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Washington: Researchers who examined the link between metabolic syndrome and cognitive disorders has stressed the need for new lines of research to identify effective therapeutic targets.
No effective treatments are currently available for the prevention or cure of Alzheimer’s disease (AD), the most frequent form of dementia in the elderly.
The most recognized risk factors, advancing age and having the apolipoprotein E 4 gene, cannot be modified or treated. Increasingly, scientists are looking toward other risk factors to identify preventive and therapeutic strategies. Much attention recently has focused on the metabolic syndrome (MetS), with a strong and growing body of research suggesting that metabolic disorders and obesity may play a role in the development of dementia.
Now, a new supplement to the Journal of Alzheimer’s Disease has provided a state-of-the-art assessment of research into the link between metabolic syndrome and cognitive disorders.
The supplement is guest edited by Vincenza Frisardi, of the Department of Neurological and Psychiatric Sciences, University of Bari, and the Geriatric Unit and Gerontology-Geriatrics Research Laboratory, IRCCS, Foggia, Italy, and Bruno P. Imbimbo, Research and Development Department, Chiesi Farmaceutici, Parma, Italy.
The prevalence of MetS and obesity has increased over the past several decades. MetS is a cluster of vascular and metabolic risk factors including obesity, hypertension, an abnormal cholesterol profile, and impaired blood glucose regulation.
“Although molecular mechanisms underlying the relationship between MetS and neurological disorders are not fully understood, it is becoming increasingly clear that cellular and biochemical alterations observed in MetS may represent a pathological bridge between MetS and various neurological disorders,” explained Dr. Frisardi.
Type 2 diabetes (T2D) has been linked with cognitive impairment in a number of studies. The risk for developing both T2D and AD increases proportionately with age, and evidence shows that individuals with T2D have a nearly twofold higher risk of AD than nondiabetic individuals.
Paula I. Moreira, Faculty of Medicine and Center for Neuroscience and Cell Biology, University of Coimbra, Portugal, outline some of the likely mechanisms.
Both AD and T2D present similar abnormalities in the mitochondria, which play a pivotal role in cellular processes that impair their ability to regulate oxidation in the cell. Human amylin, a peptide that forms deposits in the pancreatic cells of T2D patients, shares several properties with amyloid-beta plaques in the Alzheimer’s brain.
Insulin resistance is another feature shared by both disorders. Impairment of insulin signalling is directly involved in the development of tau tangles and amyloid beta plaques.
“Understanding the key mechanisms underlying this deleterious interaction may provide opportunities for the design of effective therapeutic strategies,” Dr. Moreira noted.