Distal Promoter Regions Are Responsible for Differential Regulation of Human Orosomucoid-1 and -2 Gene Expression and Acute Phase Responses
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概要
- 論文の詳細を見る
Human orosomucoid (ORM) is a major acute-phase plasma protein, encoded by 2 highly homologous genes, ORM1 and ORM2. Human ORM induction is assumed to be regulated by each proximal promoter region, where putative glucocorticoid responsive elements and CCAAT/enhancer binding protein (C/EBP)β binding sites are located. However, the details of the differential regulation of these genes remain unknown. To explore this, we assessed the role of the distal promoter region of each ORM in HeLa cells. Luciferase-reporter activities of full constructs, containing approximately 1.1 kbp (FULL), and those of deletion constructs, containing up to 188 bp region (DEL) upstream of the transcription start sites of ORM1 and ORM2 were compared under both basal and inducer-treated conditions. For ORM1 and ORM2 DEL constructs, significantly increased activities after dexamethasone (DEX) treatments (alone and combined with interleukin (IL)-1β) were observed. Significantly higher FULL construct activities than DEL construct activities were observed for ORM1 after IL-1β treatment, while those for ORM2 were significantly lower at basal level and after DEX treatments. Upon C/EBPβ overexpression, FULL construct activities were significantly higher than those of DEL constructs at basal level and after IL-1β treatment for ORM1, and at basal level and after inducer-treatments for ORM2. Higher transcription-induction activity in the distal promoter region was evident for ORM1 in the absence of C/EBPβ overexpression, and for ORM2 under C/EBPβ overexpression conditions. These findings suggest that the ORM distal promoter region differentially regulates expression of ORM genes at basal level and in acute phase responses.
著者
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SAIJO Nagahiro
National Cancer Center Hospital East
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Sawada Jun-ichi
National Institute Of Health Sciences
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Okuda Haruhiro
National Institute of Health Sciences
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TAMURA Tomohide
National Cancer Center Hospital
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Saijo Nagahiro
National Cancer Center
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Tamura Tomohide
National Cancer Center
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YAMAMOTO Noboru
National Cancer Center Hospital
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SAITO Yoshiro
National Institute of Health Sciences
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MATSUMURA Yasuhiro
National Institute of Health and Nutrition
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KATORI Noriko
National Institute of Health Sciences
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Sai Kimie
National Institute Of Health Sciences
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Kurose Kouichi
National Institute of Health Sciences
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Koizumi Tomoko
National Institute of Health Sciences
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Matsumura Yasuhiro
National Cancer Center Hospital East
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