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Hannon SL, Ding X. Assessing cytochrome P450 function using genetically engineered mouse models. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2022; 95:253-284. [PMID: 35953157 PMCID: PMC10544722 DOI: 10.1016/bs.apha.2022.05.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The ability to knock out and/or humanize different genes in experimental animals, globally or in cell- and tissue-specific patterns, has revolutionized scientific research in many areas. Genetically engineered mouse models, including knockout models, transgenic models, and humanized models, have played important roles in revealing the in vivo functions of various cytochrome P450 (CYP) enzymes. These functions are very diverse, ranging from the biotransformation of drugs and other xenobiotics, events that often dictate their pharmacokinetic or toxicokinetic properties and the associated therapeutic or adverse actions, to the metabolism of endogenous compounds, such as steroid hormones and other bioactive substances, that may determine susceptibility to many diseases, such as cancer and metabolic diseases. In this review, we provide a comprehensive list of Cyp-knockout, human CYP-transgenic, and CYP-humanized mouse models that target genes in the CYP1-4 gene families, and highlight their utility in assessing the in vivo metabolism, bioactivation, and toxicity of various xenobiotic compounds, including therapeutic agents and chemical carcinogens. We aim to showcase the advantages of utilizing these mouse models for in vivo drug metabolism and toxicology studies, and to encourage and facilitate greater utility of engineered mouse models to further improve our knowledge of the in vivo functions of various P450 enzymes, which is integral to our ability to develop safer and more effective therapeutics and to identify individuals predisposed to adverse drug reactions or environmental diseases.
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Affiliation(s)
- Sarrah L Hannon
- Department of Pharmacology and Toxicology, Ken R. Coit College of Pharmacy, The University of Arizona, Tucson, AZ, United States
| | - Xinxin Ding
- Department of Pharmacology and Toxicology, Ken R. Coit College of Pharmacy, The University of Arizona, Tucson, AZ, United States.
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He Y, Lian W, Ding L, Fan X, Ma J, Zhang QY, Ding X, Lin G. Lung injury induced by pyrrolizidine alkaloids depends on metabolism by hepatic cytochrome P450s and blood transport of reactive metabolites. Arch Toxicol 2021; 95:103-116. [PMID: 33033841 PMCID: PMC8765307 DOI: 10.1007/s00204-020-02921-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 09/17/2020] [Indexed: 01/20/2023]
Abstract
Pyrrolizidine alkaloids (PAs) are common phytotoxins with both hepatotoxicity and pneumotoxicity. Hepatic cytochrome P450 enzymes are known to bioactivate PAs into reactive metabolites, which can interact with proteins to form pyrrole-protein adducts and cause intrahepatic cytotoxicity. However, the metabolic and initiation biochemical mechanisms underlying PA-induced pneumotoxicity remain unclear. To investigate the in vivo metabolism basis for PA-induced lung injury, this study used mice with conditional deletion of the cytochrome P450 reductase (Cpr) gene and resultant tissue-selective ablation of microsomal P450 enzyme activities. After oral exposure to monocrotaline (MCT), a pneumotoxic PA widely used to establish animal lung injury models, liver-specific Cpr-null (LCN) mice, but not extrahepatic Cpr-low (xh-CL) mice, had significantly lower level of pyrrole-protein adducts in the serum, liver and lungs compared with wild-type (WT) mice. While MCT-exposed LCN mice had significantly higher blood concentration of intact MCT, compared to MCT-exposed WT or xh-CL mice. Consistent with the MCT in vivo bioactivation data, MCT-induced lung injury, represented by vasculature damage, in WT and xh-CL mice but not LCN mice. Furthermore, reactive metabolites of MCT were confirmed to exist in the blood efflux from the hepatic veins of MCT-exposed rats. Our results provide the first mode-of-action evidence that hepatic P450s are essential for the bioactivation of MCT, and blood circulating reactive metabolites of MCT to the lung causes pneumotoxicity. Collectively, this study presents the scientific basis for the application of MCT in animal lung injury models, and more importantly, warrants public awareness and further investigations of lung diseases associated with exposure to not only MCT but also different PAs.
