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3-way control of fetal heart-cell proliferation could help regenerate cardiac cells

Heart muscle cells do not normally replicate in adult tissue, but multiply with abandoned during development. This is why the loss of heart muscle after a heart attack is so dire—you can’t grow enough new heart muscle to make up for the loss.

A team of researchers at the University of Pennsylvania School of Medicine describe the interconnections between three-molecules that control fetal, heart-muscle-cell proliferation in a mouse model that will help cardiologists better understand the natural repair process after heart attacks and help scientists learn how to expand cardiac stem cells for regenerative therapies.

The research team, led by Jonathan Epstein, MD, chair of the Department of Cell and Developmental Biology, and Chinmay Trivedi, MD, PhD, an Instructor in the same department, report their findings in the cover article of the most recent issue of Developmental Cell.

The Penn team showed that an enzyme called Hdac2 directly modifies a protein called Gata4, and a third protein called Hopx, which appears to have adopted a new function. Hopx is a member of a family of ancient, evolutionally conserved proteins that normally bind DNA. In this case, however, rather than binding to DNA, it works to bring two other proteins, Hdac2 and Gata4, together. By performing this unexpected matchmaker function, Hopx helps to control the rate at which heart muscle cells divide.

“Although the degree to which hearts can repair themselves after injury is controversial, if there is a natural regeneration process, even if normally insufficient and modest, then approaches leveraging this insight this could be useful for boosting new growth so that it has a clinically significant effect,” says Epstein “We are eager to see if drugs like Hdac inhibitors will have this effect.”

The scientists found an unexpected function for Hdac2 as well. This enzyme normally acts as a switch that regulates how DNA is packaged inside the cell, and therefore how large groups of genes are turned on and off. Epstein said that his team was surprised discover that in the developing heart this packaging role was not the critical function.

“Rather, Hdac2 seems to be working directly on other proteins, and not on DNA structure, to control replication of heart muscle cells,” he says.

Hdac inhibitors are already in trials for cancer and one, valproic acid, has been used for decades to treat seizures. These inhibitors are a new class of agents that inhibit the proliferation of tumor cells in culture. Hdac inhibitors that are used to fight T cell lymphoma could possibly be used to enhance cardiac cell proliferation, say after a heart attack, when growing new heart muscle to replace damaged tissue would be is most needed.

“This could help to explain why Hdac inhibitors improve outcomes after heart attacks in animal models,” says Trivedi.

This research was funded by the National Heart, Lung and Blood Institute, the WW Smith Charitable Trust, and the American Heart Association.

Penn Medicine is one of the world’s leading academic medical centers, dedicated to the related missions of medical education, biomedical research, and excellence in patient care. Penn Medicine consists of the University of Pennsylvania School of Medicine (founded in 1765 as the nation's first medical school) and the University of Pennsylvania Health System, which together form a $3.6 billion enterprise.

Penn’s School of Medicine is currently ranked #2 in U.S. News & World Report’s survey of research-oriented medical schools, and is consistently among the nation’s top recipients of funding from the National Institutes of Health, with $367.2 million awarded in the 2008 fiscal year.

Penn Medicine’s patient care facilities include:

The Hospital of the University of Pennsylvania – the nation’s first teaching hospital, recognized as one of the nation’s top 10 hospitals by U.S. News & World Report.

Penn Presbyterian Medical Center – named one of the top 100 hospitals for cardiovascular care by Thomson Reuters for six years.

Pennsylvania Hospital – the nation’s first hospital, founded in 1751, nationally recognized for excellence in orthopaedics, obstetrics & gynecology, and psychiatry & behavioral health.

Additional patient care facilities and services include Penn Medicine at Rittenhouse, a Philadelphia campus offering inpatient rehabilitation and outpatient care in many specialties; as well as a primary care provider network; a faculty practice plan; home care and hospice services; and several multispecialty outpatient facilities across the Philadelphia region.

Penn Medicine is committed to improving lives and health through a variety of community-based programs and activities. In fiscal year 2009, Penn Medicine provided $733.5 million to benefit our community.

Karen Kreeger | EurekAlert!
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