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|Section2= |Section3= }} Allopregnanolone (3α-hydroxy-5α-pregnan-20-one or 3α,5α-tetrahydroprogesterone), generally abbreviated as ALLO or as 3α,5α-THP, is an endogenous inhibitory pregnane neurosteroid. It is synthesized from progesterone, and is a potent positive allosteric modulator of the GABAA receptor.〔 Allopregnanolone has effects similar to those of other potentiators of the GABAA receptor such as the benzodiazepines, including anxiolytic, sedative, and anticonvulsant activity.〔 The 21-hydroxylated derivative of this compound, tetrahydrodeoxycorticosterone (THDOC), is an endogenous inhibitory neurosteroid with similar properties to those of allopregnanolone, and the 3β-methyl analogue of allopregnanolone, ganaxolone, is under development to treat epilepsy and other conditions.〔 ==Biosynthesis== The biosynthesis of allopregnanolone starts with the conversion of progesterone into 5α-dihydroprogesterone by 5α-reductase type I. After that, 3α-hydroxysteroid dehydrogenase converts this intermediate into allopregnanolone.〔 Depression, anxiety, and sexual dysfunction are frequently-seen side effects of 5α-reductase inhibitors such as finasteride, and are thought to be caused, in part, by interfering with the normal production of allopregnanolone. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Allopregnanolone」の詳細全文を読む スポンサード リンク
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