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Affiliation(s)
- Yisheng He
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People's Republic of China
| | - Wei Lian
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People's Republic of China
| | - Liang Ding
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, USA
| | - Xiaoyu Fan
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, USA
| | - Jiang Ma
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People's Republic of China
| | - Qing-Yu Zhang
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, USA
| | - Xinxin Ding
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, USA.
| | - Ge Lin
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People's Republic of China.
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Ding L, Li L, Liu S, Bao X, Dickman KG, Sell SS, Mei C, Zhang QY, Gu J, Ding X. Proximal Tubular Vacuolization and Hypersensitivity to Drug-Induced Nephrotoxicity in Male Mice With Decreased Expression of the NADPH-Cytochrome P450 Reductase. Toxicol Sci 2020; 173:362-372. [PMID: 31693140 DOI: 10.1093/toxsci/kfz225] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The effect of variations in the expression of cytochrome P450 reductase (CPR or POR) is determined in mice with decreased POR expression to identify potential vulnerabilities in people with low POR expression. There is an age-dependent appearance of increasing vacuolization in the proximal tubules of the renal cortex in 4- to 9-month-old male (but not female) Cpr-low (CL) mice. These mice have low POR expression in all cells of the body and upregulation of lysosome-associated membrane protein 1 expression in the renal cortex. Vacuolization is also seen in extrahepatic CL and extrarenal CL male mice, but not in mice with tissue-specific Por deletion in liver, intestinal epithelium, or kidney. The occurrence of vacuolization is accompanied by increases in serum blood-urea-nitrogen levels. Male CL mice are hypersensitive to cisplatin- and gentamicin-induced renal toxicity at 3 months of age, before proximal tubular (PT) vacuoles are detectable. At doses that do not cause renal toxicity in wild-type mice, both drugs cause substantial increases in serum blood-urea-nitrogen levels and PT vacuolization in male but not female CL mice. The hypersensitivity to drug-induced renal toxicity is accompanied by increases in circulating drug levels. These novel findings demonstrate deficiency of renal function in mice with globally reduced POR expression and suggest that low POR expression may be a risk factor for drug-induced nephrotoxicity in humans.
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Affiliation(s)
- Liang Ding
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona.,College of Nanoscale Science and Engineering, SUNY Polytechnic Institute, Albany, New York
| | - Lei Li
- New York State Department of Health, Wadsworth Center, Albany, New York
| | - Senyan Liu
- New York State Department of Health, Wadsworth Center, Albany, New York.,Kidney Institute & Division of Nephrology, Changzheng Hospital, Shanghai 200003, China
| | - Xiaochen Bao
- New York State Department of Health, Wadsworth Center, Albany, New York
| | - Kathleen G Dickman
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, New York 11794
| | - Stewart S Sell
- New York State Department of Health, Wadsworth Center, Albany, New York.,School of Public Health, State University of New York at Albany, Albany, New York 12201
| | - Changlin Mei
- Kidney Institute & Division of Nephrology, Changzheng Hospital, Shanghai 200003, China
| | - Qing-Yu Zhang
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona.,New York State Department of Health, Wadsworth Center, Albany, New York.,School of Public Health, State University of New York at Albany, Albany, New York 12201
| | - Jun Gu
- New York State Department of Health, Wadsworth Center, Albany, New York.,School of Public Health, State University of New York at Albany, Albany, New York 12201
| | - Xinxin Ding
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona.,College of Nanoscale Science and Engineering, SUNY Polytechnic Institute, Albany, New York
