scholarly journals Oroxylin A Reduces Vasoconstriction in Rat Aortic Rings through Promoting NO Production and NOS Protein Expression via Estrogen Receptor Signal Pathway

2020 ◽  
Vol 2020 ◽  
pp. 1-6 ◽  
Author(s):  
Jingtian Qu ◽  
Fang Liu ◽  
Xuezhu Zhang ◽  
Jialong Wang
Keyword(s):  
Estrogen Receptor ◽  
Protein Expression ◽  
Signal Pathway ◽  
No Production ◽  
Oroxylin A ◽  
Ici 182,780 ◽  
Receptor Signal ◽  
Inos Protein Expression ◽  
Underlying Mechanisms

Oroxylin A, a flavonoid, is naturally produced in many medicinal plants. Our previous study identified it as a phytoestrogen. Based on this, the present study investigated its vasoconstriction reducing effects and whether the action was mediated by the estrogen receptor (ER) signal pathway. Long-term in vitro treatment with oroxylin A reduced Ach-induced vasorelaxation and NE-mediated or KCl-mediated contractile responses in rat aortic rings. These effects were interfered by an ER inhibitor ICI 182,780. Rat cardiac microvascular endothelial cells (CMECs) and aortic vascular smooth muscle cells (VSMCs) were used to study the possible underlying mechanisms. Oroxylin A activated the ER signal pathway. In CMECs, it increased NO production and eNOS protein expression. In VSMCs, it promoted NO production and iNOS protein expression. These effects were also inhibited by ICI 182,780. Besides, oroxylin A stimulated ERα and ERβ protein expression in CMECs and VSMCs. All these findings suggest that the ER signal pathway takes part in the vasoconstriction reducing effects of oroxylin A.

scholarly journals Role of MiR-155 Signal Pathway in Regulating Podocyte Injury Induced by TGF-β1

2017 ◽  
Vol 42 (4) ◽  
pp. 1469-1480 ◽  
Author(s):  
Xu Lin ◽  
Xintng Zhen ◽  
Haiting Huang ◽  
Haohao Wu ◽  
Yanwu You ◽  
...  
Keyword(s):  
Protein Expression ◽  
Antisense Oligonucleotides ◽  
Negative Control ◽  
Signal Pathway ◽  
Caspase 9 ◽  
Podocyte Injury ◽  
Apoptosis Rate ◽  
Mrna And Protein Expression ◽  
Tgf Β1

Background/Aims: Transforming growth factor beta 1 (TGF-β1) plays a critical role in the pathogenesis of glomerulosclerosis. The purpose of this study was to examine the effects of inhibition of miR-155 on podocyte injury induced by TGF-β1 and to determine further molecular mediators involved in the effects of miR-155. Methods: Conditionally immortalized podocytes were cultured in vitro and they were divided into four groups: control; TGF-β1 treatment; TGF-β1 with miR-155 knockdown [using antisense oligonucleotides against miR-155 (ASO-miR-155)] and TGF-β1 with negative control antisense oligonucleotides (ASO-NC). Real time RT-PCR and Western blot analysis were employed to determine the mRNA and protein expression of nephrin, desmin and caspase-9, respectively. Flow cytometry was used to examine the apoptotic rate of podocytes and DAPI fluorescent staining was used to determine apoptotic morphology. In addition, we examined the levels of miR-155, TGF-β1, nephrin, desmin and caspase-9 in glomerular tissues of nephropathy induced by intravenous injections of adriamycin in rats. Results: mRNA and protein expression of desmin and caspase-9 was increased in cultured TGF-β1-treated podocytes, whereas nephrin was decreased as compared with the control group. Importantly, miR-155 knockdown significantly attenuated upregulation of desmin and caspase-9, and alleviated impairment of nephrin induced by TGF-β1. Moreover, the number of apoptotic podocytes was increased after exposure to TGF-β1 and this was alleviated after miR-155 knockdown. Knocking down miR-155 also decreased an apoptosis rate of TGF-β1-treated podocytes. Note that negative control antisense oligonucleotides failed to alter an increase of the apoptosis rate in TGF-β1-treated podocytes. Consistent with in vitro results, expression of miR-155, TGF-β1, desmin and caspase-9 was increased and nephrin was decreased in glomerular tissues with nephropathy in vivo experiments. Conclusions: TGF-β1 impairs the protein expression of nephrin and amplifies the protein expression of desmin and caspase -9 via miR-155 signal pathway. Inhibition of miR-155 alleviates these changes in podocytes-treated with TGF-β1 and attenuated apoptosis of podocytes. Our data suggest that miR-155 plays a role in mediating TGF-β1-induced podocyte injury via nephrin, desmin and caspase-9. Results of the current study also indicate that blocking miR-155 signal has a protective effect on podocyte injury. Targeting one or more of these signaling molecules may present new opportunities for treatment and management of podocyte injury observed in glomerulosclerosis.

