Increase in the levels of insulin can raise the level of inflammatory makers that influence the Alzheimer’s’ Disease. The study is being published by Archives of Neurology.
Conditions of insulin resistance and hyper-insulinemia are associated with elevated levels //of inflammatory markers and increase the risk for Alzheimer disease (AD). Inflammation has been proposed as a key pathogenic factor for AD.
Researchers from the University of Washington, Seattle, raised blood insulin levels (while maintaining normal blood sugar levels) in 16 healthy older adults ranging in age from 55 to 81 years, and then measured the changes in levels of inflammatory markers, modulators, and beta-amyloid (a protein associated with AD) in plasma and cerebrospinal fluid.
Moderate peripheral hyperinsulinemia (increased levels of insulin) provoked striking increases in CNS (central nervous system) inflammatory markers, the authors reported. Their findings suggest that insulin-resistant conditions such as diabetes mellitus and hypertension may increase the risk for AD, in part through insulin-induced inflammation.
Although this model has obvious relevance for diabetes mellitus, hyperinsulinemia and insulin resistance are widespread conditions that affect many nondiabetic adults with obesity, impaired glucose tolerance, cardiovascular disease, and hypertension. The results provide a cautionary note for the current epidemic of such conditions, which, in the context of an aging population, may provoke a dramatic increase in the prevalence of AD. More encouragingly, greater understanding of insulin’s role in AD pathogenesis may lead to novel and more effective strategies for treating, delaying, or even preventing this challenging disease, the authors had concluded.
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