1
|
Nieves KM, Hirota SA, Flannigan KL. Xenobiotic receptors and the regulation of intestinal homeostasis: harnessing the chemical output of the intestinal microbiota. Am J Physiol Gastrointest Liver Physiol 2022; 322:G268-G281. [PMID: 34941453 DOI: 10.1152/ajpgi.00160.2021] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The commensal bacteria that reside in the gastrointestinal tract exist in a symbiotic relationship with the host, driving the development of the immune system and maintaining metabolic and tissue homeostasis in the local environment. The intestinal microbiota has the capacity to generate a wide array of chemical metabolites to which the cells of the intestinal mucosa are exposed. Host cells express xenobiotic receptors, such as the aryl hydrocarbon receptor (AhR) and the pregnane X receptor (PXR), that can sense and respond to chemicals that are generated by nonhost pathways. In this review, we outline the physiological and immunological processes within the intestinal environment that are regulated by microbial metabolites through the activation of the AhR and the PXR, with a focus on ligands generated by the stepwise catabolism of tryptophan.
Collapse
Affiliation(s)
- Kristoff M Nieves
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Simon A Hirota
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Disease, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Kyle L Flannigan
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| |
Collapse
|
2
|
Implication of Intestinal Barrier Dysfunction in Gut Dysbiosis and Diseases. Biomedicines 2022; 10:biomedicines10020289. [PMID: 35203499 PMCID: PMC8869546 DOI: 10.3390/biomedicines10020289] [Citation(s) in RCA: 80] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 01/21/2022] [Accepted: 01/24/2022] [Indexed: 02/04/2023] Open
Abstract
The intestinal mucosal barrier, also referred to as intestinal barrier, is widely recognized as a critical player in gut homeostasis maintenance as it ensures the complex crosstalk between gut microbes (both commensals and pathogens) and the host immune system. Highly specialized epithelial cells constantly cope with several protective and harmful agents to maintain the multiple physiological functions of the barrier as well as its integrity. However, both genetic defects and environmental factors can break such equilibrium, thus promoting gut dysbiosis, dysregulated immune-inflammatory responses, and even the development of chronic pathological conditions. Here, we review and discuss the molecular and cellular pathways underlying intestinal barrier structural and functional homeostasis, focusing on potential alterations that may undermine this fine balance.
Collapse
|
3
|
High Pregnane X Receptor (PXR) Expression Is Correlated with Poor Prognosis in Invasive Breast Carcinoma. Diagnostics (Basel) 2021; 11:diagnostics11111946. [PMID: 34829293 PMCID: PMC8624096 DOI: 10.3390/diagnostics11111946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 10/12/2021] [Accepted: 10/15/2021] [Indexed: 11/16/2022] Open
Abstract
Pregnane X Receptor (PXR) is involved in human cancer, either by directly affecting carcinogenesis or by inducing drug-drug interactions and chemotherapy resistance. The clinical significance of PXR expression in invasive breast carcinoma was evaluated in the present study. PXR protein expression was assessed immunohistochemically on formalin fixed paraffin-embedded breast invasive carcinoma tissue sections, obtained from 148 patients, and was correlated with clinicopathological parameters, molecular phenotypes, tumor cells' proliferative capacity, and overall disease-free patients' survival. Additionally, the expression of PXR was examined on human breast carcinoma cell lines of different histological grade, hormonal status, and metastatic potential. PXR positivity was noted in 79 (53.4%) and high PXR expression in 48 (32.4%), out of 148 breast carcinoma cases. High PXR expression was positively associated with nuclear grade (p = 0.0112) and histological grade of differentiation (p = 0.0305), as well as with tumor cells' proliferative capacity (p = 0.0051), and negatively with luminal A subtype (p = 0.0295). Associations between high PXR expression, estrogen, and progesterone receptor negative status were also recorded (p = 0.0314 and p = 0.0208, respectively). High PXR expression was associated with shorter overall patients' survival times (log-rank test, p = 0.0009). In multivariate analysis, high PXR expression was identified as an independent prognostic factor of overall patients' survival (Cox-regression analysis, p = 0.0082). PXR expression alterations were also noted in breast cancer cell lines of different hormonal status. The present data supported evidence that PXR was related to a more aggressive invasive breast carcinoma phenotype, being a strong and independent poor prognosticator.
Collapse
|
4
|
Yang M, Gu Y, Li L, Liu T, Song X, Sun Y, Cao X, Wang B, Jiang K, Cao H. Bile Acid-Gut Microbiota Axis in Inflammatory Bowel Disease: From Bench to Bedside. Nutrients 2021; 13:nu13093143. [PMID: 34579027 PMCID: PMC8467364 DOI: 10.3390/nu13093143] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 08/29/2021] [Accepted: 08/30/2021] [Indexed: 12/13/2022] Open
Abstract
Inflammatory bowel disease (IBD) is a chronic, relapsing inflammatory disorder of the gastrointestinal tract, with increasing prevalence, and its pathogenesis remains unclear. Accumulating evidence suggested that gut microbiota and bile acids play pivotal roles in intestinal homeostasis and inflammation. Patients with IBD exhibit decreased microbial diversity and abnormal microbial composition marked by the depletion of phylum Firmicutes (including bacteria involved in bile acid metabolism) and the enrichment of phylum Proteobacteria. Dysbiosis leads to blocked bile acid transformation. Thus, the concentration of primary and conjugated bile acids is elevated at the expense of secondary bile acids in IBD. In turn, bile acids could modulate the microbial community. Gut dysbiosis and disturbed bile acids impair the gut barrier and immunity. Several therapies, such as diets, probiotics, prebiotics, engineered bacteria, fecal microbiota transplantation and ursodeoxycholic acid, may alleviate IBD by restoring gut microbiota and bile acids. Thus, the bile acid–gut microbiota axis is closely connected with IBD pathogenesis. Regulation of this axis may be a novel option for treating IBD.
Collapse
Affiliation(s)
- Min Yang
- Department of Gastroenterology and Hepatology, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin Medical University General Hospital, Tianjin 300052, China; (M.Y.); (Y.G.); (L.L.); (T.L.); (X.S.); (Y.S.); (X.C.); (B.W.)
| | - Yu Gu
- Department of Gastroenterology and Hepatology, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin Medical University General Hospital, Tianjin 300052, China; (M.Y.); (Y.G.); (L.L.); (T.L.); (X.S.); (Y.S.); (X.C.); (B.W.)
| | - Lingfeng Li
- Department of Gastroenterology and Hepatology, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin Medical University General Hospital, Tianjin 300052, China; (M.Y.); (Y.G.); (L.L.); (T.L.); (X.S.); (Y.S.); (X.C.); (B.W.)
| | - Tianyu Liu
- Department of Gastroenterology and Hepatology, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin Medical University General Hospital, Tianjin 300052, China; (M.Y.); (Y.G.); (L.L.); (T.L.); (X.S.); (Y.S.); (X.C.); (B.W.)
| | - Xueli Song
- Department of Gastroenterology and Hepatology, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin Medical University General Hospital, Tianjin 300052, China; (M.Y.); (Y.G.); (L.L.); (T.L.); (X.S.); (Y.S.); (X.C.); (B.W.)
| | - Yue Sun
- Department of Gastroenterology and Hepatology, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin Medical University General Hospital, Tianjin 300052, China; (M.Y.); (Y.G.); (L.L.); (T.L.); (X.S.); (Y.S.); (X.C.); (B.W.)
| | - Xiaocang Cao
- Department of Gastroenterology and Hepatology, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin Medical University General Hospital, Tianjin 300052, China; (M.Y.); (Y.G.); (L.L.); (T.L.); (X.S.); (Y.S.); (X.C.); (B.W.)
| | - Bangmao Wang
- Department of Gastroenterology and Hepatology, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin Medical University General Hospital, Tianjin 300052, China; (M.Y.); (Y.G.); (L.L.); (T.L.); (X.S.); (Y.S.); (X.C.); (B.W.)
| | - Kui Jiang
- Graduate School of Tianjin Medical University, Tianjin 300070, China
- Correspondence: (K.J.); (H.C.)
| | - Hailong Cao
- Department of Gastroenterology and Hepatology, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin Medical University General Hospital, Tianjin 300052, China; (M.Y.); (Y.G.); (L.L.); (T.L.); (X.S.); (Y.S.); (X.C.); (B.W.)
- Correspondence: (K.J.); (H.C.)
| |
Collapse
|
5
|
Genetic variation in the farnesoid X-receptor predicts Crohn's disease severity in female patients. Sci Rep 2020; 10:11725. [PMID: 32678214 PMCID: PMC7366697 DOI: 10.1038/s41598-020-68686-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 06/26/2020] [Indexed: 12/13/2022] Open
Abstract
The farnesoid X receptor (FXR) is implicated in Crohn's disease (CD) pathogenesis. It is unclear how genetic variation in FXR impacts CD severity versus genetic variation in nuclear receptors such as pregnane X receptor (PXR) and the multi-drug resistance protein 1 (MDR1, ABCB1). To evaluate FXR-1G > T as a genomic biomarker of severity in CD and propose a plausible molecular mechanism. A retrospective study (n = 542) was conducted in a Canadian cohort of CD patients. Genotypic analysis (FXR-1G > T, MDR1 3435C > T and PXR -25385C > T) as well as determination of the FXR downstream product, fibroblast growth factor (FGF) 19 was performed. Primary outcomes included risk and time to first CD-related surgery. The effect of estrogen on wild type and variant FXR activity was assessed in HepG2 cells. The FXR-1GT genotype was associated with the risk of (odds ratio, OR = 3.34, 95% CI = 1.58–7.05, p = 0.002) and earlier progression to surgery (hazard ratio, HR = 3.00, 95% CI = 1.86–4.83, p < 0.0001) in CD. Female carriers of the FXR-1GT genotype had the greatest risk of surgery (OR = 14.87 95% CI = 4.22–52.38, p < 0.0001) and early progression to surgery (HR = 6.28, 95% CI = 3.62–10.90, p < 0.0001). Women carriers of FXR-1GT polymorphism had a three-fold lower FGF19 plasma concentration versus women with FXR-1GG genotype (p < 0.0001). In HepG2 cells cotransfected with estrogen receptor (ER) and FXR, presence of estradiol further attenuated variant FXR activity. MDR1 and PXR genotypes were not associated with surgical risk. Unlike MDR1 and PXR, FXR-1GT genetic variation is associated with earlier and more frequent surgery in women with CD. This may be through ER-mediated attenuation of FXR activation.
