'Bad' Cholesterol, Rare Alzheimer's May Be Linked
https://wb.md/2KaIRSZ WEDNESDAY, May 29, 2019 (HealthDay News) -- Here's another reason to keep your cholesterol under control: New research suggests that LDL, or "bad," cholesterol may play a role in the development of early-onset Alzheimer's. A rare form of the disease that occurs before the age of 65, early-onset Alzheimer's has previously been linked to a gene mutation involved in how the body processes fats and cholesterol. But that mutation only accounts for a small percentage of cases, the scientists noted. Their new research suggests that "LDL cholesterol levels [also] play a causal role in the pathogenesis of Alzheimer's disease," said lead researcher Dr. Thomas Wingo. He's an assistant professor of neurology at Emory University School of Medicine in Atlanta. "The big question is whether there is a causal link between cholesterol levels in the blood and Alzheimer's disease risk," Wingo said. "The existing data is murky on this point. Our current work is focused on testing whether there is a causal link." Most early-onset Alzheimer's disease is not explained by known gene mutations, Wingo added. The APOE genetic mutation, called APOE E4, raises levels of LDL cholesterol. High levels of this type of cholesterol can clog arteries, increasing the risk for heart attack and stroke. Other gene mutations associated with early-onset Alzheimer's are called APP, PSEN1 and PSEN2. But all of these genetic variants are only linked to about 10% of all cases of early-onset Alzheimer's. That leaves 90% of all early-onset Alzheimer's unexplained, Wingo said. For the study, he and his colleagues sequenced specific areas of the genes of more than 2,100 people. Of these, more than 650 suffered from early-onset Alzheimer's. In addition, more than 260 participants had their cholesterol levels checked. The researchers found that the APOE E4 mutation accounted for about 10% of early-onset Alzheimer's, which is the same as seen in late-onset Alzheimer's. They also looked for APP, PSEN1, and PSEN2 mutations, and found that about 3% of early-onset Alzheimer's patients had at least one of these variants. Wingo's team also found that participants with high LDL cholesterol levels were at a greater risk for early-onset Alzheimer's, compared with those with lower LDL levels. Health via WebMD Health https://www.webmd.com/ May 29, 2019 at 12:16PM
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