OBJECTIVE: It was hypothesized that aromatase inhibitor (AI)-induced interruption of estradiol negative feedback would modulate the reproductive hormone profile of obese women. METHODS: Regularly cycling women aged 18-40 years with a BMI of 18-25 kg/m(2) (normal weight, n = 10) or >30 kg/m(2) (obese; n = 12) were given AI daily for 7 days. Urinary hormone profiles were compared between groups. Fourteen eumenorrheic, normal weight women not receiving AI stimulation served as historical controls. Urinary metabolites for LH, FSH, estradiol (E1c), and progesterone (Pdg) were measured and normalized to a 28-day cycle. Serum estrone and estradiol were measured in the late follicular phase. RESULTS: Whole-cycle LH, FSH, and luteal Pdg excretion did not differ between obese (BMI = 37.1 + 7 kg/m(2) ) and normal weight women treated with AIs, although LH was greater in stimulated compared with unstimulated normal weight women. Whole cycle mean E1c was lower in AI-stimulated obese and normal weight participants compared with nonstimulated normal weight controls, but obese women treated with AI excreted far less E1c (467.7 ± 217.4 μg/mg Cr) than AI-treated normal weight women (911.4 ± 361.8 μg/mg Cr; P = 0.02). Follicular phase serum estrone and estradiol were also lower in AI-treated obese women versus AI-treated normal weight women (61.7 ± 22.8 and 18.3 ± 3.7 pg/ml versus 99.1 ± 30.5 and 37.7 ± 5.9 pg/ml, respectively; P = 0.034 and 0.005). CONCLUSIONS: Normal gonadotropin output and luteal function occur at the expense of reduced E1c excretion in AI-treated women, and this discrepancy is particularly evident in obese women.
OBJECTIVE: It was hypothesized that aromatase inhibitor (AI)-induced interruption of estradiol negative feedback would modulate the reproductive hormone profile of obesewomen. METHODS: Regularly cycling women aged 18-40 years with a BMI of 18-25 kg/m(2) (normal weight, n = 10) or >30 kg/m(2) (obese; n = 12) were given AI daily for 7 days. Urinary hormone profiles were compared between groups. Fourteen eumenorrheic, normal weight women not receiving AI stimulation served as historical controls. Urinary metabolites for LH, FSH, estradiol (E1c), and progesterone (Pdg) were measured and normalized to a 28-day cycle. Serum estrone and estradiol were measured in the late follicular phase. RESULTS: Whole-cycle LH, FSH, and luteal Pdg excretion did not differ between obese (BMI = 37.1 + 7 kg/m(2) ) and normal weight women treated with AIs, although LH was greater in stimulated compared with unstimulated normal weight women. Whole cycle mean E1c was lower in AI-stimulated obese and normal weight participants compared with nonstimulated normal weight controls, but obesewomen treated with AI excreted far less E1c (467.7 ± 217.4 μg/mg Cr) than AI-treated normal weight women (911.4 ± 361.8 μg/mg Cr; P = 0.02). Follicular phase serum estrone and estradiol were also lower in AI-treated obesewomen versus AI-treated normal weight women (61.7 ± 22.8 and 18.3 ± 3.7 pg/ml versus 99.1 ± 30.5 and 37.7 ± 5.9 pg/ml, respectively; P = 0.034 and 0.005). CONCLUSIONS: Normal gonadotropin output and luteal function occur at the expense of reduced E1c excretion in AI-treated women, and this discrepancy is particularly evident in obesewomen.
Authors: A Sioufi; N Gauducheau; V Pineau; F Marfil; A Jaouen; J M Cardot; J Godbillon; C Czendlik; H Howald; C Pfister; F Vreeland Journal: Biopharm Drug Dispos Date: 1997-12 Impact factor: 1.627
Authors: N Santoro; S L Crawford; J E Allsworth; E B Gold; G A Greendale; S Korenman; B L Lasley; D McConnell; P McGaffigan; R Midgely; M Schocken; M Sowers; G Weiss Journal: Am J Physiol Endocrinol Metab Date: 2002-11-19 Impact factor: 4.310
Authors: Jan Willem van der Steeg; Pieternel Steures; Marinus J C Eijkemans; J Dik F Habbema; Peter G A Hompes; Jan M Burggraaff; G Jur E Oosterhuis; Patrick M M Bossuyt; Fulco van der Veen; Ben W J Mol Journal: Hum Reprod Date: 2007-12-11 Impact factor: 6.918
Authors: Nanette Santoro; Bill Lasley; Dan McConnell; Jenifer Allsworth; Sybil Crawford; Ellen B Gold; Joel S Finkelstein; Gail A Greendale; Jenny Kelsey; Stan Korenman; Judith L Luborsky; Karen Matthews; Rees Midgley; Lynda Powell; Janice Sabatine; Miriam Schocken; Mary Fran Sowers; Gerson Weiss Journal: J Clin Endocrinol Metab Date: 2004-06 Impact factor: 5.958