Collapse
|
6
|
Liu T, Song X, Khan S, Li Y, Guo Z, Li C, Wang S, Dong W, Liu W, Wang B, Cao H. The gut microbiota at the intersection of bile acids and intestinal carcinogenesis: An old story, yet mesmerizing. Int J Cancer 2019; 146:1780-1790. [DOI: 10.1002/ijc.32563] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 07/05/2019] [Indexed: 12/24/2022]
Affiliation(s)
- Tianyu Liu
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| | - Xueli Song
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| | - Samiullah Khan
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| | - Yun Li
- Department of Pharmacy, General HospitalTianjin Medical University Tianjin China
| | - Zixuan Guo
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| | - Chuqiao Li
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| | - Sinan Wang
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| | - Wenxiao Dong
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| | - Wentian Liu
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| | - Bangmao Wang
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| | - Hailong Cao
- Department of Gastroenterology and Hepatology, General HospitalTianjin Medical University Tianjin China
| |
Collapse
|
7
|
Zhang C, Guo W, Cheng Y, Li Q, Yang X, Dai R, Zhu L, Chen W. Genetic analysis of pharmacogenomic VIP variants in the Blang population from Yunnan Province of China. Mol Genet Genomic Med 2019; 7:e574. [PMID: 30955239 PMCID: PMC6503013 DOI: 10.1002/mgg3.574] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 11/01/2018] [Accepted: 12/31/2018] [Indexed: 11/08/2022] Open
Abstract
Background Genetic polymorphisms in numerous pharmacogenetics studies were regarded as the essential factors involved in the response to or metabolism of drugs. These genetic variants called very important pharmacogenetic (VIP) variants played a role in drugs metabolism, which have been summarized in the PharmGKB database. In this study, we genotyped 80 VIP variants from the PharmGKB in 100 members of Blang volunteers from Yunnan province. Methods Based on the PharmGKB database, we genotyped 80 VIP variants loci located in 47 genes. We used χ2 tests to evaluate the significant loci between Blang and the other populations, including ASW, CEU, CHB, CHD, GIH, JPT, LWK, MEX, MKK, TSI, and YRI. The global variation distribution of the significant variants was observed from the ALlele FREquency Database. And then, we used F‐statistics (Fst), genetic structure, and phylogenetic tree analyses to ascertain the genetic affinity among 12 populations. Results Comparing the Blang with the other 11 populations from the HapMap Project, the statistical results revealed that rs3814055 (NC_000003.12:g.119781188C>T) of nuclear receptor subfamily 1 group I member 2 (NR1I2, OMIM# 603,065) was the most significant variant, followed by rs1540339 (NC_000012.12:g.47863543C>T) of vitamin D receptor (VDR, OMIM#601,769). Furthermore, we found that genotype frequency of rs3814055 in the Blang was closer to the populations distributed in Miao. And genetic structure and F‐statistics indicated that the Blangs had a relatively closer affinity with CHD, CHB, and JPT populations. In addition, the Han nationality in Shaanxi was closer to it. Conclusions Our results will complement the pharmacogenomics information of the Blang ethnic group and provide a theoretical basis for safer drug administration for Blang.
Collapse
Affiliation(s)
- Chan Zhang
- Department of Blood Transfusion, The First People's Hospital of Yunnan Province, The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Weiwei Guo
- Department of State-owned Assets Management, The First People's Hospital of Yunnan Province, The Affiliated Hospital of Kunming University of Science and Technology, Kunming, China
| | - Yujing Cheng
- Department of Blood Transfusion, The First People's Hospital of Yunnan Province, The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Qi Li
- Department of Blood Transfusion, The First People's Hospital of Yunnan Province, The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Xin Yang
- Department of Blood Transfusion, The First People's Hospital of Yunnan Province, The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Run Dai
- Department of Blood Transfusion, The First People's Hospital of Yunnan Province, The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Linhao Zhu
- Key Laboratory of Molecular Mechanism and Intervention Research for Plateau Diseases of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang, Shaanxi, China.,Key Laboratory of High Altitude Environment and Genes Related to Diseases of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang, Shaanxi, China.,Key Laboratory for Basic Life Science Research of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang, Shaanxi, China
| | - Wanlu Chen
- Department of Blood Transfusion, The First People's Hospital of Yunnan Province, The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| |
Collapse
|
8
|
Nuclear Receptors in the Pathogenesis and Management of Inflammatory Bowel Disease. Mediators Inflamm 2019; 2019:2624941. [PMID: 30804707 PMCID: PMC6360586 DOI: 10.1155/2019/2624941] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 12/01/2018] [Accepted: 12/23/2018] [Indexed: 12/12/2022] Open
Abstract
Nuclear receptors (NRs) are ligand-dependent transcription factors that regulate the transcription of target genes. Previous epidemiological and genetic studies have documented the association of NRs with the risk of inflammatory bowel disease (IBD). Although the mechanisms of action of NRs in IBD have not been fully established, accumulating evidence has demonstrated that NRs play complicated roles in regulating intestinal immunity, mucosal barriers, and intestinal flora. As one of the first-line medications for the treatment of IBD, 5-aminosalicylic acid (5-ASA) activates peroxisome proliferator-activated receptor gamma (PPARγ) to attenuate colitis. The protective roles of rifaximin and rifampicin partly depend on promoting pregnane X receptor (PXR) expression. The aims of this review are to discuss the roles of several important NRs, such as PPARγ, PXR, vitamin D receptor (VDR), farnesoid X receptor (FXR), and RAR-related orphan receptor gammat (RORγt), in the pathogenesis of IBD and management strategies based on targeting these receptors.
Collapse
|
9
|
Mohandas S, Vairappan B. Role of pregnane X-receptor in regulating bacterial translocation in chronic liver diseases. World J Hepatol 2017; 9:1210-1226. [PMID: 29184608 PMCID: PMC5696604 DOI: 10.4254/wjh.v9.i32.1210] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 10/23/2017] [Accepted: 10/30/2017] [Indexed: 02/06/2023] Open
Abstract
Bacterial translocation (BT) has been impeccably implicated as a driving factor in the pathogenesis of a spectrum of chronic liver diseases (CLD). Scientific evidence accumulated over the last four decades has implied that the disease pathologies in CLD and BT are connected as a loop in the gut-liver axis and exacerbate each other. Pregnane X receptor (PXR) is a ligand-activated transcription factor and nuclear receptor that is expressed ubiquitously along the gut-liver-axis. PXR has been intricately associated with the regulation of various mechanisms attributed in causing BT. The importance of PXR as the mechanistic linker molecule in the gut-liver axis and its role in regulating bacterial interactions with the host in CLD has not been explored. PubMed was used to perform an extensive literature search using the keywords PXR and bacterial translocation, PXR and chronic liver disease including cirrhosis. In an adequate expression state, PXR acts as a sensor for bile acid dysregulation and bacterial derived metabolites, and in response shapes the immune profile beneficial to the host. Activation of PXR could be therapeutic in CLD as it counter-regulates endotoxin mediated inflammation and maintains the integrity of intestinal epithelium. This review mainly focuses PXR function and its regulation in BT in the context of chronic liver diseases.
Collapse
Affiliation(s)
- Sundhar Mohandas
- Liver Diseases Research Lab, Department of Biochemistry, Jawaharlal Institute of Postgraduate Medical Education and Research, Dhanvantari Nagar, Pondicherry 605006, India
| | - Balasubramaniyan Vairappan
- Liver Diseases Research Lab, Department of Biochemistry, Jawaharlal Institute of Postgraduate Medical Education and Research, Dhanvantari Nagar, Pondicherry 605006, India
| |
Collapse
|
10
|
Choi S, Neequaye P, French SW, Gonzalez FJ, Gyamfi MA. Pregnane X receptor promotes ethanol-induced hepatosteatosis in mice. J Biol Chem 2017; 293:1-17. [PMID: 29123032 DOI: 10.1074/jbc.m117.815217] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 11/02/2017] [Indexed: 12/15/2022] Open
Abstract
The pregnane X receptor (PXR, NR1I2) is a xenobiotic-sensing nuclear receptor that modulates the metabolic response to drugs and toxic agents. Both PXR activation and deficiency promote hepatic triglyceride accumulation, a hallmark feature of alcoholic liver disease. However, the molecular mechanism of PXR-mediated activation of ethanol (EtOH)-induced steatosis is unclear. Here, using male wildtype (WT) and Pxr-null mice, we examined PXR-mediated regulation of chronic EtOH-induced hepatic lipid accumulation and hepatotoxicity. EtOH ingestion for 8 weeks significantly (1.8-fold) up-regulated Pxr mRNA levels in WT mice. The EtOH exposure also increased mRNAs encoding hepatic constitutive androstane receptor (3-fold) and its target, Cyp2b10 (220-fold), in a PXR-dependent manner. Furthermore, WT mice had higher serum EtOH levels and developed hepatic steatosis characterized by micro- and macrovesicular lipid accumulation. Consistent with the development of steatosis, lipogenic gene induction was significantly increased in WT mice, including sterol regulatory element-binding protein 1c target gene fatty-acid synthase (3.0-fold), early growth response-1 (3.2-fold), and TNFα (3.0-fold), whereas the expression of peroxisome proliferator-activated receptor α target genes was suppressed. Of note, PXR deficiency suppressed these changes and steatosis. Protein levels, but not mRNAs levels, of EtOH-metabolizing enzymes, including alcohol dehydrogenase 1, aldehyde dehydrogenase 1A1, and catalase, as well as the microsomal triglyceride transfer protein, involved in regulating lipid output were higher in Pxr-null than in WT mice. These findings establish that PXR signaling contributes to ALD development and suggest that PXR antagonists may provide a new approach for ALD therapy.