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Porokuokka LL, Virtanen HT, Lindén J, Sidorova Y, Danilova T, Lindahl M, Saarma M, Andressoo JO. Gfra1 Underexpression Causes Hirschsprung's Disease and Associated Enterocolitis in Mice. Cell Mol Gastroenterol Hepatol 2018; 7:655-678. [PMID: 30594740 PMCID: PMC6444303 DOI: 10.1016/j.jcmgh.2018.12.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 12/19/2018] [Accepted: 12/19/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS RET, the receptor for the glial cell line-derived neurotrophic factor (GDNF) family ligands, is the most frequently mutated gene in congenital aganglionic megacolon or Hirschsprung's disease (HSCR). The leading cause of mortality in HSCR is HSCR-associated enterocolitis (HAEC), which is characterized by altered mucin composition, mucin retention, bacterial adhesion to enterocytes, and epithelial damage, although the order of these events is obscure. In mice, loss of GDNF signaling leads to a severely underdeveloped enteric nervous system and neonatally fatal kidney agenesis, thereby precluding the use of these mice for modeling postnatal HSCR and HAEC. Our aim was to generate a postnatally viable mouse model for HSCR/HAEC and analyze HAEC etiology. METHODS GDNF family receptor alpha-1 (GFRa1) hypomorphic mice were generated by placing a selectable marker gene in the sixth intron of the Gfra1 locus using gene targeting in mouse embryonic stem cells. RESULTS We report that 70%-80% reduction in GDNF co-receptor GFRa1 expression levels in mice results in HSCR and HAEC, leading to death within the first 25 postnatal days. These mice mirror the disease progression and histopathologic findings in children with untreated HSCR/HAEC. CONCLUSIONS In GFRa1 hypomorphic mice, HAEC proceeds from goblet cell dysplasia, with abnormal mucin production and retention, to epithelial damage. Microbial enterocyte adherence and tissue invasion are late events and therefore unlikely to be the primary cause of HAEC. These results suggest that goblet cells may be a potential target for preventative treatment and that reduced expression of GFRa1 may contribute to HSCR susceptibility.
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Affiliation(s)
| | | | - Jere Lindén
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Yulia Sidorova
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Tatiana Danilova
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Maria Lindahl
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Mart Saarma
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Jaan-Olle Andressoo
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland,Correspondence Address correspondence to: Jaan-Olle Andressoo, PhD, Department of Pharmacology, Faculty of Medicine, Helsinki Institute of Life Science, University of Helsinki, PO Box 63, 00014 Helsinki, Finland.
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Wei Y, Wang D, Chen M, Ouyang Z, Wang S, Gu J. Extrahepatic cytochrome P450s play an insignificant role in triptolide-induced toxicity. Chin Med 2018; 13:23. [PMID: 29713369 PMCID: PMC5913882 DOI: 10.1186/s13020-018-0179-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Accepted: 04/12/2018] [Indexed: 01/10/2023] Open
Abstract
Background Triptolide, an active ingredient of Chinese medicine plant Tripterygium wilfordii Hook.f., has been shown to exert anti-tumor, immunosuppressive, anti-inflammatory, and anti-fertility pharmacological effects. However, triptolide also causes severe side effects, which are manifested as toxicities in multiple organs. The aim of this study was to analyze the role of extrahepatic cytochrome P450 enzymes in triptolide-induced toxicity. Methods Xh-CL mouse model with normal liver, but low extrahepatic P450 expression levels was used in this study. Xh-CL mice and C57BL/6 (wildtype, WT) mice were treated with 200 μg/kg triptolide intraperitoneally every other day for 30 days. The serum levels of alanine aminotransferase (ALT), aspartate transaminase (AST), creatine (Cre), and blood urea nitrogen (BUN) were detected by kits. The changes of tissue were observed with H&E staining. Two groups of mice (Xh-CL and WT animals), were received a single dose of 1 mg/kg TP by oral gavage for pharmacokinetic analysis. Results Xh-CL mice displayed higher serum levels of ALT, AST, Cre, and BUN compared to untreated Xh-CL mice. The organ-to-body weight ratio for spleen was high, while that for testes was low. Histopathological changes were observed in multiple organs. However, compared with triptolide-treated WT mice, no significant differences in either blood chemistry or histopathology were recorded. Furthermore, pharmacokinetic studies showed no significant differences between triptolide-treated Xh-CL and WT mice. Conclusions Our findings suggest that sub-chronic triptolide treatment can induce toxicities in mouse kidney, spleen, and testis with or without normal local P450 functions. Therefore, extrahepatic P450s play an insignificant role in triptolide-induced toxicity. Electronic supplementary material The online version of this article (10.1186/s13020-018-0179-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yuan Wei
