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Danek PJ, Daniel WA. The effect of new atypical antipsychotic drugs on the expression of transcription factors regulating cytochrome P450 enzymes in rat liver. Pharmacol Rep 2024; 76:895-901. [PMID: 38878234 PMCID: PMC11294401 DOI: 10.1007/s43440-024-00608-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 05/29/2024] [Accepted: 05/30/2024] [Indexed: 08/02/2024]
Abstract
BACKGROUND Our recent studies showed that prolonged administration of novel atypical antipsychotics affected the expression and activity of cytochrome P450 (CYP), as demonstrated in vitro on human hepatocytes and in vivo on the rat liver. The aim of the present work was to study the effect of repeated treatment with asenapine, iloperidone, and lurasidone on the expression of transcription factors regulating CYP drug-metabolizing enzymes in rat liver. METHODS The hepatic mRNA (qRT-PCR) and protein levels (Western blotting) of aryl hydrocarbon receptor (AhR), pregnane X receptor (PXR), constitutive androstane receptor (CAR) and peroxisome proliferator-activated receptor (PPARγ) were measured in male Wistar rats after 2 week-treatment with asenapine, iloperidone or lurasidone. RESULTS The 2-week treatment with asenapine significantly diminished the AhR and PXR expression (mRNA, protein level), and CAR mRNA level in rat liver. Iloperidone lowered the AhR and CAR expression and PXR protein level. Lurasidone did not affect the expression of AhR and CAR, but increased PXR expression. The antipsychotics did not affect PPARγ. CONCLUSIONS Prolonged treatment with asenapine, iloperidone, or lurasidone affects the expression of transcription factors regulating the CYP drug-metabolizing enzymes. The changes in the expression of AhR, CAR, and PXR mostly correlate with alterations in the expression and activity of respective CYP enzymes found in our previous studies. Since these transcription factors are also engaged in the expression of phase II drug metabolism and drug transporters, changes in their expression may affect the metabolism of endogenous substrates and pharmacokinetics of concomitantly used drugs.
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Affiliation(s)
- Przemysław J Danek
- Department of Pharmacokinetics and Drug Metabolism, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343, Kraków, Poland
| | - Władysława A Daniel
- Department of Pharmacokinetics and Drug Metabolism, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343, Kraków, Poland.
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Lei S, Lu J, Cheng A, Hussain Z, Tidgewell K, Zhu J, Ma X. Identification of PXR Activators from Uncaria Rhynchophylla (Gou Teng) and Uncaria Tomentosa (Cat's Claw). Drug Metab Dispos 2023; 51:629-636. [PMID: 36797057 PMCID: PMC10158501 DOI: 10.1124/dmd.122.001234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 02/09/2023] [Accepted: 02/10/2023] [Indexed: 02/18/2023] Open
Abstract
Uncaria rhynchophylla (Gou Teng) and Uncaria tomentosa (cat's claw) are frequently used herbal supplements in Asia and America, respectively. Despite their common usage, information is limited regarding potential herb-drug interactions associated with Gou Teng and cat's claw. The pregnane X receptor (PXR) is a ligand-dependent transcription factor that regulates cytochrome P450 3A4 (CYP3A4) expression and contributes to some known herb-drug interactions. A recent study found that Gou Teng induces CYP3A4 expression, but its mechanism is unknown. Cat's claw has been determined as a PXR-activating herb, but the PXR activators in cat's claw have not been identified. Using a genetically engineered PXR cell line, we found that the extracts of Gou Teng and cat's claw can dose-dependently activate PXR and induce CYP3A4 expression. We next used a metabolomic approach to profile the chemical components in the extracts of Gou Teng and cat's claw followed by screening for PXR activators. Four compounds, isocorynoxeine, rhynchophylline, isorhynchophylline, and corynoxeine, were identified as PXR activators from both Gou Teng and cat's claw extracts. In addition, three more PXR activators were identified from the extracts of cat's claw, including isopteropodine, pteropodine, and mitraphylline. All seven of these compounds showed the half-maximal effective concentration <10 µM for PXR activation. In summary, our work determined Gou Teng as a PXR-activating herb and discovered novel PXR activators from Gou Teng as well as cat's claw. SIGNIFICANCE STATEMENT: This study's data can be used to guide the safe use of Gou Teng and cat's claw by avoiding PXR-mediated herb-drug interactions.
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Affiliation(s)
- Saifei Lei
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania (S.L., J.L., A.C., Z.H., J.Z., X.M.) and Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (K.T.)
| | - Jie Lu
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania (S.L., J.L., A.C., Z.H., J.Z., X.M.) and Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (K.T.)
| | - Anqi Cheng
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania (S.L., J.L., A.C., Z.H., J.Z., X.M.) and Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (K.T.)
| | - Zahir Hussain
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania (S.L., J.L., A.C., Z.H., J.Z., X.M.) and Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (K.T.)
| | - Kevin Tidgewell
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania (S.L., J.L., A.C., Z.H., J.Z., X.M.) and Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (K.T.)
| | - Junjie Zhu
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania (S.L., J.L., A.C., Z.H., J.Z., X.M.) and Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (K.T.)
| | - Xiaochao Ma
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania (S.L., J.L., A.C., Z.H., J.Z., X.M.) and Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (K.T.)
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Pan S, Guo Y, Yu W, Zhang J, Qiao X, Li L, Xu P, Zhai Y. Constitutive Androstane Receptor Agonist, TCPOBOP: Maternal Exposure Impairs the Growth and Development of Female Offspring in Mice. Int J Mol Sci 2023; 24:ijms24032602. [PMID: 36768963 PMCID: PMC9917268 DOI: 10.3390/ijms24032602] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/24/2023] [Accepted: 01/25/2023] [Indexed: 01/31/2023] Open
Abstract
Environmental chemicals, which are known to impact offspring health, have become a public concern. Constitutive activated receptor (CAR) is activated by various environmental chemicals and participates in xenobiotic metabolism. Here, we described the effects of maternal exposure to the CAR-specific ligand 1,4-bis[2-(3,5-dichloropyridyloxy)] benzene (TCPOBOP, TC) on offspring health outcomes. Maternal TC exposure exhibited a stronger inhibition of body weight in 3-week-old and 8-week-old first-generation (F1) offspring female mice compared to controls. Further, maternal TC exposure obtained a strong increase in hepatic drug-metabolizing enzyme expression in 3-week-old female mice that persisted into 8-week-old adulthood. Interestingly, we observed distorted intestinal morphological features in 8-week-old F1 female mice in the TC-exposed group. Moreover, maternal TC exposure triggered a loss of intestinal barrier integrity by reducing the expression of intestinal tight junction proteins. Accordingly, maternal exposure to TC down-regulated serum triglyceride levels as well as decreased the expression of intestinal lipid uptake and transport marker genes. Mechanistically, maternal TC exposure activated the intestinal inflammatory response and disrupted the antioxidant system in the offspring female mice, thereby impeding the intestinal absorption of nutrients and seriously threatening offspring health. Altogether, these findings highlight that the effects of maternal TC exposure on offspring toxicity could not be ignored.
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Affiliation(s)
- Shijia Pan
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
- Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Yuan Guo
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
- Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Wen Yu
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
- Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Jia Zhang
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
- Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Xiaoxiao Qiao
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
- Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Letong Li
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
- Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Pengfei Xu
- School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
- Center for Pharmacogenetics and Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA 15261, USA
- Correspondence: (P.X.); (Y.Z.)
| | - Yonggong Zhai
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
- Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China
- Correspondence: (P.X.); (Y.Z.)
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Pan S, Guo Y, Yu W, Hong F, Qiao X, Zhang J, Xu P, Zhai Y. Environmental chemical TCPOBOP disrupts milk lipid homeostasis during pregnancy and lactation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 249:114463. [PMID: 38321682 DOI: 10.1016/j.ecoenv.2022.114463] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 12/12/2022] [Accepted: 12/21/2022] [Indexed: 02/08/2024]
Abstract
Humans are exposed to different kinds of environmental contaminants or drugs throughout their lifetimes. The widespread presence of these compounds has raised concerns about the consequent adverse effects on lactating women. The constitutive androstane receptor (CAR, Nr1i3) is known as a xenobiotic sensor for environmental pollution or drugs. In this study, the model environmental chemical 1, 4-bis [2-(3, 5-dichloropyridyloxy)] benzene, TCPOBOP (TC), which is a highly specific agonist of CAR, was used to investigate the effects of exogenous exposure on lactation function and offspring health in mice. The results revealed that TC exposure decreased the proliferation of mammary epithelial cells during pregnancy. This deficiency further compromised lobular-alveolar structures, resulting in alveolar cell apoptosis, as well as premature stoppage of the lactation cycle and aberrant lactation. Furthermore, TC exposure significantly altered the size and number of milk lipid droplets, suggesting that TC exposure inhibits milk lipid synthesis. Additionally, TC exposure interfered with the milk lipid metabolism network, resulting in the inability of TC-exposed mice to efficiently secrete nutrients and feed their offspring. These findings demonstrated that restricted synthesis and secretion of milk lipids would indirectly block mammary gland form and function, which explained the possible reasons for lactation failure and retarded offspring growth.
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Affiliation(s)
- Shijia Pan
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China; Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China.
| | - Yuan Guo
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China; Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China.
| | - Wen Yu
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China; Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China.
| | - Fan Hong
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China; Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China.
| | - Xiaoxiao Qiao
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China; Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China.
| | - Jia Zhang
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China; Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China.
| | - Pengfei Xu
- School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China; Center for Pharmacogenetics and Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA 15261, USA.
| | - Yonggong Zhai
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China; Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing 100875, China.
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Bone C, Squires EJ. Nuclear Receptor Pathways Mediating the Development of Boar Taint. Metabolites 2022; 12:metabo12090785. [PMID: 36144190 PMCID: PMC9503508 DOI: 10.3390/metabo12090785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 08/17/2022] [Accepted: 08/24/2022] [Indexed: 11/29/2022] Open
Abstract
The nuclear receptors PXR, CAR, and FXR are activated by various ligands and function as transcription factors to control the expression of genes that regulate the synthesis and metabolism of androstenone and skatole. These compounds are produced in entire male pigs and accumulate in the fat to cause the development of a meat quality issue known as boar taint. The extent of this accumulation is influenced by the synthesis and hepatic clearance of androstenone and skatole. For this reason, PXR, CAR, and FXR-mediated signaling pathways have garnered interest as potential targets for specialized treatments designed to reduce the development of boar taint. Recent research has also identified several metabolites produced by gut microbes that act as ligands for these nuclear receptors (e.g., tryptophan metabolites, short-chain fatty acids, bile acids); however, the connection between the gut microbiome and boar taint development is not clear. In this review, we describe the nuclear receptor signaling pathways that regulate the synthesis and metabolism of boar taint compounds and outline the genes involved. We also discuss several microbial-derived metabolites and dietary additives that are known or suspected nuclear receptor ligands and suggest how these compounds could be used to develop novel treatments for boar taint.
