Herb works like modern-day prescription drugs used to treat diabetes, study suggest

An herb used in traditional Indian medicine to treat diabetes seems to lower blood sugar and insulin levels in a manner similar to prescription drugs, a new study reports.Researchers gave extracts of the herb Salacia oblonga to 39 healthy adults, and the results were promising. The largest dose of the herb extract – 1,000 milligrams – decreased insulin and blood glucose levels by 29 and 23 percent, respectively.

“These kinds of reductions are similar to what we might see with prescription oral medications for people with diabetes,” said Steve Hertzler, a study co-author and an assistant professor of nutrition at Ohio State University.

Salacia oblonga, which is native to regions of India and Sri Lanka, binds to intestinal enzymes that break down carbohydrates in the body. These enzymes, called alpha-glucosidases, turn carbohydrates into glucose, the sugar that circulates throughout the body. If the enzyme binds to the herbal extract rather than to a carbohydrate, then less glucose gets into the blood stream, resulting in lowered blood glucose and insulin levels.

“Lowering blood glucose levels lowers the risk of disease-related complications in people with diabetes,” Hertzler said. “Also, poor compliance with diabetes medications often hinders the effectiveness of these drugs. It may be easier to get someone to take an herb with food or in a beverage, as opposed to a pill.”

The study appears in a recent issue of the Journal of the American Dietetic Association.

Thirty-nine healthy adults participated in four separate meal tolerance tests. These meals, which were given in beverage form, were spaced three to 14 days apart. Each participant fasted for at least 10 hours before consuming the test beverage.

Participants were asked to drink about two cups’ worth of the chilled beverage, which contained zero, 500, 700 or 1,000 milligrams of Salacia oblonga extract. Afterward, the researchers used the finger-prick method to draw blood samples from each person every 15 to 30 minutes for three hours. These blood samples were used to determine insulin and blood glucose concentrations. The biggest changes in blood glucose and insulin levels usually happen within the first two hours after eating.

The beverage that contained the highest concentration of the herbal extract – 1,000 milligrams – provided the most dramatic reduction in insulin and blood glucose levels. Insulin levels were 29 percent lower, while blood glucose levels were 23 percent lower as compared to the control drink, which contained no herbal extract.

As Salacia oblonga can cause intestinal gas, the researchers had the study participants collect breath hydrogen samples hourly for eight hours after drinking the test beverage. The participants collected their breath in small plastic tubes. The researchers then analyzed these breath samples for hydrogen and methane content – the level of either substance in the breath corresponds to the level contained in the colon.

The subjects also rated the frequency and intensity of nausea, abdominal cramping and distention and gas for two days after consuming each test meal.

While the test beverages containing Salacia oblonga caused an increase in breath hydrogen excretion, reports of gastrointestinal discomfort were minimal, Hertzler said.

Right now he and his colleagues are trying to figure out what dose of the herb is most effective, and when it should be taken relative to a meal.

“We want to know how long it takes for the herb to bind to the enzymes that break down carbohydrates,” Hertzler said. “The participants in this study took the herb with their meal, but maybe taking it before eating would be even more effective.”

The researchers also want to study the effects of Salacia oblonga in people with diabetes.

“A lot of studies show that lowering blood sugar levels reduces the risk for all kinds of diabetes-related complications, such as kidney disease and nerve and eye damage,” Hertzler said. “We want to see if this herb has this kind of effect.”

Salacia oblonga is still relatively difficult to find in the United States, Hertzler said, although there are manufacturers that sell the herb through the Internet.

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Article adapted by MD Only Weblog from original press release.
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Contact: Steve Hertzler
Ohio State University

This study was supported by the Ross Products Division of Abbott Laboratories in Columbus.

Hertzler is continuing to conduct Salacia oblonga studies with the Ross Products Division of Abbott Laboratories. He has no links to the company beyond this affiliation.

Hertzler conducted the work with former Ohio State colleague Patricia Heacock, who is now at Rutgers, the State University of New Jersey; Jennifer Williams, a clinical scientist with Ross Products Division, Abbott Laboratories; and Bryan Wolf, a former research scientists with Ross Products Division.

Early diet modification may prevent type 1 diabetes in children

Within the next 10 years the EU-funded Diabetes Prevention study, part of an international study called TRIGR (Trial to Reduce IDDM in the Genetically at Risk), coordinated at the University of Helsinki, Finland, will generate a definite answer to the question whether early nutritional modification may prevent type 1 diabetes later in childhood.

