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• W3006450065 abstract "Recent studies indicated that intramammary administration of active vitamin D3 hormone (1,25D3) inhibits the inflammatory process associated with mastitis. We hypothesized that attenuation of endoplasmic reticulum (ER) stress by 1,25D3 in mammary epithelial cells (MECs) is an important cellular mechanism contributing to this beneficial effect of intramammary treatment with 1,25D3. To test this hypothesis, the effect of 1,25D3 was studied on induction of ER stress in a transformed human MEC line, MCF-7 cells. Treatment with two different ER stress inducers, thapsigargin (TG) and tunicamycin (TM), caused a dose-dependent induction of ER stress as evident from up-regulation of protein kinase RNA-like ER kinase (PERK), heat shock protein family A (Hsp70) member 5 (HSPA5), activating transcription factor (ATF4), ATF6, DNA damage inducible transcript 3 (DDIT3) and spliced X-box binding protein 1 (sXBP1) and impaired cell viability and decreased expression of vitamin D receptor (VDR) in MCF-7 cells (P < 0.05). Treatment with 1,25D3 (100 nM) inhibited TG (10 nM)- and TM (1 μg/mL)-induced mRNA and/or protein levels of ATF4, ATF6, DDIT3 and HSPA5 in MCF-7 cells (P < 0.05). In addition, 1,25D3 (100 nM) antagonized the effect of TG (10 nM) and TM (1 μg/mL) on mRNA and protein levels of VDR and mRNA levels of genes involved in production and degradation of 1,25D3 in MCF-7 cells (P < 0.05). Moreover, 1,25D3 (100 nM) inhibited nuclear factor-κB (NF-κB) activation in response to TM (10 nM) and TG (1 μg/mL) in MCF-7 cells. In conclusion, the present findings show that 1,25D3 is effective in attenuating ER stress and the NF-κB-driven inflammatory response in MCF-7 cells. This indicates that attenuation of ER stress by 1,25D3 in MECs may contribute to the recently observed inhibitory effect of intramammary treatment of dairy cows with 1,25D3 on the inflammatory process associated with mastitis." @default.
• W3006450065 created "2020-02-24" @default.
• W3006450065 creator A5030594645 @default.
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• W3006450065 date "2020-02-10" @default.
• W3006450065 modified "2023-10-11" @default.
• W3006450065 title "1,25-hydroxyvitamin D3 decreases endoplasmic reticulum stress-induced inflammatory response in mammary epithelial cells" @default.
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• W3006450065 doi "https://doi.org/10.1371/journal.pone.0228945" @default.
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