Biology:Progestogen

From HandWiki
Short description: Steroid hormone that activates the progesterone receptor
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

Progestogens, also sometimes written progestagens or gestagens,[1] are a class of natural or synthetic steroid hormones that bind to and activate the progesterone receptors (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 and transgender hormone therapy for transgender women; for information on progestogens as medications, see the progesterone (medication) and progestogen (medication) articles.

Types and examples

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

The major tissues affected by progestogens include the uterus, vagina, cervix, breasts, testes, and brain. The main biological role of progestogens in the body is in the female reproductive system, and the male reproductive system,[19] with involvement in regulation of the menstrual cycle, maintenance of pregnancy, and preparation of the mammary glands for lactation and breastfeeding following parturition in women; in men progesterone affects spermiogenesis, sperm capacitation, and testosterone synthesis. Progestogens also have effects in other parts of the body. Unlike estrogens, progestogens have little or no role in feminization.[20]

Biochemistry

Biosynthesis

Steroidogenesis, with progestogens and their precursors inside the yellow box.[21]

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

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

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

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

Medical use

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

References

  1. ↑ 1.0 1.1 Tekoa L. King; Mary C. Brucker (25 October 2010). Pharmacology for Women's Health. Jones & Bartlett Publishers. pp. 373. ISBN 978-1-4496-5800-7. https://books.google.com/books?id=E9qVyrNPsBkC&pg=PA373. 
  2. ↑ 2.0 2.1 2.2 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. https://books.google.com/books?id=Y558dgp_PjoC&pg=PA322. 
  3. ↑ 3.0 3.1 Bhattacharya (1 January 2003). Pharmacology, 2/e. Elsevier India. p. 378. ISBN 978-81-8147-009-6. https://books.google.com/books?id=X3cCZQCrrjcC&pg=PA378. 
  4. ↑ Tara Parker-Pope (25 March 2008). The Hormone Decision. Simon and Schuster. p. 228. ISBN 978-1-4165-6201-6. https://books.google.com/books?id=jHn_XSLyvXEC&pg=PA228. 
  5. ↑ 5.0 5.1 Grant, Ellen (1994). Sexual chemistry: understanding your hormones, the Pill and HRT. Great Britain: Cedar. pp. 39. ISBN 978-0749313630. 
  6. ↑ D. T. Okpako (22 February 1991). Principles of Pharmacology: A Tropical Approach. Cambridge University Press. pp. 536–. ISBN 978-0-521-34095-3. https://books.google.com/books?id=5GcbwxQTHvMC&pg=PA536. 
  7. ↑ John Laycock; Karim Meeran (1 October 2012). Integrated Endocrinology. John Wiley & Sons. pp. 235–. ISBN 978-1-118-45057-4. https://books.google.com/books?id=v5hk3Ptf6QkC&pg=PT235. 
  8. ↑ "16α-hydroxyprogesterone: origin, biosynthesis and receptor interaction". Mol. Cell. Endocrinol. 336 (1–2): 92–101. 2011. doi:10.1016/j.mce.2010.11.016. PMID 21095220. 
  9. ↑ "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. 2007. doi:10.1016/j.ajog.2007.05.024. PMID 18060946. 
  10. ↑ Marianne J. Legato (29 October 2009). Principles of Gender-Specific Medicine. Academic Press. pp. 617–. ISBN 978-0-08-092150-1. https://books.google.com/books?id=whb9hsUgZtwC&pg=PA617. 
  11. ↑ 11.0 11.1 Bertram G. Katzung (30 November 2017). Basic and Clinical Pharmacology 14th Edition. McGraw-Hill Education. p. 728. ISBN 978-1-259-64116-9. https://books.google.com/books?id=-W5ADwAAQBAJ. "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. ↑ "Progesterone receptor-mediated effects of neuroactive steroids". Neuron 11 (3): 523–30. 1993. 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. ↑ "A specific progesterone receptor of myometrial cytosol from the rhesus monkey". J. Steroid Biochem. 8 (2): 157–60. February 1977. doi:10.1016/0022-4731(77)90040-1. PMID 405534. 
  15. ↑ "New progesterone metabolites in human myometrium". Steroids 30 (1): 1–14. July 1977. 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. ↑ "The bioassay of progesterone". Endocrinology 61 (5): 528–33. November 1957. 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. https://books.google.com/books?id=BLXoCAAAQBAJ&pg=PA610. 
  18. ↑ "The acute anticonvulsant effects of deoxycorticosterone in developing rats: role of metabolites and mineralocorticoid-receptor responses". Epilepsia 46 (12): 1888–97. 2005. doi:10.1111/j.1528-1167.2005.00295.x. PMID 16393154. 
  19. ↑ Oettel, M; Mukhopadhyay, AK (2004). "Progesterone: the forgotten hormone in men?". Aging Male 7 (3): 236–57. doi:10.1080/13685530400004199. PMID 15669543. 
  20. ↑ "Progesterone". https://www.hormone.org/your-health-and-hormones/glands-and-hormones-a-to-z/hormones/progesterone. 
  21. ↑ 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

  • Utian WH, Shoupe D, Bachmann G, Pinkerton JV, Pickar JH (June 2001). "Relief of vasomotor symptoms and vaginal atrophy with lower doses of conjugated equine estrogens and medroxyprogesterone acetate". Fertil. Steril. 75 (6): 1065–79. doi:10.1016/S0015-0282(01)01791-5. PMID 11384629.  (the Women's Health, Osteoporosis, Progestin, Estrogen study)
  • "Randomized trial of estrogen plus progestin for secondary prevention of coronary heart disease in postmenopausal women. Heart and Estrogen/progestin Replacement Study (HERS) Research Group". JAMA 280 (7): 605–13. August 1998. doi:10.1001/jama.280.7.605. PMID 9718051. 

External links




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