scholarly journals l-Arginine Availability Regulates Inducible Nitric Oxide Synthase-Dependent Host Defense against Helicobacter pylori

2007 ◽  
Vol 75 (9) ◽  
pp. 4305-4315 ◽  
Author(s):  
Rupesh Chaturvedi ◽  
Mohammad Asim ◽  
Nuruddeen D. Lewis ◽  
Holly M. Scott Algood ◽  
Timothy L. Cover ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Helicobacter Pylori ◽  
Protein Expression ◽  
Translation Initiation Factor ◽  
No Production ◽  
Dependent Manner ◽  
Inos Protein ◽  
Inos Protein Expression ◽  
H Pylori ◽  
Inducible Nitric Oxide

ABSTRACT Helicobacter pylori infection of the stomach causes an active immune response that includes stimulation of inducible nitric oxide (NO) synthase (iNOS) expression. Although NO can kill H. pylori, the bacterium persists indefinitely, suggesting that NO production is inadequate. We determined if the NO derived from iNOS in macrophages was dependent on the availability of its substrate, l-arginine (l-Arg). Production of NO by H. pylori-stimulated RAW 264.7 cells was dependent on the l-Arg concentration in the culture medium, and the 50% effective dose for l-Arg was 220 μM, which is above reported plasma l-Arg levels. While iNOS mRNA induction was l-Arg independent, iNOS protein increased in an l-Arg-dependent manner that did not involve changes in iNOS protein degradation. l-Lysine, an inhibitor of l-Arg uptake, attenuated H. pylori-stimulated iNOS protein expression, translation, NO levels, and killing of H. pylori. While l-Arg starvation suppressed global protein translation, at concentrations of l-Arg at which iNOS protein was only minimally expressed in response to H. pylori, global translation was fully restored and eukaryotic translation initiation factor α was dephosphorylated. H. pylori lacking the gene rocF, which codes for a bacterial arginase, induced higher levels of NO production by increasing iNOS protein levels. When murine gastric macrophages were activated with H. pylori, supraphysiologic levels of l-Arg were required to permit iNOS protein expression and NO production. These findings indicate that l-Arg is rate limiting for iNOS translation and suggest that the levels of l-Arg that occur in vivo do not permit sufficient NO generation by the host to kill H. pylori.

scholarly journals CLE-10 from Carpesium abrotanoides L. Suppresses the Growth of Human Breast Cancer Cells (MDA-MB-231) In Vitro by Inducing Apoptosis and Pro-Death Autophagy Via the PI3K/Akt/mTOR Signaling Pathway

Molecules ◽  
2019 ◽  
Vol 24 (6) ◽  
pp. 1091 ◽  
Author(s):  
Li Tian ◽  
Fan Cheng ◽  
Lei Wang ◽  
Wen Qin ◽  
Kun Zou ◽  
...  
Keyword(s):  
Antitumor Activity ◽  
Protein Expression ◽  
Breast Cancer Cells ◽  
Mtor Signaling Pathway ◽  
Human Breast ◽  
Transmission Electron ◽  
Ic50 Value ◽  
Protein Expressions ◽  
Underlying Mechanisms

