Abstract:
:Amyloid-β oligomers (AβOs) toxicity causes mitochondrial dysfunction, leading to synaptic failure in Alzheimer's disease (AD). Considering presynaptic high energy demand and tight Ca2+ regulation, impairment of mitochondrial function can lead to deteriorated neural activity and cell death. In this study, an AD mouse model induced by ICV (intracerebroventricular) injection of AβOs was used to investigate the toxicity of AβOs on presynaptic function. As a therapeutic approach, GUO (guanosine) was given by oral route to evaluate the neuroprotective effects on this AD model. Following 24 h and 48 h from the model induction, behavioral tasks and biochemical analyses were performed, respectively. AβOs impaired object recognition (OR) short-term memory and reduced glutamate uptake and oxidation in the hippocampus. Moreover, AβOs decreased spare respiratory capacity, reduced ATP levels, impaired Ca2+ handling, and caused mitochondrial swelling in hippocampal synaptosomes. Guanosine crossed the BBB, recovered OR short-term memory, reestablished glutamate uptake, recovered mitochondrial Ca2+ homeostasis, and partially prevented mitochondrial swelling. Therefore, this endogenous purine presented a neuroprotective effect on presynaptic mitochondria and should be considered for further studies in AD models.
journal_name
Mol Neurobioljournal_title
Molecular neurobiologyauthors
da Silva JS,Nonose Y,Rohden F,Lukasewicz Ferreira PC,Fontella FU,Rocha A,Brochier AW,Apel RV,de Lima TM,Seminotti B,Amaral AU,Galina A,Souza DOdoi
10.1007/s12035-020-02064-4subject
Has Abstractpub_date
2020-11-01 00:00:00pages
4790-4809issue
11eissn
0893-7648issn
1559-1182pii
10.1007/s12035-020-02064-4journal_volume
57pub_type
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