Collapse
Affiliation(s)
- Sora Choi
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, North Carolina 27707
| | - Prince Neequaye
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, North Carolina 27707
| | - Samuel W French
- Department of Pathology, Harbor-UCLA Medical Center, Torrance, California 90509
| | - Frank J Gonzalez
- Laboratory of Metabolism, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | - Maxwell A Gyamfi
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, North Carolina 27707.
| |
Collapse
|
11
|
Medeiros RMD, Menti CF, Benelli JL, Matte MCC, Melo MGD, Almeida SEDM, Fiegenbaum M. Association of NR1I2 gene polymorphisms and time of progression to AIDS. Mem Inst Oswaldo Cruz 2017; 112:269-274. [PMID: 28327790 PMCID: PMC5354613 DOI: 10.1590/0074-02760160382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 12/27/2016] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND The time of progression towards AIDS can vary greatly among seropositive patients, and may be associated with host genetic variation. The NR1I2 (PXR) gene, a ligand-activated transcription factor, regulates the transcription immune pathway genes and can therefore be targets of viral replication mechanisms influencing time of progression to AIDS. OBJECTIVE To verify the association of single nucleotide polymorphisms (SNPs) rs3814057, rs6785049, rs7643645, and rs2461817 in the NR1I2 (PXR) gene with progression to AIDS in HIV-1 infected patients. METHODS Blood samples were obtained from 96 HIV-1 positive individuals following informed consent. DNA was isolated and genotyped through real time polymerase chain reaction (PCR) for the presence of SNPs in the NR1I2. Questionnaires on socio-demographic features and behaviors were answered and time of progression to AIDS was estimated based on medical chart analysis. FINDINGS Patients with the GG genotype for rs7643645 were shown to be related with a more rapid disease progression when compared to GA and AA genotypes. This result was maintained by the Multivariate Cox Regression considering sex, ethnicity, and presence of HLA-B*57, HLA-B*27, and CCR5del32 polymorphisms. MAIN CONCLUSIONS Recent studies reported the expression of the nuclear receptors in T-Lymphocytes, suggesting their possible role in the immune response. In addition, nuclear receptors have been shown to inhibit the HIV replication, although no such mechanism has been thoroughly elucidated to date. This is the first time an association between NR1I2 polymorphism and time of progression to AIDS is reported and supports an apparent relationship between the gene in the immune response and identifies another genetic factor influencing AIDS progression.
Collapse
Affiliation(s)
- Rúbia Marília de Medeiros
- Fundação Estadual de Produção e Pesquisa, Centro de Desenvolvimento Científico e Tecnológicos, Porto Alegre, RS, Brasil.,Universidade Federal do Rio Grande do Sul, Programa de Pós-Graduação em Genética e Biologia Molecular, Porto Alegre, RS, Brasil
| | - Carolina Fialho Menti
- Universidade Federal de Ciências da Saúde de Porto Alegre, Faculdade de Biomedicina, Porto Alegre, RS, Brasil
| | - Jéssica Louise Benelli
- Universidade Federal de Ciências da Saúde de Porto Alegre, Programa de Pós-Graduação em Patologia, Porto Alegre, RS, Brasil
| | - Maria Cristina Cotta Matte
- Fundação Estadual de Produção e Pesquisa, Centro de Desenvolvimento Científico e Tecnológicos, Porto Alegre, RS, Brasil.,Universidade Federal do Rio Grande do Sul, Programa de Pós-Graduação em Genética e Biologia Molecular, Porto Alegre, RS, Brasil
| | | | - Sabrina Esteves de Matos Almeida
- Fundação Estadual de Produção e Pesquisa, Centro de Desenvolvimento Científico e Tecnológicos, Porto Alegre, RS, Brasil.,Universidade Federal do Rio Grande do Sul, Programa de Pós-Graduação em Genética e Biologia Molecular, Porto Alegre, RS, Brasil.,Universidade Feevale, Novo Hamburgo, Brasil
| | - Marilu Fiegenbaum
- Universidade Federal de Ciências da Saúde de Porto Alegre, Programa de Pós-Graduação em Patologia, Porto Alegre, RS, Brasil
| |
Collapse
|
12
|
Guo X, Yan M. Pregnane X Receptor Polymorphisms and Risk of Inflammatory Bowel Disease: A Meta-Analysis. Immunol Invest 2017; 46:566-576. [PMID: 28742404 DOI: 10.1080/08820139.2017.1322101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Xiaolan Guo
- Department of Hepatology and Gastroenterology, Qilu Hospital of Shandong University, Jinan, Shandong, People’s Republic of China
| | - Ming Yan
- Department of Hepatology and Gastroenterology, Qilu Hospital of Shandong University, Jinan, Shandong, People’s Republic of China
- Department of Geriatric Gastroenterology, Qilu Hospital of Shandong University, Jinan, Shandong, People’s Republic of China
| |
Collapse
|
13
|
Ding YP, Ladeiro Y, Morilla I, Bouhnik Y, Marah A, Zaag H, Cazals-Hatem D, Seksik P, Daniel F, Hugot JP, Wainrib G, Tréton X, Ogier-Denis E. Integrative Network-based Analysis of Colonic Detoxification Gene Expression in Ulcerative Colitis According to Smoking Status. J Crohns Colitis 2017; 11:474-484. [PMID: 27702825 DOI: 10.1093/ecco-jcc/jjw179] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 10/03/2016] [Indexed: 02/08/2023]
Abstract
BACKGROUNDS AND AIMS The effect of cigarette smoking [CS] is ambivalent since smoking improves ulcerative colitis [UC] while it worsens Crohn's disease [CD]. Although this clinical relationship between inflammatory bowel disease [IBD] and tobacco is well established, only a few experimental works have investigated the effect of smoking on the colonic barrier homeostasis focusing on xenobiotic detoxification genes. METHODS A comprehensive and integrated comparative analysis of the global xenobiotic detoxification capacity of the normal colonic mucosa of healthy smokers [n = 8] and non-smokers [n = 9] versus the non-affected colonic mucosa of UC patients [n = 19] was performed by quantitative real-time polymerase chain reaction [qRT PCR]. The detoxification gene expression profile was analysed in CD patients [n = 18], in smoking UC patients [n = 5], and in biopsies from non-smoking UC patients cultured or not with cigarette smoke extract [n = 8]. RESULTS Of the 244 detoxification genes investigated, 65 were dysregulated in UC patients in comparison with healthy controls or CD patients. The expression of ≥ 45/65 genes was inversed by CS in biopsies of smoking UC patients in remission and in colonic explants of UC patients exposed to cigarette smoke extract. We devised a network-based data analysis approach for differentially assessing changes in genetic interactions, allowing identification of unexpected regulatory detoxification genes that may play a major role in the beneficial effect of smoking on UC. CONCLUSIONS Non-inflamed colonic mucosa in UC is characterised by a specifically altered detoxification gene network, which is partially restored by tobacco. These mucosal signatures could be useful for developing new therapeutic strategies and biomarkers of drug response in UC.
