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5α-Dihydroprogesterone
・ 5β-Dihydroprogesterone
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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

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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