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Dutta M, Lim JJ, Cui JY. Pregnane X Receptor and the Gut-Liver Axis: A Recent Update. Drug Metab Dispos 2022; 50:478-491. [PMID: 34862253 PMCID: PMC11022899 DOI: 10.1124/dmd.121.000415] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 12/02/2021] [Indexed: 02/04/2023] Open
Abstract
It is well-known that the pregnane X receptor (PXR)/Nr1i2 is a critical xenobiotic-sensing nuclear receptor enriched in liver and intestine and is responsible for drug-drug interactions, due to its versatile ligand binding domain (LBD) and target genes involved in xenobiotic biotransformation. PXR can be modulated by various xenobiotics including pharmaceuticals, nutraceuticals, dietary factors, and environmental chemicals. Microbial metabolites such as certain secondary bile acids (BAs) and the tryptophan metabolite indole-3-propionic acid (IPA) are endogenous PXR activators. Gut microbiome is increasingly recognized as an important regulator for host xenobiotic biotransformation and intermediary metabolism. PXR regulates and is regulated by the gut-liver axis. This review summarizes recent research advancements leveraging pharmaco- and toxico-metagenomic approaches that have redefined the previous understanding of PXR. Key topics covered in this review include: (1) genome-wide investigations on novel PXR-target genes, novel PXR-DNA interaction patterns, and novel PXR-targeted intestinal bacteria; (2) key PXR-modulating activators and suppressors of exogenous and endogenous sources; (3) novel bidirectional interactions between PXR and gut microbiome under physiologic, pathophysiological, pharmacological, and toxicological conditions; and (4) modifying factors of PXR-signaling including species and sex differences and time (age, critical windows of exposure, and circadian rhythm). The review also discusses critical knowledge gaps and important future research topics centering around PXR. SIGNIFICANCE STATEMENT: This review summarizes recent research advancements leveraging O'mics approaches that have redefined the previous understanding of the xenobiotic-sensing nuclear receptor pregnane X receptor (PXR). Key topics include: (1) genome-wide investigations on novel PXR-targeted host genes and intestinal bacteria as well as novel PXR-DNA interaction patterns; (2) key PXR modulators including microbial metabolites under physiological, pathophysiological, pharmacological, and toxicological conditions; and (3) modifying factors including species, sex, and time.
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Affiliation(s)
- Moumita Dutta
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington
| | - Joe Jongpyo Lim
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington
| | - Julia Yue Cui
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington
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Daniel WA, Bromek E, Danek PJ, Haduch A. The mechanisms of interactions of psychotropic drugs with liver and brain cytochrome P450 and their significance for drug effect and drug-drug interactions. Biochem Pharmacol 2022; 199:115006. [PMID: 35314167 DOI: 10.1016/j.bcp.2022.115006] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/11/2022] [Accepted: 03/14/2022] [Indexed: 02/08/2023]
Abstract
Cytochrome P450 (CYP) plays an important role in psychopharmacology. While liver CYP enzymes are responsible for the biotransformation of psychotropic drugs, brain CYP enzymes are involved in the local metabolism of these drugs and endogenous neuroactive substances, such as neurosteroids, and in alternative pathways of neurotransmitter biosynthesis including dopamine and serotonin. Recent studies have revealed a relation between the brain nervous system and cytochrome P450, indicating that CYP enzymes metabolize endogenous neuroactive substances in the brain, while the brain nervous system is engaged in the central neuroendocrine and neuroimmune regulation of cytochrome P450 in the liver. Therefore, the effect of neuroactive drugs on cytochrome P450 should be investigated not only in vitro, but also at in vivo conditions, since only in vivo all mechanisms of drug-enzyme interaction can be observed, including neuroendocrine and neuroimmune modulation. Psychotropic drugs can potentially affect cytochrome P450 via a number of mechanisms operating at the level of the nervous, hormonal and immune systems, and the liver. Their effect on cytochrome P450 in the brain is often different than in the liver and region-dependent. Since psychotropic drugs can affect cytochrome P450 both in the liver and brain, they can modify their own pharmacological effect at both pharmacokinetic and pharmacodynamic level. The article describes the mechanisms by which psychotropic drugs can change the expression/activity of cytochrome P450 in the liver and brain, and discusses the significance of those mechanisms for drug action and drug-drug interactions. Moreover, the brain CYP2D6 is considered as a potential target for psychotropics.
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Affiliation(s)
- Władysława A Daniel
- Department of Pharmacokinetics and Drug Metabolism, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343 Kraków, Poland.
| | - Ewa Bromek
- Department of Pharmacokinetics and Drug Metabolism, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343 Kraków, Poland
| | - Przemysław J Danek
- Department of Pharmacokinetics and Drug Metabolism, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343 Kraków, Poland
| | - Anna Haduch
- Department of Pharmacokinetics and Drug Metabolism, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343 Kraków, Poland
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Shin A, Waxman DJ. Impact of neonatal activation of nuclear receptor CAR (Nr1i3) on Cyp2 gene expression in adult mouse liver. Toxicol Sci 2022; 187:298-310. [PMID: 35285501 DOI: 10.1093/toxsci/kfac032] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Perinatal exposure to environmental chemicals is proposed to reprogram development and alter disease susceptibility later in life. Supporting this, neonatal activation of the nuclear receptor CAR (Nr1i3) by TCPOBOP induces persistent expression of mouse hepatic Cyp2 genes into adulthood, attributed to long-term epigenetic memory of the early life exposure [Hepatology (2012) 56:1499-1509]. Here, we confirm that the same high-dose (15x ED50) neonatal TCPOBOP exposure used in that work induces prolonged (12 weeks) increases in hepatic Cyp2 expression; however, we show that the persistence of expression can be fully explained by the persistence of residual TCPOBOP in liver tissue. When the long-term presence of TCPOBOP in tissue was eliminated by decreasing the neonatal TCPOBOP dose 22-fold (0.67x ED50), strong neonatal increases in hepatic Cyp2 expression were still obtained but did not persist into adulthood. Furthermore, the neonatal ED50-range TCPOBOP exposure did not sensitize mice to a subsequent, low-dose TCPOBOP treatment. In contrast, neonatal treatment with phenobarbital, a short half-life (t1/2=8 h) agonist of CAR and of PXR (Nr1i2), induced high-level neonatal activation of Cyp2 genes and also altered their responsiveness to low-dose phenobarbital exposure at adulthood by either increasing (Cyp2b10) or decreasing (Cyp2c55) expression. Thus, neonatal xenobiotic exposure can reprogram hepatic Cyp2 genes and alter their responsiveness to exposures later in life. These findings highlight the need to carefully consider xenobiotic dose, half-life and persistence in tissue when evaluating the long-term effects of early life environmental chemical exposures.
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Affiliation(s)
- Aram Shin
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts 02215, USA
| | - David J Waxman
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts 02215, USA
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Nakano M, Nakajima M. A-to-I RNA editing and m6A modification modulating expression of drug-metabolizing enzymes. Drug Metab Dispos 2022; 50:624-633. [DOI: 10.1124/dmd.121.000390] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 02/02/2022] [Indexed: 11/22/2022] Open
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Zhang J, Pavek P, Kamaraj R, Ren L, Zhang T. Dietary phytochemicals as modulators of human pregnane X receptor. Crit Rev Food Sci Nutr 2021:1-23. [PMID: 34698593 DOI: 10.1080/10408398.2021.1995322] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
As a promiscuous xenobiotic sensor, pregnane X receptor (PXR) plays a crucial role in drug metabolism. Since dietary phytochemicals exhibit the potential to modulate human PXR, this review aims to summarize the plant-derived PXR modulators, including agonists, partial agonists, and antagonists. The crystal structures of the apo and ligand-bound forms of PXR especially that of PXR complexed with binary mixtures are summarized, in order to provide the structural basis for PXR binding promiscuity and synergistic activation of PXR by composite ligands. Furthermore, this review summarizes the characterized agonists, partial agonists, and antagonists of human PXR from botanical source. Contrary to PXR agonists, there are only a few antagonists obtained from botanical source due to the promiscuity of PXR. It is worth noting that trans-resveratrol and a series of methylindoles have been identified as partial agonists of PXR, both in activating PXR function, but also inhibiting the effect of other PXR agonists. Since antagonizing PXR function plays a crucial role in the prevention of drug-drug interactions and improvement of therapeutic efficacy, further research is necessary to screen more plant-derived PXR antagonists in the future. In summary, this review may contribute to understanding the roles of phytochemicals in food-drug and herb-drug interactions.
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Affiliation(s)
- Jie Zhang
- College of Food Science and Engineering, Jilin University, Changchun, China
| | - Petr Pavek
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Charles University, Hradec Kralove, Czech Republic
| | - Rajamanikkam Kamaraj
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Charles University, Hradec Kralove, Czech Republic
| | - Li Ren
- College of Food Science and Engineering, Jilin University, Changchun, China
| | - Tiehua Zhang
- College of Food Science and Engineering, Jilin University, Changchun, China
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Chen Y, Tang Y, Nie JZ, Zhang Y, Nie D. Megestrol acetate is a specific inducer of CYP3A4 mediated by human pregnane X receptor. Cancer Chemother Pharmacol 2021; 88:985-996. [PMID: 34524495 DOI: 10.1007/s00280-021-04352-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 09/01/2021] [Indexed: 11/28/2022]
Abstract
PURPOSE Megestrol acetate is a synthetic progestogen used to treat some cancers and cancer-associated cachexia, but its potential interactions with other drugs are not well known. This study aims to determine the regulation of drug metabolizing enzymes by megestrol acetate. METHODS Primary human hepatocytes were treated and analyzed by PCR array to identify genes involved in drug metabolism that are impacted by megestrol acetate. P450 3A4 (CYP3A4) reporter gene assay and HPLC analyses of nifedipine metabolites were used to determine CYP3A4 gene expression and activities. Competitive ligand binding assay was used to determine the affinity of megestrol acetate toward human pregnane x receptor (hPXR). Electrophoretic mobility shift assay and mammalian two hybrid assay were used to determine the mechanism of megestrol to activate hPXR. RESULTS The levels and activities of CYP3A4 were significantly induced (> 4-folds) by megestrol acetate in human hepatocytes and HepG2 cells. Megestrol treatment induced CYP3A4 through the activation of hPXR, a ligand-activated transcription factor that plays a role in drug metabolism and transport. Other tested nuclear receptors showed no response. The mechanism studies showed that megestrol activated hPXR by binding to the ligand binding domain (LBD) of hPXR and increasing the recruitment of the cofactors such as steroid receptor cofactor (SRC-1). CONCLUSION The results suggest that megestrol acetate is a specific inducer of CYP3A4 mediated by hPXR and therefore has the potential to cause drug interactions, especially in the co-administration with drugs that are substrates of CYP3A4.
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Affiliation(s)
- Yakun Chen
- Department of Medical Microbiology, Immunology and Cell Biology, Southern Illinois University School of Medicine and Simmons Cancer Institute, Springfield, IL, 62794-9626, USA
| | - Yong Tang
- Department of Medical Microbiology, Immunology and Cell Biology, Southern Illinois University School of Medicine and Simmons Cancer Institute, Springfield, IL, 62794-9626, USA
| | - Jeffrey Z Nie
- Department of Medical Microbiology, Immunology and Cell Biology, Southern Illinois University School of Medicine and Simmons Cancer Institute, Springfield, IL, 62794-9626, USA
| | - Yuanqin Zhang
- Department of Medical Microbiology, Immunology and Cell Biology, Southern Illinois University School of Medicine and Simmons Cancer Institute, Springfield, IL, 62794-9626, USA
| | - Daotai Nie
- Department of Medical Microbiology, Immunology and Cell Biology, Southern Illinois University School of Medicine and Simmons Cancer Institute, Springfield, IL, 62794-9626, USA.