Collapse
Affiliation(s)
- Yong-Ping Ding
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France
| | - Yannick Ladeiro
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France
| | - Ian Morilla
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France.,Université Paris 13, Sorbonne Paris Cité, Villetaneuse, France
| | - Yoram Bouhnik
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France.,Assistance Publique Hôpitaux de Paris, Service de gastroentérologie, MICI et assistance nutritive, Hôpital Beaujon, Clichy la Garenne, France
| | - Assiya Marah
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France
| | - Hatem Zaag
- Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France.,Université Paris 13, Sorbonne Paris Cité, Villetaneuse, France
| | - Dominique Cazals-Hatem
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France.,Assistance Publique Hôpitaux de Paris, Service d'anatomopathologie, Hôpital Beaujon, Clichy la Garenne, France
| | - Philippe Seksik
- INSERM U1157, UMR 7203, F-7502, Paris, France.,Assistance Publique Hôpitaux de Paris, Hôpital Saint-Antoine, Paris, France
| | - Fanny Daniel
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France
| | - Jean-Pierre Hugot
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France.,Assistance Publique Hôpitaux de Paris, Hôpital Robert Debré, Paris, France
| | - Gilles Wainrib
- Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France.,Département d'Informatique, Equipe DATA, Ecole Normale Supérieure, Paris, France
| | - Xavier Tréton
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France.,Assistance Publique Hôpitaux de Paris, Service de gastroentérologie, MICI et assistance nutritive, Hôpital Beaujon, Clichy la Garenne, France
| | - Eric Ogier-Denis
- INSERM, Research Centre of Inflammation BP 416, Paris, France.,Université Paris-Diderot Sorbonne Paris-Cité, Paris, France.,Laboratory of Excellence Labex INFLAMEX, Sorbonne-Paris- Cité, Paris, France
| |
Collapse
|
14
|
Rana M, Coshic P, Goswami R, Tyagi RK. Influence of a critical single nucleotide polymorphism on nuclear receptor PXR-promoter function. Cell Biol Int 2017; 41:570-576. [DOI: 10.1002/cbin.10744] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 02/13/2017] [Indexed: 12/12/2022]
Affiliation(s)
- Manjul Rana
- Special Centre for Molecular Medicine; Jawaharlal Nehru University; New Delhi 110067 India
| | - Poonam Coshic
- Department of Transfusion Medicine; All India Institute of Medical Sciences; New Delhi 110029 India
| | - Ravinder Goswami
- Department of Endocrinology and Metabolism; All India Institute of Medical Sciences; New Delhi 110029 India
| | - Rakesh K. Tyagi
- Special Centre for Molecular Medicine; Jawaharlal Nehru University; New Delhi 110067 India
| |
Collapse
|
15
|
Sun MY, Lin JN. Relationship between NR1I2 polymorphisms and inflammatory bowel disease risk: A systematic review and meta-analysis. Clin Res Hepatol Gastroenterol 2017; 41:230-239. [PMID: 27894906 DOI: 10.1016/j.clinre.2016.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 09/21/2016] [Accepted: 10/18/2016] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND OBJECTIVE Inconsistent results regarding an association between polymorphisms within the Homo sapiens nuclear receptor subfamily 1 group I member 2 (NR1I2) gene and susceptibility to inflammatory bowel disease (IBD) have been reported. A systematic review and meta-analysis was thus undertaken to determine whether NR1I2 gene polymorphisms are associated with an increased risk of IBD. METHODS Article retrieval was performed using on-line databases, such as PubMed, Embase, CENTRAL, and WOS. After extracting eligible data, Mantel-Haenszel statistics were applied to calculate the odds radio (OR), 95% confidence interval (95% CI) and P value under a random or fixed-effects model. RESULTS A total of seven articles with 4410 IBD subjects and 4028 controls were included. Compared with the control group, no significant increase in IBD susceptibility was observed for the -25385C/T (OR=0.92, 95% CI=0.78∼1.07, P=0.259), -24381A/C (OR=0.96, 95% CI=0.87∼1.06, P=0.378), +8055C/T (OR=1.06, 95% CI=0.97∼1.15, P=0.186), or +7635A/G (OR=0.96, 95% CI=0.87∼1.05, P=0.348) polymorphisms within the NR1I2 gene under the allele model. CONCLUSIONS Our meta-analysis failed to demonstrate an association between -25385C/T, -24381A/C, +8055C/T, or +7635A/G polymorphisms within the NR1I2 gene and overall IBD risk. A larger sample size is needed to validate our conclusion.
Collapse
Affiliation(s)
- Man-Yi Sun
- Department of Gastroenterology, Tianjin Union Medicine Center & Tianjin People's Hospital, 300121 Tianjin, PR China
| | - Jing-Na Lin
- Department of Endocrinology, Tianjin Union Medicine Center & Tianjin People's Hospital, Hongqiao District, Jieyuan Road No. 190, 300121 Tianjin, PR China.
| |
Collapse
|
16
|
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.
Collapse
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
| |
Collapse
|
17
|
Pregnane X Receptor Regulates Pathogen-Induced Inflammation and Host Defense against an Intracellular Bacterial Infection through Toll-like Receptor 4. Sci Rep 2016; 6:31936. [PMID: 27550658 PMCID: PMC4994038 DOI: 10.1038/srep31936] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 07/29/2016] [Indexed: 12/20/2022] Open
Abstract
The nuclear pregnane X receptor (PXR) plays a central role in regulating xenobiotic metabolism. We now report a novel role for PXR as a critical negative regulator of innate immunity after infection. Pxr−/− mice exhibited remarkably elevated pro-inflammatory cytokine and chemokine production following infection with Listeria monocytogenes (Lm). Despite the more robust innate immune response, Pxr−/− mice were highly susceptible to Lm infection. Surprisingly, disruption of the Toll-like receptor 4 (TLR4) but not TLR2 signaling restored the inflammation to normal levels and the ability to clear Lm in Pxr−/− mice. Mechanistically, the heightened inflammation in Pxr−/− mice resulted in the death of inflammatory monocytes that led to the enhanced susceptibility to Lm infection. These data demonstrated that PXR regulated pathogen-induced inflammation and host defense against Lm infection through modulating the TLR4 pathway. In summary, we discovered an apical role for PXR in regulating innate immunity. In addition, we uncovered a remarkable negative impact of the TLR4 pathway in controlling the quality of the inflammatory response and host defense against a gram-positive bacterial infection.
Collapse
|
18
|
Garg A, Zhao A, Erickson SL, Mukherjee S, Lau AJ, Alston L, Chang TKH, Mani S, Hirota SA. Pregnane X Receptor Activation Attenuates Inflammation-Associated Intestinal Epithelial Barrier Dysfunction by Inhibiting Cytokine-Induced Myosin Light-Chain Kinase Expression and c-Jun N-Terminal Kinase 1/2 Activation. J Pharmacol Exp Ther 2016; 359:91-101. [PMID: 27440420 DOI: 10.1124/jpet.116.234096] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 07/19/2016] [Indexed: 02/06/2023] Open
Abstract
The inflammatory bowel diseases (IBDs) are chronic inflammatory disorders with a complex etiology. IBD is thought to arise in genetically susceptible individuals in the context of aberrant interactions with the intestinal microbiota and other environmental risk factors. Recently, the pregnane X receptor (PXR) was identified as a sensor for microbial metabolites, whose activation can regulate the intestinal epithelial barrier. Mutations in NR1I2, the gene that encodes the PXR, have been linked to IBD, and in animal models, PXR deletion leads to barrier dysfunction. In the current study, we sought to assess the mechanism(s) through which the PXR regulates barrier function during inflammation. In Caco-2 intestinal epithelial cell monolayers, tumor necrosis factor-α/interferon-γ exposure disrupted the barrier and triggered zonula occludens-1 relocalization, increased expression of myosin light-chain kinase (MLCK), and activation of c-Jun N-terminal kinase 1/2 (JNK1/2). Activation of the PXR [rifaximin and [[3,5-Bis(1,1-dimethylethyl)-4-hydroxyphenyl]ethenylidene]bis-phosphonic acid tetraethyl ester (SR12813); 10 μM] protected the barrier, an effect that was associated with attenuated MLCK expression and JNK1/2 activation. In vivo, activation of the PXR [pregnenolone 16α-carbonitrile (PCN)] attenuated barrier disruption induced by toll-like receptor 4 activation in wild-type, but not Pxr-/-, mice. Furthermore, PCN treatment protected the barrier in the dextran-sulfate sodium model of experimental colitis, an effect that was associated with reduced expression of mucosal MLCK and phosphorylated JNK1/2. Together, our data suggest that the PXR regulates the intestinal epithelial barrier during inflammation by modulating cytokine-induced MLCK expression and JNK1/2 activation. Thus, targeting the PXR may prove beneficial for the treatment of inflammation-associated barrier disruption in the context of IBD.
Collapse
Affiliation(s)
- Aditya Garg
- Department of Physiology and Pharmacology (A.G., A.Z., S.L.E., L.A., S.A.H.), and Department of Microbiology, Immunology and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (Su.M., Sr.M.); and Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (A.J.L., T.K.H.C.)
| | - Angela Zhao
- Department of Physiology and Pharmacology (A.G., A.Z., S.L.E., L.A., S.A.H.), and Department of Microbiology, Immunology and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (Su.M., Sr.M.); and Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (A.J.L., T.K.H.C.)
| | - Sarah L Erickson
- Department of Physiology and Pharmacology (A.G., A.Z., S.L.E., L.A., S.A.H.), and Department of Microbiology, Immunology and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (Su.M., Sr.M.); and Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (A.J.L., T.K.H.C.)
| | - Subhajit Mukherjee
- Department of Physiology and Pharmacology (A.G., A.Z., S.L.E., L.A., S.A.H.), and Department of Microbiology, Immunology and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (Su.M., Sr.M.); and Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (A.J.L., T.K.H.C.)
| | - Aik Jiang Lau
- Department of Physiology and Pharmacology (A.G., A.Z., S.L.E., L.A., S.A.H.), and Department of Microbiology, Immunology and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (Su.M., Sr.M.); and Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (A.J.L., T.K.H.C.)
| | - Laurie Alston
- Department of Physiology and Pharmacology (A.G., A.Z., S.L.E., L.A., S.A.H.), and Department of Microbiology, Immunology and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (Su.M., Sr.M.); and Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (A.J.L., T.K.H.C.)
| | - Thomas K H Chang
- Department of Physiology and Pharmacology (A.G., A.Z., S.L.E., L.A., S.A.H.), and Department of Microbiology, Immunology and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (Su.M., Sr.M.); and Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (A.J.L., T.K.H.C.)
| | - Sridhar Mani
- Department of Physiology and Pharmacology (A.G., A.Z., S.L.E., L.A., S.A.H.), and Department of Microbiology, Immunology and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (Su.M., Sr.M.); and Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (A.J.L., T.K.H.C.)
| | - Simon A Hirota
- Department of Physiology and Pharmacology (A.G., A.Z., S.L.E., L.A., S.A.H.), and Department of Microbiology, Immunology and Infectious Diseases (S.A.H.), University of Calgary, Calgary, Alberta, Canada; Department of Medicine, Albert Einstein College of Medicine, Bronx, New York (Su.M., Sr.M.); and Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada (A.J.L., T.K.H.C.)