- 1School of Pharmacy, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu People's Republic of China
| | - Dujun Wang
- 1School of Pharmacy, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu People's Republic of China
| | - Meng Chen
- 2Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH USA
| | - Zhen Ouyang
- 1School of Pharmacy, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu People's Republic of China
| | - Shuo Wang
- 1School of Pharmacy, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu People's Republic of China
| | - Jun Gu
- 3Wadsworth Center, New York State Department of Health, 1400 Washington Ave, Albany, NY USA.,4School of Public Health, State University of New York at Albany, Albany, NY USA
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Qiao Y, Wen J, Tang F, Martell S, Shomer N, Leung PCK, Stephenson MD, Rajcan-Separovic E. Whole exome sequencing in recurrent early pregnancy loss. Mol Hum Reprod 2016; 22:364-72. [PMID: 26826164 DOI: 10.1093/molehr/gaw008] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 01/25/2016] [Indexed: 12/20/2022] Open
Abstract
STUDY HYPOTHESIS Exome sequencing can identify genetic causes of idiopathic recurrent pregnancy loss (RPL). STUDY FINDING We identified compound heterozygous deleterious mutations affecting DYNC2H1 and ALOX15 in two out of four families with RPL. Both genes have a role in early development. Bioinformatics analysis of all genes with rare and putatively pathogenic mutations in miscarriages and couples showed enrichment in pathways relevant to pregnancy loss, including the complement and coagulation cascades pathways. WHAT IS KNOWN ALREADY Next generation sequencing (NGS) is increasingly being used to identify known and novel gene mutations in children with developmental delay and in fetuses with ultrasound-detected anomalies. In contrast, NGS is rarely used to study pregnancy loss. Chromosome microarray analysis detects putatively causative DNA copy number variants (CNVs) in ∼2% of miscarriages and CNVs of unknown significance (predominantly parental in origin) in up to 40% of miscarriages. Therefore, a large number of miscarriages still have an unknown cause. STUDY DESIGN, SAMPLES/MATERIALS, METHODS Whole exome sequencing (WES) was performed using Illumina HiSeq 2000 platform on seven euploid miscarriages from four families with RPL. Golden Helix SVS v8.1.5 was used for data assessment and inheritance analysis for deleterious DNA variants predicted to severely disrupt protein-coding genes by introducing a frameshift, loss of the stop codon, gain of the stop codon, changes in splicing or the initial codon. Webgestalt (http://bioinfo.vanderbilt.edu/webgestalt/) was used for pathway and disease association enrichment analysis of a gene pool containing putatively pathogenic variants in miscarriages and couples in comparison to control gene pools. MAIN RESULTS AND THE ROLE OF CHANCE Compound heterozygous mutations in DYNC2H1 and ALOX15 were identified in miscarriages from two families with RPL. DYNC2H1 is involved in cilia biogenesis and has been associated with fetal lethality in humans. ALOX15 is expressed in placenta and its dysregulation has been associated with inflammation, placental, dysfunction, abnormal oxidative stress response and angiogenesis. The pool of putatively pathogenic single nucleotide variants (SNVs) and small insertions and deletions (indels) detected in the miscarriages showed enrichment in 'complement and coagulation cascades pathway', and 'ciliary motility disorders'. We conclude that CNVs, individual SNVs and pool of deleterious gene mutations identified by exome sequencing could contribute to RPL. LIMITATIONS, REASONS FOR CAUTION The size of our sample cohort is small. The functional effect of candidate mutations should be evaluated to determine whether the mutations are causative. WIDER IMPLICATIONS OF THE FINDINGS This is the first study to assess whether SNVs may contribute to the pathogenesis of miscarriage. Furthermore, our findings suggest that collective effect of mutations in relevant biological pathways could be implicated in RPL. STUDY FUNDING AND COMPETING INTERESTS The study was funded by Canadian Institutes of Health Research (grant MOP 106467) and Michael Smith Foundation of Health Research Career Scholar salary award to ERS.
