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Progestogens in Menopausal Hormone Therapy

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Progestogens in Menopausal Hormone Therapy DOI: 10.5114/pm.2015.52154 Prz Menopauzalny 2015; 14(2): 134-143 Review papeR Progestogens in menopausal hormone therapy Małgorzata Bińkowska1, Jarosław Woroń2 11st Department of Obstetrics and Gynaecology, Centre of Postgraduate Medical Education, Warsaw, Poland 2Department of Clinical Pharmacology, Chair of Pharmacology, Faculty of Medicine, Jagiellonian University Medical College, Cracow, Poland Abstract Progestogens share one common effect: the ability to convert proliferative endometrium to its secretory form. In contrast, their biological activity is varied, depending on the chemical structure, pharmacokinetics, receptor affinity and different potency of action. Progestogens are widely used in the treatment of menstru- al cycle disturbances, various gynaecological conditions, contraception and menopausal hormone therapy. The administration of progestogen in menopausal hormone therapy is essential in women with an intact uterus to protect against endometrial hyperplasia and cancer. Progestogen selection should be based on the charac- teristics available for each progestogen type, relying on the assessment of relative potency of action in experi- mental models and animal models, and on the indirect knowledge brought by studies of the clinical use of dif- ferent progestogen formulations. The choice of progestogen should involve the conscious use of knowledge of its benefits, with a focus on minimizing potential side effects. Unfortunately, there are no direct clinical studies comparing the metabolic effects of different progestogens. Key words: progestogens, menopausal hormone therapy, progesterone, progestin. Introduction mechanisms. In addition, progestogens modulate gene Progestogens are substances exhibiting a proge- transcription due to their affinity to other steroid recep- stagenic effect, i.e. inducing secretory transformation tors: androgen receptor (AR), glucocorticoid receptor in the endometrium which was previously affected by (GR) and mineralocorticoid receptor (MR). Studies of af- oestrogens, thus mimicking the activity of endogenous finity, as well as the type and relative potency of action progesterone in the luteal phase of the menstrual cycle. of different progestogens, are based on experiments Although progestogens are currently widely used in conducted on animal models and human cell lines and gynaecology, and not uncommonly also in obstetrics, tissues. However, biological response may differ depend- the body of knowledge about progestogens, as well as ing on the achieved concentration, duration of action terminology, appears rather chaotic and insufficiently and effects caused by adjacent structures and tissues. systematized. A variety of interchangeable names are The biological activity of progestogens is varied and used, including progestagen, progestogen, gestagen, influenced by their chemical structure, pharmacokinet- gestogen and progestin. According to the recommenda- ics and potency of action (Table II). The metabolism of tions issued by the North American Menopause Society, progestogens is still poorly understood, however it is the present study uses the term “progestogen”, by anal- definitely determined by the route of administration, ogy to other classes of hormonal drugs, e.g. oestrogens among other factors. Following oral administration, or androgens, and the term “progestin” which refers to progestogens are partially metabolized by enzymes pro- synthetic progestogens, i.e. excludes progesterone [1]. duced by bacteria living in the stomach and small in- Classification of progestogens is shown in Table I. testine, and during the process of mucosal absorption. Progestogens produce their physiological and biolog- After reaching the liver, the “first passage effect” is ob- ical effects via the progesterone receptors A (PR-A) and B served, i.e. an intensive metabolic process involving pri- (PR-B). Both of them are nuclear receptors, the difference marily cytochrome P450 enzymes. The liver is the main being that PR-B has an additional amino acid sequence site for the metabolism of progestogens also when they at the terminal NH2 group. In experimental conditions are administered via other routes. Some progestins (e.g. progestins bind to both progesterone receptors with desogestrel or norgestimate) are pro-drugs, i.e. become a high, though varied, affinity. The expression of genes active only through the formation of metabolites. Final- by PR is regulated through different, also extragenomic, ly, due to the activity of sulphatases, some conjugated Corresponding author: Małgorzata Bińkowska, 1st Department of Obstetrics and Gynecology, Centre of Postgraduate Medical Submitted: 29.04.2015 Education, 231 Czerniakowska St., 