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Wang Y, Wang P, Wang Q, Chen S, Wang X, Zhong X, Hu W, Thorne RF, Han S, Wu M, Zhang L. The long noncoding RNA HNF1A-AS1 with dual functions in the regulation of cytochrome P450 3A4. Biochem Pharmacol 2024; 220:116016. [PMID: 38176619 DOI: 10.1016/j.bcp.2023.116016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 12/21/2023] [Accepted: 12/28/2023] [Indexed: 01/06/2024]
Abstract
Cytochrome P450 3A4 (CYP3A4) is the most important and abundant drug-metabolizing enzyme in the human liver. Inter-individual differences in the expression and activity of CYP3A4 affect clinical and precision medicine. Increasing evidence indicates that long noncoding RNAs (lncRNAs) play crucial roles in the regulation of CYP3A4 expression. Here, we showed that lncRNA hepatocyte nuclear factor 1 alpha-antisense 1 (HNF1A-AS1) exerted dual functions in regulating CYP3A4 expression in Huh7 and HepG2 cells. Mechanistically, HNF1A-AS1 served as an RNA scaffold to interact with both protein arginine methyltransferase 1 and pregnane X receptor (PXR), thereby facilitating their protein interactions and resulting in the transactivation of PXR and transcriptional alteration of CYP3A4 via histone modifications. Furthermore, HNF1A-AS1 bound to the HNF1A protein, a liver-specific transcription factor, thereby blocking its interaction with the E3 ubiquitin ligase tripartite motif containing 25, ultimately preventing HNF1A ubiquitination and protein degradation, further regulating the expression of CYP3A4. In summary, these results reveal the novel functions of HNF1A-AS1 as the transcriptional and post-translational regulator of CYP3A4; thus, HNF1A-AS1 may serve as a new indicator for establishing or predicting individual differences in CYP3A4 expression.
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Affiliation(s)
- Yiting Wang
- Department of Pharmacology, School of Basic Medical Sciences, Academy of Medical Science, Zhengzhou University, Zhengzhou, 450001 Zhengzhou, China; Department of Clinical Pharmacology, School of Medicine, Henan University of Chinese Medicine, 450046 Zhengzhou, China
| | - Pei Wang
- Department of Pharmacology, School of Basic Medical Sciences, Academy of Medical Science, Zhengzhou University, Zhengzhou, 450001 Zhengzhou, China
| | - Qi Wang
- Department of Pharmacology, School of Basic Medical Sciences, Academy of Medical Science, Zhengzhou University, Zhengzhou, 450001 Zhengzhou, China
| | - Shitong Chen
- Department of Pharmacology, School of Basic Medical Sciences, Academy of Medical Science, Zhengzhou University, Zhengzhou, 450001 Zhengzhou, China
| | - Xiaofei Wang
- Department of Pharmacology, School of Basic Medical Sciences, Academy of Medical Science, Zhengzhou University, Zhengzhou, 450001 Zhengzhou, China
| | - Xiaobo Zhong
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, 06269 Storrs, CT, USA
| | - Wanglai Hu
- Translational Research Institute, Zhengzhou University People's Hospital, Academy of Medical Science, Zhengzhou University, 450003 Zhengzhou, China
| | - Rick F Thorne
- Translational Research Institute, Zhengzhou University People's Hospital, Academy of Medical Science, Zhengzhou University, 450003 Zhengzhou, China
| | - Shengna Han
- Department of Pharmacology, School of Basic Medical Sciences, Academy of Medical Science, Zhengzhou University, Zhengzhou, 450001 Zhengzhou, China.
| | - Mian Wu
- Translational Research Institute, Zhengzhou University People's Hospital, Academy of Medical Science, Zhengzhou University, 450003 Zhengzhou, China.
| | - Lirong Zhang
- Department of Pharmacology, School of Basic Medical Sciences, Academy of Medical Science, Zhengzhou University, Zhengzhou, 450001 Zhengzhou, China.
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Predicting Prognosis and Platinum Resistance in Ovarian Cancer: Role of Immunohistochemistry Biomarkers. Int J Mol Sci 2023; 24:ijms24031973. [PMID: 36768291 PMCID: PMC9916805 DOI: 10.3390/ijms24031973] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/17/2022] [Accepted: 12/20/2022] [Indexed: 01/20/2023] Open
Abstract
Ovarian cancer is a lethal reproductive tumour affecting women worldwide. The advancement in presentation and occurrence of chemoresistance are the key factors for poor survival among ovarian cancer women. Surgical debulking was the mainstay of systemic treatment for ovarian cancer, which was followed by a successful start to platinum-based chemotherapy. However, most women develop platinum resistance and relapse within six months of receiving first-line treatment. Thus, there is a great need to identify biomarkers to predict platinum resistance before enrolment into chemotherapy, which would facilitate individualized targeted therapy for these subgroups of patients to ensure better survival and an improved quality of life and overall outcome. Harnessing the immune response through immunotherapy approaches has changed the treatment way for patients with cancer. The immune outline has emerged as a beneficial tool for recognizing predictive and prognostic biomarkers clinically. Studying the tumour microenvironment (TME) of ovarian cancer tissue may provide awareness of actionable targets for enhancing chemotherapy outcomes and quality of life. This review analyses the relevance of immunohistochemistry biomarkers as prognostic biomarkers in predicting chemotherapy resistance and improving the quality of life in ovarian cancer.
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Liu F, Zhu X, Jiang X, Li S, Lv Y. Transcriptional control by HNF-1: Emerging evidence showing its role in lipid metabolism and lipid metabolism disorders. Genes Dis 2022; 9:1248-1257. [PMID: 35873023 DOI: 10.1016/j.gendis.2021.06.010.ecollection] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/10/2021] [Accepted: 06/29/2021] [Indexed: 05/25/2023] Open
Abstract
The present review focuses on the roles and underlying mechanisms of action of hepatic nuclear factor-1 (HNF-1) in lipid metabolism and the development of lipid metabolism disorders. HNF-1 is a transcriptional regulator that can form homodimers, and the HNF-1α and HNF-1β isomers can form heterodimers. Both homo- and heterodimers recognize and bind to specific cis-acting elements in gene promoters to transactivate transcription and to coordinate the expression of target lipid-related genes, thereby influencing the homeostasis of lipid metabolism. HNF-1 was shown to restrain lipid anabolism, including synthesis, absorption, and storage, by inhibiting the expression of lipogenesis-related genes, such as peroxisome proliferator-activated receptor γ (PPARγ) and sterol regulatory element-binding protein-1/2 (SREBP-1/2). Moreover, HNF-1 enhances the expression of various genes, such as proprotein convertase subtilisin/kexin type 9 (PCSK9), glutathione peroxidase 1 (GPx1), and suppressor of cytokine signaling-3 (SOCS-3) and negatively regulates signal transducer and activator of transcription (STAT) to facilitate lipid catabolism in hepatocytes. HNF-1 reduces hepatocellular lipid decomposition, which alleviates the progression of nonalcoholic fatty liver disease (NAFLD). HNF-1 impairs preadipocyte differentiation to reduce the number of adipocytes, stunting the development of obesity. Furthermore, HNF-1 reduces free cholesterol levels in the plasma to inhibit aortic lipid deposition and lipid plaque formation, relieving dyslipidemia and preventing the development of atherosclerotic cardiovascular disease (ASCVD). In summary, HNF-1 transcriptionally regulates lipid-related genes to manipulate intracorporeal balance of lipid metabolism and to suppress the development of lipid metabolism disorders.
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Affiliation(s)
- Fang Liu
- Guangxi Key Laboratory of Diabetic Systems Medicine, Guangxi Province Postgraduate Co-training Base for Cooperative Innovation in Basic Medicine (Guilin Medical University and Yueyang Women & Children's Medical Center), Guilin Medical University, Guilin, Guangxi 541199, PR China
| | - Xiao Zhu
- Guangxi Key Laboratory of Diabetic Systems Medicine, Guangxi Province Postgraduate Co-training Base for Cooperative Innovation in Basic Medicine (Guilin Medical University and Yueyang Women & Children's Medical Center), Guilin Medical University, Guilin, Guangxi 541199, PR China
| | - Xiaping Jiang
- Guangxi Key Laboratory of Diabetic Systems Medicine, Guangxi Province Postgraduate Co-training Base for Cooperative Innovation in Basic Medicine (Guilin Medical University and Yueyang Women & Children's Medical Center), Guilin Medical University, Guilin, Guangxi 541199, PR China
| | - Shan Li
- Guangxi Key Laboratory of Diabetic Systems Medicine, Guangxi Province Postgraduate Co-training Base for Cooperative Innovation in Basic Medicine (Guilin Medical University and Yueyang Women & Children's Medical Center), Guilin Medical University, Guilin, Guangxi 541199, PR China
| | - Yuncheng Lv
- Guangxi Key Laboratory of Diabetic Systems Medicine, Guangxi Province Postgraduate Co-training Base for Cooperative Innovation in Basic Medicine (Guilin Medical University and Yueyang Women & Children's Medical Center), Guilin Medical University, Guilin, Guangxi 541199, PR China
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Machado DA, Ontiveros AE, Behringer RR. Mammalian uterine morphogenesis and variations. Curr Top Dev Biol 2022; 148:51-77. [DOI: 10.1016/bs.ctdb.2021.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Liu F, Zhu X, Jiang X, Li S, Lv Y. Transcriptional control by HNF-1: Emerging evidence showing its role in lipid metabolism and lipid metabolism disorders. Genes Dis 2021; 9:1248-1257. [PMID: 35873023 PMCID: PMC9293700 DOI: 10.1016/j.gendis.2021.06.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/10/2021] [Accepted: 06/29/2021] [Indexed: 11/13/2022] Open
Abstract
The present review focuses on the roles and underlying mechanisms of action of hepatic nuclear factor-1 (HNF-1) in lipid metabolism and the development of lipid metabolism disorders. HNF-1 is a transcriptional regulator that can form homodimers, and the HNF-1α and HNF-1β isomers can form heterodimers. Both homo- and heterodimers recognize and bind to specific cis-acting elements in gene promoters to transactivate transcription and to coordinate the expression of target lipid-related genes, thereby influencing the homeostasis of lipid metabolism. HNF-1 was shown to restrain lipid anabolism, including synthesis, absorption, and storage, by inhibiting the expression of lipogenesis-related genes, such as peroxisome proliferator-activated receptor γ (PPARγ) and sterol regulatory element-binding protein-1/2 (SREBP-1/2). Moreover, HNF-1 enhances the expression of various genes, such as proprotein convertase subtilisin/kexin type 9 (PCSK9), glutathione peroxidase 1 (GPx1), and suppressor of cytokine signaling-3 (SOCS-3) and negatively regulates signal transducer and activator of transcription (STAT) to facilitate lipid catabolism in hepatocytes. HNF-1 reduces hepatocellular lipid decomposition, which alleviates the progression of nonalcoholic fatty liver disease (NAFLD). HNF-1 impairs preadipocyte differentiation to reduce the number of adipocytes, stunting the development of obesity. Furthermore, HNF-1 reduces free cholesterol levels in the plasma to inhibit aortic lipid deposition and lipid plaque formation, relieving dyslipidemia and preventing the development of atherosclerotic cardiovascular disease (ASCVD). In summary, HNF-1 transcriptionally regulates lipid-related genes to manipulate intracorporeal balance of lipid metabolism and to suppress the development of lipid metabolism disorders.
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Patil PA, Taddei T, Jain D, Zhang X. HNF-1β is a More Sensitive and Specific Marker Than C-Reactive Protein for Identifying Biliary Differentiation in Primary Hepatic Carcinomas. Arch Pathol Lab Med 2021; 146:220-226. [PMID: 34086854 DOI: 10.5858/arpa.2020-0725-oa] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/18/2021] [Indexed: 02/05/2023]
Abstract
CONTEXT.— Intrahepatic cholangiocarcinoma (iCCA) needs to be distinguished from hepatocellular carcinoma (HCC) and metastasis, and in the absence of any specific biliary markers, is often a diagnosis of exclusion. Hepatocyte nuclear factor (HNF)-1β is a transcription factor that plays a critical role in bile duct system morphogenesis. OBJECTIVE.— To investigate the diagnostic value of HNF-1β to differentiate iCCA from HCC by immunohistochemistry and compare HNF-1β with C-reactive protein (CRP), a previously identified marker for iCCA. DESIGN.— Cases of iCCA (n = 75), combined hepatocellular-cholangiocarcinoma (cHCC-CCA) (n = 13) and HCC (n = 65) were included in the study. RESULTS.— All cases of iCCA (74 of 74, 100%) expressed HNF-1β compared with CRP expressed in 72.60% (53 of 73). The sensitivity and specificity of HNF-1β to differentiate iCCA from HCC was 100% and 92.31%, whereas the sensitivity and specificity for CRP was 75.58% and 7.79%. The expression of HNF-1β was greater in iCCA and the CCA component of cHCC-CCA compared with CRP (87 of 87, 100% versus 65 of 86, 75.58%, P < .001). On the contrary, CRP was more frequently expressed compared with HNF-1β in HCC and HCC component of cHCC-CCA (71 of 77, 92.21% versus 6 of 78, 7.69%; P < .001). CONCLUSIONS.— Our data indicate that HNF-1β is a more sensitive and specific marker than CRP for the diagnosis of iCCA and to identify the CCA component in cHCC-CCA. Lack of HNF-1β expression may be used to exclude iCCA from consideration in cases of adenocarcinomas of unknown primary.
