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The effect of hormone replacement therapy on the levels of serum lipids, apolipoprotein AI, apolipoprotein B and lipoprotein (a) in Turkish postmenopausal women

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Abstract

Objectives

Estrogen replacement therapy alters the lipid profiles favorably for delaying atherosclerosis in postmenopausal women. The effects of estrogen plus progesterone combination therapy on lipids are controversial. This study was designed to evaluate the effect of female sex hormones on lipids and lipoproteins and to clarify the influence of progesterone on the effect of estrogen in postmenopausal women.

Methods

Of the 60 postmenopausal women admitted to our menopause clinic, 40 had intact uterus and received continuous 0.625 mg conjugated equine estrogen (CEE) plus 2.5 mg medroxyprogesterone acetate (MPA), whereas the remaining 20 were hysterectomized and received 0.625 mg CEE daily. To assess the alterations in lipids and lipoproteins during menopause, 45 healthy premenopausal women were investigated. Lipid and lipoprotein levels were assessed in each subject at baseline and at the 6th and 18th months of therapy.

Results

In menopause, a shift towards more atherogenic lipid and lipoprotein profiles than those of the premenopausal state was found. Following 18 months of treatment, both regimens reduced total cholesterol (TC) levels as compared with the baseline (6.4 vs. 6.9% in the CEE/MPA and CEE groups, respectively). The CEE group had a more pronounced increase in high-density lipoprotein (HDL) cholesterol than the CEE/MPA group (10.3 vs. 8.8%, respectively). Both groups displayed reduced TC, low-density lipoprotein (LDL) cholesterol and apolipoprotein-B (ApoB) concentrations, whereas triglycerides increased, with a greater tendency to increase in the CEE/MPA group at the end of the trial. Also, the lipoprotein (a) [Lp(a)] levels decreased significantly (27.6 vs. 24.5% in the CEE/MPA and CEE groups, respectively). This decrease was more pronounced in subjects with a relatively higher basal Lp(a) concentration.

Conclusion

Both treatment regimens caused positive alterations in the lipid and lipoprotein profiles. This association might play a pivotal role in the postmenopausal increases in atherosclerotic diseases and cardioprotective effect of estrogen in postmenopausal women.

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Authors and Affiliations

  1. Biochemistry Dept., Faculty of Medicine, Hacettepe University, Ankara, Turkey

    Ahmet Bayrak & Tülin Bayrak

  2. Biochemistry Dept., Faculty of Medicine, Başkent University, Ankara, Turkey

    Derya (Akaydın) Aldemir

  3. Obstetrics and Gynecology Dept., Faculty of Medicine, Kocaeli University, Kocaeli, Turkey

    Aydın Çorakçı

  4. Obstetrics and Gynecology Dept., Faculty of Medicine, Hacettepe University, 06100, Ankara, Turkey

    Polat Dursun

  5. Gecim sokak, 13/14 Cebeci, 06700, Ankara, Turkey

    Ahmet Bayrak

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  1. Ahmet Bayrak
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  4. Aydın Çorakçı
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Correspondence to Ahmet Bayrak or Polat Dursun.

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Bayrak, A., Aldemir, D.(., Bayrak, T. et al. The effect of hormone replacement therapy on the levels of serum lipids, apolipoprotein AI, apolipoprotein B and lipoprotein (a) in Turkish postmenopausal women. Arch Gynecol Obstet 274, 289–296 (2006). https://doi.org/10.1007/s00404-006-0187-2

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