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12
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Shehu AI, Zhu J, Li J, Lu J, McMahon D, Xie W, Gonzalez FJ, Ma X. Targeting Xenobiotic Nuclear Receptors PXR and CAR to Prevent Cobicistat Hepatotoxicity. Toxicol Sci 2021; 181:58-67. [PMID: 33629115 DOI: 10.1093/toxsci/kfab023] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Liver-related diseases including drug-induced liver injury are becoming increasingly prominent in AIDS patients. Cobicistat (COBI) is the backbone of multiple regimens for antiretroviral therapy. The current work investigated the mechanisms of adverse drug-drug interactions associated with COBI that lead to liver damage. For individuals co-infected with HIV and tuberculosis (TB), the World Health Organization recommends the initiation of TB treatment followed by antiretroviral therapy. Rifampicin (RIF), a first line anti-TB drug, is a human specific activator of pregnane X receptor (PXR). Using PXR-humanized mice, we found that RIF-mediated PXR activation potentiates COBI hepatotoxicity. In contrast, rifabutin, a PXR-neutral analog of RIF, has no impact on COBI hepatotoxicity. Because of the crosstalk between PXR and the constitutive androstane receptor (CAR), the role of CAR in COBI hepatotoxicity was also investigated. Similar to PXR, ligand-dependent activation of CAR also potentiates COBI hepatotoxicity. Our further studies illustrated that PXR and CAR modulate COBI hepatotoxicity through the CYP3A4-dependent pathways. In summary, the current work determined PXR and CAR as key modulators of COBI hepatotoxicity. Given the fact that many prescription drugs and herbal supplements can activate PXR and CAR, these two receptors should be considered as targets to prevent COBI hepatotoxicity in the clinic.
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Affiliation(s)
- Amina I Shehu
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences
| | - Junjie Zhu
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences
| | - Jianhua Li
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences
| | - Jie Lu
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences
| | - Deborah McMahon
- Division of Infectious Diseases, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Wen Xie
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences
| | - Frank J Gonzalez
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892
| | - Xiaochao Ma
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences
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13
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Keniya MV, Monk BC. Attenuated apoptotic BAX expression as a xenobiotic reporter in Saccharomyces cerevisiae. FEMS Yeast Res 2020; 19:5530756. [PMID: 31291458 DOI: 10.1093/femsyr/foz048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 07/07/2019] [Indexed: 11/12/2022] Open
Abstract
Fungal infections are a major challenge to medicine and agriculture. Repeated and prophylactic use of antifungals can lead to pathogen cross-resistance to different classes of drugs. The early development of multidrug resistance in pathogenic fungi includes drug tolerance mediated by drug-dependent activation of drug efflux. In Saccharomyces cerevisiae and the fungal pathogen Candida glabrata, xenobiotic sensing motifs in transcription factors upregulate expression of several ATP-binding cassette (ABC) drug efflux pumps. We have therefore considered how drug candidates that trigger or prevent drug resistance could be identified and evaluated during drug discovery. We report a robust and sensitive, S. cerevisiae-based xenobiotic sensing system using the Pdr1 protein as a sensor and an attenuated version of the apoptotic murine BCL2-associated X (BAX) gene as a reporter. A molecular mechanism of attenuation that involves frameshift reversal may be associated with translation coupling and requires further investigation.
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Affiliation(s)
- Mikhail V Keniya
- The Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, PO Box 56, Dunedin, New Zealand
| | - Brian C Monk
- The Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, PO Box 56, Dunedin, New Zealand
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14
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Karri K, Waxman DJ. Widespread Dysregulation of Long Noncoding Genes Associated With Fatty Acid Metabolism, Cell Division, and Immune Response Gene Networks in Xenobiotic-exposed Rat Liver. Toxicol Sci 2020; 174:291-310. [PMID: 31926019 PMCID: PMC7098378 DOI: 10.1093/toxsci/kfaa001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Xenobiotic exposure dysregulates hundreds of protein-coding genes in mammalian liver, impacting many physiological processes and inducing diverse toxicological responses. Little is known about xenobiotic effects on long noncoding RNAs (lncRNAs), many of which have important regulatory functions. Here, we present a computational framework to discover liver-expressed, xenobiotic-responsive lncRNAs (xeno-lncs) with strong functional, gene regulatory potential and elucidate the impact of xenobiotic exposure on their gene regulatory networks. We assembled the long noncoding transcriptome of xenobiotic-exposed rat liver using RNA-seq datasets from male rats treated with 27 individual chemicals, representing 7 mechanisms of action (MOAs). Ortholog analysis was combined with coexpression data and causal inference methods to infer lncRNA function and deduce gene regulatory networks, including causal effects of lncRNAs on protein-coding gene expression and biological pathways. We discovered > 1400 liver-expressed xeno-lncs, many with human and/or mouse orthologs. Xenobiotics representing different MOAs often regulated common xeno-lnc targets: 123 xeno-lncs were dysregulated by ≥ 10 chemicals, and 5 xeno-lncs responded to ≥ 20 of the 27 chemicals investigated; 81 other xeno-lncs served as MOA-selective markers of xenobiotic exposure. Xeno-lnc-protein-coding gene coexpression regulatory network analysis identified xeno-lncs closely associated with exposure-induced perturbations of hepatic fatty acid metabolism, cell division, or immune response pathways, and with apoptosis or cirrhosis. We also identified hub and bottleneck lncRNAs, which are expected to be key regulators of gene expression. This work elucidates extensive networks of xeno-lnc-protein-coding gene interactions and provides a framework for understanding the widespread transcriptome-altering actions of foreign chemicals in a key-responsive mammalian tissue.
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Affiliation(s)
- Kritika Karri
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts
| | - David J Waxman
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts
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15
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Nakano M, Fukami T, Nakajima M. Adenosine Deaminases Acting on RNA Downregulate the Expression of Constitutive Androstane Receptor in the Human Liver–Derived Cells by Attenuating Splicing. J Pharmacol Exp Ther 2019; 370:408-415. [DOI: 10.1124/jpet.119.260109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Accepted: 06/28/2019] [Indexed: 12/18/2022] Open
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16
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Rampersaud A, Lodato NJ, Shin A, Waxman DJ. Widespread epigenetic changes to the enhancer landscape of mouse liver induced by a specific xenobiotic agonist ligand of the nuclear receptor CAR. Toxicol Sci 2019; 171:315-338. [PMID: 31236583 PMCID: PMC6760311 DOI: 10.1093/toxsci/kfz148] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 06/13/2019] [Accepted: 06/17/2019] [Indexed: 12/13/2022] Open
Abstract
CAR (Nr1i3), a liver nuclear receptor and xenobiotic sensor, induces drug, steroid and lipid metabolism and dysregulates genes linked to hepatocellular carcinogenesis, but its impact on the liver epigenome is poorly understood. TCPOBOP, a halogenated xenochemical and highly specific CAR agonist ligand, induces localized chromatin opening or closing at several thousand mouse liver genomic regions, discovered as differential DNase-hypersensitive sites (ΔDHS). Active enhancer and promoter histone marks induced by TCPOBOP were enriched at opening DHS and TCPOBOP-inducible genes. Enrichment of CAR binding and CAR motifs was seen at opening DHS and their inducible drug/lipid metabolism gene targets, and at many constitutively open DHS located nearby. TCPOBOP-responsive cell cycle and DNA replication genes co-dependent on MET/EGFR signaling for induction were also enriched for CAR binding. A subset of opening DHS and many closing DHS mapping to TCPOBOP-responsive target genes did not bind CAR, indicating an indirect mechanism for their changes in chromatin accessibility. TCPOBOP-responsive DHS were also enriched for induced binding of RXRA, CEBPA and CEBPB, and for motifs for liver-enriched factors that may contribute to liver-specific transcriptional responses to TCPOBOP exposure. These studies elucidate the enhancer landscape of TCPOBOP-exposed liver and the widespread epigenetic changes that are induced by both direct and indirect mechanisms linked to CAR activation. The global maps of thousands of environmental chemical-induced epigenetic changes described here constitute a rich resource for further research on xenochemical effects on liver chromatin states and the epigenome.
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Affiliation(s)
- Andy Rampersaud
- Department of Biology and Bioinformatics Program, Boston University, Boston, MA USA
| | - Nicholas J Lodato
- Department of Biology and Bioinformatics Program, Boston University, Boston, MA USA
| | - Aram Shin
- Department of Biology and Bioinformatics Program, Boston University, Boston, MA USA
| | - David J Waxman
- Department of Biology and Bioinformatics Program, Boston University, Boston, MA USA
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17
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Lodato NJ, Rampersaud A, Waxman DJ. Impact of CAR Agonist Ligand TCPOBOP on Mouse Liver Chromatin Accessibility. Toxicol Sci 2019; 164:115-128. [PMID: 29617930 DOI: 10.1093/toxsci/kfy070] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Activation of the nuclear receptor and transcription factor CAR (Nr1i3) by its specific agonist ligand TCPOBOP (1, 4-bis[2-(3, 5-dichloropyridyloxy)]benzene) dysregulates hundreds of genes in mouse liver and is linked to male-biased hepatocarcinogenesis. To elucidate the genomic organization of CAR-induced gene responses, we investigated the distribution of TCPOBOP-responsive RefSeq coding and long noncoding RNA (lncRNA) genes across the megabase-scale topologically associating domains (TADs) that segment the genome, and which provide a structural framework that functionally constrains enhancer-promoter interactions. We show that a subset of TCPOBOP-responsive genes cluster within TADs, and that TCPOBOP-induced genes and TCPOBOP-repressed genes are often found in different TADs. Further, using DNase-seq and DNase hypersensitivity site (DHS) analysis, we identified several thousand genomic regions (ΔDHS) where short-term exposure to TCPOBOP induces localized changes (increases or decreases) in mouse liver chromatin accessibility, many of which cluster in TADs together with TCPOBOP-responsive genes. Sites of chromatin opening were highly enriched nearby genes induced by TCPOBOP and chromatin closing was highly enriched nearby genes repressed by TCPOBOP, consistent with TCPOBOP-responsive ΔDHS serving as enhancers and promoters that positively regulate CAR-responsive genes. Gene expression changes lagged behind chromatin opening or closing for a subset of TCPOBOP-responsive ΔDHS. ΔDHS that were specifically responsive to TCPOBOP in male liver were significantly enriched for genomic regions with a basal male bias in chromatin accessibility; however, the male-biased response of hepatocellular carcinoma-related genes to TCPOBOP was not associated with a correspondingly male-biased ΔDHS response. These studies elucidate the genome-wide organization of CAR-responsive genes and of the thousands of associated genomic sites where TCPOBOP exposure induces both rapid and persistent changes in chromatin accessibility.
