Abstract
The present report evaluates the effect of global perinatal asphyxia on several parameters of oxidative stress and cell viability in rat brain tissue sampled at an extended neonatal period up to 14 days, a period characterised by intensive neuritogenesis, synaptogenesis, synaptic consolidation, pruning and delayed cell death. Perinatal asphyxia was induced by immersing foetus-containing uterine horns removed by a caesarean section from on term rat dams into a water bath at 37 °C for 21 min. Asphyxia-exposed and sibling caesarean-delivered foetuses were manually resucitated and nurtured by surrogate dams for 1 to 14 postnatal (P) days. Brain samples (mesencephalon, telencephalon and hippocampus) were assayed for glutathione (reduced and oxidated levels; spectrophotometry), tissue reducing capacity (potassium ferricyanide reducing assay, FRAP), catalase (the key enzyme protecting against oxidative stress and reactive oxygen species, Western blots and ELISA) and cleaved caspase-3 (the key executioner of apoptosis, Western blots) levels. It was found that global PA produced a regionally specific and sustained increase in GSSG/GSH ratio, a regionally specific decrease in tissue reducing capacity and a regionally and time specific decrease of catalase activity and increase of cleaved caspase-3 levels. The present study provides evidence for regionally impaired redox homeostasis in the brain of rats subjected to global PA, an effect observed up to P14, mainly affecting mesencephalon and hippocampus, suggesting a sustained oxidative stress after the posthypoxia period. The oxidative stress observed postnatally can in part be associated to a respiratory apneic-like deficit, since there was a statistically significant decrease in respiration frequency in AS compared to CS neonates, also up to P14, together with the signs of a decreased peripheral blood perfusion (pink-blue skin colour in AS, compared to the pink colour observed in all CS neonates). It is proposed that PA implies a long-term metabolic insult, triggered by the length of hypoxia, the resuscitation/reoxigenation manoevres, but also by the developmental stage of the affected brain regions, and the integrity of cardiovascular and respiratory physiological functions, which are fundamental for warrantying a proper development.
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Abbreviations
- ADP/ATP ratio :
-
Adenosine diphosphate/adenosine triphosphate ratio
- a.u.:
-
Arbitrary units
- AS:
-
Asphyxia-exposed rats
- BCA:
-
Bicinchoninic acid assay
- Bcl-2:
-
Protooncogen Bcl-2 (B cell lymphoma 2)
- β-NADPH:
-
β-Nicotinamide adenine dinucleotide 2′-phosphate
- C:
-
Cerebellum
- Cdk:
-
Cyclin-dependent kinase
- CNS:
-
Central nervous system
- CS:
-
Caesarean-delivered rat controls
- DTNB:
-
5, 5′-Dithio-bis-[2-nitrobenzoic acid]
- EDTA:
-
Ethylenediaminetetraacetic acid
- EGTA:
-
Ethylene glycol-bis (β-aminoethyl ether)-N, N, N′, N′-tetraacetic acid
- ELISA:
-
Enzyme-linked immunosorbent assay
- FRAP:
-
Ferric reducing antioxidant power
- Fe+2 :
-
Iron in oxidation state +2
- GSH:
-
Reduced glutathione
- GSSG:
-
Oxidised glutathione
- G22:
-
Gestation day 22
- H2O2 :
-
Hydrogen peroxide
- HIE:
-
Hypoxic-ischemia encephalopathy
- HI:
-
Hypoxic-ischemic
- HRP:
-
Horseradish peroxidase
- H2Od:
-
Destilated water
- L:
-
Liver
- O2 :
-
Oxygen
- PA:
-
Perinatal asphyxia
- PB:
-
Pink-blue
- PKC:
-
Protein kinase C
- P:
-
Postnatal day
- PMSF:
-
Phenylmethylsulfonyl fluoride
- RIPA Buffer:
-
Radio-immune precipitation assay buffer
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
- SDS:
-
Sodium dodecyl sulfate
- SEM:
-
Standard error of the mean
- TUNEL:
-
Terminal deoxynucleotidyl transferase dUTP nick end labeling
- WB:
-
Western blots
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Contract grant sponsors: FONDECYT-Chile (#1120079; 1180042). CONICYT Operacional Support 21140281. LRC (#21140281), TBA (#21151232), PLR (#21130739), are CONICYT-Chile fellows. VV (UCH074; MECESUP-Chile).
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All procedures were conducted in accordance with the animal care and use protocol established by a Local Ethics Committee for experimentation with laboratory animals at the Medical Faculty, University of Chile (Protocol CBA# 0722 FMUCH) and by an ad-hoc commission of the Chilean Council for Science and Technology Research (CONICYT), endorsing the principles of laboratory animal care (NIH; No. 86-23; revised 1985). Animals were permanently monitored (on 24 h basis) regarding wellbeing, following the ARRIVE guidelines for reporting animal studies (www.nc3rs.org.uk/ARRIVE).
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Lespay-Rebolledo, C., Perez-Lobos, R., Tapia-Bustos, A. et al. Regionally Impaired Redox Homeostasis in the Brain of Rats Subjected to Global Perinatal Asphyxia: Sustained Effect up to 14 Postnatal Days. Neurotox Res 34, 660–676 (2018). https://doi.org/10.1007/s12640-018-9928-9
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DOI: https://doi.org/10.1007/s12640-018-9928-9