Type 1 diabetes is a growing health problem among European children. European data indicate that the disease incidence has increased five-six-fold among children under the age of 15 years after World War II, and there are no signs that the increase in incidence is levelling off. The most conspicuous increase has been seen among children under the age of 5 years.

The TRIGR study is the first study ever aimed at primary prevention of type 1 diabetes. The study is designed to answer to the question whether excluding cow’s milk protein from the infant’s diet decreases the risk of future diabetes. All subjects are followed for 10 years to get information on whether the dietary recommendations for infants at increased genetic risk of type 1 diabetes should be revised.

Starting in May 2002, 76 study centres from 15 countries (Australia, Canada, the Czech Republic, Estonia, Finland, Germany, Hungary, Italy, Luxembourg, the Netherlands, Poland, Spain, Sweden, Switzerland and USA) have been recruiting families for the study. To be eligible the newborn infant has to have at least one family member (mother, father and/or sib) affected by type 1 diabetes and carry a HLA genotype conferring increased risk for type 1 diabetes. The initial recruitment target of 2032 eligible infants was reached at the be-ginning of September 2006, but the Study Group has decided to continue recruitment till the end of December 2006 (when the EU contribution will finish) to make the study even more powerful statistically.

A majority of the study participants (52%) have been recruited in Europe. The International Coordinating Cen-tre (ICC) is located at the University of Helsinki, Helsinki, Finland and the Data Management Unit (DMU) at the University of South Florida, Tampa, Florida, USA. The trial has logistically been a true challenge for both the ICC and DMU. DMU has been successful in establishing a secure, real-time, web-based, interactive data management system that works extremely well. This system can be directly applied to future international mul-ticentre studies.

The TRIGR study is generating a wealth of information on breast-feeding practices, infant nutrition and growth in young children in various countries. At 2 weeks of age almost all the participating infants were breast-fed. Exclusive breast-feeding continued longer in Europe than in North America. More than one third of the infants (35 %) received other foods in addition to breast milk and/or infant formulas at the age of 4 months, while WHO recommends that supplementary food should be introduced at the earliest by the age of 6 months. In Europe the first foods to be introduced are typically vegetables and fruits, whereas gluten-free cereals are most commonly introduced in North America.

Newborn infants in Northern Europe (NE) had a higher birth weight but a shorter birth length than infants in Central and Southern Europe (CSE). The NE children remained heavier than those from CSE at least up to the age of 18 months. The NE children were also taller than the CSE children starting already from the age of 3 months up to the age of 18 months. Accelerated growth in infancy has been identified as a risk factor for type 1 diabetes later in childhood. Accordingly the observed growth pattern may contribute to the higher incidence of type 1 diabetes in NE compared to CSE.

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Article adapted by MD Only Weblog from original press release.
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Contact: Hans K. Åkerblom
University of Helsinki

More information:
Study websites: http://www.trigr.org

Soft drinks linked to development of diabetes in children

Researchers have found new evidence that soft drinks sweetened with high-fructose corn syrup (HFCS) may contribute to the development of diabetes, particularly in children. In a laboratory study of commonly consumed carbonated beverages, the scientists found that drinks containing the syrup had high levels of reactive compounds that have been shown by others to have the potential to trigger cell and tissue damage that could cause the disease, which is at epidemic levels. HFCS is a sweetener found in many foods and beverages, including non-diet soda pop, baked goods, and condiments. It is has become the sweetener of choice for many food manufacturers because it is considered more economical, sweeter and more easy to blend into beverages than table sugar. Some researchers have suggested that high-fructose corn syrup may contribute to an increased risk of diabetes as well as obesity, a claim which the food industry disputes. Until now, little laboratory evidence has been available on the topic.

In the current study, Chi-Tang Ho, Ph.D., conducted chemical tests among 11 different carbonated soft drinks containing HFCS. He found ‘astonishingly high’ levels of reactive carbonyls in those beverages. These undesirable and highly-reactive compounds associated with “unbound” fructose and glucose molecules are believed to cause tissue damage, says Ho, a professor of food science at Rutgers University in New Brunswick, N.J. By contrast, reactive carbonyls are not present in table sugar, whose fructose and glucose components are “bound” and chemically stable, the researcher notes.