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Affiliation(s)
- Pallavi A Patil
- From the Department of Pathology (Patil, Jain, Zhang), Yale University School of Medicine, New Haven, Connecticut.,Patil is currently located in the Department of Pathology at the University of South Alabama, in Mobile, Alabama
| | - Tamar Taddei
- Section of Digestive Diseases (Taddei), Yale University School of Medicine, New Haven, Connecticut
| | - Dhanpat Jain
- From the Department of Pathology (Patil, Jain, Zhang), Yale University School of Medicine, New Haven, Connecticut
| | - Xuchen Zhang
- From the Department of Pathology (Patil, Jain, Zhang), Yale University School of Medicine, New Haven, Connecticut
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HNF1β is a sensitive and specific novel marker for yolk sac tumor: a tissue microarray analysis of 601 testicular germ cell tumors. Mod Pathol 2020; 33:2354-2360. [PMID: 32561848 DOI: 10.1038/s41379-020-0597-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 06/04/2020] [Accepted: 06/05/2020] [Indexed: 12/15/2022]
Abstract
Hepatocyte Nuclear Factor 1 beta (HNF1β) is a transcription factor which plays an important role during early organogenesis, especially of the pancreato-biliary and urogenital tract. Furthermore, HNF1β is an established marker in the differential diagnosis of ovarian cancer and shows a distinct nuclear expression in the clear cell carcinoma subtype. Recently, it has been described in yolk sac tumor, which represents a common component in many non-seminomatous germ cell tumors. Due to its broad histologic diversity, the diagnosis may be challenging and additional tools are very helpful in the workup of germ cell tumors. Immunohistochemistry was used to study HNF1β expression in a tissue microarray (TMA) of 601 testicular germ cell tumors including seminoma, embryonal carcinoma, yolk sac tumor, choriocarcinoma, teratoma, germ cell neoplasia in situ (GCNIS), and normal tissue. The expression pattern was compared to glypican 3 (GPC3) and α-fetoprotein (AFP), two markers currently in use for the detection of yolk sac tumor. HNF1β showed a distinct nuclear staining in comparison to the cytoplasmic pattern of GPC3 and AFP. The sensitivity and specificity of HNF1β were 85.4% and 96.5%, of GPC3 83.3% and 90.7%, of AFP 62.5% and 97.7%. We conclude that HNF1β allows a reliable distinction of yolk sac tumor from other germ cell tumor components. Therefore, we propose HNF1β as a novel and robust marker in the immunohistochemical workup of testicular germ cell tumors.
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Genotype and Phenotype Analyses in Pediatric Patients with HNF1B Mutations. J Clin Med 2020; 9:jcm9072320. [PMID: 32708349 PMCID: PMC7408390 DOI: 10.3390/jcm9072320] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 07/15/2020] [Accepted: 07/17/2020] [Indexed: 01/01/2023] Open
Abstract
HNF1B mutations, one of the most common causes of congenital anomalies of the kidney and urinary tract, manifest as various renal and extrarenal phenotypes. We analyzed the genotype-phenotype correlations in 14 pediatric patients with HNF1B mutations. Genetic studies revealed total gene deletion in six patients (43%). All patients had bilateral renal abnormalities, primarily multiple renal cysts. Twelve patients exhibited progressive renal functional deterioration, and six of them progressed to kidney failure. The annual reduction in estimated glomerular filtration rate was−2.1 mL/min/1.73 m2. Diabetes developed in five patients (36%), including one patient with new-onset diabetes after transplantation. Neurological deficits were noted in three patients (21%), one with total gene deletion and two with missense mutations. Pancreatic abnormalities were more frequent in patients with missense mutations than in patients with other types of mutations. Genotype showed no significant correlation with renal outcomes or other extrarenal manifestations. The HNF1B scores at the times of onset and genetic diagnosis were <8 in two patients and one patient, respectively. Diagnosis of HNF1B mutations is clinically difficult because of extreme phenotypic variability and incomplete penetrance. Furthermore, some phenotypes develop with age. Therefore, patient age should be taken into consideration to increase the diagnostic rate, because some phenotypes develop with age.
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Defective functions of HNF1A variants on BCL2L1 transactivation and beta-cell growth. Biochem Biophys Res Commun 2020; 529:826-833. [PMID: 32684311 DOI: 10.1016/j.bbrc.2020.05.155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 05/20/2020] [Indexed: 10/23/2022]
Abstract
Maturity-onset diabetes of the young type 3 (MODY3) is caused by mutations in a gene encoding transcription factor hepatocyte nuclear factor 1-alpha (HNF1A). Although the roles of HNF1A in regulation of hepatic and pancreatic genes to maintain glucose homeostasis were investigated, the functions of HNF1A are not completely elucidated. To better understand the functions of HNF1A, we characterized mutations of HNF1A in Thai MODY3 patients and studied the functions of wild-type HNF1A and variant proteins. We demonstrate for the first time that HNF1A upregulates transactivation of an anti-apoptotic gene BCL2 Like 1 (BCL2L1) and that all the identified HNF1A variants including p.D80V, p.R203C, p.P475L, and p.G554fsX556, reduce this ability. The four HNF1A variants impair HNF1A function in promoting INS-1 cell transition from G1 to S phase of cell cycle, which thereby retard cell growth. This finding indicates the role of HNF1A in beta-cell viability by upregulation of anti-apoptotic gene expression and also reaffirms its role in beta-cell growth through cell cycle control.
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Abdelwahed M, Chaabouni Y, Michel-Calemard L, Chaabouni K, Morel Y, Hachicha J, Makni FA, Kamoun H, Ammar-Keskes L, Belghith N. A novel disease-causing mutation in the Renin gene in a Tunisian family with autosomal dominant tubulointerstitial kidney disease. Int J Biochem Cell Biol 2019; 117:105625. [DOI: 10.1016/j.biocel.2019.105625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 09/24/2019] [Accepted: 09/30/2019] [Indexed: 01/24/2023]
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Lopes‐Coelho F, Silva F, Hipólito A, Cardoso BA, Serpa J. Acetylation drives hepatocyte nuclear factor 1β stability by blocking proteasome‐mediated degradation. J Cell Biochem 2018; 120:9337-9344. [DOI: 10.1002/jcb.28209] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 11/15/2018] [Indexed: 12/11/2022]
Affiliation(s)
- Filipa Lopes‐Coelho
- CEDOC, Chronic Diseases Research Centre, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Campo dos Mártires da Pátria Lisboa Portugal
- Unidade de Investigação em Patobiologia Molecular do Instituto Português de Oncologia de Lisboa Francisco Gentil (IPOLFG) Lisboa Portugal
| | - Fernanda Silva
- CEDOC, Chronic Diseases Research Centre, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Campo dos Mártires da Pátria Lisboa Portugal
- Unidade de Investigação em Patobiologia Molecular do Instituto Português de Oncologia de Lisboa Francisco Gentil (IPOLFG) Lisboa Portugal
| | - Ana Hipólito
- CEDOC, Chronic Diseases Research Centre, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Campo dos Mártires da Pátria Lisboa Portugal
- Unidade de Investigação em Patobiologia Molecular do Instituto Português de Oncologia de Lisboa Francisco Gentil (IPOLFG) Lisboa Portugal
| | - Bruno A. Cardoso
- CEDOC, Chronic Diseases Research Centre, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Campo dos Mártires da Pátria Lisboa Portugal
- Unidade de Investigação em Patobiologia Molecular do Instituto Português de Oncologia de Lisboa Francisco Gentil (IPOLFG) Lisboa Portugal
| | - Jacinta Serpa
- CEDOC, Chronic Diseases Research Centre, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Campo dos Mártires da Pátria Lisboa Portugal
- Unidade de Investigação em Patobiologia Molecular do Instituto Português de Oncologia de Lisboa Francisco Gentil (IPOLFG) Lisboa Portugal
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Yang MX, Coates RF, Ambaye A, Gardner JA, Zubarick R, Gao Y, Skelly J, Liu JG, Mino-Kenudson M. Investigation of HNF-1B as a diagnostic biomarker for pancreatic ductal adenocarcinoma. Biomark Res 2018; 6:25. [PMID: 30065837 PMCID: PMC6062876 DOI: 10.1186/s40364-018-0139-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 07/19/2018] [Indexed: 12/13/2022] Open
Abstract
Background Diagnosing pancreatic ductal adenocarcinoma (PDAC) in the setting of metastasis with an unknown primary remains very challenging due to the lack of specific biomarkers. HNF-1B has been characterized as an important transcription factor for pancreatic development and was reported as a biomarker for clear cell subtype of PDAC. Methods To investigate the diagnostic role of HNF-1B for PDAC, we used tissue microarray (TMA) and immunohistochemistry (IHC) to characterize HNF-1B expression in a large cohort of carcinomas, including 127 primary PDACs, 47 biliary adenocarcinomas, 17 metastatic PDACs, and 231 non-pancreaticobiliary carcinomas. Results HNF-1B was expressed in 107 of 127 (84.3%) of PDACs, 13 of 15 (86.7%) of cholangiocarcinomas, 13 of 18 (72%) of ampullary carcinomas, and 13 of 14 (92.9%) of gallbladder adenocarcinomas. Notably, HNF-1B was expressed in 16 of 17 (94.1%) of metastatic PDACs. Among the non-pancreaticobiliary cancers, HNF-1B was expressed in ~ 77% clear cell carcinomas of the kidney and ovarian clear cell carcinomas. Gastroesophageal, lung, and prostate adenocarcinomas occasionally expressed HNF-1B in up to 37% cases. HNF-1B was completely negative in hepatocellular, colorectal, breast, and lung squamous cell carcinomas. The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of HNF-1B for primary pancreaticobiliary carcinoma is 84, 68, 66, 85, and 75%, respectively. HNF-1B expression was not significantly associated with overall survival in patients with PDAC, but tumor size ≥2 cm and high tumor grade were significantly associated with worse overall survival in multivariate analyses. Conclusions HNF-1B may be used in surgical pathology to aid the diagnosis of metastatic pancreatic and biliary carcinoma with a panel of other markers to exclude lung, kidney, prostate, and Müllerian origins.
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Affiliation(s)
- Michelle X Yang
- 1Department of Pathology and Laboratory Medicine, University of Vermont Medical Center, 111 Colchester Avenue, Burlington, VT USA.,7Present address: Department of Pathology, University of Massachusetts Medical Center, 1 Innovation Drive, Worcester, MA 01605 USA
| | - Ryan F Coates
- 1Department of Pathology and Laboratory Medicine, University of Vermont Medical Center, 111 Colchester Avenue, Burlington, VT USA
| | - Abiy Ambaye
- 1Department of Pathology and Laboratory Medicine, University of Vermont Medical Center, 111 Colchester Avenue, Burlington, VT USA
| | - Juli-Anne Gardner
- 1Department of Pathology and Laboratory Medicine, University of Vermont Medical Center, 111 Colchester Avenue, Burlington, VT USA
| | - Richard Zubarick
- 2Gastroenterology, University of Vermont Medical Center, 111 Colchester Avenue, Burlington, VT USA
| | - Yuan Gao
- Department of Gastrointestinal Surgery, Nanjing Medical University affiliated Changzhou 2nd People's Hospital, Changzhou, Jiangsu China
| | - Joan Skelly
- 4University of Vermont Medical Biostatistics Department, Burlington, VT USA
| | - James G Liu
- Applied Pathology Systems, Worcester, MA USA
| | - Mari Mino-Kenudson
- 6Department of Pathology, Massachusetts General Hospital, Boston, MA USA
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Al-Khawaga S, Memon B, Butler AE, Taheri S, Abou-Samra AB, Abdelalim EM. Pathways governing development of stem cell-derived pancreatic β cells: lessons from embryogenesis. Biol Rev Camb Philos Soc 2017. [DOI: 10.1111/brv.12349] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sara Al-Khawaga
- Diabetes Research Center, Qatar Biomedical Research Institute; Hamad Bin Khalifa University, Qatar Foundation, Education City; Doha Qatar
| | - Bushra Memon
- Diabetes Research Center, Qatar Biomedical Research Institute; Hamad Bin Khalifa University, Qatar Foundation, Education City; Doha Qatar
| | - Alexandra E. Butler
- Larry L. Hillblom Islet Research Center, David Geffen School of Medicine; University of California; Los Angeles CA 90095 U.S.A
| | - Shahrad Taheri
- Department of Medicine; Weill Cornell Medicine in Qatar, Qatar Foundation, Education City, PO BOX 24144; Doha Qatar
- Department of Medicine; Qatar Metabolic Institute, Hamad Medical Corporation; Doha Qatar
| | - Abdul B. Abou-Samra
- Department of Medicine; Weill Cornell Medicine in Qatar, Qatar Foundation, Education City, PO BOX 24144; Doha Qatar
- Department of Medicine; Qatar Metabolic Institute, Hamad Medical Corporation; Doha Qatar
| | - Essam M. Abdelalim
- Diabetes Research Center, Qatar Biomedical Research Institute; Hamad Bin Khalifa University, Qatar Foundation, Education City; Doha Qatar
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Genetic risk factors for ovarian cancer and their role for endometriosis risk. Gynecol Oncol 2017; 145:142-147. [PMID: 28214017 DOI: 10.1016/j.ygyno.2017.02.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 02/09/2017] [Accepted: 02/10/2017] [Indexed: 02/08/2023]
Abstract
OBJECTIVE Several genetic variants have been validated as risk factors for ovarian cancer. Endometriosis has also been described as a risk factor for ovarian cancer. Identifying genetic risk factors that are common to the two diseases might help improve our understanding of the molecular pathogenesis potentially linking the two conditions. METHODS In a hospital-based case-control analysis, 12 single nucleotide polymorphisms (SNPs), validated by the Ovarian Cancer Association Consortium (OCAC) and the Collaborative Oncological Gene-environment Study (COGS) project, were genotyped using TaqMan® OpenArray™ analysis. The cases consisted of patients with endometriosis, and the controls were healthy individuals without endometriosis. A total of 385 cases and 484 controls were analyzed. Odds ratios and P values were obtained using simple logistic regression models, as well as from multiple logistic regression models with adjustment for clinical predictors. RESULTS rs11651755 in HNF1B was found to be associated with endometriosis in this case-control study. The OR was 0.66 (95% CI, 0.51 to 0.84) and the P value after correction for multiple testing was 0.01. None of the other genotypes was associated with a risk for endometriosis. CONCLUSIONS As rs11651755 in HNF1B modified both the ovarian cancer risk and also the risk for endometriosis, HNF1B may be causally involved in the pathogenetic pathway leading from endometriosis to ovarian cancer.
