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Vitamin D Analogs Regulate the Vitamin D System and Cell Viability in Ovarian Cancer Cells

Overview
Journal Int J Mol Sci
Publisher MDPI
Date 2022 Jan 11
PMID 35008598
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Abstract

Background: Ovarian cancer (OC) is one of the most lethal cancers in women. The active form of vitamin D, 1,25-dihydroxyvitamin D (1,25D, calcitriol) has anticancer activity in several cancers, including ovarian cancer, but the required pharmacological doses may cause hypercalcemia. We hypothesized that newly developed, low calcemic, vitamin D analogs (an1,25Ds) may be used as anticancer agents instead of calcitriol in ovarian cancer cells.

Methods: We used two patient-derived high-grade serous ovarian cancer (HGSOC) cell lines with low (13781) and high (14433) mRNA expression levels of the gene encoding 1,25-dihydroxyvitamin D 24-hydroxylase , one of the main target genes of calcitriol. We tested the effect of calcitriol and four structurally related series of an1,25Ds (PRI-1906, PRI-1907, PRI-5201, PRI-5202) on cell number, viability, the expression of , and the vitamin D receptor (VDR).

Results: mRNA expression increased in a concentration-dependent manner after treatment with all compounds. In both cell lines, after 4 h, PRI-5202 was the most potent analog (in 13781 cells: EC = 2.98 ± 1.10 nmol/L, in 14433 cells: EC = 0.92 ± 0.20 nmol/L), while PRI-1907 was the least active one (in 13781 cells: EC = n/d, in 14433 cells: EC = n/d). This difference among the analogs disappeared after 5 days of treatment. The 13781 cells were more sensitive to the an1,25Ds compared with 14433 cells. The an1,25Ds increased nuclear VDR levels and reduced cell viability, but only in the 13781 cell line.

Conclusions: The an1,25Ds had different potencies in the HGSOC cell lines and their efficacy in increasing expression was cell line- and chemical structure-dependent. Therefore, choosing sensitive cancer cell lines and further optimization of the analogs' structure might lead to new treatment options against ovarian cancer.

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