nutritional modulation of the antioxidant system of the body · vitamin e, carotenoids, ascorbic...
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Nutritional modulation of the antioxidant system of the
bodyPeter Surai, PhD, DSc
Feed-Food. Ltd., Scotland, UKSzent Istvan University, Godollo, HungaryTrakia University, Stara Zagora, Bulgaria
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Free radicals and toxic products of their metabolism
Antioxidant protection
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How many free radicals are produced each day?
• About 1012 O2 molecules processed by each rat cell daily and the leakage of partially reduced oxygen molecules is about 2%, yielding about 2 x1010
molecules of ROS per cell per day (Chance B.,
Sies H. and Boveries A., 1979)• Prof. Bruce Ames has shown that the
DNA in each rat cell is hit by about 100,000 free radicals a day.
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The major cellular target for free radicals
Target Damage Consequence
DNA Scission on deoxyribose ring; base damage; strand breaks; cross-linking
Mutations; translational errors; inhibition of protein synthesis
Protein Aggregation and cross-linking; fragmentation and breakdown; modification of thyol groups
Modified ion transport; increased Ca influx; modified enzyme activity
PUFA Loss of unsaturation; formation of reactive metabolites (e.g. MDA)
Altered membrane fluidity, permeability and activity membrane-bound enzymes
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First level of defence
SODSe-GSH-Px
Catalase Metal-bindingproteins
Second level of defence
Vitamins A, E, C, carotenoids,
Gluta-thione
Uricacid
Third level of defence
Lipases, proteases, etc.
Three major levels of the antioxidant defence in the cell
Free radicalFree radicals
Se-GSH-Px
Free radicals Free radicals
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antioxidantsprooxidants
Antioxidant-prooxidant balance in the cell
Lipid peroxidation and protein oxidation and development of different diseases
Antioxidant protection andmaintenance of good health
Stress conditionsDiet optimization
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Antioxidant team
All antioxidants in the body are working together as a team (antioxidant system), responsible for prevention of damaging effects of free radicals and toxic products of their metabolism
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Nutritional modulation of the antioxidant system
Nutritional modulation of the antioxidant system
Modulation of the antioxidant system of the developing chicken embryo by maternal nutrition can be used as a model system
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Maternal effect of antioxidants
Laying hen
Egg yolk:tocopherols, tocotrienols,
Carotenoids, Se
Embryo: tocopherols,tocotrienols, carotenoids, ascorbic
acid, glutathione, uric acid, coenzyme Q, GSH-Px, SOD
Antioxidants in the diet:vitamin E, carotenoids, ascorbic acid, selenium, flavonoids
Developing chicken: growth, immunity, disease resistance
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Fatty acid composition of egg yolk and liver of newly hatched chick, %
Fatty acid Egg Liver16:0 25.8 16.118:0 8.1 27.518:1n-9 40.5 7.518:1n-7 1.6 0.718:2n-6 14.7 14.620:4n-6 1.7 21.922:6n-3 1.6 10.4
Surai et al., 1999
Total PUFA 18.0 46.9
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Major feed-derived antioxidants
• Vitamin E• Carotenoids• Selenium• Vitamin C• Flavonoids• Essential oils• Other minerals ( Mn, Zn, Cu, Fe)
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Vitamin E Transfer From Feed to Egg Yolk
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0 2 4 6 8 1 12 14 16 18 20 22 24 26 28 30 32 34 36
Days of experimental feeding
alph
a-to
coph
erol
, ug/
g
Surai, 2002
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Relationship Between Vitamin E in the Egg Yolk and Liver
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Vit.
