Characterization of the dehydroepiandrosterone (DHEA) metabolism via oxysterol 7α-hydroxylase and 17-ketosteroid reductase activity in the human brain
Steckelbroeck, Stephan ; Watzka, Matthias ; Lütjohann, Dieter ; Makiola, Paul ; Nassen, Alexander ; Hans, Volkmar H. J. ; Clusmann, Hans ; Reissinger, Annette ; Ludwig, Michael ; Siekmann, Lothar ; Klingmüller, Dietrich
Oxford, UK : Blackwell Science Ltd
Published 2002
Oxford, UK : Blackwell Science Ltd
Published 2002
ISSN: |
1471-4159
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Source: |
Blackwell Publishing Journal Backfiles 1879-2005
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Topics: |
Medicine
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Notes: |
Dehydroepiandrosterone and its sulphate are important factors for vitality, development and functions of the CNS. They were found to be subjects to a series of enzyme-mediated conversions within the rodent CNS. In the present study, we were able to demonstrate for the first time that membrane-associated dehydroepiandrosterone 7α-hydroxylase activity occurs within the human brain. The cytochrome P450 enzyme demonstrated a sharp pH optimum between 7.5 and 8.0 and a mean KM value of 5.4 µm, corresponding with the presence of the oxysterol 7α-hydroxylase CYP7B1. Real-time RT–PCR analysis verified high levels of CYP7B1 mRNA expression in the human CNS. The additionally observed conversion of dehydroepiandrosterone via cytosolic 17β-hydroxysteroid dehydrogenase activity could be ascribed to the activity of an enzyme with a broad pH optimum and an undetectably high KM value. Subsequent experiments with cerebral neocortex and subcortical white matter specimens revealed that 7α-hydroxylase activity is significantly higher in the cerebral neocortex than in the subcortical white matter (p 〈 0.0005), whereas in the subcortical white matter, 17β-hydroxysteroid dehydrogenase activity is significantly higher than in the cerebral neocortex (p 〈 0.0005). No sex differences were observed. In conclusion, the high levels of CYP7B1 mRNA in brain tissue as well as in a variety of other tissues in combination with the ubiquitous presence of 7α-hydroxylase activity in the human temporal lobe led us to assume a neuroprotective function of the enzyme such as regulation of the immune response or counteracting the deleterious effects of neurotoxic glucocorticoids, rather than a distinct brain specific function such as neurostimulation or neuromodulation.
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Type of Medium: |
Electronic Resource
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URL: |