Reactive carbonyls also are elevated in the blood of individuals with diabetes and linked to the complications of that disease. Based on the study data, Ho estimates that a single can of soda contains about five times the concentration of reactive carbonyls than the concentration found in the blood of an adult person with diabetes.

Ho and his associates also found that adding tea components to drinks containing HFCS may help lower the levels of reactive carbonyls. The scientists found that adding epigallocatechin gallate (EGCG), a compound in tea, significantly reduced the levels of reactive carbonyl species in a dose-dependent manner when added to the carbonated soft drinks studied. In some cases, the levels of reactive carbonyls were reduced by half, the researchers say.

“People consume too much high-fructose corn syrup in this country,” says Ho. “It’s in way too many food and drink products and there’s growing evidence that it’s bad for you.” The tea-derived supplement provides a promising way to counter its potentially toxic effects, especially in children who consume a lot of carbonated beverages, he says.

But eliminating or reducing consumption of HFCS is preferable, the researchers note. They are currently exploring the chemical mechanisms by which tea appears to neutralize the reactivity of the syrup.

Ho’s group is also probing the mechanisms by which carbonation increases the amount of reactive carbonyls formed in sodas containing HFCS. They note that non-carbonated fruit juices containing HFCS have one-third the amount of reactive carbonyl species found in carbonated sodas with HFCS, while non-carbonated tea beverages containing high-fructose corn syrup, which already contain EGCG, have only about one-sixth the levels of carbonyls found in regular soda.

In the future, food and drink manufacturers could reduce concerns about HFCS by adding more EGCG, using less HFCS, or replacing the syrup with alternatives such as regular table sugar, Ho and his associates say. Funding for this study was provided by the Center for Advanced Food Technology of Rutgers University. Other researchers involved in the study include Chih-Yu Lo, Ph.D.; Shiming Li, Ph.D.; Di Tan, Ph.D.; and Yu Wang, a doctoral student.

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Article adapted by MD Only Weblog from original press release.
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Contact: Charmayne Marsh
American Chemical Society

The American Chemical Society — the world’s largest scientific society — is a nonprofit organization chartered by the U.S. Congress and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. Its main offices are in Washington, D.C., and Columbus, Ohio.

 

Hope for Diabetics at risk of blindness

Brand new research launched at the British Pharmaceutical Conference in Manchester is bringing hope to hundreds of people with diabetes who lose their sight each year as a side-effect of the disease.

People with diabetes commonly experience blindness, or a reduction in sight, when a lack of oxygen at the back of the eye causes tiny blood vessels to overgrow into the vitreous humour, which is a jelly like substance. This jelly like substance is removed during surgery to treat this problem.

Pharmaceutical researchers at the University of East Anglia have revealed that they are developing an artificial form of this vitreous humour so that it can be replaced following surgery or if it has been damaged or degenerated for other reasons.

Biologist Janine Morris working with Pharmacist Susan Barker and Biologist Julie Sanderson at the School of Chemical Sciences and Pharmacy, University of East Anglia, is identifying the essential characteristics of the human and pig vitreous humour so that they can be mimicked artificially.

She says: “I am currently making a gel that imitates the vitreous humour and which is non-cytotoxic to the human eye. The substance will also include anti-angiogenic drugs to prevent the blood vessels re-growing and the original damage re-occurring.”

Placing this artificial jelly into the damaged eye should certainly improve and potentially restore lost sight. Janine Morris says that the research, which is in the preliminary stages, is good news for diabetes sufferers who will be protected against recurring damage. “The idea that we can potentially improve and maintain sight for diabetes sufferers by replacing the vitreous humour is amazing,” she says.

The vitreous humour is a clear gel-like substance that fills the space between the lens and the retina of the eye. It is 99% water but also contains collagen fibres, inorganic salts, acids and sugar.

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Article adapted by MD Only Weblog from original press release.
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For further information please visit:
The University of East Anglia

Diabetes is the leading cause of blindness among people aged 20-74 in Minnesota. Each year, according to the Minnesota Department of Health (MDH), between 400 and 700 Minnesotans go blind due to diabetes complications. Even when blood sugar is controlled, 60% of those having diabetes for more than 15 years will experience some form of diabetic eye disease in their lifetime.November is American Diabetes Month. This is a good time to schedule your annual dilated eye exam, urges the Minnesota Optometric Association (MOA), because type 2 diabetes can be caught early with this exam, and treated. MDH statistics show that of the 276,000 Minnesotans who have diabetes, 96,000 are unaware that they have it.

