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Nasrallah NA, Wiese BM, Sears CR. Xeroderma Pigmentosum Complementation Group C (XPC): Emerging Roles in Non-Dermatologic Malignancies. Front Oncol 2022; 12:846965. [PMID: 35530314 PMCID: PMC9069926 DOI: 10.3389/fonc.2022.846965] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 03/09/2022] [Indexed: 11/13/2022] Open
Abstract
Xeroderma pigmentosum complementation group C (XPC) is a DNA damage recognition protein essential for initiation of global-genomic nucleotide excision repair (GG-NER). Humans carrying germline mutations in the XPC gene exhibit strong susceptibility to skin cancer due to defective removal via GG-NER of genotoxic, solar UV-induced dipyrimidine photoproducts. However, XPC is increasingly recognized as important for protection against non-dermatologic cancers, not only through its role in GG-NER, but also by participating in other DNA repair pathways, in the DNA damage response and in transcriptional regulation. Additionally, XPC expression levels and polymorphisms likely impact development and may serve as predictive and therapeutic biomarkers in a number of these non-dermatologic cancers. Here we review the existing literature, focusing on the role of XPC in non-dermatologic cancer development, progression, and treatment response, and highlight possible future applications of XPC as a prognostic and therapeutic biomarker.
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Affiliation(s)
- Nawar Al Nasrallah
- Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Benjamin M. Wiese
- Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Catherine R. Sears
- Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, United States
- Division of Pulmonary Medicine, Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, IN, United States
- *Correspondence: Catherine R. Sears,
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Kusakabe M, Kakumu E, Kurihara F, Tsuchida K, Maeda T, Tada H, Kusao K, Kato A, Yasuda T, Matsuda T, Nakao M, Yokoi M, Sakai W, Sugasawa K. Histone deacetylation regulates nucleotide excision repair through an interaction with the XPC protein. iScience 2022; 25:104040. [PMID: 35330687 PMCID: PMC8938288 DOI: 10.1016/j.isci.2022.104040] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 02/07/2022] [Accepted: 03/04/2022] [Indexed: 12/05/2022] Open
Abstract
The XPC protein complex plays a central role in DNA lesion recognition for global genome nucleotide excision repair (GG-NER). Lesion recognition can be accomplished in either a UV-DDB-dependent or -independent manner; however, it is unclear how these sub-pathways are regulated in chromatin. Here, we show that histone deacetylases 1 and 2 facilitate UV-DDB-independent recruitment of XPC to DNA damage by inducing histone deacetylation. XPC localizes to hypoacetylated chromatin domains in a DNA damage-independent manner, mediated by its structurally disordered middle (M) region. The M region interacts directly with the N-terminal tail of histone H3, an interaction compromised by H3 acetylation. Although the M region is dispensable for in vitro NER, it promotes DNA damage removal by GG-NER in vivo, particularly in the absence of UV-DDB. We propose that histone deacetylation around DNA damage facilitates the recruitment of XPC through the M region, contributing to efficient lesion recognition and initiation of GG-NER. Histone deacetylation by HDAC1/2 promotes the DNA lesion recognition by XPC The HDAC1/2 activators, MTA proteins, also promote the recruitment of XPC XPC tends to localize in hypoacetylated chromatin independently of DNA damage Disordered middle region of XPC interacts with histone H3 tail and promotes GG-NER
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3
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Telomeres and Cancer. Life (Basel) 2021; 11:life11121405. [PMID: 34947936 PMCID: PMC8704776 DOI: 10.3390/life11121405] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/01/2021] [Accepted: 12/06/2021] [Indexed: 12/18/2022] Open
Abstract
Telomeres cap the ends of eukaryotic chromosomes and are indispensable chromatin structures for genome protection and replication. Telomere length maintenance has been attributed to several functional modulators, including telomerase, the shelterin complex, and the CST complex, synergizing with DNA replication, repair, and the RNA metabolism pathway components. As dysfunctional telomere maintenance and telomerase activation are associated with several human diseases, including cancer, the molecular mechanisms behind telomere length regulation and protection need particular emphasis. Cancer cells exhibit telomerase activation, enabling replicative immortality. Telomerase reverse transcriptase (TERT) activation is involved in cancer development through diverse activities other than mediating telomere elongation. This review describes the telomere functions, the role of functional modulators, the implications in cancer development, and the future therapeutic opportunities.
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Chen JC, Ko JC, Taso YC, Cheng HH, Chen TY, Yen TC, Lin YW. Downregulation of Xeroderma Pigmentosum Complementation Group C Expression by 17-Allylamino-17-Demethoxygeldanamycin Enhances Bevacizumab-Induced Cytotoxicity in Human Lung Cancer Cells. Pharmacology 2020; 106:154-168. [PMID: 33202406 DOI: 10.1159/000509052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 05/29/2020] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Xeroderma pigmentosum complementation group C (XPC) protein is an important DNA damage recognition factor involved in nucleotide excision repair and regulation of non-small-cell lung cancer (NSCLC) cell proliferation and viability. 17-Allylamino-17-demethoxygeldanamycin (17-AAG) blocks ATP binding to heat shock protein 90 (Hsp90), resulting in destabilization of Hsp90-client protein complexes. Vascular endothelial growth factor (VEGF) is a potent angiogenic growth factor expressed by many types of tumors. Bevacizumab (Avastin) is a humanized monoclonal antibody against human VEGF used as an antiangiogenesis agent in the therapy of many cancers, proving successful in increasing objective tumor response rate and prolonging overall survival in NSCLC patients. METHODS After the bevacizumab and/or 17-AAG treatment, the expressions of XPC mRNA were determined by quantitative real-time PCR analysis. Protein levels of XPC and phospho-AKT were determined by Western blot analysis. We used specific XPC small interfering RNA and PI3K inhibitor (LY294002) to examine the role of the AKT-XPC signal in regulating the chemosensitivity of bevacizumab and 17-AAG. Cell viability was assessed by the MTS assay and trypan blue exclusion assay. RESULTS In this study, bevacizumab decreased XPC expression in human lung squamous cell carcinoma H520 and H1703 cells via AKT inactivation. Enhancement of AKT activity by transfection with constitutively active AKT vectors increased XPC expression and cell survival after treatment with bevacizumab. In addition, 17-AAG synergistically enhanced bevacizumab-induced cytotoxicity and cell growth inhibition in H520 and H1703 cells, associated with downregulation of XPC expression and inactivation of AKT. DISCUSSION/CONCLUSION Together, these results may provide a rationale to combine bevacizumab with Hsp90 inhibitors in future to enhance therapeutic effects for lung cancer.
