Details

Autor(en) / Beteiligte

• Adlard, Paul A
• Perreau, Victoria M
• Pop, Viorela
• Cotman, Carl W

Titel

Voluntary Exercise Decreases Amyloid Load in a Transgenic Model of Alzheimer's Disease

Ist Teil von

• The Journal of neuroscience, 2005-04, Vol.25 (17), p.4217-4221

Ort / Verlag

United States: Soc Neuroscience

Erscheinungsjahr

2005

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Alzheimer's disease (AD) is a progressive neurodegenerative disorder for which there are few therapeutics that affect the underlying disease mechanism. Recent epidemiological studies, however, suggest that lifestyle changes may slow the onset/progression of AD. Here we have used TgCRND8 mice to examine directly the interaction between exercise and the AD cascade. Five months of voluntary exercise resulted in a decrease in extracellular amyloid-beta (Abeta) plaques in the frontal cortex (38%; p = 0.018), the cortex at the level of the hippocampus (53%; p = 0.0003), and the hippocampus (40%; p = 0.06). This was associated with decreased cortical Abeta1-40 (35%; p = 0.005) and Abeta1-42 (22%; p = 0.04) (ELISA). The mechanism appears to be mediated by a change in the processing of the amyloid precursor protein (APP) after short-term exercise, because 1 month of activity decreased the proteolytic fragments of APP [for alpha-C-terminal fragment (alpha-CTF), 54% and p = 0.04; for beta-CTF, 35% and p = 0.03]. This effect was independent of mRNA/protein changes in neprilysin and insulin-degrading enzyme and, instead, may involve neuronal metabolism changes that are known to affect APP processing and to be regulated by exercise. Long-term exercise also enhanced the rate of learning of TgCRND8 animals in the Morris water maze, with significant (p < 0.02) reductions in escape latencies over the first 3 (of 6) trial days. In support of existing epidemiological studies, this investigation demonstrates that exercise is a simple behavioral intervention sufficient to inhibit the normal progression of AD-like neuropathology in the TgCRND8 mouse model.