Progestogen

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Progestogen
Drug class
Progesterone.svg
Progesterone, the major progestogen in humans and a widely used medication.
Class identifiers
SynonymsProgestagens; Gestagens
UseContraception, menopause, hypogonadism, transgender women, others
ATC codeG03D
Biological targetProgesterone receptors (PRA, PRB, PRC, mPRs (e.g., mPRα, mPRβ, mPRγ, mPRδ, others))
External links
MeSHD011372
In Wikidata

Progestogens, also sometimes written progestagens or gestagens,[1] are a class of steroid hormones that bind to and activate the progesterone receptor (PR).[2][3] Progesterone is the major and most important progestogen in the body. The progestogens are named for their function in maintaining pregnancy (i.e., progestational), although they are also present at other phases of the estrous and menstrual cycles.[2][3]

The progestogens are one of three types of sex hormones, the others being estrogens like estradiol and androgens/anabolic steroids like testosterone. In addition, they are one of the five major classes of steroid hormones, the others being the androgens, estrogens, glucocorticoids, and mineralocorticoids, as well as the neurosteroids. All endogenous progestogens are characterized by their basic 21-carbon skeleton, called a pregnane skeleton (C21). In similar manner, the estrogens possess an estrane skeleton (C18), and androgens, an androstane skeleton (C19).

The terms progesterone, progestogen, and progestin are mistakenly used interchangeably both in the scientific literature and in clinical settings.[1][4][5] Progestins are synthetic progestogens and are used in medicine.[2] Major examples of progestins include the 17α-hydroxyprogesterone derivative medroxyprogesterone acetate and the 19-nortestosterone derivative norethisterone. The progestins are structural analogues of progesterone and have progestogenic activity similarly, but differ from progesterone in their pharmacological properties in various ways.[5]

In addition to their roles as natural hormones, progestogens are used as medications, for instance in menopausal hormone therapy; for information on progestogens as medications, see the progesterone (medication) and progestin articles.

Types and examples[edit]

The most important progestogen in the body is progesterone (P4).[6][7] Other endogenous progestogens, with varying degrees of progestogenic activity, include 16α-hydroxyprogesterone (16α-OHP),[8] 17α-hydroxyprogesterone (17α-OHP) (very weak),[9] 20α-dihydroprogesterone (20α-DHP),[10][11] 20β-dihydroprogesterone (20β-DHP),[11] 5α-dihydroprogesterone (5α-DHP),[12] 5β-dihydroprogesterone (5β-DHP) (very weak),[13][14] 3β-dihydroprogesterone (3β-DHP),[15][16] 11-deoxycorticosterone (DOC),[17] and 5α-dihydrodeoxycorticosterone (5α-DHDOC).[18] They are all metabolites of progesterone, lying downstream of progesterone in terms of biosynthesis.

Biological function[edit]

The major tissues affected by progestogens include the uterus, vagina, cervix, breasts, and brain. The main biological role of progestogens in the body is in the female reproductive system, with involvement in regulation of the menstrual cycle, maintenance of pregnancy, and preparation of the mammary glands for lactation and breastfeeding following parturition. Progestogens also have effects in other parts of the body. Unlike estrogens, progestogens have little or no role in feminization.

Biochemistry[edit]

Biosynthesis[edit]

Steroidogenesis, with progestogens and their precursors inside the yellow box.[19]

Progesterone is produced from cholesterol with pregnenolone as a metabolic intermediate. In the first step in the steroidogenic pathway, cholesterol is converted into pregnenolone, which serves as the precursor to the progestogens progesterone and 17α-hydroxyprogesterone. These progestogens, along with another steroid, 17α-hydroxypregnenolone, are the precursors of all other endogenous steroids, including the androgens, estrogens, glucocorticoids, mineralocorticoids, and neurosteroids. Thus, many tissues producing steroids, including the adrenal glands, testes, and ovaries, produce progestogens.

In some tissues, the enzymes required for the final product are not all located in a single cell. For example, in ovarian follicles, cholesterol is converted to androstenedione, an androgen, in the theca cells, which is then further converted into estrogen in the granulosa cells. Fetal adrenal glands also produce pregnenolone in some species, which is converted into progesterone and estrogens by the placenta (see below). In the human, the fetal adrenals produce dehydroepiandrosterone (DHEA) via the pregnenolone pathway.

Ovarian production[edit]

Progesterone is the major progestogen produced by the corpus luteum of the ovary in all mammalian species. Luteal cells possess the necessary enzymes to convert cholesterol to pregnenolone, which is subsequently converted into progesterone. Progesterone is highest in the diestrus phase of the estrous cycle.

Placental production[edit]

The role of the placenta in progestogen production varies by species. In the sheep, horse, and human, the placenta takes over the majority of progestogen production, whereas in other species the corpus luteum remains the primary source of progestogens. In the sheep and human, progesterone is the major placental progestogen.

The equine placenta produces a variety of progestogens, primarily 5α-dihydroprogesterone and 5α,20α-tetrahydroprogesterone, beginning on day 60. A complete luteo-placental shift occurs by day 120–150.

Chemistry[edit]

The endogenous progestogens are naturally occurring pregnane steroids with ketone and/or hydroxyl groups at the C3 and C20 positions.

Medical use[edit]

Progestogens, including both progestins and progesterone, are used medically in hormonal contraception, hormone therapy, to treat gynecological disorders, to suppress sex hormone levels for various purposes, and for other indications.