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Affiliation(s)
- Jyh-Cheng Chen
- Department of Food Science, National Chiayi University, Chiayi, Taiwan
| | - Jen-Chung Ko
- Department of Internal Medicine, National Taiwan University Hospital, Hsin-Chu Branch, Hsin-Chu, Taiwan
| | - Yong-Cing Taso
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Hsiang-Hung Cheng
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Tzu-Ying Chen
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Ting-Chuan Yen
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Yun-Wei Lin
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan,
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5
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McCann JJ, Vasilevskaya IA, Poudel Neupane N, Shafi AA, McNair C, Dylgjeri E, Mandigo AC, Schiewer MJ, Schrecengost RS, Gallagher P, Stanek TJ, McMahon SB, Berman-Booty LD, Ostrander WF, Knudsen KE. USP22 Functions as an Oncogenic Driver in Prostate Cancer by Regulating Cell Proliferation and DNA Repair. Cancer Res 2020; 80:430-443. [PMID: 31740444 PMCID: PMC7814394 DOI: 10.1158/0008-5472.can-19-1033] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 10/02/2019] [Accepted: 11/13/2019] [Indexed: 02/06/2023]
Abstract
Emerging evidence indicates the deubiquitinase USP22 regulates transcriptional activation and modification of target substrates to promote pro-oncogenic phenotypes. Here, in vivo characterization of tumor-associated USP22 upregulation and unbiased interrogation of USP22-regulated functions in vitro demonstrated critical roles for USP22 in prostate cancer. Specifically, clinical datasets validated that USP22 expression is elevated in prostate cancer, and a novel murine model demonstrated a hyperproliferative phenotype with prostate-specific USP22 overexpression. Accordingly, upon overexpression or depletion of USP22, enrichment of cell-cycle and DNA repair pathways was observed in the USP22-sensitive transcriptome and ubiquitylome using prostate cancer models of clinical relevance. Depletion of USP22 sensitized cells to genotoxic insult, and the role of USP22 in response to genotoxic insult was further confirmed using mouse adult fibroblasts from the novel murine model of USP22 expression. As it was hypothesized that USP22 deubiquitylates target substrates to promote protumorigenic phenotypes, analysis of the USP22-sensitive ubiquitylome identified the nucleotide excision repair protein, XPC, as a critical mediator of the USP22-mediated response to genotoxic insult. Thus, XPC undergoes deubiquitylation as a result of USP22 function and promotes USP22-mediated survival to DNA damage. Combined, these findings reveal unexpected functions of USP22 as a driver of protumorigenic phenotypes and have significant implications for the role of USP22 in therapeutic outcomes. SIGNIFICANCE: The studies herein present a novel mouse model of tumor-associated USP22 overexpression and implicate USP22 in modulation of cellular survival and DNA repair, in part through regulation of XPC.
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Affiliation(s)
- Jennifer J McCann
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Irina A Vasilevskaya
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | | | - Ayesha A Shafi
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Christopher McNair
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Emanuela Dylgjeri
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Amy C Mandigo
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Matthew J Schiewer
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Randy S Schrecengost
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Peter Gallagher
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Timothy J Stanek
- Department of Biochemistry & Molecular Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Steven B McMahon
- Department of Biochemistry & Molecular Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Lisa D Berman-Booty
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - William F Ostrander
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Karen E Knudsen
- Department of Cancer Biology, Sidney Kimmel Medical College, Philadelphia, Pennsylvania.
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Qasemian-Talgard A, Saadat M. Association between three common genetic polymorphisms of XPC and susceptibility to heroin dependency. Gene 2020; 724:144153. [PMID: 31610221 DOI: 10.1016/j.gene.2019.144153] [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: 05/18/2019] [Revised: 10/01/2019] [Accepted: 10/01/2019] [Indexed: 10/25/2022]
Abstract
As heroin and morphine produce reactive oxygen species and down-regulate several genes involved in cellular detoxification and DNA repair pathways, neurons experience DNA damage. Xeroderma pigmentosum complementation group C (XPC, OMIM: 613208) gene, which is expressed in the brain, is one of the central genes in the nucleotide excision repair pathway. Three common XPC polymorphisms (Lys939Gln, Ala499Val and PAT) are associated with reduced DNA repair capacity. In this study, the relationship between these polymorphisms and the risk of heroin dependency (HD), as well as, age of first use (AFU) for illegal drugs was investigated on 795 healthy individuals and 442 heroin dependent patients. Statistical analyses indicated that there was no significant association between the XPC polymorphisms and the risk of HD. The haplotypic frequencies of the polymorphisms showed significant difference between HD patients and healthy controls (χ2 = 16.38, df = 6, P = 0.012). Analysis indicated that the "Ala + Gln" haplotype increased the HD risk more than the "Ala + Lys" haplotype (OR = 4.21, 95% CI = 1.29-13.7, P = 0.017). In Cox proportional model, there was significant association between AFU and the Ala499Val polymorphism (Hazard ratio = 1.53, 95% CI: 1.02-2.92, P = 0.036). To investigate the effect of the linkage between the polymorphic sites, we compared the AFU among two common diplotypes ("Ala - Lys/Ala - Lys" and "Val - Lys/Val - Lys"). Statistical analysis indicated that AFU was significantly lower in "Val - Lys/Val - Lys" diplotype (t = 2.63, df = 49, P = 0.011). The present findings suggest that the XPC is a candidate polymorphic locus for AFU.
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Affiliation(s)
| | - Mostafa Saadat
- Department of Biology, College of Sciences, Shiraz University, Shiraz, Iran.
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Apostolou Z, Chatzinikolaou G, Stratigi K, Garinis GA. Nucleotide Excision Repair and Transcription-Associated Genome Instability. Bioessays 2019; 41:e1800201. [PMID: 30919497 DOI: 10.1002/bies.201800201] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 12/10/2018] [Indexed: 12/12/2022]
Abstract
Transcription is a potential threat to genome integrity, and transcription-associated DNA damage must be repaired for proper messenger RNA (mRNA) synthesis and for cells to transmit their genome intact into progeny. For a wide range of structurally diverse DNA lesions, cells employ the highly conserved nucleotide excision repair (NER) pathway to restore their genome back to its native form. Recent evidence suggests that NER factors function, in addition to the canonical DNA repair mechanism, in processes that facilitate mRNA synthesis or shape the 3D chromatin architecture. Here, these findings are critically discussed and a working model that explains the puzzling clinical heterogeneity of NER syndromes highlighting the relevance of physiological, transcription-associated DNA damage to mammalian development and disease is proposed.
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Affiliation(s)
- Zivkos Apostolou
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Nikolaou Plastira 100, Heraklion 70013, Crete, Greece.,Department of Biology, University of Crete, Vassilika Vouton, Heraklion GR71409, Crete, Greece
| | - Georgia Chatzinikolaou
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Nikolaou Plastira 100, Heraklion 70013, Crete, Greece
| | - Kalliopi Stratigi
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Nikolaou Plastira 100, Heraklion 70013, Crete, Greece
| | - George A Garinis
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Nikolaou Plastira 100, Heraklion 70013, Crete, Greece.,Department of Biology, University of Crete, Vassilika Vouton, Heraklion GR71409, Crete, Greece
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8
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Immunity to commensal papillomaviruses protects against skin cancer. Nature 2019; 575:519-522. [PMID: 31666702 PMCID: PMC6872936 DOI: 10.1038/s41586-019-1719-9] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 09/03/2019] [Indexed: 12/14/2022]
Abstract
Immunosuppression increases the risk of cancers associated with viral
infection1. In
particular, squamous cell carcinoma (SCC) of the skin has a >100-fold
increased risk in immunosuppressed patients and has been associated with beta
human papillomavirus (β-HPV) infection2–4. Previous
studies, however, have failed to establish a causative role for HPVs in driving
skin cancer development. Herein, we provide an alternative explanation for this
association by demonstrating that the T cell immunity against commensal
papillomaviruses suppresses skin cancer in immunocompetent hosts. The loss of
this immunity, rather than the oncogenic effect of HPVs, is the reason for the
markedly increased risk of skin cancer in immunosuppressed patients. To
investigate the impact of papillomavirus on carcinogen-driven skin cancer, we
colonized several strains of immunocompetent mice with mouse papillomavirus type
1 (MmuPV1)5. Mice with natural
anti-MmuPV1 immunity after colonization and acquired immunity due to T cell
transfer from immune mice or MmuPV1 vaccination were protected against chemical-
and ultraviolet (UV)-induced skin carcinogenesis in a CD8+ T
cell-dependent manner. RNA and DNA in situ hybridizations for 25 commensal
β-HPVs revealed a significant reduction in viral activity and load in
human skin cancer compared to the adjacent normal skin, suggesting a strong
immune selection against virus-positive malignant cells. Consistently,
β-HPV E7 peptides activated CD8+ T cells from normal human
skin. Our findings reveal a beneficial role for commensal viruses and establish
the foundation for novel immune-based approaches to block skin cancer
development by boosting immunity against the commensal HPVs present in all of
our skin.
