Intracellular deposits of amyloid-beta influence the ability of human iPSC-derived astrocytes to support neuronal function

Journal of Neuroinflammation

Research

Benjamin Portal¹  Maria Lindskog¹  Chiara Beretta²  Tobias Mothes²  Evangelos Konstantinidis²  Anna Erlandsson² 

[1] Department of Medical Cell Biology, Uppsala University, 751 23, Uppsala, Sweden;Department of Public Health and Caring Sciences, Molecular Geriatrics, Uppsala University, 751 85, Uppsala, Sweden;

关键词: Alzheimer’s disease;    Amyloid-beta;    Astrocytes;    Electrophysiology;    EPSCs;    iPSCs;    Neurons;   

DOI  :  10.1186/s12974-022-02687-5

 received in 2022-10-31, accepted in 2022-12-23,  发布年份 2022

来源: Springer

【 摘 要 】

BackgroundAstrocytes are crucial for maintaining brain homeostasis and synaptic function, but are also tightly connected to the pathogenesis of Alzheimer’s disease (AD). Our previous data demonstrate that astrocytes ingest large amounts of aggregated amyloid-beta (Aβ), but then store, rather than degrade the ingested material, which leads to severe cellular stress. However, the involvement of pathological astrocytes in AD-related synaptic dysfunction remains to be elucidated.MethodsIn this study, we aimed to investigate how intracellular deposits of Aβ in astrocytes affect their interplay with neurons, focusing on neuronal function and viability. For this purpose, human induced pluripotent stem cell (hiPSC)-derived astrocytes were exposed to sonicated Αβ42 fibrils. The direct and indirect effects of the Αβ-exposed astrocytes on hiPSC-derived neurons were analyzed by performing astrocyte–neuron co-cultures as well as additions of conditioned media or extracellular vesicles to pure neuronal cultures.ResultsElectrophysiological recordings revealed significantly decreased frequency of excitatory post-synaptic currents in neurons co-cultured with Aβ-exposed astrocytes, while conditioned media from Aβ-exposed astrocytes had the opposite effect and resulted in hyperactivation of the synapses. Clearly, factors secreted from control, but not from Aβ-exposed astrocytes, benefited the wellbeing of neuronal cultures. Moreover, reactive astrocytes with Aβ deposits led to an elevated clearance of dead cells in the co-cultures.ConclusionsTaken together, our results demonstrate that inclusions of aggregated Aβ affect the reactive state of the astrocytes, as well as their ability to support neuronal function.

【 授权许可】

CC BY   
© The Author(s) 2023

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