Antioxidant effects of tocotrienols in patients with hyperlipidemia and carotid stenosis.
Antioxidants may have a role in the prevention of atherosclerosis. In the present trial, we investigated the antioxidant properties of Palm Vitee, a gamma-tocotrienol-, and alpha-tocopherol enriched fraction of palm oil, in patients with carotid atherosclerosis. Serum lipids, fatty acid peroxides, platelet aggregation and carotid artery stenosis were measured over an 18-month period in fifty patients with cerebrovascular disease. Change in stenosis was measured with duplex ultrasonography. Ultrasound scans were done at six months, twelve months, and yearly thereafter. Bilateral duplex ultrasonography revealed apparent carotid atherosclerotic regression in seven and progression in two of the 25 tocotrienol patients, while none of the control group exhibited regression and ten of 25 showed progression (P < 0.002). Serum thiobarbituric acid reactive substances, an ex vivo indicator of maximal platelet peroxidation, decreased in the treatment group from 1.08 +/- 0.70 to 0.80 +/- 0.55 microM/L (P < 0.05) after 12 mon, and in the placebo group, they increased nonsignificantly from 0.99 +/- 0.80 to 1.26 +/- 0.54 microM/L. Both tocotrienol and placebo groups displayed significantly attenuated collagen-induced platelet aggregation responses (P < 0.05) as compared with entry values. Serum total cholesterol, low density lipoprotein cholesterol, and triglyceride values remained unchanged in both groups, as did the plasma high density lipoprotein cholesterol values. These findings suggest that antioxidants, such as tocotrienols, may influence the course of carotid atherosclerosis.
Tomeo
A C
AC
Kenneth L. Jordan Research Group, Montclair, New Jersey 07042, USA.
Geller
M
M
Watkins
T R
TR
Gapor
A
A
Bierenbaum
M L
ML
D000255:Adenosine Triphosphate / Q000097:blood; D000368:Aged; D000369:Aged, 80 and over; D000975:Antioxidants / Q000627:therapeutic use*; D016893:Carotid Stenosis / Q000097:blood / Q000188:drug therapy*; D002839:Chromans / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D006949:Hyperlipidemias / Q000097:blood / Q000188:drug therapy*; D015227:Lipid Peroxidation; D008055:Lipids / Q000097:blood; D008297:Male; D008875:Middle Aged; D000073878:Palm Oil; D010938:Plant Oils / Q000627:therapeutic use*; D010974:Platelet Aggregation; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D014810:Vitamin E / Q000031:analogs & derivatives* / Q000097:blood / Q000627:therapeutic use
D000975:Antioxidants; D002839:Chromans; D008055:Lipids; D010938:Plant Oils; D017392:Thiobarbituric Acid Reactive Substances; D014810:Vitamin E; C013649:plastochromanol 8; D000073878:Palm Oil; D000255:Adenosine Triphosphate