| |
Collapse
|
19
|
Choi Y, Jiang F, An H, Park HJ, Choi JH, Lee H. A pharmacogenomic study on the pharmacokinetics of tacrolimus in healthy subjects using the DMETTM Plus platform. THE PHARMACOGENOMICS JOURNAL 2016; 17:174-179. [DOI: 10.1038/tpj.2015.99] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 11/22/2015] [Accepted: 11/26/2015] [Indexed: 12/29/2022]
|
20
|
Koutsounas I, Giaginis C, Alexandrou P, Zizi-Serbetzoglou A, Patsouris E, Kouraklis G, Theocharis S. Pregnane X Receptor Expression in Human Pancreatic Adenocarcinoma: Associations With Clinicopathologic Parameters, Tumor Proliferative Capacity, Patients' Survival, and Retinoid X Receptor Expression. Pancreas 2015; 44:1134-40. [PMID: 26355550 DOI: 10.1097/mpa.0000000000000405] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVES Pregnane X receptor (PXR) has been involved in human malignancy, either by directly affecting carcinogenesis or by inducing drug-drug interactions and chemotherapy resistance. The present study aimed to assess the clinical significance of PXR in pancreatic adenocarcinoma. METHODS Pregnane X receptor and its heterodimers' PXR/retinoid X receptor α (RXR-α), RXR-β, and RXR-γ expression were assessed immunohistochemically on tumoral samples from 55 pancreatic adenocarcinoma patients and were associated with clinicopathologic parameters, tumor proliferative capacity, and patients' survival. RESULTS Enhanced PXR expression was noted in 24 (43.6%) of 55 pancreatic adenocarcinoma cases. Pancreatic adenocarcinoma patients presenting increased histological grade of tumor differentiation showed a significant increased incidence of elevated PXR expression (P = 0.023). Enhanced PXR/RXR-β expression was significantly associated with smaller tumor size and earlier clinical stage (P = 0.005 and P = 0.003, respectively). Elevated PXR/RXR-γ expression was significantly associated with smaller tumor size and earlier clinical stage (P = 0.012 and P = 0.014, respectively) and borderline with the absence of lymph node metastases (P = 0.056). In addition, pancreatic adenocarcinoma patients presenting enhanced PXR/RXR-γ expression showed marginally longer survival times compared with those with decreased expression (log-rank test, P = 0.053). CONCLUSIONS This study supported evidence that PXR and its copartners' overexpression may be associated with favorable clinicopathologic parameters and better outcome in pancreatic adenocarcinoma.
Collapse
Affiliation(s)
- Ioannis Koutsounas
- From the *First Department of Pathology, Medical School, National and Kapodistrian University of Athens, Athens; †Department of Food Science and Nutrition, School of the Environment, University of the Aegean, Myrina, Lemnos; ‡Department of Pathology, Tzaneio General Hospital, Piraeus; and §Second Department of Propedeutic Surgery, Medical School, University of Athens, Athens, Greece
| | | | | | | | | | | | | |
Collapse
|
21
|
Dou W, Zhang J, Li H, Kortagere S, Sun K, Ding L, Ren G, Wang Z, Mani S. Plant flavonol isorhamnetin attenuates chemically induced inflammatory bowel disease via a PXR-dependent pathway. J Nutr Biochem 2014; 25:923-33. [PMID: 24913217 DOI: 10.1016/j.jnutbio.2014.04.006] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 03/25/2014] [Accepted: 04/08/2014] [Indexed: 12/13/2022]
Abstract
Isorhamnetin is an O-methylated flavonol present in fruit and vegetables. We recently reported the identification of isorhamnetin as an activator of the human pregnane X receptor (PXR), a known target for abrogating inflammation in inflammatory bowel disease (IBD). The current study investigated the role of isorhamnetin as a putative mouse PXR activator in ameliorating chemically induced IBD. Using two different models (ulcerative colitis like and Crohn's disease like) of experimental IBD in mice, we demonstrated that isorhamnetin abrogated inflammation through inhibiting the activity of myeloperoxidase, the levels of TNF-α and IL-6, the mRNA expression of proinflammatory mediators (iNOS, ICAM-1, COX2, TNF-α, IL-2 and IL-6) and the phosphorylation of IκBα and NF-κB p65. PXR gene overexpression inhibited NF-κB luciferase activity, and the inhibition was potentiated by isorhamnetin treatment. PXR knockdown by siRNA demonstrated the necessity for PXR in isorhamnetin-mediated up-regulation of xenobiotic metabolism genes. Ligand pocket-filling mutants (S247W/C284W and S247W/C284W/S208W) of human PXR weakened the effect of isorhamnetin on PXR activation. Molecular docking studies and time-resolved fluorescence resonance energy transfer competitive binding assays confirmed the ligand (isorhamnetin)-binding affinity. These results clearly demonstrated the ameliorating effect of isorhamnetin on experimental IBD via PXR-mediated up-regulation of xenobiotic metabolism and down-regulation of NF-κB signaling. The novel findings may contribute to the effective utilization of isorhamnetin or its derivatives as a PXR ligand in the treatment of human IBD.
Collapse
Affiliation(s)
- Wei Dou
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China
| | - Jingjing Zhang
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China
| | - Hao Li
- Departments of Medicine and Genetics, Albert Einstein College of Medicine, NY 10461, USA
| | - Sandhya Kortagere
- Department of Microbiology and Immunology, Drexel University College of Medicine, PA 19129, USA
| | - Katherine Sun
- Department of Pathology, Montefiore Medical Center, NY 10467, USA
| | - Lili Ding
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China
| | - Gaiyan Ren
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China
| | - Zhengtao Wang
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China.
| | - Sridhar Mani
- Departments of Medicine and Genetics, Albert Einstein College of Medicine, NY 10461, USA.
| |
Collapse
|
22
|
Terc J, Hansen A, Alston L, Hirota SA. Pregnane X receptor agonists enhance intestinal epithelial wound healing and repair of the intestinal barrier following the induction of experimental colitis. Eur J Pharm Sci 2014; 55:12-9. [PMID: 24486481 DOI: 10.1016/j.ejps.2014.01.007] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 12/17/2013] [Accepted: 01/20/2014] [Indexed: 02/06/2023]
Abstract
The intestinal epithelial barrier plays a key role in the maintenance of homeostasis within the gastrointestinal tract. Barrier dysfunction leading to increased epithelial permeability is associated with a number of gastrointestinal disorders including the inflammatory bowel diseases (IBD) - Crohn's disease and ulcerative colitis. It is thought that the increased permeability in patients with IBD may be driven by alterations in the epithelial wound healing response. To this end considerable study has been undertaken to identify signaling pathways that may accelerate intestinal epithelial wound healing and normalize the barrier dysfunction observed in IBD. In the current study we examined the role of the pregnane X receptor (PXR) in modulating the intestinal epithelial wound healing response. Mutations and reduced mucosal expression of the PXR are associated with IBD, and others have reported that PXR agonists can dampen intestinal inflammation. Furthermore, stimulation of the PXR has been associated with increased cell migration and proliferation, two of the key processes involved in wound healing. We hypothesized that PXR agonists would enhance intestinal epithelial repair. Stimulation of Caco-2 intestinal epithelial cells with rifaximin, rifampicin and SR12813, all potent agonists of the PXR, significantly increased wound closure. This effect was driven by p38 MAP kinase-dependent cell migration, and occurred in the absence of cell proliferation. Treating mice with a rodent specific PXR agonist, pregnenolone 16α-carbonitrile (PCN), attenuated the intestinal barrier dysfunction observed in the dextran sulphate sodium (DSS) model of experimental colitis, an effect that occurred independent of the known anti-inflammatory effects of PCN. Taken together our data indicate that the activation of the PXR can enhance intestinal epithelial repair and suggest that targeting the PXR may help to normalize intestinal barrier dysfunction observed in patients with IBD. Furthermore, our data provide additional insight into the potential mechanisms through which rifaximin elicits its clinical efficacy in the treatment of IBD.
Collapse
Affiliation(s)
- Joshua Terc
- Departments of Physiology & Pharmacology, University of Calgary, 3330 Hospital Dr. NW, Health Sciences Room 1802, Calgary, Alberta T2N4N1, Canada; Microbiology, Immunology & Infectious Diseases, University of Calgary, 3330 Hospital Dr. NW, Health Sciences Room 1802, Calgary, Alberta T2N4N1, Canada
| | - Ashleigh Hansen
- Departments of Physiology & Pharmacology, University of Calgary, 3330 Hospital Dr. NW, Health Sciences Room 1802, Calgary, Alberta T2N4N1, Canada; Microbiology, Immunology & Infectious Diseases, University of Calgary, 3330 Hospital Dr. NW, Health Sciences Room 1802, Calgary, Alberta T2N4N1, Canada
| | - Laurie Alston
- Departments of Physiology & Pharmacology, University of Calgary, 3330 Hospital Dr. NW, Health Sciences Room 1802, Calgary, Alberta T2N4N1, Canada; Microbiology, Immunology & Infectious Diseases, University of Calgary, 3330 Hospital Dr. NW, Health Sciences Room 1802, Calgary, Alberta T2N4N1, Canada
| | - Simon A Hirota
- Departments of Physiology & Pharmacology, University of Calgary, 3330 Hospital Dr. NW, Health Sciences Room 1802, Calgary, Alberta T2N4N1, Canada; Microbiology, Immunology & Infectious Diseases, University of Calgary, 3330 Hospital Dr. NW, Health Sciences Room 1802, Calgary, Alberta T2N4N1, Canada.
