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Nanda JS, Awadallah WN, Kohrt SE, Popovics P, Cates JMM, Mirosevich J, Clark PE, Giannico GA, Grabowska MM. Increased nuclear factor I/B expression in prostate cancer correlates with AR expression. Prostate 2020; 80:1058-1070. [PMID: 32692871 PMCID: PMC7434711 DOI: 10.1002/pros.24019] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 04/17/2020] [Accepted: 05/11/2020] [Indexed: 11/09/2022]
Abstract
BACKGROUND Most prostate cancers express androgen receptor (AR), and our previous studies have focused on identifying transcription factors that modify AR function. We have shown that nuclear factor I/B (NFIB) regulates AR activity in androgen-dependent prostate cancer cells in vitro. However, the status of NFIB in prostate cancer was unknown. METHODS We immunostained a tissue microarray including normal, hyperplastic, prostatic intraepithelial neoplasia, primary prostatic adenocarcinoma, and castration-resistant prostate cancer tissue samples for NFIB, AR, and synaptophysin, a marker of neuroendocrine differentiation. We interrogated publically available data sets in cBioPortal to correlate NFIB expression and AR and neuroendocrine prostate cancer (NEPCa) activity scores. We analyzed prostate cancer cell lines for NFIB expression via Western blot analysis and used nuclear and cytoplasmic fractionation to assess where NFIB is localized. We performed co-immunoprecipitation studies to determine if NFIB and AR interact. RESULTS NFIB increased in the nucleus and cytoplasm of prostate cancer samples versus matched normal controls, independent of Gleason score. Similarly, cytoplasmic AR and synaptophysin increased in primary prostate cancer. We observed strong NFIB staining in primary small cell prostate cancer. The ratio of cytoplasmic-to-nuclear NFIB staining was predictive of earlier biochemical recurrence in prostate cancer, once adjusted for tumor margin status. Cytoplasmic AR was an independent predictor of biochemical recurrence. There was no statistically significant difference between NFIB and synaptophysin expression in primary and castration-resistant prostate cancer, but cytoplasmic AR expression was increased in castration-resistant samples. In primary prostate cancer, nuclear NFIB expression correlated with cytoplasmic NFIB and nuclear AR, while cytoplasmic NFIB correlated with synaptophysin, and nuclear and cytoplasmic AR. In castration-resistant prostate cancer samples, NFIB expression correlated positively with an AR activity score, and negatively with the NEPCa score. In prostate cancer cell lines, NFIB exists in several isoforms. We observed NFIB predominantly in the nuclear fraction of prostate cancer cells with increased cytoplasmic expression seen in castration-resistant cell lines. We observed an interaction between AR and NFIB through co-immunoprecipitation experiments. CONCLUSION We have described the expression pattern of NFIB in primary and castration-resistant prostate cancer and its positive correlation with AR. We have also demonstrated AR interacts with NFIB.
