caa a22 4500 606202153 CHVBK 20210128100951.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00429-014-0757-1 doi (NATIONALLICENCE)springer-10.1007/s00429-014-0757-1 Impaired cortical oscillatory coupling in mild cognitive impairment: anatomical substrate and ApoE4 effects [Elektronische Daten] [Gabriel Gonzalez-Escamilla, Mercedes Atienza, Jose Cantero] Our current knowledge about the anatomical substrate of impaired resting-state cortical oscillatory coupling in mild cognitive impairment is still rudimentary. Here, we show that both resting-state oscillatory coupling and its anatomical correlates clearly distinguish healthy older (HO) adults from individuals with amnestic mild cognitive impairment (aMCI). aMCI showed failures in neural-phase coupling of resting-state electroencephalographic alpha activity mostly evident between fronto-temporal and parietal regions. As oligomers of amyloid-beta (Aβ) are linked to synaptic dysfunction in Alzheimer's disease (AD), we further investigated whether plasma concentrations of these oligomers (Aβ40 and Aβ42) accounted for impaired patterns of oscillatory coupling in aMCI. Results revealed that decreased plasma Aβ42 was associated with augmented coupling of parieto-temporal regions in HO subjects, but no relationship was found in aMCI. Oscillatory coupling of frontal regions was also significantly reduced in aMCI carriers of the ε4 allele of the Apolipoprotein E (ApoE) compared to ε4 noncarriers, although neither neuroanatomical nor plasma Aβ changes accounted for this difference. However, the abnormal pattern of oscillatory coupling in aMCI was negatively related to volume of the angular gyrus, and positively related to volume of the precuneus and the splenium of the corpus callosum. Previous evidence suggests that all these regions are neuropathological targets of AD. The current study takes that scenario one step further, suggesting that this anatomical damage could be responsible for disrupted cortical oscillatory coupling in aMCI. Together, these data shed light on how the MCI status modifies anatomo-functional relationships underlying coordination of large-scale cortical systems in the resting-state. Springer-Verlag Berlin Heidelberg, 2014 Functional connectivity nationallicence Resting-state cortical networks nationallicence Anatomical integrity nationallicence ApoE4 nationallicence Amyloid-beta nationallicence Neural-phase coupling nationallicence Mild cognitive impairment nationallicence Alzheimer's disease nationallicence Gonzalez-Escamilla Gabriel Laboratory of Functional Neuroscience, Spanish Network of Excellence for Research on Neurodegenerative Diseases (CIBERNED), Pablo de Olavide University, Ctra. de Utrera Km 1, 41013, Seville, Spain aut Atienza Mercedes Laboratory of Functional Neuroscience, Spanish Network of Excellence for Research on Neurodegenerative Diseases (CIBERNED), Pablo de Olavide University, Ctra. de Utrera Km 1, 41013, Seville, Spain aut Cantero Jose Laboratory of Functional Neuroscience, Spanish Network of Excellence for Research on Neurodegenerative Diseases (CIBERNED), Pablo de Olavide University, Ctra. de Utrera Km 1, 41013, Seville, Spain aut Brain Structure and Function Springer Berlin Heidelberg 220/3(2015-05-01), 1721-1737 1863-2653 220:3<1721 2015 220 429 https://doi.org/10.1007/s00429-014-0757-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00429-014-0757-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gonzalez-Escamilla Gabriel Laboratory of Functional Neuroscience, Spanish Network of Excellence for Research on Neurodegenerative Diseases (CIBERNED), Pablo de Olavide University, Ctra. de Utrera Km 1, 41013, Seville, Spain aut NATIONALLICENCE 700 1- Atienza Mercedes Laboratory of Functional Neuroscience, Spanish Network of Excellence for Research on Neurodegenerative Diseases (CIBERNED), Pablo de Olavide University, Ctra. de Utrera Km 1, 41013, Seville, Spain aut NATIONALLICENCE 700 1- Cantero Jose Laboratory of Functional Neuroscience, Spanish Network of Excellence for Research on Neurodegenerative Diseases (CIBERNED), Pablo de Olavide University, Ctra. de Utrera Km 1, 41013, Seville, Spain aut NATIONALLICENCE 773 0- Brain Structure and Function Springer Berlin Heidelberg 220/3(2015-05-01), 1721-1737 1863-2653 220:3<1721 2015 220 429