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Prenatal diagnosis of familial transmission of 17q12 microduplication associated with no apparent phenotypic abnormality. Taiwan J Obstet Gynecol 2017; 55:871-873. [PMID: 28040137 DOI: 10.1016/j.tjog.2016.08.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/30/2016] [Indexed: 01/05/2023] Open
Abstract
OBJECTIVE We present prenatal diagnosis of familial transmission of 17q12 duplication associated with no apparent phenotypic abnormality. CASE REPORT A 36-year-old woman underwent amniocentesis at 17 weeks of gestation because of advanced maternal age. Cytogenetic analysis revealed a karyotype of 46,XY. Array comparative genomic hybridization of uncultured amniocytes revealed a 1.42-Mb duplication of 17q12 or arr 17q12 (34,822,465-36,243,365) × 3 encompassing 12 Online Mendelian Inheritance in Man (OMIM) genes including LHX1, ACACA, and HNF1B. Array comparative genomic hybridization analysis of parental bloods revealed no genomic imbalance in the mother, and a result of arr 17q12 (34,611,377-36,248,889) × 2.9 encompassing 16 OMIM genes, including LHX1, ACACA, and HNF1B, in the 29-year-old phenotypically normal father. Prenatal ultrasound findings were unremarkable. The parents elected to continue the pregnancy. At 37 weeks of gestation, a 2789-g normal male baby was delivered uneventfully. When examined at the age of 7 months, the neonate was as phenotypically normal as his father. CONCLUSION The 17q12 microduplication may present with variable phenotypes including no apparent phenotypic abnormality in familial cases. However, neuropsychiatry assessment and monitoring should be warranted in childhood and through adulthood under such a circumstance.
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Wiedmann MM, Aibara S, Spring DR, Stewart M, Brenton JD. Structural and calorimetric studies demonstrate that the hepatocyte nuclear factor 1β (HNF1β) transcription factor is imported into the nucleus via a monopartite NLS sequence. J Struct Biol 2016; 195:273-281. [PMID: 27346421 PMCID: PMC4991853 DOI: 10.1016/j.jsb.2016.06.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 06/20/2016] [Accepted: 06/21/2016] [Indexed: 02/03/2023]
Abstract
The transcription factor hepatocyte nuclear factor 1β (HNF1β) is ubiquitously overexpressed in ovarian clear cell carcinoma (CCC) and is a potential therapeutic target. To explore potential approaches that block HNF1β transcription we have identified and characterised extensively the nuclear localisation signal (NLS) for HNF1β and its interactions with the nuclear protein import receptor, Importin-α. Pull-down assays demonstrated that the DNA binding domain of HNF1β interacted with a spectrum of Importin-α isoforms and deletion constructs tagged with eGFP confirmed that the HNF1β (229)KKMRRNR(235) sequence was essential for nuclear localisation. We further characterised the interaction between the NLS and Importin-α using complementary biophysical techniques and have determined the 2.4Å resolution crystal structure of the HNF1β NLS peptide bound to Importin-α. The functional, biochemical, and structural characterisation of the nuclear localisation signal present on HNF1β and its interaction with the nuclear import protein Importin-α provide the basis for the development of compounds targeting transcription factor HNF1β via its nuclear import pathway.
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Affiliation(s)
- Mareike M Wiedmann
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK; Cancer Research UK Cambridge Institute, University of Cambridge, Li Ka Shing Centre, Robinson Way, Cambridge CB2 0RE, UK
| | - Shintaro Aibara
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK
| | - David R Spring
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Murray Stewart
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK.
| | - James D Brenton
- Cancer Research UK Cambridge Institute, University of Cambridge, Li Ka Shing Centre, Robinson Way, Cambridge CB2 0RE, UK
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17
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Perillo M, Wang YJ, Leach SD, Arnone MI. A pancreatic exocrine-like cell regulatory circuit operating in the upper stomach of the sea urchin Strongylocentrotus purpuratus larva. BMC Evol Biol 2016; 16:117. [PMID: 27230062 PMCID: PMC4880809 DOI: 10.1186/s12862-016-0686-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 05/12/2016] [Indexed: 12/22/2022] Open
Abstract
Background Digestive cells are present in all metazoans and provide the energy necessary for the whole organism. Pancreatic exocrine cells are a unique vertebrate cell type involved in extracellular digestion of a wide range of nutrients. Although the organization and regulation of this cell type is intensively studied in vertebrates, its evolutionary history is still unknown. In order to understand which are the elements that define the pancreatic exocrine phenotype, we have analyzed the expression of genes that contribute to specification and function of this cell-type in an early branching deuterostome, the sea urchin Strongylocentrotus purpuratus. Results We defined the spatial and temporal expression of sea urchin orthologs of pancreatic exocrine genes and described a unique population of cells clustered in the upper stomach of the sea urchin embryo where exocrine markers are co-expressed. We used a combination of perturbation analysis, drug and feeding experiments and found that in these cells of the sea urchin embryo gene expression and gene regulatory interactions resemble that of bona fide pancreatic exocrine cells. We show that the sea urchin Ptf1a, a key transcriptional activator of digestive enzymes in pancreatic exocrine cells, can substitute for its vertebrate ortholog in activating downstream genes. Conclusions Collectively, our study is the first to show with molecular tools that defining features of a vertebrate cell-type, the pancreatic exocrine cell, are shared by a non-vertebrate deuterostome. Our results indicate that the functional cell-type unit of the vertebrate pancreas may evolutionarily predate the emergence of the pancreas as a discrete organ. From an evolutionary perspective, these results encourage to further explore the homologs of other vertebrate cell-types in traditional or newly emerging deuterostome systems. Electronic supplementary material The online version of this article (doi:10.1186/s12862-016-0686-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Margherita Perillo
- Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Napoli, 80121, Italy.,Present address: Department of Biology, Boston College, Chestnut Hill, MA, USA
| | - Yue Julia Wang
- Department of Surgery and the McKusick Nathans Institute for Genetic Medicine, Johns Hopkins University, Baltimore, MD, 21205, USA
| | - Steven D Leach
- Department of Surgery and the McKusick Nathans Institute for Genetic Medicine, Johns Hopkins University, Baltimore, MD, 21205, USA
| | - Maria Ina Arnone
- Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Napoli, 80121, Italy.
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Knebel B, Mack S, Haas J, Herman-Friede MK, Lange S, Schubert O, Kotzka J, Muller-Wieland D. Divergent phenotypes in siblings with identical novel mutations in the HNF-1α gene leading to maturity onset diabetes of the young type 3. BMC MEDICAL GENETICS 2016; 17:36. [PMID: 27142837 PMCID: PMC4855429 DOI: 10.1186/s12881-016-0297-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 04/15/2016] [Indexed: 12/28/2022]
Abstract
BACKGROUND Maturity onset diabetes of the young (MODY) is an autosomal dominant form of non-insulin-dependent diabetes mellitus caused by mutations in at least 13 different genes. The hepatocyte nuclear factor (HNF)-1α gene is affected in the most common form (HNF1A-MODY [MODY3]). CASE PRESENTATION We describe the co-inheritance of a novel heterozygous missense mutation c.1761C > G (p.Pro588Ala) with a novel complex deletion insertion mutation (c.1765_1766delinsGCCCGfs86*) in the HNF-1α gene among affected members of one family. Both mutations were present in the affected patients and neither was present in unaffected family members. The family had not only inheritance of MODY but also increased susceptibility to type 2 diabetes. Therefore one family member had classical type 2 diabetes including metabolic syndrome aggravated by a genetic predisposition in the form of HNF1A-MODY. CONCLUSION The presence of common type 2 diabetes features should not detract from the possibility of MODY in patients with a striking autosomal-dominant family history.
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Affiliation(s)
- Birgit Knebel
- Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center at the Heinrich-Heine-University Duesseldorf, Leibniz Center for Diabetes Research, Duesseldorf, Germany
| | - Susanne Mack
- Institute for Diabetes Research, Department of General Internal Medicine, Asklepios Clinic St. Georg, Asklepios Campus Hamburg, Medical Faculty of Semmelweis University, Hamburg, Germany
| | - Jutta Haas
- Institute for Diabetes Research, Department of General Internal Medicine, Asklepios Clinic St. Georg, Asklepios Campus Hamburg, Medical Faculty of Semmelweis University, Hamburg, Germany
| | - Mona Kathrin Herman-Friede
- Institute for Diabetes Research, Department of General Internal Medicine, Asklepios Clinic St. Georg, Asklepios Campus Hamburg, Medical Faculty of Semmelweis University, Hamburg, Germany
| | - Simone Lange
- Institute for Diabetes Research, Department of General Internal Medicine, Asklepios Clinic St. Georg, Asklepios Campus Hamburg, Medical Faculty of Semmelweis University, Hamburg, Germany
| | | | - Jorg Kotzka
- Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center at the Heinrich-Heine-University Duesseldorf, Leibniz Center for Diabetes Research, Duesseldorf, Germany
| | - Dirk Muller-Wieland
- Institute for Diabetes Research, Department of General Internal Medicine, Asklepios Clinic St. Georg, Asklepios Campus Hamburg, Medical Faculty of Semmelweis University, Hamburg, Germany.
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19
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Rondini EA, Pant A, Kocarek TA. Transcriptional Regulation of Cytosolic Sulfotransferase 1C2 by Intermediates of the Cholesterol Biosynthetic Pathway in Primary Cultured Rat Hepatocytes. J Pharmacol Exp Ther 2015; 355:429-41. [PMID: 26427720 DOI: 10.1124/jpet.115.226365] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 09/30/2015] [Indexed: 01/19/2023] Open
Abstract
Cytosolic sulfotransferase 1C2 (SULT1C2) is expressed in the kidney, stomach, and liver of rats; however, the mechanisms regulating expression of this enzyme are not known. We evaluated transcriptional regulation of SULT1C2 by mevalonate (MVA)-derived intermediates in primary cultured rat hepatocytes using several cholesterol synthesis inhibitors. Blocking production of mevalonate with the 3-hydroxy-3-methylglutaryl-CoA reductase inhibitor pravastatin (30 μM), reduced SULT1C2 mRNA content by ∼40% whereas the squalene synthase inhibitor squalestatin (SQ1, 0.1 μM), which causes accumulation of nonsterol isoprenoids, increased mRNA content by 4-fold. Treatment with MVA (10 mM) strongly induced SULT1C2 mRNA by 12-fold, and this effect was blocked by inhibiting squalene epoxidase but not by more distal cholesterol inhibitors, indicating the effects of MVA are mediated by postsqualene metabolites. Using rapid amplification of cDNA ends (RACE), we characterized the 5' end of SULT1C2 mRNA and used this information to generate constructs for promoter analysis. SQ1 and MVA increased reporter activity by ∼1.6- and 3-fold, respectively, from a construct beginning 49 base pairs (bp) upstream from the longest 5'-RACE product (-3140:-49). Sequence deletions from this construct revealed a hepatocyte nuclear factor 1 (HNF1) element (-2558), and mutation of this element reduced basal (75%) and MVA-induced (30%) reporter activity and attenuated promoter activation following overexpression of HNF1α or 1β. However, the effects of SQ1 were localized to a more proximal promoter region (-281:-49). Collectively, our findings demonstrate that cholesterol biosynthetic intermediates influence SULT1C2 expression in rat primary hepatocytes. Further, HNF1 appears to play an important role in mediating basal and MVA-induced SULT1C2 transcription.
