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• W2320955057 abstract "CYP2J3 in myocardium metabolizes arachidonic acid to 4 regioisomeric epoxyeicosatrienoic acids (EETs), which have diverse biological activities in rat heart. In this study we examined whether CYP2J3 was involved in cardioprotective effects of ophiopogonin D (OPD), a steroidal glycoside isolated from Chinese herb Radix ophiopogonis.Rat cardiomyoblast cell line (H9c2 cells) was tested. Intracellular Ca(2+) concentrations ([Ca(2+)]i) were measured using Fluo-4/AM. The expression of calcium-regulating molecules and ER stress signaling molecules was measured with qRT-PCR and Western blot analyses. Cell apoptosis was quantified with Hoechst 33258 staining and TUNEL assay. The level of 14,15-DHET, a stable metabolite of 14,15-EET, was assessed with ELISA.Angiotensin II (10(-6) mol/L) significantly decreased the expression of calcium-regulating molecules (SERCA2a, PLB, RyR2 and FKBP12.6), and elevated [Ca(2+)]i in H9c2 cells. Furthermore, angiotensin II markedly increased the expression of ER stress signaling molecules (GRP78, CHOP, p-JNK and cleaved caspase-12) and ER stress-mediated apoptosis. OPD (100, 250 and 500 nmol/L) dose-dependently increased CYP2J3 expression and 14,15-DHET levels in normal H9c2 cells. Pretreatment of H9c2 cells with OPD suppressed angiotensin II-induced abnormalities in Ca(2+) homeostasis, ER stress responses and apoptosis. Overexpression of CYP2J3 or addition of exogenous 14,15-EET also prevented angiotensin II-induced abnormalities in Ca(2+) homeostasis, whereas transfection with CYP2J3 siRNA diminished the effects of OPD on Ca(2+) homeostasis. Furthermore, the intracellular Ca(2+) chelator BAPTA suppressed angiotensin II-induced ER stress responses and apoptosis in H9c2 cells.OPD is a novel CYP2J3 inducer that may offer a therapeutic benefit in treatment of cardiovascular diseases related to disturbance of Ca(2+) homeostasis and ER stress." @default.
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• W2320955057 date "2016-02-01" @default.
• W2320955057 modified "2023-10-05" @default.
• W2320955057 title "Ophiopogonin D maintains Ca2+ homeostasis in rat cardiomyocytes in vitro by upregulating CYP2J3/EETs and suppressing ER stress" @default.
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• W2320955057 doi "https://doi.org/10.1038/aps.2015.146" @default.
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