00-416 Warsaw, Poland, e-mail: [email protected] Accepted: 1.06.2015 134 Menopause Review/Przegląd Menopauzalny 14(2) 2015 metabolites may be subject to secondary absorption in and exerts marked antimineralocorticoid and antian- the intestine and repeated activity. drogenic effects as a result of competitive inhibition of Indications for progestogen treatment in the pre- 5α-reductase activity in the skin. menopausal period are menstrual disorders affecting After oral administration P is rapidly metabolized in both the frequency of the menstrual cycle (polymenor- the gastrointestinal tract and liver, producing up to 30 rhea, oligomenorrhea) and the severity of bleeding (hy- metabolites. Among them, 5α- and 5β-pregnanolones pomenorrhea, hypermenorrhea), and heavy prolonged have a sedative effect through binding to the GABAA bleeding without an underlying organic condition. Some (gamma-aminobutyric acid type A) receptor. Other im- progestins are used as contraceptives, either alone or in portant metabolites include 20-dihydroprogesterone conjunction with oestrogen. (25-50% of progestogen potency), 11-deoxycorticos- The only indication for progestogen use during men- terone (strong mineralocorticosteroid), 17α-hydroxy- opausal hormone therapy (MHT) is to protect the uter- progesterone and the inactive end product – pregnan- us from endometrial hyperplasia and thus eliminate the ediol. The proportions of metabolites show a very high risk of endometrial cancer which would be induced by degree of individual variation. Low bioavailability after the prolonged use of unbalanced oestrogens [2]. oral administration was improved by micronization and The selection of progestogens for therapy should be then encapsulation of micronized progesterone sus- based on the available knowledge of their mechanisms pended in oil in gel capsules. Following oral administra- of action and differences between them. The bioavail- tion of 200 mg of progesterone in this form, the maximum ability of different progestogens depends on multiple P concentration determined by RIA (radioimmunoassay) factors including the route of administration, metabo- occurs after 4 hours and amounts to 12 ng/ml, lism, protein-binding strength and additional binding to the concentration of 5α-pregnanolon is 30 ng/ml and other steroid receptors (AR, GR, MR) and action triggered 5β-pregnanolon – 60 ng/ml. Approximately 17% of cir- via this pathway. Progestogens vary in their activity (not culating P is bound with a high affinity to CBG, and 80% only as a result of differences in chemical structure but is bound with low affinity to albumins. also in the strength of binding to different receptors), Oral micronized progesterone (MP) preparations are intracellular activity and often also biological and clini- used in MHT at daily doses of 200-300 mg, ensuring cal effects. What is more, they may exhibit differences in sufficient protection against endometrial hyperplasia the safety profile and the risk of interactions with other with a standard oestrogen dose. In sequential therapy, drugs used concomitantly in combination therapy. combining MP at a dose of 200 mg for 12-14 days with Another important factor affecting the pharmacoki- oral or transdermal oestrogen at a standard dose pre- netics of all drugs, progestogens included, is the aging vents endometrial hyperplasia, causing regular with- process. Changes arise as a result of deteriorated liver drawal bleeding in 60% of women and amenorrhoea function (impairment of the cytochrome P450 system, in a part of the remaining group. MP at a lower dose modified activity of P-glycoprotein) and kidney func- (100 mg) administered for 21-25 days of the cycle in tion, but also reduced cardiac output and decline in conjunction with 150 µg of oestradiol via the transder- lung function. Another factor which merits considera- mal route improved tolerance (reduced drowsiness, tion is the reduction of conjugation processes occurring tiredness and dizziness), and increased the percentage in the liver, which is important for the metabolism and of amenorrhoea. clearance of certain progestogens. It is usually accom- The intramuscular form of MP in oil (50-100 mg dai- panied by changes in body weight and composition, ly), which is still available in some countries, is mainly and aging-related decreased muscle mass. The factors used today in in vitro fertilization programmes. Clinical should be taken into account in differentiating treat- trials are currently under way investigating an aque- ment and drug doses between perimenopausal and el- ous solution for subcutaneous administration which, at derly women (over 65 years of age). a dose of 25 mg, would deliver a similar effect as intra- vaginal gel at a daily dose of 90 mg. Intravaginal progesterone in the form of 8% gel Progesterone (90 mg) or tablets (200 mg)
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