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Bioorg Med Chem Lett. 2018 Dec 1;28(22):3554-3559. doi: 10.1016/j.bmcl.2018.09.031. Epub 2018 Sep 26.

Identification of steroidal derivatives inhibiting the transformations of allopregnanolone and estradiol by 17β-hydroxysteroid dehydrogenase type 10.

Author information

1
Laboratory of Medicinal Chemistry, Endocrinology and Nephrology Unit, CHU de Québec - Research Center, Québec, QC, Canada; Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec, QC, Canada.
2
Laboratory of Medicinal Chemistry, Endocrinology and Nephrology Unit, CHU de Québec - Research Center, Québec, QC, Canada.
3
Neuroscience Unit, CHU de Québec - Research Center, Québec, QC, Canada; Faculty of Pharmacy, Université Laval, Québec, QC, Canada.
4
Laboratory of Medicinal Chemistry, Endocrinology and Nephrology Unit, CHU de Québec - Research Center, Québec, QC, Canada; Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec, QC, Canada. Electronic address: Donald.poirier@crchul.ulaval.ca.

Abstract

17β-Hydroxysteroid dehydrogenase type 10 (17β-HSD10) is a mitochondrial enzyme known for its potential role in Alzheimer's Disease (AD). 17β-HSD10, by its oxidative activity, could decrease the concentration of two important neurosteroids, allopregnanolone (ALLOP) and 17β-estradiol (E2), respectively preventing their neurogenesis and neuroprotective effects. Since the inhibition of 17β-HSD10 could lead to a new treatment for AD, we developed two biological assays using labeled ALLOP or E2 as substrates to measure the inhibitory activity of compounds against pure 17β-HSD10 protein. After the optimization of different parameters (time, concentration of enzyme, substrate and cofactor), analogs of the first reported steroidal inhibitor of 17β-HSD10 in intact cells were screened to determine their inhibitory potency for the ALLOP or the E2 oxidation. One compound, androstane derivative 5, possesses the best dual inhibition against both transformations (ALLOP, IC50 = 235 μM and E2, IC50 = 610 μM). Some compounds are dual inhibitors to a lesser extent, and others seem selective for one of the transformations in particular. By developing two reliable assays and by identifying a first generation of steroidal inhibitors of pure 17β-HSD10, this preliminary study opens the door to new and more potent inhibitors.

KEYWORDS:

17β-HSD10; Allopregnanolone; Alzheimer; Estradiol; Neurosteroids

PMID:
30297283
DOI:
10.1016/j.bmcl.2018.09.031
[Indexed for MEDLINE]

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