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Home / Health News / Calcium isn’t enough for resisting fractures!

Calcium isn’t enough for resisting fractures!

If you thought popping calcium pills could prevent osteoporosis, you might not be entirely right. New research by a researcher of Indian-origin shows that a lesser-known protein called osteocalcin mig

By: Admin   | | Published: December 13, 2012 9:22 am
Tags: Bone health  Calcium  Osteocalcin  Vitamin K  
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If you thought popping calcium pills could prevent osteoporosis, you might not be entirely right. New research by a researcher of Indian-origin shows that a lesser-known protein called osteocalcin might play a very important role for bone health. And what’s interesting is that Vitamin K found in green leafy vegetables like spinach is known to boost its levels in the body.  Also Read - Rheumatoid arthritis can be debilitating: Say goodbye to joint pain with curcumin in your diet

A new study from engineering researchers at Rensselaer Polytechnic Institute shows, for the first time, how the little-understood protein osteocalcin plays a significant role in the strength of our bones. The findings could lead to new strategies and therapeutics for fighting osteoporosis and lowering the risk of bone fracture. Also Read - New form of a drug may help treat osteoporosis, calcium-related disorders



Funded by the U.S. National Institutes of Health, the study details how fractures in healthy bones begin with the creation of incredibly tiny holes, each measuring only about 500 atoms in diameter, within the bone’s mineral structure. In the case of a slip, trip, or fall, the force of the impact on a bone physically deforms a pair of joined proteins, osteopontin and osteocalcin, and results in the formation of nanoscale holes. These holes, called dilatational bands, function as a natural defense mechanism, and help to prevent further damage to the surrounding bone. However, if the force of the impact is too great—or if the bone is lacking osteopontin, osteocalcin, or both—the bone will crack and fracture. Also Read - Osteoporosis Diet: 5 vital nutrients you need for strong bones

The multi-university study, led by Deepak Vashishth, head of the Department of Biomedical Engineering at Rensselaer, is the first to give evidence of fracture at the level of bone’s nanostructure. Partnering with Rensselaer on the study were Villanova University, the Hospital for Special Surgery in New York, and Yale University.

“This study is important because it implicates, for the first time, the role of osteocalcin in giving bone the ability to resist fracture,” Vashishth said. “Since osteocalcin is always the point of fracture, we believe that strengthening it could lead to a strengthening of the overall bone.”

Long known but little understood, the protein osteocalin has been produced by and present in animal bones since before the dawn of humanity. Recently, abnormalities in ostoecalcin production have been associated with type 2 diabetes as well as problems in reproductive health. Vashishth’s new study, however, is the first to explain the structural and mechanical importance of osteocalcin in bone.

Now that osteocalcin is known to participate in bone fracture, new strategies for strengthening the bond between osteocalin and osteopontin can be investigated, Vashishth said. Augmenting the body’s natural supply of osteocalcin, for example, could be one possible strategy for treating osteoporosis and other conditions leading to increased fracture risk, he said. Osteocalin must be in its carboxylated form to get absorbed into bone, and the protein is carboxylated by vitamin K. Vashishth said future studies could investigate the relation between vitamin K intake, osteocalcin, and bone strength.

“Currently, all of the advice for treating osteoporosis is related to calcium. We believe there’s more to the story than just calcium, and the results of this new study raise an important question about vitamin K. Leafy green vegetables are the best source of vitamin K—wouldn’t it be great if eating spinach and broccoli was not only healthy, but also good for your bones? We plan to investigate this link in future,” Vashisth said.

Results of the new study, titled “Dilatational band formation in bone,” were recently published online by Proceedings of the National Academy of Sciences, and will appear in an upcoming print edition of the journal. The study may be viewed online at: http://www.pnas.org/content/early/2012/10/31/1201513109.full.pdf

At Rensselaer, this research was conducted in the laboratories of the Center for Biotechnology and Interdisciplinary Studies.

Along with Vashisth, co-authors of the paper are Rensselaer BME graduate students Atharva Poundarik and, Tamim Diab, BME post-doctoral fellows Grazyna Sroga, and Ani Ural (currently a faculty member at Villanova University), Adele Boskey of the Musculoskeletal Integrity Program at the Hospital for Special Surgery in New York, and Caren Gundberg of the Department of Orthopedics and Rehabilitation at Yale University.

From Press release at Rennselaer Polytechnic Institute.

Published : December 13, 2012 9:22 am
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