CAG repeat length in the androgen receptor gene and gonadotrophin suppression influence the effectiveness of hormonal male contraception.

Abstract:

OBJECTIVE:Nonuniformity in suppression of spermatogenesis induced by various hormones or hormone combinations has impeded the development of an effective hormonal male contraceptive. The basis for this heterogeneity in response remained unresolved to date; however, the presence of ethnic differences points to an involvement of genetic factors. PATIENTS AND MEASUREMENTS:In a retrospective analysis we investigated the impact of a CAG repeat polymorphism in the androgen receptor and polymorphic sites in the oestrogen and FSH receptor genes on spermatogenic suppression in 85 Caucasian men treated with different regimens of hormonal contraception. RESULTS:Failure to reduce sperm concentrations below 3 million/ml was significantly associated with insufficient suppression of gonadotrophins. The extent of gonadotrophin suppression was not explained by any polymorphism but was primarily pharmacological, resulting from addition of gestagens to testosterone. When LH and FSH suppression was rapid and persistent none of the polymorphisms studied explained why some men failed to achieve azoospermia. In cases with incomplete gonadotrophin suppression the chances of becoming azoospermic were 2.5 times higher in men having more than 22 CAG repeats. CONCLUSIONS:In summary, our analysis shows that in a subset of men, effective hormonal male contraception can be achieved even in the absence of complete gonadotrophin suppression.

journal_name

Clin Endocrinol (Oxf)

journal_title

Clinical endocrinology

authors

Eckardstein SV,Schmidt A,Kamischke A,Simoni M,Gromoll J,Nieschlag E

doi

10.1046/j.1365-2265.2002.01652.x

keywords:

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

647-55

issue

5

eissn

0300-0664

issn

1365-2265

pii

1652

journal_volume

57

pub_type

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