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Desjardins P, Le-Bel G, Ghio SC, Germain L, Guérin SL. The WNK1 kinase regulates the stability of transcription factors during wound healing of human corneal epithelial cells. J Cell Physiol 2022; 237:2434-2450. [PMID: 35150137 DOI: 10.1002/jcp.30698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 01/19/2022] [Accepted: 01/25/2022] [Indexed: 11/12/2022]
Abstract
Due to its superficial anatomical localization, the cornea is continuously subjected to injuries. Damages to the corneal epithelium trigger important changes in the composition of the extracellular matrix to which the basal human corneal epithelial cells (hCECs) attach. These changes are perceived by membrane-bound integrins and ultimately lead to re-epithelialization of the injured epithelium through intracellular signalin. Among the many downstream targets of the integrin-activated signaling pathways, WNK1 is the kinase whose activity is the most strongly increased during corneal wound healing. We previously demonstrated that pharmacological inhibition of WNK1 prevents proper closure of wounded human tissue-engineered cornea in vitro. In the present study, we investigated the molecular mechanisms by which WNK1 contributes to corneal wound healing. By exploiting transcription factors microarrays, electrophoretic mobility-shift assay, and gene profiling analyses, we demonstrated that the DNA binding properties and expression of numerous transcription factors (TFs), including the well-known, ubiquitous TFs specific protein 1 (Sp1) and activator protein 1 (AP1), were reduced in hCECs upon WNK1 inhibition by WNK463. This process appears to be mediated at least in part by alteration in both the ubiquitination and glycosylation status of these TFs. These changes in TFs activity and expression impacted the transcription of several genes, including that encoding the α5 integrin subunit, a well-known target of both Sp1 and AP1. Gene profiling revealed that only a moderate number of genes in hCECs had their level of expression significantly altered in response to WNK463 exposition. Interestingly, analysis of the microarray data for these deregulated genes using the ingenuity pathway analysis software predicted that hCECs would stop migrating and proliferating but differentiate more when they are grown in the presence of the WNK1 inhibitor. These results demonstrate that WNK1 plays a critical function by orienting hCECs into the appropriate biological response during the process of corneal wound healing.
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Affiliation(s)
- Pascale Desjardins
- Centre Universitaire d'Ophtalmologie - Recherche (CUO-Recherche) et Centre de Recherche du CHU de Québec, Université Laval, Québec City, Québec, Canada.,Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Centre de Recherche du CHU de Québec, Université Laval, Québec City, Québec, Canada.,Département de Chirurgie, Faculté de Médecine, Université Laval, Québec City, Québec, Canada.,Département d'Ophtalmologie, Faculté de Médecine, Université Laval, Québec City, Québec, Canada
| | - Gaëtan Le-Bel
- Centre Universitaire d'Ophtalmologie - Recherche (CUO-Recherche) et Centre de Recherche du CHU de Québec, Université Laval, Québec City, Québec, Canada.,Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Centre de Recherche du CHU de Québec, Université Laval, Québec City, Québec, Canada.,Département de Chirurgie, Faculté de Médecine, Université Laval, Québec City, Québec, Canada.,Département d'Ophtalmologie, Faculté de Médecine, Université Laval, Québec City, Québec, Canada
| | - Sergio C Ghio
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Centre de Recherche du CHU de Québec, Université Laval, Québec City, Québec, Canada.,Département de Chirurgie, Faculté de Médecine, Université Laval, Québec City, Québec, Canada
| | - Lucie Germain
- Centre Universitaire d'Ophtalmologie - Recherche (CUO-Recherche) et Centre de Recherche du CHU de Québec, Université Laval, Québec City, Québec, Canada.,Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Centre de Recherche du CHU de Québec, Université Laval, Québec City, Québec, Canada.,Département de Chirurgie, Faculté de Médecine, Université Laval, Québec City, Québec, Canada.,Département d'Ophtalmologie, Faculté de Médecine, Université Laval, Québec City, Québec, Canada
| | - Sylvain L Guérin
- Centre Universitaire d'Ophtalmologie - Recherche (CUO-Recherche) et Centre de Recherche du CHU de Québec, Université Laval, Québec City, Québec, Canada.,Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Centre de Recherche du CHU de Québec, Université Laval, Québec City, Québec, Canada.,Département d'Ophtalmologie, Faculté de Médecine, Université Laval, Québec City, Québec, Canada
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2
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Kuonen F, Li NY, Haensel D, Patel T, Gaddam S, Yerly L, Rieger K, Aasi S, Oro AE. c-FOS drives reversible basal to squamous cell carcinoma transition. Cell Rep 2021; 37:109774. [PMID: 34610301 PMCID: PMC8515919 DOI: 10.1016/j.celrep.2021.109774] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 06/28/2021] [Accepted: 09/08/2021] [Indexed: 01/22/2023] Open
Abstract
While squamous transdifferentiation within subpopulations of adenocarcinomas represents an important drug resistance problem, its underlying mechanism remains poorly understood. Here, using surface markers of resistant basal cell carcinomas (BCCs) and patient single-cell and bulk transcriptomic data, we uncover the dynamic roadmap of basal to squamous cell carcinoma transition (BST). Experimentally induced BST identifies activator protein 1 (AP-1) family members in regulating tumor plasticity, and we show that c-FOS plays a central role in BST by regulating the accessibility of distinct AP-1 regulatory elements. Remarkably, despite prominent changes in cell morphology and BST marker expression, we show using inducible model systems that c-FOS-mediated BST demonstrates reversibility. Blocking EGFR pathway activation after c-FOS induction partially reverts BST in vitro and prevents BST features in both mouse models and human tumors. Thus, by identifying the molecular basis of BST, our work reveals a therapeutic opportunity targeting plasticity as a mechanism of tumor resistance.
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MESH Headings
- Animals
- Carcinoma, Basal Cell/metabolism
- Carcinoma, Basal Cell/pathology
- Carcinoma, Basal Cell/veterinary
- Carcinoma, Squamous Cell/metabolism
- Carcinoma, Squamous Cell/pathology
- Carcinoma, Squamous Cell/veterinary
- Cell Transdifferentiation/drug effects
- Chromatin Assembly and Disassembly
- Drug Resistance, Neoplasm/genetics
- Humans
- Male
- Mice
- Mice, Inbred NOD
- Mice, SCID
- Mucin-1/metabolism
- Protein Kinase Inhibitors/pharmacology
- Proto-Oncogene Proteins c-fos/antagonists & inhibitors
- Proto-Oncogene Proteins c-fos/genetics
- Proto-Oncogene Proteins c-fos/metabolism
- RNA Interference
- RNA, Small Interfering/metabolism
- Signal Transduction/drug effects
- Transcription Factor AP-1/metabolism
- Transforming Growth Factor beta/antagonists & inhibitors
- Transforming Growth Factor beta/genetics
- Transforming Growth Factor beta/metabolism
- ras Proteins/genetics
- ras Proteins/metabolism
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Affiliation(s)
- François Kuonen
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, USA; Department of Dermatology and Venereology, Hôpital de Beaumont, Lausanne University Hospital Center, 1011 Lausanne, Switzerland.
| | - Nancy Yanzhe Li
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, USA
| | - Daniel Haensel
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, USA
| | - Tiffany Patel
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, USA
| | - Sadhana Gaddam
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, USA
| | - Laura Yerly
- Department of Dermatology and Venereology, Hôpital de Beaumont, Lausanne University Hospital Center, 1011 Lausanne, Switzerland
| | - Kerri Rieger
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, USA
| | - Sumaira Aasi
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, USA
| | - Anthony E Oro
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, USA.
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3
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Yao L, Yan J, Cheng F, Gan L, Huang Y, Zheng L, Fang N. Small Proline-Rich Protein 2B Facilitates Gastric Adenocarcinoma Proliferation via MDM2-p53/p21 Signaling Pathway. Onco Targets Ther 2021; 14:1453-1463. [PMID: 33664578 PMCID: PMC7924129 DOI: 10.2147/ott.s281032] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 01/13/2021] [Indexed: 12/29/2022] Open
Abstract
Background The small proline-rich protein 2B (SPRR2B) was firstly reported as a member of the cross-linked envelope protein in keratinocytes. The effect of SPRR2B in gastric adenocarcinoma (GC) remains unclear. This study initially explored the clinical significance of SPRR2B in GC patients as well as its role in tumor progression. Methods Immunohistochemistry was performed to characterize the expression of SPRR2B in GC tissues and adjacent tissues. The relationship between SPRR2B expression and clinicopathological features of GC patients was analyzed by Chi-square test. Kaplan-Meier method and Cox regression analyses were utilized to identify the prognostic factors of GC. Overexpression and knockdown assays were conducted to investigate possible signaling pathways downstream of SPRR2B. Flow cytometry assays were performed to evaluate cell cycle and apoptosis. Xenograft experiments were performed to validate tumor-related role of SPRR2B in vivo. Results Both mRNA and protein levels of SPRR2B in cancerous tissue were significantly higher than those in non-cancerous tissues. Meanwhile, SPRR2B expression was significantly associated with tumor size and tumor stage. Survival analysis revealed SPRR2B as one of the independent prognosis factors for overall survival of GC patients. Cellular and xenografts data implicated that silencing SPRR2B blocked the cell cycle of GC cells perhaps through MDM2-p53/p21-CDK1 pathway, while overexpressing SPRR2B exhibited opposite effects. Conclusion Our data suggest that SPRR2B may serve as a novel prognostic marker in GC, which functions at least partially by MDM2-p53/p21-CDK1 signaling pathway.
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Affiliation(s)
- Ling Yao
- Department of Gastroenterology, Third Affiliated Hospital of Nanchang University, Nanchang, 330008, Jiangxi Province, People's Republic of China
| | - Jinhua Yan
- Department of Hematology, Third Affiliated Hospital of Nanchang University, Nanchang, 330008, Jiangxi Province, People's Republic of China
| | - Fei Cheng
- Department of Gastroenterology, Third Affiliated Hospital of Nanchang University, Nanchang, 330008, Jiangxi Province, People's Republic of China
| | - Lihong Gan
- Department of Gastroenterology, Third Affiliated Hospital of Nanchang University, Nanchang, 330008, Jiangxi Province, People's Republic of China
| | - Yaqin Huang
- Department of Gastroenterology, Third Affiliated Hospital of Nanchang University, Nanchang, 330008, Jiangxi Province, People's Republic of China
| | - Li Zheng
- Department of Gastroenterology, Third Affiliated Hospital of Nanchang University, Nanchang, 330008, Jiangxi Province, People's Republic of China
| | - Nian Fang
- Department of Gastroenterology, Third Affiliated Hospital of Nanchang University, Nanchang, 330008, Jiangxi Province, People's Republic of China
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4
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Ye CJ, Zhan Y, Yang R, Li Y, Dong R. Single-cell transcriptional profiling identifies a cluster of potential metastasis-associated UBE2C+ cells in immature ovarian teratoma. Biochem Biophys Res Commun 2020; 528:567-573. [PMID: 32505346 DOI: 10.1016/j.bbrc.2020.05.144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 05/19/2020] [Indexed: 12/14/2022]
Abstract
To dissect the disease heterogeneity and identify the underlying cellular and molecular events related to metastasis of immature ovarian teratoma in children, single-cell RNA sequencing was performed for a 2-year-old patient with liver metastases from immature ovarian teratoma. A total of 5976 cells were obtained for further analysis, with a median unique molecular identifier count of 6011 per cell and a median number of 1741 genes detected per cell. Fourteen clusters were recognized, with the main lineages comprising epithelial cells, macrophages, fibroblasts, glial cells, and dendritic cells. Ten subclusters of epithelial cells were further defined, originating from the urinary tract, esophagus, bronchus, lung, skin, and gastrointestinal tract. An undefined UBE2C + population in an active state of proliferation was also identified and its biological processes were related to meiosis and maturation of oocytes. Pseudotime analysis revealed different distributions of epithelial cells in the development trajectory. In conclusion, a cluster of UBE2C + epithelial cells in an active state of proliferation was identified in an immature ovarian teratoma in a child, and may contribute to metastasis by regulating epithelial-mesenchymal transition. These findings help toward understanding the origin of the malignant behaviors, offer a potential biomarker for early determination of the tumor nature, and provide new ideas for the therapy of immature ovarian teratoma in children.
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Affiliation(s)
- Chun-Jing Ye
- Department of Pediatric Surgery, Children's Hospital of Fudan University, and Shanghai Key Laboratory of Birth Defect, Shanghai, 201102, China
| | - Yong Zhan
- Department of Pediatric Surgery, Children's Hospital of Fudan University, and Shanghai Key Laboratory of Birth Defect, Shanghai, 201102, China
| | - Ran Yang
- Department of Pediatric Surgery, Children's Hospital of Fudan University, and Shanghai Key Laboratory of Birth Defect, Shanghai, 201102, China
| | - Yi Li
- Department of Pediatric Surgery, Children's Hospital of Fudan University, and Shanghai Key Laboratory of Birth Defect, Shanghai, 201102, China
| | - Rui Dong
- Department of Pediatric Surgery, Children's Hospital of Fudan University, and Shanghai Key Laboratory of Birth Defect, Shanghai, 201102, China.
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5
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Saraswati S, Lietman CD, Li B, Mathew S, Zent R, Young PP. Small proline-rich repeat 3 is a novel coordinator of PDGFRβ and integrin β1 crosstalk to augment proliferation and matrix synthesis by cardiac fibroblasts. FASEB J 2020; 34:7885-7904. [PMID: 32297675 PMCID: PMC7302973 DOI: 10.1096/fj.201902815r] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 03/04/2020] [Accepted: 03/26/2020] [Indexed: 12/16/2022]
Abstract
Nearly 6 million Americans suffer from heart failure. Increased fibrosis contributes to functional decline of the heart that leads to heart failure. Previously, we identified a mechanosensitive protein, small proline‐rich repeat 3 (SPRR3), in vascular smooth muscle cells of atheromas. In this study, we demonstrate SPRR3 expression in cardiac fibroblasts which is induced in activated fibroblasts following pressure‐induced heart failure. Sprr3 deletion in mice showed preserved cardiac function and reduced interstitial fibrosis in vivo and reduced fibroblast proliferation and collagen expression in vitro. SPRR3 loss resulted in reduced activation of Akt, FAK, ERK, and p38 signaling pathways, which are coordinately regulated by integrins and growth factors. SPRR3 deletion did not impede integrin‐associated functions including cell adhesion, migration, or contraction. SPRR3 loss resulted in reduced activation of PDGFRβ in fibroblasts. This was not due to the reduced PDGFRβ expression levels or decreased binding of the PDGF ligand to PDGFRβ. SPRR3 facilitated the association of integrin β1 with PDGFRβ and subsequently fibroblast proliferation, suggesting a role in PDGFRβ‐Integrin synergy. We postulate that SPRR3 may function as a conduit for the coordinated activation of PDGFRβ by integrin β1, leading to augmentation of fibroblast proliferation and matrix synthesis downstream of biomechanical and growth factor signals.
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Affiliation(s)
- Sarika Saraswati
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Caressa D Lietman
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Bin Li
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Sijo Mathew
- Department of Pharmaceutical Sciences, School of Pharmacy, North Dakota State University, Fargo, ND, USA
| | - Roy Zent
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Pampee P Young
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA.,American Red Cross, Biomedical Division, Washington, DC, USA
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6
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Zhang M, Wang X, Guo F, Jia Q, Liu N, Chen Y, Yan Y, Huang M, Tang H, Deng Y, Huang S, Zhou Z, Zhang L, Zhang L. Cdc42 Deficiency Leads To Epidermal Barrier Dysfunction by Regulating Intercellular Junctions and Keratinization of Epidermal Cells during Mouse Skin Development. Am J Cancer Res 2019; 9:5065-5084. [PMID: 31410202 PMCID: PMC6691388 DOI: 10.7150/thno.34014] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 06/08/2019] [Indexed: 01/19/2023] Open
Abstract
Rationale: Cdc42 is a Rho GTPase that regulates diverse cellular functions. Here, we used genetic techniques to investigate the role of Cdc42 in epidermal development and epidermal barrier formation. Methods: Keratinocyte-restricted Cdc42 knockout mice were generated with the Cre-LoxP system under the keratin 14 (K14) promoter. The skin and other tissues were collected from mutant and wild-type mice, and their cellular, molecular, morphological, and physiological features were analyzed. Results: Loss of Cdc42 in the epidermis in vivo resulted in neonatal lethality and impairment of epidermal barrier formation. Cdc42 deficiency led to the loss of epidermal stem cells. The absence of Cdc42 led to increased thickening of the epidermis, which was associated with increased proliferation and reduced apoptosis of keratinocytes. In addition, Cdc42 deficiency damaged tight junctions, adherens junctions and desmosomes. RNA sequencing results showed that the most significantly altered genes were enriched by the terms of “keratinization” and “cornified envelope” (CE). Among the differentially expressed genes in the CE term, several members of the small proline-rich protein (SPRR) family were upregulated. Further study revealed that there may be a Cdc42-SPRR pathway, which may correlate with epidermal barrier function. Conclusions: Our study indicates that Cdc42 is essential for epidermal development and epidermal barrier formation. Defects in Cdc42-SPRR signaling may be associated with skin barrier dysfunction and a variety of skin diseases.
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7
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Hu X, Peng N, Qi F, Li J, Shi L, Chen R. Cigarette smoke upregulates SPRR3 by favoring c-Jun/Fra1 heterodimerization in human bronchial epithelial cells. Future Oncol 2018; 14:2599-2613. [PMID: 30073865 DOI: 10.2217/fon-2018-0043] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
AIM The airway epithelium of smokers exhibits upregulated SPRR3, an indicator of pathogenic keratinization. The mechanisms underlying this phenomenon require investigation. PATIENTS & METHODS Human bronchial epithelial (HBE) SPRR3 expression was analyzed by smoking status. Primary HBE cells were exposed to cigarette smoke (CS). SPRR3 expression, SPRR3 promoter activity, AP-1 factor binding and AP-1 factors' effects were analyzed. RESULTS Current smokers display SPRR3 upregulation relative to never smokers. CS upregulates SPRR3 transcription in an exposure-dependent manner. CS promotes c-Jun and Fra1 binding to the SPRR3-AP-1/TRE site. Wild-type c-Jun and Fra1 upregulate, whereas c-Jun and Fra1, dominant-negative mutants, suppress SPRR3 promoter activity. CONCLUSION CS induces SPRR3 upregulation in HBE cells by promoting aberrant c-Jun/Fra1 dimerization.
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Affiliation(s)
- Xiwei Hu
- Department of Respiratory Medicine, The Second Affiliated Hospital of Soochow University, Suzhou City, Jiangsu Province, PR China.,Department of Respiratory Medicine, Affiliated Hospital of Guizhou Medical University, Guiyang City, Guizhou Province, PR China
| | - Nianchun Peng
- Department of Endocrinology, Affiliated Hospital of Guizhou Medical University, Guiyang City, Guizhou Province, PR China
| | - Fei Qi
- Department of Respiratory Medicine, Affiliated Hospital of Guizhou Medical University, Guiyang City, Guizhou Province, PR China
| | - Jingwen Li
- Department of Respiratory Medicine, Affiliated Hospital of Guizhou Medical University, Guiyang City, Guizhou Province, PR China
| | - Lixin Shi
- Department of Respiratory Medicine, The Second Affiliated Hospital of Soochow University, Suzhou City, Jiangsu Province, PR China.,Department of Endocrinology, Affiliated Hospital of Guizhou Medical University, Guiyang City, Guizhou Province, PR China
| | - Rui Chen
- Department of Respiratory Medicine, The Second Affiliated Hospital of Soochow University, Suzhou City, Jiangsu Province, PR China
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8
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Segedy AK, Pyle AL, Li B, Zhang Y, Babaev VR, Jat P, Fazio S, Atkinson JB, Linton MF, Young PP. Identification of small proline-rich repeat protein 3 as a novel atheroprotective factor that promotes adaptive Akt signaling in vascular smooth muscle cells. Arterioscler Thromb Vasc Biol 2014; 34:2527-36. [PMID: 25278290 DOI: 10.1161/atvbaha.114.303644] [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] [Indexed: 01/16/2023]
Abstract
OBJECTIVE Atherosclerosis is the primary driver of cardiovascular disease, the leading cause of death worldwide. Identification of naturally occurring atheroprotective genes has become a major goal for the development of interventions that will limit atheroma progression and associated adverse events. To this end, we have identified small proline-rich repeat protein (SPRR3) as selectively upregulated in vascular smooth muscle cells (VSMCs) of atheroma-bearing arterial tissue versus healthy arterial tissue. In this study, we sought to determine the role of SPRR3 in atheroma pathophysiology. APPROACH AND RESULTS We found that atheroprone apolipoprotein E-null mice lacking SPRR3 developed significantly greater atheroma burden. To determine the cellular driver(s) of this increase, we evaluated SPRR3-dependent changes in bone marrow-derived cells, endothelial cells, and VSMCs. Bone marrow transplant of SPRR3-expressing cells into SPRR3(-/-)apolipoprotein E-deficient recipients failed to rescue atheroma burden. Similarly, endothelial cells did not exhibit a response to SPRR3 loss. However, atheromas from SPRR3-deficient mice exhibited increased TUNEL (terminal deoxynucleotidyl transferase dUTP nick end labeling)-positive VSMCs compared with control. Cell death in SPRR3-deficient VSMCs was significantly increased in vitro. Conversely, SPRR3-overexpressing VSMCs exhibited reduced apoptosis compared with control. We also observed a PI3K (phosphatidylinositol 3-kinase)/Akt-dependent positive association between SPRR3 expression and levels of active Akt in VSMCs. The survival advantage seen in SPRR3-overexpressing VSMCs was abrogated after the addition of a PI3K/Akt pathway inhibitor. CONCLUSIONS These results indicate that SPRR3 protects the lesion from VSMC loss by promoting survival signaling in plaque VSMCs, thereby significantly decreasing atherosclerosis progression. As the first identified atheroma-specific VSMC prosurvival factor, SPRR3 represents a potential target for lesion-specific modulation of VSMC survival.
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Affiliation(s)
- Amanda K Segedy
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.)
| | - Amy L Pyle
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.)
| | - Bin Li
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.)
| | - Youmin Zhang
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.)
| | - Vladimir R Babaev
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.)
| | - Parmjit Jat
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.)
| | - Sergio Fazio
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.)
| | - James B Atkinson
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.)
| | - MacRae F Linton
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.)
| | - Pampee P Young
- From the Department of Pathology, Microbiology, and Immunology (A.K.S., B.L., S.F., J.B.A., P.P.Y.) and Departments of Veterans Affairs Medical Center (J.B.A., P.P.Y.), Pharmacology (M.F.L.), and Medicine (Y.Z., V.R.B., S.F., M.F.L., P.P.Y.), Vanderbilt University Medical Center, Nashville, TN; Department of Neurodegenerative Diseases, Institute of Neurology, University College London, Queen Square, London, United Kingdom (P.J.); Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH (A.L.P.); and Department of Pathology, The Ohio State University, Columbus (A.L.P.).
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9
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Liu Q, Zhang C, Ma G, Zhang Q. Expression of SPRR3 is associated with tumor cell proliferation and invasion in glioblastoma multiforme. Oncol Lett 2013; 7:427-432. [PMID: 24396461 PMCID: PMC3881942 DOI: 10.3892/ol.2013.1736] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Accepted: 11/28/2013] [Indexed: 12/02/2022] Open
Abstract
Esophagin, also known as small proline-rich protein 3 (SPRR3), has been demonstrated to be important in the initiation and progression of numerous types of tumor, including colorectal and breast cancer. However, studies concerning the biological functions of SPRR3 in glioblastoma multiforme (GBM) are limited. Therefore, we aimed to identify the functions and molecular mechanisms underlying the role of SPRR3 in GBM. Hypomethylation of SPRR3 was observed and associated with a poor clinical outcome in GBM patients compared with healthy individuals by using gene methylation profiling. The present study was performed to investigate the expression status and effects of SPRR3 in GBM. The U251 cell line was used in the functional analyses. Cell growth was examined by MTT and colony formation assay. Cell invasion was measured using the Transwell invasion assay. The expression of SPRR3 in tissue samples was examined by immunohistochemistry. The results revealed that the overexpression of SPRR3 accelerates U251 cell proliferation and invasion. It was also observed that SPRR3 was markedly upregulated in 72.7% of GBM samples (24/33) compared with the normal tissue. These results suggest that an increased expression of SPRR3 is involved in tumorigenesis.
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Affiliation(s)
- Qingyang Liu
- Department of Immunology, Institute of Basic Medical Sciences, Capital Medical University, Beijing 100069, P.R. China
| | - Chuanbao Zhang
- Department of Neurosurgery, Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China
| | - Guofo Ma
- Department of Neurosurgery, Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China
| | - Quangeng Zhang
- Department of Immunology, Institute of Basic Medical Sciences, Capital Medical University, Beijing 100069, P.R. China
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10
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Carregaro F, Stefanini ACB, Henrique T, Tajara EH. Study of small proline-rich proteins (SPRRs) in health and disease: a review of the literature. Arch Dermatol Res 2013; 305:857-66. [DOI: 10.1007/s00403-013-1415-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Revised: 09/11/2013] [Accepted: 09/16/2013] [Indexed: 12/26/2022]
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11
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Liu S, Kam WR, Ding J, Hatton MP, Sullivan DA. Effect of growth factors on the proliferation and gene expression of human meibomian gland epithelial cells. Invest Ophthalmol Vis Sci 2013; 54:2541-50. [PMID: 23493293 DOI: 10.1167/iovs.12-11221] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
PURPOSE We hypothesize that growth factors, including epidermal growth factor (EGF) and bovine pituitary extract (BPE), induce proliferation, but not differentiation (e.g., lipid accumulation), of human meibomian gland epithelial cells. We also hypothesize that these actions involve a significant upregulation of genes linked to cell cycle processes, and a significant downregulation of genes associated with differentiation. Our objective was to test these hypotheses. METHODS Immortalized human meibomian gland and conjunctival epithelial cells were cultured for varying time periods in the presence or absence of EGF, BPE, EGF + BPE, or serum, followed by cell counting, neutral lipid staining, or RNA isolation for molecular biological procedures. RESULTS Our studies show that growth factors stimulate a significant, time-dependent proliferation of human meibomian gland epithelial cells. These effects are associated with a significant upregulation of genes linked to cell cycle, DNA replication, ribosomes, and translation, and a significant decrease in those related to cell differentiation, tissue development, lipid metabolic processes, and peroxisome proliferator-activated receptor signaling. Serum-induced differentiation, but not growth factor-related proliferation, elicits a pronounced lipid accumulation in human meibomian gland epithelial cells. This lipogenic response is unique, and is not duplicated by human conjunctival epithelial cells. CONCLUSIONS Our results demonstrate that EGF and BPE stimulate human meibomian gland epithelial cells to proliferate. Further, our findings show that action is associated with an upregulation of cell cycle and translation ontologies, and a downregulation of genetic pathways linked to differentiation and lipid biosynthesis.
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Affiliation(s)
- Shaohui Liu
- Schepens Eye Research Institute, Boston, Massachusetts 02114, USA
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12
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Multiple roles of the epithelium-specific ETS transcription factor, ESE-1, in development and disease. J Transl Med 2012; 92:320-30. [PMID: 22157719 DOI: 10.1038/labinvest.2011.186] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The E26 transformation-specific (ETS) family of transcription factors comprises of 27 and 26 members in humans and mice, respectively, which are known to regulate many different biological processes, including cell proliferation, cell differentiation, embryonic development, neoplasia, hematopoiesis, angiogenesis, and inflammation. The epithelium-specific ETS transcription factor-1 (ESE-1) is a physiologically important ETS transcription factor, which has been shown to play a role in the pathogenesis of various diseases, and was originally characterized as having an epithelial-restricted expression pattern, thus placing it within the epithelium-specific ETS subfamily. Despite a large body of published work on ETS biology, much remains to be learned about the precise functions of ESE-1 and other epithelium-specific ETS factors in regulating diverse disease processes. Clues as to the specific function of ESE-1 in the setting of various diseases can be obtained from studies aimed at examining the expression of putative target genes regulated by ESE-1. Thus, this review will focus primarily on the various roles of ESE-1 in different pathophysiological processes, including regulation of epithelial cell differentiation during both intestinal development and lung regeneration; regulation of dendritic cell-driven T-cell differentiation during allergic airway inflammation; regulation of mammary gland development and breast cancer; and regulation of the effects of inflammatory stimuli within the setting of synovial joint and vascular inflammation. Understanding the exact mechanisms by which ESE-1 regulates these processes can have important implications for the treatment of a wide range of diseases.
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13
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de A Simão T, Souza-Santos PT, de Oliveira DSL, Bernardo V, Lima SCS, Rapozo DCM, Kruel CDP, Faria PA, Ribeiro Pinto LF, Albano RM. Quantitative evaluation of SPRR3 expression in esophageal squamous cell carcinoma by qPCR and its potential use as a biomarker. Exp Mol Pathol 2011; 91:584-9. [PMID: 21777580 DOI: 10.1016/j.yexmp.2011.06.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2011] [Revised: 06/24/2011] [Accepted: 06/24/2011] [Indexed: 12/24/2022]
Abstract
Esophageal squamous cell carcinoma (ESCC) is highly fatal due to late diagnosis and inefficient treatment. Early disease detection could improve diagnosis and patient survival. Esophageal squamous epithelial cells express SPRR3, a member of the small proline-rich protein family, which is downregulated in ESCC. Therefore, SPRR3 expression may be used as a biomarker to follow the transition from healthy mucosa to ESCC. Both SPRR3 mRNA splice variants, v1 and v2, were evaluated by real time PCR in tumor and histologically normal adjacent tissue biopsies from 84 ESCC patients and 18 healthy controls. SPRR3-v1 was most highly expressed in the esophageal mucosa of healthy subjects, with an increasingly lower expression in the adjacent mucosa of ESCC patients and in tumors, respectively. SPRR3-v2 expression was low in normal mucosa and in tumors but it was higher in the adjacent mucosa of ESCC patients. In addition, we found a significant correlation between a lower SPRR3-v1 and SPRR3-v2 expression and age and alcohol consumption, respectively. SPRR3 protein expression presented a good correlation with SPRR3 mRNA expression. Cut-off points to discriminate between healthy mucosa, tumor and adjacent mucosa were determined with receiver operating characteristic (ROC) curves. This analysis showed that SPRR3-v1 expression discriminates the esophageal mucosa of healthy subjects from the adjacent mucosa and the tumor of ESCC patients with high sensitivity and specificity. Our data shows that the quantitative analysis of SPRR3 mRNA is a robust and reliable method to monitor the malignant transformation of the healthy esophageal mucosa into ESCC.
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Affiliation(s)
- Tatiana de A Simão
- Departamento de Bioquímica, Universidade do Estado do Rio de Janeiro, Instituto de Biologia Roberto Alcantara Gomes, Rio de Janeiro, Brazil
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14
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Liu S, Richards SM, Lo K, Hatton M, Fay A, Sullivan DA. Changes in gene expression in human meibomian gland dysfunction. Invest Ophthalmol Vis Sci 2011; 52:2727-40. [PMID: 21372006 PMCID: PMC3088560 DOI: 10.1167/iovs.10-6482] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Revised: 12/15/2010] [Accepted: 03/01/2011] [Indexed: 12/14/2022] Open
Abstract
PURPOSE Meibomian gland dysfunction (MGD) may be the leading cause of dry eye syndrome throughout the world. However, the precise mechanism(s) underlying the pathogenesis of this disease is unclear. This study was conducted to identify meibomian gland genes that may promote the development and/or progression of human MGD. METHODS Lid tissues were obtained from male and female MGD patients and age-matched controls after eyelid surgeries (e.g., to correct entropion or ectropion). Meibomian glands were isolated and processed for RNA extraction and the analysis of gene expression. RESULTS The results show that MGD is associated with significant alterations in the expression of almost 400 genes in the human meibomian gland. The levels of 197 transcripts, including those encoding various small proline-rich proteins and S100 calcium-binding proteins, are significantly increased, whereas the expression of 194 genes, such as claudin 3 and cell adhesion molecule 1, is significantly decreased. These changes, which cannot be accounted for by sex differences, are accompanied by alterations in many gene ontologies (e.g., keratinization, cell cycle, and DNA repair). The findings also show that the human meibomian gland contains several highly expressed genes that are distinct from those in an adjacent tissue (i.e., conjunctival epithelium). CONCLUSIONS The results demonstrate that MGD is accompanied by multiple changes in gene expression in the meibomian gland. The nature of these alterations, including the upregulation of genes encoding small proline-rich proteins and S100 calcium-binding proteins, suggest that keratinization plays an important role in the pathogenesis of MGD.
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Affiliation(s)
- Shaohui Liu
- From the Schepens Eye Research Institute
- the Department of Ophthalmology, and
| | - Stephen M. Richards
- From the Schepens Eye Research Institute
- the Department of Ophthalmology, and
| | - Kristine Lo
- the Department of Ophthalmology, and
- the Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts; and
| | - Mark Hatton
- From the Schepens Eye Research Institute
- the Department of Ophthalmology, and
- Ophthalmic Consultants of Boston, Boston, Massachusetts
| | - Aaron Fay
- the Department of Ophthalmology, and
- the Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts; and
| | - David A. Sullivan
- From the Schepens Eye Research Institute
- the Department of Ophthalmology, and
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15
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Manconi B, Cabras T, Pisano E, Nemolato S, Inzitari R, Iavarone F, Fanali C, Sanna MT, Tirone C, Vento G, Romagnoli C, Faa G, Castagnola M, Messana I. Characterization of two isoforms of human SPRR3 from saliva of preterm human newborn and autoptic fetal oral mucosa, parotid and submandibular gland samples. Biochem Biophys Res Commun 2010; 398:477-81. [DOI: 10.1016/j.bbrc.2010.06.103] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2010] [Accepted: 06/26/2010] [Indexed: 11/26/2022]
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16
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Pyle AL, Atkinson JB, Pozzi A, Reese J, Eckes B, Davidson JM, Crimmins DL, Young PP. Regulation of the atheroma-enriched protein, SPRR3, in vascular smooth muscle cells through cyclic strain is dependent on integrin alpha1beta1/collagen interaction. THE AMERICAN JOURNAL OF PATHOLOGY 2008; 173:1577-88. [PMID: 18832573 DOI: 10.2353/ajpath.2008.080042] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Atherosclerotic plaques express high levels of small proline-rich repeat protein (SPRR3), a previously characterized component of the cornified cell envelope of stratified epithelia, where it is believed to play a role in cellular adaptation to biomechanical stress. We investigated the physiological signals and underlying mechanism(s) that regulate atheroma-enriched SPRR3 expression in vascular smooth muscle cells (VSMCs). We showed that SPRR3 is expressed by VSMCs in both human and mouse atheromas. In cultured arterial VSMCs, mechanical cyclic strain, but neither shear stress nor lipid loading induced SPRR3 expression. Furthermore, this upregulation of SPRR3 expression was dependent on VSMC adherence to type I collagen. To link the mechanoregulation of SPRR3 to specific collagen/integrin interactions, we used blocking antibodies against either integrin alpha1 or alpha2 subunits and VSMCs from mice that lack specific collagen receptors. Our results showed a dependence on the alpha1beta1 integrin for SPRR3 expression induced by cyclic strain. Furthermore, we showed that integrin alpha1 but not alpha2 subunits were expressed on VSMCs within mouse lesions but not in normal arteries. Therefore, we identified the enrichment of the mechanical strain-regulated protein SPRR3 in VSMCs of both human and mouse atherosclerotic lesions whose expression is dependent on the collagen-binding integrin alpha1beta1 on VSMCs. These data suggest that SPRR3 may play a role in VSMC adaptation to local biomechanical stress within the plaque microenvironment.
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Affiliation(s)
- Amy L Pyle
- Vanderbilt University Medical Center, Department of Pathology, Nashville, TN 37232, USA
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17
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Iwai S, Amekawa S, Yomogida K, Sumi T, Nakazawa M, Yura Y, Nishimune Y, Nozaki M. ESE-1 inhibits the invasion of oral squamous cell carcinoma in conjunction with MMP-9 suppression. Oral Dis 2008; 14:144-9. [PMID: 18302674 DOI: 10.1111/j.1601-0825.2007.01360.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES Matrix metalloproteinases (MMPs) regulated by ets transcription factors facilitate carcinoma cell invasion. An ets family member, ESE-1, is expressed specifically in epithelial tissues, but its association with MMPs is obscure. In this study, we investigated whether ESE-1 regulates invasion of oral squamous cell carcinoma (SCC) via transcriptional activity of MMP-9. METHODS HSC-3 and KB were used as human oral SCC lines. The expression of ESE-1 and MMP-9 was detected by in situ hybridization and immunohistochemistry. Invasion assay, gelatin zymography and Northern blotting were used to detect the invasion activity, the gelatinolytic activity and the expression of MMP-9 in the ESE-1 transfectants. Luciferase assays and mutation analysis were used for the transcriptional analysis of MMP-9 promoter region by ESE-1. RESULTS ESE-1 was expressed in the intermediate layer but not in the invasive area, in which MMP-9 was expressed, in the oral SCC tissues. ESE-1 suppressed invasion activity and 92 kDa gelatinolytic activity in HSC-3 as a result of transfection. ESE-1 regulates MMP-9 expression in a negative manner and the ets binding site on the MMP-9 promoter contributed to suppression by ESE-1. CONCLUSIONS These findings indicate that ESE-1 negatively regulates the invasion of oral SCC via transcriptional suppression of MMP-9.
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Affiliation(s)
- S Iwai
- Department of Oral and Maxillofacial Surgery II, Faculty of Dentistry, Osaka University, Osaka, Japan
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18
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Zhang Y, Feng YB, Shen XM, Chen BS, Du XL, Luo ML, Cai Y, Han YL, Xu X, Zhan QM, Wang MR. Exogenous expression of Esophagin/SPRR3 attenuates the tumorigenicity of esophageal squamous cell carcinoma cellsviapromoting apoptosis. Int J Cancer 2007; 122:260-6. [DOI: 10.1002/ijc.23104] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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19
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Fischer DF, Backendorf C. Identification of regulatory elements by gene family footprinting and in vivo analysis. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2007; 104:37-64. [PMID: 17290818 DOI: 10.1007/10_027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Gene families of recently duplicated but subsequently diverged genes provide an unique opportunity for comparative analysis of regulatory elements. We have studied the human SPRR gene family of small proline rich proteins involved in barrier function of stratified squamous epithelia. These genes are all expressed in normal human keratinocytes, but respond differently to environmental insults. Comparisons of the functional promoter regions allows the rapid identification of both conserved and of novel regulatory elements that appeared after gene duplication. Competitive electrophoretic mobility shift assays can be used to confirm their presence. Here we show the power of gene family footprinting by the identification of two novel elements in the SPRR3 promoter, not present in SPRR1A and SPRR2A. One of these elements binds a protein similar to GAAP-1, a pro-apoptotic activator of IRF-1 and p53. In vivo analysis shows that this element functions as an inhibitor of SPRR3 transcription. The second novel element functions as an activator of promoter activity and is characterized by its A/T rich sequence. The latter interacting protein indeed binds through contacts in the minor groove, and strikingly, depends on the presence of calcium for DNA interaction.
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Affiliation(s)
- David F Fischer
- Laboratory of Molecular Genetics, Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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20
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Yu X, Luo A, Zhou C, Ding F, Wu M, Zhan Q, Liu Z. Differentiation-associated genes regulated by TPA-induced c-Jun expression via a PKC/JNK pathway in KYSE450 cells. Biochem Biophys Res Commun 2006; 342:286-92. [PMID: 16480952 DOI: 10.1016/j.bbrc.2006.01.147] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2006] [Accepted: 01/29/2006] [Indexed: 11/21/2022]
Abstract
A group of potential differentiation-associated genes had been identified by microarray analysis as c-Jun/AP-1 target genes essential for epithelial differentiation program. Our previous study showed that c-Jun/AP-1 could bind and activate these gene promoters in vivo using chromatin immunoprecipitation. To further understand how the mitogen-activated protein kinase signaling pathways regulate AP-1 activity and expression of c-Jun target genes, our strategy was based on the use of 12-o-tetradecanoylophorbol-13-acetate (TPA) and pharmacological reagents to induce or block c-Jun expression. The mRNA and protein expression of these genes increased in response to TPA-induced c-Jun/AP-1 expression. Inhibitors of JNK (SP600125) and PKC (GF109203X) mainly blocked expression and phosphorylation of c-Jun, while inhibition of MEK-ERK activity with PD98059 (an inhibitor of MEK) had little effect. Expression of involucrin and keratin 4 in response to TPA was attenuated by pretreatments with GF109203X and SP600125, but not PD98059, suggesting involvement of PKC and JNK in this response. Taken together, these results suggested that differentiation-associated genes were regulated by TPA-induced c-Jun/AP-1 mainly via a PKC/JNK pathway in esophageal cancer cell line KYSE450.
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Affiliation(s)
- Xinfeng Yu
- National Laboratory of Molecular Oncology, Cancer Institute, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, PR China
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Jackson B, Tilli CMLJ, Hardman MJ, Avilion AA, MacLeod MC, Ashcroft GS, Byrne C. Late cornified envelope family in differentiating epithelia--response to calcium and ultraviolet irradiation. J Invest Dermatol 2005; 124:1062-70. [PMID: 15854049 DOI: 10.1111/j.0022-202x.2005.23699.x] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The late cornified envelope (LCE) gene cluster within the epidermal differentiation complex on human chromosome one (mouse chromosome three) contains multiple conserved genes encoding stratum-corneum proteins. Within the LCE cluster, genes form "groups" based on chromosomal position and protein homology. We link a recently accepted nomenclature for the LCE cluster (formerly XP5, small proline-rich-like, late-envelope protein genes) to gene structure, groupings, and chromosomal organization, and carry out a pan-cluster quantitative expression analysis in a variety of tissues and environmental conditions. This analysis shows that (i) the cluster organizes into two "skin" expressing groups and a third group with low-level, tissue-specific expression patterns in all barrier-forming epithelia tested, including internal epithelia; (ii) LCE genes respond "group-wise" to environmental stimuli such as calcium levels and ultraviolet (UV) light, highlighting the functional significance of groups; (iii) in response to UV stimulation there is massive upregulation of a single, normally quiescent, non-skin LCE gene; and (iv) heterogeneity occurs between individuals with one individual lacking expression of an LCE skin gene without overt skin disease, suggesting LCE genes affect subtle attributes of skin function. This quantitative and pan-cluster expression analysis suggests that LCE groups have distinct functions and that within groups regulatory diversification permits specific responsiveness to environmental challenge.
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Affiliation(s)
- Benjamin Jackson
- Faculty of Life Sciences, University of Manchester, Manchester, UK
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22
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Schmuth M, Elias PM, Hanley K, Lau P, Moser A, Willson TM, Bikle DD, Feingold KR. The Effect of LXR Activators on AP-1 Proteins in Keratinocytes. J Invest Dermatol 2004; 123:41-8. [PMID: 15191540 DOI: 10.1111/j.0022-202x.2004.22707.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Oxysterols, via activation of liver X receptor (LXR), regulate keratinocyte differentiation by stimulating transglutaminase cross-linking of several constituent proteins leading to the formation of the cornified envelope. We previously reported that oxysterols increase the expression of one of these cross-linked proteins, involucrin, and that this effect can be abolished by mutations of the distal activator protein (AP)-1 response element in the involucrin promoter. Furthermore, oxysterols increase AP-1 binding in an electrophoretic gel mobility shift assay and increase the expression of an AP-1 reporter. In this study, we describe the individual components of the AP-1 complex that are involved in the oxysterol-mediated AP-1 activation and stimulation of keratinocyte differentiation. We identified Fra-1 within the AP-1 DNA binding complex by supershift analysis of nuclear extracts from oxysterol-treated, cultured keratinocytes and confirmed that oxysterol treatment increased the levels of Fra-1 by western blot analysis. Additionally, on Western and Northern analysis, oxysterol treatment increased two other AP-1 proteins, Jun-D and c-Fos, whereas Fra-2, Jun-B, and c-Jun were not changed. Similar alterations in AP-1 proteins occurred when 25-OH-cholesterol or non-steroidal LXR agonists (GW3965, TO-901317) were used. These results indicate that oxysterols induce specific AP-1 proteins, thereby activating involucrin, one of the genes required for epidermal differentiation.
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Affiliation(s)
- Matthias Schmuth
- Department of Medicine, University of California, San Francisco, California, USA
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23
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Luo A, Kong J, Hu G, Liew CC, Xiong M, Wang X, Ji J, Wang T, Zhi H, Wu M, Liu Z. Discovery of Ca2+-relevant and differentiation-associated genes downregulated in esophageal squamous cell carcinoma using cDNA microarray. Oncogene 2004; 23:1291-9. [PMID: 14647409 DOI: 10.1038/sj.onc.1207218] [Citation(s) in RCA: 159] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
To identify genes that are differentially expressed in human esophageal squamous cell carcinoma (ESCC), we have developed a cDNA microarray representing 34 176 clones to analyse gene expression profiles in ESCC. A total of 77 genes (including 31 novel genes) were downregulated, and 15 genes (including one novel gene) were upregulated in cancer tissues compared with their normal counterparts. Immunohistochemistry and Northern blot analysis were carried out to verify the cDNA microarray results. It was revealed that genes involved in squamous cell differentiation were coordinately downregulated, including annexin I, small proline-rich proteins (SPRRs), calcium-binding S100 proteins (S100A8, S100A9), transglutaminase (TGM3), cytokeratins (KRT4, KRT13), gut-enriched Krupple-like factor (GKLF) and cystatin A. Interestingly, most of the downregulated genes encoded Ca(2+)-binding or -modulating proteins that constitute the cell envelope (CE). Moreover, genes associated with invasion or proliferation were upregulated, including genes such as fibronectin, secreted protein acidic and rich in cystein (SPARC), cathepsin B and KRT17. Functional analysis of the alteration in the expression of GKLF suggested that GKLF might be able to regulate the expression of SPRR1A, SPRR2A and KRT4 in ESCC. This study provides new insights into the role of squamous cell differentiation-associated genes in ESCC initiation and progression.
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Affiliation(s)
- Aiping Luo
- National Lab of Molecular Oncology, Cancer Institute, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100021, P.R. China
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Matsuzaki Y, Tamai K, Kon A, Sawamura D, Uitto J, Hashimoto I. Keratinocyte responsive element 3: analysis of a keratinocyte-specific regulatory sequence in the 230-kDa bullous pemphigoid antigen gene promoter. J Invest Dermatol 2003; 120:308-12. [PMID: 12542537 DOI: 10.1046/j.1523-1747.2003.12044.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The 230-kDa bullous pemphigoid antigen gene is expressed primarily, if not exclusively, in basal keratinocytes of the epidermis. Keratinocyte responsive element 3, a cis-element at position -216 to -197 of the human 230-kDa bullous pemphigoid antigen gene promoter, confers tissue-specific expression to this gene (Tamai et al: J Biol Chem 270:7609-7614, 1995). In this study, we investigated the functional characteristics of keratinocyte responsive element 3 on the 230-kDa bullous pemphigoid antigen gene core promoter by transient transfections of cultured normal human keratinocytes and normal human fibroblasts, as well as of lung carcinoma (A549), osteosarcoma (OST), and gastric adenocarcinoma (GT3TKB) cell lines. A 230-kDa bullous pemphigoid antigen gene core promoter/luciferase reporter gene plasmid construct, pBPL, was modified to develop a series of constructs (pKBPL-p4KBPL), which have insertions of one, two, three, or four tandem repeats of keratinocyte responsive element 3, and these plasmids were used in transient transfections of the cultured cells. The promoter activities of pKBPL-p4KBPL constructs, relative to pBPL, in normal human keratinocytes were 7.6-, 15.5-, 4.6-, and 2.7-fold higher, respectively, whereas no upregulatory effect by keratinocyte responsive element 3 insertion was observed in other cell lines tested. prKBPL, a plasmid constructed with keratinocyte responsive element 3 in reverse orientation, showed essentially no activity in normal human keratinocytes. Insertion of a random 20 bp sequence between keratinocyte responsive element 3 and the 230-kDa bullous pemphigoid antigen gene core promoter resulted in about 40% reduction of luciferase activity in normal human keratinocytes. These data suggest that keratinocyte responsive element 3 functions as a position-, copy number-, and orientation-dependent cis-element contributing to tissue-specific regulation of the 230-kDa bullous pemphigoid antigen gene.
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Affiliation(s)
- Yasushi Matsuzaki
- Department of Dermatology, Hirosaki University School of Medicine, Hirosaki, Japan.
