear factor-kappa B. We next showed that donepezil suppresses activated microglia-mediated toxicity in primary hippocampal cells using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. In intrahippocampal AβO-injected mice, donepezil significantly inhibited microgliosis and astrogliosis. Furthermore, behavioural tests revealed that donepezil (2 mg/kg/day, 5 days, p.o.) significantly ameliorated AβO-induced memory impairment. These results suggest that donepezil directly inhibits microglial activation induced by AβO through blocking MAPK and NF-κB signaling and, in part, contributing to the amelioration of neurodegeneration and memory impairment.
    No preview · Article · Jan 2014 · NeuroToxicology
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    • "Previous studies demonstrated that AChE inhibitors, such as donepezil and galantamine, exert a protective effect via the nicotinic acetylcholine receptor (nAChR)-mediated cascade [21,22]. In addition, it has been reported that AChE inhibitors inhibit the progress of brain atrophy in AD [23], indicating the attenuation of neuronal death in the brain of the patients. "
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    ABSTRACT: Tolerance to the analgesic effect of opioids is a pharmacological phenomenon that occurs after their prolonged administration. It has been shown that morphine-induced tolerance is associated with apoptosis in the central nervous system and neuroprotective agents which prevented apoptosis signaling could attenuate tolerance to the analgesic effects. On the other hand donepezil, an acetylcholinesterase inhibitor, has been reported to have neuroprotective effects. Therefore in this study, the effect of systemic administration of donepezil on morphine-induced tolerance and apoptosis in the rat cerebral cortex and lumbar spinal cord was evaluated. Various groups of rats received morphine (ip) and different doses of donepezil (0, 0.5, 1, 1.5 mg/kg/day). Nociception was assessed using tail flick apparatus. Tail flick latency was recorded when the rat shook its tail. For apoptosis assay other groups of rats received the above treatment and apoptosis was evaluated by in situ terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end-labeling (TUNEL) method. The results showed that administration of donepezil (0.5, 1, 1.5 mg/kg, ip) delayed the morphine tolerance for 9, 12 and 17 days, respectively. Furthermore pretreatment injection of donepezil attenuated the number of apoptotic cells in the cerebral cortex and lumbar spinal cord compared to the control group. In conclusion, we found that systemic administration of donepezil attenuated morphine-induced tolerance and apoptosis in the rat cerebral cortex and lumbar spinal cord.
    Full-text · Article · Jan 2014 · Journal of Biomedical Science
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