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5α-Dihydroprogesterone : ウィキペディア英語版 | 5α-Dihydroprogesterone
5α-Dihydroprogesterone (5α-DHP), also known as 5α-pregnan-3,20-dione, is an endogenous progestogen and neurosteroid that is synthesized from progesterone. It is also an intermediate in the synthesis of allopregnanolone and isopregnanolone from progesterone. 5α-DHP is an agonist of the progesterone receptor and a positive allosteric modulator of the GABAA receptor (albeit with an affinity for this receptor that is regarded as relatively low (in comparison to 3α-hydroxylated progesterone metabolites such as allopregnanolone and pregnanolone)).〔〔 It has also been found to act as a negative allosteric modulator of the GABAA-rho receptor. In addition, it is a weak agonist of the pregnane X receptor (PXR) (EC50 >10,000 µM)), with approximately six-fold lower potency relative to its 5β-isomer, 5β-dihydroprogesterone. ==See also==
* 3α-Dihydroprogesterone * Epipregnanolone * 3β-Dihydroprogesterone
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