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Affiliation(s)
- Ying Qiao
- Department of Pathology, BC Child and Family Research Institute (CFRI), University of British Columbia (UBC), Vancouver, BC, Canada
| | - Jiadi Wen
- University of Texas, Dallas, TX, USA
| | - Flamingo Tang
- Department of Pathology, BC Child and Family Research Institute (CFRI), University of British Columbia (UBC), Vancouver, BC, Canada
| | - Sally Martell
- Department of Pathology, BC Child and Family Research Institute (CFRI), University of British Columbia (UBC), Vancouver, BC, Canada
| | - Naomi Shomer
- Department of Pathology, BC Child and Family Research Institute (CFRI), University of British Columbia (UBC), Vancouver, BC, Canada
| | - Peter C K Leung
- Department of Obstetrics and Gynaecology, University of British Columbia, Vancouver, BC, Canada V6Z 2 K5
| | - Mary D Stephenson
- University of Chicago and University of Illinois at Chicago, Chicago, IL, USA
| | - Evica Rajcan-Separovic
- Department of Pathology, BC Child and Family Research Institute (CFRI), University of British Columbia (UBC), Vancouver, BC, Canada
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Zhang Y, Dong F, Zhang N, Cheng H, Pang Y, Wang X, Xu J, Ding X, Cheng T, Gu J, Yuan W. Suppression of cytochrome p450 reductase enhances long-term hematopoietic stem cell repopulation efficiency in mice. PLoS One 2013; 8:e69913. [PMID: 23922855 PMCID: PMC3724780 DOI: 10.1371/journal.pone.0069913] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2013] [Accepted: 06/13/2013] [Indexed: 11/19/2022] Open
Abstract
Background Bone marrow microenvironment (niche) plays essential roles in the fate of hematopoietic stem cells (HSCs). Intracellular and extracellular redox metabolic microenvironment is one of the critical factors for the maintenance of the niche. Cytochrome P450 reductase (CPR) is an obligate electron donor to all microsomal cytochrome P450 enzymes (P450 or CYP), and contributes to the redox metabolic process. However, its role in maintaining HSCs is unknown. Objective To examine the effects of low CPR expression on HSCs function using a mouse model of globally suppressed Cpr gene expression (Cpr Low, CL mice). Methods Hematopoietic cell subpopulations in bone marrow (BM) and peripheral blood (PB) from WT and CL mice were examined for their repopulation and differentiation ability upon BM competitive transplantation and enriched HSC (LKS+) transplantation. Effects of low CPR expression on hematopoiesis were examined by transplanting normal BM cells into CL recipients. Reactive oxygen species (ROS), cell cycle, and apoptosis in CL mice were analyzed by flow cytometry for DCF-DA fluorescence intensity, Ki67 protein, and Annexin-V, respectively. Results The levels of ROS in BM cells, HPCs and HSCs were comparable between CL and WT mice. In comparison to WT mice, the number of LT-HSCs or ST-HSCs was lower in CL mice while CMPs, GMPs and MEPs in CL mice were higher than that in WT control. Competitive transplantation assay revealed enhanced repopulation capacity of HSCs with low CPR expression, but no difference in differentiation potential upon in vitro experiments. Furthermore, lymphoid differentiation of donor cells decreased while their myeloid differentiation increased under CL microenvironment although the overall level of donor hematopoietic repopulation was not significantly altered. Conclusions Our studies demonstrate that suppressing CPR expression enhances the repopulation efficiency of HSCs and a low CPR expression microenvironment favors the differentiation of myeloid over lymphoid lineage cells.