Currently, only eight in 10 Minnesotans with diabetes have a dilated eye exam every two years. “Most people do not realize that diabetics are twice as likely to suffer from cataracts, diabetic retinopathy and glaucoma. People may have these diseases before they are aware of it,” said Dr. Dirk Colby, president of the MOA and a doctor of optometry with West Metro Ophthalmology, Golden Valley and Plymouth, Minnesota. “It is critical for diabetic patients to come in every year,” said Dr. Colby. “Waiting two years or even worse, not coming in at all, can have a catastrophic effect.”

Diabetes is taking its toll on Americans and Minnesotans with eye diseases and type 2 diabetes is increasing rapidly due to the increase in obesity and decrease in exercise. These two risk factors are the leading causes of type 2 diabetes.

Diabetic retinopathy, the most common diabetic eye disease, is the leading cause of blindness in Minnesota, and overall in the United States. Diabetic retinopathy is caused by changes in the blood vessels of the retina. In some people with diabetic retinopathy, retinal blood vessels may swell and leak fluid; in others, abnormal new blood vessels grow on the surface of the retina. These changes may result in vision loss or blindness.

Cataracts occur when the normally clear lens in the eye becomes cloudy, impairing vision. Clouded vision may make it more difficult to read, drive, or see clearly. Glaucoma, an increase in fluid pressure inside the eye, leads to optic nerve damage and vision loss.

To help prevent diabetic eye diseases, the American Diabetes Association recommends people suffering from diabetes should:

• Keep your blood sugar under good control. People who keep their blood sugar levels closer to normal are less likely to have retinopathy.
• Bring high blood pressure down. High blood pressure can make eye problems worse.
• Get a dilated eye exam by a family eye doctor every year. Your optometrist will use drops to enlarge your pupils to look inside your eyes.

The Minnesota Optometric Association (MOA) recommends you see your family eye doctor right way if you have any of the following problems:

• Your vision is blurry.
• You see double, spots or floaters
• One or both eyes hurt
• You feel pressure in your eye
• You can’t see things at the periphery as well as before
• You have trouble reading

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Article adapted by MD Only Weblog from original press release.
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Contact:
Jim Meffort-Nelson
minnesota.aoa.org

Overeating disrupts body clock causes weight gain

Our body’s 24-hour internal clock, or circadian clock, regulates the time we go to sleep, wake up and become hungry as well as the daily rhythms of many metabolic functions. The clock — an ancient molecular machine found in organisms large and small, simple and complex — properly aligns one’s physiology with one’s environment.Now, for the first time, a Northwestern University and Evanston Northwestern Healthcare (ENH) study has shown that overeating alters the core mechanism of the body clock, throwing off the timing of internal signals, including appetite control, critical for good health. Animals on a high-fat diet gained weight and suddenly exhibited a disruption in their circadian clocks, eating extra calories during the time they should have been asleep or at rest.

The study, which will be published in the Nov. 7 issue of the journal Cell Metabolism, also shows that changes in metabolic state associated with obesity and diabetes not only affects the circadian rhythms of behavior but also of physiology. Probing beyond the behavioral level, the researchers observed actual changes in genes that encode the clock in the brain and in peripheral tissues (such as fat), resulting in diminished expression of those genes.

These findings close an important loop in studies led by Joe Bass, M.D., assistant professor of medicine and neurobiology and physiology at Northwestern and head of the division of endocrinology and metabolism at ENH, of the relationship between the body clock and metabolism. Two years ago Bass and his colleagues reported in the journal Science that a faulty or misaligned body clock can wreak havoc on the body and its metabolism, increasing the propensity for obesity and diabetes.

Since then, knowing that genetic mutations rarely are the reason for a malfunctioning body clock, Bass has been wondering what could upset the operation of this internal timing device. What are the environmental factors or common influences that might affect the clock and in turn disrupt the sleep/wake cycle”

“Our study was simple — to determine if food itself can alter the clock,” said Bass, senior author of the paper. “The answer is yes, alterations in feeding affect timing. We found that as an animal on a high-fat diet gains weight it eats at the inappropriate time for its sleep/wake cycle — all of the excess calories are consumed when the animal should be resting. For a human, that would be like raiding the refrigerator in the middle of the night and binging on junk food.”