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Affiliation(s)
- Elizabeth A Rondini
- Institute of Environmental Health Sciences, Wayne State University, Detroit, Michigan
| | - Asmita Pant
- Institute of Environmental Health Sciences, Wayne State University, Detroit, Michigan
| | - Thomas A Kocarek
- Institute of Environmental Health Sciences, Wayne State University, Detroit, Michigan
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20
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Suzuki E, Kajita S, Takahashi H, Matsumoto T, Tsuruta T, Saegusa M. Transcriptional upregulation of HNF-1β by NF-κB in ovarian clear cell carcinoma modulates susceptibility to apoptosis through alteration in bcl-2 expression. J Transl Med 2015; 95:962-72. [PMID: 26030369 DOI: 10.1038/labinvest.2015.73] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 04/08/2015] [Accepted: 04/21/2015] [Indexed: 11/09/2022] Open
Abstract
Hepatocyte nuclear factor-1β (HNF-1β) is a transcriptional factor that has an important role in endometriosis-ovarian clear cell carcinoma (OCCC) sequence by modulating cell kinetics and glucose metabolism. However, little is known about the detailed molecular mechanisms that govern its regulation and function. Herein, we focus on upstream and downstream regulatory factors of HNF-1β in OCCCs. In clinical samples, HNF-1β expression was positively correlated with the active form of NF-κB/p65 in OCCCs, and closely linked with a low nuclear grade and non-solid architecture. In cell lines, transfection of p65 resulted in increased HNF-1β mRNA and protein expression in TOV-21G cells (OCCC cell line with endogenous HNF-1β expression), in line with activation of the promoter, probably through interacting with the basic transcriptional machinery. Suppression of endogenous HNF-1β expression by siRNA increased apoptosis in TOV-21G cells, while treatment of Hec251 cells (endometrial carcinoma cell line with extremely low endogenous HNF-1β expression) stably overexpressing exogenous HNF-1β with doxorubicin abrogated apoptosis of the cells, along with increased ratio of bcl-2 relative to bax. Moreover, overexpression of HNF-1β led to upregulation of bcl-2 expression at the transcriptional level in TOV-21G cells, which provided evidence for a positive correlation between HNF-1β and bcl-2 expression in OCCCs. These data, therefore, suggest that association between HNF-1β and NF-κB signaling may participate in cell survival by alteration of apoptotic events, particularly in mitochondria-mediated pathways, through upregulation of bcl-2 expression in OCCCs.
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Affiliation(s)
- Erina Suzuki
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara, Japan
| | - Sabine Kajita
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara, Japan
| | - Hiroyuki Takahashi
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara, Japan
| | - Toshihide Matsumoto
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara, Japan
| | - Tomoko Tsuruta
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara, Japan
| | - Makoto Saegusa
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara, Japan
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Kanthimathi S, Balamurugan K, Mohan V, Shanthirani CS, Gayathri V, Radha V. Identification and molecular characterization of HNF1B gene mutations in Indian diabetic patients with renal abnormalities. Ann Hum Genet 2014; 79:10-9. [PMID: 25441779 DOI: 10.1111/ahg.12093] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 10/05/2014] [Indexed: 01/10/2023]
Abstract
Heterozygous mutations of the HNF1B gene (HNF1B-MODY or MODY5) are associated with a wide clinical spectrum of renal and extrarenal disease without clear genotype-phenotype correlation. In this study, we investigated the prevalence of HNF1B gene mutations in young Indian diabetic patients with various renal abnormalities. Fifty unrelated young diabetic patients, who also had renal abnormalities, were selected from the electronic records of a large diabetes centre in Chennai, in southern India. All patients were sequenced for HNF1B gene mutations. The whole or partial gene deletion was analyzed by MLPA. Functional characterization of the novel variant (Asn321Asp) was also performed using transcriptional activation and subcellular localization assays. We identified six different HNF1B gene mutations which included four previously reported (-67C>T, Arg165His, IVS2nt+2insT, Met1_Trp557del) and two novel variations (Asn321Asp, IVS3nt-4C>G). The functional study revealed that the novel variation Asn321Asp in both the heterozygous and homozygous state showed similar transcriptional activity, expression levels and normal transportation of protein to the nucleus similar to wild type, suggesting that it is not likely to be pathogenic. This is the first major study of HNF1B-MODY from India and shows that about 10% of young diabetic subjects with renal abnormalities seen at a tertiary diabetes centre harbor HNF1B gene mutations.
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Affiliation(s)
- Sekar Kanthimathi
- Department of Molecular Genetics, Madras Diabetes Research Foundation, Chennai, India
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22
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Chen CP, Chang SD, Wang TH, Wang LK, Tsai JD, Liu YP, Chern SR, Wu PS, Su JW, Chen YT, Wang W. Detection of recurrent transmission of 17q12 microdeletion by array comparative genomic hybridization in a fetus with prenatally diagnosed hydronephrosis, hydroureter, and multicystic kidney, and variable clinical spectrum in the family. Taiwan J Obstet Gynecol 2014; 52:551-7. [PMID: 24411042 DOI: 10.1016/j.tjog.2013.10.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Accepted: 08/14/2013] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVE This study was aimed at detection of recurrent transmission of the 17q12 microdeletion in a fetus with congenital anomalies of the kidney and urinary tract. MATERIALS AND METHODS A 35-year-old woman was referred to the hospital at 20 weeks' gestation because of hydronephrosis in the fetus. The mother was normal and healthy. Her second child was a girl who had bilateral dysplastic kidneys that required hemodialysis, and died at the age of 5 years. During this pregnancy, the woman underwent amniocentesis at 18 weeks' gestation because of advanced maternal age. Cytogenetic analysis revealed a karyotype of 46,XY. Prenatal ultrasound showed left hydronephrosis with a tortuous ureter, right hydronephrosis, and increased echogenicity of the kidneys. Fetal magnetic resonance imaging showed right dilated renal calyces, left hydronephrosis, hydroureter, and multicystic kidney. The pregnancy was subsequently terminated. Array comparative genomic hybridization (aCGH) and fluorescence in situ hybridization were applied for genetic analysis using umbilical cord, maternal blood, and cultured amniocytes. RESULTS aCGH analysis on umbilical cord detected a 1.75-Mb deletion at 17q12 including haploinsufficiency of LHX1 and HNF1B. aCGH analysis on maternal blood detected a 1.54-Mb deletion at 17q12 including haploinsufficiency of LHX1 and HNF1B. Metaphase fluorescence in situ hybridization analysis on cultured amniocytes and maternal blood lymphocytes using 17q12-specific bacterial artificial chromosome probe showed 17q12 microdeletion in the fetus and the mother. CONCLUSION Prenatal diagnosis of recurrent renal and urinary tract abnormalities in the fetus should include a differential diagnosis of familial 17q12 microdeletion.
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Affiliation(s)
- Chih-Ping Chen
- Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan; Department of Medical Research, Mackay Memorial Hospital, Taipei, Taiwan; Department of Biotechnology, Asia University, Taichung, Taiwan; School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan; Institute of Clinical and Community Health Nursing, National Yang-Ming University, Taipei, Taiwan; Department of Obstetrics and Gynecology, School of Medicine, National Yang-Ming University, Taipei, Taiwan.
| | - Shuenn-Dyh Chang
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Lin-Kou Medical Center, Tao-Yuan, Taiwan; Department of Obstetrics and Gynecology, College of Medicine, Chang Gung University, Tao-Yuan, Taiwan
| | - Tzu-Hao Wang
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Lin-Kou Medical Center, Tao-Yuan, Taiwan; Department of Obstetrics and Gynecology, College of Medicine, Chang Gung University, Tao-Yuan, Taiwan; Genomic Medicine Research Core Laboratory (GMRCL), Chang Gung Memorial Hospital, Lin-Kou Medical Center, Tao-Yuan, Taiwan
| | - Liang-Kai Wang
- Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan
| | - Jeng-Daw Tsai
- Department of Pediatrics, Mackay Memorial Hospital, Taipei, Taiwan
| | - Yu-Peng Liu
- Mackay Junior College of Medicine, Nursing and Management, Taipei, Taiwan; Department of Radiology, Mackay Memorial Hospital Hsinchu Branch, Hsinchu, Taiwan
| | - Schu-Rern Chern
- Department of Medical Research, Mackay Memorial Hospital, Taipei, Taiwan
| | | | - Jun-Wei Su
- Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan; Department of Obstetrics and Gynecology, China Medical University Hospital, Taichung, Taiwan
| | - Yu-Ting Chen
- Department of Medical Research, Mackay Memorial Hospital, Taipei, Taiwan
| | - Wayseen Wang
- Department of Medical Research, Mackay Memorial Hospital, Taipei, Taiwan; Department of Bioengineering, Tatung University, Taipei, Taiwan
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Nikolić ZZ, Branković AS, Savić-Pavićević DLJ, Preković SM, Vukotić VD, Cerović SJ, Filipović NN, Tomović SM, Romac SP, Brajušković GN. Assessment of association between common variants at 17q12 and prostate cancer risk-evidence from Serbian population and meta--analysis. Clin Transl Sci 2014; 7:307-13. [PMID: 24422606 DOI: 10.1111/cts.12130] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
This study aimed to evaluate possible association between genotypes and alleles of two 17q12 polymorphisms (rs3760511 and rs7501939) and prostate cancer (PCa) risk and progression. Two hundred seventy-one patients with PCa, 261 patients with benign prostatic hyperplasia (BPH), and 171 controls were included in the study. Single nucleotide polymorphisms (SNPs) were genotyped by using PCR followed by restriction fragment length (PCR-RFLP) analysis. We conducted meta-analysis of published studies regarding association of these SNPs with PCa risk. Evidence of positive association between the AC genotype of the SNP rs3760511 and BPH risk for the best-fitting overdominant model of association (BPH vs. controls comparison, p = 0.026; odds ratio [OR] = 1.58; 95% confidence interval [95%CI] 1.05-2.36) were obtained. The association between T allele of rs7501939 and PCa risk was determined in PCa versus controls comparison (p = 0.0032; OR = 0.66, 95%CI 0.50-0.87) with the best-fitting model of inheritance being log-additive. This variant was also found to be associated with the risk of BPH (p = 0.0023; OR = 0.65, 95%CI 0.49-0.86). We found no association between parameters of PCa progression and the analyzed SNPs. Meta-analysis showed strong association between these variants and PCa risk. Our study shows association between SNPs at locus 17q12 and the risk of prostatic diseases in Serbian population. At the same time, results of meta-analysis suggest the association of these SNPs with PCa risk.
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Okamoto T, Mandai M, Matsumura N, Yamaguchi K, Kondoh H, Amano Y, Baba T, Hamanishi J, Abiko K, Kosaka K, Murphy SK, Mori S, Konishi I. Hepatocyte nuclear factor-1β (HNF-1β) promotes glucose uptake and glycolytic activity in ovarian clear cell carcinoma. Mol Carcinog 2013; 54:35-49. [PMID: 24105991 DOI: 10.1002/mc.22072] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Revised: 06/25/2013] [Accepted: 07/01/2013] [Indexed: 11/10/2022]
Abstract
Ovarian clear cell carcinoma (OCCC) is a morphologically and biologically distinct subtype of ovarian carcinomas that often arises in ovarian endometriosis. We previously reported that a unique carcinogenic environment, especially iron-induced oxidative stress in endometriotic cysts may promote development of OCCC. We also identified a gene expression profile characteristic of OCCC (the "OCCC signature"). This 320-gene OCCC signature is enriched in genes associated with stress response and sugar metabolism. However, the biological implication of this profile is unclear. In this study, we have focused on the biological role of the HNF-1β gene within the OCCC signature, which was previously shown to be overexpressed in OCCC. Suppression of HNF-1β in the HNF-1β-overexpressing human ovarian cancer cell line RMG2 using short hairpin RNA resulted in a significant increase in proliferation. It also facilitated glucose uptake, glycolytic activity, and lactate secretion along with increased expression of the glucose transporter-1 (GLUT-1) gene and several key enzymes in the glycolytic process. Conversely, forced expression of HNF-1β in the serous ovarian cancer cell line, Hey, resulted in slowed cellular growth and repressed glycolytic activity. These data suggest that HNF-1β represses cell growth, and at the same time, it promotes aerobic glycolysis which is known as the "Warburg effect." As the Warburg effect is regarded as a characteristic metabolic process in cancer which may contribute to cell survival under hypoxic conditions or in a stressful environment, overexpression of HNF-1β may play an inevitable role in the occurrence of OCCC in stressful environment.
