2003 Fiscal Year Final Research Report Summary
Species differences in the regulation mechanisms between human and mouse carboxylesterase genes
| Project/Area Number |
14572090
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
医薬分子機能学
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| Research Institution | CHIBA UNIVERSITY |
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Principal Investigator |
HOSOKAWA Masakiyo Chiba University, Grad Sch. Pharmaceut Sci., Associate Professor, 大学院・薬学研究院, 助教授 (70181500)
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| Project Period (FY) |
2002 – 2003
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| Keywords | carboxylesterase / capillary endothelial cells / species differences / transcriptional mechanism / GC-Box / genome / transfactor / inverted duplication |
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| Research Abstract |
Mammalian carboxylesterase (CES) comprise a multigene family, which gene products are localized in the endoplasmic reticulum. We have recently described that major forms of CES in the human liver termed CES HU1 belongs to the CES1 family and that it is thought to play an important roles in drug and lipid metabolism. Since the expression level of CES HU1 may affect the level of chugs and lipid, it is important to understand the mechanism by which CES HU1 gene expression is regulated. In this study, we isolated the two CES genes encoding human CES HU1, which were tentatively designated as CES HU1a and CES HU1b. Both genes exist in inverted duplication on chromosome 16. These genes were completely similar, except for exon 1 and putative cis elements. The transcriptional level of CES HU1a was much higher than CES HU1b in human livers. Results of deletion assays and electrophoretic mobility shift assays suggested that the region from -160 to +54 consisted of the both gene promoters. However, Sp1 and GEBP interacted with the CES HU1a promoter, but not CES HU1b promoter. It was concluded that these two genes most probably arose from an early gene duplication event and that their highly conserved structures and difference in regulation at the transcriptional level argue strongly for a significant role for each gene product in cellular metabolism.
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Research Products
(10 results)