| |
Collapse
|
23
|
Kotta-Loizou I, Patsouris E, Theocharis S. Pregnane X receptor polymorphisms associated with human diseases. Expert Opin Ther Targets 2013; 17:1167-77. [DOI: 10.1517/14728222.2013.823403] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
24
|
Genetic Variability of PXR in Saudi Arabians. Biochem Genet 2013; 51:575-87. [DOI: 10.1007/s10528-013-9588-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Accepted: 09/06/2012] [Indexed: 10/27/2022]
|
25
|
Kodama S, Negishi M. PXR cross-talks with internal and external signals in physiological and pathophysiological responses. Drug Metab Rev 2013; 45:300-10. [DOI: 10.3109/03602532.2013.795585] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
26
|
Moore J, McKnight AJ, Döhler B, Simmonds MJ, Courtney AE, Brand OJ, Briggs D, Ball S, Cockwell P, Patterson CC, Maxwell AP, Gough SCL, Opelz G, Borrows R. Donor ABCB1 variant associates with increased risk for kidney allograft failure. J Am Soc Nephrol 2012; 23:1891-9. [PMID: 23064017 DOI: 10.1681/asn.2012030260] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The impact of variation within genes responsible for the disposition and metabolism of calcineurin inhibitors (CNIs) on clinical outcomes in kidney transplantation is not well understood. Furthermore, the potential influence of donor, rather than recipient, genotypes on clinical endpoints is unknown. Here, we investigated the associations between donor and recipient gene variants with outcome among 4471 white, CNI-treated kidney transplant recipients. We tested for 52 single-nucleotide polymorphisms (SNPs) across five genes: CYP3A4, CYP3A5, ABCB1 (MDR1; encoding P-glycoprotein), NR1I2 (encoding the pregnane X receptor), and PPIA (encoding cyclophilin). In a discovery cohort of 811 patients from Birmingham, United Kingdom, kidney donor CC genotype at C3435T (rs1045642) within ABCB1, a variant known to alter protein expression, was associated with an increased risk for long-term graft failure compared with non-CC genotype (hazard ratio [HR], 1.69; 95% confidence interval [CI], 1.20-2.40; P=0.003). No other donor or recipient SNPs were associated with graft survival or mortality. We validated this association in 675 donors from Belfast, United Kingdom (HR, 1.68; 95% CI, 1.21-2.32; P=0.002), and in 2985 donors from the Collaborative Transplant Study (HR, 1.84; 95% CI, 1.08-3.13; P=0.006). In conclusion, these data suggest that an ABCB1 variant known to alter protein expression represents an attractive candidate for future study and risk stratification in kidney transplantation.
Collapse
Affiliation(s)
- Jason Moore
- Department of Nephrology and Kidney Transplantation, Queen Elizabeth Hospital, Birmingham, B15 2WB, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Cheng J, Shah YM, Gonzalez FJ. Pregnane X receptor as a target for treatment of inflammatory bowel disorders. Trends Pharmacol Sci 2012; 33:323-30. [PMID: 22609277 PMCID: PMC3368991 DOI: 10.1016/j.tips.2012.03.003] [Citation(s) in RCA: 122] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 02/27/2012] [Accepted: 03/06/2012] [Indexed: 02/07/2023]
Abstract
Pregnane X receptor (PXR; NR1I2), a member of the nuclear receptor superfamily, has a major role in the induction of genes involved in drug transport and metabolism. Recent studies in mice have provided insight into a novel function for PXR in inflammatory bowel disease (IBD). The mechanism of the protective effect of PXR activation on IBD is not fully established, but is due in part to the attenuation of nuclear factor (NF)-κB signaling that results in lower expression of proinflammatory cytokines. Recent clinical trials with the antibiotic rifaximin, a PXR agonist in the gastrointestinal system, have revealed its potential therapeutic value in the treatment of intestinal inflammation in humans. Thus, PXR may be a novel target for IBD therapy.
Collapse
Affiliation(s)
- Jie Cheng
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | | | | |
Collapse
|
28
|
PXR variants and artemisinin use in Vietnamese subjects: frequency distribution and impact on the interindividual variability of CYP3A induction by artemisinin. Antimicrob Agents Chemother 2012; 56:2153-7. [PMID: 22252826 DOI: 10.1128/aac.06009-11] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Artemisinins induce drug metabolism through the activation of the pregnane X receptor (PXR) in vitro. Here, we report the resequencing and genotyping of PXR variants in 75 Vietnamese individuals previously characterized for CYP3A enzyme activity after artemisinin exposure. We identified a total of 31 PXR variants, including 5 novel single nucleotide polymorphisms (SNPs), and we identified significantly different allele frequencies relative to other ethnic groups. A trend of significance was observed between the level of CYP3A4 induction by artemisinin and two PXR variants, the 8118C→T (Y328Y) and 10719A→G variants.
Collapse
|
29
|
Predicting Activation of the Promiscuous Human Pregnane X Receptor by Pharmacophore Ensemble/Support Vector Machine Approach. Chem Res Toxicol 2011; 24:1765-78. [DOI: 10.1021/tx200310j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
30
|
Folwaczny M, Tengler B, Glas J. Variants of the human NR1I2 (PXR) locus in chronic periodontitis. J Periodontal Res 2011; 47:174-9. [DOI: 10.1111/j.1600-0765.2011.01417.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
31
|
Glas J, Seiderer J, Fischer D, Tengler B, Pfennig S, Wetzke M, Beigel F, Olszak T, Weidinger M, Göke B, Ochsenkühn T, Folwaczny M, Müller-Myhsok B, Diegelmann J, Czamara D, Brand S. Pregnane X receptor (PXR/NR1I2) gene haplotypes modulate susceptibility to inflammatory bowel disease. Inflamm Bowel Dis 2011; 17:1917-24. [PMID: 21830270 DOI: 10.1002/ibd.21562] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Accepted: 10/07/2010] [Indexed: 12/13/2022]
Abstract
BACKGROUND The pregnane X receptor (PXR/NR1I2) is an important regulator of xenobiotic metabolism and intestinal integrity. However, there are controversial studies on the role of PXR/NR1I2 in inflammatory bowel disease (IBD). We therefore initiated the largest analysis to date on PXR/NR1I2 gene variants in IBD patients. METHODS Genomic DNA from 2823 individuals of Caucasian origin including 859 patients with Crohn's disease (CD), 464 patients with ulcerative colitis (UC), and 1500 healthy, unrelated controls was analyzed for eight PXR/NR1I2 single nucleotide polymorphisms (SNPs) (rs12721602 (-25564), rs3814055 (-25385), rs1523128 (-24756), rs1523127 (-24381), rs45610735 = p.Gly36Arg (+106), rs6785049 (+7635), rs2276707 (+8055), and rs3814057 (+11156)). In addition, detailed haplotype and genotype-phenotype analyses were performed. RESULTS The PXR/NR1I2 SNP rs2276707 was weakly associated with UC susceptibility (P = 0.01; odds ratio [OR] 1.27 [1.06-1.52]). None of the other PXR/NR1I2 SNPs were associated with UC or CD susceptibility. However, several rare PXR/NR1I2 haplotypes were highly associated with CD susceptibility. In CD, the strongest disease association was found for a haplotype consisting of the SNPs rs12721602-rs3814055-rs1523128-rs1523127-rs12721607-rs6785049-rs2276707-rs3814057 (omnibus P-value: 6.50 × 10(-15)) which was found in two separate cohorts (cohort I = discovery cohort: CD: n = 492, controls: n = 793; P = 4.51 × 10(-17); Bonferroni corrected: P = 1.27 × 10(-15); cohort II = replication cohort: CD: n = 367, controls: n = 707; P = 7.12 × 10(-4); P(corr) = 1.99 × 10(-2)). CONCLUSIONS Several PXR/NR1I2 haplotypes contribute to CD susceptibility, suggesting a role for PXR in the IBD pathogenesis of a certain patient subcohort. Given the accumulating evidence for an important role of PXR in intestinal inflammation, further analyses are required to investigate the functional and pharmacogenetic implications of these PXR/NR1I2 gene variants in IBD.
Collapse
Affiliation(s)
- Jürgen Glas
- Department of Human Genetics, RWTH Aachen, Germany
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Soltysova A, Minarik G, Dzurenkova A, Sufliarska S, Kadasi L, Turna J, Mladosievicova B. APEX microarray panel for genotyping polymorphisms in cancer chemotherapy and estimation frequencies in a Slovak population. Pharmacogenomics 2011; 12:577-92. [DOI: 10.2217/pgs.10.199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: Many studies focus on monitoring response to chemotherapy, adverse effects and prediction of therapeutic effects, which depend on individual gene variability. The amount of various polymorphisms in genes involved in the folate cycle, and other metabolic pathways involved in the metabolism of chemotherapeutic drugs, are an essential topic of such studies. This work focuses on the design and establishment of a pharmacogenetically relevant panel, which could be applied to the rapid genotyping of patients treated with thiopurines, 5-fluorouracil, methotrexate, irinotecan and glucocorticoids. Materials & methods: A total of 97 variations in 36 genes associated with side effects of chemotherapeutic treatment were selected. Of these, 94 SNPs were genotyped by the arrayed primer extension (APEX; Asper Biotech Ltd) microarray method or direct sequencing. Variations of tandem repeats or gene deletions were genotyped by capillary electrophoresis and PCR detection. A total of 300 DNA samples from healthy volunteers were tested to estimate genotype frequencies for a Slovak population. All data were checked for Hardy–Weinberg equilibrium and genetic linkage between variations. Results: We designed an APEX microarray for genotyping pharmacologically relevant polymorphisms in patients undergoing chemotherapy. We estimated genotype frequencies for all 97 polymorphisms testing 300 individuals from the Slovak population, which may also serve as an estimate of central European frequencies. These data also allowed for the testing of genetic linkage between loci. Many of the determined genotype frequencies in this study were in similar ranges found in other European populations but four SNPs, rs11760837 (p = 0.018), rs1801265 (p = 0.0375), rs1801394 (p = 0.0066) and rs182455 (p = 0.0083), demonstrated stronger deviation. Conclusion: Genetic variability in genes involved in metabolic pathways of chemotherapeutic drugs, such as methotrexate, 5-fluorouracil, thiopurines or irinotecan, is responsible for individual therapy response and development of side effects. A comprehensive approach in genotyping of numerous variants is aimed to improve individual access to patients and the selection of appropriate drugs for treatment. The APEX microarray method is a valuable tool for fast, reliable and cost-effective genotyping of variants which can be used for the typing of known variants in patients prior to treatment as well as in studies searching for new genotype–phenotype associations. The opportunity of adding additional variants during the study makes the APEX microarray technology flexible and suitable for such trials. Original submitted 4 October 2010; Revision submitted 23 November 2010.