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Abstract
Nucleotide excision repair (NER) is a highly conserved mechanism to remove helix-distorting DNA lesions. A major substrate for NER is DNA damage caused by environmental genotoxins, most notably ultraviolet radiation. Xeroderma pigmentosum, Cockayne syndrome and trichothiodystrophy are three human disorders caused by inherited defects in NER. The symptoms and severity of these diseases vary dramatically, ranging from profound developmental delay to cancer predisposition and accelerated ageing. All three syndromes include developmental abnormalities, indicating an important role for optimal transcription and for NER in protecting against spontaneous DNA damage during embryonic development. Here, we review the current knowledge on genes that function in NER that also affect embryonic development, in particular the development of a fully functional nervous system.
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Affiliation(s)
- Sofia J Araújo
- Department of Genetics, Microbiology and Statistics, Faculty of Biology, University of Barcelona, 08028 Barcelona, Spain.,Institute of Biomedicine, University of Barcelona (IBUB), Barcelona, Spain
| | - Isao Kuraoka
- Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan
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10
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Differential mechanisms of tolerance to extreme environmental conditions in tardigrades. Sci Rep 2019; 9:14938. [PMID: 31624306 PMCID: PMC6797769 DOI: 10.1038/s41598-019-51471-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 09/29/2019] [Indexed: 01/17/2023] Open
Abstract
Tardigrades, also known as water bears, are small aquatic animals that inhabit marine, fresh water or limno-terrestrial environments. While all tardigrades require surrounding water to grow and reproduce, species living in limno-terrestrial environments (e.g. Ramazzottius varieornatus) are able to undergo almost complete dehydration by entering an arrested state known as anhydrobiosis, which allows them to tolerate ionic radiation, extreme temperatures and intense pressure. Previous studies based on comparison of the genomes of R. varieornatus and Hypsibius dujardini - a less tolerant tardigrade - have pointed to potential mechanisms that may partially contribute to their remarkable ability to resist extreme physical conditions. In this work, we have further annotated the genomes of both tardigrades using a guided approach in search for novel mechanisms underlying the extremotolerance of R. varieornatus. We have found specific amplifications of several genes, including MRE11 and XPC, and numerous missense variants exclusive of R. varieornatus in CHEK1, POLK, UNG and TERT, all of them involved in important pathways for DNA repair and telomere maintenance. Taken collectively, these results point to genomic features that may contribute to the enhanced ability to resist extreme environmental conditions shown by R. varieornatus.
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11
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Zebian A, Shaito A, Mazurier F, Rezvani HR, Zibara K. XPC beyond nucleotide excision repair and skin cancers. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2019; 782:108286. [DOI: 10.1016/j.mrrev.2019.108286] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 05/23/2019] [Accepted: 07/05/2019] [Indexed: 12/17/2022]
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12
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Dogrusöz M, Ruschel Trasel A, Cao J, Ҫolak S, van Pelt SI, Kroes WGM, Teunisse AFAS, Alsafadi S, van Duinen SG, Luyten GPM, van der Velden PA, Amaro A, Pfeffer U, Jochemsen AG, Jager MJ. Differential Expression of DNA Repair Genes in Prognostically-Favorable versus Unfavorable Uveal Melanoma. Cancers (Basel) 2019; 11:cancers11081104. [PMID: 31382494 PMCID: PMC6721581 DOI: 10.3390/cancers11081104] [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: 06/21/2019] [Revised: 07/26/2019] [Accepted: 07/30/2019] [Indexed: 01/20/2023] Open
Abstract
Expression of DNA repair genes was studied in uveal melanoma (UM) in order to identify genes that may play a role in metastases formation. We searched for genes that are differentially expressed between tumors with a favorable and unfavorable prognosis. Gene-expression profiling was performed on 64 primary UM from the Leiden University Medical Center (LUMC), Leiden, The Netherlands. The expression of 121 genes encoding proteins involved in DNA repair pathways was analyzed: a total of 44 genes differed between disomy 3 and monosomy 3 tumors. Results were validated in a cohort from Genoa and Paris and the The Cancer Genome Atlas (TCGA) cohort. Expression of the PRKDC, WDR48, XPC, and BAP1 genes was significantly associated with clinical outcome after validation. PRKDC was highly expressed in metastasizing UM (p < 0.001), whereas WDR48, XPC, and BAP1 were lowly expressed (p < 0.001, p = 0.006, p = 0.003, respectively). Low expression of WDR48 and XPC was related to a large tumor diameter (p = 0.01 and p = 0.004, respectively), and a mixed/epithelioid cell type (p = 0.007 and p = 0.03, respectively). We conclude that the expression of WDR48, XPC, and BAP1 is significantly lower in UM with an unfavorable prognosis, while these tumors have a significantly higher expression of PRKDC. Pharmacological inhibition of DNA-PKcs resulted in decreased survival of UM cells. PRKDC may be involved in proliferation, invasion and metastasis of UM cells. Unraveling the role of DNA repair genes may enhance our understanding of UM biology and result in the identification of new therapeutic targets.
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Affiliation(s)
- Mehmet Dogrusöz
- Department of Ophthalmology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
- Department of Ophthalmology, Amsterdam University Medical Center, 1105 AZ Amsterdam, The Netherlands
| | - Andrea Ruschel Trasel
- Department of Ophthalmology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
- Universidade Federal do Rio Grande do Sul, 90040-060 Porto Alegre, Brazil
| | - Jinfeng Cao
- Department of Ophthalmology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
- Department of Ophthalmology, The Second Hospital of Jilin University, Changchun 130012, China
| | - Selҫuk Ҫolak
- Department of Molecular Cell Biology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
- Center for Reproductive Medicine, Elisabeth-TweeSteden Hospital, 5022 GC Tilburg, The Netherlands
| | - Sake I van Pelt
- Department of Ophthalmology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
| | - Wilma G M Kroes
- Department of Clinical Genetics, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
| | - Amina F A S Teunisse
- Department of Clinical Genetics, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
| | - Samar Alsafadi
- Department of Translational Research, PSL Research University, Institute Curie, 75248 Paris, France
| | - Sjoerd G van Duinen
- Department of Pathology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
| | - Gregorius P M Luyten
- Department of Ophthalmology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
| | - Pieter A van der Velden
- Department of Ophthalmology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
| | - Adriana Amaro
- Laboratory of Tumor Epigenetics, Department of Integrated Oncology Therapies, IRCCS Ospedale Policlinico San Martino, 16133 Genoa, Italy
| | - Ulrich Pfeffer
- Laboratory of Tumor Epigenetics, Department of Integrated Oncology Therapies, IRCCS Ospedale Policlinico San Martino, 16133 Genoa, Italy
| | - Aart G Jochemsen
- Department of Molecular Cell Biology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands
| | - Martine J Jager
- Department of Ophthalmology, Leiden University Medical Center, 2333 AZ Leiden, The Netherlands.