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Affiliation(s)
- Jagpreet S. Nanda
- Department of Urology, Case Western Reserve University, Cleveland, OH
| | | | - Sarah E. Kohrt
- Department of Pharmacology, Case Western Reserve University, Cleveland, OH
| | - Petra Popovics
- Department of Urology, Case Western Reserve University, Cleveland, OH
| | - Justin M. M. Cates
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN
| | - Janni Mirosevich
- Department of Urology, Vanderbilt University Medical Center, Nashville, TN
| | - Peter E. Clark
- Department of Urology, Levine Cancer Center/Atrium Health, Charlotte, NC
| | - Giovanna A. Giannico
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN
| | - Magdalena M. Grabowska
- Department of Urology, Case Western Reserve University, Cleveland, OH
- Department of Pharmacology, Case Western Reserve University, Cleveland, OH
- Department of Biochemistry, Case Western Reserve University, Cleveland, OH
- Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH
- Address correspondence to: Magdalena M. Grabowska, 2123 Adelbert Road, Wood Research Tower; RTG00, Cleveland, OH 44106, Phone: 216-368-5736,
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Le-Bel G, Cortez Ghio S, Guérin LP, Bisson F, Germain L, Guérin SL. Irradiated Human Fibroblasts as a Substitute Feeder Layer to Irradiated Mouse 3T3 for the Culture of Human Corneal Epithelial Cells: Impact on the Stability of the Transcription Factors Sp1 and NFI. Int J Mol Sci 2019; 20:ijms20246296. [PMID: 31847118 PMCID: PMC6940969 DOI: 10.3390/ijms20246296] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 12/03/2019] [Accepted: 12/09/2019] [Indexed: 12/26/2022] Open
Abstract
Because of the worldwide shortage of graftable corneas, alternatives to restore visual impairments, such as the production of a functional human cornea by tissue engineering, have emerged. Self-renewal of the corneal epithelium through the maintenance of a sub-population of corneal stem cells is required to maintain the functionality of such a reconstructed cornea. We previously reported an association between stem cell differentiation and the level to which they express the transcription factors Sp1 and NFI. In this study, we investigated the impact of replacing irradiated 3T3 (i3T3) murine fibroblast feeder cells by irradiated human corneal fibroblasts (iHFL) on the expression of Sp1 and NFI and evaluated their contribution to the proliferative properties of human corneal epithelial cells (hCECs) in both monolayer cultures and human tissue engineered corneas (hTECs). hCECs co-cultured with iHFL could be maintained for up to two more passages than when they were grown with i3T3. Western Blot and electrophoretic mobility shift assays (EMSAs) revealed no significant difference in the feeder-layer dependent increase in Sp1 at both the protein and DNA binding level, respectively, between HCECs grown with either i3T3 or iHFL. On the other hand, a significant increase in the expression and DNA binding of NFI was observed at each subsequent passage when hCECs were co-cultured along with i3T3. These changes were found to result from an increased expression of the NFIA and NFIB isoforms in hCECs grown with i3T3. Exposure of hCECs to cycloheximide revealed an increased stability of NFIB that likely resulted from post-translational glycosylation of this protein when these cells were co-cultured with i3T3. In addition, iHFL were as efficient as i3T3 at preserving corneal, slow-cycling, epithelial stem cells in the basal epithelium of the reconstructed hTECs. Furthermore, we observed an increased expression of genes whose encoded products promote hCECs differentiation along several passages in hCECs co-cultured with either type of feeder layer. Therefore, the iHFL feeder layer appears to be the most effective at maintaining the proliferative properties of hCECs in culture most likely by preserving high levels of Sp1 and low levels of NFIB, which is known for its gene repressor and cell differentiation properties.
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Affiliation(s)
- Gaëtan Le-Bel
- Centre LOEX de l’Université Laval, Génie Tissulaire et Régénération, Centre de Recherche du CHU de Québec -Université Laval, Axe Médecine Régénératrice, Québec, QC G1V 0A6, Canada; (G.L.-B.); (S.C.G.); (L.-P.G.); (F.B.); (L.G.)
- Centre Universitaire d’Ophtalmologie (CUO)-Recherche, Centre de recherche FRQS du CHU de Québec, Axe Médecine Régénératrice, Québec, QC G1J 1Z4, Canada
- Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Sergio Cortez Ghio
- Centre LOEX de l’Université Laval, Génie Tissulaire et Régénération, Centre de Recherche du CHU de Québec -Université Laval, Axe Médecine Régénératrice, Québec, QC G1V 0A6, Canada; (G.L.-B.); (S.C.G.); (L.-P.G.); (F.B.); (L.G.)
- Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Louis-Philippe Guérin
- Centre LOEX de l’Université Laval, Génie Tissulaire et Régénération, Centre de Recherche du CHU de Québec -Université Laval, Axe Médecine Régénératrice, Québec, QC G1V 0A6, Canada; (G.L.-B.); (S.C.G.); (L.-P.G.); (F.B.); (L.G.)