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Affiliation(s)
- Takako Okamoto
- Department of Gynecology and Obstetrics, Kyoto University Graduate School of Medicine, Kyoto, Japan; Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, Duke University Medical Center, Durham, North Carolina
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Wan Q, Whang I, Lee J. Molecular and functional characterization of HdHSP20: a biomarker of environmental stresses in disk abalone Haliotis discus discus. FISH & SHELLFISH IMMUNOLOGY 2012; 33:48-59. [PMID: 22498576 DOI: 10.1016/j.fsi.2012.03.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 03/26/2012] [Accepted: 03/28/2012] [Indexed: 05/31/2023]
Abstract
Heat shock proteins (HSPs) production in cell is inducible by many physical and chemical stressors, providing adaptive significance for organisms when faced with environmental changes. In this study, we characterized a novel small HSP gene from disk abalone, designated as HdHSP20, and investigated its temporal expression by different environmental stimuli. The full-length genome sequence of HdHSP20 is composed of three exons and two introns. The 5' flanking region contains multiple putative transcription factor binding sites related to stress response. The open reading frame of the HdHSP20 cDNA is 480 bp and encodes 160 amino acid residues with 18.76 kDa molecular mass. The deduced amino acid sequence shares highest similarity with HSP20 genes from other invertebrates. HdHSP20 also shows several structural signatures of small HSP, including the conserved α-crystallin domain, the absence of cysteine residues, a high number of Glx/Asx residues and the compact β-sandwich structure in the C-terminal region. Overexpression of recombinant HdHSP20 protein conveyed enhanced thermotolerance to Escherichia coli cells, suggesting its functional activity in the cellular chaperone network. qRT-PCR measurements of HdHSP20 mRNA level have shown rapid and drastic induction by extreme temperatures, extreme salinities, heavy metals and the microbial infections. Collectively, our results suggest that HdHSP20 gene is likely involved in the stress resistant mechanisms in disk abalone. Its expression may serve as a potential biomarker capable to indicate a stress state in abalone due to extreme environmental change and pathogen infection.
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Affiliation(s)
- Qiang Wan
- Department of Marine Life Sciences, Jeju National University, Jeju 690-756, Republic of Korea
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HNF1B polymorphism associated with development of prostate cancer in Korean patients. Urology 2011; 78:969.e1-6. [PMID: 21982019 DOI: 10.1016/j.urology.2011.06.045] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Revised: 06/24/2011] [Accepted: 06/24/2011] [Indexed: 11/23/2022]
Abstract
OBJECTIVE To identify whether the genetic variations in HNF1B are associated with the development of prostate cancer in Korean patients. Genome-wide association studies have found the HNF1B gene at 17q12 to be a major causal gene for the risk of prostate cancer. METHODS We evaluated the association of 47 single nucleotide polymorphisms (SNPs) in the HNF1B gene with prostate cancer risk and clinical characteristics (Gleason score and tumor stage) in Korean men (240 case subjects and 223 control subjects) using unconditional logistic regression analysis. RESULTS Of the 47 SNPs, 14 were associated with prostate cancer risk (P = .002-.02); 9 SNPs were associated with a lower risk of prostate cancer (odds ratio 0.67-0.71, P = .005-.05), and 5 SNPs were associated with a greater risk of disease (odds ratio 1.49-1.51, P = .002-.02). In an analysis involving only patients with prostate cancer, 1 SNP (rs11868513) in the HNF1B gene was more frequent in patients with tumors with a greater stage than in those with a lower tumor stage. Two SNPs (rs4430796 and rs2074429) and 1 haplotype (Block3_ht1) were more frequent in patients with Gleason score of ≥7 than in those with Gleason score <6. CONCLUSION As in studies from other populations, our findings indicate that HNF1B is also associated with prostate cancer risk in the Korean population.
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Pelletier L, Rebouissou S, Vignjevic D, Bioulac-Sage P, Zucman-Rossi J. HNF1α inhibition triggers epithelial-mesenchymal transition in human liver cancer cell lines. BMC Cancer 2011; 11:427. [PMID: 21975049 PMCID: PMC3203860 DOI: 10.1186/1471-2407-11-427] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Accepted: 10/05/2011] [Indexed: 12/31/2022] Open
Abstract
Background Hepatocyte Nuclear Factor 1α (HNF1α) is an atypical homeodomain-containing transcription factor that transactivates liver-specific genes including albumin, α-1-antitrypsin and α- and β-fibrinogen. Biallelic inactivating mutations of HNF1A have been frequently identified in hepatocellular adenomas (HCA), rare benign liver tumors usually developed in women under oral contraceptives, and in rare cases of hepatocellular carcinomas developed in non-cirrhotic liver. HNF1α-mutated HCA (H-HCA) are characterized by a marked steatosis and show activation of glycolysis, lipogenesis, translational machinery and mTOR pathway. We studied the consequences of HNF1α silencing in hepatic cell lines, HepG2 and Hep3B and we reproduced most of the deregulations identified in H-HCA. Methods We transfected hepatoma cell lines HepG2 and Hep3B with siRNA targeting HNF1α and obtained a strong inhibition of HNF1α expression. We then looked at the phenotypic changes by microscopy and studied changes in gene expression using qRT-PCR and Western Blot. Results Hepatocytes transfected with HNF1α siRNA underwent severe phenotypic changes with loss of cell-cell contacts and development of migration structures. In HNF1α-inhibited cells, hepatocyte and epithelial markers were diminished and mesenchymal markers were over-expressed. This epithelial-mesenchymal transition (EMT) was related to the up regulation of several EMT transcription factors, in particular SNAIL and SLUG. We also found an overexpression of TGFβ1, an EMT initiator, in both cells transfected with HNF1α siRNA and H-HCA. Moreover, TGFβ1 expression is strongly correlated to HNF1α expression in cell models, suggesting regulation of TGFβ1 expression by HNF1α. Conclusion Our results suggest that HNF1α is not only important for hepatocyte differentiation, but has also a role in the maintenance of epithelial phenotype in hepatocytes.
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Affiliation(s)
- Laura Pelletier
- Inserm U674 Génomique fonctionnelle des tumeurs solides, Paris, France
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Faguer S, Decramer S, Chassaing N, Bellanné-Chantelot C, Calvas P, Beaufils S, Bessenay L, Lengelé JP, Dahan K, Ronco P, Devuyst O, Chauveau D. Diagnosis, management, and prognosis of HNF1B nephropathy in adulthood. Kidney Int 2011; 80:768-76. [PMID: 21775974 DOI: 10.1038/ki.2011.225] [Citation(s) in RCA: 123] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Mutations in HNF1B are responsible for a dominantly inherited disease with renal and nonrenal consequences, including maturity-onset diabetes of the young (MODY) type 5. While HNF1B nephropathy is typically responsible for bilateral renal cystic hypodysplasia in childhood, the adult phenotype is poorly described. To help define this we evaluated the clinical presentation, imaging findings, genetic changes, and disease progression in 27 adults from 20 families with HNF1B nephropathy. Whole-gene deletion was found in 11 families, point mutations in 9, and de novo mutations in half of the kindred tested. Renal involvement was extremely heterogeneous, with a tubulointerstitial profile at presentation and slowly progressive renal decline throughout adulthood as hallmarks of the disease. In 24 patients tested, there were cysts (≤5 per kidney) in 15, a solitary kidney in 5, hypokalemia in 11, and hypomagnesemia in 10 of 16 tested, all as characteristics pointing to HNF1B disease. Two patients presented with renal Fanconi syndrome and, overall, 4 progressed to end-stage renal failure. Extrarenal phenotypes consisted of diabetes mellitus in 13 of the 27 patients, including 11 with MODY, abnormal liver tests in 8 of 21, diverse genital tract abnormalities in 5 of 13 females, and infertility in 2 of 14 males. Thus, our findings provide data that are useful for recognition and diagnosis of HNF1B disease in adulthood and might help in renal management and genetic counseling.
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Affiliation(s)
- Stanislas Faguer
- Service de Néphrologie et Immunologie clinique, Hôpital Rangueil, CHU Toulouse, France.
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Lennerz JK, Spence DC, Iskandar SS, Dehner LP, Liapis H. Glomerulocystic kidney: one hundred-year perspective. Arch Pathol Lab Med 2010; 134:583-605. [PMID: 20367310 DOI: 10.5858/134.4.583] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
CONTEXT Glomerular cysts, defined as Bowman space dilatation greater than 2 to 3 times normal size, are found in disorders of diverse etiology and with a spectrum of clinical manifestations. The term glomerulocystic kidney (GCK) refers to a kidney with greater than 5% cystic glomeruli. Although usually a disease of the young, GCK also occurs in adults. OBJECTIVE To assess the recent molecular genetics of GCK, review our files, revisit the literature, and perform in silico experiments. DATA SOURCES We retrieved 20 cases from our files and identified more than 230 cases published in the literature under several designations. CONCLUSIONS Although GCK is at least in part a variant of autosomal dominant or recessive polycystic kidney disease (PKD), linkage analysis has excluded PKD-associated gene mutations in many cases of GCK. A subtype of familial GCK, presenting with cystic kidneys, hyperuricemia, and isosthenuria is due to uromodullin mutations. In addition, the familial hypoplastic variant of GCK that is associated with diabetes is caused by mutations in TCF2, the gene encoding hepatocyte nuclear factor-1beta. The term GCK disease (GCKD) should be reserved for the latter molecularly recognized/inherited subtypes of GCK (not to include PKD). Review of our cases, the literature, and our in silico analysis of the overlapping genetic entities integrates established molecular-genetic functions into a proposed model of glomerulocystogenesis; a classification scheme emerged that (1) emphasizes the clinical significance of glomerular cysts, (2) provides a pertinent differential diagnosis, and (3) suggests screening for probable mutations.
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Affiliation(s)
- Jochen K Lennerz
- Department of Pathology and Immunology, Washington University, St Louis, Missouri 63110, USA
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Michels AJ, Hagen TM. Hepatocyte nuclear factor 1 is essential for transcription of sodium-dependent vitamin C transporter protein 1. Am J Physiol Cell Physiol 2009; 297:C1220-7. [PMID: 19741195 DOI: 10.1152/ajpcell.00348.2009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Transport and distribution of vitamin C is primarily regulated by the function of sodium-dependent vitamin C transporters (SVCTs). SVCT1 is expressed in the small intestine, liver, and kidney, organs that play a vital role in whole body vitamin C homeostasis. Despite the importance of this protein, little is known about regulation of the gene encoding SVCT1, Slc23a1. In this study, we present the first investigation of the transcriptional regulation of human Slc23a1, identifying transcription factors that may influence its expression. A 1,239-bp genomic DNA fragment corresponding to the 5'-flanking region of Slc23a1 was isolated from a human hepatocarcinoma cell line (HepG2) and sequenced. When cloned into a reporter gene construct, robust transcriptional activity was seen in this sequence, nearly 25-fold above the control vector. Deletion analysis of the SVCT1 reporter gene vector defined the minimal active promoter as a small 135-bp region upstream of the transcriptional start site. While several transcription factor binding sites were identified within this sequence, reporter constructs showed that basal transcription required the binding of hepatic nuclear factor 1 (HNF-1) to its cognate sequence. Furthermore, mutation of this HNF-1 binding site resulted in complete loss of luciferase expression, even in the context of the whole promoter. Additionally, small interfering RNA knockdown of both members of the HNF-1 family, HNF-1alpha and HNF-1beta, resulted in a significant decline in SVCT1 transcription. Together, these data suggest that HNF-1alpha and/or HNF-1beta binding is required for SVCT1 expression and may be involved in the coordinate regulation of whole body vitamin C status.
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Affiliation(s)
- Alexander J Michels
- Linus Pauling Institute and the Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon 97331, USA
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Liu P, Khurana A, Rattan R, He X, Kalloger S, Dowdy S, Gilks B, Shridhar V. Regulation of HSulf-1 expression by variant hepatic nuclear factor 1 in ovarian cancer. Cancer Res 2009; 69:4843-50. [PMID: 19487294 DOI: 10.1158/0008-5472.can-08-3065] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We recently identified HSulf-1 as a down-regulated gene in ovarian carcinomas. Our previous analysis indicated that HSulf-1 inactivation in ovarian cancers is partly mediated by loss of heterozygosity and epigenetic silencing. Here, we show that variant hepatic nuclear factor 1 (vHNF1), encoded by transcription factor 2 gene (TCF2, HNF1beta), negatively regulates HSulf-1 expression in ovarian cancer. Immunoblot assay revealed that vHNF1 is highly expressed in HSulf-1-deficient OV207, SKOV3, and TOV-21G cell lines but not in HSulf-1-expressing OSE, OV167, and OV202 cells. By short hairpin RNA-mediated down-regulation of vHNF1 in TOV-21G cells and transient enhanced vHNF1 expression in OV202 cells, we showed that vHNF1 suppresses HSulf-1 expression in ovarian cancer cell lines. Reporter assay and chromatin immunoprecipitation experiments showed that vHNF1 is specifically recruited to HSulf-1 promoter at two different vHNF1-responsive elements in OV207 and TOV-21G cells. Additionally, down-regulation of vHNF1 expression in OV207 and TOV-21G cells increased cisplatin- or paclitaxel-mediated cytotoxicity as determined by both 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide and clonogenic assays and this effect was reversed by down-regulation of HSulf-1. Moreover, nude mice bearing TOV-21G cell xenografts with stably down-regulated vHNF1 were more sensitive to cisplatin- or paclitaxel-induced cytotoxicity compared with xenografts of TOV-21G clonal lines with nontargeted control short hairpin RNA. Finally, immunohistochemical analysis of 501 ovarian tumors including 140 clear-cell tumors on tissue microarrays showed that vHNF1 inversely correlates to HSulf-1 expression. Collectively, these results indicate that vHNF1 acts as a repressor of HSulf-1 expression and might be a molecular target for ovarian cancer therapy.
