Transcriptional Regulation of CYP2B6 Expression by Hepatocyte Nuclear Factor 3β in Human Liver Cells.
CYP2B6 plays an increasingly important role in xenobiotic metabolism and detoxification. The constitutive androstane receptor (CAR) and the pregnane X receptor (PXR) have been established as predominant regulators for the inductive expression of CYP2B6 gene in human liver. However, there are dramati...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2016-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC4773089?pdf=render |
| _version_ | 1818281993002024960 |
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| author | Linhao Li Daochuan Li Scott Heyward Hongbing Wang |
| author_facet | Linhao Li Daochuan Li Scott Heyward Hongbing Wang |
| author_sort | Linhao Li |
| collection | DOAJ |
| description | CYP2B6 plays an increasingly important role in xenobiotic metabolism and detoxification. The constitutive androstane receptor (CAR) and the pregnane X receptor (PXR) have been established as predominant regulators for the inductive expression of CYP2B6 gene in human liver. However, there are dramatic interindividual variabilities in CYP2B6 expression that cannot be fully explained by the CAR/PXR-based modulation alone. Here, we show that expression level of CYP2B6 was correlated with that of hepatocyte nuclear factor 3β (HNF3β) in human primary hepatocytes prepared from 35 liver donors. Utilizing recombinant virus-mediated overexpression or knockdown of HNF3β in HepG2 cells, as well as constructs containing serial deletion and site-directed mutation of HNF3β binding motifs in CYP2B6 luciferase reporter assays, we demonstrated that the presence or lack of HNF3β expression markedly correlated with CYP2B6 gene expression and its promoter activity. Novel enhancer modules of HNF3β located upstream of the CYP2B6 gene transcription start site were identified and functionally validated as key elements governing HNF3β-mediated CYP2B6 expression. Chromatin immunoprecipitation assays in human primary hepatocytes and surface plasmon resonance binding affinity experiments confirmed the essential role of these enhancers in the recruitment of HNF3β to the promoter of CYP2B6 gene. Overall, these findings indicate that HNF3β represents a new liver enriched transcription factor that is involved in the transcription of CYP2B6 gene and contributes to the large interindividual variations of CYP2B6 expression in human population. |
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| id | doaj.art-36f0330d916a4a13ac4fc11de3f18d05 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-13T00:13:56Z |
| publishDate | 2016-01-01 |
| publisher | Public Library of Science (PLoS) |
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| spelling | doaj.art-36f0330d916a4a13ac4fc11de3f18d052022-12-22T00:05:51ZengPublic Library of Science (PLoS)PLoS ONE1932-62032016-01-01113e015058710.1371/journal.pone.0150587Transcriptional Regulation of CYP2B6 Expression by Hepatocyte Nuclear Factor 3β in Human Liver Cells.Linhao LiDaochuan LiScott HeywardHongbing WangCYP2B6 plays an increasingly important role in xenobiotic metabolism and detoxification. The constitutive androstane receptor (CAR) and the pregnane X receptor (PXR) have been established as predominant regulators for the inductive expression of CYP2B6 gene in human liver. However, there are dramatic interindividual variabilities in CYP2B6 expression that cannot be fully explained by the CAR/PXR-based modulation alone. Here, we show that expression level of CYP2B6 was correlated with that of hepatocyte nuclear factor 3β (HNF3β) in human primary hepatocytes prepared from 35 liver donors. Utilizing recombinant virus-mediated overexpression or knockdown of HNF3β in HepG2 cells, as well as constructs containing serial deletion and site-directed mutation of HNF3β binding motifs in CYP2B6 luciferase reporter assays, we demonstrated that the presence or lack of HNF3β expression markedly correlated with CYP2B6 gene expression and its promoter activity. Novel enhancer modules of HNF3β located upstream of the CYP2B6 gene transcription start site were identified and functionally validated as key elements governing HNF3β-mediated CYP2B6 expression. Chromatin immunoprecipitation assays in human primary hepatocytes and surface plasmon resonance binding affinity experiments confirmed the essential role of these enhancers in the recruitment of HNF3β to the promoter of CYP2B6 gene. Overall, these findings indicate that HNF3β represents a new liver enriched transcription factor that is involved in the transcription of CYP2B6 gene and contributes to the large interindividual variations of CYP2B6 expression in human population.http://europepmc.org/articles/PMC4773089?pdf=render |
| spellingShingle | Linhao Li Daochuan Li Scott Heyward Hongbing Wang Transcriptional Regulation of CYP2B6 Expression by Hepatocyte Nuclear Factor 3β in Human Liver Cells. PLoS ONE |
| title | Transcriptional Regulation of CYP2B6 Expression by Hepatocyte Nuclear Factor 3β in Human Liver Cells. |
| title_full | Transcriptional Regulation of CYP2B6 Expression by Hepatocyte Nuclear Factor 3β in Human Liver Cells. |
| title_fullStr | Transcriptional Regulation of CYP2B6 Expression by Hepatocyte Nuclear Factor 3β in Human Liver Cells. |
| title_full_unstemmed | Transcriptional Regulation of CYP2B6 Expression by Hepatocyte Nuclear Factor 3β in Human Liver Cells. |
| title_short | Transcriptional Regulation of CYP2B6 Expression by Hepatocyte Nuclear Factor 3β in Human Liver Cells. |
| title_sort | transcriptional regulation of cyp2b6 expression by hepatocyte nuclear factor 3β in human liver cells |
| url | http://europepmc.org/articles/PMC4773089?pdf=render |
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