Collapse
Affiliation(s)
| | - Gabriel Minarik
- Department of Molecular Biology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, 842 15 Bratislava 4, Slovakia
| | - Alica Dzurenkova
- Institute of Pathological Physiology, School of Medicine, Comenius University, Sasinkova 4, 811 08 Bratislava, Slovakia
| | - Sabina Sufliarska
- Institute of Pathological Physiology, School of Medicine, Comenius University, Sasinkova 4, 811 08 Bratislava, Slovakia
| | - Ludevit Kadasi
- Department of Molecular Biology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, 842 15 Bratislava 4, Slovakia
| | - Jan Turna
- Department of Molecular Biology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, 842 15 Bratislava 4, Slovakia
| | - Beata Mladosievicova
- Institute of Pathological Physiology, School of Medicine, Comenius University, Sasinkova 4, 811 08 Bratislava, Slovakia
| |
Collapse
|
33
|
Trauner M, Halilbasic E. Nuclear receptors as new perspective for the management of liver diseases. Gastroenterology 2011; 140:1120-1125.e1-12. [PMID: 21334334 DOI: 10.1053/j.gastro.2011.02.044] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Nuclear receptors (NRs) are ligand-activated transcription factors that act as sensors for a broad range of natural and synthetic ligands and regulate several key hepatic functions including bile acid homeostasis, bile secretion, lipid and glucose metabolism, as well as drug deposition. Moreover, NRs control hepatic inflammation, regeneration, fibrosis, and tumor formation. Therefore, NRs are key for understanding the pathogenesis and pathophysiology of a wide range of hepatic disorders. Finally, targeting NRs and their alterations offers exciting new perspectives for the treatment of liver diseases.
Collapse
Affiliation(s)
- Michael Trauner
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Austria.
| | | |
Collapse
|
34
|
Andersen V, Christensen J, Ernst A, Jacobsen BA, Tjønneland A, Krarup HB, Vogel U. Polymorphisms in NF-κB, PXR, LXR, PPARγ and risk of inflammatory bowel disease. World J Gastroenterol 2011; 17:197-206. [PMID: 21245992 PMCID: PMC3020373 DOI: 10.3748/wjg.v17.i2.197] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2010] [Revised: 08/14/2010] [Accepted: 08/21/2010] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the contribution of polymorphisms in nuclear receptors to risk of inflammatory bowel disease (IBD).
METHODS: Genotypes of nuclear factor (NF)-κB (NFKB1) NFκB -94ins/del (rs28362491); peroxisome proliferator-activated receptor (PPAR)-γ (PPARγ) PPARγ Pro12Ala (rs 1801282) and C1431T (rs 3856806); pregnane X receptor (PXR) (NR1I2) PXR A-24381C (rs1523127), C8055T (2276707), and A7635G (rs 6785049); and liver X receptor (LXR) (NR1H2) LXR T-rs1405655-C and T-rs2695121-C were assessed in a Danish case-control study of 327 Crohn’s disease patients, 495 ulcerative colitis (UC) patients, and 779 healthy controls. Odds ratio (OR) and 95% CI were estimated by logistic regression models.
RESULTS: The PXR A7635G variant, the PPARγ Pro12Ala and LXR T-rs2695121-C homozygous variant genotypes were associated with risk of UC (OR: 1.31, 95% CI: 1.03-1.66, P = 0.03, OR: 2.30, 95% CI: 1.04-5.08, P = 0.04, and OR: 1.41, 95% CI: 1.00-1.98, P = 0.05, respectively) compared to the corresponding homozygous wild-type genotypes. Among never smokers, PXR A7635G and the LXR T-rs1405655-C and T-rs2695121-C variant genotypes were associated with risk of IBD (OR: 1.41, 95% CI: 1.05-1.91, P = 0.02, OR: 1.63, 95% CI: 1.21-2.20, P = 0.001, and OR: 2.02, 95% CI: 1.36-2.99, P = 0.0005, respectively) compared to the respective homozygous variant genotypes. PXR A7635G (rs6785049) variant genotype was associated with a higher risk of UC diagnosis before the age of 40 years and with a higher risk of extensive disease (OR: 1.34, 95% CI: 1.03-1.75 and OR: 2.49, 95% CI: 1.24-5.03, respectively).
CONCLUSION: Common PXR and LXR polymorphisms may contribute to risk of IBD, especially among never smokers.
Collapse
|
35
|
Ghanem CI, Arias A, Novak A, Carpini GD, Villanueva S, Blazquez AG, Marin JJ, Mottino AD, Rubio MC. Acetaminophen-induced stimulation of MDR1 expression and activity in rat intestine and in LS 174T human intestinal cell line. Biochem Pharmacol 2011; 81:244-50. [DOI: 10.1016/j.bcp.2010.10.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 10/06/2010] [Accepted: 10/08/2010] [Indexed: 10/18/2022]
|
36
|
Ouyang N, Ke S, Eagleton N, Xie Y, Chen G, Laffins B, Yao H, Zhou B, Tian Y. Pregnane X receptor suppresses proliferation and tumourigenicity of colon cancer cells. Br J Cancer 2010; 102:1753-61. [PMID: 20531417 PMCID: PMC2883694 DOI: 10.1038/sj.bjc.6605677] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2009] [Revised: 03/29/2010] [Accepted: 03/31/2010] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Pregnane X receptor (PXR) is a nuclear receptor that regulates the metabolism and disposition of various xenobiotics and endobioitics. We investigated a novel PXR function in regulating colon tumourigenesis in this study. METHODS Histochemistry, transfection, cell proliferation assay, anchorage-alpha-dependent assay, xenograft, immunohistochemistry, immunofluorescence flow cytometry. RESULTS Using histochemistry analysis, we found that PXR expressions were lost or greatly diminished in many colon tumours. Ectopic expression of human PXR through stable transfection of PXR into colon cancer cell line HT29 significantly inhibited cell proliferation as determined by cell proliferation assay and anchorage-independent assay. Pregnane X receptor suppressed significantly HT29 xenograft tumour growth in nude mice compared with control (310+/-6.2 vs 120+/-6 mg, P<0.01). Immunohistochemistry and immunofluorescence analysis of Ki-67 on excised xenograft tumour tissues showed that PXR inhibited cancer cell proliferation. Furthermore, expressions of PXR and Ki-67 were mutually exclusive. The flow cytometry analysis indicated that PXR caused G(0)/G(1) cell-cycle arrest. p21(WAF1/CIP1) expression was markedly elevated whereas E2F1 expression was inhibited by PXR. CONCLUSION PXR inhibits the proliferation and tumourigenicity of colon cancer cells by controlling cell cycle at G(0)/G(1) cell phase by regulating p21(WAF1/CIP1) and E2F/Rb pathways.
Collapse
Affiliation(s)
- N Ouyang
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77843, USA
| | - S Ke
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77843, USA
| | - N Eagleton
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77843, USA
| | - Y Xie
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77843, USA
| | - G Chen
- The First Affiliated Hospital of Guangzhou Medical College, Guangzhou, China
| | - B Laffins
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77843, USA
| | - H Yao
- Chemotherapy Department, Sun Yet-Sen Memorial Hospital, Guangzhou, China
| | - B Zhou
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77843, USA
| | - Y Tian
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77843, USA
| |
Collapse
|
37
|
Meyer zu Schwabedissen HE, Kim RB. Hepatic OATP1B transporters and nuclear receptors PXR and CAR: interplay, regulation of drug disposition genes, and single nucleotide polymorphisms. Mol Pharm 2010; 6:1644-61. [PMID: 19558188 DOI: 10.1021/mp9000298] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Drug uptake transporters are now increasingly recognized as clinically relevant determinants of variable drug responsiveness and unexpected drug-drug interactions. Emerging evidence strongly suggests members of the organic anion transporting polypeptide (OATP) family appear to be particularly important to the disposition of many drugs in clinical use today. Specifically, the liver-enriched OATP1B subfamily members OATP1B1 and OATP1B3 exhibit broad substrate specificity and the ability to transport drugs which are ligands for xenobiotic sensing nuclear receptors such as the pregnane X receptor (PXR) and the constitutive androstane receptor (CAR). Accordingly, OATP1B transporters may indirectly regulate expression of drug metabolism genes via modulation of the intracellular concentration of PXR and CAR ligands. Moreover, a number of functionally important single nucleotide polymorphisms (SNPs) in OATP1B transporters have been described. In this review, a brief summary of known SNPs in PXR and CAR will be followed by an in-depth outline of OATP1B1 and OATP1B3 transporters particularly in relation to the known SNPs in these OATPs and the interplay between OATP1B transporters with PXR and CAR, both in vitro and in vivo.
