title: Vitamin D(3) enhances ATRA-mediated neurosteroid biosynthesis in human glioma GI-1 cells.
abstract: Emerging evidence indicates that vitamin D (VD) is an important modulator of brain development and function. To investigate whether VD modulates neurosteroid biosynthesis in neural cells, we investigated the effect of VD(3) on steroidogenic gene expression in human glioma GI-1 cells. We found that VD(3) enhanced CYP11A1 and 3β-hydroxysteroid dehydrogenase gene expression. The induction of CYP11A1 gene expression by VD(3) was dose- and incubation time-dependent. Calcipotriol, a VD(3) receptor (VDR) agonist, also induced CYP11A1 gene expression in GI-1 cells, indicating that VDR is involved in this induction. The induction of progesterone (PROG) de novo synthesis was observed along with the induction of steroidogenic genes by VD(3). Furthermore, VD(3) enhanced all-trans retinoic acid (ATRA)-induced CYP11A1 gene expression and PROG production. This suggests cooperative regulation of steroidogenic gene expression by the two fat-soluble vitamins, A and D. In addition, a mixed culture of neuronal IMR-32 cells and GI-1 cells treated with ATRA and VD(3) resulted in the induction of PROG-responsive gene expression in the IMR-32 cells. This result shows a paracrine action of PROG that is induced in and released by the GI-1 cells. The relationship between neurological dysfunction associated with VD deficiency and neurosteroid induction by VD is discussed.
authors: Department of Pharmacy, Graduate School of Pharmaceutical Sciences, Keio University, 1-5-30, Shibakoen, Minatoku, Tokyo 105-8512, Japan.
authors: Toshiaki
authors: T
authors: Yagishita
authors: Akira
authors: A
authors: Kushida
authors: Hiroomi
authors: H
authors: Tamura
mesh_terms: D053898:Biosynthetic Pathways / Q000187:drug effects / Q000235:genetics; D045744:Cell Line, Tumor; D002762:Cholecalciferol / Q000494:pharmacology*; D002786:Cholesterol Side-Chain Cleavage Enzyme / Q000096:biosynthesis / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D005910:Glioma / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D018377:Neurotransmitter Agents / Q000096:biosynthesis* / Q000737:chemistry; D019899:Paracrine Communication / Q000187:drug effects / Q000235:genetics; D015533:Transcriptional Activation / Q000187:drug effects; D014212:Tretinoin / Q000494:pharmacology*
chemical_list: D018377:Neurotransmitter Agents; D002762:Cholecalciferol; D014212:Tretinoin; D002786:Cholesterol Side-Chain Cleavage Enzyme