Английская Википедия:5α-Dihydrolevonorgestrel

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Шаблон:Short description Шаблон:Drugbox

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-Шаблон:Abbr, which bind weakly to the estrogen receptor (0.4 to 2.4% of the Шаблон:Abbr of Шаблон:Abbrlink) 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]

Шаблон:Relative affinities of levonorgestrel and metabolites

See also

References

Шаблон:Reflist


Шаблон:Androgen receptor modulators Шаблон:Estrogen receptor modulators Шаблон:Progesterone receptor modulators


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