The clock-metabolism cycles feed on each other, creating a vicious loop, says Bass. Once weight gain starts, the clock is disrupted, and a disrupted clock exacerbates the original problem, affecting metabolism negatively and increasing the propensity for obesity and diabetes.

“Timing and metabolism evolved together and are almost a conjoined system,” said Bass. “If we perturb the delicate balance between the two, we see deleterious effects.”

The biological clock is central to behavior and tissue physiology. Clocks function in the brain as well as lung, liver, heart and skeletal muscles. They operate on a 24-hour, circadian (Latin for “about a day”) cycle that governs functions like sleeping and waking, rest and activity, fluid balance, body temperature, cardiac output, oxygen consumption and endocrine gland secretion.

In their study, Bass and his team studied mice with the same genetic backgrounds. After feeding them a regular diet for two weeks, they were split into two groups for the remaining six weeks, one kept on a regular diet and the other fed a high-fat diet. After two weeks, those on the high-fat diet showed a spontaneous shift in their normal pattern of activity/eating and resting/sleeping. They began to eat during their typical rest or sleep period (daylight for a mouse). The animals on a regular diet did not exhibit this behavior.

“It’s not just that the animals are eating more at regular meals,” said Bass. “What’s happened is that they actually shift their eating habits so that all excess food intake occurs during their normal rest period.”

In the study’s high-calorie, high-fat diet, 45 percent of calories was contributed by fat. For humans, a diet with no more than 30 percent of calories from fat is recommended.

The entire study was conducted in darkness so that the behavior of the animals simply reflected their internal clock; a normal animal has a very fixed daily period of just less than 24 hours. For animals on a high-fat diet, after two weeks on that diet the animals’ behavior changed: their daily period of sleep/wake was lengthened by a significant amount. This suggests, says Bass, that the central mechanism in the brain that controls the timing of the cycle of activity and rest is affected by a high-fat diet.

“Our findings have implications for human disease,” said Bass. “These basic advances in science can be applied to the studies of common disorders like obesity and diabetes. It is important to understand what happens when diet changes.”

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Article adapted by MD Only Weblog from original press release.
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Contact: Wendy Leopold
Northwestern University

In addition to Bass, other authors of the paper, titled “High-Fat Diet Disrupts Behavioral and Molecular Circadian Rhythms in Mice,” are Akira Kohsaka, of Northwestern (lead author); Aaron Laposky, research assistant professor at Northwestern’s Center for Sleep and Circadian Biology; Kathryn Moynihan Ramsey, Carmela Estrada and Corrine Joshu, of Northwestern; Yumiko Kobayashi, of Evanston Northwestern Healthcare; and Fred W. Turek, professor of neurobiology and physiology at Northwestern and director of the Center for Sleep and Circadian Biology.

Plant pigment in cherries helps lower sugar levels

Perhaps George Washington wouldn’t have chopped down his father’s cherry tree if he knew what chemists now know. They have identified a group of naturally occurring chemicals abundant in cherries that could help lower blood sugar levels in people with diabetes. In early laboratory studies using animal pancreatic cells, the chemicals, called anthocyanins, increased insulin production by 50 percent, according to a peer-reviewed study scheduled to appear in the Jan. 5 issue of the American Chemical Society’s Journal of Agricultural and Food Chemistry. ACS is the world’s largest scientific society.Anthocyanins are a class of plant pigments responsible for the color of many fruits, including cherries. They also are potent antioxidants, highly active chemicals that have been increasingly associated with a variety of health benefits, including protection against heart disease and cancer.

“It is possible that consumption of cherries and other fruits containing these compounds [anthocyanins] could have a significant impact on insulin levels in humans,” says study leader Muralee Nair, Ph.D., a natural products chemist at Michigan State University in East Lansing. “We’re excited with the laboratory results so far, but more studies are needed.” Michigan is the top cherry producing state in the nation.

Until human studies are done on cherry anthocyanins, those with diabetes should continue following their doctor’s treatment recommendations, including any medicine prescribed, and monitor their insulin carefully, the researcher says. The compounds show promise for both the prevention of type 2 (non-insulin-dependent) diabetes, the most common type, and for helping control glucose levels in those who already have diabetes, he adds.