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Affiliation(s)
- Nicholas J Lodato
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts 02215
| | - Andy Rampersaud
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts 02215
| | - David J Waxman
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts 02215
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18
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Li AA, Makris SL, Marty MS, Strauss V, Gilbert ME, Blacker A, Zorrilla LM, Coder PS, Hannas B, Lordi S, Schneider S. Practical considerations for developmental thyroid toxicity assessments: What's working, what's not, and how can we do better? Regul Toxicol Pharmacol 2019; 106:111-136. [PMID: 31018155 DOI: 10.1016/j.yrtph.2019.04.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 04/11/2019] [Accepted: 04/14/2019] [Indexed: 12/26/2022]
Abstract
Thyroid hormones (THs; T3 and T4) play a role in development of cardiovascular, reproductive, immune and nervous systems. Thus, interpretation of TH changes from rodent studies (during pregnancy, in fetuses, neonates, and adults) is critical in hazard characterization and risk assessment. A roundtable session at the 2017 Society of Toxicology (SOT) meeting brought together academic, industry and government scientists to share knowledge and different perspectives on technical and data interpretation issues. Data from a limited group of laboratories were compiled for technical discussions on TH measurements, including good practices for reliable serum TH data. Inter-laboratory historical control data, derived from immunoassays or mass spectrometry methods, revealed: 1) assay sensitivities vary within and across methodologies; 2) TH variability is similar across animal ages; 3) laboratories generally achieve sufficiently sensitive TH quantitation levels, although issues remain for lower levels of serum TH and TSH in fetuses and postnatal day 4 pups; thus, assay sensitivity is critical at these life stages. Best practices require detailed validation of rat serum TH measurements across ages to establish assay sensitivity and precision, and identify potential matrix effects. Finally, issues related to data interpretation for biological understanding and risk assessment were discussed, but their resolution remains elusive.
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Affiliation(s)
- Abby A Li
- Exponent Inc., 1010 14th Street, San Francisco, CA, 94114, USA.
| | - Susan L Makris
- US Environmental Protection Agency Office of Research and Development, 1200 Pennsylvania Ave NW 8623R, Washington, DC, 20460, USA.
| | - M Sue Marty
- The Dow Chemical Company, Toxicology & Environmental Research and Consulting, 1803 Building, Midland, MI, 48674, USA.
| | - Volker Strauss
- BASF SE, Experimental Toxicology and Ecology, 67056, Ludwigshafen, Germany.
| | - Mary E Gilbert
- US Environmental Protection Agency, National Health Environmental Effects Research Lab, 109 T.W. Alexander Drive, MD B105 05, Research Triangle Park, NC, 27711, USA.
| | - Ann Blacker
- Bayer CropScience, P.O. Box 12014, RTP, NC, 27709, USA.
| | | | - Pragati S Coder
- Charles River Laboratories, Developmental and Reproductive Toxicology, 1407 George Road, Ashland, OH, 44805, USA.
| | - Bethany Hannas
- The Dow Chemical Company, Toxicology & Environmental Research and Consulting, 1803 Building, Midland, MI, 48674, USA.
| | - Sheri Lordi
- Charles River Laboratories International, 251 Ballardvale Street, Wilmington, MA, 01887, USA.
| | - Steffen Schneider
- BASF SE, Experimental Toxicology and Ecology, 67056, Ludwigshafen, Germany.
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19
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Hudson G, Flannigan KL, Venu VKP, Alston L, Sandall CF, MacDonald JA, Muruve DA, Chang TKH, Mani S, Hirota SA. Pregnane X Receptor Activation Triggers Rapid ATP Release in Primed Macrophages That Mediates NLRP3 Inflammasome Activation. J Pharmacol Exp Ther 2019; 370:44-53. [PMID: 31004077 PMCID: PMC6542184 DOI: 10.1124/jpet.118.255679] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 04/08/2019] [Indexed: 12/15/2022] Open
Abstract
The pregnane X receptor (PXR) is a ligand-activated nuclear receptor that acts as a xenobiotic sensor, responding to compounds of foreign origin, including pharmaceutical compounds, environmental contaminants, and natural products, to induce transcriptional events that regulate drug detoxification and efflux pathways. As such, the PXR is thought to play a key role in protecting the host from xenobiotic exposure. More recently, the PXR has been reported to regulate the expression of innate immune receptors in the intestine and modulate inflammasome activation in the vasculature. In the current study, we report that activation of the PXR in primed macrophages triggers caspase-1 activation and interleukin-1β release. Mechanistically, we show that this response is nucleotide-binding oligomerization domain, leucine-rich repeat, and pyrin domain-containing 3-dependent and is driven by the rapid efflux of ATP and P2X purinoceptor 7 activation following PXR stimulation, an event that involves pannexin-1 gating, and is sensitive to inhibition of Src-family kinases. Our findings identify a mechanism whereby the PXR drives innate immune signaling, providing a potential link between xenobiotic exposure and the induction of innate inflammatory responses.
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Affiliation(s)
- Grace Hudson
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
| | - Kyle L Flannigan
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
| | - Vivek Krishna Pulakazhi Venu
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
| | - Laurie Alston
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
| | - Christina F Sandall
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
| | - Justin A MacDonald
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
| | - Daniel A Muruve
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
| | - Thomas K H Chang
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
| | - Sridhar Mani
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
| | - Simon A Hirota
- Departments of Physiology and Pharmacology (G.H., K.L.F., V.K.P.V., L.A., S.A.H.), Biochemistry and Molecular Biology (C.F.S., J.A.M.), Medicine (D.A.M.), and Immunology, Microbiology, and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (T.K.H.C.); and Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (S.M.)
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20
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Chen K, Zhong J, Hu L, Li R, Du Q, Cai J, Li Y, Gao Y, Cui X, Yang X, Wu X, Yao L, Dai J, Wang Y, Jin H. The Role of Xenobiotic Receptors on Hepatic Glycolipid Metabolism. Curr Drug Metab 2019; 20:29-35. [PMID: 30227815 DOI: 10.2174/1389200219666180918152241] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 03/13/2018] [Accepted: 08/20/2018] [Indexed: 01/14/2023]
Abstract
Background:
PXR (Pregnane X Receptor) and CAR (Constitutive Androstane Receptor) are termed as
xenobiotic receptors, which are known as core factors in regulation of the transcription of metabolic enzymes and
drug transporters. However, accumulating evidence has shown that PXR and CAR exert their effects on energy metabolism
through the regulation of gluconeogenesis, lipogenesis and β-oxidation. Therefore, in this review, we are
trying to summary recent advances to show how xenobiotic receptors regulate energy metabolism.
Methods:
A structured search of databases has been performed by using focused review topics. According to conceptual
framework, the main idea of research literature was summarized and presented.
Results:
For introduction of each receptor, the general introduction and the critical functions in hepatic glucose and
lipid metabolism have been included. Recent important studies have shown that CAR acts as a negative regulator of
lipogenesis, gluconeogenesis and β -oxidation. PXR activation induces lipogenesis, inhibits gluconeogenesis and
inhabits β-oxidation.
Conclusion:
In this review, the importance of xenobiotic receptors in hepatic glucose and lipid metabolism has been
confirmed. Therefore, PXR and CAR may become new therapeutic targets for metabolic syndrome, including obesity
and diabetes. However, further research is required to promote the clinical application of this new energy metabolism
function of xenobiotic receptors.
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Affiliation(s)
- Ke Chen
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jinwei Zhong
- Department of Gastroenterology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Lin Hu
- Pi-wei Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Ruliu Li
- Pi-wei Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Qun Du
- Pi-wei Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jiazhong Cai
- Pi-wei Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yanwu Li
- Pi-wei Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yong Gao
- Pi-wei Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xiaona Cui
- Department of Pathogenic Biology and Immunology, Jiangsu Key Laboratory of Immunity and Metabolism, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Xiaoying Yang
- Department of Pathogenic Biology and Immunology, Jiangsu Key Laboratory of Immunity and Metabolism, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Xiaojie Wu
- Department of Immunology, Binzhou Medical University, Yantai, Shangdong, China
| | - Lu Yao
- Jilin Medical University, Jilin, China
| | - Juji Dai
- School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Yan Wang
- Department of Otolaryngology, The Second Affiliated Hospital & Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Haiyong Jin
- Department of Otolaryngology, The Second Affiliated Hospital & Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
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21
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Abbott KL, Chaudhury CS, Chandran A, Vishveshwara S, Dvorak Z, Jiskrova E, Poulikova K, Vyhlidalova B, Mani S, Pondugula SR. Belinostat, at Its Clinically Relevant Concentrations, Inhibits Rifampicin-Induced CYP3A4 and MDR1 Gene Expression. Mol Pharmacol 2019; 95:324-334. [PMID: 30622215 PMCID: PMC6362450 DOI: 10.1124/mol.118.114587] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 01/03/2019] [Indexed: 01/26/2023] Open
Abstract
Activation of human pregnane X receptor (hPXR) has been associated with induction of chemoresistance. It has been proposed that such chemoresistance via cytochrome P450/drug transporters can be reversed with the use of antagonists that specifically abrogate agonist-mediated hPXR activation. Unfortunately, proposed antagonists lack the specificity and appropriate pharmacological characteristics that allow these features to be active in the clinic. We propose that, ideally, an hPXR antagonist would be a cancer drug itself that is part of a "cancer drug cocktail" and effective as an hPXR antagonist at therapeutic concentrations. Belinostat (BEL), a histone deacetylase inhibitor approved for the treatment of relapsed/refractory peripheral T-cell lymphoma, and often used in combination with chemotherapy, is an attractive candidate based on its hPXR ligand-like features. We sought to determine whether these features of BEL might allow it to behave as an antagonist in combination chemotherapy regimens that include hPXR activators. BEL represses agonist-activated hPXR target gene expression at its therapeutic concentrations in human primary hepatocytes and LS174T human colon cancer cells. BEL repressed rifampicin-induced gene expression of CYP3A4 and multidrug resistance protein 1, as well as their respective protein activities. BEL decreased rifampicin-induced resistance to SN-38, the active metabolite of irinotecan, in LS174T cells. This finding indicates that BEL could suppress hPXR agonist-induced chemoresistance. BEL attenuated the agonist-induced steroid receptor coactivator-1 interaction with hPXR, and, together with molecular docking studies, the study suggests that BEL directly interacts with multiple sites on hPXR. Taken together, our results suggest that BEL, at its clinically relevant therapeutic concentration, can antagonize hPXR agonist-induced gene expression and chemoresistance.
