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Gene offers an athlete's heart without the exercise
Date:6/13/2013

Researchers at Case Western Reserve University have found that a single gene poses a double threat to disease: Not only does it inhibit the growth and spread of breast tumors, but it also makes hearts healthier.

In 2012, medical school researchers discovered the suppressive effects of the gene HEXIM1 on breast cancer in mouse models. Now they have demonstrated that it also enhances the number and density of blood vessels in the heart a sure sign of cardiac fitness.

Scientists re-expressed the HEXIM1 gene in the adult mouse heart and found that the hearts grew heavier and larger without exercise. In addition, the animals' resting heart rates decreased. The lowered heart rate indicates improved efficiency, and is supported by their finding that transgenic hearts are pumping more blood per beat. The team also discovered that untrained transgenic mice ran twice as long as those without any genetic modification.

"Our promising discovery reveals the potential for HEXIM1 to kill two birds with one stone potentially circumventing heart disease as well as cancer, the country's leading causes of death," said Monica Montano, PhD, associate professor of pharmacology, member of the Case Comprehensive Cancer Center, who created the mice for the heart and breast cancer research and one of the lead researchers.

Hypertension and subsequent heart failure are characterized by a mismatch between the heart muscles' need for oxygen and nutrients and blood vessels' inability to deliver either at the rate required. This deficit leads to an enlarged heart that, in turn, often ultimately weakens and stops. The researchers showed that increasing blood vessel growth through the artificial enhancement of HEXIM1 levels improved overall function HEXIM1 may be a possible therapeutic target for heart disease.

The study, published online in the peer-reviewed journal Cardiovascular Research, is the sixth from the team of Dr. Montano and Mi
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Contact: Jessica Studeny
jessica.studeny@case.edu
216-368-4692
Case Western Reserve University
Source:Eurekalert

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