CLA Targets Diabetes

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Compound In Dairy Products Targets Diabetes

http://www.sciencedaily.com/releases/2006/08/060804083351.htm

Fatty acids commonly found in dairy products have successfully treated diabetes

in mice, according to a researcher at Penn State. The compounds, known as

conjugated linoleic acids (CLA), have also shown promising results in human

trials, signaling a new way of potentially treating the disease without

synthetic drugs.

" The compounds are predominantly found in dairy products such as milk, cheese

and meat, and are formed by bacteria in ruminants that take linoleic acids --

fatty acids from plants -- and convert them into conjugated linoleic acids, or

CLA, " says Jack Vanden Heuvel, professor of molecular toxicology in Penn State's

College of Agricultural Sciences and co-director of Penn State's Center of

Excellence in Nutrigenomics.

Researchers first became interested in CLA when it was shown to inhibit a

variety of cancers such as breast, skin and colon in mice, and further research

showed effects on circulating cholesterol and inflammation. These effects are

the same as the newest generation of synthetic drugs used to treat diabetes in

humans.

These synthetic drugs act by triggering a set of nuclear receptors called PPAR.

In addition to being targets for a variety of clinically effective drugs, PPARs

belong to a large family of proteins, and their biological purpose is to sense

fatty acids and fatty acid metabolites within the cell, says Vanden Heuvel.

When the synthetic drugs interact with these protein receptors, it turns the

receptor " on, " making it an active form of the protein, which then interacts

with DNA and regulates gene expression. This increases the enzymes that process

fatty acids and also increases the tissues' sensitivity to insulin.

" We wondered if CLA was using the same mechanism, in which case it could be used

as an anti-diabetes drug, " Vanden Heuvel says.

To test the idea, he used CLA on mice prone to adult onset (Type-2) diabetes.

Results indicated that the mice had an improvement in insulin action, and a

decrease in circulating glucose. Also, the mechanism was indeed similar to that

of the drugs.

" Anti-diabetes drugs act the same way. They mimic the natural activators of the

receptors by getting into the cell and interacting with the PPARs to regulate

glucose and fat metabolism, " says Vanden Heuvel.

Early human trials indicate that when administered for longer than 8 weeks, CLA

improves the body's misregulation of insulin and lowers the level of glucose in

the blood in patients with adult onset, or Type-2 diabetes, the most common form

of this disease.

However, Vanden Heuvel cautions that while having a diet that is high in dairy

and meat products, and thereby CLA, might have a health benefit, one must also

be aware of other lipids present in these products, such as trans fatty acids.

Instead, he suggests that in addition to a well-balanced diet, it is

advantageous to incorporate CLA as a dietary supplement, or to seek out new

products that enrich foods such as butter, margarine and ice cream with CLA.

" Adult-onset diabetes is fast becoming an epidemic and is largely associated

with poor diet and nutrition and other lifestyle issues, " Vanden Heuvel says.

The reason for the increase in diabetes may have to do with the ratio of

so-called " good " and " bad " fats, with the average American diet containing too

much of the " bad " fats. CLA, whose effect is very similar to fish oil, a source

of " good " fat, could prove beneficial against Type-2 diabetes.

" And compared to the synthetic drugs used to treated this disease, CLA does not

cause weight gain and may in fact decrease overall body fat, " says Vanden

Heuvel, who has been granted a patent on the new method of treating diabetes

with CLA.

Other researchers on the patent include Martha Belury, Ohio State University,

and Louise Peck, University of Washington, for the work initially conducted at

Purdue University.

The Penn State Center of Excellence in Nutrigenomics is at

http://nutrigenomics.psu.edu/.