Neuroprotective properties of the natural vitamin E alpha-tocotrienol.

Abstract:

BACKGROUND AND PURPOSE:The current work is based on our previous finding that in neuronal cells, nmol/L concentrations of alpha-tocotrienol (TCT), but not alpha-tocopherol (TCP), blocked glutamate-induced death by suppressing early activation of c-Src kinase and 12-lipoxygenase. METHODS:The single neuron microinjection technique was used to compare the neuroprotective effects of TCT with that of the more widely known TCP. Stroke-dependent brain tissue damage was studied in 12-Lox-deficient mice and spontaneously hypertensive rats orally supplemented with TCT. RESULTS:Subattomole quantity of TCT, but not TCP, protected neurons from glutamate challenge. Pharmacological as well as genetic approaches revealed that 12-Lox is rapidly tyrosine phosphorylated in the glutamate-challenged neuron and that this phosphorylation is catalyzed by c-Src. 12-Lox-deficient mice were more resistant to stroke-induced brain injury than their wild-type controls. Oral supplementation of TCT to spontaneously hypertensive rats led to increased TCT levels in the brain. TCT-supplemented rats showed more protection against stroke-induced injury compared with matched controls. Such protection was associated with lower c-Src activation and 12-Lox phosphorylation at the stroke site. CONCLUSIONS:The natural vitamin E, TCT, acts on key molecular checkpoints to protect against glutamate- and stroke-induced neurodegeneration.

journal_name

Stroke

journal_title

Stroke

authors

Khanna S,Roy S,Slivka A,Craft TK,Chaki S,Rink C,Notestine MA,DeVries AC,Parinandi NL,Sen CK

doi

10.1161/01.STR.0000181082.70763.22

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

2258-64

issue

10

eissn

0039-2499

issn

1524-4628

pii

01.STR.0000181082.70763.22

journal_volume

36

pub_type

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