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Affiliation(s)
- Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Chloe S Chaudhury
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Aneesh Chandran
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Saraswathi Vishveshwara
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Zdenek Dvorak
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Eva Jiskrova
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Karolina Poulikova
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Barbora Vyhlidalova
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Sridhar Mani
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
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Pharmacokinetic Changes during Pregnancy According to Genetic Variants: a Prospective Study in HIV-Infected Patients Receiving Atazanavir-Ritonavir. Antimicrob Agents Chemother 2018; 62:AAC.00309-18. [PMID: 29760129 DOI: 10.1128/aac.00309-18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 04/21/2018] [Indexed: 01/11/2023] Open
Abstract
Atazanavir-ritonavir concentrations change over time during pregnancy in HIV-positive patients; the impact of genetic variants is unknown. Twenty patients were enrolled in this study; plasma and intracellular concentrations of antiretrovirals were measured, in addition to single-nucleotide polymorphisms in transport-related genes. Linear logistic regression showed that genetic variants in organic-anion-transporter-1B1- and pregnane-X-receptor-encoding genes affected third-trimester atazanavir exposure. In this prospective study, genetic variants partially explained the observed interpatient variability in third-trimester exposure to antiretrovirals.
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Stable cellular models of nuclear receptor PXR for high-throughput evaluation of small molecules. Toxicol In Vitro 2018; 52:222-234. [PMID: 29933105 DOI: 10.1016/j.tiv.2018.06.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 05/28/2018] [Accepted: 06/18/2018] [Indexed: 12/11/2022]
Abstract
Pregnane & Xenobiotic Receptor (PXR) is one of the 48 members of the ligand-modulated transcription factors belonging to nuclear receptor superfamily. Though PXR is now well-established as a 'xenosensor', regulating the central detoxification and drug metabolizing machinery, it has also emerged as a key player in several metabolic disorders. This makes PXR attractive to both, researchers and pharmaceutical industry since clinical success of small drug molecules can be pre-evaluated on PXR platform. At the early stages of drug discovery, cell-based assays are used for high-throughput screening of small molecules. The future success or failure of a drug can be predicted by this approach saving expensive resources and time. In view of this, we have developed human liver cell line-based, dual-level screening and validation protocol on PXR platform having application to assess small molecules. We have generated two different stably transfected cell lines, (i) a stable promoter-reporter cell line (HepXREM) expressing PXR and a commonly used CYP3A4 promoter-reporter i.e. XREM-luciferase; and (ii) two stable cell lines integrated with proximal PXR-promoter-reporter (Hepx-1096/+43 and Hepx-497/+43). Employing HepXREM, Hepx-1096/+43 and Hepx-497/+43 stable cell lines > 25 anti-cancer herbal drug ingredients were screened for examining their modulatory effects on a) PXR transcriptional activity and, b) PXR-promoter activity. In conclusion, the present report provides a convenient and economical, dual-level screening system to facilitate the identification of superior therapeutic small molecules.
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Lodato NJ, Melia T, Rampersaud A, Waxman DJ. Sex-Differential Responses of Tumor Promotion-Associated Genes and Dysregulation of Novel Long Noncoding RNAs in Constitutive Androstane Receptor-Activated Mouse Liver. Toxicol Sci 2018; 159:25-41. [PMID: 28903501 DOI: 10.1093/toxsci/kfx114] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Xenobiotic agonists of constitutive androstane receptor (CAR) induce many hepatic drug metabolizing enzymes, but following prolonged exposure, promote hepatocellular carcinoma, most notably in male mouse liver. Here, we used nuclear RNA-seq to characterize global changes in the mouse liver transcriptome following exposure to the CAR-specific agonist ligand 1,4-bis-[2-(3,5-dichloropyridyloxy)]benzene (TCPOBOP), including changes in novel long noncoding RNAs that may contribute to xenobiotic-induced pathophysiology. Protein-coding genes dysregulated by 3 h TCPOBOP exposure were strongly enriched in KEGG pathways of xenobiotic and drug metabolism, with stronger and more extensive gene responses observed in female than male liver. After 27 h TCPOBOP exposure, the number of responsive genes increased >8-fold in males, where the top enriched pathways and their upstream regulators expanded to include factors implicated in cell cycle dysregulation and hepatocellular carcinoma progression (cyclin-D1, oncogenes E2f, Yap, Rb, Myc, and proto-oncogenes β-catenin, FoxM1, FoxO1, all predicted to be activated by TCPOBOP in male but not female liver; and tumor suppressors p21 and p53, both predicted to be inhibited). Upstream regulators uniquely associated with 3 h TCPOBOP-exposed females include TNF/NFkB pathway members, which negatively regulate CAR-dependent proliferative responses and may contribute to the relative resistance of female liver to TCPOBOP-induced tumor promotion. These responses may be modified by the many long noncoding liver RNAs we show are dysregulated by TCPOBOP or pregnane-X-receptor agonist exposure, including lncRNAs proximal to CAR target genes Cyp2b10, Por, and Alas1. These data provide a comprehensive view of the CAR-regulated transcriptome and give insight into the mechanism of sex-biased susceptibility to CAR-dependent mouse liver tumorigenesis.
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Affiliation(s)
- Nicholas J Lodato
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts 02215
| | - Tisha Melia
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts 02215
| | - Andy Rampersaud
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts 02215
| | - David J Waxman
- Department of Biology and Bioinformatics Program, Boston University, Boston, Massachusetts 02215
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25
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Wang F, Wu Y, Xie X, Sun J, Chen W. Essential role of nuclear receptors for the evaluation of the benefits of bioactive herbal extracts on liver function. Pharmacotherapy 2018; 99:798-809. [DOI: 10.1016/j.biopha.2018.01.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 12/29/2017] [Accepted: 01/03/2018] [Indexed: 02/07/2023]
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26
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Yoshimaru S, Shizu R, Tsuruta S, Amaike Y, Kano M, Hosaka T, Sasaki T, Yoshinari K. Acceleration of murine hepatocyte proliferation by imazalil through the activation of nuclear receptor PXR. J Toxicol Sci 2018; 43:443-450. [DOI: 10.2131/jts.43.443] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Shohei Yoshimaru
- Laboratory of Molecular Toxicology, School of Pharmaceutical Sciences, University of Shizuoka
| | - Ryota Shizu
- Laboratory of Molecular Toxicology, School of Pharmaceutical Sciences, University of Shizuoka
| | - Satoshi Tsuruta
- Laboratory of Molecular Toxicology, School of Pharmaceutical Sciences, University of Shizuoka
| | - Yuto Amaike
- Laboratory of Molecular Toxicology, School of Pharmaceutical Sciences, University of Shizuoka
| | - Makoto Kano
- Laboratory of Molecular Toxicology, School of Pharmaceutical Sciences, University of Shizuoka
| | - Takuomi Hosaka
- Laboratory of Molecular Toxicology, School of Pharmaceutical Sciences, University of Shizuoka
| | - Takamitsu Sasaki
- Laboratory of Molecular Toxicology, School of Pharmaceutical Sciences, University of Shizuoka
| | - Kouichi Yoshinari
- Laboratory of Molecular Toxicology, School of Pharmaceutical Sciences, University of Shizuoka
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Gahir SS, Piquette-Miller M. The Role of PXR Genotype and Transporter Expression in the Placental Transport of Lopinavir in Mice. Pharmaceutics 2017; 9:pharmaceutics9040049. [PMID: 29064386 PMCID: PMC5750655 DOI: 10.3390/pharmaceutics9040049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 10/19/2017] [Accepted: 10/20/2017] [Indexed: 12/23/2022] Open
Abstract
Lopinavir (LPV), an antiretroviral protease inhibitor frequently prescribed in HIV-positive pregnancies, is a substrate of Abcb1 and Abcc2. As differences in placental expression of these transporters were seen in Pregnane X Receptor (PXR) −/− mice, we examined the impact of placental transporter expression and fetal PXR genotype on the fetal accumulation of LPV. PXR +/− dams bearing PXR +/+, PXR +/−, and PXR −/− fetuses were generated by mating PXR +/− female mice with PXR +/− males. On gestational day 17, dams were administered 10 mg/kg LPV (i.v.) and sacrificed 30 min post injection. Concentrations of LPV in maternal plasma and fetal tissue were measured by LC-MS/MS, and transporter expression was determined by quantitative RT-PCR. As compared to the PXR +/+ fetal units, placental expression of Abcb1a, Abcc2, and Abcg2 mRNA were two- to three-fold higher in PXR −/− fetuses (p < 0.05). Two-fold higher fetal:maternal LPV concentration ratios were also seen in the PXR +/+ as compared to the PXR −/− fetuses (p < 0.05), and this significantly correlated to the placental expression of Abcb1a (r = 0.495; p < 0.005). Individual differences in the expression of placental transporters due to genetic or environmental factors can impact fetal exposure to their substrates.
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Affiliation(s)
- Sarabjit S Gahir
- Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, ON M5S 3M2, Canada.
- Reata Pharmaceuticals, Irving, TX 75063, USA.
| | - Micheline Piquette-Miller
- Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, ON M5S 3M2, Canada.
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28
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Yokobori K, Kobayashi K, Azuma I, Akita H, Chiba K. Intracellular localization of pregnane X receptor in HepG2 cells cultured by the hanging drop method. Drug Metab Pharmacokinet 2017; 32:265-272. [DOI: 10.1016/j.dmpk.2017.08.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 08/05/2017] [Accepted: 08/17/2017] [Indexed: 11/25/2022]
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29
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Kodama S, Shimura T, Kuribayashi H, Abe T, Yoshinari K. Pregnenolone 16α-carbonitrile ameliorates concanavalin A-induced liver injury in mice independent of the nuclear receptor PXR activation. Toxicol Lett 2017; 271:58-65. [PMID: 28237809 DOI: 10.1016/j.toxlet.2017.02.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 02/02/2017] [Accepted: 02/20/2017] [Indexed: 12/19/2022]
Abstract
The pregnane X receptor (PXR) is well-known as a key regulator of drug/xenobiotic clearance. Upon activation by ligand, PXR transcriptionally upregulates the expression of drug-metabolizing enzymes and drug transporters. Recent studies have revealed that PXR also plays a role in regulating immune/inflammatory responses. Specific PXR activators, including synthetic ligands and phytochemicals, have been shown to ameliorate chemically induced colitis in mice. In this study, we investigated an anti-inflammatory effect of pregnenolone 16α-carbonitrile (PCN), a prototypical activator for rodent PXR, in concanavalin A (Con A)-induced liver injury, a model of immune-mediated liver injury, using wild-type and Pxr-/- mice. Unexpectedly, pretreatment with PCN significantly ameliorated Con A-induced liver injury in not only wild-type but Pxr-/- mice as well, accompanied with lowered plasma ALT levels and histological improvements. Pretreatment with PCN was found to significantly repress the induction of Cxcl2 and Ccl2 mRNA expression and neutrophil infiltration into the liver of both wild-type and Pxr-/- mice at the early time point of Con A-induced liver injury. Our results indicate that PCN has unexpected immunosuppressive activity independent of PXR activation to protect mice from immune-mediated liver injury induced by Con A.
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Affiliation(s)
- Susumu Kodama
- Division of Drug Metabolism and Molecular Toxicology, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan; Laboratory of Pharmacotherapy of Life-Style Diseases, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan.
| | - Takuto Shimura
- Division of Drug Metabolism and Molecular Toxicology, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Hideaki Kuribayashi
- Division of Drug Metabolism and Molecular Toxicology, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Taiki Abe
- Division of Drug Metabolism and Molecular Toxicology, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Kouichi Yoshinari
- Division of Drug Metabolism and Molecular Toxicology, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan; Department of Molecular Toxicology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, Shizuoka 422-8526, Japan
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30
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Shi B, Su Y, Chang S, Sun Y, Meng X, Shan A. Vitamin C protects piglet liver against zearalenone-induced oxidative stress by modulating expression of nuclear receptors PXR and CAR and their target genes. Food Funct 2017; 8:3675-3687. [DOI: 10.1039/c7fo01301a] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zearalenone (ZEN), a common mycotoxin found in human food and animal feed, is effectively detoxified by vitamin C by modulation of the nuclear receptor signaling pathway.
