Thyroid Hormone Levels in the Prefrontal Cortex of Post-Mortem Brains of Alzheimers Disease Patients

Author(s): Jennifer Duncan Davis, Anna Podolanczuk, John E. Donahue, Edward Stopa, James V. Hennessey, Lu-Guong Luo, Yow-Pin Lim, Robert A. Stern

Journal Name: Current Aging Science

Volume 1 , Issue 3 , 2008

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Converging evidence suggests a possible link between thyroid state and Alzheimers disease (AD), including a higher probability of dementia in individuals with higher TSH levels and a two-fold risk of AD in patients with hypothyroidism. Thyroid hormones modulate factors associated with AD, including amyloid precursor protein expression in the brain, suggesting a possible role for thyroid hormone in AD pathology. The present study is the first to directly evaluate brain thyroid hormone levels in AD. Triiodothyronine (T ) and thyroxine (T ) levels were measured with radioimmunoassay (RIA) in post-mortem samples of prefrontal cortex of patients with pathologically confirmed AD, including Braak stage I-II (n=8), Braak stage V-VI (n=8), and controls without any primary neurological disease (n=8). T levels did not differ between groups. T levels were significantly lower in Braak stage V-VI brains relative to controls, but there was no statistically significant difference between T levels in Braak stage I-II versus controls. Results suggest that the conversion of T to T may be affected in advanced AD, perhaps due to alterations in deiodinase activity. Reduced conversion of T to T3 in AD may be associated with both AD pathology and the clinical presentation of dementia.

Keywords: Thyroid hormones, thyroxine, Alzheimer's disease, dementia

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Article Details

Year: 2008
Page: [175 - 181]
Pages: 7
DOI: 10.2174/1874609810801030175
Price: $65

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