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Jager M, Blokzijl F, Kuijk E, Bertl J, Vougioukalaki M, Janssen R, Besselink N, Boymans S, de Ligt J, Pedersen JS, Hoeijmakers J, Pothof J, van Boxtel R, Cuppen E. Deficiency of nucleotide excision repair is associated with mutational signature observed in cancer. Genome Res 2019; 29:1067-1077. [PMID: 31221724 PMCID: PMC6633256 DOI: 10.1101/gr.246223.118] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 06/07/2019] [Indexed: 12/24/2022]
Abstract
Nucleotide excision repair (NER) is one of the main DNA repair pathways that protect cells against genomic damage. Disruption of this pathway can contribute to the development of cancer and accelerate aging. Mutational characteristics of NER-deficiency may reveal important diagnostic opportunities, as tumors deficient in NER are more sensitive to certain treatments. Here, we analyzed the genome-wide somatic mutational profiles of adult stem cells (ASCs) from NER-deficient Ercc1 -/Δ mice. Our results indicate that NER-deficiency increases the base substitution load twofold in liver but not in small intestinal ASCs, which coincides with the tissue-specific aging pathology observed in these mice. Moreover, NER-deficient ASCs of both tissues show an increased contribution of Signature 8 mutations, which is a mutational pattern with unknown etiology that is recurrently observed in various cancer types. The scattered genomic distribution of the base substitutions indicates that deficiency of global-genome NER (GG-NER) underlies the observed mutational consequences. In line with this, we observe increased Signature 8 mutations in a GG-NER-deficient human organoid culture, in which XPC was deleted using CRISPR-Cas9 gene-editing. Furthermore, genomes of NER-deficient breast tumors show an increased contribution of Signature 8 mutations compared with NER-proficient tumors. Elevated levels of Signature 8 mutations could therefore contribute to a predictor of NER-deficiency based on a patient's mutational profile.
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Affiliation(s)
- Myrthe Jager
- Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Francis Blokzijl
- Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Ewart Kuijk
- Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Johanna Bertl
- Department of Molecular Medicine, Aarhus University, 8200 Aarhus N, Denmark
| | | | - Roel Janssen
- Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Nicolle Besselink
- Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Sander Boymans
- Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Joep de Ligt
- Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, The Netherlands
| | | | | | - Joris Pothof
- Erasmus Medical Center, 3015 CN Rotterdam, The Netherlands
| | - Ruben van Boxtel
- Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Edwin Cuppen
- Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, The Netherlands
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14
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Chen JC, Wu CH, Peng YS, Zheng HY, Lin YC, Ma PF, Yen TC, Chen TY, Lin YW. Astaxanthin enhances erlotinib-induced cytotoxicity by p38 MAPK mediated xeroderma pigmentosum complementation group C (XPC) down-regulation in human lung cancer cells. Toxicol Res (Camb) 2018; 7:1247-1256. [PMID: 30555679 DOI: 10.1039/c7tx00292k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 09/07/2018] [Indexed: 12/11/2022] Open
Abstract
Astaxanthin has been demonstrated to exhibit a wide range of beneficial effects that include anti-cancer and anti-inflammatory properties. Xeroderma pigmentosum complementation group C (XPC) protein is an important DNA damage recognition factor in nucleotide excision repair and is involved in regulating non-small cell lung cancer (NSCLC) cell proliferation and viability. Erlotinib (TarcevaR) is a selective epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor that has demonstrated clinical activity in NSCLC cells. However, whether astaxanthin and erlotinib could induce synergistic cytotoxicity in NSCLC cells through modulating XPC expression is unknown. In this study, we found that p38 MAPK activation by astaxanthin decreased XPC expression in two human lung adenocarcinoma A549 and H1975 cells. Inactivation of p38 MAPK by pharmacological inhibitor SB203580 or the specific small interfering RNA (siRNA) rescued the astaxanthin-reduced XPC mRNA and protein levels. Enforced expression of XPC cDNA or inhibiting the p38 MAPK activity reduced the cytotoxicity and cell growth inhibition of astaxanthin. In contrast, knockdown of XPC using siRNA enhanced the cytotoxic effects of astaxanthin. Moreover, astaxanthin synergistically enhanced cytotoxicity and cell growth inhibition of erlotinib in NSCLC cells, which were associated with the down-regulation of XPC expression and activation of p38 MAPK. Our findings suggested that the astaxanthin induced p38 MAPK mediated XPC down-regulation enhanced the erlotinib-induced cytotoxicity in A549 and H1975 cells.
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Affiliation(s)
- Jyh-Cheng Chen
- Department of Food Science , National Chiayi University , Chiayi , Taiwan
| | - Chia-Hung Wu
- Department of Biochemical Science and Technology , National Chiayi University , Chiayi , Taiwan . ; ; Tel: +886-5-271-7770
| | - Yi-Shuan Peng
- Department of Biochemical Science and Technology , National Chiayi University , Chiayi , Taiwan . ; ; Tel: +886-5-271-7770
| | - Hao-Yu Zheng
- Department of Biochemical Science and Technology , National Chiayi University , Chiayi , Taiwan . ; ; Tel: +886-5-271-7770
| | - Yuan-Cheng Lin
- Department of Biochemical Science and Technology , National Chiayi University , Chiayi , Taiwan . ; ; Tel: +886-5-271-7770
| | - Peng-Fang Ma
- Department of Biochemical Science and Technology , National Chiayi University , Chiayi , Taiwan . ; ; Tel: +886-5-271-7770
| | - Ting-Chuan Yen
- Department of Biochemical Science and Technology , National Chiayi University , Chiayi , Taiwan . ; ; Tel: +886-5-271-7770
| | - Tzu-Ying Chen
- Department of Biochemical Science and Technology , National Chiayi University , Chiayi , Taiwan . ; ; Tel: +886-5-271-7770
| | - Yun-Wei Lin
- Department of Biochemical Science and Technology , National Chiayi University , Chiayi , Taiwan . ; ; Tel: +886-5-271-7770
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15
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XPC is an RNA polymerase II cofactor recruiting ATAC to promoters by interacting with E2F1. Nat Commun 2018; 9:2610. [PMID: 29973595 PMCID: PMC6031651 DOI: 10.1038/s41467-018-05010-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 05/25/2018] [Indexed: 12/15/2022] Open
Abstract
The DNA damage sensor XPC is involved in nucleotide excision repair. Here we show that in the absence of damage, XPC co-localizes with RNA polymerase II (Pol II) and active post-translational histone modifications marks on a subset of class II promoters in human fibroblasts. XPC depletion triggers specific gene down-expression due to a drop in the deposition of histone H3K9 acetylation mark and pre-initiation complex formation. XPC interacts with the histone acetyltransferase KAT2A and specifically triggers the recruitment of the KAT2A-containing ATAC complex to the promoters of down-expressed genes. We show that a strong E2F1 signature characterizes the XPC/KAT2A-bound promoters and that XPC interacts with E2F1 and promotes its binding to its DNA element. Our data reveal that the DNA repair factor XPC is also an RNA polymerase II cofactor recruiting the ATAC coactivator complex to promoters by interacting with the DNA binding transcription factor E2F1. XPC plays an important role in the nuclear exicision repair pathways. Here the authors show that in addition, XPC plays a role in transcription regulation by interacting with KAT2A and E2F1 and recruiting the ATAC coactivator complex to promoters.
