Researcher looks at role of TIMP3 protein linked with aortic aneurysms in the abdomen

Published on December 21, 2012 at 5:44 AM · No Comments

A researcher with the Faculty of Medicine & Dentistry and the Mazankowski Alberta Heart Institute is looking closely at a molecule linked to aortic aneurysms in the abdomen, and her findings could lead to a treatment to reduce swelling of the aortic artery, which would be a life-saving treatment.

Zamaneh Kassiri, a professor in the Department of Physiology, and Ratnadeep Basu, a PhD trainee in Kassiri's lab, have been looking at the role of a protein called TIMP3 in the vessels. Their most recent findings, published in The Journal of Biological Chemistry, shows that animal models that lacked TIMP3 developed abdominal aneurysms. TIMP3 inhibits a family of proteins that normally chew up the structural proteins in the aortic wall and this role of TIMP3 has turned out to be critical in preventing swelling of the aortic aneurysm.

"This means if we can find a way to boost TIMP3 in the area, aneurysms could be avoided," said Kassiri.

The researchers dug even further in the lab, looking at another molecule called MMP2, which is well known as a contributor to heart and vascular disease. In models that lacked TIMP3, their level of MMP2 was quite high. The thought was that if the researchers lower the level of MMP2, the swollen aorta would be rescued.

However, that wasn't the case.

"The swelling became even larger," said Kassiri. "It is one of the bad guys, so everyone thought it was contributing to the disease, but likely is not, at least in this setting. MMP2 knockouts [lab models stripped of MMP2] alone didn't develop aneurysm; it's a combination of TIMP3 and MMP2 deficiency that made it worse."

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