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1 Acta Neurobiologiae Experimentalis

1 2013

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Mitochondrial dysfunction-the mising link between aging and sporadic AD?

100%

Leuner K. , Mueller W. E.

tom 73

nr Suppl.1

The non-Mendelian sporadic Alzheimer’s disease (AD) is the most frequent form of dementia diagnosed worldwide. The most important risk factor to develop sporadic AD is aging itself. Next to hyperphosphorylated Tau, intracellular amyloid beta (Aβ) oligomers are known to initiate a cascade of pathological events ranging from mitochondrial dysfunction, synaptic dysfunction, oxidative stress, and loss of calcium regulation, to inflammation. All these events are considered to play an important role in the progressive loss of neurons. The molecular mechanisms determining the balance between Aβ production and clearance during the progression of the disease are not well understood. Furthermore, there is cumulating evidence that Aβ formation impairs mitochondrial function. On the other hand, mitochondrial dysfunction, in particular increased formation of mitochondrially derived reactive oxygen species, promote Aβ formation. We propose that mitochondrial dysfunction, which is well-known to increase with age, is an initial trigger for Aβ production. A vicious cycle is initiated that originates from mitochondrial dysfunction, implying that AD can be viewed as an age-associated mitochondrial disorder. The proposed mechanism sheds new light on the pathophysiological changes taking place during the progression of AD as well as in the aging process.