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Affiliation(s)
- Peng Liu
- Departments of Experimental Pathology, University of British Columbia, Vancouver, British Columbia, Canada
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Yee SW, Shima JE, Hesselson S, Nguyen L, De Val S, Lafond RJ, Kawamoto M, Johns SJ, Stryke D, Kwok PY, Ferrin TE, Black BL, Gurwitz D, Ahituv N, Giacomini KM. Identification and characterization of proximal promoter polymorphisms in the human concentrative nucleoside transporter 2 (SLC28A2). J Pharmacol Exp Ther 2008; 328:699-707. [PMID: 19098160 DOI: 10.1124/jpet.108.147207] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The human concentrative nucleoside transporter 2 (CNT2) plays an important role in the absorption, disposition, and biological effects of endogenous nucleosides and nucleoside analog drugs. We identified genetic variation in the basal promoter region of CNT2 and characterized the function of the variants. We screened DNA from an ethnically diverse population and identified five basal promoter variants in CNT2. Three major haplotypes in the CNT2 basal promoter region were identified and were found at different allele frequencies in various ethnic groups. The common promoter variants and haplotypes were constructed and characterized for their promoter activity using luciferase reporter assays. One polymorphic variant, rs2413775 (-146T>A), with an allele frequency >20% in all populations, showed a gain of function in luciferase activity. Furthermore, in vivo mouse promoter assays of these nucleotide variants using the hydrodynamic tail vein injection, leading to their expression in the liver, demonstrated similar results. Transcription factor binding site (TFBS) analysis indicated this variant alters a hepatic nuclear factor (HNF) 1 TFBS. Electrophoretic mobility shift assay demonstrated stronger binding of HNF1alpha and weaker binding of HNF1beta to the -146T and -146A regions, whereas the single nucleotide polymorphism (SNP), -146A, exhibited enhanced binding to both HNF1alpha and HNF1beta, consistent with its greater activity in reporter assays. The data collectively suggest that the common variant, -146T>A, in the proximal promoter of CNT2 may result in an enhanced transcription rate of the gene and, thus, expression levels of CNT2. This SNP may play a role in variation in the pharmacokinetics and pharmacological effects of nucleoside analogs.
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Affiliation(s)
- Sook Wah Yee
- Department of Biopharmaceutical Sciences, University of California, 1550 4th Street, RH584, Box 2911, San Francisco, CA 94158-2911, USA
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Clear cell carcinoma of the pancreas: histopathologic features and a unique biomarker: hepatocyte nuclear factor-1beta. Mod Pathol 2008; 21:1075-83. [PMID: 18536653 DOI: 10.1038/modpathol.2008.95] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Clear cell carcinoma as a variant of ductal carcinoma of the pancreas is not well recognized. Hepatocyte nuclear factor-1beta as a transcription factor has been identified as a specific biomarker of clear cell tumor of the female genital tract. The aim of this study was to systematically analyze clear cell carcinoma of the pancreas and its unique biomarker hepatocyte nuclear factor-1beta. A total of 84 pancreatic adenocarcinomas were analyzed pathologically and with an immunohistochemical approach with hepatocyte nuclear factor-1beta antibody. The identified clear cell carcinomas were further studied by PAS, DPAS, and mucicarmine stains. Pathologic features and clinical follow-up were documented. Of them, 20 (24%) pancreatic adenocarcinomas were identified with clear cell features, including 12 clear cell carcinomas and 8 ductal adenocarcinomas with clear cell component (defined as less than 75% of tumor with clear cells). Cytologically, the clear cell carcinomas exhibited clear cytoplasm with centrally located, atypical nuclei. PAS, DPAS, and mucicarmine stains confirmed that the clear cytoplasm was not due to accumulation of glycogen or mucin. The results of immunostaining showed that hepatocyte nuclear factor-1beta is overexpressed in all clear cell carcinomas and in the clear cell components of eight ductal carcinomas with clear cell features. In contrast, in usual ductal adenocarcinoma, hepatocyte nuclear factor-1beta exhibited overall weak or focally moderate staining; only eight cases were strongly positive (15%) of which 38% were high grade and 63% were moderate grade. However, when included with the strong staining cases in mixed and clear cell carcinoma, this group regardless of morphology appeared to correlate with worse survival compared to the group with weak hepatocyte nuclear factor-1beta staining across morphologies (P<0.01). Thus, clear cell carcinoma of the pancreas is not an uncommon variant of pancreatic ductal adenocarcinoma. Hepatocyte nuclear factor-1beta is a useful marker to identify these clear cell carcinomas, and its overexpression may aid in stratifying survival rate.
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Abstract
The importance of hepatocyte nuclear factors (HNFs), as well as other transcription factors in β-cell development and function, was underlined by the characterization of human mutations causing maturity-onset diabetes of the young (MODY). HNF1A and HNF1B mutations lead to MODY forms 3 and 5, respectively. Thus, transcriptional control is an essential mechanism underlying the precise metabolic control exerted by β-cells in regulating insulin release. The diabetes phenotype of MODY3 (HNF1α) and the phenotypes of MODY5 (HNF1β), which can also include renal disease and genitourinary malformations, as well as neonatal diabetes and pancreatic agenesis, have now been described. However, detailed molecular pathology remains elusive. The large array of dominant-negative and deletion mutations, and the lack of structure-phenotype relationships for most mutations, have not helped us to formulate a mechanistic understanding. Further molecular studies of HNF1 actions and gene regulation are anticipated to provide useful insights into β-cell biology and potential therapeutic tools.
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Affiliation(s)
- David B Rhoads
- a Director, Pediatric Endocrine Research Laboratory, MassGeneral Hospital for Children, 55 Fruit Street - BHX410, Boston, MA 02114-2696, USA.
| | - Lynne L Levitsky
- b Chief, Pediatric Endocrine Unit, MassGeneral Hospital for Children, 175 Cambridge Street - CPZS-5, Boston, MA 02114-2696, USA.
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Dmitrieva RI, Hinojos CA, Boerwinkle E, Braun MC, Fornage M, Doris PA. Hepatocyte nuclear factor 1 and hypertensive nephropathy. Hypertension 2008; 51:1583-9. [PMID: 18443232 DOI: 10.1161/hypertensionaha.108.110163] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Hypertension in spontaneously hypertensive rat (SHR) is associated with renal redox stress, and we hypothesized that nephropathy arises in SHR-A3 from altered capacity to mitigate redox stress compared with nephropathy-resistant SHR lines. We measured renal expression of redox genes in distinct lines of the spontaneously hypertensive rat (SHR-A3, SHR-B2, SHR-C) and the normotensive Wistar-Kyoto (WKY) strain. The SHR lines differ in either resisting (SHR-B2, SHR-C) or experiencing hypertensive nephropathy (SHR-A3). Immediately before the emergence of hypertensive renal injury expression of redox genes in SHR-A3 was profoundly altered compared with the injury-resistant SHR lines and WKY. This change appeared to arise in antioxidant genes where 16 of 28 were expressed at 34.3% of the level in the reference strain (WKY). No such change was observed in the injury-resistant SHR lines. We analyzed occurrence of transcription factor matrices in the promoters of the downregulated antioxidant genes. In these genes, the hepatocyte nuclear factor 1 (HNF1) transcription factor matrix was found to be nearly twice as likely to be present and the overall frequency of HNF1 sites was nearly 5 times higher, compared with HNF1 transcription factor matrices in antioxidant genes that were not downregulated. We identified 35 other (nonredox) renal genes regulated by HNF1. These were also significantly downregulated in SHR-A3, but not in SHR-B2 or SHR-C. Finally, expression of genes that comprise HNF1 (Tcf1, Tcf2, and Dcoh) was also downregulated in SHR-A3. The present experiments uncover a major change in transcriptional control by HNF1 that affects redox and other genes and precedes emergence of hypertensive renal injury.
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Affiliation(s)
- Renata I Dmitrieva
- Institute of Molecular Medicine, University of Texas HSC at Houston, TX 77030, USA
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Bellanné-Chantelot C, Carette C, Riveline JP, Valéro R, Gautier JF, Larger E, Reznik Y, Ducluzeau PH, Sola A, Hartemann-Heurtier A, Lecomte P, Chaillous L, Laloi-Michelin M, Wilhem JM, Cuny P, Duron F, Guerci B, Jeandidier N, Mosnier-Pudar H, Assayag M, Dubois-Laforgue D, Velho G, Timsit J. The type and the position of HNF1A mutation modulate age at diagnosis of diabetes in patients with maturity-onset diabetes of the young (MODY)-3. Diabetes 2008; 57:503-8. [PMID: 18003757 DOI: 10.2337/db07-0859] [Citation(s) in RCA: 143] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The clinical expression of maturity-onset diabetes of the young (MODY)-3 is highly variable. This may be due to environmental and/or genetic factors, including molecular characteristics of the hepatocyte nuclear factor 1-alpha (HNF1A) gene mutation. RESEARCH DESIGN AND METHODS We analyzed the mutations identified in 356 unrelated MODY3 patients, including 118 novel mutations, and searched for correlations between the genotype and age at diagnosis of diabetes. RESULTS Missense mutations prevailed in the dimerization and DNA-binding domains (74%), while truncating mutations were predominant in the transactivation domain (62%). The majority (83%) of the mutations were located in exons 1- 6, thus affecting the three HNF1A isoforms. Age at diagnosis of diabetes was lower in patients with truncating mutations than in those with missense mutations (18 vs. 22 years, P = 0.005). Missense mutations affecting the dimerization/DNA-binding domains were associated with a lower age at diagnosis than those affecting the transactivation domain (20 vs. 30 years, P = 10(-4)). Patients with missense mutations affecting the three isoforms were younger at diagnosis than those with missense mutations involving one or two isoforms (P = 0.03). CONCLUSIONS These data show that part of the variability of the clinical expression in MODY3 patients may be explained by the type and the location of HNF1A mutations. These findings should be considered in studies for the search of additional modifier genetic factors.
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Affiliation(s)
- Christine Bellanné-Chantelot
- Département de Génétique, Groupe Hospitalier Pitié-Salpétrière, Bât 6 rue Lapeyronie, 47/83 Boulevard de l'Hôpital, 75651 Paris Cedex 13, France.
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Holland PWH, Booth HAF, Bruford EA. Classification and nomenclature of all human homeobox genes. BMC Biol 2007; 5:47. [PMID: 17963489 PMCID: PMC2211742 DOI: 10.1186/1741-7007-5-47] [Citation(s) in RCA: 285] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Accepted: 10/26/2007] [Indexed: 12/19/2022] Open
Abstract
Background The homeobox genes are a large and diverse group of genes, many of which play important roles in the embryonic development of animals. Increasingly, homeobox genes are being compared between genomes in an attempt to understand the evolution of animal development. Despite their importance, the full diversity of human homeobox genes has not previously been described. Results We have identified all homeobox genes and pseudogenes in the euchromatic regions of the human genome, finding many unannotated, incorrectly annotated, unnamed, misnamed or misclassified genes and pseudogenes. We describe 300 human homeobox loci, which we divide into 235 probable functional genes and 65 probable pseudogenes. These totals include 3 genes with partial homeoboxes and 13 pseudogenes that lack homeoboxes but are clearly derived from homeobox genes. These figures exclude the repetitive DUX1 to DUX5 homeobox sequences of which we identified 35 probable pseudogenes, with many more expected in heterochromatic regions. Nomenclature is established for approximately 40 formerly unnamed loci, reflecting their evolutionary relationships to other loci in human and other species, and nomenclature revisions are proposed for around 30 other loci. We use a classification that recognizes 11 homeobox gene 'classes' subdivided into 102 homeobox gene 'families'. Conclusion We have conducted a comprehensive survey of homeobox genes and pseudogenes in the human genome, described many new loci, and revised the classification and nomenclature of homeobox genes. The classification scheme may be widely applicable to homeobox genes in other animal genomes and will facilitate comparative genomics of this important gene superclass.