E in
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Vitamin E in the egg yolk, ug/g
Surai, 2002
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Effect of vitamin E in laying hen diet on lipid peroxidation in chick embryo tissues
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Liver YSM Brain Breastmuscles
Legmuscles
Kidney Heart
MD
A, u
g/g/
hour
Surai et al., 2000
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Some target genes regulated at transcriptional level by vitamin E
Gene Class Function Effect of vitamin E
Inflammatory cytokines Inflammation Inhibition
Apoptosis Induction of apoptosis Inhibition
Regulation of transcription
Induction of inflammatory genes Inhibition
Regulation of transcription
Induction of immune response Induction
Antioxidant defence GSH biosynthesis Induction
Detoxification Detoxification of endogenous and exogenous compounds
Induction
Lipid metabolism Lipid uptake, delivery transport Inhibition
Mocchegiani et al., 2014
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Carotenoids
Carotenes Xanthophylls
-carotene-carotene
-cryptoxanthin
LuteinZeaxanthinLycopene
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Canthaxanthin in egg yolk
Surai et al., 2003
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Canthaxanthin in the liver of day old chick
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30-W35-W55-W
Surai et al., 2003
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Effect of canthaxanthin on lipid peroxidation in the liver of newly hatched chicks
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Surai et al., 2003
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Effect of canthaxanthin in the breeder’s diet on the AO system of the day-old chicken, %
Zhang et al., 201159
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Alterations in gene expression in mouse liver after treatment with lutein
Positive regulation + foldchange
Negative regulation - fold change
GSH-Px1 2.12 Glutathione reductase
2.27
Peroxiredoxin-4 2.26 TR1 5.39SOD1 2.37 TR2 2.09Uncoupling protein 3.53 SOD2
(mitochondria)4.77
Nucleoredoxin 2.94 Isocitratedehydrogenase
3.31
Copper chaperon for SOD
5.02 NADPH-oxidase 1.63
Sarpeloni et al., 2014
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15P
39.974
16S
32.06
17Cl
35.45333
As74.922
34
Se78.96
35Br
79.904
51Sb
121.75
52Te
127.60
53I
126.91
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GSH-Px (5 forms)Selenoprotein PSelenoprotein W Antioxidant
defence
Diseases:Muscular dystrophyExudative diathesisPancreatic atrophyEncephalomalaciaImpaired fertility
Iodothyronine5’-deiodinases(3 forms)
Thyroidmetabolism
Poor featheringIncreased cold sensitivity
PH-GSH-Px Sperm structureintegrity
Sperm motility, viabilityand fertilizing capacity
Decreased:egg production,hatchability, chick viability,growth, immunocompetence,meat quality, feed efficiency
Thioredoxin reductases (3 forms)
Redox regulation of gene expression
Methionine sulfoxidereductase B
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Effect of Se in maternal diet on GSH-Px activity in the progeny chicken liver, U/g
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Day 1 Day 7 Day 14 Day 21 Day 28
ControlSe
Pappas et al., 2005
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Effects of different sources of selenium (0.15 ppm) on TrxR1 activity of liver and kidney in broiler breeders (A) and their offspring (B).
(Yuan et al., 2012)Lingnan Yellow broiler breeders, SS-sodium selenite, SM- selenomethionine, SeY- Se-Yeast
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Effect of dietary Se (0.3 ppm) in maternal diet on AO enzymes in muscles of newly-hatched chicks, U/mg protein
(Wang et al., 2011)
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Pathway/function Sodium selenite Se- Yeast
Selenoproteins
Protein synthesis Translation of RNAProtein synthesis and metabolism
Protein synthesis and metabolism
Oxidative phosphorylation
Down Up
Ubiquinone Ubiquinonebiosynthesis
Transcriptional changes in the oviduct in Cobb breeders
(Brennan et al., 2011)Se concentration in oviduct was 0.086; 0.251 and 0.286 mg/kg respectively
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• The mother diet influenced expression of at least 11 gens inthe intestine in the offspring at day 3 and day 14
• Genes that are higher expressed at day 3 and day 14 of age in the chicks of which the mothers received the higher mix are involved in epithelial turnover/ proliferation and maturation of intestinal cells
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• Selenium is an effective regulator of antioxidant system via participation in the synthesis of various selenoproteins
• Effects of Se on gene expression and maintenance of the redox status of the cell need further investigation
• Se efficacy depends on the form of the element in the diet with organic Se (SeMet) being more effective than traditional sodium selenite
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FLAVONOIDS
FLAVONOLS FLAVONES PROANTOCIANIDINS
ISOFLAVONOIDS FLAVANONES
isoflavones coumestansFlavan-3-ols
i.e. catechins
(-)-epicatechin(-)-epigallocatechin
(+)-catechin
genisteindiadzein
formononetinbiochanin A
coumestrol
quercetinkampferol
rutinmyricetingalangin
apigeninluteolin
quercetagetinchrysin
myricetinnaringin
naringeninhesperetin
55
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Antioxidant system
Mynistry of DefenceGene expression and
synthesis of AO enzymes and other antioxidants
Vitamin E and CoQHead-quarter
Vitamin C:Special forces:2 compounds
CAROTENOIDS:Communicating
services> 600
compounds
Flavonoids:POLiCE> 8000
compounds
SeleniumChief-executive
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Antioxidant system maturation in piglets(adapted from Yin et al., 2013)
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Antioxidant system in early (14d) weaned piglets (adapted from Yin et al., 2014)
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StressGSH
Vitagenes AO-enzymes (SOD, GSH-Px, et al.), Chaperones (HSP), sirtuins, etc.
Vit.E-recyclingAO reserves,Co-factors
apoptosis
Immunosupression,decreased reproduction, problems with growth and development
AO-Defences
Stress and Adaptation