Background: The antitumor activity of CLE-10 (4-epi-isoinuviscolide), a sesquiterpene lactone compound, isolated from Carpesium abrotanoides L. has rarely been reported. The aim of this study is to investigate the antitumor activity of CLE-10 and give a greater explanation of its underlying mechanisms. Methods: The cytotoxicity of CLE-10 was evaluated using MTT assay. Autophagy was detected by the formation of mRFP-GFP-LC3 fluorescence puncta and observed using transmission electron microscopy, while flow cytometry was employed to detect apoptosis. The protein expressions were detected through Western blotting. Results: CLE-10 induced pro-death autophagy and apoptosis in MDA-MB-231 cells by increasing the protein expression of LC3-II, p-ULK1, Bax, and Bad, as well as downregulating p-PI3K, p-Akt, p-mTOR, p62, LC3-I, Bcl-2, and Bcl-xl. CLE-10 that was pretreated with 3-methyladenine (3-MA) or chloroquine (CQ) weakened the upregulation of the protein expression of p-ULK1, or the downregulation of p62, p-mTOR, and decreased the level of cytotoxicity against MDA-MB-231 cells. Meanwhile, rapamycin enhanced the effect of CLE-10 on the expression of autophagy-related protein and its cytotoxicity, with the IC50 value of CLE-10 decreasing from 4.07 µM to 2.38 µM. Conclusion: CLE-10 induced pro-death autophagy and apoptosis in MDA-MB-231 cells by upregulating the protein expressions of LC3-II, p-ULK1, Bax, and Bad and downregulating p-PI3K, p-Akt, p-mTOR, p62, Bcl-2, and Bcl-xl.

Differences in in vitro interactions between macrophages with pathogenic and environmental strains of Prototheca

2020 ◽  
Vol 15 (6) ◽  
pp. 427-436
Author(s):  
Jin Yang ◽  
Junhao Zhu ◽  
Timothy Kudinha ◽  
Fanrong Kong ◽  
Qiang-qiang Zhang
Keyword(s):  
Protein Expression ◽  
Rt Pcr ◽  
Inos Protein ◽  
Colony Forming Unit ◽  
Inos Protein Expression ◽  
Cytokine Levels ◽  
Different Strains ◽  
Different Levels ◽  
In Vitro Interactions

Aim: We investigated the interactions between macrophage and different strains of Prototheca. Materials & method: J774A.1 macrophages were infected with clinical isolates of Prototheca ciferrii 18125 and P. ciferrii 50779 and environmental isolate of  P. ciferrii N71. Phagocytosis activities were compared by colony-forming unit assays at 3, 6 and 9 h after infection. Cytokine levels were detected by RT-PCR and ELISA. iNOS protein expression was examined by western blotting. Results: All P. ciferrii strains were phagocytized by macrophages but induced different levels of cytokines in macrophages. Moreover, infected by  P. ciferrii N71 upregulated much higher iNOS protein expression in J774A.1 than that infected by the clinical strains. Conclusion: Clinical and environmental P. ciferrii strains show differences in their interactions with macrophages, which may be attributed to their virulence.

scholarly journals iNOS Associates With Poor Survival in Melanoma: A Role for Nitric Oxide in the PI3K-AKT Pathway Stimulation and PTEN S-Nitrosylation

2021 ◽  
Vol 11 ◽  
Author(s):  
Zhen Ding ◽  
Dai Ogata ◽  
Jason Roszik ◽  
Yong Qin ◽  
Sun-Hee Kim ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Protein Expression ◽  
Nitrosative Stress ◽  
Akt Pathway ◽  
Melanoma Tumor ◽  
Inos Protein ◽  
Akt Activation ◽  
Inos Protein Expression ◽  
Patient Prognosis