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Affiliation(s)
- Peter W H Holland
- Department of Zoology, University of Oxford, South Parks Road, Oxford, OX1 3PS, UK.
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Lou G, Li Y, Chen B, Chen M, Chen J, Liao R, Zhang Y, Wang Y, Zhou D. Functional analysis on the 5'-flanking region of human FXR gene in HepG2 cells. Gene 2007; 396:358-68. [PMID: 17507182 DOI: 10.1016/j.gene.2007.04.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2006] [Revised: 03/13/2007] [Accepted: 04/09/2007] [Indexed: 01/10/2023]
Abstract
The farnesoid X receptor (FXR) is a bile acid (BA)-activated nuclear receptor that plays a major role in the regulation of BA and lipid metabolism. Although modulation of FXR expression has been reported, the mechanisms underlying the regulation of human FXR are yet unclear. Functional assays showed that the -150/+29 nucleotides region from the first nucleotide at the Exon I is the minimal promoter of the human FXR gene by the technique of serial deletion and point mutants of the 5'-flanking region. Chromatin immunoprecipitation analysis and electrophoretic mobility shift assay revealed that hepatic nuclear factor 1alpha (HNF1alpha) interacted with the region. Co-transfection of the promoter with HNF1alpha expression vectors enhanced promoter activity of FXR gene. Over-expression of HNF1alpha up-regulated FXR expression in HepG2 cells. These data indicate that (a) the identified HNF1alpha binding site serves as a positive regulatory sequence, (b) the binding site is functionally active both in vivo and in vitro, and (c) the transcription factor HNF1alpha that binds to this site plays an important role in the regulation of human FXR promoter activity.
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Affiliation(s)
- Guiyu Lou
- Department of Biochemistry and Molecular Biology, Third Military Medical University, Chongqing 400038, China
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Rowley CW, Staloch LJ, Divine JK, McCaul SP, Simon TC. Mechanisms of mutual functional interactions between HNF-4alpha and HNF-1alpha revealed by mutations that cause maturity onset diabetes of the young. Am J Physiol Gastrointest Liver Physiol 2006; 290:G466-75. [PMID: 16223942 DOI: 10.1152/ajpgi.00431.2005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Hepatic nuclear factor (HNF)-4alpha and HNF-1alpha are key endodermal transcriptional regulators that physically and functionally interact. HNF-4alpha and HNF-1alpha cooperatively activate genes with binding sites for both factors, whereas suppressive interactions occur at regulatory sequences with a binding site for only one factor. The liver fatty acid binding protein gene (Fabp1) has binding sites for both factors, and chromatin precipitation assays were utilized to demonstrate that HNF-4alpha increased HNF-1alpha Fabp1 promoter occupancy during cooperative transcriptional activation. The HNF4 P2 promoter contains a HNF-1 but not HNF-4 binding site, and HNF-4alpha suppressed HNF-1alpha HNF4 P2 activation and decreased promoter HNF-1alpha occupancy. The apolipoprotein C III (APOC3) promoter contains a HNF-4 but not HNF-1 binding site, and HNF-1alpha suppressed HNF-4alpha APOC3 activation and decreased HNF-4alpha promoter occupancy. Maturity onset diabetes of the young (MODY) as well as defects in hepatic lipid metabolism result from mutations in either HNF-4alpha or HNF-1alpha. We found that MODY missense mutant R127W HNF-4alpha retained wild-type individual Fabp1 activation and bound to HNF-1alpha better than wild-type HNF-4alpha, yet did not cooperate with HNF-1alpha or increase HNF-1alpha Fabp1 promoter occupancy. The R127W mutant was also defective in both suppressing HNF-1alpha activation of HNF4 P2 and decreasing HNF-1alpha promoter occupancy. The HNF-1alpha R131Q MODY mutant also retained wild-type Fabp1 activation and bound to HNF-4alpha as well as the wild type but was defective in both suppressing HNF-4alpha APOC3 activation and decreasing HNF-4alpha promoter occupancy. These results suggest HNF-1alpha-HNF-4alpha functional interactions are accomplished by regulating factor promoter occupancy and that defective factor-factor interactions may contribute to the MODY phenotype.
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Affiliation(s)
- Christopher W Rowley
- Department of Pediatrics, Washington University School of Medicine, Campus Box 8208, St. Louis, MO 63110, USA
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Ostendorff HP, Tursun B, Cornils K, Schlüter A, Drung A, Güngör C, Bach I. Dynamic expression of LIM cofactors in the developing mouse neural tube. Dev Dyn 2006; 235:786-91. [PMID: 16395690 DOI: 10.1002/dvdy.20669] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The developmental regulation of LIM homeodomain transcription factors (LIM-HD) by the LIM domain-binding cofactors CLIM/Ldb/NLI and RLIM has been demonstrated. Whereas CLIM cofactors are thought to be required for at least some of the in vivo functions of LIM-HD proteins, the ubiquitin ligase RLIM functions as a negative regulator by its ability to target CLIM cofactors for proteasomal degradation. In this report, we have investigated and compared the protein expression of both factors in the developing mouse neural tube. We co-localize both proteins in many tissues and, although widely expressed, we detect high levels of both cofactors in specific neural tube regions, e.g., in the ventral neural tube, where motor neurons reside. The mostly ubiquitous distribution of RLIM- and CLIM-encoding mRNA differs from the more specific expression of both cofactors at the protein level, indicating post-transcriptional regulation. Furthermore, we show that both cofactors not only co-localize with each other but also with Isl and Lhx3 LIM-HD proteins in developing ventral neural tube neurons. Our results demonstrate the dynamic expression of cofactors participating in the regulation of LIM-HD proteins during the development of the neural tube in mice and suggest additional post-transcriptional regulation in the nuclear LIM-HD protein network.
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Affiliation(s)
- Heather P Ostendorff
- Zentrum für Molekulare Neurobiologie Hamburg , Universität Hamburg, Martinistr. 85, 20251 Hamburg, Germany
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Xu J, Hershman JM. Histone deacetylase inhibitor depsipeptide represses nicotinamide N-methyltransferase and hepatocyte nuclear factor-1beta gene expression in human papillary thyroid cancer cells. Thyroid 2006; 16:151-60. [PMID: 16676400 DOI: 10.1089/thy.2006.16.151] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Nicotinamide N-methyltransferase (NNMT) catalyzes N-methylation of nicotinamide and other structural analogues. NNMT gene expression is enhanced in many papillary thyroid cancer cells and activated by hepatocyte nuclear factor (HNF)-1beta. In this work, we studied the effects of depsipeptide, a histone deacetylase inhibitor, on NNMT gene expression in BHP 18-21 papillary thyroid cancer cells. Depsipeptide reduced NNMT mRNA level in a dose-dependent and time-dependent manner as determined by semiquantitative reverse transcriptase-polymerase chain reaction (RT-PCR). In contrast, expression of the sodium iodide symporter (NIS), a gene with differentiated function, waas enhanced in the treated cells. NNMT protein level determined by Western blot analysis and NNMT catalytic activity was also reduced significantly in the depsipeptide-treated cells. To study the mechanism of NNMT gene repression by depsipeptide, effects of depsipeptide on NNMT promoter activity were determined by luciferase reporter gene assay. NNMT promoter activity was significantly reduced in the HNF-1beta-positive BHP 18-21 cells but not in the HNF-1beta-negative BHP 14-9 papillary cancer cells. A mutant reporter construct with mutations in a HNF-1 site in the NNMT basal promoter region did not respond to depsipeptide in both HNF-1beta protein levels, and abolished activity of DNA binding to the HNF-1 site in the NNMT promoter region. Protein synthesis inhibitor cycloheximide and proteasome inhibitor MG-132 enhanced HNF-1beta stability in the depsipeptide-treated cells. In summary, depsipeptide represses NNMT and HNF-1beta gene expression in some papillary thyroid cancer cells. the repression of NNMT by depsipeptide is at the transcription level through downregulation of transcription activator HNF-1beta.
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Affiliation(s)
- Jimin Xu
- Endocrinology and Diabetes Division, VA Greater Los Angeles Healthcare System, David Geffen School of Medicine at UCLA, CA, USA
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Staloch LJ, Divine JK, Witten JT, Simon TC. C/EBP and Cdx family factors regulate liver fatty acid binding protein transgene expression in the small intestinal epithelium. ACTA ACUST UNITED AC 2005; 1731:168-78. [PMID: 16321657 DOI: 10.1016/j.bbaexp.2005.08.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2005] [Revised: 08/09/2005] [Accepted: 08/25/2005] [Indexed: 11/23/2022]
Abstract
A transgene constructed from the rat liver fatty acid binding protein gene (Fabp1) promoter is active in all murine small intestinal crypt and villus epithelial cells. Coincident Cdx and C/EBP transcription factor binding sites were identified spanning Fabp1 nucleotides -90 to -78. CDX-1, CDX-2, C/EBPalpha, and C/EBPbeta activated the Fabp1 transgene in CaCo-2 cells, and mutagenizing the -78 site prevented activation by these factors. CDX but not C/EBP factors bound to the site in vitro, although C/EBP factors competed with CDX factors for transgene activation. The -78 site adjoins an HNF-1 site, and CDX and C/EBP family factors cooperated with HNF-1alpha but not HNF-1beta to activate the transgene. Furthermore, CDX-1, CDX-2, C/EBPalpha, and C/EBPbeta bound to HNF-1alpha and HNF-1beta. The transgene with a mutagenized -78 site was silenced in vivo specifically in small intestinal crypt epithelial cells but remained active in villus cells. These results demonstrate functional interactions between HNF-1, C/EBP, and CDX family factors and suggest that these interactions may contribute to differential transcriptional regulation in the small intestinal crypt and villus compartments.
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Affiliation(s)
- Lora J Staloch
- Department of Pediatrics, Washington University School of Medicine, Campus Box 8208, St. Louis, MO 63110, USA
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43
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Abstract
ACAT catalyzes the formation of cholesteryl esters from cholesterol and long-chain fatty acids. There are two known genes encoding the two ACAT enzymes, ACAT1 and ACAT2 (also known as Soat1 and Soat2). In adult humans, ACAT1 is present in most tissues, whereas ACAT2 is localized to enterocytes and hepatocytes. In this report, we elucidate the mechanisms that control the liver-specific expression of the human ACAT2 gene. We identified hepatic nuclear factor 1 (HNF1) as an important liver-specific trans-acting element for the human ACAT2 gene using the human hepatocellular carcinoma cell lines HuH7 and HepG2. Targeted deletion of the HNF1 binding site in the DNA sequence abolished not only the basal promoter function in HepG2 and HuH7 cells but also the induction of the ACAT2 promoter by HNF1. Electrophoretic mobility shift assay and chromatin immunoprecipitation assay demonstrated that the transcription factors HNF1alpha and HNF1beta interact with this region in the human ACAT2 gene in vitro and in vivo. These data indicate that a) the identified HNF1 binding site serves as a positive regulator sequence, b) the binding site is functionally active both in vivo and in vitro, and c) the transcription factors HNF1alpha and HNF1beta, which bind to this site, play an important part in the regulation of the human ACAT2 promoter.
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Affiliation(s)
- Camilla Pramfalk
- Metabolism Unit, Center for Metabolism and Endocrinology, NOVUM, Karolinska Institutet at Karolinska University Hospital in Huddinge, S-141 86 Stockholm, Sweden
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44
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Hiesberger T, Shao X, Gourley E, Reimann A, Pontoglio M, Igarashi P. Role of the Hepatocyte Nuclear Factor-1β (HNF-1β) C-terminal Domain in Pkhd1 (ARPKD) Gene Transcription and Renal Cystogenesis. J Biol Chem 2005; 280:10578-86. [PMID: 15647252 DOI: 10.1074/jbc.m414121200] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Hepatocyte nuclear factor-1beta (HNF-1beta) is a homeodomain-containing transcription factor that regulates tissue-specific gene expression in the kidney and other epithelial organs. Mutations of HNF-1beta produce congenital cystic abnormalities of the kidney, and previous studies showed that HNF-1beta regulates the expression of the autosomal recessive polycystic kidney disease (ARPKD) gene, Pkhd1. Here we show that the C-terminal region of HNF-1beta contains an activation domain that is functional when fused to a heterologous DNA-binding domain. An HNF-1beta deletion mutant lacking the C-terminal domain interacts with wild-type HNF-1beta, binds DNA, and functions as a dominant-negative inhibitor of a chromosomally integrated Pkhd1 promoter. The activation of the Pkhd1 promoter by wild-type HNF-1beta is stimulated by sodium butyrate or coactivators CREB (cAMP-response element)-binding protein (CBP) and P/CAF. The interaction with CBP and P/CAF requires the C-terminal domain. Expression of an HNF-1beta C-terminal deletion mutant in transgenic mice produces renal cysts, increased cell proliferation, and dilatation of the ureter similar to mice with kidney-specific inactivation of HNF-1beta. Pkhd1 expression is inhibited in cystic collecting ducts but not in non-cystic proximal tubules, despite transgene expression in this nephron segment. We conclude that the C-terminal domain of HNF-1beta is required for the activation of the Pkhd1 promoter. Deletion mutants lacking the C-terminal domain function as dominant-negative mutants, possibly by preventing the recruitment of histone acetylases to the promoter. Cyst formation correlates with inhibition of Pkhd1 expression, which argues that mutations of HNF-1beta produce kidney cysts by down-regulating the ARPKD gene, Pkhd1. Expression of HNF-1alpha in proximal tubules may protect against cystogenesis.