- Département d’Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Francis Bisson
- Centre LOEX de l’Université Laval, Génie Tissulaire et Régénération, Centre de Recherche du CHU de Québec -Université Laval, Axe Médecine Régénératrice, Québec, QC G1V 0A6, Canada; (G.L.-B.); (S.C.G.); (L.-P.G.); (F.B.); (L.G.)
- Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Lucie Germain
- Centre LOEX de l’Université Laval, Génie Tissulaire et Régénération, Centre de Recherche du CHU de Québec -Université Laval, Axe Médecine Régénératrice, Québec, QC G1V 0A6, Canada; (G.L.-B.); (S.C.G.); (L.-P.G.); (F.B.); (L.G.)
- Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC G1V 0A6, Canada
- Département d’Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Sylvain L. Guérin
- Centre LOEX de l’Université Laval, Génie Tissulaire et Régénération, Centre de Recherche du CHU de Québec -Université Laval, Axe Médecine Régénératrice, Québec, QC G1V 0A6, Canada; (G.L.-B.); (S.C.G.); (L.-P.G.); (F.B.); (L.G.)
- Centre Universitaire d’Ophtalmologie (CUO)-Recherche, Centre de recherche FRQS du CHU de Québec, Axe Médecine Régénératrice, Québec, QC G1J 1Z4, Canada
- Département d’Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC G1V 0A6, Canada
- Correspondence: ; Tel.: +1-418-682-7565
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Le-Bel G, Giasson CJ, Deschambeault A, Carrier P, Germain L, Guérin SL. The presence of a feeder layer improves human corneal endothelial cell proliferation by altering the expression of the transcription factors Sp1 and NFI. Exp Eye Res 2018; 176:161-173. [PMID: 30003884 DOI: 10.1016/j.exer.2018.07.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 06/13/2018] [Accepted: 07/06/2018] [Indexed: 12/13/2022]
Abstract
Based on the use of tissue-cultured human corneal endothelial cells (HCECs), cell therapy is a very promising avenue in the treatment of corneal endothelial pathologies such as Fuchs' dystrophy, and post-surgical corneal edema. However, once in culture, HCECs rapidly lose their phenotypic and physiological characteristics, and are therefore unsuitable for the reconstruction of a functional endothelial monolayer. Expression of NFI, a transcription factor that can either function as an activator or a repressor of gene transcription, has never been examined in endothelial cells. The present study therefore aimed to determine the impact of a non-proliferating, lethally irradiated i3T3 feeder layer on the maintenance of HCEC's morphological characteristics, and both the expression and stability of Sp1 (a strong transcriptional activator) and NFI in such cells. The typical morphology of endothelial cells was best maintained when 8 × 103/cm2 HCECs were co-cultured in the presence of 2 × 104 cells/cm2 i3T3. HCECs were found to express both Sp1 and NFI in vitro. Also, the presence of i3T3 led to higher levels of Sp1 and NFI in HCECs, with a concomitant increase in their DNA binding levels (assessed by electrophoretic mobility shift assays (EMSA)). Specifically, i3T3 increased the expression of the NFIA, NFIB and NFIC isoforms, without a noticeable increase in their mRNAs (as revealed by gene profiling on microarray). Gene profiling analysis also identified a few feeder layer-dependent, differentially regulated genes whose protein products may contribute to improving the properties of HCECs in culture. Therefore, co-culturing HCECs with an i3T3 feeder layer clearly improves their morphological characteristics by maintaining stable levels of Sp1 and NFI in cell culture.
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Affiliation(s)
- Gaëtan Le-Bel
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada; Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC, Canada and
| | - Claude J Giasson
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; École d'Optométrie, Université de Montréal, Montréal, Québec, Canada
| | - Alexandre Deschambeault
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC, Canada and
| | - Patrick Carrier
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC, Canada and
| | - Lucie Germain
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada; Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC, Canada and
| | - Sylvain L Guérin
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada.