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16
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Bukowska B, Karwowski BT. Actual state of knowledge in the field of diseases related with defective nucleotide excision repair. Life Sci 2018; 195:6-18. [DOI: 10.1016/j.lfs.2017.12.035] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 12/19/2017] [Accepted: 12/24/2017] [Indexed: 12/11/2022]
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17
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Shah P, Qiang L, Yang S, Soltani K, He YY. Regulation of XPC deubiquitination by USP11 in repair of UV-induced DNA damage. Oncotarget 2017; 8:96522-96535. [PMID: 29228550 PMCID: PMC5722502 DOI: 10.18632/oncotarget.22105] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 10/13/2017] [Indexed: 12/31/2022] Open
Abstract
Nucleotide excision repair (NER) is the most versatile DNA repair pathway for removing DNA damage caused by UV radiation and many environmental carcinogens. NER is essential for suppressing tumorigenesis in the skin, lungs and brain. Although the core NER proteins have been identified and characterized, molecular regulation of NER remains poorly understood. Here we show that ubiquitin-specific peptidase 11 (USP11) positively regulates NER by deubiquitinating xeroderma pigmentosum complementation group C (XPC) and promoting its retention at the DNA damage sites. In addition, UV irradiation induces both USP11 recruitment to the chromatin and USP11 interaction with XPC in an XPC-ubiquitination-dependent manner. Furthermore, we found that USP11 is down-regulated in chronically UV-exposed mouse skin and in skin tumors from mice and humans. Our findings indicate that USP11 plays an important role in maintaining NER capacity, and suggest that USP11 acts as a tumor suppressor via its role in DNA repair.
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Affiliation(s)
- Palak Shah
- Department of Medicine, Section of Dermatology, University of Chicago, Chicago, IL, USA
- Committee on Molecular Pathogenesis and Molecular Medicine, University of Chicago, Chicago, IL, USA
| | - Lei Qiang
- Department of Medicine, Section of Dermatology, University of Chicago, Chicago, IL, USA
| | - Seungwon Yang
- Department of Medicine, Section of Dermatology, University of Chicago, Chicago, IL, USA
| | - Keyoumars Soltani
- Department of Medicine, Section of Dermatology, University of Chicago, Chicago, IL, USA
| | - Yu-Ying He
- Department of Medicine, Section of Dermatology, University of Chicago, Chicago, IL, USA
- Committee on Molecular Pathogenesis and Molecular Medicine, University of Chicago, Chicago, IL, USA
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18
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Zhou X, Cao B, Lu H. Negative auto-regulators trap p53 in their web. J Mol Cell Biol 2017; 9:62-68. [PMID: 28069666 PMCID: PMC5907828 DOI: 10.1093/jmcb/mjx001] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/14/2016] [Accepted: 01/06/2017] [Indexed: 01/07/2023] Open
Abstract
The transcriptional factor p53 activates the expression of a myriad of target genes involving a complicated signalling network, resulting in various cellular outcomes, such as growth arrest, senescence, apoptosis, and metabolic changes, and leading to consequent suppression of tumour growth and progression. Because of the profoundly adverse effect of p53 on growth and proliferation of cancer cells, several feedback mechanisms have been employed by the cells to constrain p53 activity. Two major antagonists MDM2 and MDMX (the long forms) are transcriptionally induced by p53, but in return block p53 activity, forming a negative feedback circuit and rendering chemoresistance of several cancer cells. However, they are not alone, as cancer cells also employ other proteins encoded by p53 target genes to inhibit p53 activity at transcriptional, translational, and posttranslational levels. This essay is thus composed to review a recent progress in understanding the mechanisms for how cancer cells hijack the p53 autoregulation by these proteins for their growth advantage and to discuss the clinical implications of these autoregulatory loops.
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Affiliation(s)
- Xiang Zhou
- Fudan University Shanghai Cancer Center and the Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Bo Cao
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA 70112, USA
| | - Hua Lu
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA 70112, USA
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19
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Cui T, Srivastava AK, Han C, Yang L, Zhao R, Zou N, Qu M, Duan W, Zhang X, Wang QE. XPC inhibits NSCLC cell proliferation and migration by enhancing E-Cadherin expression. Oncotarget 2016; 6:10060-72. [PMID: 25871391 PMCID: PMC4496340 DOI: 10.18632/oncotarget.3542] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2014] [Accepted: 02/13/2015] [Indexed: 02/07/2023] Open
Abstract
Xeroderma pigmentosum complementation group C (XPC) protein is an important DNA damage recognition factor in nucleotide excision repair. Deletion of XPC is associated with early stages of human lung carcinogenesis, and reduced XPC mRNA levels predict poor patient outcome for non-small cell lung cancer (NSCLC). However, the mechanisms linking loss of XPC expression and poor prognosis in lung cancer are still unclear. Here, we report evidence that XPC silencing drives proliferation and migration of NSCLC cells by down-regulating E-Cadherin. XPC knockdown enhanced proliferation and migration while decreasing E-Cadherin expression in NSCLC cells with an epithelial phenotype. Restoration of E-Cadherin in these cells suppressed XPC knockdown-induced cell growth both in vitro and in vivo. Mechanistic studies showed that the loss of XPC repressed E-Cadherin expression by activating the ERK pathway and upregulating Snail expression. Our findings indicate that XPC silencing-induced reduction of E-Cadherin expression contributes, at least in part, to the poor outcome of NSCLC patients with low XPC expression.
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Affiliation(s)
- Tiantian Cui
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Amit Kumar Srivastava
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Chunhua Han
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Linlin Yang
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Ran Zhao
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Ning Zou
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Meihua Qu
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Wenrui Duan
- Department of Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Xiaoli Zhang
- Center for Biostatistics, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Qi-En Wang
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
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20
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Puumalainen MR, Rüthemann P, Min JH, Naegeli H. Xeroderma pigmentosum group C sensor: unprecedented recognition strategy and tight spatiotemporal regulation. Cell Mol Life Sci 2016; 73:547-66. [PMID: 26521083 PMCID: PMC4713717 DOI: 10.1007/s00018-015-2075-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 10/14/2015] [Accepted: 10/15/2015] [Indexed: 12/14/2022]
Abstract
The cellular defense system known as global-genome nucleotide excision repair (GG-NER) safeguards genome stability by eliminating a plethora of structurally unrelated DNA adducts inflicted by chemical carcinogens, ultraviolet (UV) radiation or endogenous metabolic by-products. Xeroderma pigmentosum group C (XPC) protein provides the promiscuous damage sensor that initiates this versatile NER reaction through the sequential recruitment of DNA helicases and endonucleases, which in turn recognize and excise insulting base adducts. As a DNA damage sensor, XPC protein is very unique in that it (a) displays an extremely wide substrate range, (b) localizes DNA lesions by an entirely indirect readout strategy, (c) recruits not only NER factors but also multiple repair players, (d) interacts avidly with undamaged DNA, (e) also interrogates nucleosome-wrapped DNA irrespective of chromatin compaction and (f) additionally functions beyond repair as a co-activator of RNA polymerase II-mediated transcription. Many recent reports highlighted the complexity of a post-translational circuit that uses polypeptide modifiers to regulate the spatiotemporal activity of this multiuse sensor during the UV damage response in human skin. A newly emerging concept is that stringent regulation of the diverse XPC functions is needed to prioritize DNA repair while avoiding the futile processing of undamaged genes or silent genomic sequences.
