A derivative of the green tea leaf may help with Metabolic Syndrome X, a potentially deadly disorder

April 09, 2003

April 9, 2003 (San Diego, CA) -- Metabolic Syndrome X is the term used to describe a group of heart disease risk factors, including high levels of abdominal fat, bad cholesterol, high blood pressure, and abnormal glucose metabolism. The syndrome, also known as Insulin Resistance Syndrome, is thought to run in families with a history of type 2 diabetes. It is a syndrome that can kill.

Excessive caloric intake is thought to be one of the root causes. Consequently, physicians have prescribed weight loss, exercise and a healthy diet to combat it. A new weapon might eventually be added to the arsenal: consumption of Tegreen, a tea polyphenols product containing in excess of 65 percent tea catechins, derived from the green tea leaf. The results of a new animal model study reveal the benefits of Tegreen in improving lipid and glucose metabolisms, enhancing insulin sensitivity, and balancing the metabolic rate of fat deposit and fat burning.

The authors of a new study, "Tegreen Improves glucose and lipid metabolism in obese rats that have features similar to Metabolic Syndrome X," are Hong Yu, Zhigang Zhu and Weiti Yin, all of the Pharmanex Beijing Pharmacology Center, Beijing, China; and Jia-Shi Zhu of Pharmanex, LLC, Provo, UT. Dr. Jia-Shi Zhu will present their findings at Experimental Biology 2003, a meeting sponsored by the American Physiological Society, being held April 11-15, 2003, at the San Diego Convention Center, San Diego, CA.

Methodology
Tegreen powder, containing >97 percent tea polyphenols or >65 percent tea catechins, was used with 44 female Sprague-Dawley rats, weighing 190-210 g. A high-dose treatment was developed using Tegreen powder (0.75 g) dissolved in 100 ml of solution for a 7.5 mg/ml suspension. For a low-dose treatment, Tegreen power (0.25 g) was dissolved in solution to make a 2.5 mg/ml suspension.

The subjects were housed with a 12-hour light/dark cycle. After being acclimatized to their surroundings, they were randomly placed in one of four experimental groups. Rats in a normal diet placebo group were fed normal rat forage. The other rats were fed a high-calorie diet, including a high-calorie diet placebo, for a period of 56 days. Two treatment groups were given Tegreen at a dose of 25 or 75 mg/kg. Following fasting of ten hours, orbital blood samples were collected to examine fasting serum glucose, serum triglycerides, plasma insulin, and plasma glucagon. Glucose insulin index and ratio of insulin:Glucagon were calculated. Abdominal adipose tissue was isolated and weighted.

Results
The researchers made the following observations:Conclusions
This study reveals that oral administration of Tegreen is capable of improving glucose and lipid metabolisms in an obese rat model induced by a high-calorie diet. The close association of disordered lipid metabolism with other metabolic disturbances may be the unique feature of Metabolic Syndrome X. This study clearly shows that Tegreen intervention can significantly decrease visceral fat depot and increase the insulin's sensitivity, presumably touching one of the pathological root causes of this potentially deadly syndrome.
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The American Physiological Society (APS) is one of the world's most prestigious organizations for physiological scientists. These researchers specialize in understanding the processes and functions underlying human health and disease. Founded in 1887 the Bethesda, MD-based Society has more than 10,000 members and publishes 3,800 articles in its 14 peer-reviewed journals each year.

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