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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2014-09-15T00:00:00-04:00" class="date-display-single">September 15, 2014</span></p><div class='syndicate'><h1>Molecule Protects Against Heart Failure in Mice</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
<ul class="spaced">
<li>Researchers identified a molecule that plays a role in heart failure in mice.</li>
<li>The findings may lead to a new therapeutic agent to treat this common condition.</li>
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<picture title="Heart cell images">
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</picture><span class="caption">Cells in stressed mouse hearts (right) become larger than those in unstressed hearts (left).</span><span class="credit">Image by the researchers, courtesy of Nature</span></div>
</div><p>Heart failure is a serious condition that affects more than 5 million people in the United States. It occurs when the heart cant pump enough blood to meet the bodys needs. In some cases, the heart cant fill with enough blood. In other cases, the heart doesnt have enough force to pump blood to the rest of the body. The heart may respond in several ways, including increasing the size of heart cells to create more muscle mass and enlarging the heart chambers to pump more strongly.</p>
<p>Heart failure stems from diseases that damage or overwork the heart muscle, such as high blood pressure, coronary artery disease, and diabetes. The condition can cause trouble breathing, fatigue, and fluid buildup that results in swelling and weight gain. Theres no cure for heart failure, but medicines and lifestyle changes can help people who have the condition live longer and more active lives.</p>
<p>A team led by Dr. Ching-Pin Chang of Indiana University set out to better understand the molecular pathways involved in heart failure. The work was funded in part by NIHs National Heart, Lung, and Blood Institute (NHLBI). Results appeared online on August 10, 2014, in <em>Nature</em>.</p>
<p>The researchers discovered a group of long non-coding RNAs specific to heart muscle. RNA is genetic material that typically functions as a template to make proteins. Some RNA, however, doesnt code for proteins, and instead plays other important roles in the body. These particular RNA pieces came from a genetic region that normally codes for myosin heavy chain proteins, which are abundant in heart tissue. Thus, the team named them <em>Myheart</em>.</p>
<p>When the hearts of mice were stressed to induce heart failure, they became abnormally large and fibrous, and didnt contract very well. Levels of <em>Myheart</em> decreased in these stressed hearts. The team used gene transfer technologies to restore levels of <em>Myheart</em> to normal in mice subjected to heart damage-inducing stress. The stressed hearts didnt become as enlarged in the mice producing <em>Myheart</em> and had improved function, indicating that <em>Myheart</em> had a protective effect against heart failure.</p>
<p>Previous work by the team found that a protein called Brg1 is activated in stressed hearts. The team showed that Brg1 bound to DNA to inhibit production of <em>Myheart</em>, leading to heart damage. When <em>Myheart</em> was restored, it bound to Brg1 and prevented it from recognizing its DNA targets, thus protecting the heart from enlargement and failure.</p>
<p>“I think of <em>Myheart</em> as a molecular crowbar that pries BRG1 off the genomic DNA and prevents it from manipulating genetic activity,” Chang says.</p>
<p><em>Myheart</em> is also repressed in stressed human hearts. While this study was done in mice, its findings could lead to new therapies for human disease. The team is now working to develop ways to chemically modify <em>Myheart</em> for potential delivery as a therapeutic drug.</p>
<p>—by Carol Torgan, Ph.D.</p>
</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="http://www.nih.gov/researchmatters/september2012/09242012junk.htm" target="_top">Finding Treasure in “Junk” DNA</a></li><li><a href="http://www.nih.gov/researchmatters/june2014/06092014proteome.htm" target="_top">Revealing The Human Proteome</a></li><li><a href="http://www.nih.gov/researchmatters/october2011/10242011genome.htm" target="_top">Genome Comparison Casts Light on Dark Areas of DNA</a></li><li><a href="http://www.nhlbi.nih.gov/health/health-topics/topics/hf/" target="_top">Heart Failure</a></li></ul><p class="footnote"><strong class="label-inline">References:&nbsp;</strong><a href="http://www.ncbi.nlm.nih.gov/pubmed/25119045">A long noncoding RNA protects the heart from pathological hypertrophy.</a> Han P, Li W, Lin CH, Yang J, Shang C, Nuernberg ST, Jin KK, Xu W, Lin CY, Lin CJ, Xiong Y, Chien HC, Zhou B, Ashley E, Bernstein D, Chen PS, Chen HS, Quertermous T, Chang CP. <em>Nature</em><em>.</em> 2014 Aug 10. doi: 10.1038/nature13596. [Epub ahead of print]. PMID: 25119045.</p><p class="footnote"><strong class="label-inline">Funding:&nbsp;</strong>NIHs National Heart, Lung, and Blood Institute (NHLBI), American Heart Association, March of Dimes Foundation, California Institute of Regenerative Medicine, Oak Foundation, Baxter Foundation, Stanford Heart Center Research Program, Indiana University (IU) School of Medicine—IU Health Strategic Research Initiative, and the IU Physician-Scientist Initiative, endowed by Lilly Endowment</p>
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