Tocotrienols, the vitamin E of the 21st century: Its potential
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Potential Benefits of Palm Tocotrienols in Neurodegenerative Diseases and Dementia
Yuen Kah Hay Ph.DSchool of Pharmaceutical Sciences
Universiti Sains Malaysia11800, Penang
Malaysia
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“You, your joys and sorrows, memories and ambitions, sense ofpersonal identity and free will, are in fact no more than the behaviourof a vast assembly of nerve cells and their associated molecules”Francis Crick (1916 – 2004)
Sir Francis Crick (1916 – 2004)
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The assembly of nerve cells = brain
Requires high amount of energy for its normal functions
Nourished by an intricate and extensive network of blood vessels
Adapted from http://science.nationalgeographic.com/science/photos/brain/ & http://biobotsprinters.tumblr.com/
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Fragile vascular network
Aging, as well as Cerebral Small Vessel Disease(SVD) can lead to damageand structural changes of the finevascular network
Consequent hypo-perfusion will lead to injuryand degeneration of affected brain tissues
A common manifestation of SVD is white matter lesions (WMLs)
Pathological findings include loss of myelin and axons, and fiber degeneration (Debette and Markus(2010), BMJ;341:c3666)
Risk factors include hypertension, diabetes, hyperlipidemia
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White matter lesions (WMLs) associated with many neurodegenerative diseases cognitive decline and dementia (Pantoni et al, 2007, Curr Opin
Neurol., 20: 390-97)
dementia in Parkinson’s Disease (Perea et al, 2013, J AD and Parkinsonism)
progression of Alzheimer’s Disease ( Prasad et al, 2011, Dement Geriatr Cogn Disord; 31:431-434)
Progression of WMLs found to correlate with a decline in cognitive performance (Schmidt et al, 2007, Stroke, 38: 2619-25)
WMLs have become a predictor of cognitive decline and dementia including stroke and death(Jokinen et al, 2005, J NeurolNeurosurg Psychiatry, 76:1229-33; Debette & Markus, 2010, BMJ, 341::c3666 )
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Dementia is a growing worldwide problem:because we live longer
Life expectancy in different regions
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Source: http://www.worldlifeexpectancy.com/country-health-profile/malaysia
MALAYSIA LIFE EXPECTANCY HISTORY
World Rank
Male Female All
1960 52.8 55.9 54.3
1970 60.0 63.2 61.6
1980 65.0 68.8 66.9
1990 68.2 72.5 70.3
2000 70.3 75.1 72.6
2011 71.7 76.4 73.9
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“In 2012, 4.62 million people aged >65yrs suffer from dementia and number is 8.62 million if it includes people with mild cognitive disorders”
“10,000 people with dementia were reported missing after wandering from home each year”
12 November 2014
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Pharmacologic treatment of dementia
Common agents include cholinesterase inhibitors and NMDA glutamate receptor agonist
They are mainly indicated for dementia due to AD, but have many side effects
Eg, Tacrine can cause liver toxicity and was withdrawn in the US
Treatment with these agents initiated only after onset of dementia and not for prophylactic use
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Better approach
To prevent or mitigate cerebral damage/injury of the central nervous tissues
Palm vitamin E tocotrienols can have a role in the preventive treatment of such neurodegenerative disorders which lead to cognitive dysfunction or dementia
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Vitamin E consists of 8 isoforms
4 tocopherols 4 tocotrienols
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Vitamin E in general Essential for normal functions and health of our
nervous system
Recent studies showed tocotrienols but not tocopherols also possess neuroprotective effects
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Neuroprotective property of tocotrienols
α-tocotrienol but not α-tocopherol at nM conc shown to protect neurons from degenerating when challenged with glutamate (Sen et al, 2000)
Through attenuating excitotoxic effects of glutamate by modulating chemical signals within the neuronal cells:
By suppressing C-src kinase(Sen et al 2000) and 12-LOX as well as inhibition of phospholipase A2 activation during glutamate induced excitotoxicity( Khanna et al 2003, 2010)
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Later rodent study by Khanna et al (2005)
Stroke induced in rats with andwithout T3 supplementation
Brain lesions of treated animalssignificantly smaller than matchedcontrols after induction of stroke
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More recent canine study by Rink et al (2011)
Stroke induced in dogs with and without mixed T3 supplementation
Again, lesion volume significantly smaller with mixed tocotrienol supplementation
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Another significant finding Mixed T3 reported to increase cerebrovascular blood flow to
the ischemic zone via induction of arteriogenic genes ! This can significantly reduce injury of brain tissues and hence
alter the clinical course and outcome of the stroke
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Ultimate proof will be evidence from human studies
Hence we conducted a human trial using volunteers with white matter lesions
Thus, cell based and animal studies providedconvincing evidence that the tocotrienolsare neuroprotective
( http://clinicaltrials.gov/ct2/show/NCT00753532)
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Study design
121 subjects with MRI confirmed WMLs recruited
Randomised 200mg of mixed tocotrienols (TocovidSuprabio) twice daily or placebo
MRI at baseline, repeated at 1 year and 2 years
Followed up every 3 months for blood chemistry
Study: double-blind placebo controlled
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Imaging performed using our university MRI
Yoghes
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samples of MRI images (top=normal, bottom with WMLs)
axial coronal sagittal
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Results
121 recruited (T3 = 62, placebo = 59)
109 completed 1 year
88 completed 2 years
Data analyzed according to
-per protocol (n=88)
-intention to treat principles (n = 121)
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Mean volume of lesions(mm3) at baseline, Yr 1, Yr 2
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
Baseline Year 1 Year 2
Placebo (n=42)
T3 (n=46)
per protocolN = 88
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Average change in volume of lesions from baseline (mm3)
172
381
10
-29
-200
-100
0
100
200
300
400
500
600
Placebo (n=42)
T3 (n=46)
YEAR 2YEAR 1
per protocolN = 88
p< 0.05
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Mean volume of lesions(mm3) at baseline, Yr 1, Yr2
(59)
(62)
intention to treatN = 121
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122
270
-17-46
-200
-100
0
100
200
300
400
Placebo (n=59)T3 (n=62)
*P<0.05
Year 1 Year 2
Average change in volume of lesions from baseline (mm3)
intentionto treat
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SummaryThe results demonstrated that the tocotrienols are neuroprotective and could attenuate the progression of white matter lesions
Neuroprotective effects can help reduce tissue injury during an acute ischemic event and hence influence the functional outcomes and clinical course of an acute stroke.
