Dolphins May Hold The Key To Treating Diabetes

Dolphins May Hold The Key To Treating Diabetes

Postby Sionnach Glic » Sun Feb 21, 2010 10:00 am

A study in dolphins has revealed genetic clues that could help medical researchers to treat type 2 diabetes.

Scientists from the US National Marine Mammal Foundation said that bottlenose dolphins are resistant to insulin - just like people with diabetes.

But in dolphins, they say, this resistance is switched on and off.

The researchers presented the findings at the annual meeting of the American Association for the Advancement of Science (AAAS) in San Diego.

They hope to collaborate with diabetes researchers to see if they can find and possibly even control an equivalent human "off switch".

The team, based in San Diego, took blood samples from trained dolphins that "snack" continuously during the day and fast overnight.

"The overnight changes in their blood chemistry match the changes in diabetic humans," explained Stephanie Venn-Watson, director of veterinary medicine at the foundation.

This means that insulin - the hormone that reduces the level of glucose in the blood - has no effect on the dolphins when they fast.

Big brains

In the morning, when they have their breakfast, they simply switch back into a non-fasting state, said Dr Venn-Watson. In diabetic people, chronic insulin resistance means having to carefully control blood glucose, usually with a diet low in sugar, to avoid a variety of medical complications.

But in dolphins, the resistance appears to be advantageous. Dr Venn-Watson explained that the mammals may have evolved this fasting-feeding switch to cope with a high-protein, low-carbohydrate diet of fish.

"Bottlenose dolphins have large brains that need sugar," Dr Venn-Watson explained. Since their diet is very low in sugar, "it works to their advantage to have a condition that keeps blood sugar in the body to keep the brain well fed".

But other marine mammals, such as seals, do not have this switch, and Dr Venn-Watson thinks that the "big brain factor" could be what connects human and dolphin blood chemistry.

There are several interesting diseases that you only see in humans and dolphins
Lori Schwacke
NOAA

"We're really looking at two species that have big brains with high demands for blood glucose," she said.

"And we have found changes in dolphins that suggest that [this insulin resistance] could get pushed into a disease state. "If we started feeding dolphins Twinkies, they would have diabetes."

Genetic link

Since both the human genome and the dolphin genome have been sequenced, Dr Venn-Watson hopes to work with medical researchers to turn the discovery in dolphins into an eventual treatment for humans.

"There is no desire to make a dolphin a lab animal," she said. "But the genome has been mapped - so we can compare those genes with human genes."

Scientists at the Salk Institute in San Diego have already discovered a "fasting gene" that is abnormally turned on in people with diabetes, "so maybe this is a smoking gun for a key point to control human diabetes", Dr Venn-Watson said.

If scientists can find out what switches the fasting gene on and off in dolphins, they may be able to do the same thing in people.

Lori Schwacke, a scientist from the National Oceanic and Atmospheric Administration (NOAA) in Charleston, South Carolina, said that the work demonstrated that there are interesting similarities between dolphins and humans.

Dr Schwacke, who is studying the effect of pollution on dolphins along the coast of the US state of Georgia, is also interested in the links between dolphin and human health.

"There are several interesting diseases that you only see in humans and dolphins," she told BBC News. In this case, Dr Venn-Watson said, "the fundamental difference is that dolphins can switch it off and humans can't".


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Re: Dolphins May Hold The Key To Treating Diabetes

Postby Captain Seafort » Sun Feb 21, 2010 10:52 am

Interesting article. Doesn't look like there's anything that can be directly developed into a treatment yet, but there's certainly some potential for more digging.
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Re: Dolphins May Hold The Key To Treating Diabetes

Postby colmquinn » Sun Feb 21, 2010 11:57 am

So basically we have an excuse to pulp dolphins now eh, excellent (in a mr burns style)
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Re: Dolphins May Hold The Key To Treating Diabetes

Postby Mikey » Wed Mar 03, 2010 1:55 pm

I just don't see much benefit to this, other than the "hey, that's interesting" view. A normal, innate condition in one animal doesn't necessarily correlate to a syndrome - even one with similar results - in another animal. What we're looking at hear is an attempt to overcome insulin resistance in humans... which we already have. Glucophage and its analogs/descendants are the most commonly prescribed drugs for type-2 (insulin-resistant) diabetes - while they are far from perfect, they do one thing pretty well: overcome insulin resistance.

Except in minority cases in which type-2 diabetes is brought on by potent psychoactive medications, humans also generally have an "on" switch for insulin resistance. Flipping it usually involves obesity, diets high in monosaccharides, and an overly sedentary lifestyle.

I'd be more interested in research on pancreatic repair. Obviously, it would treat type-1 diabetes; and as current thinking has led to an increasing amount of insulin therapy for type-2 diabetes, it would help there as well.
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