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Affiliation(s)
- Marjo-Riitta Puumalainen
- Institute of Pharmacology and Toxicology, University of Zürich-Vetsuisse, 8057, Zurich, Switzerland
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden
| | - Peter Rüthemann
- Institute of Pharmacology and Toxicology, University of Zürich-Vetsuisse, 8057, Zurich, Switzerland
| | - Jun-Hyun Min
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, 60607, USA.
| | - Hanspeter Naegeli
- Institute of Pharmacology and Toxicology, University of Zürich-Vetsuisse, 8057, Zurich, Switzerland.
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21
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Pino LCDM, Balassiano LKDA, Sessim M, de Almeida APM, Empinotti VD, Semenovitch I, Treu C, Lupi O. Basal cell nevus syndrome: clinical and molecular review and case report. Int J Dermatol 2015; 55:367-75. [PMID: 26356331 DOI: 10.1111/ijd.12993] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Revised: 12/06/2014] [Accepted: 01/25/2015] [Indexed: 11/28/2022]
Abstract
Basal cell nevus syndrome (BCNS), also referred to as nevoid basal cell carcinoma syndrome or Gorlin-Goltz syndrome, was first described by Gorlin and Goltz in 1960 as an autosomal dominant disorder characterized by the early appearance of multiple basal cell carcinomas (BCCs), keratocysts of the jaw, ectopic calcifications, palmar and plantar pits, and anomalies of the ocular, skeletal, and reproductive systems. The genesis of this cancer's etiology in relation to BCNS was unclear until a few years ago when molecular analysis studies suggested a relationship between BCC and the loss-of-function mutations of the patched gene (PTCH) found on chromosome arm 9q. PTCH inhibits signaling by the membrane protein Smoothened (Smo), and this inhibition is relieved by binding sonic hedgehog (SHH) to PTCH. We describe a patient with multiple BCCs associated with x-ray anomalies of BCNS and review the basis of the SHH signaling pathway and clinical aspects of BCNS.
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Affiliation(s)
| | | | - Marlene Sessim
- Department of Dermatology, Policlínica Geral do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | | | | | - Ivan Semenovitch
- Department of Dermatology, Policlínica Geral do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Curt Treu
- Department of Dermatology, Policlínica Geral do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Omar Lupi
- Department of Dermatology, Policlínica Geral do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.,Department of Dermatology, Universidade Federal do Estado do Rio de Janeiro (Unirio), Rio de Janeiro, RJ, Brazil.,Department of Dermatology, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil
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22
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Genome Instability in Development and Aging: Insights from Nucleotide Excision Repair in Humans, Mice, and Worms. Biomolecules 2015; 5:1855-69. [PMID: 26287260 PMCID: PMC4598778 DOI: 10.3390/biom5031855] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 08/06/2015] [Accepted: 08/07/2015] [Indexed: 12/12/2022] Open
Abstract
DNA damage causally contributes to aging and cancer. Congenital defects in nucleotide excision repair (NER) lead to distinct cancer-prone and premature aging syndromes. The genetics of NER mutations have provided important insights into the distinct consequences of genome instability. Recent work in mice and C. elegans has shed new light on the mechanisms through which developing and aging animals respond to persistent DNA damage. The various NER mouse mutants have served as important disease models for Xeroderma pigmentosum (XP), Cockayne syndrome (CS), and trichothiodystrophy (TTD), while the traceable genetics of C. elegans have allowed the mechanistic delineation of the distinct outcomes of genome instability in metazoan development and aging. Intriguingly, highly conserved longevity assurance mechanisms respond to transcription-blocking DNA lesions in mammals as well as in worms and counteract the detrimental consequences of persistent DNA damage. The insulin-like growth factor signaling (IIS) effector transcription factor DAF-16 could indeed overcome DNA damage-driven developmental growth delay and functional deterioration even when DNA damage persists. Longevity assurance mechanisms might thus delay DNA damage-driven aging by raising the threshold when accumulating DNA damage becomes detrimental for physiological tissue functioning.
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23
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SUMO and ubiquitin-dependent XPC exchange drives nucleotide excision repair. Nat Commun 2015; 6:7499. [PMID: 26151477 PMCID: PMC4501428 DOI: 10.1038/ncomms8499] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Accepted: 05/15/2015] [Indexed: 02/07/2023] Open
Abstract
XPC recognizes UV-induced DNA lesions and initiates their removal by nucleotide excision repair (NER). Damage recognition in NER is tightly controlled by ubiquitin and SUMO modifications. Recent studies have shown that the SUMO-targeted ubiquitin ligase RNF111 promotes K63-linked ubiquitylation of SUMOylated XPC after DNA damage. However, the exact regulatory function of these modifications in vivo remains elusive. Here we show that RNF111 is required for efficient repair of ultraviolet-induced DNA lesions. RNF111-mediated ubiquitylation promotes the release of XPC from damaged DNA after NER initiation, and is needed for stable incorporation of the NER endonucleases XPG and ERCC1/XPF. Our data suggest that RNF111, together with the CRL4(DDB2) ubiquitin ligase complex, is responsible for sequential XPC ubiquitylation, which regulates the recruitment and release of XPC and is crucial for efficient progression of the NER reaction, thereby providing an extra layer of quality control of NER.
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24
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Functional and mechanistic studies of XPC DNA-repair complex as transcriptional coactivator in embryonic stem cells. Proc Natl Acad Sci U S A 2015; 112:E2317-26. [PMID: 25901318 DOI: 10.1073/pnas.1505569112] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The embryonic stem cell (ESC) state is transcriptionally controlled by OCT4, SOX2, and NANOG with cofactors, chromatin regulators, noncoding RNAs, and other effectors of signaling pathways. Uncovering components of these regulatory circuits and their interplay provides the knowledge base to deploy ESCs and induced pluripotent stem cells. We recently identified the DNA-repair complex xeroderma pigmentosum C (XPC)-RAD23B-CETN2 as a stem cell coactivator (SCC) required for OCT4/SOX2 transcriptional activation. Here we investigate the role of SCC genome-wide in murine ESCs by mapping regions bound by RAD23B and analyzing transcriptional profiles of SCC-depleted ESCs. We establish OCT4 and SOX2 as the primary transcription factors recruiting SCC to regulatory regions of pluripotency genes and identify the XPC subunit as essential for interaction with the two proteins. The present study reveals new mechanistic and functional aspects of SCC transcriptional activity, and thus underscores the diversified functions of this regulatory complex.
