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The term "backdoor pathway" was coined by Auchus in 2004 [28] and was described as 5α-reduction of 17α-hydroxyprogesterone (17OHP) which is a first step in a pathway that ultimately leads to the production of dihydrotestosterone (DHT). and defined as a route to DHT that: (1) bypasses conventional intermediates androstenedione (A4) and T; (2 ...
The androgen backdoor pathway (red arrows) roundabout testosterone embedded in within conventional androgen synthesis that lead to 5α-dihydrotestosterone through testosterone [27] [28] [29] CAH is a genetic disorder characterized by impaired production of cortisol in the adrenal glands. [1] [4] Production of cortisol begins at week 8 of fetal ...
This route is called the "backdoor pathway". [64] The pathway can start from 17α-hydroxyprogesterone or from progesterone and can be outlined as follows (depending on the initial substrate): 17α-hydroxyprogesterone → 5α-pregnan-17α-ol-3,20-dione → 5α-pregnane-3α,17α-diol-20-one → androsterone → 5α-androstane-3α,17β-diol → ...
The androgen backdoor pathway (red arrows) roundabout testosterone embedded in within conventional androgen synthesis that lead to 5α-dihydrotestosterone through testosterone. [ 7 ] [ 8 ] [ 9 ] 5α-Pregnan-17α-ol-3,20-dione (17-OH-DHP) is a progestogen , i.e., it binds to the progesterone receptors .
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Placental progesterone is the feedstock for the 5α-dihydrotestosterone (DHT) produced via the backdoor pathway found operating in multiple non-gonadal tissues of the fetus, [45] whereas deficiencies in this pathway lead to undervirilization of the male fetus, resulting in incomplete development of the male genitalia.
5α-Pregnane-3α,17α-diol-20-one is a metabolite, an intermediate product within the androgen backdoor pathway [17] in which 17α-hydroxyprogesterone (17-OHP) is 5α-reduced and finally converted to 5α-dihydrotestosterone (DHT) without testosterone as a metabolic intermediate.
This diagram illustrates the metabolic pathways involved in the metabolism of testosterone in humans. In addition to the transformations shown in the diagram, conjugation via sulfation and glucuronidation occurs with testosterone and metabolites that have one or more available hydroxyl (–OH) groups.