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MESH Headings
- Acetyltransferases/metabolism
- Animals
- Binding Sites
- Butyrates/pharmacology
- Cell Proliferation
- DNA/chemistry
- DNA-Binding Proteins/chemistry
- Dimerization
- Down-Regulation
- Epithelial Cells/cytology
- Gene Deletion
- Genes, Dominant
- Genes, Reporter
- HeLa Cells
- Hepatocyte Nuclear Factor 1-beta
- Histone Acetyltransferases
- Humans
- Immunoprecipitation
- Isobutyrates
- Kidney/cytology
- Kidney/metabolism
- Kidney Diseases, Cystic/metabolism
- Kidney Tubules/cytology
- Lectins
- Mice
- Mice, Transgenic
- Microscopy, Fluorescence
- Mutation
- Plasmids/metabolism
- Promoter Regions, Genetic
- Protein Binding
- Protein Structure, Tertiary
- RNA, Messenger/metabolism
- Receptors, Cell Surface/chemistry
- Receptors, Cell Surface/physiology
- Transcription Factors/chemistry
- Transcription, Genetic
- Transfection
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Affiliation(s)
- Thomas Hiesberger
- Department of Internal Medicine, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas 75390-8856, USA.
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Gardner-Stephen DA, Gregory PA, Mackenzie PI. Identification and Characterization of Functional Hepatocyte Nuclear Factor 1‐Binding Sites in UDP‐Glucuronosyltransferase Genes. Methods Enzymol 2005; 400:22-46. [PMID: 16399341 DOI: 10.1016/s0076-6879(05)00002-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The hepatocyte nuclear factor 1 (HNF1) transcription factor family is composed of two closely related homeodomain proteins with similar but distinct expression profiles. Homodimers and heterodimers of these transcription factors, HNF1alpha and HNF1beta, increase transcription from target genes through direct physical interaction with one or more elements of sufficient similarity to a 13 nucleotide-inverted dyad consensus-binding sequence. Potential HNF1-binding sites have been found in the proximal upstream regulatory regions of most known human UDP-glucuronosyltransferase (UGT) genes. As the liver and gastrointestinal tract are both important sites of glucuronidation and express significant levels of one or both HNF1 proteins, it is thought that these homeoproteins may play a role in transcriptional regulation of UGTs. This chapter explores the current evidence that HNF1 transcription factors are explicitly involved in the transcription of mammalian UGT genes. Most data supporting this hypothesis come from in vitro reporter assays, site-directed mutagenesis, and electrophoretic mobility-shift assays, for which methods are detailed. However, as in vitro functionality of transcription factors does not necessarily imply significance in vivo, some of the limitations of these techniques are also examined. In addition, available in vivo data are discussed, with particular attention given to contributions made by HNF1alpha knockout mouse models and microarray studies of human tissue. Finally, possible scenarios in which HNF1-mediated regulation of UGT expression may be clinically relevant are suggested.
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Affiliation(s)
- Dione A Gardner-Stephen
- Department of Clinical Oncology, Flinders University School of Medicine, Flinders-Medical Center, Adelaide, Australia
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46
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Xu J, Capezzone M, Xu X, Hershman JM. Activation of nicotinamide N-methyltransferase gene promoter by hepatocyte nuclear factor-1beta in human papillary thyroid cancer cells. Mol Endocrinol 2004; 19:527-39. [PMID: 15486044 DOI: 10.1210/me.2004-0215] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
We previously demonstrated that the human nicotinamide N-methytransferase (NNMT) gene was highly expressed in many papillary thyroid cancers and cell lines. The expression in other papillary and follicular cancers or cell lines and normal thyroid cells was low or undetectable. To gain an understanding of the molecular mechanism of this cell-specific expression, the NNMT promoter was cloned and studied by luciferase reporter gene assay. The promoter construct was expressed highly in papillary cancer cell lines, including those with higher (e.g. BHP 2-7) and lower (e.g. BHP 14-9) NNMT gene expression, and expressed weakly in follicular thyroid cancer cell lines. Further study with 5'-deletion promoter construct suggested that the NNMT promoter was regulated differently in BHP 2-7 and BHP 14-9 cells. In BHP 2-7 cells, promoter activity was dependent on an upstream sequence. In BHP 14-9 cells, sequence in the basal promoter region contributed notably to the overall promoter activity. RT-PCR or Western blot analysis indicated that hepatocyte nuclear factor-1beta (HNF-1beta) was expressed in only papillary cancer cell lines with high NNMT gene expression. HNF-1beta was not expressed or expressed very weakly in other papillary, follicular, and Hurthle cancer cell lines and primary cultures of normal thyroid cells and benign thyroid conditions. A HNF-1 binding site was identified in the NNMT basal promoter region. Mutations in this site decreased NNMT promoter activity in the HNF-1beta-positive BHP 2-7 cells, but not in the HNF-1beta-negative BHP 14-9 cells. HNF-1beta bound to the HNF-1 site specifically as a homodimer as determined by gel retardation assays with HNF-1beta-specific antibody. Cotransfection of a HNF-1beta expression plasmid increased NNMT promoter activity significantly in both HNF-1beta-positive and -negative thyroid cancer cell lines and Hep G2 liver cancer cells. Furthermore, transient expression of HNF-1beta in BHP 14-9 cells increased endogenous NNMT protein levels. In summary, HNF-1beta functions as a transcription activator for NNMT gene expression in some papillary thyroid cancer cells.
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Affiliation(s)
- Jimin Xu
- Endocrinology and Diabetes Division, Veterans Affairs Greater Los Angeles Healthcare System, 11301 Wilshire Boulevard, Los Angeles, California 90073, USA
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47
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Wu G, Bohn S, Ryffel GU. The HNF1β transcription factor has several domains involved in nephrogenesis and partially rescues Pax8/lim1-induced kidney malformations. ACTA ACUST UNITED AC 2004; 271:3715-28. [PMID: 15355349 DOI: 10.1111/j.1432-1033.2004.04312.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The tissue-specific transcription factors HNF1alpha and HNF1beta are closely related homeodomain proteins conserved in vertebrate evolution. Heterozygous mutations in human HNF1beta but not in HNF1alpha genes are associated with kidney malformations. Overexpression of HNF1beta in Xenopus embryos leads to defective pronephros development, while HNF1alpha has no effect. We have defined the regions responsible for this functional difference between HNF1beta and HNF1alpha in transfected HeLa cells as well as in injected Xenopus embryos. Using domain swapping experiments, we located a nuclear localization signal in the POUH domain of HNF1beta, and showed that the POUS and POUH domains of HNF1beta mediate a high transactivation potential in transfected cells. In injected Xenopus embryos three HNF1beta domains are involved in nephrogenesis. These include the dimerization domain, the 26 amino acid segment specific for splice variant A as well as the POUH domain. As HNF1beta together with Pax8 and lim1 constitute the earliest regulators in the pronephric anlage, it is possible that they cooperate during early nephrogenesis. We have shown here that HNF1beta can overcome the enlargement and the induction of an ectopic pronephros mediated by overexpression of Pax8 and lim1. However, the phenotype induced by Pax8 and lim1 overexpression and characterized by cyst-like structures and thickening of the pronephric tubules was not altered by HNF1beta overexpression. Taken together, HNF1beta acts antagonistically to Pax8 and lim1 in only some processes during nephrogenesis, and a simple antagonistic relationship does not completely describe the functions of these genes. We conclude that HNF1beta has some distinct morphogenetic properties during nephrogenesis.
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Affiliation(s)
- Guizhi Wu
- Institut für Zellbiologie, Universitätsklinikum Essen, Germany
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48
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Tanaka T, Tomaru Y, Nomura Y, Miura H, Suzuki M, Hayashizaki Y. Comprehensive search for HNF-1beta-regulated genes in mouse hepatoma cells perturbed by transcription regulatory factor-targeted RNAi. Nucleic Acids Res 2004; 32:2740-50. [PMID: 15148361 PMCID: PMC419602 DOI: 10.1093/nar/gkh597] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The identification of genes targeted by a specific transcription regulatory factor (TRF) is essential to our understanding of the regulatory mechanism of gene expression. We constructed a system for the comprehensive identification of genes directly regulated by a TRF. It includes a combination of perturbation of gene expression by RNA interference (RNAi) of the TRF, cDNA microarray analysis, computer searches for the putative TRF recognition sequences, and in vivo and in vitro TRF-DNA binding assays. Endogenous hepatocyte nuclear factor-1beta (HNF-1beta) mRNA was efficiently degraded by transfection of mouse hepatoma cells with short interfering RNAs. Expression profile analysis with 20 K mouse cDNA microarrays detected 243 genes whose expression levels were decreased by >50% upon RNAi of HNF-1beta. The upstream regions of the top 26 downregulated genes were searched for the HNF-1beta consensus recognition sequences leading to the extraction of 13 candidate genes. Finally, TRF-DNA binding assays identified five novel as well as three known HNF-1beta-regulated genes. In combination with quantitative real-time RT-PCR, the present system revealed the existence of a more expanded regulatory network among seven HNF family members, demonstrating its practicability to identify the TRF network as well as genes directly regulated by a specific TRF.
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Affiliation(s)
- Taku Tanaka
- Division of Genomics, Science of Biological Supramolecular Systems, Graduate School of Integrated Science, Yokohama City University, 1-7-29 Suehiro-Cho, Tusurumi-Ku, Yokohama, Kanagawa 230-0045, Japan
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Haumaitre C, Reber M, Cereghini S. Functions of HNF1 family members in differentiation of the visceral endoderm cell lineage. J Biol Chem 2003; 278:40933-42. [PMID: 12860991 DOI: 10.1074/jbc.m304372200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The two members of the hepatocyte nuclear factor 1 (HNF1) transcription factor family, HNF1 and variant HNF1 (vHNF1), show a strong homology in their atypical POU-homeodomain and dimerization domain but differ in their transactivation domains. Moreover, two vHNF1 isoforms generated by alternative splicing are present in all tissues expressing this gene. vHnf1-deficient mouse embryos die soon after implantation due to defective visceral endoderm formation, an extraembryonic tissue essential for development and survival of the embryo proper. In contrast, invalidation of Hnf1, which is expressed at later developmental stages than vHnf1, does not lead to embryonic lethality or developmental defects. To examine the specific or potential equivalent functions of vHNF1 isoforms and HNF1 during the process of visceral endoderm differentiation, we stably reexpressed these factors in vHnf1-deficient embryonic stem cells. Analysis of these embryonic stem cells upon differentiation into embryoid bodies shows that vHNF1 isoforms exhibit specific behaviors depending on particular target genes and cooperate in the establishment of a functional visceral endoderm. Furthermore, forced expression of HNF1 in vHnf1-deficient embryonic stem cells fully restores the formation of a mature visceral endoderm with the correct expression profile of early and late markers of this lineage. Thus, in this context, HNF1 functionally replaces both vHNF1 isoforms, suggesting that the different developmental functions of these transcription factors are mainly due to the acquisition of novel expression patterns.
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Affiliation(s)
- Cécile Haumaitre
- Unité 423 INSERM, Hôpital Necker-Enfants Malades, 149 Rue de Sèvres, 75015 Paris, France
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50
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Abstract
The homeodomain-containing transcription factor pancreatic duodenal homeobox 1 (PDX-1) plays a key role in pancreas development and in beta-cell function. Upstream sequences of the gene up to about -6 kb show islet-specific activity in transgenic mice. Attempts to identify functional regulatory elements involved in the controlled expression of the pdx-1 gene led to the identification of distinct distal beta-cell-specific enhancers in human and rat genes. Three additional sequences, conserved between the mouse and the human 5'-flanking regions, two of which are also found in the chicken gene, conferred beta-cell-specific expression on a reporter gene, albeit to different extents. A number of transcription factors binding to and modulating the transcriptional activity of the regulatory elements were identified, such as hepatocyte nuclear factor (HNF)-3beta, HNF-1alpha, SP1/3, and, interestingly, PDX-1 itself. A fourth conserved region was localized to the proximal promoter around an E-box motif and was found to bind members of the upstream stimulatory factor (USF) family of transcription factors. We postulate that disruption of pdx-1 cis-acting regulatory sequences and/or mutations or functional impairment of transcription factors controlling the expression of the gene can lead to diabetes.
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Affiliation(s)
- Danielle Melloul
- Department of Endocrinology and Metabolism, Hadassah University Hospital, Jerusalem, Israel.
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