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25
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Sethi M, Lehmann AR, Fawcett H, Stefanini M, Jaspers N, Mullard K, Turner S, Robson A, McGibbon D, Sarkany R, Fassihi H. Patients with xeroderma pigmentosum complementation groups C, E and V do not have abnormal sunburn reactions. Br J Dermatol 2014; 169:1279-87. [PMID: 23889214 DOI: 10.1111/bjd.12523] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/17/2013] [Indexed: 01/08/2023]
Abstract
BACKGROUND Xeroderma pigmentosum (XP) is a rare autosomal recessive disorder of DNA repair. It is divided into eight complementation groups: XP-A to XP-G (classical XP) and XP variant (XP-V). Severe and prolonged sunburn reactions on minimal sun exposure have been considered a cardinal feature of classical XP. However, it has recently become clear that not all patients have abnormal sunburn reactions. OBJECTIVES To examine sunburn reactions in a cohort of patients with XP and correlate this to the complementation group. METHODS Sixty patients with XP attending the U.K. National XP Service from 2010 to 2012 were studied. Their history of burning after minimal sun exposure was assessed using a newly developed sunburn severity score. The age at which the first skin cancer was histologically diagnosed in each patient, and the presence of any neurological abnormality, was also recorded. RESULTS Sunburn severity scores were abnormally high in patients with XP-A, XP-D, XP-F and XP-G compared with non-XP controls. There was no significant difference in sunburn score of patients with XP-C, XP-E and XP-V compared with controls (P > 0·05). Patients with XP-C, XP-E and XP-V were more likely to have skin cancer diagnosed at an earlier age than those with severe sunburn on minimal sun exposure. In addition, patients with XP with severe sunburn had an increased frequency of neurological abnormalities. CONCLUSIONS Not all patients with XP have a history of severe and prolonged sunburn on minimal sun exposure. The normal sunburn response of patients with XP-C, XP-E and XP-V may relate to the preservation of transcription-coupled DNA repair in these groups. Those with a history of severe sunburn on minimal sun exposure developed their first skin cancer at an older age compared with patients with XP-C, XP-E and XP-V, but they had an increased frequency of neurological abnormalities. Physicians need to be aware that about half of all patients with XP will present without a history of abnormal sunburn.
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Affiliation(s)
- M Sethi
- UK National Xeroderma Pigmentosum Service, Department of Photodermatology, St John's Institute of Dermatology, Guy's and St Thomas' NHS Trust, London, U.K
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26
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Machado CR, Vieira-da-Rocha JP, Mendes IC, Rajão MA, Marcello L, Bitar M, Drummond MG, Grynberg P, Oliveira DAA, Marques C, Van Houten B, McCulloch R. Nucleotide excision repair in Trypanosoma brucei: specialization of transcription-coupled repair due to multigenic transcription. Mol Microbiol 2014; 92:756-76. [PMID: 24661334 PMCID: PMC4138998 DOI: 10.1111/mmi.12589] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/22/2014] [Indexed: 02/02/2023]
Abstract
Nucleotide excision repair (NER) is a highly conserved genome repair pathway acting on helix distorting DNA lesions. NER is divided into two subpathways: global genome NER (GG-NER), which is responsible for repair throughout genomes, and transcription-coupled NER (TC-NER), which acts on lesions that impede transcription. The extent of the Trypanosoma brucei genome that is transcribed is highly unusual, since most genes are organized in multigene transcription units, each transcribed from a single promoter. Given this transcription organization, we have addressed the importance of NER to T. brucei genome maintenance by performing RNAi against all predicted contributing factors. Our results indicate that TC-NER is the main pathway of NER repair, but only CSB, XPBz and XPG contribute. Moreover, we show that UV lesions are inefficiently repaired in T. brucei, perhaps due to preferential use of RNA polymerase translesion synthesis. RNAi of XPC and DDB was found to be lethal, and we show that these factors act in inter-strand cross-link repair. XPD and XPB appear only to act in transcription, not repair. This work indicates that the predominance of multigenic transcription in T. brucei has resulted in pronounced adaptation of NER relative to the host and may be an attractive drug target.
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Affiliation(s)
- Carlos R Machado
- Departamento de Bioquímica e Imunologia, ICB, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Caixa Postal 486, Belo Horizonte, 30161-970, MG, Brazil
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The C-terminal region of Xpc is dispensable for the transcriptional activity of Oct3/4 in mouse embryonic stem cells. FEBS Lett 2014; 588:1128-35. [PMID: 24607542 DOI: 10.1016/j.febslet.2014.02.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Revised: 02/08/2014] [Accepted: 02/14/2014] [Indexed: 12/18/2022]
Abstract
The transcription factor Oct3/4 is essential to maintain pluripotency in mouse embryonic stem (ES) cells. It was reported that the Xpc DNA repair complex is involved in this process. Here we examined the role of Xpc on the transcriptional activation of the target genes by Oct3/4 using the inducible knockout strategy. We found that the removal of the C-terminal region of Xpc, including the interaction sites with Rad23 and Cetn2, showed faint impact on the gene expression profile of ES cells and the functional Xpc-ΔC ES cell lines retained proper gene expression profile as well as pluripotency to contribute chimeric embryos. These data indicated that the C-terminal region of Xpc is dispensable for the transcriptional activity of Oct3/4 in mouse ES cells.
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28
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Poulsen SL, Hansen RK, Wagner SA, van Cuijk L, van Belle GJ, Streicher W, Wikström M, Choudhary C, Houtsmuller AB, Marteijn JA, Bekker-Jensen S, Mailand N. RNF111/Arkadia is a SUMO-targeted ubiquitin ligase that facilitates the DNA damage response. ACTA ACUST UNITED AC 2013; 201:797-807. [PMID: 23751493 PMCID: PMC3678163 DOI: 10.1083/jcb.201212075] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
RNF111/Arkadia targets SUMOylated XPC for ubiquitylation, negatively regulating its association with damaged DNA Protein modifications by ubiquitin and small ubiquitin-like modifier (SUMO) play key roles in cellular signaling pathways. SUMO-targeted ubiquitin ligases (STUbLs) directly couple these modifications by selectively recognizing SUMOylated target proteins through SUMO-interacting motifs (SIMs), promoting their K48-linked ubiquitylation and degradation. Only a single mammalian STUbL, RNF4, has been identified. We show that human RNF111/Arkadia is a new STUbL, which used three adjacent SIMs for specific recognition of poly-SUMO2/3 chains, and used Ubc13–Mms2 as a cognate E2 enzyme to promote nonproteolytic, K63-linked ubiquitylation of SUMOylated target proteins. We demonstrate that RNF111 promoted ubiquitylation of SUMOylated XPC (xeroderma pigmentosum C) protein, a central DNA damage recognition factor in nucleotide excision repair (NER) extensively regulated by ultraviolet (UV)-induced SUMOylation and ubiquitylation. Moreover, we show that RNF111 facilitated NER by regulating the recruitment of XPC to UV-damaged DNA. Our findings establish RNF111 as a new STUbL that directly links nonproteolytic ubiquitylation and SUMOylation in the DNA damage response.
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Affiliation(s)
- Sara L Poulsen
- Ubiquitin Signaling Group, Department of Disease Biology, The Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200 Copenhagen, Denmark
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Sepe S, Payan-Gomez C, Milanese C, Hoeijmakers JH, Mastroberardino PG. Nucleotide excision repair in chronic neurodegenerative diseases. DNA Repair (Amst) 2013; 12:568-77. [PMID: 23726220 DOI: 10.1016/j.dnarep.2013.04.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Impaired DNA repair involving the nucleotide excision repair (NER)/transcription-coupled repair (TCR) pathway cause human pathologies associated with severe neurological symptoms. These clinical observations suggest that defective NER/TCR might also play a critical role in chronic neurodegenerative disorders (ND), such as Alzheimer's and Parkinson's disease. Involvement of NER/TCR in these disorders is also substantiated by the evidence that aging constitutes the principal risk factor for chronic ND and that this DNA repair mechanism is very relevant for the aging process itself. Our understanding of the exact role of NER/TCR in chronic ND, however, is extremely rudimentary; while there is no doubt that defective NER/TCR can lead to neuronal death, evidence for its participation in the etiopathogenesis of ND is inconclusive thus far. Here we summarize the experimental observations supporting a role for NER/TCR in chronic ND and suggest questions and lines of investigation that might help in addressing this important issue. We also present a preliminary yet unprecedented meta-analysis on human brain microarray data to understand the expression levels of the various NER factors in the anatomical areas relevant for chronic ND pathogenesis. In summary, this review intends to highlight elements supporting a role of NER/TCR in these devastating disorders and to propose potential strategies of investigation.