While fresh cherries and fruits containing these anthocyanins are readily available, medicinal products may be the most efficient way to provide the beneficial compounds, according to Nair. It’s possible that anthocyanins eventually could be incorporated into new products, such as pills or specialty juices that people could take to help treat diabetes. Such disease-specific products may take several more years to develop, he notes.

Scientists in Nair’s laboratory have even developed a unique process, patented by the university, for removing sugar from fruit extracts that contain anthocyanins. This could lead to “sugar-free” medicinal products for people with diabetes.

The current study, partially funded by the U.S. Department of Agriculture, involved tart cherries (also known as sour cherries or pie cherries), a popular variety in the United States, and the Cornelian cherry, which is widely consumed in Europe. Nair and his associates, B. Jayaprakasam, Ph.D., L.K. Olson, Ph.D., and graduate student S. K. Vareed, tested several types of anthocyanins extracted from these cherries against mouse pancreatic-beta cells, which normally produce insulin, in the presence of high concentrations of glucose.

Insulin is the protein produced by the pancreas that helps regulate blood sugar (glucose) levels. Compared to cells that were not exposed to anthocyanins, exposed cells were associated with a 50 percent increase in insulin levels, the researchers say. The mechanism of action by which these anthocyanins boost insulin production is not known, Nair says.

Nair and his colleagues are currently feeding anthocyanins to a group of obese, diabetic mice to determine how the chemicals influence insulin levels in live subjects. Results of these tests are not yet available.

Although other fruits, including red grapes, strawberries and blueberries, also contain anthocyanins, cherries appear to be the most promising source of these compounds on the basis of serving size, according to the researcher. The compounds are found in both sweet and sour (tart) cherry varieties.

The potential benefits of cherries extend beyond diabetes. Previous studies by the researcher found that certain anthocyanins isolated from cherries have anti-inflammatory properties and may be useful in fighting arthritis. Nair’s colleagues have found that cherries also may help fight colon cancer.

But people with diabetes are encouraged to use caution when it comes to consuming maraschino cherries, the bright red candied version that adorns ice cream and cocktails, Nair points out. Many of the beneficial cherry pigments that were present in the fresh fruit have been removed during processing, replaced with food coloring, and extra sugar has been added.

The American Chemical Society is a nonprofit organization, chartered by the U.S. Congress, with a multidisciplinary membership of more than 159,000 chemists and chemical engineers. It publishes numerous scientific journals and databases, convenes major research conferences and provides educational, science policy and career programs in chemistry. Its main offices are in Washington, D.C., and Columbus, Ohio.

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Article adapted by MD Only Weblog from original press release.
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Contact: Michael Bernstein
American Chemical Society

Adding Vitamins C and E to diet improves effectiveness of insulin

Adding antioxidants to therapy improves drug’s ability to reduce blood sugar

Boosting insulin with vitamins C and E may improve the drug’s effectiveness for treating diabetes.

A UC Irvine College of Medicine study has found that the popular antioxidant supplements not only enhance insulin’s ability to reduce blood sugar, but also lower the risks of organ damage that can occur despite insulin treatments. The study appears in the January issue of Kidney International.

Dr. Nick Vaziri, professor of medicine, and his team found that untreated diabetes raised blood pressure and increased the production of damaging oxidizing agents called free radicals. The free radicals converted sugars and proteins into harmful chemicals, increasing the risks of tissue damage often seen in untreated diabetes.

Treating the rats with insulin alone improved high blood pressure somewhat and partially spared the sugars and proteins from the free radicals’ assault. But it also added a new problem, as the free radicals turned their attack on nitric oxide, a ubiquitous molecule that usually protects the body from free radicals. This new attack results in yet more toxic chemicals, with the potential to inflict damage to tissues.

Adding vitamins C and E to insulin, however, spared the sugars, proteins and nitric oxide from attack.

“Blood pressure was lowered to normal, and free radicals were not in sufficient numbers to degrade the sugars, proteins and nitric oxide,” Vaziri said. “We think this shows that a diet rich in antioxidants may help diabetics prevent the devastating cardiovascular, kidney, neurological and other damage that are common complications of diabetes.”

