Modification of serum IGF-I, IGFBPS and SHBG levels by different HRT regimens

Nicoletta Biglia, Simona Ambroggio, Riccardo Ponzone, Luca Sgro, Ester Ujcic, Fabrizia Actis Dato, Piero Sismondi

Research output: Contribution to journalArticlepeer-review

Abstract

During the menopause, levels of SHBG, IGF-I and IGFBPs are significantly modified by the use of different HRT regimens. Objective: The aim of this study is to evaluate the influence of three different HRT regimens on serum levels of SHBG, IGF-I, IGFBP-1 and IGFBP-3 in postmenopausal women. Methods: 41 postmenopausal women requesting HRT were enrolled in the study. Subjects were divided in three groups according to the therapy assigned; Group A: estradiol 2 mg/day+cyproterone acetate 1 mg/day in a cyclic sequential regimen; Group B: estradiol hemihydrate 2 mg/day plus norethisterone acetate (NETA) 1 mg/day in a continuous combined regimen; Group C: estradiol hemihydrate 1 mg/day plus NETA 0.5 mg/day in a continuous combined regimen. Blood samples were drawn before the start of hormonal treatment and after 6 months of HRT. Levels of SHBG, IGF-I, IGFBP-1 and IGFBP-3 in the serum were measured by means of a specific immunoassay. Results: In group A, a significant increase of SHBG, no change of IGFBPs and a significant decrease of IGF-I were observed; in group B and in group C, no significant variations for any of the parameters were recorded. Conclusions: The association of cyproterone acetate to oral estradiol determines a significant reduction of IGF-I levels and an increase of SHBG; nevertheless, it does not seem to influence the serum levels of the IGF-I binding proteins. The treatment with oral continuous combined estrogens plus androgenic progestins, at low doses, produces minor, not significant, changes in the circulating levels of IGF-I, SHBG and IGFBPs.

Original languageEnglish
Pages (from-to)283-291
Number of pages9
JournalMaturitas
Volume45
Issue number4
DOIs
Publication statusPublished - Aug 20 2003

Keywords

  • Hormone replacement therapy (HRT)
  • IGF-I
  • IGFBPs
  • SHBG

ASJC Scopus subject areas

  • Ageing
  • Obstetrics and Gynaecology

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