1
|
Kokolakis G, Sabat R, Krüger-Krasagakis S, Eberle J. Ambivalent Effects of Tumor Necrosis Factor Alpha on Apoptosis of Malignant and Normal Human Keratinocytes. Skin Pharmacol Physiol 2021; 34:94-102. [PMID: 33730739 DOI: 10.1159/000513725] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 12/07/2020] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Tumor necrosis factor alpha (TNFα) is a pro-inflammatory cytokine that may paradoxically induce either apoptosis or cell survival. It mediates its activity through binding of TNF-receptor (TNFR) 1 or 2. TNFR1 is mainly responsible for transmitting apoptotic signals. The activation of apoptotic mechanisms can either be intrinsic (mitochondrial) or extrinsic (death receptors). Death ligands such as TNF-related apoptosis-inducing ligand (TRAIL) specifically induce extrinsic apoptosis, while cytostatic drugs such as 5-fluorouracil (5FU) induce intrinsic apoptosis. OBJECTIVES To investigate the effects of TNFα on apoptosis in malignant and normal human keratinocytes. METHODS Human cutaneous squamous cell carcinoma (SCC) cell line SCC-13 and immortalized human keratinocytes HaCaT as well as primary normal human keratinocytes (PNHK) were stimulated with TNFα and then treated either with TRAIL or 5FU. Cell viability and cell proliferation, DNA fragmentation, apoptosis, and cytotoxicity were determined by WST-1 proliferation assay, ELISA, flow cytometry, and colorimetric analysis of lactate dehydrogenase, respectively. In addition, Western blotting was performed for analysis of caspase-3. RESULTS TNFα affected viability of SCC-13 and HaCaT cells in combination with 5FU or TRAIL. In contrast, TNFα did not influence cell viability of PNHK. It enhanced the apoptotic effects of both extrinsic and intrinsic stimuli in SCC-13 and HaCaT. In clear contrast, TNFα protected PNHK against TRAIL- and 5FU-induced apoptosis. The effects were dose-dependent and TNFα-specific; furthermore, the apoptosis pathway was caspase-dependent. CONCLUSIONS In summary, opposing effects of TNFα in malignant versus normal human keratinocytes were observed with possibly relevant clinical implications, when patients are treated with TNFα inhibitors.
Collapse
Affiliation(s)
- Georgios Kokolakis
- Interdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany, .,Psoriasis Research and Treatment Centre, Charité - Universitätsmedizin Berlin, Berlin, Germany, .,Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Berlin, Germany,
| | - Robert Sabat
- Interdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany.,Psoriasis Research and Treatment Centre, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Sabine Krüger-Krasagakis
- Department of Dermatology and Venereology, School of Medicine, University of Crete, Heraklion, Greece
| | - Jürgen Eberle
- Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Berlin, Germany.,Department of Dermatology, Venereology and Allergology, Skin Cancer Center Charité, Charité - Universitätsmedizin Berlin, Berlin, Germany
| |
Collapse
|
2
|
Yang J, Liu X, Huang Y, He L, Zhang W, Ren J, Wang Y, Wu J, Wu X, Shan L, Yang X, Sun L, Liang J, Zhang Y, Shang Y. TRPS1 drives heterochromatic origin refiring and cancer genome evolution. Cell Rep 2021; 34:108814. [PMID: 33691114 DOI: 10.1016/j.celrep.2021.108814] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 12/18/2020] [Accepted: 02/10/2021] [Indexed: 02/06/2023] Open
Abstract
Exploitation of naturally occurring genetic mutations could empower the discovery of novel aspects of established cancer genes. We report here that TRPS1, a gene linked to the tricho-rhino-phalangeal syndrome (TRPS) and recently identified as a potential breast cancer driver, promotes breast carcinogenesis through regulating replication. Epigenomic decomposition of TRPS1 landscape reveals nearly half of H3K9me3-marked heterochromatic origins are occupied by TRPS1, where it encourages the chromatin loading of APC/C, resulting in uncontrolled origin refiring. TRPS1 binds to the genome through its atypical H3K9me3 reading via GATA and IKAROS domains, while TRPS-related mutations affect its chromatin binding, replication boosting, and tumorigenicity. Concordantly, overexpression of wild-type but not TRPS-associated mutants of TRPS1 is sufficient to drive cancer genome amplifications, which experience an extrachromosomal route and dynamically evolve to confer therapeutic resistance. Together, these results uncover a critical function of TRPS1 in driving heterochromatin origin firing and breast cancer genome evolution.