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The convergent roles of the nuclear factor I transcription factors in development and cancer. Cancer Lett 2017; 410:124-138. [PMID: 28962832 DOI: 10.1016/j.canlet.2017.09.015] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Revised: 09/11/2017] [Accepted: 09/16/2017] [Indexed: 02/07/2023]
Abstract
The nuclear factor I (NFI) transcription factors play important roles during normal development and have been associated with developmental abnormalities in humans. All four family members, NFIA, NFIB, NFIC and NFIX, have a homologous DNA binding domain and function by regulating cell proliferation and differentiation via the transcriptional control of their target genes. More recently, NFI genes have also been implicated in cancer based on genomic analyses and studies of animal models in a variety of tumours across multiple organ systems. However, the association between their functions in development and in cancer is not well described. In this review, we summarise the evidence suggesting a converging role for the NFI genes in development and cancer. Our review includes all cancer types in which the NFI genes are implicated, focusing predominantly on studies demonstrating their oncogenic or tumour-suppressive potential. We conclude by presenting the challenges impeding our understanding of NFI function in cancer biology, and demonstrate how a developmental perspective may contribute towards overcoming such hurdles.
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Lee A, Miller D, Henry R, Paruchuri VDP, O'Meally RN, Boronina T, Cole RN, Zachara NE. Combined Antibody/Lectin Enrichment Identifies Extensive Changes in the O-GlcNAc Sub-proteome upon Oxidative Stress. J Proteome Res 2016; 15:4318-4336. [PMID: 27669760 DOI: 10.1021/acs.jproteome.6b00369] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
O-Linked N-acetyl-β-d-glucosamine (O-GlcNAc) is a dynamic post-translational modification that modifies and regulates over 3000 nuclear, cytoplasmic, and mitochondrial proteins. Upon exposure to stress and injury, cells and tissues increase the O-GlcNAc modification, or O-GlcNAcylation, of numerous proteins promoting the cellular stress response and thus survival. The aim of this study was to identify proteins that are differentially O-GlcNAcylated upon acute oxidative stress (H2O2) to provide insight into the mechanisms by which O-GlcNAc promotes survival. We achieved this goal by employing Stable Isotope Labeling of Amino Acids in Cell Culture (SILAC) and a novel "G5-lectibody" immunoprecipitation strategy that combines four O-GlcNAc-specific antibodies (CTD110.6, RL2, HGAC39, and HGAC85) and the lectin WGA. Using the G5-lectibody column in combination with basic reversed phase chromatography and C18 RPLC-MS/MS, 990 proteins were identified and quantified. Hundreds of proteins that were identified demonstrated increased (>250) or decreased (>110) association with the G5-lectibody column upon oxidative stress, of which we validated the O-GlcNAcylation status of 24 proteins. Analysis of proteins with altered glycosylation suggests that stress-induced changes in O-GlcNAcylation cluster into pathways known to regulate the cell's response to injury and include protein folding, transcriptional regulation, epigenetics, and proteins involved in RNA biogenesis. Together, these data suggest that stress-induced O-GlcNAcylation regulates numerous and diverse cellular pathways to promote cell and tissue survival.