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Affiliation(s)
- Yan Zhang
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Fang Dong
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Na Zhang
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Hui Cheng
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Yakun Pang
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Xiaomin Wang
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Jing Xu
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Xinxin Ding
- Wadsworth Center, New York State Department of Health, and School of Public Health, SUNY at Albany, Albany, New York, United States of America
| | - Tao Cheng
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Jun Gu
- Wadsworth Center, New York State Department of Health, and School of Public Health, SUNY at Albany, Albany, New York, United States of America
- * E-mail: (JG); (WY)
| | - Weiping Yuan
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing, China
- * E-mail: (JG); (WY)
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Liu S, Yao Y, Lu S, Aldous K, Ding X, Mei C, Gu J. The role of renal proximal tubule P450 enzymes in chloroform-induced nephrotoxicity: utility of renal specific P450 reductase knockout mouse models. Toxicol Appl Pharmacol 2013; 272:230-7. [PMID: 23732084 DOI: 10.1016/j.taap.2013.05.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Revised: 05/21/2013] [Accepted: 05/23/2013] [Indexed: 10/26/2022]
Abstract
The kidney is a primary target for numerous toxic compounds. Cytochrome P450 enzymes (P450) are responsible for the metabolic activation of various chemical compounds, and in the kidney are predominantly expressed in proximal tubules. The aim of this study was to test the hypothesis that renal proximal tubular P450s are critical for nephrotoxicity caused by chemicals such as chloroform. We developed two new mouse models, one having proximal tubule-specific deletion of the cytochrome P450 reductase (Cpr) gene (the enzyme required for all microsomal P450 activities), designated proximal tubule-Cpr-null (PTCN), and the other having proximal tubule-specific rescue of CPR activity with the global suppression of CPR activity in all extra-proximal tubular tissues, designated extra-proximal tubule-Cpr-low (XPT-CL). The PTCN, XPT-CL, Cpr-low (CL), and wild-type (WT) mice were treated with a single oral dose of chloroform at 200mg/kg. Blood, liver and kidney samples were obtained at 24h after the treatment. Renal toxicity was assessed by measuring BUN and creatinine levels, and by pathological examination. The blood and tissue levels of chloroform were determined. The severity of toxicity was less in PTCN and CL mice, compared with that of WT and XPT-CL mice. There were no significant differences in chloroform levels in the blood, liver, or kidney, between PTCN and WT mice, or between XPT-CL and CL mice. These findings indicate that local P450-dependent activities play an important role in the nephrotoxicity induced by chloroform. Our results also demonstrate the usefulness of these novel mouse models for studies of chemical-induced kidney toxicity.
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Affiliation(s)
- Senyan Liu
- Kidney Institute & Division of Nephrology, Changzheng Hospital, Shanghai 200003, China; Wadsworth Center, New York State Department of Health, and School of Public Health, State University of New York, Albany, NY 12201, USA
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Yao Y, Liu S, Wang Y, Yuan W, Ding X, Cheng T, Shen Q, Gu J. Suppression of cytochrome P450 reductase expression promotes astrocytosis in subventricular zone of adult mice. Neurosci Lett 2013; 548:84-9. [PMID: 23727388 DOI: 10.1016/j.neulet.2013.05.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Revised: 04/14/2013] [Accepted: 05/19/2013] [Indexed: 12/20/2022]
Abstract
The aim of this study was to determine the role of NADPH-cytochrome P450 reductase (CPR) and CPR-dependent enzymes in neural stem cell (NSC) genesis in the brain. A mouse model with globally suppressed Cpr gene expression (Cpr-low mouse) was studied for this purpose. Cpr-low and wild-type (WT) mice were compared immunohistochemically for the expression of markers of cell proliferation (Ki67), immature neurons (doublecortin, DCX), oligodendrocytes (oligodendrocyte transcription factor 2, OLIG2), and astrocytes (glial fibrillary acidic protein, GFAP) in the SVZ, and for the in vitro capability of their SVZ cells to form neurospheres and differentiate into astrocytes. We found that the abundance of SVZ cells that are positive for Ki67 or GFAP expression, but not the abundance of SVZ cells that are positive for DCX and OLIG2 expression, was significantly increased in Cpr-low mice, at various ages, compared with WT mice. Furthermore, extents of astrocyte differentiation and growth, but not neurosphere formation, from SVZ cells of the Cpr-low mice were significantly increased, compared with WT mice. These results suggest that CPR and CPR-dependent enzymes play a role in suppressing astrocytosis in the SVZ of adult mice.