We previously showed that inducible nitric oxide synthase (iNOS) protein expression in melanoma tumor cells is associated with poor patient prognosis. Here, we analyzed the association between iNOS and the oncogenic PI3K-AKT pathway. TCGA data show that iNOS and phospho-Akt Ser473 expression were associated significantly only in the subset of tumors with genetically intact PTEN. Employing a stage III melanoma TMA, we showed that iNOS protein presence is significantly associated with shorter survival only in tumors with PTEN protein expression. These findings led to our hypothesis that the iNOS product, nitric oxide (NO), suppresses the function of PTEN and stimulates PI3K-Akt activation. Melanoma cells in response to NO exposure in vitro exhibited enhanced AKT kinase activity and substrate phosphorylation, as well as attenuated PTEN phosphatase activity. Biochemical analysis showed that NO exposure resulted in a post-translationally modified S-Nitrosylation (SNO) PTEN, which was also found in cells expressing iNOS. Our findings provide evidence that NO-rich cancers may exhibit AKT activation due to post-translational inactivation of PTEN. This unique activation of oncogenic pathway under nitrosative stress may contribute to the pathogenesis of iNOS in melanoma. Significance: Our study shows that iNOS expression is associated with increased PI3K-AKT signaling and worse clinical outcomes in melanoma patients with wt (intact) PTEN. Mutated PTEN is already inactivated. We also demonstrate that NO activates the PI3K-AKT pathway by suppressing PTEN suppressor function concurrent with the formation of PTEN-SNO. This discovery provides insight into the consequences of inflammatory NO produced in human melanoma and microenvironmental cells. It suggests that NO–driven modification provides a marker of PTEN inactivation, and represents a plausible mechanism of tumor suppressor inactivation in iNOS expressing subset of cancers.

Abstract 1636: Adverse Effect of Estrogen on Bone Morphogenetic Protein Receptor Signal Pathway in Pulmonary Arterial Endothelial Cells

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Hiroaki Ichimori ◽  
Shigetoyo Kogaki ◽  
Hidekazu Ishida ◽  
Jun Narita ◽  
Toshiki Uchikawa ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Estrogen Receptor ◽  
Bone Morphogenetic Protein ◽  
Signal Pathway ◽  
Bone Morphogenetic Protein Receptor ◽  
Protein Receptor ◽  
Morphogenetic Protein ◽  
Pulmonary Arterial ◽  
Arterial Endothelial Cells

Gender differences in the development of Pulmonary Artery Hypertension (PAH) have been documented in both human and animal studies. In human, idiopathic PAH is predominantly a disease of young women in their child-bearing years, which suggests a role of female sex hormones in the pathogenesis of PAH. However, the effect of sex hormones on pulmonary vasculatures and the development of PAH has not been fully understood. Recent researches have revealed genetic predisposition such as BMPR (Bone Morphogenetic Protein Receptor). The aim of the present study is to investigate the effect of β-estradiol (E2) and oxygen concentration upon BMPR signal pathway in pulmonary arterial endothelial cells (PAEC) in vitro. Human and rat PAEC were cultured and we examined the expression of BMPR2, BMP-regulated Smads, and Id1 under 21% or 1% O 2 with BMP2 stimulation. Then, we investigate changes in the expression of these molecules in the presence of E2 with or without estrogen receptor antagonist (ICI 182.780.). First, we confirmed that estrogen receptor α and β were expressed in both PAECs. Second, we demonstrated that the expression of mRNA transcripts for BMPR2 and Id1 in PAEC was reduced after exposure to 24 hours’ hypoxia. In addition, E2 decreased the expression of phosphorylated Smad (p-Smad)1/5/8 in a dose-dependent manner (10 −10 M-10 −7 M) and p-Smad1/5/8 expression were decreased about 80% by 10 −7 M of E2. These attenuation of p-Smad1/5/8 expression were rescued by ICI182.780. Third, under normoxic condition with cobalt chloride or deferoxamine to prevent the degradation of HIF (hypoxia-inducible factor)-1α, the presence of E2 decreased the expression of p-Smad1/5/8 like under hypoxia. Conversely, administration of HIF-1α inhibitor (YC-1) canceled the reduced expression of p-Smad1/5/8 like under normoxia. Under hypoxia, the presence of E2 attenuates the BMPR signal pathway in PAEC in vitro. Our data indicated that the advance effect of E2 on BMPR signal pathway was associated with HIF-1α and estrogen receptor. Our observations provide the first evidence that female sex hormone affects on BMPR signal pathway, which can offer new strategies for the treatment of PAH.

scholarly journals Elucidation of Underlying Mechanisms by Which Millettia macrophylla Benth Induces Its Estrogenic Activity

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Stéphane Zingue ◽  
Chantal Beatrice Magne Nde ◽  
Colin Clyne ◽  
Dieudonné Njamen
Keyword(s):  
Estrogenic Activity ◽  
Receptor Expression ◽  
Ovariectomized Rats ◽  
Human Embryonic Kidney Cells ◽  
Ici 182,780 ◽  
Beneficial Effects ◽  
Estrogenic Effects ◽  
Underlying Mechanisms

