5α-Dihydrolevonorgestrel

5α-Dihydrolevonorgestrel
Clinical data
Synonyms 5α-Dihydrolevonorgestrel; 5α-DHLNG; 5α-LNG
Identifiers
CAS Number
PubChem CID
ChemSpider
UNII
Chemical and physical data
Formula C21H30O2
Molar mass 314.469 g/mol
3D model (JSmol)

5α-Dihydrolevonorgestrel (5α-DHLNG) is an active metabolite of the progestin levonorgestrel which is formed by 5α-reductase.[1][2] It has about one-third of the affinity of levonorgestrel for the progesterone receptor.[1] In contrast to levonorgestrel, the compound has both progestogenic and antiprogestogenic activity, and hence has a selective progesterone receptor modulator-like profile of activity.[3][4] This is analogous to the case of norethisterone and 5α-dihydronorethisterone.[3][5] In addition to the progesterone receptor, 5α-DHLNG interacts with the androgen receptor.[6] It has similar affinity for the androgen receptor relative to levonorgestrel (34.3% of that of metribolone for levonorgestrel and 38.0% of that of metribolone for 5α-DHLNG), and has androgenic effects similarly to levonorgestrel and testosterone.[6] 5α-DHLNG is further transformed into 3α,5α- and 3β,5α-THLNG, which bind weakly to the estrogen receptor (0.4 to 2.4% of the RBA of E2) and have weak estrogenic activity.[7][8][4] These metabolites are considered to be responsible for the weak estrogenic activity of high doses of levonorgestrel.[8][4]

Relative affinities (%) of levonorgestrel and metabolites[1][9][8][6]
CompoundPRARERGRMRSHBGCBG
Levonorgestrel150–16234a, 4501–817–75500
5α-Dihydrolevonorgestrel5038a0????
3α,5α-Tetrahydrolevonorgestrel??0.4????
3β,5α-Tetrahydrolevonorgestrel??2.4????
Values are percentages (%). Reference ligands (100%) were promegestone for the PR, metribolone (a = mibolerone) for the AR, E2 for the ER, DEXA for the GR, aldosterone for the MR, DHT for SHBG, and cortisol for CBG.

See also

References

  1. 1 2 3 Kuhl H (2005). "Pharmacology of estrogens and progestogens: influence of different routes of administration" (PDF). Climacteric. 8 Suppl 1: 3–63. doi:10.1080/13697130500148875. PMID 16112947.
  2. ↑ Schindler AE, Campagnoli C, Druckmann R, Huber J, Pasqualini JR, Schweppe KW, Thijssen JH (2008). "Classification and pharmacology of progestins". Maturitas. 61 (1–2): 171–80. PMID 19434889.
  3. 1 2 Vij U, Murugesan K, Kalita JC, Farooq A (February 1989). "Interaction of antiprogestins with progesterone receptors in rat uterus". J. Steroid Biochem. 32 (2): 279–82. PMID 2921869.
  4. 1 2 3 García-Becerra R, Borja-Cacho E, Cooney AJ, Jackson KJ, Lemus AE, Pérez-Palacios G, Larrea F (November 2002). "The intrinsic transcriptional estrogenic activity of a non-phenolic derivative of levonorgestrel is mediated via the estrogen receptor-alpha". J. Steroid Biochem. Mol. Biol. 82 (4–5): 333–41. PMID 12589940.
  5. ↑ Chu YH, Li QA, Zhao ZF, Zhou YP, Cao DC (1985). "[Antiprogestational action of 5 alpha-dihydronorethisterone]". Zhongguo Yao Li Xue Bao (in Chinese). 6 (2): 125–9. PMID 2934946.
  6. 1 2 3 Cabeza M, Vilchis F, Lemus AE, Díaz de León L, Pérez-Palacios G (September 1995). "Molecular interactions of levonorgestrel and its 5 alpha-reduced derivative with androgen receptors in hamster flanking organs". Steroids. 60 (9): 630–5. doi:10.1016/0039-128X(95)00075-2. PMID 8545853.
  7. ↑ Khan FS, Fotherby K (April 1979). "In vitro metabolism of 17 alpha-ethynylsteroids". J. Steroid Biochem. 10 (4): 437–42. PMID 449320.
  8. 1 2 3 Santillán R, Pérez-Palacios G, Reyes M, Damián-Matsumura P, García GA, Grillasca I, Lemus AE (September 2001). "Assessment of the oestrogenic activity of the contraceptive progestin levonorgestrel and its non-phenolic metabolites". Eur. J. Pharmacol. 427 (2): 167–74. doi:10.1016/S0014-2999(01)01263-8. PMID 11557270.
  9. ↑ Philibert D, Bouchoux F, Degryse M, Lecaque D, Petit F, Gaillard M (October 1999). "The pharmacological profile of a novel norpregnance progestin (trimegestone)". Gynecol. Endocrinol. 13 (5): 316–26. doi:10.3109/09513599909167574. PMID 10599548.


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