TY  - CONF
AU  - Gatzen, Julia
AU  - Fischer, Larissa
AU  - Behrenbruch, Niklas
AU  - Schumann-Werner, Beate
AU  - Schwarck, Svenja
AU  - Molloy, Eóin N.
AU  - Hochkeppler, Anne
AU  - Garcia-Garcia, Berta
AU  - Buechel, Anna-Therese
AU  - Incesoy, Enise I
AU  - Rullmann, Michael
AU  - Patt, Marianne
AU  - Schildan, Andreas
AU  - Stephens, Andrew W.
AU  - Behnisch, Gusalija
AU  - Morgado, Barbara
AU  - Esselmann, Hermann
AU  - Seidenbecher, Constanze I.
AU  - Schott, Björn H.
AU  - Barthel, Henryk
AU  - Sabri, Osama
AU  - Wiltfang, Jens
AU  - Kreissl, Michael C.
AU  - Düzel, Emrah
AU  - Maass, Anne
TI  - Episodic memory network connectivity with aging and Alzheimer’s disease pathology in cognitively unimpaired older adults
JO  - Alzheimer's and dementia
VL  - 21
IS  - S7
SN  - 1552-5260
M1  - DZNE-2026-00012
SP  - e108678
PY  - 2025
AB  - Background:Regions of the medial temporal lobe and posteromedial cortex are crucial for episodic memory and are among the first to be affected by Alzheimer´s disease (AD) pathology. Hyperconnectivity in association with amyloid and tau pathology has been found in preclinical stages of AD, and may be compensatory or detrimental to memory function. Aiming to identify distinct connections displaying aberrant resting-state functional connectivity (rsFC), we hypothesized lower rsFC with higher age in non-pathological aging, and higher rsFC with higher pathology burden, especially in APOE4 carriers.Method:In this preregistered study, we analysed cross-sectional resting-state fMRI data and blood- and PET-markers of amyloid, tau and APOE status from an observational aging cohort (SFB1436). RsFC strength was examined between predefined ROIs. The sample included 187 cognitively unimpaired older adults (71±7years, 92 female, 44 APOE4 carrier). We investigated associations between rsFC, AD pathology burden, and CAG (cognitive age gap) and potential APOE interactions. Multiple regression models and a moderation analysis with rsFC strength were used. An A-T- subcohort was formed to investigate the effect of age on rsFC and to differentiate it from the effect of pathology.Result:We found a significant association between higher blood-based pathology and low rsFC in the right posterior hippocampus to bilateral subgenual medial prefrontal cortex (mPFC). No significant association was observed between rsFC and tau-PET burden, APOE4 status or age (within A-T-subcohort). Additionally, there was no significant effect of pathology on CAG. Furthermore, we found no evidence of rsFC moderating the relationship between pathology and CAG.Conclusion:Our results do not support the initial hypothesis, which predicted hyperconnectivity in distinct brain regions with high pathology. This could be due to relatively low overall pathology burden, consistent with an early preclinical stage of potential disease progression. This interpretation is further supported by the absence of significant associations between pathology or rsFC strength and memory performance. We identified lower rsFC strength in two distinct connections with higher blood-based pathology. These alterations were not observed in the A-T- subcohort, suggesting it to be an early marker differentiating pathological from healthy aging.
T2  - Alzheimer’s Association International Conference
CY  - 27 Jul 2025 - 31 Jul 2025, Toronto (Canada)
Y2  - 27 Jul 2025 - 31 Jul 2025
M2  - Toronto, Canada
LB  - PUB:(DE-HGF)1 ; PUB:(DE-HGF)16
DO  - DOI:10.1002/alz70861_108678
UR  - https://pub.dzne.de/record/283116
ER  -