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25
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Smolinski KN, Abraham JM, Souza RF, Yin J, Wang S, Xu Y, Zou TT, Kong D, Fleisher AS, Meltzer SJ. Activation of the esophagin promoter during esophageal epithelial cell differentiation. Genomics 2002; 79:875-80. [PMID: 12036303 DOI: 10.1006/geno.2002.6775] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Esophagin is a member of the small proline-rich protein family of cell envelope precursor proteins, which are expressed during squamous cell differentiation. Esophagin is expressed at high levels in normal esophageal epithelium, but its expression is absent from esophageal squamous cell carcinomas and adenocarcinomas. Moreover, loss of esophagin expression is present in areas of dysplasia or normal mucosa adjacent to carcinomas, suggesting that absence of esophagin may constitute a harbinger of early esophageal malignant transformation. A greater understanding of transcriptional control of esophagin may provide valuable insights into esophageal malignancy. Therefore, this study was undertaken in order to isolate and carry out initial characterization of a functional promoter for esophagin. A genomic clone containing esophagin was isolated and sequenced, including 2.7 kb of the esophagin promoter region. Esophagin expression was studied in response to various treatments of primary cultured human esophageal epithelial cells and squamous cell carcinoma cell lines. Calcium was the strongest inducer of the endogenous esophagin promoter, with induction occurring at 12-72 hours. In primary cultured esophageal epithelial cells, a region spanning 116 bp upstream of the transcriptional start site to 45 bp downstream was sufficient to direct low, basal, in vitro esophagin expression. However, responsiveness of primary esophageal cells to calcium required inclusion of promoter elements 1688 bp upstream of the transcriptional start site. Site-directed mutagenesis studies suggested a putative role for C/EBP-beta, OCT-1, and OCT-3 transcription factor binding sites in the minimal promoter region. In conjunction with published human in vivo studies, these data support the hypothesis that esophagin is a biomarker of esophageal squamous cell differentiation and provide an in vitro model to evaluate regulatory factors involved in this differentiation process.
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Affiliation(s)
- Kara N Smolinski
- Department of Medicine, Gastroenterology Division and Greenebaum Cancer Center, University of Maryland School of Medicine, 22 S. Greene Street, Baltimore, MD 21201, USA
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26
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Tugores A, Le J, Sorokina I, Snijders AJ, Duyao M, Reddy PS, Carlee L, Ronshaugen M, Mushegian A, Watanaskul T, Chu S, Buckler A, Emtage S, McCormick MK. The epithelium-specific ETS protein EHF/ESE-3 is a context-dependent transcriptional repressor downstream of MAPK signaling cascades. J Biol Chem 2001; 276:20397-406. [PMID: 11259407 DOI: 10.1074/jbc.m010930200] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Exon trapping and cDNA selection procedures were used to search for novel genes at human chromosome 11p13, a region previously associated with loss of heterozygosity in epithelial carcinomas. Using these approaches, we found the ESE-2 and ESE-3 genes, coding for ETS domain-containing transcription factors. These genes lie in close proximity to the catalase gene within a approximately 200-kilobase genomic interval. ESE-3 mRNA is widely expressed in human tissues with high epithelial content, and immunohistochemical analysis with a newly generated monoclonal antibody revealed that ESE-3 is a nuclear protein expressed exclusively in differentiated epithelial cells and that it is absent in the epithelial carcinomas tested. In transient transfections, ESE-3 behaves as a repressor of the Ras- or phorbol ester-induced transcriptional activation of a subset of promoters that contain ETS and AP-1 binding sites. ESE-3-mediated repression is sequence- and context-dependent and depends both on the presence of high affinity ESE-3 binding sites in combination with AP-1 cis-elements and the arrangement of these sites within a given promoter. We propose that ESE-3 might be an important determinant in the control of epithelial differentiation, as a modulator of the nuclear response to mitogen-activated protein kinase signaling cascades.
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Affiliation(s)
- A Tugores
- Axys Pharmaceuticals, Inc., South San Francisco, CA 94080, USA.
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27
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Cabral A, Voskamp P, Cleton-Jansen AM, South A, Nizetic D, Backendorf C. Structural organization and regulation of the small proline-rich family of cornified envelope precursors suggest a role in adaptive barrier function. J Biol Chem 2001; 276:19231-7. [PMID: 11279051 DOI: 10.1074/jbc.m100336200] [Citation(s) in RCA: 124] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The protective barrier provided by stratified squamous epithelia relies on the cornified cell envelope (CE), a structure synthesized at late stages of keratinocyte differentiation. It is composed of structural proteins, including involucrin, loricrin, and the small proline-rich (SPRR) proteins, all encoded by genes localized at human chromosome 1q21. The genetic characterization of the SPRR locus reveals that the various members of this multigene family can be classified into two distinct groups with separate evolutionary histories. Whereas group 1 genes have diverged in protein structure and are composed of three different classes (SPRR1 (2x), SPRR3, and SPRR4), an active process of gene conversion has counteracted diversification of the protein sequences of group 2 genes (SPRR2 class, seven genes). Contrasting with this homogenization process, all individual members of the SPRR gene family show specific in vivo and in vitro expression patterns and react selectively to UV irradiation. Apparently, creation of regulatory rather than structural diversity has been the driving force behind the evolution of the SPRR gene family. Differential regulation of highly homologous genes underlines the importance of SPRR protein dosage in providing optimal barrier function to different epithelia, while allowing adaptation to diverse external insults.
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Affiliation(s)
- A Cabral
- Department of Molecular Genetics, Leiden Institute of Chemistry, P. O. Box 9502, 2300 RA Leiden, The Netherlands
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Angel P, Szabowski A, Schorpp-Kistner M. Function and regulation of AP-1 subunits in skin physiology and pathology. Oncogene 2001; 20:2413-23. [PMID: 11402337 DOI: 10.1038/sj.onc.1204380] [Citation(s) in RCA: 315] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The mouse skin has become the model of choice to study the regulation and function of AP-1 subunits in many physiological and pathological processes in vivo and in vitro. Genetically modified mice, in vitro reconstituted skin equivalents and epidermal cell lines were established, in which AP-1-regulated genetic programs of cell proliferation, differentiation and tumorigenesis can be analysed. Since the epidermis, as our interface with the environment, is subjected to radiation and injury, signal transduction pathways and critical AP-1 members regulating the mammalian stress response could be identified. Regulated expression of important components of the cytokine network, cell surface receptors and proteases, which orchestrate the process of wound healing has been found to rely on AP-1 activity. Here we review our current knowledge on the function of AP-1 subunits and AP-1 target genes in these fascinating fields of skin physiology and pathology.
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Affiliation(s)
- P Angel
- Deutsches Krebsforschungszentrum, Division of Signal Transduction and Growth Control, Im Neuenheimer Feld 280, 69120, Heidelberg, Germany
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29
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Marenholz I, Zirra M, Fischer DF, Backendorf C, Ziegler A, Mischke D. Identification of human epidermal differentiation complex (EDC)-encoded genes by subtractive hybridization of entire YACs to a gridded keratinocyte cDNA library. Genome Res 2001; 11:341-55. [PMID: 11230159 PMCID: PMC311024 DOI: 10.1101/gr.114801] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The epidermal differentiation complex (EDC) comprises a large number of genes that are of crucial importance for the maturation of the human epidermis. So far, 27 genes of 3 related families encoding structural as well as regulatory proteins have been mapped within a 2-Mb region on chromosome 1q21. Here we report on the identification of 10 additional EDC genes by a powerful subtractive hybridization method using entire YACs (950_e_2 and 986_e_10) to screen a gridded human keratinocyte cDNA library. Localization of the detected cDNA clones has been established on a long-range restriction map covering more than 5 Mb of this genomic region. The genes encode cytoskeletal tropomyosin TM30nm (TPM3), HS1-binding protein Hax-1 (HAX1), RNA-specific adenosine deaminase (ADAR1), the 34/67-kD laminin receptor (LAMRL6), and the 26S proteasome subunit p31 (PSMD8L), as well as five hitherto uncharacterized proteins (NICE-1, NICE-2, NICE-3, NICE-4, and NICE-5). The nucleotide sequences and putative ORFs of the EDC genes identified here revealed no homology with any of the established EDC gene families. Whereas database searches revealed that NICE-3, NICE-4, and NICE-5 were expressed in many tissues, no EST or gene-specific sequence was found for NICE-2. Expression of NICE-1 was up-regulated in differentiated keratinocytes, pointing to its relevance for the terminal differentiation of the epidermis. The newly identified EDC genes are likely to provide further insights into epidermal differentiation and they are potential candidates to be involved in skin diseases and carcinogenesis that are associated with this region of chromosome 1. Moreover, the extended integrated map of the EDC, including the polymorphic sequence tag site (STS) markers D1S1664, D1S2346, and D1S305, will serve as a valuable tool for linkage analyses.
