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Article type: Review Article
Authors: Tan, Zaldy S.a; * | Vasan, Ramachandran S.b
Affiliations: [a] Division of Aging, Brigham and Women's Hospital; GRECC, VA Boston Healthcare System; Harvard Medical School (ZST), Boston, MA, USA | [b] Department of Medicine (RSV), Boston University School of Medicine, Boston, MA, USA
Correspondence: [*] Corresponding author: Zaldy S. Tan, M.D. Division of Aging, Brigham and Women's Hospital, 1620 Tremont Street, 3rd Flr, Boston, MA 02160, USA. Tel.: +1 617 525 7631; Fax: +1 617 525 7739; E-mail: [email protected].
Note: [] Communicated by Sudha Seshadri
Abstract: Thyroid dysfunction has been implicated as a cause of reversible cognitive impairment and as such, the thyroid stimulating hormone has long been part of the screening laboratory test for dementia. Recently, several population-based studies demonstrated an association between hypo- or hyperthyroidism and Alzheimer's disease. This review discusses the role of thyroid hormone in the normal development and regulation of central nervous system functions and summarizes the studies that have linked thyroid function and dementia risk. Finally, it explores possible biological mechanisms to explain this association, including the direct effects of thyroid hormone on cerebral amyloid processing, neurodegeneration and thyrotropin-mediated mechanisms and vascular mediated enhancement of Alzheimer's disease risk.
Keywords: Alzheimer's disease, dementia, hyperthyroidism, hypothyroidism, thyroid
DOI: 10.3233/JAD-2009-0991
Journal: Journal of Alzheimer's Disease, vol. 16, no. 3, pp. 503-507, 2009
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