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SHBG Gene Promoter Polymorphisms in Men Are Associated with Serum Sex Hormone-Binding Globulin, Androgen and Androgen Metabolite Levels, and Hip Bone Mineral Density

Center for Bone Research at the Sahlgrenska Academy (A.L.E., M.L., D.M., L.V., C.S., N.A., S.H.W., C.O.), Departments of Internal Medicine and Geriatrics, Göteborg University, SE-413 45 Göteborg, Sweden; Department of Obstetrics and Gynaecology (G.L.H.), University of British Columbia and Child and Family Research Institute, Vancouver, Canada V5Z 4H4; Department of Laboratory Medicine (J.J., A.R.), Division of Clinical Pharmacology, Karolinska Institutet at Karolinska University Hospital, SE-141 86 Stockholm, Sweden; Bone and Mineral Research Unit (E.S.O.), Oregon Health and Sciences University and Portland Veterans Affairs Medical Center, Portland, Oregon 97207; Department of Medical Sciences (Ö.L.), University of Uppsala, SE-751 85 Uppsala, Sweden; Department of Orthopaedics (O.J.), Malmö General Hospital, SE-20502 Malmö, Sweden; and Laboratory of Molecular Endocrinology and Oncology (F.L.), Laval University Hospital Research Center (CRCHUL) and Laval University, Quebec, Canada G1V 4G2

Address all correspondence and requests for reprints to: Claes Ohlsson, Department of Internal Medicine, Division of Endocrinology, Gröna Stråket 8, 413 45 Gothenburg, Sweden. E-mail: claes.ohlsson{at}medic.gu.se.

Context: SHBG regulates free sex steroid levels, which in turn regulate skeletal homeostasis. Twin studies have demonstrated that genetic factors largely account for interindividual variation in SHBG levels. Glucuronidated androgen metabolites have been proposed as markers of androgenic activity.

Objective: Our objective was to investigate whether polymorphisms in the SHBG gene promoter [(TAAAA)_n microsatellite and rs1799941 single-nucleotide polymorphism] are associated with serum levels of SHBG, sex steroids, or bone mineral density (BMD) in men.

Design and Study Subjects: We conducted a population-based study of two cohorts of Swedish men: elderly men (MrOS Sweden; n 3000; average age, 75.4 yr) and young adult men (GOOD study; n = 1068; average age, 18.9 yr).

Main Outcome Measures: We measured serum levels of SHBG, testosterone, estradiol, dihydrotestosterone, 5-androstane-3,17ß-diol glucuronides, androsterone glucuronide, and BMD determined by dual-energy x-ray absorptiometry.

Results: In both cohorts, (TAAAA)_n and rs1799941 genotypes were associated with serum levels of SHBG (P < 0.001), dihydrotestosterone (P < 0.05), and 5-androstane-3,17ß-diol glucuronides (P < 0.05). In the elderly men, they were also associated with testosterone and BMD at all hip bone sites. The genotype associated with high levels of SHBG was also associated with high BMD. Interestingly, male mice overexpressing human SHBG had increased cortical bone mineral content in the femur, suggesting that elevated SHBG levels may cause increased bone mass.

Conclusions: Our findings demonstrate that polymorphisms in the SHBG promoter predict serum levels of SHBG, androgens, and glucuronidated androgen metabolites, and hip BMD in men.

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