The effects of palm oil tocotrienol-rich fraction supplementation on biochemical parameters, oxidative stress and the vascular wall of streptozotocin-induced diabetic rats
Clinics
;
64(3): 235-244, 2009. graf, tab, ilus
Article
in English
| LILACS
| ID: lil-509429
ABSTRACT
OBJECTIVE:
This study examined the effects of palm oil tocotrienol-rich fractions on streptozotocin-induced diabetic rats.METHODS:
Animals were divided into three groups (i) normal non-diabetic (NDM), (ii) diabetic treated (tocotrienol-rich fractions - TRF) and (iii) diabetic untreated (non-TRF). The treatment group received oral administration of tocotrienol-rich fractions (200 mg/kg body weight) daily for eight weeks. The normal non-diabetic and the diabetic untreated groups were fed standard rat feed. Blood glucose and lipid profiles, oxidative stress markers and morphological changes of the thoracic aorta were evaluated.RESULTS:
Tocotrienol-rich fractions treatment reduced serum glucose and glycated hemoglobin concentrations. The tocotrienol-rich fractions group also showed significantly lower levels of plasma total cholesterol, low-density lipoprotein cholesterol, and triglyceride, as compared to the untreated group. The tocotrienol-rich fractions group had higher levels of high-density lipoprotein cholesterol, as compared to the untreated group. Superoxide dismutase activity and levels of vitamin C in plasma were increased in tocotrienol-rich fractions-treated rats. The levels of plasma and aorta malondealdehyde + 4-hydroxynonenal (MDA + 4-HNE) and oxidative DNA damage were significant following tocotrienol-rich fractions treatment. Electron microscopic examination showed that the normal morphology of the thoracic aorta was disrupted in STZ-diabetic rats. Tocotrienol-rich fractions supplementation resulted in a protective effect on the vessel wall.CONCLUSION:
These results show that tocotrienol-rich fractions lowers the blood glucose level and improves dyslipidemia. Levels of oxidative stress markers were also reduced by administration of tocotrienol-rich fractions. Vessel wall integrity was maintained due to the positive effects mediated by tocotrienol-rich fractions.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Aorta, Thoracic
/
Plant Oils
/
Oxidative Stress
/
Tocotrienols
/
Diabetes Mellitus, Experimental
/
Antioxidants
Limits:
Animals
Language:
English
Journal:
Clinics
Journal subject:
Medicine
Year:
2009
Type:
Article
Affiliation country:
Malaysia
Institution/Affiliation country:
Institute for Medical Research/MY
/
Universiti Kebangsaan Malaysia/MY
/
Universiti Kebangsaan/MY
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