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	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

To the Editor: Normal male aging is associated with declines in serum levels of the sex steroid hormone testosterone, which contributes to a range of disorders including osteoporosis and sarcopenia.¹ Unknown is how this relationship applies to age-related disorders in the brain, an androgen-responsive tissue. We hypothesize that testosterone levels in the brain are depleted as a normal consequence of male aging and that low brain levels of testosterone increase the risk of developing Alzheimer disease (AD). Recent data suggest a correspondence between reduced serum levels of testosterone and the clinical diagnosis of AD.^2-3 However, it is unclear whether testosterone depletion contributes to or results from the disease process. To investigate this issue, testosterone and estradiol levels were analyzed in postmortem brain tissue of elderly men and compared with their neuropathological diagnoses.

Methods

Brain tissue from men who had provided informed consent was collected at autopsy by repositories associated with Alzheimer's . . . [Full Text of this Article]

Emily R. Rosario, MS
Neuroscience Graduate Program

Lilly Chang, MD; Frank Z. Stanczyk, PhD
Department of Obstetrics and Gynecology
Keck School of Medicine

Christian J. Pike, PhD
cjpike@usc.edu
Andrus Gerontology Center
University of Southern California
Los Angeles

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