Millettia macrophylla is used traditionally to treat menopause related symptoms. This plant was shown to exhibit estrogenic effects in vitro on human embryonic kidney cells and in vivo on ovariectomized rats. The present study aimed at elucidating underlying mechanisms by which M. macrophylla induced its estrogenic effects. To accomplish our goal, kidney Hek293T cells transiently transfected with estrogen alpha or beta receptor expression plasmids were cotreated with a pure antiestrogen ICI 182,780 and the dichloromethane or methanol soluble fractions of M. macrophylla. To follow up, we cotreated ovariectomized rats with both extracts and ICI 182,780 for 3 days in the classical uterotrophic assay. Animals were then sacrificed and the uterine wet weight, total protein levels in uteri, uterine, and vaginal epithelial heights, and mammary gland were assessed. In vitro, the results suggested that the induction of the estrogenic activity by M. macrophylla is due to the binding of its secondary metabolites to ERα and ERβ. In vivo, the cotreatment of extracts and ICI 182,780 significantly abrogated the biological responses induced by the extracts alone. Taken together, these results indicate that the active principles of M. macrophylla induce their beneficial effects on menopausal symptoms by activating the ERs.

scholarly journals Astragaloside IV Promotes Adult Neurogenesis in Hippocampal Dentate Gyrus of Mouse through CXCL1/CXCR2 Signaling

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2178 ◽  
Author(s):  
Fei Huang ◽  
Yunyi Lan ◽  
Liyue Qin ◽  
Huaihuai Dong ◽  
Hailian Shi ◽  
...  
Keyword(s):  
Protein Expression ◽  
Dentate Gyrus ◽  
Adult Neurogenesis ◽  
Astragaloside Iv ◽  
Hippocampal Dentate Gyrus ◽  
Promotive Effect ◽  
Mature Neurons ◽  
Underlying Mechanisms ◽  
Proliferation In Vitro

Astragaloside IV (ASI) has been reported to promote neural stem cells proliferation in vitro and CXCR2 expression on neutrophils. The present study was aimed to investigate the influence of ASI on adult neurogenesis in hippocampal dentate gyrus (DGs) of mouse and to discuss the possible underlying mechanisms. Total number of proliferative cells (BrdU+), pre-mature neurons (DCX+), early proliferative cells (BrdU+/DCX+), proliferative radial gila-like cells (BrdU+/GFAP+) and newly generated neurons (BrdU+/NeuN+) after ASI or vehicle administration for two weeks were counted, respectively. The results showed that BrdU+ cells and DCX+ cells were significantly increased in DGs of mice administered with ASI. The numbers of BrdU+/DCX+, BrdU+/GFAP+ cells and BrdU+/NeuN+ cells were also elevated in the ASI group. Correspondingly, ASI increased the protein expression of hippocampal DCX, GFAP and NeuN. Further study disclosed that ASI remarkably up-regulated the mRNA and protein expressions of CXCL1 as well as that of CXCR2 in the hippocampus. The promotive effect of ASI on DCX, GFAP and NeuN protein expression was abolished by SB225002, the inhibitor of CXCR2. Our results indicated that ASI modulated the homeostasis of the CXCL1/CXCR2 signaling pathway, which might be responsible for the increased neurogenesis within the hippocampal DGs of mice.

scholarly journals Withaninsams A and B: Phenylpropanoid Esters from the Roots of Indian Ginseng (Withania somnifera)

Plants ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 527 ◽  
Author(s):  
Su Cheol Baek ◽  
Seoyoung Lee ◽  
Sil Kim ◽  
Mun Seok Jo ◽  
Jae Sik Yu ◽  
...  
Keyword(s):  
Protein Expression ◽  
Withania Somnifera ◽  
No Production ◽  
Ionization Mass ◽  
Inos Protein ◽  
Bioactive Natural Products ◽  
Indian Ginseng ◽  
Ionization Mass Spectroscopy ◽  
Inos Protein Expression ◽  
Anti Inflammatory