Collapse
|
38
|
Nuclear pregnane X receptor single nucleotide polymorphism (-25385C/T) is not associated with inflammatory bowel disease in pediatric patients. J Pediatr Gastroenterol Nutr 2009; 49:147-50. [PMID: 19516190 DOI: 10.1097/mpg.0b013e31818de1a8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Studies in adults characterized the role of the pregnane X receptor (PXR) in the pathophysiology of inflammatory bowel disease (IBD) with conflicting results; pediatric studies are still lacking. PATIENTS AND METHODS Genotyping for the -25385C/T polymorphism of the PXR gene in 187 white children with IBD and 185 controls. Determination of colonic PXR expression in selected patients with IBD. RESULTS Minor allele frequency was seen in 35.6% patients with IBD and 40.5% controls (P = 0.174), although no significant differences were seen between the genotypes (P = 0.366). PXR was underexpressed in colonic tissue of 7 out of 11 Crohn disease and in 4 out of 5 patients with ulcerative colitis. CONCLUSIONS We could not confirm an association of the -25385C/T polymorphism in pediatric patients with IBD.
Collapse
|
39
|
di Masi A, De Marinis E, Ascenzi P, Marino M. Nuclear receptors CAR and PXR: Molecular, functional, and biomedical aspects. Mol Aspects Med 2009; 30:297-343. [PMID: 19427329 DOI: 10.1016/j.mam.2009.04.002] [Citation(s) in RCA: 213] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Accepted: 04/28/2009] [Indexed: 12/31/2022]
Abstract
Nuclear receptors (NRs) are ligand-activated transcription factors sharing a common evolutionary history and having similar sequence features at the protein level. Selective ligand(s) for some NRs is not known, therefore these NRs have been named "orphan receptors". Whenever ligands have been recognized for any of the orphan receptor, it has been categorized and grouped as "adopted" orphan receptor. This group includes the constitutive androstane receptor (CAR) and the pregnane X receptor (PXR). They function as sensors of toxic byproducts derived from endogenous metabolites and of exogenous chemicals, in order to enhance their elimination. This unique function of CAR and PXR sets them apart from the steroid hormone receptors. The broad response profile has established that CAR and PXR are xenobiotic sensors that coordinately regulate xenobiotic clearance in the liver and intestine via induction of genes involved in drug and xenobiotic metabolism. In the past few years, research has revealed new and mostly unsuspected roles for CAR and PXR in modulating hormone, lipid, and energy homeostasis as well as cancer and liver steatosis. The purpose of this review is to highlight the structural and molecular bases of CAR and PXR impact on human health, providing information on mechanisms through which diet, chemical exposure, and environment ultimately impact health and disease.
Collapse
Affiliation(s)
- Alessandra di Masi
- Department of Biology, University Roma Tre, Viale Guglielmo Marconi 446, I-00146 Roma, Italy
| | | | | | | |
Collapse
|
40
|
Zhang B, Xie W, Krasowski MD. PXR: a xenobiotic receptor of diverse function implicated in pharmacogenetics. Pharmacogenomics 2009; 9:1695-709. [PMID: 19018724 DOI: 10.2217/14622416.9.11.1695] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The pregnane X receptor (PXR; NR1I2), a member of the nuclear receptor superfamily, regulates the expression of drug-metabolic enzymes and transporters involved in the responses of mammals to their chemical environment. The same enzyme and transporter systems are also involved in the homeostasis of numerous endogenous chemicals. The regulatory function of PXR is implicated in normal physiology and diseases, such as drug-drug interactions, hepatic steatosis, vitamin D homeostasis, bile acids homeostasis, steroid hormones homeostasis and inflammatory bowel diseases. As such, any genetic variations of this receptor could potentially have widespread effects on the disposition of xenobiotics and endobiotics. Knowledge concerning the genetic polymorphisms of PXR may help to understand the variations in human drug response and ensure safe drug use. The correlation of PXR genetic polymorphisms with several disease conditions also suggests that this receptor may represent a valid therapeutic for hepato-intestinal disorders such as inflammatory bowel disease and primary sclerosing cholangitis.
Collapse
Affiliation(s)
- Bin Zhang
- Center for Pharmacogenetics, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | | | | |
Collapse
|
41
|
Zhou C, Verma S, Blumberg B. The steroid and xenobiotic receptor (SXR), beyond xenobiotic metabolism. NUCLEAR RECEPTOR SIGNALING 2009; 7:e001. [PMID: 19240808 PMCID: PMC2646121 DOI: 10.1621/nrs.07001] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Accepted: 12/12/2008] [Indexed: 12/31/2022]
Abstract
The steroid and xenobiotic receptor (SXR) (also known as pregnane X receptor or PXR) is a nuclear hormone receptor activated by a diverse array of endogenous hormones, dietary steroids, pharmaceutical agents, and xenobiotic compounds. SXR has an enlarged, flexible, hydrophobic ligand binding domain (LBD) which is remarkably divergent across mammalian species and SXR exhibits considerable differences in its pharmacology among mammals. The broad response profile of SXR has led to the development of "the steroid and xenobiotic sensor hypothesis". SXR has been established as a xenobiotic sensor that coordinately regulates xenobiotic clearance in the liver and intestine via induction of genes involved in drug and xenobiotic metabolism. In the past few years, research has revealed new and mostly unsuspected roles for SXR in modulating inflammation, bone homeostasis, vitamin D metabolism, lipid homeostasis, energy homeostasis and cancer. The identification of SXR as a xenobiotic sensor has provided an important tool for studying new mechanisms through which diet, chemical exposure, and environment ultimately impact health and disease. The discovery and pharmacological development of new PXR modulators might represent an interesting and innovative therapeutic approach to combat various diseases.
Collapse
Affiliation(s)
- Changcheng Zhou
- Laboratory of Biochemical Genetics and Metabolism, The Rockefeller University, New York, New York, USA.
| | | | | |
Collapse
|
42
|
Ma X, Idle JR, Gonzalez FJ. The pregnane X receptor: from bench to bedside. Expert Opin Drug Metab Toxicol 2008; 4:895-908. [PMID: 18624678 DOI: 10.1517/17425255.4.7.895] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND The pregnane X receptor (PXR; NR1I2), a member of the nuclear receptor superfamily, regulates the expression of metabolic enzymes and transporters involved in the response of mammals to their chemical environment. OBJECTIVE To summarize the functions and clinical implications of PXR. METHODS In the current review, the clinical implications of PXR are discussed, and the use of genetically engineered PXR mouse models is highlighted. RESULTS/CONCLUSION Recent advances in mouse models, including Pxr-null and PXR-humanized mice, provide in vivo tools for evaluating the physiological functions of PXR and its role in controlling xenobiotic metabolism and transport. By using the PXR knockout and humanized mouse models, PXR was found to influence drug-drug interactions, hepatic steatosis, and the homeostasis of vitamin D, bile acids, and steroid hormones. PXR was also shown to influence inflammatory bowel diseases.
Collapse
Affiliation(s)
- Xiaochao Ma
- National Cancer Institute, Laboratory of Metabolism, Center for Cancer Research, National Institutes of Health, Bethesda, MD 20892, USA
| | | | | |
Collapse
|
43
|
Amre DK, Mack DR, Israel D, Morgan K, Krupoves A, Costea I, Lambrette P, Grimard G, Deslandres C, Levy E, Seidman EG. Investigation of associations between the pregnane-X receptor gene (NR1I2) and Crohn's disease in Canadian children using a gene-wide haplotype-based approach. Inflamm Bowel Dis 2008; 14:1214-8. [PMID: 18381611 DOI: 10.1002/ibd.20461] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
BACKGROUND The pregnane-X-receptor (PXR) is involved in the metabolism and detoxification of numerous xenobiotics and is critical for maintaining intestinal integrity. The NR1I2 gene encoding PXR may confer susceptibility for Crohn's disease (CD) but evidence for associations is conflicting. We investigated whether the NR1I2 gene was associated with susceptibility for pediatric CD. METHODS A case-control and family-based (case-parent) study was carried out at 3 inflammatory bowel disease (IBD) clinics across Canada. Confirmed cases of CD <20 years were diagnosed using standard criteria. For determination of gene associations parents of the cases and unrelated controls were evaluated. Clinical phenotypes were established based on the Montreal Classification scheme. Eight tag-SNPs (tag-single nucleotide polymorphisms) across the gene were genotyped for allelic or genotypic associations. RESULTS A total of 270 CD cases, 336 controls, and 395 parents were studied. The mean age (+/-SD) of the cases was 12.1 (+/-3.5) years of age. Most cases were male (56.3%), had disease location L3+/-L4 (58.1%), and an inflammatory phenotype B1+/-p (88.4%) at diagnosis. For 7 SNPs single SNP analysis using case-control or case-parent data did not reveal associations with development of CD and none of the SNPs were significantly associated with disease location or disease behavior at diagnosis. One SNP rs2461823 (P = 0.05) was nominally associated with CD. No overall haplotype association (omnibus P-value = 0.61) or associations with individual haplotypes was evident. CONCLUSIONS Our gene-wide analysis in a pediatric cohort using both the case-control and case-parent designs suggests that the NR1I2 gene is not associated with CD in Canadian children.
Collapse
Affiliation(s)
- Devendra K Amre
- Department of Pediatrics, University of Montreal, Montreal, Canada.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|