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Affiliation(s)
- Baoming Shi
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Yang Su
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Siying Chang
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Yuchen Sun
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Xiangyu Meng
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Anshan Shan
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
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31
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Lee K, You H, Choi J, No KT. Development of pharmacophore-based classification model for activators of constitutive androstane receptor. Drug Metab Pharmacokinet 2016; 32:172-178. [PMID: 28366619 DOI: 10.1016/j.dmpk.2016.11.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 09/21/2016] [Accepted: 11/10/2016] [Indexed: 10/20/2022]
Abstract
Constitutive androstane receptor (CAR) is predominantly expressed in the liver and is important for regulating drug metabolism and transport. Despite its biological importance, there have been few attempts to develop in silico models to predict the activity of CAR modulated by chemical compounds. The number of in silico studies of CAR may be limited because of CAR's constitutive activity under normal conditions, which makes it difficult to elucidate the key structural features of the interaction between CAR and its ligands. In this study, to address these limitations, we introduced 3D pharmacophore-based descriptors with an integrated ligand and structure-based pharmacophore features, which represent the receptor-ligand interaction. Machine learning methods (support vector machine and artificial neural network) were applied to develop an in silico model with the descriptors containing significant information regarding the ligand binding positions. The best classification model built with a solvent accessibility volume-based filter and the support vector machine showed good predictabilities of 87%, and 85.4% for the training set and validation set, respectively. This demonstrates that our model can be used to accurately predict CAR activators and offers structural information regarding ligand/protein interactions.
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Affiliation(s)
- Kyungro Lee
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, South Korea
| | - Hwan You
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, South Korea
| | - Jiwon Choi
- Bioinformatics & Molecular Design Research Center, Yonsei University, Seoul 03722, South Korea
| | - Kyoung Tai No
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, South Korea; Bioinformatics & Molecular Design Research Center, Yonsei University, Seoul 03722, South Korea.
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32
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Amacher DE. The regulation of human hepatic drug transporter expression by activation of xenobiotic-sensing nuclear receptors. Expert Opin Drug Metab Toxicol 2016; 12:1463-1477. [PMID: 27548410 DOI: 10.1080/17425255.2016.1223626] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
INTRODUCTION If a drug is found to be an inducer of hepatic drug metabolizing enzymes via activation of nuclear receptors such as pregnane X receptor (PXR) or constitutive androstane receptor (CAR), it is likely that drug transporters regulated through these same receptors will be induced as well. This review highlights what is currently known about the molecular mechanisms that regulate transporter expression and where the research is directed. Areas covered: This review is focused on publications that describe the role of activated hepatic nuclear receptors in the subsequent regulation of drug uptake and/or efflux transporters following exposure to xenobiotics. Expert opinion: Many of the published studies on the role of nuclear receptors in the regulation of drug transporters involve non-human test animals. But due to species response differences, these associations are not always applicable to humans. For this reason, some relevant human in vitro models have been developed, such as primary or cryopreserved human hepatocytes, human liver slices, or HepG2 or HuH7 cell lines transiently or stably transfected with PXR expression and reporter constructs as well as in vivo models such as PXR-humanized mice. These human-relevant test systems will continue to be developed and applied for the testing of investigational drugs.
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Erratico C, Zheng X, van den Eede N, Tomy G, Covaci A. Stereoselective Metabolism of α-, β-, and γ-Hexabromocyclododecanes (HBCDs) by Human Liver Microsomes and CYP3A4. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:8263-8273. [PMID: 27401979 DOI: 10.1021/acs.est.6b01059] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This is the first study investigating the in vitro metabolism of α-, β-, and γ-hexabromocyclododecane (HBCD) stereoisomers in humans and providing semiquantitative metabolism data. Human liver microsomes were incubated with individual racemic mixtures and with individual stereoisomers of α-, β-, and γ-HBCDs, the hydroxylated metabolites formed were analyzed by liquid chromatography-tandem mass spectrometry, and the value of the intrinsic in vitro clearance (Clint,vitro) was calculated. Several mono- and dihydroxylated metabolites of α-, β-, and γ-HBCDs were formed, with mono-OH-HBCDs being the major metabolites. No stereoisomerization of any of the six α-, β-, and γ-HBCD isomers catalyzed by cytochrome P450 (CYP) enzymes occurred. The value of Clint,vitro of α-HBCDs was significantly lower than that of β-HBCDs, which, in turn, was significantly lower than that of γ-HBCDs (p < 0.05). Such differences were explained by the significantly lower values of Clint,vitro of each α-HBCD stereoisomer than those of the β- and γ-HBCD stereoisomers. In addition, significantly lower values of Clint,vitro of the (-) over the (+)α- and β-HBCD stereoisomers, but not γ-HBCDs, were obtained. Our data offer a possible explanation of the enrichment of α-HBCDs over β- and γ-HBCDs on the one hand and, on the other hand, of (-)α-HBCDs over (+)α-HBCDs previously reported in human samples. It also offers information about the mechanism resulting in such enrichments, the stereoisomer-selective metabolism of α-, β-, and γ-HBCDs catalyzed by CYPs with the lack of stereoisomerization.
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Affiliation(s)
- Claudio Erratico
- Toxicological Center, University of Antwerp , Universiteitsplein 1, 2610 Wilrijk, Belgium
| | - Xiaobo Zheng
- Toxicological Center, University of Antwerp , Universiteitsplein 1, 2610 Wilrijk, Belgium
- Guangzhou Institute of Geochemistry, Chinese Academy of Sciences , Guangzhou 510640, China
| | - Nele van den Eede
- Toxicological Center, University of Antwerp , Universiteitsplein 1, 2610 Wilrijk, Belgium
| | - Gregg Tomy
- Department of Chemistry, University of Manitoba , Winnipeg R3T 2N2, Canada
| | - Adrian Covaci
- Toxicological Center, University of Antwerp , Universiteitsplein 1, 2610 Wilrijk, Belgium
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Huang Y, Hoque MT, Jenabian MA, Vyboh K, Whyte SK, Sheehan NL, Brassard P, Bélanger M, Chomont N, Fletcher CV, Routy JP, Bendayan R. Antiretroviral drug transporters and metabolic enzymes in human testicular tissue: potential contribution to HIV-1 sanctuary site. J Antimicrob Chemother 2016; 71:1954-65. [PMID: 27076103 DOI: 10.1093/jac/dkw046] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Accepted: 01/29/2016] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVES The testes are a potential viral sanctuary site for HIV-1 infection. Our study aims to provide insight into the expression and localization of key drug transporters and metabolic enzymes relevant to ART in this tissue compartment. METHODS We characterized gene and protein expression of 12 representative drug transporters and two metabolic enzymes in testicular tissue samples obtained from uninfected (n = 8) and virally suppressed HIV-1-infected subjects on ART (n = 5) and quantified antiretroviral drug concentrations in plasma and testicular tissues using LC/MS/MS from HIV-1-infected subjects. RESULTS Our data demonstrate that key ABC drug transporters (permeability glycoprotein, multidrug-resistance protein 1, 2 and 4, and breast cancer resistance protein), solute carrier transporters (organic anion transporting polypeptides 1B1 and 2B1, organic anion transporter 1, concentrative nucleoside transporter 1, equilibrative nucleoside transporter 2) and cytochrome P450 metabolic enzymes (CYP3A4 and CYP2D6) previously shown to interact with many commonly used antiretroviral drugs are expressed at the mRNA and protein level in the testes of both subject groups and localize primarily at the blood-testis barrier, with no significant differences between the two groups. Furthermore, we observed that PIs known to be substrates for ATP-binding cassette membrane transporters, displayed variable testicular tissue penetration, with darunavir concentrations falling below therapeutic values. In contrast, the NRTIs emtricitabine, lamivudine and tenofovir displayed favourable tissue penetration, reaching concentrations comparable to plasma levels. We also demonstrated that nuclear receptors, peroxisome proliferator-activated receptors α and γ exhibited higher gene expression in the testicular tissue compared with pregnane X receptor and constitutive androstane receptor, suggesting a potential regulatory pathway governing drug transporter and metabolic enzyme expression in this tissue compartment. CONCLUSIONS Our data suggest the testes are a complex pharmacological compartment that can restrict the distribution of certain antiretroviral drugs and potentially contribute to HIV-1 persistence.
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Affiliation(s)
- Yiying Huang
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Canada
| | - Md Tozammel Hoque
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Canada
| | - Mohammad-Ali Jenabian
- Department of Biological Sciences, Université du Québec à Montréal (UQAM), Montréal, Canada
| | - Kishanda Vyboh
- Chronic Viral Illness Service, McGill University Health Centre, Montréal, Canada
| | - Sana-Kay Whyte
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Canada
| | - Nancy L Sheehan
- Faculty of Pharmacy, Université de Montréal, Montréal, Canada
| | | | - Maud Bélanger
- Metropolitan Centre of Plastic Surgery, Montréal, Canada
| | - Nicolas Chomont
- University of Montréal Hospital Research Centre, Montréal, Canada
| | - Courtney V Fletcher
- Antiviral Pharmacology Laboratory, University of Nebraska Medical Center, Omaha, NE, USA
| | - Jean-Pierre Routy
- Chronic Viral Illness Service, McGill University Health Centre, Montréal, Canada
| | - Reina Bendayan
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Canada
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Hakkola J, Rysä J, Hukkanen J. Regulation of hepatic energy metabolism by the nuclear receptor PXR. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2016; 1859:1072-1082. [PMID: 27041449 DOI: 10.1016/j.bbagrm.2016.03.012] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 03/21/2016] [Accepted: 03/22/2016] [Indexed: 12/30/2022]
Abstract
The pregnane X receptor (PXR) is a nuclear receptor that is traditionally thought to be specialized for sensing xenobiotic exposure. In concurrence with this feature PXR was originally identified to regulate drug-metabolizing enzymes and transporters. During the last ten years it has become clear that PXR harbors broader functions. Evidence obtained both in experimental animals and humans indicate that ligand-activated PXR regulates hepatic glucose and lipid metabolism and affects whole body metabolic homeostasis. Currently, the consequences of PXR activation on overall metabolic health are not yet fully understood and varying results on the effect of PXR activation or knockout on metabolic disorders and weight gain have been published in mouse models. Rifampicin and St. John's wort, the prototypical human PXR agonists, impair glucose tolerance in healthy volunteers. Chronic exposure to PXR agonists could potentially represent a risk factor for diabetes and metabolic syndrome. This article is part of a Special Issue entitled: Xenobiotic nuclear receptors: New Tricks for An Old Dog, edited by Dr. Wen Xie.