Collapse
Affiliation(s)
- Jianguo Yang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China
| | - Xiaoping Liu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China
| | - Yunchao Huang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China
| | - Lin He
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China
| | - Wenting Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China
| | - Jie Ren
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China
| | - Yue Wang
- Department of Biochemistry and Molecular Biology, School of Medicine, Hangzhou Normal University, Hangzhou 311121, China; Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - Jiajing Wu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - Xiaodi Wu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - Lin Shan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - Xiaohan Yang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China
| | - Luyang Sun
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China
| | - Jing Liang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China
| | - Yu Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China.
| | - Yongfeng Shang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Health Science Center, Beijing 100191, China; Department of Biochemistry and Molecular Biology, School of Medicine, Hangzhou Normal University, Hangzhou 311121, China; Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China.
| |
Collapse
|
3
|
Yang SH, Liu CT, Hong CQ, Huang ZY, Wang HZ, Wei LF, Lin YW, Guo HP, Peng YH, Xu YW. Autoantibodies against p53, MMP-7, and Hsp70 as Potential Biomarkers for Detection of Nonmelanoma Skin Cancers. DISEASE MARKERS 2021; 2021:5592693. [PMID: 34336006 PMCID: PMC8289574 DOI: 10.1155/2021/5592693] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 05/31/2021] [Indexed: 02/05/2023]
Abstract
Basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) are two predominant histological types of nonmelanoma skin cancer (NMSC), lacking effective early diagnostic markers. In this study, we assessed the diagnostic value of autoantibodies against p53, MMP-7, and Hsp70 in skin SCC and BCC. ELISA was performed to detect levels of autoantibodies in sera from 101 NMSC patients and 102 normal controls, who were recruited from the Cancer Hospital of Shantou University Medical College. A receiver operator characteristic curve was used to evaluate the diagnostic value. The serum levels of autoantibodies against p53, MMP-7, and Hsp70 were higher in NMSCs than those in the normal controls (all P < 0.01). The AUC of the three-autoantibody panel was 0.841 (95% CI: 0.788-0.894) with the sensitivity and specificity of 60.40% and 91.20% when differentiating NMSCs from normal controls. Furthermore, measurement of this panel could differentiate early-stage skin cancer patients from normal controls (AUC: 0.851; 95% CI: 0.793-0.908). Data from Oncomine showed that the level of p53 mRNA was elevated in BCC (P < 0.05), and the Hsp70 mRNA was upregulated in SCC (P < 0.001). This serum three-autoantibody panel might function in assisting the early diagnosis of NMSC.
Collapse
Affiliation(s)
- Shi-Han Yang
- Department of Dermatology and Venereology, Affiliated Shantou Hospital of Sun Yat-sen University, 114 Waima Road, Shantou 515041, China
| | - Can-Tong Liu
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, 7 Raoping Road, Shantou 515041, China
- Precision Medicine Research Center, Shantou University Medical College, 22 Xinling Road, Shantou 515041, China
| | - Chao-Qun Hong
- Department of Oncological Laboratory Research, The Cancer Hospital of Shantou University Medical College, 7 Raoping Road, Shantou 515041, China
| | - Ze-Yuan Huang
- Department of Dermatology and Venereology, Affiliated Shantou Hospital of Sun Yat-sen University, 114 Waima Road, Shantou 515041, China
| | - Huan-Zhu Wang
- Department of Dermatology and Venereology, Affiliated Shantou Hospital of Sun Yat-sen University, 114 Waima Road, Shantou 515041, China
