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From the Departments of Cardiology (S.M.H., J.T.C.R., R.J.M., M.R.A., D.S.C.) and Medical Oncology (M.J.B.), Royal Prince Alfred Hospital, and the Heart Research Institute (J.T.C.R., R.J.M., D.S.C.), Sydney, Australia.
Correspondence to A/Prof David Celermajer, Medical Foundation Fellow, University of Sydney, Department of Cardiology, Royal Prince Alfred Hospital, Camperdown 2050, Sydney, Australia. Email davidc{at}card.rpa.cs.nsw.gov.au
Abstract Male gender is an independent risk factor for
coronary artery disease, and androgen administration has been
associated with increased atherosclerosis in
experimental animals. Since endothelial dysfunction is
an important event in the atherogenic process, we hypothesized that
androgen deprivation in adult men might be associated with
enhanced arterial endothelial function.
Using external vascular ultrasound, brachial artery diameter was
measured at rest, after flow increase (causing
endothelium-dependent dilatation) and after
nitroglycerin (an
endothelium-independent dilator). We studied 30 adult
males aged 40 to 70 years: 10 had had bilateral orchidectomy and/or
maximal androgen blockade for
6 months for treatment of prostate
cancer, and all were in complete remission (group 1). Ten healthy
controls (group 2) and 10 controls who had remission from nonprostate
cancers (group 3) were matched for age and smoking history.
Testosterone levels were lower in men in group 1 versus groups 2 or 3
(0.8±0.1 versus 19.2±8.4 or 16.1±4.9 nmol/L, P<.001). By
contrast, endothelium-dependent dilatation was markedly
higher in group 1 than in groups 2 or 3 (6.2±3 versus 2.7±2 or
2.0±1.9%, P<.001). The nitroglycerin
response was similar in all three groups (P=.92). On
multivariate analysis, increased
endothelium-dependent dilatation was significantly
associated with low serum testosterone levels (P=.001) but
not with cholesterol levels or with a past history of
malignancy (P>.25). The withdrawal of male sex hormones may
be associated with enhanced endothelial function in
adult men. This is consistent with a deleterious effect of
physiologic levels of male sex steroids on the arterial
wall.
Key Words: endothelium nitric oxide testosterone atherosclerosis
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