Ability to attenuate progression of WMLs has a beneficial role in the preventive management of neurodegenerative disorders associated with cognitive impairment or dementia
Tocotrienols are not drugs but natural vitamin E isoforms, safe to be taken as a long term neuroprotective supplement
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Mangialasche et al from Karolinska Institute
High plasma levels of total vitamin E (tocopherols and tocotrienols) are associated with reduced risks of AD in advanced age (Mangialasche et al, 2010, J Alzheimer’s Disease; 20:1029-1037)
Low plasma levels of tocopherols and tocotrienols are associated with increased odds of MCI and AD (Mangialascheet al, 2012, Neurobiology of Aging; 33:2282-2290)
Elevated levels of tocopherols and tocotrienols are associated with reduced risk of CI in a cohort of older Finnish adults ( Mangialasche et al, 2013, Experimental Gerontology, 48(12): 1428-14350
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Other team members of WMLs study
Prof Ibrahim Lutfi Shuaib, FRCR Assoc Prof Dr Nurzalina AK Khan, Ph.DDr Yogheswaran Gopalan, Ph.DDr Mukhtar Alam Ansari, Ph.DDr Liong Wei Chuen, FRCRDr Wong Jia woei, Ph.DDr Enrico Magosso, Ph.DDr Mohd Rizal Abu Bakar, MDDr Kalyana Sundram, Ph.DDr Ng Bee Hong, Ph.DDr Chinna Karuthan, Ph.D
Acknowledgeassistance frommy other postgradstudents
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Studies with C. elegans model
Microscopic worm, 1mm in length Lifespan 15 – 30 days Transgenic variants can
express β-amyloid peptideassociated with Alzheimer’sDisease
Worm becomes paralysed, head last to get paralysed
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-20
0
20
40
60
80
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0 5 10 15 20 25 30 35
16°C
20°C
25°C
Lifespan at different temperatures
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Cultured at 16 degrees CCultured at 25 degrees C
A hectic lifestyle is detrimental to health
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Effect of tocotrienols on the lifespan of C. elegans (16 °C)
-20
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4 5 6 7 8 9 10 11 12 14 16 18 20 22 26 30
% s
urv
ival
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control
Mixedtocotrienols- 100 µg/ml
α-Tocopherol -100 µg/ml
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Protective effects of tocotrienols against UVB irradiation
-20.0
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urv
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Control
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α-tocopherol
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Transgenic worm that can express β-amyloid peptide associated with Alzheimer’s Disease
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Effects of mixed tocotrienols in protecting the C. elegansagainst β-amyloid toxicity (Aβ3-42)
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No
t P
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Time (hours)
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Mixed Tocotrienols- 100 µg/ml
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0.0
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Effects of mixed tocotrienols in protecting the C. elegans against β-amyloid1-42 toxicity
Control
1% Mixed Tocotrienols
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Lets pray, we will all grow old gracefully with our mental faculties intact, so that we can enjoy our golden years…
and not become a burden to our children, family and society.
Palm vitamin E tocotrienols may be the answer to our prayers…
Some final words……
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I am having such fabulous time here……
all my friends in heaven will think I didn’t make it !!
http://www.bing.com/images/search?q=Happy+Birthday+Motorcycle+Mama&view=detailv2&&&id=3886853C7506F56B53CAE67CB2CE1E8CF347EEE6&selectedIndex=0&ccid=RiX70TeD&simid=608023900628451604&thid=JN.SSgueqo3hrzEhlmqKGeh8w&ajaxhist=0
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Thank Youfor yourattention
“In god I trust,all others musthave evidence”
Confucius