489 lines
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<p class="publishdate"><span class="tag-term">News Release</span></p><p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2024-12-11T16:30:00-05:00" class="date-display-single">Wednesday, December 11, 2024</span></p><h1>NIH research reveals new insights about how 'bad' cholesterol works in the body</h1><p class="subtitle">
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Findings could pave the way for more personalized treatments for cardiovascular disease.</p><p>National Institute of Health (NIH) scientists have made a significant breakthrough in understanding how "bad" cholesterol, known as low-density lipoprotein-cholesterol or LDL-C, builds up in the body. The researchers were able to show for the first time how the main structural protein of LDL binds to its receptor – a process that starts the clearing of LDL from the blood – and what happens when that process gets impaired.</p>
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<p>The <a href="https://www.nature.com/articles/s41586-024-08223-0">findings</a>, published in <em>Nature, </em>further the understanding of how LDL contributes to heart disease, the world’s leading cause of death, and could open the door to personalizing LDL-lowering treatments like statins to make them even more effective.</p>
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<p>“LDL is one of the main drivers of cardiovascular disease which kills one person every 33 seconds, so if you want to understand your enemy, you want to know what it looks like,” said Alan Remaley, M.D., Ph.D., co-senior author on the study who runs the Lipoprotein Metabolism Laboratory at NIH’s National Heart, Lung, and Blood Institute.</p>
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<p>Until now scientists have been unable to visualize the structure of LDL, specifically what happens when it links up with its receptor, a protein known as LDLR. Typically, when LDL binds to LDLR, the process of clearing LDL from the blood begins. But genetic mutations can prevent that work, causing LDL to build up in the blood and get deposited into the arteries as plaque, which can lead to atherosclerosis, a precursor for heart disease.</p>
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<p>In the new study, the researchers were able to use high-end technology to get a view of what’s happening at a critical stage of that process and see LDL in a new light.</p>
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<p>“LDL is enormous and varies in size, making it very complex,” explained Joseph Marcotrigiano, Ph.D., chief of the Structural Virology Section in the Laboratory of Infectious Diseases at NIH’s National Institute of Allergy and Infectious Diseases and co-senior author on the study. “No one's ever gotten to the resolution we have. We could see so much detail and start to tease apart how it works in the body.”</p>
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<p>Using advanced imaging technique called cryo-electron microscopy, the researchers were able to see the entirety of the structural protein of LDL when it bound to LDLR. Then, with artificial intelligence-driven protein prediction software, they were able to model the structure and locate the known genetic mutations that result in increased LDL. The developers of the software, who were not involved in the study, were recently awarded the 2024 Nobel Prize in Chemistry.</p>
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<p>The researchers found that many of the mutations that mapped to the location where LDL and LDLR connected, were associated with an inherited condition called familial hypercholesterolemia (FH). FH is marked by defects in how the body uptakes LDL into its cells, and people with it have extremely high levels of LDL and can have heart attacks at a very young age. They found that FH-associated variants tended to cluster in particular regions on LDL.</p>
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<p>The study findings could open new avenues to develop targeted therapies aimed at correcting these kinds of dysfunctional interactions caused by mutations. But, as importantly, the researchers said, they could also help people who do not have genetic mutations, but who have high cholesterol and are on statins, which lower LDL by increasing LDLR in cells. By knowing precisely where and how LDLR binds to LDL, the researchers say they may now be able to target those connection points to design new drugs for lowering LDL from the blood. </p>
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<p>Funding: This work was supported by the Intramural Research Programs of the National Heart, Lung, and Blood Institute, National Institute of Allergy and Infectious Diseases, National Cancer Institute, and the High-Value Datasets program from the NIH Office of Data Science Strategy.</p>
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<p><strong><em>About the National Heart, Lung, and Blood Institute (NHLBI):</em></strong><em> NHLBI is the global leader in conducting and supporting research in heart, lung, and blood diseases and sleep disorders that advances scientific knowledge, improves public health, and saves lives. For more information, visit </em><a href="https://www.nhlbi.nih.gov/"><em>www.nhlbi.nih.gov</em></a><em>.</em></p><p><strong>About the National Institutes of Health (NIH):</strong>
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NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit <a href="/">www.nih.gov</a>.</p>
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<h3>Study</h3><p>Reimund M, Dearborn AD, Graziano G, et al. Structure of Apolipoprotein B100 bound to low-density lipoprotein receptor. Nature. 2024. DOI: <a href="https://www.nature.com/articles/s41586-024-08223-0">10.1038/s41586-024-08223-0</a></p>
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