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Affiliation(s)
- Jukka Hakkola
- Research Unit of Biomedicine, Pharmacology and Toxicology, University of Oulu, Oulu, Finland; Medical Research Center Oulu, Oulu University Hospital, University of Oulu, Oulu, Finland.
| | - Jaana Rysä
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
| | - Janne Hukkanen
- Medical Research Center Oulu, Oulu University Hospital, University of Oulu, Oulu, Finland; Research Unit of Internal Medicine, University of Oulu, Oulu, Finland; Department of Internal Medicine, Oulu University Hospital, Oulu, Finland; Biocenter Oulu, Oulu, Finland
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Mackowiak B, Wang H. Mechanisms of xenobiotic receptor activation: Direct vs. indirect. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2016; 1859:1130-1140. [PMID: 26877237 DOI: 10.1016/j.bbagrm.2016.02.006] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 02/05/2016] [Accepted: 02/06/2016] [Indexed: 12/31/2022]
Abstract
The so-called xenobiotic receptors (XRs) have functionally evolved into cellular sensors for both endogenous and exogenous stimuli by regulating the transcription of genes encoding drug-metabolizing enzymes and transporters, as well as those involving energy homeostasis, cell proliferation, and/or immune responses. Unlike prototypical steroid hormone receptors, XRs are activated through both direct ligand-binding and ligand-independent (indirect) mechanisms by a plethora of structurally unrelated chemicals. This review covers research literature that discusses direct vs. indirect activation of XRs. A particular focus is centered on the signaling control of the constitutive androstane receptor (CAR), the pregnane X receptor (PXR), and the aryl hydrocarbon receptor (AhR). We expect that this review will shed light on both the common and distinct mechanisms associated with activation of these three XRs. This article is part of a Special Issue entitled: Xenobiotic nuclear receptors: New Tricks for An Old Dog, edited by Dr. Wen Xie.
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Affiliation(s)
- Bryan Mackowiak
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, 20 Penn Street, Baltimore, MD 21201, United States
| | - Hongbing Wang
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, 20 Penn Street, Baltimore, MD 21201, United States.
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van den Berg H, Paulussen M, Le Teuff G, Judson I, Gelderblom H, Dirksen U, Brennan B, Whelan J, Ladenstein RL, Marec-Berard P, Kruseova J, Hjorth L, Kühne T, Brichard B, Wheatley K, Craft A, Juergens H, Gaspar N, Le Deley MC. Impact of gender on efficacy and acute toxicity of alkylating agent -based chemotherapy in Ewing sarcoma: secondary analysis of the Euro-Ewing99-R1 trial. Eur J Cancer 2015; 51:2453-64. [PMID: 26271204 DOI: 10.1016/j.ejca.2015.06.123] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 04/20/2015] [Accepted: 06/17/2015] [Indexed: 11/16/2022]
Abstract
BACKGROUND Based on the randomised Euro-EWING99-R1 trial, vincristine, adriamycin, cyclophosphamide (VAC) may be able to replace vincristine, adriamycin, ifosfamide (VAI) in the treatment of standard-risk Ewing sarcoma. However some heterogeneity of treatment effect by gender was observed. The current exploratory study aimed at investigating the influence of gender on treatment efficacy and acute toxicity. PATIENTS AND METHODS Impact of gender on event-free survival (EFS), acute toxicity by course, switches between treatment arms and cumulative dose of alkylating agents was evaluated in multivariable models adjusted for age including terms to test for heterogeneity of treatment effect by gender. The analysis of the EFS was performed on the intention-to-treat population. RESULTS EFS did not significantly differ between the 509 males and 347 females (p=0.33), but an interaction in terms of efficacy was suspected between treatment and gender (p=0.058): VAC was associated with poorer EFS than VAI in males, hazard ratio (HR) (VAC/VAI)=1.37 [95% confidence interval (CI), 0.98-1.90], contrasting with HR=0.81 [95%CI, 0.53-1.24] in females. Severe toxicity was more frequent in females, whatever the toxicity type. Thirty patients switched from VAI to VAC (9/251 males, 4%, and 21/174 females, 12%) mostly due to renal toxicity, and three from VAC to VAI (2/258 males, 0.8%, and 1/173 females, 0.6%). A reduction of alkylating agent cumulative dose >20% was more frequent in females (15% versus 9%, p=0.005), with no major difference between VAC and VAI (10% versus 13%, p=0.15). CONCLUSION Differences of acute toxicity rate and cumulative doses of alkylating agents could not explain the marginal interaction observed in the Euro-EWING99-R1 trial data. Effects of gender-dependent polymorphism/activity of metabolic enzymes (e.g. known for CYP2B6) of ifosfamide versus cyclophosphamide should be explored. External data are required to further evaluate whether there is heterogeneity of alkylating agent effect by gender. TRIAL NUMBERS NCT00987636 and EudraCT 2008-003658-13.
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Affiliation(s)
- Henk van den Berg
- Emma Children's Hospital/Academic Medical Center, Amsterdam, The Netherlands
| | - Michael Paulussen
- Vestische Kinder-und Jugendklinik Datteln, Witten/Herdecke University, Datteln, Germany
| | | | - Ian Judson
- The Royal Marsden NHS Foundation Trust, London, United Kingdom
| | | | - Uta Dirksen
- Department of Paediatric Hematology and Oncology, University Hospital, Muenster, Germany
| | | | | | | | | | - Jarmila Kruseova
- Department of Paediatric Haematology and Oncology, Charles University, Motol Hospital, Prague, Czech Republic
| | - Lars Hjorth
- Skåne University Hospital, Lund University, Lund, Sweden
| | - Thomas Kühne
- University Children's Hospital Basel, Basel, Switzerland
| | | | - Keith Wheatley
- Cancer Research UK, Cancer Trials Unit, University of Birmingham, Birmingham
| | - Alan Craft
- United Kingdom Sir James Spence Institute, Newcastle upon Tyne, United Kingdom
| | - Heribert Juergens
- Department of Paediatric Hematology and Oncology, University Hospital, Muenster, Germany
| | | | - Marie-Cécile Le Deley
- Institute Gustave Roussy, Villejuif, France; Paris-Sud University, Le Kremlin-Bicêtre, France
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Richter I, Fidler AE. Tunicate pregnane X receptor (PXR) orthologs: Transcript characterization and natural variation. Mar Genomics 2015; 23:99-108. [DOI: 10.1016/j.margen.2015.05.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 05/06/2015] [Accepted: 05/06/2015] [Indexed: 12/12/2022]
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Screening Ingredients from Herbs against Pregnane X Receptor in the Study of Inductive Herb-Drug Interactions: Combining Pharmacophore and Docking-Based Rank Aggregation. BIOMED RESEARCH INTERNATIONAL 2015; 2015:657159. [PMID: 26339628 PMCID: PMC4538340 DOI: 10.1155/2015/657159] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 12/22/2014] [Accepted: 12/27/2014] [Indexed: 01/30/2023]
Abstract
The issue of herb-drug interactions has been widely reported. Herbal ingredients can activate nuclear receptors and further induce the gene expression alteration of drug-metabolizing enzyme and/or transporter. Therefore, the herb-drug interaction will happen when the herbs and drugs are coadministered. This kind of interaction is called inductive herb-drug interactions. Pregnane X Receptor (PXR) and drug-metabolizing target genes are involved in most of inductive herb-drug interactions. To predict this kind of herb-drug interaction, the protocol could be simplified to only screen agonists of PXR from herbs because the relations of drugs with their metabolizing enzymes are well studied. Here, a combinational in silico strategy of pharmacophore modelling and docking-based rank aggregation (DRA) was employed to identify PXR's agonists. Firstly, 305 ingredients were screened out from 820 ingredients as candidate agonists of PXR with our pharmacophore model. Secondly, DRA was used to rerank the result of pharmacophore filtering. To validate our prediction, a curated herb-drug interaction database was built, which recorded 380 herb-drug interactions. Finally, among the top 10 herb ingredients from the ranking list, 6 ingredients were reported to involve in herb-drug interactions. The accuracy of our method is higher than other traditional methods. The strategy could be extended to studies on other inductive herb-drug interactions.
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Detection of marine microalgal biotoxins using bioassays based on functional expression of tunicate xenobiotic receptors in yeast. Toxicon 2015; 95:13-22. [DOI: 10.1016/j.toxicon.2014.12.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 12/22/2014] [Accepted: 12/27/2014] [Indexed: 12/20/2022]
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Families of nuclear receptors in vertebrate models: characteristic and comparative toxicological perspective. Sci Rep 2015; 5:8554. [PMID: 25711679 PMCID: PMC4339804 DOI: 10.1038/srep08554] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 01/21/2015] [Indexed: 02/07/2023] Open
Abstract
Various synthetic chemicals are ligands for nuclear receptors (NRs) and can cause adverse effects in vertebrates mediated by NRs. While several model vertebrates, such as mouse, chicken, western clawed frog and zebrafish, are widely used in toxicity testing, few NRs have been well described for most of these classes. In this report, NRs in genomes of 12 vertebrates are characterized via bioinformatics approaches. Although numbers of NRs varied among species, with 40-42 genes in birds to 66-74 genes in teleost fishes, all NRs had clear homologs in human and could be categorized into seven subfamilies defined as NR0B-NR6A. Phylogenetic analysis revealed conservative evolutionary relationships for most NRs, which were consistent with traditional morphology-based systematics, except for some exceptions in Dolphin (Tursiops truncatus). Evolution of PXR and CAR exhibited unexpected multiple patterns and the existence of CAR possibly being traced back to ancient lobe-finned fishes and tetrapods (Sarcopterygii). Compared to the more conservative DBD of NRs, sequences of LBD were less conserved: Sequences of THRs, RARs and RXRs were ≥90% similar to those of the human, ERs, AR, GR, ERRs and PPARs were more variable with similarities of 60%-100% and PXR, CAR, DAX1 and SHP were least conserved among species.
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42
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Sharma D, Lau AJ, Sherman MA, Chang TKH. Differential activation of human constitutive androstane receptor and its SV23 and SV24 splice variants by rilpivirine and etravirine. Br J Pharmacol 2015; 172:1263-76. [PMID: 25363652 DOI: 10.1111/bph.12997] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 10/22/2014] [Accepted: 10/27/2014] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND AND PURPOSE Rilpivirine and etravirine are second-generation non-nucleoside reverse transcriptase inhibitors (NNRTIs) indicated for the treatment of HIV/AIDS. The constitutive androstane receptor (CAR) regulates the expression of genes involved in various biological processes, including the transport and biotransformation of drugs. We investigated the effect of rilpivirine and etravirine on the activity of the wild-type human CAR (hCAR-WT) and its hCAR-SV23 and hCAR-SV24 splice variants, and compared it with first-generation NNRTIs (efavirenz, nevirapine, and delavirdine). EXPERIMENTAL APPROACH Receptor activation, ligand-binding domain (LBD) transactivation, and co-activator recruitment were investigated in transiently transfected, NNRTI-treated HepG2 cells. Nuclear translocation of green fluorescent protein-tagged hCAR-WT and CYP2B6 gene expression were assessed in NNRTI-treated human hepatocytes. KEY RESULTS Rilpivirine and etravirine activated hCAR-WT, but not hCAR-SV23 or hCAR-SV24, and without transactivating the LBD or recruiting steroid receptor coactivators SRC-1, SRC-2, or SRC-3. Among the first-generation NNRTIs investigated, only efavirenz activated hCAR-WT, hCAR-SV23, and hCAR-SV24, but none of them transactivated the LBD of these receptors or substantively recruited SRC-1, SRC-2, or SRC-3. Rilpivirine, etravirine, and efavirenz triggered nuclear translocation of hCAR-WT and increased hCAR target gene (CYP2B6) expression. CONCLUSION AND IMPLICATIONS NNRTIs activate hCAR-WT, hCAR-SV23, and hCAR-SV24 in a drug-specific and isoform-selective manner. The activation occurs by a mechanism that does not appear to involve binding to the LBD or recruitment of SRC-1, SRC-2, or SRC-3.