References[edit]

  1. ^ a b Tekoa L. King; Mary C. Brucker (25 October 2010). Pharmacology for Women's Health. Jones & Bartlett Publishers. p. 373. ISBN 978-1-4496-5800-7.
  2. ^ a b c Michelle A. Clark; Richard A. Harvey; Richard Finkel; Jose A. Rey; Karen Whalen (15 December 2011). Pharmacology. Lippincott Williams & Wilkins. p. 322. ISBN 978-1-4511-1314-3.
  3. ^ a b Bhattacharya (1 January 2003). Pharmacology, 2/e. Elsevier India. p. 378. ISBN 978-81-8147-009-6.
  4. ^ Tara Parker-Pope (25 March 2008). The Hormone Decision. Simon and Schuster. p. 228. ISBN 978-1-4165-6201-6.
  5. ^ a b Grant, Ellen (1994). Sexual chemistry: understanding your hormones, the Pill and HRT. Great Britain: Cedar. p. 39. ISBN 0749313633.
  6. ^ D. T. Okpako (22 February 1991). Principles of Pharmacology: A Tropical Approach. Cambridge University Press. pp. 536–. ISBN 978-0-521-34095-3.
  7. ^ John Laycock; Karim Meeran (1 October 2012). Integrated Endocrinology. John Wiley & Sons. pp. 235–. ISBN 978-1-118-45057-4.
  8. ^ Storbeck KH, Swart P, Africander D, Conradie R, Louw R, Swart AC (2011). "16α-hydroxyprogesterone: origin, biosynthesis and receptor interaction". Mol. Cell. Endocrinol. 336 (1–2): 92–101. doi:10.1016/j.mce.2010.11.016. PMID 21095220.
  9. ^ Attardi BJ, Zeleznik A, Simhan H, Chiao JP, Mattison DR, Caritis SN (2007). "Comparison of progesterone and glucocorticoid receptor binding and stimulation of gene expression by progesterone, 17-alpha hydroxyprogesterone caproate, and related progestins". Am. J. Obstet. Gynecol. 197 (6): 599.e1–7. doi:10.1016/j.ajog.2007.05.024. PMC 2278032. PMID 18060946.
  10. ^ Marianne J. Legato (29 October 2009). Principles of Gender-Specific Medicine. Academic Press. pp. 617–. ISBN 978-0-08-092150-1.
  11. ^ a b Bertram G. Katzung (30 November 2017). Basic and Clinical Pharmacology 14th Edition. McGraw-Hill Education. p. 728. ISBN 978-1-259-64116-9. In addition to progesterone, 20α- and 20β-hydroxyprogesterone (20α- and 20β-hydroxy-4-pregnene-3-one) also are found. These compounds have about one-fifth the progestational activity of progesterone in humans and other species.
  12. ^ Rupprecht R, Reul JM, Trapp T, van Steensel B, Wetzel C, Damm K, Zieglgänsberger W, Holsboer F (1993). "Progesterone receptor-mediated effects of neuroactive steroids". Neuron. 11 (3): 523–30. doi:10.1016/0896-6273(93)90156-l. PMID 8398145.
  13. ^ Lima-Hernández, Francisco J.; Beyer, Carlos; Gómora-Arrati, Porfirio; García-Juárez, Marcos; Encarnación-Sánchez, José L.; Etgen, Anne M.; González-Flores, Oscar (2012). "Src kinase signaling mediates estrous behavior induced by 5β-reduced progestins, GnRH, prostaglandin E2 and vaginocervical stimulation in estrogen-primed rats". Hormones and Behavior. 62 (5): 579–584. doi:10.1016/j.yhbeh.2012.09.004. ISSN 0018-506X. PMID 23010621.
  14. ^ Illingworth DV, Elsner C, De Groot K, Flickinger GL, Mikhail G (February 1977). "A specific progesterone receptor of myometrial cytosol from the rhesus monkey". J. Steroid Biochem. 8 (2): 157–60. PMID 405534.
  15. ^ Junkermann H, Runnebaum B, Lisboa BP (July 1977). "New progesterone metabolites in human myometrium". Steroids. 30 (1): 1–14. doi:10.1016/0039-128X(77)90131-3. PMID 919010. In the Clauberg bioassay the 3β-hydroxy-4-pregnen-20-one shows about the same potency as progesterone (34). In regard to the biological activity of the 3α epimer no data are available.
  16. ^ Pincus G, Miyake T, Merrill AP, Longo P (November 1957). "The bioassay of progesterone". Endocrinology. 61 (5): 528–33. doi:10.1210/endo-61-5-528. PMID 13480263.
  17. ^ The Adrenocortical Hormones: Their Origin · Chemistry, Physiology, and Pharmacology. Springer Science & Business Media. 27 November 2013. pp. 610–. ISBN 978-3-642-88385-9.
  18. ^ Edwards HE, Vimal S, Burnham WM (2005). "The acute anticonvulsant effects of deoxycorticosterone in developing rats: role of metabolites and mineralocorticoid-receptor responses". Epilepsia. 46 (12): 1888–97. doi:10.1111/j.1528-1167.2005.00295.x. PMID 16393154.
  19. ^ Häggström, Mikael; Richfield, David (2014). "Diagram of the pathways of human steroidogenesis". WikiJournal of Medicine. 1 (1). doi:10.15347/wjm/2014.005. ISSN 2002-4436.

Further reading[edit]

External links[edit]