Withania somnifera (L.) Dunal (Solanaceae), known as Indian ginseng or ashwagandha, has been used in Indian Ayurveda for the treatment of a variety of disorders, such as diabetes and reproductive and nervous system disorders. It is particularly used as a general health tonic, analgesic, and sedative. As part of continuing projects to discover unique bioactive natural products from medicinal plants, phytochemical investigation of the roots of W. somnifera combined with a liquid chromatography–mass spectrometry (LC/MS)-based analysis has led to the isolation of two novel phenylpropanoid esters, Withaninsams A (1) and B (2), as an inseparable mixture, along with three known phenolic compounds (3, 4, and 6) and a pyrazole alkaloid (5). The structures of the new compounds were elucidated using a combination of spectroscopic methods, including one-dimensional (1D) and two-dimensional (2D) nuclear magnetic resonance (NMR) and high-resolution electrospray ionization mass spectroscopy (HR-ESIMS). Withaninsams A (1) and B (2) are phenylpropanoid esters that contain a side chain, 4-methyl-1,4-pentanediol unit. To the best of our knowledge, the present study is the first to report on phenylpropanoid esters with 4-methyl-1,4-pentanediol unit. The anti-inflammatory activity of the isolated compounds (1–6) was evaluated by determining their inhibitory effects on nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophages, where compound 3 inhibited LPS-induced NO production (IC50 = 33.3 μM) and TNF-α production, a pro-inflammatory cytokine (IC50 = 40.9 μM). The anti-inflammatory mechanism through the inhibition of transcriptional iNOS protein expression was confirmed by western blotting experiments for the active compound 3, which showed decreased iNOS protein expression.

scholarly journals Effects of Monoglycerides on Rhodamine 123 Accumulation, Estradiol 17 β-D-Glucuronide Bidirectional Transport and MRP2 Protein Expression within Caco-2 cells

2008 ◽  
Vol 11 (3) ◽  
pp. 45 ◽  
Author(s):  
Jessica X. Jia ◽  
Kishor M Wasan
Keyword(s):  
Protein Expression ◽  
Positive Control ◽  
Drug Uptake ◽  
Rhodamine 123 ◽  
Oral Drug ◽  
Efflux Transporters ◽  
Bidirectional Transport ◽  
Underlying Mechanisms ◽  
Lipid Excipients

Purpose. Oral drug development had been hindered by the bioavailability issue despite vast market popularity. Lipid excipients had shown to enhance bioavailability of a number of reformulated hydrophobic oral drugs, yet the underlying mechanisms of action by lipids are still unclear. One proposed mechanism is that lipid excipients could facilitate drug uptake by altering the activities of apical membrane intestinal efflux transporters. Thus, this study aimed to investigate the effects of 1-monopalmitin, 1-monoolein and 1-monostearin on the efflux activity and protein expression of multidrug resistance-associated protein 2 (MRP2) in vitro. Methods. The 24-hour non-cytotoxic ranges of these monoglycerides were first determined using MTS and LDH assays in Caco-2 cells. Then, both accumulation and bidirectional transport studies were conducted using 10 uM rhodamine 123 (Rh123) and 10 nM estradiol 17 β-D-glucuronide (E217βG), respectively, to assess the functional activities of MRP2. 50 µM MK-571, a specific MRP1 and MRP2 inhibitor, was used as the positive control in both studies. Western blotting was followed to determine the effect of these monoglycerides on MRP2 protein expression. Results. Caco-2 cells were viable when treated with 1-monopalmitin, 1-monostearin and 1-monoolein at concentrations equal or less than 1000 µM, 1000 µM and 500 µM, respectively. Cells treated with 1-monoplamitin, 1-monostearin, 1-monoolein and MK571 resulted in significant increases in Rh123 accumulation and decreases in E217βG efflux ratio compared to the control (medium treated only). MRP2 protein expressions in 1-monopalmitin and 1-monoolein treated cells were decreased by 19% and 35% compared to the control; however, there was no change of MRP2 protein expression in 1-monostearin treated cells. Conclusions. These findings suggested that 1-monoolein, 1-monostearin and 1-monopalmitin could attenuate the activity of MRP2 and possibly other efflux transporters in Caco-2 cells. The reduction of efflux activity of MRP2 by 1-monoolein treatment could be partially accounted by the non-specific down-regulation of MRP2 protein expression.

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