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Affiliation(s)
- Devinder Sharma
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
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43
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Deciphering the roles of the constitutive androstane receptor in energy metabolism. Acta Pharmacol Sin 2015; 36:62-70. [PMID: 25500869 DOI: 10.1038/aps.2014.102] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 08/20/2014] [Indexed: 12/21/2022] Open
Abstract
The constitutive androstane receptor (CAR) is initially defined as a xenobiotic nuclear receptor that protects the liver from injury. Detoxification of damaging chemicals is achieved by CAR-mediated induction of drug-metabolizing enzymes and transporters. More recent research has implicated CAR in energy metabolism, suggesting a therapeutic potential for CAR in metabolic diseases, such as type 2 diabetes and obesity. A better understanding of the mechanisms by which CAR regulates energy metabolism will allow us to take advantage of its effectiveness while avoiding its side effects. This review summarizes the current progress on the regulation of CAR nuclear translocation, upstream modulators of CAR activity, and the crosstalk between CAR and other transcriptional factors, with the aim of elucidating how CAR regulates glucose and lipid metabolism.
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Richter I, Fidler AE. Marine invertebrate xenobiotic-activated nuclear receptors: their application as sensor elements in high-throughput bioassays for marine bioactive compounds. Mar Drugs 2014; 12:5590-618. [PMID: 25421319 PMCID: PMC4245547 DOI: 10.3390/md12115590] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Revised: 10/31/2014] [Accepted: 11/11/2014] [Indexed: 02/07/2023] Open
Abstract
Developing high-throughput assays to screen marine extracts for bioactive compounds presents both conceptual and technical challenges. One major challenge is to develop assays that have well-grounded ecological and evolutionary rationales. In this review we propose that a specific group of ligand-activated transcription factors are particularly well-suited to act as sensors in such bioassays. More specifically, xenobiotic-activated nuclear receptors (XANRs) regulate transcription of genes involved in xenobiotic detoxification. XANR ligand-binding domains (LBDs) may adaptively evolve to bind those bioactive, and potentially toxic, compounds to which organisms are normally exposed to through their specific diets. A brief overview of the function and taxonomic distribution of both vertebrate and invertebrate XANRs is first provided. Proof-of-concept experiments are then described which confirm that a filter-feeding marine invertebrate XANR LBD is activated by marine bioactive compounds. We speculate that increasing access to marine invertebrate genome sequence data, in combination with the expression of functional recombinant marine invertebrate XANR LBDs, will facilitate the generation of high-throughput bioassays/biosensors of widely differing specificities, but all based on activation of XANR LBDs. Such assays may find application in screening marine extracts for bioactive compounds that could act as drug lead compounds.
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Affiliation(s)
- Ingrid Richter
- Environmental Technology Group, Cawthron Institute, Private Bag 2, Nelson 7012, New Zealand.
| | - Andrew E Fidler
- Environmental Technology Group, Cawthron Institute, Private Bag 2, Nelson 7012, New Zealand.
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45
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Witt KA, Sandoval KE. Steroids and the blood-brain barrier: therapeutic implications. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2014; 71:361-390. [PMID: 25307223 DOI: 10.1016/bs.apha.2014.06.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Steroids have a wide spectrum of impact, serving as fundamental regulators of nearly every physiological process within the human body. Therapeutic applications of steroids are equally broad, with a diverse range of medications and targets. Within the central nervous system (CNS), steroids influence development, memory, behavior, and disease outcomes. Moreover, steroids are well recognized as to their impact on the vascular endothelium. The blood-brain barrier (BBB) at the level of the brain microvascular endothelium serves as the principle interface between the peripheral circulation and the brain. Steroids have been identified to impact several critical properties of the BBB, including cellular efflux mechanisms, nutrient uptake, and tight junction integrity. Such actions not only influence brain homeostasis but also the delivery of CNS-targeted therapeutics. A greater understanding of the respective steroid-BBB interactions may shed further light on the differential treatment outcomes observed across CNS pathologies. In this chapter, we examine the current therapeutic implications of steroids respective to BBB structure and function, with emphasis on glucocorticoids and estrogens.
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Affiliation(s)
- Ken A Witt
- Pharmaceutical Sciences, School of Pharmacy, Southern Illinois University, Edwardsville, Illinois, USA.
| | - Karin E Sandoval
- Pharmaceutical Sciences, School of Pharmacy, Southern Illinois University, Edwardsville, Illinois, USA
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Marine and semi-synthetic hydroxysteroids as new scaffolds for pregnane X receptor modulation. Mar Drugs 2014; 12:3091-115. [PMID: 24871460 PMCID: PMC4071567 DOI: 10.3390/md12063091] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 04/29/2014] [Accepted: 04/30/2014] [Indexed: 12/16/2022] Open
Abstract
In recent years many sterols with unusual structures and promising biological profiles have been identified from marine sources. Here we report the isolation of a series of 24-alkylated-hydroxysteroids from the soft coral Sinularia kavarattiensis, acting as pregnane X receptor (PXR) modulators. Starting from this scaffold a number of derivatives were prepared and evaluated for their ability to activate the PXR by assessing transactivation and quantifying gene expression. Our study reveals that ergost-5-en-3β-ol (4) induces PXR transactivation in HepG2 cells and stimulates the expression of the PXR target gene CYP3A4. To shed light on the molecular basis of the interaction between these ligands and PXR, we investigated, through docking simulations, the binding mechanism of the most potent compound of the series, 4, to the PXR. Our findings provide useful functional and structural information to guide further investigations and drug design.
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47
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Abstract
The pregnane X receptor (PXR) and constitutive androstane receptor (CAR), 2 closely related and liver-enriched members of the nuclear receptor superfamily, and aryl hydrocarbon receptor (AhR), a nonnuclear receptor transcription factor (TF), are major receptors/TFs regulating the expression of genes for the clearance and detoxification of xenobiotics. They are hence defined as "xenobiotic receptors". Recent studies have demonstrated that PXR, CAR and AhR also regulate the expression of key proteins involved in endobiotic responses such as the metabolic homeostasis of lipids, glucose, and bile acid, and inflammatory processes. It is suggested that the functions of PXR, CAR and AhR may be closely implicated in the pathogeneses of metabolic vascular diseases, such as hyperlipidemia, atherogenesis, and hypertension. Therefore, manipulation of the activities of these receptors may provide novel strategies for the treatment of vascular diseases. Here, we review the pathophysiological roles of PXR, CAR and AhR in the vascular system.
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Affiliation(s)
- Lei Xiao
- Cardiovascular Research Center, School of Medicine, Xi'an Jiaotong University
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48
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Rasmussen MK, Klausen CL, Ekstrand B. Regulation of cytochrome P450 mRNA expression in primary porcine hepatocytes by selected secondary plant metabolites from chicory (Cichorium intybus L.). Food Chem 2014; 146:255-63. [PMID: 24176340 DOI: 10.1016/j.foodchem.2013.09.068] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 07/04/2013] [Accepted: 09/11/2013] [Indexed: 12/12/2022]
Abstract
Chicory (Cichorium intybus) has been shown to induce enzymes of pharmacokinetic relevance (cytochrome P450; CYP). The aim of this study was to investigate the effects of selected secondary plant metabolites with a global extract of chicory root, on the expression of hepatic CYP mRNA (1A2, 2A19, 2C33, 2D25, 2E1 and 3A29), using primary porcine hepatocytes. Of the tested secondary plant metabolites, artemisinin, scoparone, lactucin and esculetin all induced increased expression of specific CYPs, while esculin showed no effect. In contrast, a global extract of chicory root decreased the expression of CYP1A2, 2C33, 2D25 and 3A29 at high concentrations. The results suggest that purified secondary metabolites from chicory affect CYP expression and thereby might affect detoxification in general, and that global extracts of plants can have effects different from individual components.
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49
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Rasmussen MK, Ekstrand B. Regulation of 3β-hydroxysteroid dehydrogenase and sulphotransferase 2A1 gene expression in primary porcine hepatocytes by selected sex-steroids and plant secondary metabolites from chicory (Cichorium intybus L.) and wormwood (Artemisia sp.). Gene 2014; 536:53-8. [PMID: 24333270 DOI: 10.1016/j.gene.2013.11.092] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 11/30/2013] [Indexed: 12/15/2022]
Abstract
In pigs the endogenously produced compound androstenone is metabolised in the liver in two steps by 3β-hydroxysteroid dehydrogenase (3β-HSD) and sulphotransferase 2A1 (SULT2A1). The present study investigated the effect of selected sex-steroids (0.01-1 μM androstenone, testosterone and estradiol), skatole (1-100 μM) and secondary plant metabolites (1-100 μM) on the expression of 3β-HSD and SULT2A1 mRNA. Additionally the effect of a global methanolic extract of dried chicory root was investigated and compared to previous obtained in vivo effects. Primary hepatocytes were isolated from the livers of piglets (crossbreed: Landrace×Yorkshire and Duroc) and cultured for 24h before treatment for an additionally 24h. RNA was isolated from the hepatocytes and specific gene expression determined by RT-PCR using TaqMan probes. The investigated sex-steroids had no effect on the mRNA expression of 3β-HSD and SULT2A1, while skatole decreased the content of SULT2A1 30% compared to control. Of the investigated secondary plant metabolites artemisinin and scoparone (found in Artemisia sp.) lowered the content of SULT2A1 by 20 and 30% compared to control, respectively. Moreover, we tested three secondary plant metabolites (lactucin, esculetin and esculin) found in chicory root. Lactucin increased the mRNA content of both 3β-HSD and SULT2A1 by 200% compared to control. An extract of chicory root was shown to decrease the expression of both 3β-HSD and SULT2A1. It is concluded that the gene expression of enzymes with importance for androstenone metabolism is regulated by secondary plant metabolites in a complex manner.
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Affiliation(s)
| | - Bo Ekstrand
- Department of Food Science, Aarhus University, Denmark
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50
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Hukkanen J. Induction of cytochrome P450 enzymes: a view on humanin vivofindings. Expert Rev Clin Pharmacol 2014; 5:569-85. [PMID: 23121279 DOI: 10.1586/ecp.12.39] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Janne Hukkanen
- Department of Internal Medicine, Institute of Clinical Medicine, and Biocenter Oulu, University of Oulu, Oulu, Finland.
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