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Friday, July 23, 2010

New Drug Sans Risk of Heart Attack and Fracture Risk

Posted by Prahallad Panda on 6:57 AM Comments

Scientists are working to develop newer drugs which will not have the side effects of rosiglitazone and pioglitazone i.e. risk of fracture and heart attack.

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Study raises hope for safer diabetes drugs

CHICAGO (Reuters) - A new understanding of the link between diabetes and obesity may help drug companies design safer versions of treatments like GlaxoSmithKline's Avandia, U.S. researchers said on Wednesday.

"Our findings strongly suggest that good and bad effects of these drugs can be separated by designing second-generation drugs that focus on the newly uncovered mechanism," Bruce Spiegelman of Dana-Farber Cancer Institute in Boston, who worked on the study in the journal Nature, said in a statement.

The drugs act on a protein called PPAR-gamma, found mostly in fat cells, that regulates genes involved in the body's response to insulin.

Scientists had believed the drugs work by stimulating PPAR-gamma, causing it to increase the activity of some genes and dampen others. The Dana-Farber researchers and a team from The Scripps Research Institute in California now think the drugs work in a different way.

In studies in obese mice, they found obesity activates a molecular switch called cdk5, which causes a chemical change in PPAR-gamma, triggering resistance to insulin and increasing blood sugar levels.

They did studies in cells and a test tube and found that drugs like Avandia and Actos block changes in cdk5 in addition to stimulating PPAR-gamma.

Both drugs increase the risk of fractures and heart failure, and several reports have linked Avandia with an increased risk of heart attacks and strokes.

He thinks drug companies might be able to design more selective diabetes drugs that treat insulin resistance without stimulating PPAR-gamma, which Spiegelman thinks is responsible for the side effects seen in Actos and Avandia.


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