Guanosine Neuroprotection of Presynaptic Mitochondrial Calcium Homeostasis in a Mouse Study with Amyloid-ß Oligomers.
Mol Neurobiol
; 57(11): 4790-4809, 2020 Nov.
Article
in En
| MEDLINE
| ID: mdl-32789760
ABSTRACT
Amyloid-ß oligomers (AßOs) 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 AßOs was used to investigate the toxicity of AßOs 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. AßOs impaired object recognition (OR) short-term memory and reduced glutamate uptake and oxidation in the hippocampus. Moreover, AßOs 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.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Calcium
/
Amyloid beta-Peptides
/
Presynaptic Terminals
/
Neuroprotection
/
Guanosine
/
Homeostasis
/
Mitochondria
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Mol Neurobiol
Journal subject:
BIOLOGIA MOLECULAR
/
NEUROLOGIA
Year:
2020
Document type:
Article
Affiliation country: