Abstract
Progressive hippocampal degeneration is a key component of Alzheimer’s disease (AD) progression. Therefore, identifying how hippocampal neuronal function is modulated early in AD is an important approach to eventually prevent degeneration. AD-risk factors and signaling molecules likely modulate neuronal function, including APOE genotype and angiotensin II. Compared to APOE3, APOE4 increases AD risk up to 12-fold, and high levels of angiotensin II are hypothesized to disrupt neuronal function in AD. However, the extent that APOE and angiotensin II modulates the hippocampal neuronal phenotype in AD-relevant models is unknown. To address this issue, we used electrophysiological techniques to assess the impact of APOE genotype and angiotensin II on basal synaptic transmission, presynaptic, and post-synaptic activity in mice that express human APOE3 (E3FAD) or APOE4 (E4FAD) and overproduce Aβ. We found that compared to E3FAD mice, E4FAD mice have lower synaptic activity, but higher levels of paired-pulse facilitation (PPF) and long-term potentiation (LTP) in the Schaffer Collateral Commissural Pathway (SCCP) of the hippocampus. We also found that exogenous angiotensin II has a profound inhibitory effect on hippocampal LTP in both E3FAD and E4FAD mice. Collectively, our data suggests that APOE4 and Aβ are associated with a hippocampal phenotype comprised of lower basal activity and higher responses to high-frequency stimulation, the latter of which is suppressed by angiotensin II. These novel data suggest a potential mechanistic link between hippocampal activity, APOE4 genotype, and angiotensin II in AD.
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Data Availability
The datasets used and/or analyzed during the current study are provided as a supplementary file and are available from the corresponding author on reasonable request.
Abbreviations
- AD:
-
Alzheimer’s disease
- ARBs:
-
angiotensin receptor blockers
- AT1R:
-
angiotensin type 1 receptor
- aCSF:
-
artificial cerebrospinal fluid
- APP K670N/M671L + I716 V + V717I and PS1 M146L + L286 V:
-
EFAD mice: mice that express human APOE3- or APOE4- and 5 FAD mutations
- FAD:
-
familial AD models
- fEPSPs:
-
field excitatory post-synaptic potential
- HFS:
-
high-frequency stimulation
- LTP:
-
long-term potentiation
- PPF:
-
paired-pulse facilitation
- PTP:
-
post-tetanic potentiation
- SCCP:
-
Schaffer Collateral Commissural Pathway
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This work was supported by National Institutes of Health grants R01AG061114 (LMT), R61NS114353 (LMT), R01MH086507 (KYT), and University of Illinois at Chicago Institutional funds (LMT & KYT).
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L. M. T., S. B. S., S. A., and K. Y. T. designed the study and interpreted data. S. B. S. conducted experiments. L. M. T., S. B. S., and S. A. wrote the manuscript. All authors read and approved the final manuscript.
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Scheinman, S.B., Tseng, K.Y., Alford, S. et al. Higher Neuronal Facilitation and Potentiation with APOE4 Suppressed by Angiotensin II. Mol Neurobiol 61, 120–131 (2024). https://doi.org/10.1007/s12035-023-03556-9
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DOI: https://doi.org/10.1007/s12035-023-03556-9