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J Alzheimers Dis. 2016;50(2):605-16. doi: 10.3233/JAD-150813.

Reversal of LTP-Like Cortical Plasticity in Alzheimer's Disease Patients with Tau-Related Faster Clinical Progression.

Author information

1
Non Invasive Brain Stimulation Unit/Department of Behavioural and Clinical Neurology, Santa Lucia Foundation IRCCS, Rome, Italy.
2
Stroke Unit, Department of Neuroscience, Tor Vergata Policlinic, Rome, Italy.
3
Faculty of Sciences of Sport and Physical Education, Department of Physical Education, University of A Coruña, Pazos-Liáns, Oleiros, A Coruña, Spain.
4
Neuroimaging Laboratory, Santa Lucia Foundation, IRCCS, Rome, Italy.

Abstract

Cerebrospinal fluid (CSF) concentrations of amyloid-β (Aβ), total tau (t-tau), and phosphorylated tau proteins are associated with different clinical progression in Alzheimer's disease (AD). We enrolled forty newly diagnosed AD patients, who underwent lumbar puncture, and carried out a K-means cluster analysis based on CSF biomarkers levels, resulting in two AD patient groups: Cluster 1 showed relatively high levels of Aβ and low levels of tau; Cluster 2 showed relatively low levels of Aβ and high levels of tau. Cortical plasticity was tested using the intermittent and continuous theta burst stimulation (iTBS and cTBS) protocols evoking respectively long-term potentiation (LTP) and depression (LTD). Cholinergic transmission was tested by the short-latency afferent inhibition protocol. Neurophysiological evaluation showed that the two AD groups differed in terms of cortical plasticity: after iTBS, Cluster 2 patients showed a remarkable reversal of LTP toward LTD that was not observed in Cluster 1. LTD and central cholinergic transmission did not differ between groups. Patients were assessed longitudinally with Mini-Mental State Examination at 6, 12, and 18 month follow-ups. Cluster 2 AD had a faster cognitive decline already evident at the 12 month follow-up. High tau CSF levels were associated with LTD-like cortical plasticity and faster clinical progression. These results suggest that more aggressive tau pathology is associated with prominent LTD-like mechanisms of cortical plasticity and faster cognitive decline.

KEYWORDS:

Alzheimer’s disease; amyloid-beta; cortical plasticity; long-term depression; long-term potentiation; tau; transcranial magnetic stimulation

PMID:
26757193
DOI:
10.3233/JAD-150813
[Indexed for MEDLINE]

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