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Diabetes 2 trigger may lie in our bones: Blood sugar regulation is driven by bone cell replacement cycle

  [ 14 votes ]   [ Discuss This Article ] • July 22, 2010

Since most drugs to treat osteoporosis work by inhibiting bone resorption/activation of osteocalcin, might they be a cause of glucose intolerance in some patients?

A research collaborative has discovered that the skeleton plays an important role in regulating blood sugar, and has further illuminated how bone controls this process. Led by Gerard Karsenty, MD, PhD, chair of Genetics & Development at Columbia University Medical Center, the researchers found that the destruction of old bone during normal skeletal regrowth - a process known as resorption - is necessary to maintain a healthy level of glucose in the blood.

While resorption is a process that occurs throughout life to make way for new bone, the team discovered that it also acts to stimulate the release of insulin into the bloodstream and improve the uptake of glucose by cells in the entire body.

The findings, published July 22 in the journal Cell and offered online at no charge, suggest that:

• For some people, diabetes may develop from changes in the skeleton, and that

• Drugs designed to stimulate the bone-insulin pathway may lead to better drugs for type 2 diabetes.

The First Clue

The first clue that the skeleton may have an important role in regulating blood glucose came in 2007 when Dr. Karsenty discovered that a hormone released by bone - known as osteocalcin - can regulate glucose levels.

• Osteocalcin turns on the production of insulin in the pancreas and improves the ability of other cells to take in glucose.

• Both of these processes are impaired in type 2 diabetes.

The new paper reveals that osteocalcin cannot work until cells that degrade bone start working and begin the resorption process. As the cells degrade bone, inactive osteocalcin is converted to its active form by the increase in acidity around the bone.

“Remarkably, insulin was discovered to favor bone resorption. Hence, in a feed-forward loop it favors the activation of osteocalcin, which in turn favors insulin synthesis and secretion,” said Dr. Karsenty.

“Insulin is a street-smart molecule that takes advantage of the functional interplay between bone resorption and osteocalcin, to turn on the secretion and synthesis of more insulin.”

By identifying the tight connection existing between energy metabolism and skeleton physiology – in this case between insulin and osteocalcin – this new study further underscores the wealth of physiological function exerted by the skeleton.

The finding further strengthens the idea that diabetes could be treated by increasing the level of osteocalcin in the body. In addition, the researchers suggested that since most drugs to treat another condition – osteoporosis – work by inhibiting bone resorption, the drugs may decrease the activation of osteocalcin and cause glucose intolerance in some patients.

“This research has important implications for both diabetes and osteoporosis patients,” said Dr. Karsenty.

• “First, this research shows that osteocalcin is involved in diabetes onset;

• “Secondly, bone may become a new target in the treatment of type 2 diabetes, the most frequent form of diabetes, as it appears to contribute strongly to glucose intolerance;

• “And, finally, osteocalcin could become a treatment for type 2 diabetes.”

“And for people with osteoporosis, the concern is that a common treatment, bisphosphonates – which work by inhibiting bone resorption and therefore may increase glucose intolerance, could push someone with borderline glucose intolerance into full-fledged disease onset. Although more research is needed to study this further,” said Dr. Karsenty.

This work was supported by a fellowship from the Fond de la recherche en santé du Québec, grants from the National Institutes of Health, and the Juvenile Diabetes Research Foundation.

Source: Columbia University Medical Center news release, Jul

Ed Note: For further insight into factors that support bone health & healthy bone turnover, and the role it may play in diabetes, see for example:

1. Results of a study that followed more than 38,000 people in the Netherlands for 10 years, and found that higher dietary intake of bone supporting vitamin K was associated with a lower risk of developing type 2 diabetes. For each 10 micrograms of vitamin K regularly consumed, diabetes risk was reduced 7%. (Beulens JWJ, et al. “Dietary phylloquinone [K-1] and menaquinones [K-2] intake and risk of type 2 diabetes,” Diabetes Care, April 27, 2010.)

2. An evaluation of patients in a diabetes clinic which found low levels of bone-building vitamin D in 91%. (“Low Vitamin D seems to play “active role” in Diabetes 2 development, Johns Hopkins reports,”) June 2010 Endocrine Society Meeting, San Diego.

3. A review of research demonstrating the positive role of strontium in supporting healthy bone metabolism and density. “Strontium – The missing mineral for strong bones,” by Dr. Dana Myatt, NMD

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