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Affiliation(s)
- Yunyi Yao
- Research Center for Biochemistry and Molecular Biology, Jiangsu Key Laboratory of Brain Disease Bioinformation, Xuzhou Medical College, Xuzhou, Jiangsu 221004, China
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Zhang D, Luo G, Ding X, Lu C. Preclinical experimental models of drug metabolism and disposition in drug discovery and development. Acta Pharm Sin B 2012. [DOI: 10.1016/j.apsb.2012.10.004] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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Riddick DS, Ding X, Wolf CR, Porter TD, Pandey AV, Zhang QY, Gu J, Finn RD, Ronseaux S, McLaughlin LA, Henderson CJ, Zou L, Flück CE. NADPH-cytochrome P450 oxidoreductase: roles in physiology, pharmacology, and toxicology. Drug Metab Dispos 2012; 41:12-23. [PMID: 23086197 DOI: 10.1124/dmd.112.048991] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
This is a report on a symposium sponsored by the American Society for Pharmacology and Experimental Therapeutics and held at the Experimental Biology 2012 meeting in San Diego, California, on April 25, 2012. The symposium speakers summarized and critically evaluated our current understanding of the physiologic, pharmacological, and toxicological roles of NADPH-cytochrome P450 oxidoreductase (POR), a flavoprotein involved in electron transfer to microsomal cytochromes P450 (P450), cytochrome b(5), squalene mono-oxygenase, and heme oxygenase. Considerable insight has been derived from the development and characterization of mouse models with conditional Por deletion in particular tissues or partial suppression of POR expression in all tissues. Additional mouse models with global or conditional hepatic deletion of cytochrome b(5) are helping to clarify the P450 isoform- and substrate-specific influences of cytochrome b(5) on P450 electron transfer and catalytic function. This symposium also considered studies using siRNA to suppress POR expression in a hepatoma cell-culture model to explore the basis of the hepatic lipidosis phenotype observed in mice with conditional deletion of Por in liver. The symposium concluded with a strong translational perspective, relating the basic science of human POR structure and function to the impacts of POR genetic variation on human drug and steroid metabolism.
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Affiliation(s)
- David S Riddick
- Department of Pharmacology and Toxicology, Medical Sciences Building, University of Toronto, Toronto, Ontario, Canada M5S 1A8.
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Wei Y, Li L, Zhou X, Zhang QY, Dunbar A, Liu F, Kluetzman K, Yang W, Ding X. Generation and characterization of a novel Cyp2a(4/5)bgs-null mouse model. Drug Metab Dispos 2012; 41:132-40. [PMID: 23073733 DOI: 10.1124/dmd.112.048736] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Knockout mouse models targeting various cytochrome P450 (P450 or CYP) genes are valuable for determining P450's biologic functions, including roles in drug metabolism and chemical toxicity. In this study, a novel Cyp2a(4/5)bgs-null mouse model was generated, in which a 1.2-megabase pair genomic fragment containing nine Cyp genes in mouse chromosome 7 (including, sequentially, Cyp2a5, 2g1, 2b19, 2b23, 2a4, 2b9, 2b13, 2b10, and 2s1) are deleted, through Cre-mediated recombination in vivo. The resultant mouse strain was viable and fertile, without any developmental deficits or morphologic abnormalities. Deletion of the constitutive genes in the cluster was confirmed by polymerase chain reaction analysis of the genes and the mRNAs in tissues known to express each gene. The loss of this gene cluster led to significant decreases in microsomal activities toward testosterone hydroxylation in various tissues examined, including olfactory mucosa (OM), lung, liver, and brain. In addition, systemic clearance of pentobarbital was decreased in Cyp2a(4/5)bgs-null mice, as indicated by >60% increases in pentobarbital-induced sleeping time, compared with wild-type (WT) mice. This novel Cyp2a(4/5)bgs-null mouse model will be valuable for in vivo studies of drug metabolism and chemical toxicities in various tissues, including the liver, lung, brain, intestine, kidney, skin, and OM, where one or more of the targeted Cyp genes are known to be expressed in WT mice. The model will also be valuable for preparation of humanized mice that express human CYP2A6, CYP2A13, CYP2B6, or CYP2S1, and as a knockout mouse model for five non-P450 genes (Vmn1r184, Nalp9c, Nalp4a, Nalp9a, and Vmn1r185) that were also deleted.
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Affiliation(s)
- Yuan Wei
- Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201-0509, USA
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