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Affiliation(s)
- Albert Lee
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
| | - Devin Miller
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
| | - Roger Henry
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
| | - Venkata D P Paruchuri
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
| | - Robert N O'Meally
- Mass Spectrometry and Proteomics Facility, The Johns Hopkins University School of Medicine , 733 North Broadway Street, Baltimore, Maryland 21205-2185, United States
| | - Tatiana Boronina
- Mass Spectrometry and Proteomics Facility, The Johns Hopkins University School of Medicine , 733 North Broadway Street, Baltimore, Maryland 21205-2185, United States
| | - Robert N Cole
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States.,Mass Spectrometry and Proteomics Facility, The Johns Hopkins University School of Medicine , 733 North Broadway Street, Baltimore, Maryland 21205-2185, United States
| | - Natasha E Zachara
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
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Duval C, Zaniolo K, Leclerc S, Salesse C, Guérin SL. Characterization of the human α9 integrin subunit gene: Promoter analysis and transcriptional regulation in ocular cells. Exp Eye Res 2015; 135:146-63. [PMID: 25746835 DOI: 10.1016/j.exer.2015.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 01/26/2015] [Accepted: 03/02/2015] [Indexed: 11/29/2022]
Abstract
α9β1 is the most recent addition to the integrin family of membrane receptors and consequently remains the one that is the least characterized. To better understand how transcription of the human gene encoding the α9 subunit is regulated, we cloned the α9 promoter and characterized the regulatory elements that are required to ensure its transcription. Transfection of α9 promoter/CAT plasmids in primary cultured human corneal epithelial cells (HCECs) and uveal melanoma cell lines demonstrated the presence of both negative and positive regulatory elements along the α9 promoter and positioned the basal α9 promoter to within 118 bp from the α9 mRNA start site. In vitro DNaseI footprinting and in vivo ChIP analyses demonstrated the binding of the transcription factors Sp1, c-Myb and NFI to the most upstream α9 negative regulatory element. The transcription factors Sp1 and NFI were found to bind the basal α9 promoter individually but Sp1 binding clearly predominates when both transcription factors are present in the same extract. Suppression of Sp1 expression through RNAi also caused a dramatic reduction in the expression of the α9 gene. Most of all, addition of tenascin-C (TNC), the ligand of α9β1, to the tissue culture plates prior to seeding HCECs increased α9 transcription whereas it simultaneously decreased expression of the α5 integrin subunit gene. This dual regulatory action of TNC on the transcription of the α9 and α5 genes suggests that both these integrins must work together to appropriately regulate cell adhesion, migration and differentiation that are hallmarks of tissue wound healing.
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Affiliation(s)
- Céline Duval
- Centre Universitaire d'Ophtalmologie-Recherche, Axe Médecine Régénératrice, Hôpital du Saint-Sacrement, Centre de Recherche FRQS du CHU de Québec, Québec, Canada
| | - Karine Zaniolo
- Centre Universitaire d'Ophtalmologie-Recherche, Axe Médecine Régénératrice, Hôpital du Saint-Sacrement, Centre de Recherche FRQS du CHU de Québec, Québec, Canada
| | - Steeve Leclerc
- Centre Universitaire d'Ophtalmologie-Recherche, Axe Médecine Régénératrice, Hôpital du Saint-Sacrement, Centre de Recherche FRQS du CHU de Québec, Québec, Canada
| | - Christian Salesse
- Centre Universitaire d'Ophtalmologie-Recherche, Axe Médecine Régénératrice, Hôpital du Saint-Sacrement, Centre de Recherche FRQS du CHU de Québec, Québec, Canada; Département d'Ophtalmologie, Faculté de Médecine, Université Laval, Québec, QC, Canada
| | - Sylvain L Guérin
- Centre Universitaire d'Ophtalmologie-Recherche, Axe Médecine Régénératrice, Hôpital du Saint-Sacrement, Centre de Recherche FRQS du CHU de Québec, Québec, Canada; Département d'Ophtalmologie, Faculté de Médecine, Université Laval, Québec, QC, Canada.
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Robinson GW, Kang K, Yoo KH, Tang Y, Zhu BM, Yamaji D, Colditz V, Jang SJ, Gronostajski RM, Hennighausen L. Coregulation of genetic programs by the transcription factors NFIB and STAT5. Mol Endocrinol 2014; 28:758-67. [PMID: 24678731 DOI: 10.1210/me.2012-1387] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Mammary-specific genetic programs are activated during pregnancy by the common transcription factor signal transducer and activator of transcription (STAT) 5. More than one third of these genes carry nuclear factor I/B (NFIB) binding motifs that coincide with STAT5 in vivo binding, suggesting functional synergy between these two transcription factors. The role of NFIB in this governance was investigated in mice from which Nfib had been inactivated in mammary stem cells or in differentiating alveolar epithelium. Although NFIB was not required for alveolar expansion, the combined absence of NFIB and STAT5 prevented the formation of functional alveoli. NFIB controlled the expression of mammary-specific and STAT5-regulated genes and chromatin immunoprecipitation-sequencing established STAT5 and NFIB binding at composite regulatory elements containing histone H3 lysine dimethylation enhancer marks and progesterone receptor binding. By integrating previously published chromatin immunoprecipitation-sequencing data sets, the presence of NFIB-STAT5 modules in other cell types was investigated. Notably, genomic sites bound by NFIB in hair follicle stem cells were also occupied by STAT5 in mammary epithelium and coincided with enhancer marks. Many of these genes were under NFIB control in both hair follicle stem cells and mammary alveolar epithelium. We propose that NFIB-STAT5 modules, possibly in conjunction with other transcription factors, control cell-specific genetic programs.
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Affiliation(s)
- Gertraud W Robinson
- Laboratory of Genetics and Physiology (G.W.R., K.K., K.H.Y., Y.T., D.Y., V.C., S.J.J., L.H.), National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892; Department of Microbiology (K.K.), Dankook University, Cheonan 330-714, Republic of Korea; Chengdu University of Traditional Chinese Medicine (Y.T.), Chengdu 610072, Republic of China; Key Laboratory of Acupuncture and Medicine (B.-M.Z.), Nanjing University of Traditional Chinese Medicine, Nanjing 210046, Republic of China; and New York State Center of Excellence in Bioinformatics and Life Sciences (R.M.G.), Department of Biochemistry, Developmental Genomics Group, University at Buffalo, Buffalo, New York 14203
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Ly M, Valent A, Diallo G, Penault-Lorca F, Dumke K, Marty V, Viehl P, Lazar V, Job B, Richon C, Scott V, Diallo DA, Bernaudin JF, Andre F. Gene copy number variations in breast cancer of Sub-Saharan African women. Breast 2013; 22:295-300. [PMID: 22999459 DOI: 10.1016/j.breast.2012.07.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 02/28/2012] [Accepted: 07/08/2012] [Indexed: 12/23/2022] Open
Abstract
The goal of this study was CGH array profiling of breast cancer from Malian women in order to define differences with those from USA. CGH array was performed in 28 samples, 17 with a triple negative phenotype. The profiles were compared to those of 106 tumors from USA. 6 chromosomal regions (6p21, 9q34, 11q13, 12q24, 17q25 and 22q12.1-22q13.1) were identified with a significant higher rate of copy number alterations. These regions contain several genes of interest including BCR. FISH and IHC confirmed that BCR was amplified and overexpressed particularly in triple negative tumors. Finally, 5 regions presented a high level of amplification in two or more samples, including 2 regions located between 9p22.3-9p23 and 9p23-9p24.1. This study confirms that breast cancers from African women present biological differences with those from USA. Larger studies are needed to go further in the identification of therapeutic targets that would be specific to African women.
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Affiliation(s)
- Madani Ly
- Service d'Hématologie et d'Oncologie Médicale, Hôpital du point G, Bamako, Mali
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Duval C, Gaudreault M, Vigneault F, Touzel-Deschênes L, Rochette PJ, Masson-Gadais B, Germain L, Guérin SL. Rescue of the transcription factors Sp1 and NFI in human skin keratinocytes through a feeder-layer-dependent suppression of the proteasome activity. J Mol Biol 2012; 418:281-99. [PMID: 22420942 DOI: 10.1016/j.jmb.2012.01.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Revised: 01/17/2012] [Accepted: 01/19/2012] [Indexed: 12/01/2022]
Abstract
Co-culturing human skin keratinocytes along with a feeder layer has proven to considerably improve their proliferative properties by delaying massive induction of terminal differentiation. Through a yet unclear mechanism, we recently reported that irradiated 3T3 (i3T3) fibroblasts used as a feeder layer increase the nuclear content of Sp1, a positive transcription factor (TF) that plays a critical role in many cellular functions including cell proliferation, into both adult skin keratinocytes and newborn skin keratinocytes. In this study, we examined the influence of i3T3 on the expression and DNA binding of NFI, another TF important for cell proliferation and cell cycle progression, and attempted to decipher the mechanism by which the feeder layer contributes at maintaining higher levels of these TFs in skin keratinocytes. Our results indicate that co-culturing both adult skin keratinocytes and newborn skin keratinocytes along with a feeder layer dramatically increases glycosylation of NFI and may prevent it from being degraded by the proteasome.
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Affiliation(s)
- Céline Duval
- LOEX/CUO-Recherche, Hôpital du Saint-Sacrement, Centre de Recherche du CHA, Québec, QC, Canada G1S4L8
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Nuclear factor one transcription factors in CNS development. Mol Neurobiol 2009; 39:10-23. [PMID: 19058033 DOI: 10.1007/s12035-008-8048-6] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2008] [Accepted: 11/12/2008] [Indexed: 01/22/2023]
Abstract
Transcription factors are key regulators of central nervous system (CNS) development and brain function. Research in this area has now uncovered a new key player-the nuclear factor one (NFI) gene family. It has been almost a decade since the phenotype of the null mouse mutant for the nuclear factor one A transcription factor was reported. Nfia null mice display a striking brain phenotype including agenesis of the corpus callosum and malformation of midline glial populations needed to guide axons of the corpus callosum across the midline of the developing brain. Besides NFIA, there are three other NFI family members in vertebrates: NFIB, NFIC, and NFIX. Since generation of the Nfia knockout (KO) mice, KO mice for all other family members have been generated, and defects in one or more organ systems have been identified for all four NFI family members (collectively referred to as NFI here). Like the Nfia KO mice, the Nfib and Nfix KO mice also display a brain phenotype, with the Nfib KO forebrain phenotype being remarkably similar to that of Nfia. Over the past few years, studies have highlighted NFI as a key payer in a variety of CNS processes including axonal outgrowth and guidance and glial and neuronal cell differentiation. Here, we discuss the importance and role of NFI in these processes in the context of several CNS systems including the neocortex, hippocampus, cerebellum, and spinal cord at both cellular and molecular levels.
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Pérez-Casellas LA, Wang X, Howard KD, Rehage MW, Strong DD, Linkhart TA. Nuclear factor I transcription factors regulate IGF binding protein 5 gene transcription in human osteoblasts. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2008; 1789:78-87. [PMID: 18809517 DOI: 10.1016/j.bbagrm.2008.08.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2008] [Revised: 08/11/2008] [Accepted: 08/26/2008] [Indexed: 11/17/2022]
Abstract
Insulin-like growth factor binding protein 5 (IGFBP5) is expressed in many cell types including osteoblasts and modulates IGF activities. IGFBP5 may affect osteoblasts and bone formation, in part by mechanisms independent of binding IGFs. The highly conserved IGFBP5 proximal promoter within 100 nucleotides of the start of transcription contains functional cis regulatory elements for C/EBP, Myb and AP-2. We report evidence for a functional Nuclear Factor I (NFI) cis element that mediates activation or repression of IGFBP5 transcription by the NFI gene family. All four NFI genes were expressed in human osteoblast cultures and osteosarcoma cell lines. Co-transfection with human IGFBP5 promoter luciferase reporter and murine Nfi expression vectors showed that Nfib was the most active in stimulating transcription. Nfix was less active and Nfia and Nfic were inhibitory. Knockdown of NFIB and NFIC expression using siRNA decreased and increased IGFBP5 expression, respectively. Analysis of IGFBP5 promoter deletion and mutation reporter constructs identified a functional NFI cis element. All four NFI proteins bound the NFI site in electrophoretic mobility shift experiments and NFIB bound in chromatin immunoprecipitation assays. Results suggest that NFI proteins are important regulators of IGFBP5 expression in human osteoblasts and thus in modulating IGFBP5 functions in bone.
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