Dirk Vanderschueren,
Liesbeth Vandenput,
Steven Boonen,
Marie K. Lindberg,
Roger Bouillon and
Claes Ohlsson
Laboratory for Experimental Medicine and Endocrinology (D.V., L.V., S.B., R.B.), and Leuven University Centre for Metabolic Bone Diseases and Division of Geriatric Medicine (S.B.), Katholieke Universiteit Leuven, B-3000 Leuven, Belgium; and Division of Endocrinology, Department of Internal Medicine (M.K.L., C.O.), Sahlgrenska University Hospital, SE-41345 Göteborg, Sweden
Correspondence: Address all correspondence and requests for reprints to: C. Ohlsson, M.D., Ph.D., Division of Endocrinology, Department of Internal Medicine, Sahlgrenska University Hospital, SE-41345 Göteborg, Sweden. E-mail: Claes.Ohlsson{at}medic.gu.se
Loss of estrogens or androgens increases the rate of bone remodelingby removing restraining effects on osteoblastogenesis and osteoclastogenesis,and also causes a focal imbalance between resorption and formationby prolonging the lifespan of osteoclasts and shortening thelifespan of osteoblasts. Conversely, androgens, as well as estrogens,maintain cancellous bone mass and integrity, regardless of ageor sex. Although androgens, via the androgen receptor (AR),and estrogens, via the estrogen receptors (ERs), can exert theseeffects, their relative contribution remains uncertain. Recentstudies suggest that androgen action on cancellous bone dependson (local) aromatization of androgens into estrogens. However,at least in rodents, androgen action on cancellous bone canbe directly mediated via AR activation, even in the absenceof ERs.
Androgens also increase cortical bone size via stimulation ofboth longitudinal and radial growth. First, androgens, likeestrogens, have a biphasic effect on endochondral bone formation:at the start of puberty, sex steroids stimulate endochondralbone formation, whereas they induce epiphyseal closure at theend of puberty. Androgen action on the growth plate is, however,clearly mediated via aromatization in estrogens and interactionwith ER. Androgens increase radial growth, whereas estrogensdecrease periosteal bone formation. This effect of androgensmay be important because bone strength in males seems to bedetermined by relatively higher periosteal bone formation and,therefore, greater bone dimensions, relative to muscle massat older age. Experiments in mice again suggest that both theAR and ER pathways are involved in androgen action on radialbone growth. ERß may mediate growth-limiting effectsof estrogens in the female but does not seem to be involvedin the regulation of bone size in males.
In conclusion, androgens may protect men against osteoporosisvia maintenance of cancellous bone mass and expansion of corticalbone. Such androgen action on bone is mediated by the AR andER.
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