| | - Lai-Feng Wei
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, 7 Raoping Road, Shantou 515041, China
- Precision Medicine Research Center, Shantou University Medical College, 22 Xinling Road, Shantou 515041, China
| | - Yi-Wei Lin
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, 7 Raoping Road, Shantou 515041, China
- Precision Medicine Research Center, Shantou University Medical College, 22 Xinling Road, Shantou 515041, China
| | - Hai-Peng Guo
- Department of Head and Neck Surgery, The Cancer Hospital of Shantou University Medical College, 7 Raoping Road, Shantou 515041, China
| | - Yu-Hui Peng
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, 7 Raoping Road, Shantou 515041, China
- Precision Medicine Research Center, Shantou University Medical College, 22 Xinling Road, Shantou 515041, China
- Guangdong Esophageal Cancer Research Institute, Shantou University Medical College, 22 Xinling Road, Shantou 515041, China
| | - Yi-Wei Xu
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, 7 Raoping Road, Shantou 515041, China
- Precision Medicine Research Center, Shantou University Medical College, 22 Xinling Road, Shantou 515041, China
- Guangdong Esophageal Cancer Research Institute, Shantou University Medical College, 22 Xinling Road, Shantou 515041, China
| |
Collapse
|
4
|
Song Y, Li Z, Wang Y, Qu Y, Li Q, Man X, Wang F, Hu D. Inhibition of BAG‐1 induced SH‐SY5Y cell apoptosis without affecting Hsp70 expression. J Cell Biochem 2019; 121:1728-1735. [PMID: 31609014 DOI: 10.1002/jcb.29408] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2018] [Accepted: 08/28/2019] [Indexed: 01/10/2023]
Affiliation(s)
- Yan‐Kun Song
- Department of Pediatric Emergency The Affiliated Hospital of Qingdao University Qingdao Shandong China
| | - Zhi Li
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
| | - Yun Wang
- Department of Pediatric Emergency The Affiliated Hospital of Qingdao University Qingdao Shandong China
| | - Yan Qu
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
| | - Qing‐Shu Li
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
| | - Xiao‐Yun Man
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
| | - Feng‐Tao Wang
- Department of Pediatric Emergency The Affiliated Hospital of Qingdao University Qingdao Shandong China
| | - Dan Hu
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
| |
Collapse
|
5
|
Gracia-Cazaña T, González S, Gilaberte Y. Resistance of Nonmelanoma Skin Cancer to Nonsurgical Treatments. Part I: Topical Treatments. ACTAS DERMO-SIFILIOGRAFICAS 2016. [DOI: 10.1016/j.adengl.2016.08.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
|
6
|
Gracia-Cazaña T, González S, Gilaberte Y. Resistance of Nonmelanoma Skin Cancer to Nonsurgical Treatments. Part I: Topical Treatments. ACTAS DERMO-SIFILIOGRAFICAS 2016; 107:730-739. [PMID: 27436800 DOI: 10.1016/j.ad.2016.04.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 04/22/2016] [Accepted: 04/30/2016] [Indexed: 10/21/2022] Open
Abstract
A wide range of treatments is now available for nonmelanoma skin cancer (NMSC), including 5-fluorouracil, ingenol mebutate, imiquimod, diclofenac, photodynamic therapy, methotrexate, cetuximab, vismodegib, and radiotherapy. All are associated with high clinical and histologic response rates. However, some tumors do not respond due to resistance, which may be primary or acquired. Study of the resistance processes is a broad area of research that aims to increase our understanding of the nature of each tumor and the biologic features that make it resistant, as well as to facilitate the design of new therapies directed against these tumors. In this article we review resistance to the authorized topical treatments for NMSC.
Collapse
Affiliation(s)
- T Gracia-Cazaña
- Unidad de Dermatología, Hospital de Barbastro, Barbastro, Huesca, España; Instituto Aragonés de Ciencias de la Salud, Zaragoza, España.
