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• W2146164085 startingPage "4678" @default.
• W2146164085 abstract "Dehydroepiandrosterone (DHEA) and its sulfate derivative (DHEAS) are the most abundant steroids produced by the human adrenal, but no receptors have been identified for these steroids, and no function for them has been established, other than as precursors for sex steroid synthesis. DHEA and DHEAS are found in brains from many species, and we have shown that enzymes crucial for their synthesis, especially P450c17 (17alpha-hydroxylase/c17,20 lyase), are expressed in a developmentally regulated, region-specific fashion in the developing rodent brain. One region of embryonic expression of P450c17, the neocortical subplate, has been postulated to play a role in guiding cortical projections to their appropriate targets. We therefore determined if products of P450c17 activity, DHEA and DHEAS, regulated the motility and/or growth of neocortical neurons. In primary cultures of mouse embryonic neocortical neurons, DHEA increased the length of neurites containing the axonal marker Tau-1, and the incidence of varicosities and basket-like process formations in a dose-dependent fashion. These effects could be seen at concentrations normally found in the brain. By contrast, DHEAS had no effect on Tau-1 axonal neurites but increased the length of neurites containing the dendritic marker microtubule-associated protein-2. DHEA rapidly increased free intracellular calcium via activation of N-methyl-D-aspartate (NMDA) receptors. These studies provide evidence of mechanisms by which DHEA and DHEAS exert biological actions, show that they have specific functions other than as sex steroid precursors, mediate their effects via non-classic steroid hormone receptors, and suggest that their developmentally regulated synthesis in vivo may play crucial and different roles in organizing the neocortex." @default.
• W2146164085 created "2016-06-24" @default.
• W2146164085 creator A5043855574 @default.
• W2146164085 creator A5067026955 @default.
• W2146164085 date "1998-04-14" @default.
• W2146164085 modified "2023-10-05" @default.
• W2146164085 title "Dehydroepiandrosterone: A potential signalling molecule for neocortical organization during development" @default.
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• W2146164085 doi "https://doi.org/10.1073/pnas.95.8.4678" @default.
• W2146164085 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/22550" @default.
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• W2146164085 hasPublicationYear "1998" @default.
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