Abstract
Amyloid-β (Aβ) peptides play a significant role in the pathogenesis of Alzheimer’s disease (AD). Neurotoxic effects promoted by Aβ peptides involve glutamate transmission impairment, decrease of neurotrophic factors, mitochondrial dysfunction, oxidative stress, synaptotoxicity, and neuronal degeneration. Here, we assessed the early events evoked by Aβ1–40 on the hippocampus. Additionally, we sought to unravel the molecular mechanisms of atorvastatin preventive effect on Aβ-induced hippocampal damage. Mice were treated orally (p.o.) with atorvastatin 10 mg/kg/day during 7 consecutive days before the intracerebroventricular (i.c.v.) infusion of Aβ1–40 (400 pmol/site). Twenty-four hours after Aβ1–40 infusion, a reduced content of mature BDNF/proBDNF ratio was observed in Aβ-treated mice. However, there is no alteration in synaptophysin, PSD-95, and doublecortin immunocontent in the hippocampus. Aβ1–40 promoted an increase in reactive oxygen species (ROS) and nitric oxide (NO) generation in hippocampal slices, and atorvastatin prevented this oxidative burst. Mitochondrial OXPHOS was measured by high-resolution respirometry. At this time point, Aβ1–40 did not alter the O2 consumption rates (OCR) related to phosphorylating state associated with complexes I and II, and the maximal OCR. However, atorvastatin increased OCR of phosphorylating state associated with complex I and complexes I and II, maximal OCR of complexes I and II, and OCR associated with mitochondrial spare capacity. Atorvastatin treatment improved mitochondrial function in the rodent hippocampus, even after Aβ infusion, pointing to a promising effect of improving brain mitochondria bioenergetics. Therefore, atorvastatin could act as an adjuvant in battling the symptoms of AD to preventing or delaying the disease progression.
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Abbreviations
- Aβ:
-
Amyloid-beta
- Aβ1–40 :
-
Amyloid-beta1–40 peptide
- AD:
-
Alzheimer’s disease
- Ator:
-
Atorvastatin
- BDNF:
-
Brain-derived neurotrophic factor
- ETS:
-
Electron transport system
- HMG-CoA:
-
hydroxy-methylglutaryl-CoA
- i.c.v.:
-
Intracerebroventricular
- NMDA:
-
N-methyl-D-aspartate
- NO:
-
Nitric oxide
- NOS2:
-
Inducible nitric oxide synthase
- OCR:
-
Oxygen consumption rate
- OXPHOS:
-
Mitochondrial oxidative phosphorylation
- Δψmit:
-
Mitochondrial membrane potential
- PSD-95:
-
Postsynaptic protein of 95 kDaltons
- ROS:
-
Reactive oxygen species.
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This research is supported by grants from the Brazilian funding agencies: FAPESC (Fundação de Amparo à Pesquisa e Inovação do Estado de Santa Catarina) and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) – INCT for Excitotoxicity and Neuroprotection; Universal 401065/2014-6; CNPq Productivity Fellowship. G.M. is recipient of post-doctoral fellowship from CNPq (154859/2018-4), and W.C.M. was recipient of a PhD fellowship from CAPES.
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Mancini, G., Martins, W.C., de Oliveira, J. et al. Atorvastatin Improves Mitochondrial Function and Prevents Oxidative Stress in Hippocampus Following Amyloid-β1–40 Intracerebroventricular Administration in Mice. Mol Neurobiol 57, 4187–4201 (2020). https://doi.org/10.1007/s12035-020-02026-w
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DOI: https://doi.org/10.1007/s12035-020-02026-w