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The Long-Term Impairment in Redox Homeostasis Observed in the Hippocampus of Rats Subjected to Global Perinatal Asphyxia (PA) Implies Changes in Glutathione-Dependent Antioxidant Enzymes and TIGAR-Dependent Shift Towards the Pentose Phosphate Pathways: Effect of Nicotinamide

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Abstract

We have recently reported that global perinatal asphyxia (PA) induces a regionally sustained increase in oxidized glutathione (GSSG) levels and GSSG/GSH ratio, a decrease in tissue-reducing capacity, a decrease in catalase activity, and an increase in apoptotic caspase-3-dependent cell death in rat neonatal brain up to 14 postnatal days, indicating a long-term impairment in redox homeostasis. In the present study, we evaluated whether the increase in GSSG/GSH ratio observed in hippocampus involves changes in glutathione reductase (GR) and glutathione peroxidase (GPx) activity, the enzymes reducing glutathione disulfide (GSSG) and hydroperoxides, respectively, as well as catalase, the enzyme protecting against peroxidation. The study also evaluated whether there is a shift in the metabolism towards the penthose phosphate pathway (PPP), by measuring TIGAR, the TP53-inducible glycolysis and apoptosis regulator, associated with delayed cell death, further monitoring calpain activity, involved in bax-dependent cell death, and XRCC1, a scaffolding protein interacting with genome sentinel proteins. Global PA was induced by immersing fetus-containing uterine horns removed by a cesarean section from on term rat dams into a water bath at 37 °C for 21 min. Asphyxia-exposed and sibling cesarean-delivered fetuses were manually resuscitated and nurtured by surrogate dams. Animals were euthanized at postnatal (P) days 1 or 14, dissecting samples from hippocampus to be assayed for glutathione, GR, GPx (all by spectrophotometry), catalase (Western blots and ELISA), TIGAR (Western blots), calpain (fluorescence), and XRCC1 (Western blots). One hour after delivery, asphyxia-exposed and control neonates were injected with either 100 μl saline or 0.8 mmol/kg nicotinamide, i.p., shown to protect from the short- and long-term consequences of PA. It was found that global PA produced (i) a sustained increase of GSSG levels and GSSG/GSH ratio at P1 and P14; (ii) a decrease of GR, GPx, and catalase activity at P1 and P14; (iii) a decrease at P1, followed by an increase at P14 of TIGAR levels; (iv) an increase of calpain activity at P14; and (v) an increase of XRCC1 levels, but only at P1. (vi) Nicotinamide prevented the effect of PA on GSSG levels and GSSG/GSH ratio, and on GR, GPx, and catalase activity, also on increased TIGAR levels and calpain activity observed at P14. The present study demonstrates that the long-term impaired redox homeostasis observed in the hippocampus of rats subjected to global PA implies changes in GR, GPx, and catalase, and a shift towards PPP, as indicated by an increase of TIGAR levels at P14.

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Abbreviations

Ac-LLY-AFC:

Ac-Leu-Leu-Tyr-7-amino-4-trifluoromethylcoumarin

AFC:

7-amino-4-trifluoromethylcoumarin

AIF:

Apoptosis inducing factor

AS:

Asphyxia-exposed rats

a.u.:

Arbitrary units

Bax:

Bcl-2 associated X protein apoptosis regulator

Bid:

BH3 interacting domain death agonist

BCA:

Bicinchoninic acid

BSA:

Bovine serum albumin

C:

Cerebellum

CS:

Control saline rats

DTNB:

5, 5′-Dithio-bis-[2-nitrobenzoic acid]

DTT:

Dithiothreitol

ΔA:

Changes in absorbance per minute

EDTA:

Ethylenediaminetetraacetic acid

EGTA:

Ethylene glycol-bis (β-aminoethylether)-N, N, N′, N′-tetraacetic acid

ELISA:

Enzyme-linked immunosorbent assay

GPx:

Glutathione peroxidase

GR:

Glutathione reductase

GSH:

Reduced glutathione

GSSG:

Oxidized glutathione

G22:

Gestation day 22

HI:

Hypoxic-ischemic

HIE:

Hypoxic-ischemia encephalopathy

HRP:

Horseradish peroxidase

H2O2 :

Hydrogen peroxide

H2Od:

Distillated water

HK2:

Hexokinase 2

i.p:

Intraperitoneal injection

IgG (H + L):

Immunoglobulin type G (Heavy + Light chains)

mU/mL:

Milliunits enzymatic per milliliter

NaCl:

Sodium chloride

NAD+ :

Oxidized nicotinamide adenine dinucleotide

NADH:

Reduced nicotinamide adenine dinucleotide

NADP+ :

Oxidized β-Nicotinamide adenine dinucleotide 2′-phosphate

NADPH:

Reduced β-Nicotinamide adenine dinucleotide 2′-phosphate

NADK:

NAD+ kinase

NaF:

Sodium fluoride

NAMPT:

Nicotinamide phosphoribosyltransferase

Nico:

Nicotinamide

NMNAT:

Nicotinamide mononucleotide adenyltransferase

NMN:

Nicotinamide mononucleotide

PA:

Perinatal asphyxia

PARP1:

Poly(ADP-ribose) polymerase 1

PBS:

Phosphate buffer saline

PK:

Pyruvate kinase

PMSF:

Phenylmethylsulfonyl fluoride

PFK1:

Phosphofructokinase 1

PPP:

Pentose phosphate pathway

P:

Postnatal day

TP53:

Tumor protein p53

p53:

Cellular tumor antigen p53

RE:

Reticulum endoplasmic

RIPA:

Radio-immune precipitation assay buffer

ROS:

Reactive oxygen species

R5P:

Ribulose-5-phosphate

SEM:

Standard error of the means

SOD:

Superoxide dismutase

SDS:

Sodium dodecyl sulfate

SDS-PAGE:

Sodium dodecyl sulfate polyacrylamide gel

SSBR:

Single-strand break DNA

TIGAR:

TP53-induced glycolysis and apoptosis regulator

Tris-HCl:

Tris(hydroxymethyl)aminoethane-chloride acid buffer

TBST:

Tris-buffered saline containing 0.1% Tween-20

TNF-alpha:

Tumor necrosis factor alpha

U/ml:

Units enzymatic per milliliter

Veh:

Vehicle

WB:

Western blots

XIAP:

X-linked inhibitor of apoptosis protein

XRCC1:

X-ray repair cross-complementing protein 1

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Acknowledgements

Contract grant sponsors: FONDECYT-Chile (no. 1120079, MHM; 1180042, YI, PMR, MHM; 1190562, PMR). CONICYT Operational Support no. 21140281 (LRC) and no. 21151232 (TBA). CONICYT-Chile fellowships: no. 21140281 (LRC) and no. 21151232 (TBA).

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Correspondence to P. Morales or M. Herrera-Marschitz.

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Ethic statement

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 no. 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 well being, following the ARRIVE guidelines for reporting animal studies (www.nc3rs.org.uk/ARRIVE).

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Lespay-Rebolledo, C., Tapia-Bustos, A., Bustamante, D. et al. The Long-Term Impairment in Redox Homeostasis Observed in the Hippocampus of Rats Subjected to Global Perinatal Asphyxia (PA) Implies Changes in Glutathione-Dependent Antioxidant Enzymes and TIGAR-Dependent Shift Towards the Pentose Phosphate Pathways: Effect of Nicotinamide. Neurotox Res 36, 472–490 (2019). https://doi.org/10.1007/s12640-019-00064-4

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