[No authors listed]
17β-Hydroxysteroid dehydrogenase type 10 is a multifunctional, homotetrameric, mitochondrial protein encoded by the HSD17B10 gene at Xp 11.2. This protein, 17β-HSD10, is overexpressed in brain cells of Alzheimer's disease (AD) patients. It was reported to be involved in AD pathogenesis as the endoplasmic reticulum-associated amyloid-β binding protein (ERAB) and as amyloid-β binding alcohol dehydrogenase (ABAD). However, the exaggerated catalytic efficiencies for ERAB/ABAD in these reports necessitated the re-characterization of the catalytic functions of this brain enzyme. In addition to isoleucine metabolism, 17β-HSD10 is also responsible for the mitochondrial metabolism of neurosteroids such as 5α-androstane-3α,17β-diol and 17β-estradiol. These neurosteroids are inactivated by the oxidation catalyzed by 17β-HSD10. Since neurosteroid homeostasis is presumably essential for cognitive function, analysis of the impact of 17β-HSD10 and its inhibitor, amyloid-β peptide (Aβ), on the metabolism of neuroactive steroids offers a new approach to AD pathogenesis.
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