| | - S González
- Servicio de Dermatología, Memorial Sloan-Kettering Cancer Center. Nueva York, EE. UU.; Departmento de Medicina, Universidad de Alcalá, Alcalá de Henares, Madrid, España
| | - Y Gilaberte
- Instituto Aragonés de Ciencias de la Salud, Zaragoza, España; Unidad de Dermatología, Hospital San Jorge, Huesca, España
| |
Collapse
|
7
|
Wendel T, Zhen Y, Suo Z, Bruheim S, Wiedlocha A. The novel HSP90 inhibitor NVP-AUY922 shows synergistic anti-leukemic activity with cytarabine in vivo. Exp Cell Res 2015; 340:220-6. [PMID: 26748184 DOI: 10.1016/j.yexcr.2015.12.017] [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: 03/17/2015] [Revised: 11/29/2015] [Accepted: 12/30/2015] [Indexed: 02/07/2023]
Abstract
HSP90 is a molecular chaperone essential for stability, activity and intracellular sorting of many proteins, including oncoproteins, such as tyrosine kinases, transcription factors and cell cycle regulatory proteins. Therefore, inhibitors of HSP90 are being investigated for their potential as anti-cancer drugs. Here we show that the HSP90 inhibitor NVP-AUY922 induced degradation of the fusion oncoprotein FOP2-FGFR1 in a human acute myeloid leukemia (AML) cell line, KG-1a. Concordantly, downstream signaling cascades, such as STAT1, STAT3 and PLCγ were abrogated. At concentrations that caused FOP2-FGFR1 degradation and signaling abrogation, NVP-AUY922 treatment caused significant cell death and inhibition of proliferation of KG-1a cells in vitro. In an animal model for AML, NVP-AUY922 administrated alone showed no anti-leukemic activity. However, when NVP-AUY922 was administered in combination with cytarabine, the two compounds showed significant synergistic anti-leukemic activity in vivo. Thus NVP-AUY922 and cytarabine combination therapy might be a prospective strategy for AML treatment.
Collapse
Affiliation(s)
- Torunn Wendel
- Department of Molecular Cell Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Montebello, 0379 Oslo, Norway; Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Norway
| | - Yan Zhen
- Department of Molecular Cell Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Montebello, 0379 Oslo, Norway; Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Norway
| | - Zenhe Suo
- Department of Pathology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Skjalg Bruheim
- Department of Tumor Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Montebello, 0379 Oslo, Norway.
| | - Antoni Wiedlocha
- Department of Molecular Cell Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Montebello, 0379 Oslo, Norway; Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Norway.
| |
Collapse
|
8
|
Lin D, Lin H, Xiong X. Expression and role of BAG-1 in eosinophilic and non-eosinophilic chronic rhinosinusitis with nasal polyps. Inflammation 2015; 37:1912-8. [PMID: 24830325 DOI: 10.1007/s10753-014-9923-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The pathogenesis of human eosinophilic and non-eosinophilic chronic rhinosinusitis with nasal polyps (ECRSwNP and nECRSwNP) remains undetermined. We aimed to investigate the expression and role of Bcl-2-associated athanogene-1 (BAG-1) and heat shock protein 70 (Hsp70) in ECRSwNP and nECRSwNP. BAG-1 protein expression was investigated by immunohistochemistry and western blotting, and messenger RNA (mRNA) expression of BAG-1 and Hsp70 was assessed by real-time polymerase chain reaction (PCR) in 27 subjects with ECRSwNP, 28 subjects with nECRSwNP, and 23 control subjects. Moreover, the effects of various stimulators with different concentrations and time on BAG-1 were evaluated on a nasal explant culture. Results showed that significant elevations in total visual analog scale (VAS) score, endoscopy score, CT score, and rate of positive skin prick test (SPT) were found in the ECRSwNP group compared with the nECRSwNP group. BAG-1 and Hsp70 were overexpressed in CRSwNP, especially in ECRSwNP, and BAG-1 expression was closely related to Hsp70. BAG-1 mRNA was augmented by IL-4, IL-17A, and IL-1β, but suppressed by IFN-γ, respectively. In conclusion, eosinophils triggered a more severe form of inflammation in CRSwNP compared with non-eosinophilic inflammatory cells. The expressions of BAG-1 and Hsp70 were upregulated in CRSwNP, especially in ECRSwNP. IL-4, IL-17A, and IL-1β may be critical for BAG-1 gene expression.
