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Researchers at the University of Virginia School of Medicine have identified a critical cause of chronic inflammation that accelerates ageing. This discovery could allow us to turn back the clock and live longer, healthier lives, as well as prevent age-related illnesses like lethal heart disease and catastrophic mental problems that strip us of our faculties.
So what drives this harmful inflammation? The answer is improper calcium signaling in the mitochondria of certain immune cells. Mitochondria are the power generators in all cells, and they rely heavily on calcium signaling. The UVA Health researchers, led by Bimal N. Desai, PhD, found that mitochondria in immune cells called macrophages lose their ability to take up and use calcium with age. This, the researchers show, leads to chronic inflammation responsible for many of the ailments that afflict our later years. The researchers believe that increasing calcium uptake by the mitochondrial macrophages could prevent the harmful inflammation and its terrible effects. Because macrophages reside in all organs of our bodies, including the brain, targeting such tissue-resident macrophages with appropriate drugs may allow us to slow age-associated neurodegenerative diseases. I think we have made a key conceptual breakthrough in understanding the molecular underpinnings of age-associated inflammation, said Desai, of UVAsDepartment of Pharmacologyand UVAs Carter Immunology Center. This discovery illuminates new therapeutic strategies to interdict the inflammatory cascades that lie at the heart of many cardiometabolic and neurodegenerative diseases. The Inflammation of Aging Inflammaging Macrophages are white blood cells that play critical roles in our immune systems and, in turn, our good health. They swallow up dead or dying cells, allowing our bodies to remove cellular debris, and patrol for pathogens and other foreign invaders. In this latter role, they act as important sentries for our immune systems, calling for help from other immune cells as needed. Scientists have known that macrophages become less effective with age, but it has been unclear why. Desais new discovery suggests answers. Desai and his team say their research has identified a keystone mechanism responsible for age-related changes in the macrophages. These changes, the scientists believe, make the macrophages prone to chronic, low-grade inflammation at the best of times. And when the immune cells are confronted by an invader or tissue damage, they can become hyperactive. This drives what is known as inflammaging chronic inflammation that drives aging. Further, the UVA Health scientists suspect that the mechanism they have discovered will hold true not just for macrophages but for many other related immune cells generated in the bone marrow. That means we may be able to stimulate the proper functioning of those cells as well, potentially giving our immune systems a big boost in old age, when we become more susceptible to disease. Next Steps Fixing inflammaging wont be as simple as taking a calcium supplement. The problem isnt a shortage of calcium so much as the macrophages inability to use it properly. But Desais new discovery has pinpointed the precise molecular machinery involved in this process, so we should be able to discover ways to stimulate this machinery in aging cells. This highly interdisciplinary research effort, at the interface of computational biology, immunology, cell biology and biophysics, wouldnt have been possible without the determination of Phil Seegren, the graduate student who spearheaded this ambitious project, Desai said. Now, moving forward, we need an equally ambitious effort to figure out the wiring that controls this mitochondrial process in different types of macrophages and then manipulate that wiring in creative ways for biomedical impact. (ANI)
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