Diabetes affects nearly 17 million Americans. Insulin is the predominant treatment, but patients eventually develop complications, like various forms of heart disease and nerve, liver and kidney damage. Studies would still have to be tested in humans, but Vaziri believes that adding vitamins C and E to an insulin-dependent diabetic’s diet should help treat the disease and perhaps prevent future organ damage.

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Article adapted by MD Only Weblog from original press release.
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Contact: Andrew Porterfield
University of California – Irvine

Ginseng extract fights diabetes, lowers cholesterol and decreases weight

An extract from the ginseng berry shows real promise in treating diabetes and obesity, reports a research team from the University of Chicago’s Tang Center for Herbal Medicine Research. In the June issue of the journal Diabetes, they show that the extract completely normalized blood glucose levels, improved sensitivity to insulin, lowered cholesterol levels, and decreased weight by reducing appetite and increasing activity levels in mice bred to develop diabetes.For more than 2000 years, traditional Chinese medicine has used ginseng root to treat a variety of ailments. This study focused instead on substances found in the ginseng berry, which has very different concentrations of ginsenosides, the substances thought to be medically useful.

“Ginseng berry has a distinctive chemical profile and has not previously been used for therapy,” said Chun-Su Yuan, M.D., Ph.D., assistant professor of anesthesia and critical care at the University of Chicago and director of the study. “We were stunned by how different the berry is from the root and by how effective it is in correcting the multiple metabolic abnormalities associated with diabetes.”

Yuan’s team, which included researchers from the Tang Center, anesthesia, clinical pharmacology and medicine, studied the effects of the extract, made from the pulp of the berry. They also studied one particular substance known as ginsenoside Re, which is concentrated in ginseng berries but quite scarce in the root.

They tested the extract by injecting it once a day into mice with a gene defect that causes weight gain and type 2 diabetes. They found that —

• Daily injections of 150 mg/kg of the ginseng berry extract restored normal blood-sugar levels in diabetic mice. Blood-glusoce levels fell from 222 mg/dl (quite high for a mouse) to 137 mg/dl (normal) within 12 days. Treated mice also had better scores on a glucose tolerance test, which measures how quickly the mice could remove excess glucose from the blood.
• The extract caused diabetic mice, which were also obese, to lose more than 10 percent of their body weight in 12 days. Untreated mice gained five percent of their weight in 12 days. The treated mice ate 15 percent less and were 35 percent more active than untreated mice. Once the injections stopped, weight gain gradually resumed.
• The extract improved insulin secretion and insulin sensitivity, both of which were abnormal in mice with diabetes.
• Treated diabetic mice had 30 percent lower cholesterol levels than untreated diabetic mice (117mg/dl versus 169mg/dl).

The extract had no detectable effect on normal mice.

Tests using a ginsenoside Re alone found that it had all of the anti-diabetic but none of the obesity-fighting activities of the extract.

“This novel compound could serve as the basis for a whole new class of anti-diabetic medications,” said Yuan, who is also working to isolate other substances from the extract that contributed to the weight loss.

There is a pressing need for new and more effective drugs for both diabetes and obesity. Diabetes is the seventh leading killer in the U.S. Type 2 diabetes affects almost six percent of the U.S. population and 18.4 percent of those over 65. The cost of the disease is estimated at $105 billion each year.

The U.S. Surgeon General estimates that 61 percent of adults are overweight or obese. Obesity — wieghing more than 20 percent over your maximum recommended body weight — contributes to an estimated 300,000 deaths each year. The economic cost of obesity in the U.S. was about $117 billion in 2000. The rising rate of obesity also contributes to the growing prevalence of type 2 diabetes.

“Since this berry contains agents that are effective against both obesity and diabetes, the ginseng fruit has enormous promise as a source of new drugs,” said Yuan, who has worked with the University to apply for a patent on the development of ginsenoside Re as a diabetes medication.

“The next step is to isolate the other substances in the extract, find out whether they also effect glucose regulation or weight gain, learn how they work and determine the safe and effective dose.”

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Article adapted by MD Only Weblog from original press release.
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Contact: John Easton
University of Chicago Medical Center

Additional authors of the study were Anoja Attele, Yun-Ping Zhou, Jing-Tian Xie, Ji An Wu, Liu Zhang, Lucy Dey, William Pugh and Paul Rue of the University of Chicago and Kenneth Polonsky, now at Washington University in St. Louis. The research was funded by the Tang Family Foundation and the National Institutes of Health.