Collapse
Affiliation(s)
- Dong Lin
- Department of Biology and Chemical Engineering, Fuqing Branch of Fujian Normal University, Fuqing, 350300, Fujian, China
| | | | | |
Collapse
|
9
|
Cell cycle association and hypoxia regulation of excision repair cross complementation group 1 protein (ERCC1) in tumor cells of head and neck cancer. Tumour Biol 2014; 35:7807-19. [PMID: 24817012 PMCID: PMC4158184 DOI: 10.1007/s13277-014-2001-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2014] [Accepted: 04/22/2014] [Indexed: 12/18/2022] Open
Abstract
Excision repair cross complementation group 1 (ERCC1) is a key component of homologous recombination-based repair of interstrand DNA cross-links (ICLs). As a consequence, ERCC1 mediates resistance to mitomycin C (MMC) and platinum chemotherapeutic agents and may predict treatment failure. Clinical response to MMC or cisplatin (CDDP)-based radiochemotherapy (RCT) was assessed in 106 head and neck squamous cell carcinoma (HNSCC) patients and correlated with cell nuclear immunoreactivity of the mouse monoclonal (clone: 8 F1) ERCC1 antibody in tumor tissue samples. BEAS-2B epithelial and Detroit 562 pharyngeal squamous carcinoma cells were treated with CDDP, MMC, and 5-fluorouracil (5-FU) at 50 % growth inhibitory (IC-50) concentrations. ERCC1 protein synthesis was compared with cell cycle distribution using combined immunocytochemistry and flow cytometry. ERCC1 messenger RNA (mRNA) and protein expression was investigated in normoxic and hypoxic conditions in Detroit 562 cells. Clinically, the nonresponder revealed significantly lower HNSCC tissue ERCC1 immunoreactivity than the responder (p = 0.0064) or control normal mucosa, which led to further mechanistic investigations. In vitro, control cells and cells treated with cytotoxic agents showed increasing ERCC1 levels from the G1 through S and G2 phases of the cell cycle. In CDDP-treated cells, ERCC1 mRNA and protein expression increased. Under hypoxic conditions, ERCC1 gene expression significantly decreased. Although ERCC1+ cells show increased chemoresistance, they might be particularly radiosensitive, representing G2 cell cycle phase and less hypoxic. ERCC1 expression might be indirectly related with some conditions important for RCT treatment, but it is not a clear predictor for its failure in HNSCC patients.
Collapse
|
10
|
|
11
|
Fernandez TL, Dawson RA, Van Lonkhuyzen DR, Kimlin MG, Upton Z. A tan in a test tube -in vitro models for investigating ultraviolet radiation-induced damage in skin. Exp Dermatol 2012; 21:404-10. [DOI: 10.1111/j.1600-0625.2012.01485.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
12
|
BAG-1L promotes keratinocyte differentiation in organotypic culture models and changes in relative BAG-1 isoform abundance may lead to defective stratification. Exp Cell Res 2011; 317:2159-70. [PMID: 21723279 DOI: 10.1016/j.yexcr.2011.06.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 05/31/2011] [Accepted: 06/16/2011] [Indexed: 01/23/2023]
Abstract
In keratinocytes the human Bag-1 gene produces three different protein isoforms from a single messenger RNA, BAG-1L, BAG-1M and BAG-1S. In this study we questioned whether BAG-1L or the shorter isoforms would promote keratinocyte differentiation in organotypic cultures of HaCaT. HaCaT parental and vector cells showed stratification, but terminal differentiation was not complete. Cultures overexpressing BAG-1L isoform-specifically were of increased thickness, demonstrated pronounced expression of basal cytokeratin 5 and β1-integrin, suprabasal involucrin, cytokeratin 1 and plasma membrane-localised filaggrin, and a marked keratinized layer of cells at the surface. We were unable to overexpress BAG-1S and BAG-1M isoform-specifically. Overexpression of BAG-1M gave rise to organotypic cultures intermediate in differentiation to controls and those overexpressing BAG-1L. Cells overexpressing BAG-1S also exhibited elevated endogenous BAG-1. These produced slow growing cultures with high levels of basal cytokeratin 5, but little involucrin or cytokeratin 1. Suprabasal β1-integrin and Ki67 positive cells indicated defective stratification. The results suggest that BAG-1L potentiates epidermal differentiation, but disruption in the relative balance of isoforms towards overexpression of BAG-1S can lead to defective tissue patterning. Hence, a delicate balance of BAG-1 isoforms may be required to regulate normal epidermal stratification and differentiation, with important implications for aberrant differentiation in cancer.
Collapse
|