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Affiliation(s)
- I Marenholz
- Institut für Immungenetik, Universitätsklinikum Charité der Humboldt-Universität zu Berlin, 14050 Berlin, Germany
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Patterson T, Vuong H, Liaw YS, Wu R, Kalvakolanu DV, Reddy SP. Mechanism of repression of squamous differentiation marker, SPRR1B, in malignant bronchial epithelial cells: role of critical TRE-sites and its transacting factors. Oncogene 2001; 20:634-44. [PMID: 11313996 DOI: 10.1038/sj.onc.1204134] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2000] [Revised: 11/16/2000] [Accepted: 11/27/2000] [Indexed: 11/09/2022]
Abstract
The overexpression of SPRR1B in bronchial epithelium is a marker for early metaplastic changes and the loss of its expression is associated with an irreversible malignant transformation. In the present study, we have used a model system consisting of normal and malignant bronchial epithelial (BE) cells to elucidate the differential transcriptional control of SPRR1B. SPRR1B expression is either detectable or PMA (phorbol 13-myristate 12-acetate) -inducible in several malignant BE cells including squamous, adeno, small and large cell carcinomas. Loss of SPRR1B expression is correlated well with the lack of strong in vivo protein-DNA interactions at the -152 bp promoter, which contains two functional TRE sites. Even though the basal level AP-1 protein DNA binding pattern is different between normal and malignant cells, PMA significantly enhances Jun and Fos binding to the consensus TRE site in both cell types. Intriguingly, the composition of AP-1 protein binding to the -152 to -86 bp SPRR1B promoter is quite different. In untreated cells, SPRR1B promoter is predominantly occupied by JunD and Fra2. PMA significantly induced binding of JunB and Fra1 in normal cells, while JunB and Fra2 bound to TREs in the malignant cells. Overexpression of fra1 in malignant cells significantly enhanced SPRR1B promoter activity. In contrast, overexpression of fra2, but not fra1, strongly reduced both basal and PMA-inducible promoter activities in normal cells. Together, these results indicate that either temporal expression and/or differential activation of AP-1 proteins, especially Fra1 and Fra2, might contribute to the dysregulation of terminal differentiation marker, SPRR1B, expression in various BE cells.
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Affiliation(s)
- T Patterson
- The Johns Hopkins University School of Public Health, Department of Environmental Health Sciences, 615 North Wolfe Street, Baltimore, MD 21205, USA
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31
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De Heller-Milev M, Huber M, Panizzon R, Hohl D. Expression of small proline rich proteins in neoplastic and inflammatory skin diseases. Br J Dermatol 2000; 143:733-40. [PMID: 11069449 DOI: 10.1046/j.1365-2133.2000.03768.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND The formation of the cornified cell envelope (CE) during the late stages of epidermal differentiation is essential for epidermal barrier function and protects the body against environmental attack and water loss. Formation of the CE involves the replacement of the plasma membrane by cross-linkage of precursor proteins such as involucrin, small proline rich proteins (SPRR) and loricrin. In normal epidermis, SPRR1 is restricted to appendages, SPRR2 is also expressed in interfollicular areas, while SPRR3 is completely absent; the latter is most abundant in oral epithelium. This differential expression indicates an important part for SPRRs in specific barrier requirements, and reflects their importance in the biomechanical properties of the CE. OBJECTIVES We report here on the expression of SPRR1, SPRR2 and SPRR3 in a wide range of cutaneous neoplastic and inflammatory diseases. METHODS We used immunohistochemistry; in addition, Northern blot analysis of malignant tumours was performed. RESULTS Increased suprabasal expression of SPRR1 and SPRR2, but no SPRR3 expression, was noted in inflammatory dermatoses with orthokeratotic and parakeratotic squamous differentiation. By contrast, differentiating epidermal tumours such as Bowen's disease, keratoacanthoma and squamous cell carcinoma expressed SPRR3. CONCLUSIONS As SPRRs were originally cloned on the basis of their expression in ultraviolet light-irradiated keratinocytes, the expression of SPRR3 in actinic lesions is of interest, and might serve as a diagnostic tool.
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Affiliation(s)
- M De Heller-Milev
- Department of Dermatology, CHUV/DHURDV, CH-1011 Lausanne, Switzerland
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Kas K, Finger E, Grall F, Gu X, Akbarali Y, Boltax J, Weiss A, Oettgen P, Kapeller R, Libermann TA. ESE-3, a novel member of an epithelium-specific ets transcription factor subfamily, demonstrates different target gene specificity from ESE-1. J Biol Chem 2000; 275:2986-98. [PMID: 10644770 DOI: 10.1074/jbc.275.4.2986] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Most cancers originate as a result of aberrant gene expression in mainly glandular epithelial tissues leading to defects in epithelial cell differentiation. The latter is governed by distinct sets of transcriptional regulators. Here we report the characterization of epithelium-specific Ets factor, family member 3 (ESE-3), a novel member of the ESE subfamily of Ets transcription factors. ESE-3 shows highest homology to two other epithelium restricted Ets factors, ESE-1 and ESE-2. ESE-3, like ESE-1 and ESE-2, is exclusively expressed in a subset of epithelial cells with highest expression in glandular epithelium such as prostate, pancreas, salivary gland, and trachea. A potential role in branching morphogenesis is suggested, since ESE-3 transactivates the c-MET promoter via three high affinity binding sites. Additionally, ESE-3 binding to DNA sequences in the promoters of several glandular epithelium-specific genes suggests a role for ESE-3 in later stages of glandular epithelium differentiation. Although ESE-3 and ESE-1 bind with similar affinity to various Ets binding sites, ESE-3 and ESE-1 differ significantly in their ability to transactivate the promoters containing these sites. Our results support the notion that ESE-1, ESE-2, and ESE-3 represent a unique epithelium-specific subfamily of Ets factors that have critical but distinct functions in epithelial cell differentiation and proliferation.
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Affiliation(s)
- K Kas
- New England Baptist Bone and Joint Institute, Beth Israel Deaconess Medical Center, and Harvard Medical School, Boston, Massachusetts 02115, USA
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33
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Oettgen P, Kas K, Dube A, Gu X, Grall F, Thamrongsak U, Akbarali Y, Finger E, Boltax J, Endress G, Munger K, Kunsch C, Libermann TA. Characterization of ESE-2, a novel ESE-1-related Ets transcription factor that is restricted to glandular epithelium and differentiated keratinocytes. J Biol Chem 1999; 274:29439-52. [PMID: 10506207 DOI: 10.1074/jbc.274.41.29439] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Epithelial cell differentiation is tightly controlled by distinct sets of transcription factors that regulate the expression of stage-specific genes. We recently isolated the first epithelium-specific Ets transcription factor (ESE-1). Here we describe the characterization of ESE-2, a second epithelium-restricted ESE-1-related Ets factor. Like ESE-1, ESE-2 is induced during keratinocyte differentiation. However, whereas ESE-1 is expressed in the majority of epithelial cell types, ESE-2 expression is restricted to differentiated keratinocytes and glandular epithelium such as salivary gland, prostate, mammary gland, and kidney. In contrast to ESE-1, full-length ESE-2 binds poorly to DNA due to the presence of a negative regulatory domain at the amino terminus. Furthermore, although ESE-1 and the amino-terminally deleted ESE-2 bind with similar affinity to the canonical E74 Ets site, ESE-2 and ESE-1 differ strikingly in their relative affinity toward binding sites in the c-MET and PSMA promoters. Similarly, ESE-1 and ESE-2 drastically differ in their ability to transactivate epithelium-specific promoters. Thus, ESE-2, but not ESE-1, transactivates the parotid gland-specific PSP promoter and the prostate-specific PSA promoter. In contrast, ESE-1 transactivates the keratinocyte-specific SPRR2A promoter Ets site and the prostate-specific PSMA promoter significantly better than ESE-2. Our results demonstrate the existence of a unique class of related epithelium-specific Ets factors with distinct functions in epithelial cell gene regulation.
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Affiliation(s)
- P Oettgen
- New England Baptist Bone and Joint Institute, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02115, USA
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