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Affiliation(s)
- Sara Sepe
- Department of Genetics, Erasmus Medical Center, Rotterdam, The Netherlands
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30
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Brun J, Mahoney DJ, Le Boeuf F, Lefebvre C, Sanaei CA, Falls T, Mccart JA, Stojdl DF. Oncolytic Vaccinia virus safely and effectively treats skin tumors in mouse models of xeroderma pigmentosum. Int J Cancer 2012; 132:726-31. [PMID: 22733395 DOI: 10.1002/ijc.27695] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2011] [Revised: 03/30/2012] [Accepted: 06/01/2012] [Indexed: 11/07/2022]
Abstract
Xeroderma pigmentosum (XP) is an orphan autosomal recessive disorder of DNA repair. When exposed to genotoxic stress, XP patients have reduced capacity to remove bulky adducts by nucleotide excision repair and are thus greatly predisposed to cancer. Unfortunately, given the nature of their underlying genetic defect, tumor-bearing XP patients cannot be treated with conventional DNA damaging therapies. Engineered strains of the poxvirus Vaccinia have been shown to cure cancer in numerous preclinical models, and based on promising Phase I/II clinical trials have recently been approved for late phase evaluation in humans. As poxviruses are nongenotoxic, we investigated whether clinical-candidate strains of Vaccinia can safely and effectively treat cancers arising from XP. In vitro, Vaccinia virus was highly cytotoxic against tumor-derived cells from XP patients, on average 10- to 100-fold more so than on nontumor derived control cells from similar patients. In vivo, local or systemic administration of Vaccinia virus led to durable tumor resolution in both xenograft and genetic models of XP. Importantly, Vaccinia virus was well tolerated in the genetic models, which are each null for a critical component of the DNA repair process. Taken together, our data suggest that oncolytic Vaccinia virus may be a safe and effective therapy for cancers arising from XP, and raise the possibility of similar therapeutic potential against tumors that arise in patients with other DNA repair disorders.
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Affiliation(s)
- Jan Brun
- Apoptosis Research Centre, Children's Hospital of Eastern Ontario Research Institute, Ottawa, ON K1H 8L1, Canada
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31
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Liu Y, Chen Z, Wei Q, Yuan F, Zhi Y, Song B, Yang J. Poly (AT) polymorphism in the XPC gene and smoking enhance the risk of prostate cancer in a low-risk Chinese population. Cancer Genet 2012; 205:205-11. [PMID: 22682619 DOI: 10.1016/j.cancergen.2012.01.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Revised: 01/11/2012] [Accepted: 01/28/2012] [Indexed: 11/15/2022]
Abstract
We investigated two polymorphisms of xeroderma pigmentosum complementary group C (XPC) in 202 subjects with prostate cancer (PCa) and 221 healthy controls in a Chinese Han population. Genotyping was performed using a polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) technique. Our results indicated that smoking is associated with an increased risk for PCa (odds ratio [OR]: 1.51; 95% confidence interval [CI]: 1.02-2.22). Subjects carrying the XPC-PAT+/+ genotype exhibited a significantly increased risk for PCa (OR: 2.11; 95% CI: 1.12-3.99). The combined subjects with either the PAT+/+ or PAT+/- genotype also exhibited a 1.54-fold increased risk associated with PCa (OR: 1.54; 95% CI: 1.04-2.26). Moreover, smokers with PAT+/- or PAT+/+ had a higher risk for PCa (OR: 1.98; 95% CI: 1.08-3.64; P = 0.026 and OR: 3.56; 95% CI: 1.45-8.76; P = 0.004, respectively) compared with never smokers with the PAT-/- genotype. Analyses of the XPC Lys939Gln polymorphism did not show an association with PCa risk. Our findings support the hypothesis that XPC-PAT polymorphisms may contribute to the risk of developing PCa. More important, an elevated risk of PCa associated with a gene-environment (smoking) interaction was determined in a Chinese population.
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Affiliation(s)
- Yang Liu
- Urology Institute of PLA, Southwest Cancer Center, Southwest Hospital, Chongqing, China
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32
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Kamileri I, Karakasilioti I, Garinis GA. Nucleotide excision repair: new tricks with old bricks. Trends Genet 2012; 28:566-73. [PMID: 22824526 DOI: 10.1016/j.tig.2012.06.004] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 06/05/2012] [Accepted: 06/19/2012] [Indexed: 12/22/2022]
Abstract
Nucleotide excision repair (NER) is a major DNA repair pathway that ensures that the genome remains functionally intact and is faithfully transmitted to progeny. However, defects in NER lead, in addition to cancer and aging, to developmental abnormalities whose clinical heterogeneity and varying severity cannot be fully explained by the DNA repair deficiencies. Recent work has revealed that proteins in NER play distinct roles, including some that go well beyond DNA repair. NER factors are components of protein complexes known to be involved in nucleosome remodeling, histone ubiquitination, and transcriptional activation of genes involved in nuclear receptor signaling, stem cell reprogramming, and postnatal mammalian growth. Together, these findings add new pieces to the puzzle for understanding NER and the relevance of NER defects in development and disease.
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Affiliation(s)
- Irene Kamileri
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Nikolaou Plastira 100, 70013, Heraklion, Crete, Greece
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33
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Bergink S, Toussaint W, Luijsterburg MS, Dinant C, Alekseev S, Hoeijmakers JHJ, Dantuma NP, Houtsmuller AB, Vermeulen W. Recognition of DNA damage by XPC coincides with disruption of the XPC-RAD23 complex. ACTA ACUST UNITED AC 2012; 196:681-8. [PMID: 22431748 PMCID: PMC3308700 DOI: 10.1083/jcb.201107050] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The recognition of helix-distorting deoxyribonucleic acid (DNA) lesions by the global genome nucleotide excision repair subpathway is performed by the XPC-RAD23-CEN2 complex. Although it has been established that Rad23 homologs are essential to protect XPC from proteasomal degradation, it is unclear whether RAD23 proteins have a direct role in the recognition of DNA damage. In this paper, we show that the association of XPC with ultraviolet-induced lesions was impaired in the absence of RAD23 proteins. Furthermore, we show that RAD23 proteins rapidly dissociated from XPC upon binding to damaged DNA. Our data suggest that RAD23 proteins facilitate lesion recognition by XPC but do not participate in the downstream DNA repair process.
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Affiliation(s)
- Steven Bergink
- Department of Genetics, Josephine Nefkens Institute, Erasmus Medical Center, 3015 GE Rotterdam, Netherlands
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Dysmyelination not demyelination causes neurological symptoms in preweaned mice in a murine model of Cockayne syndrome. Proc Natl Acad Sci U S A 2012; 109:4627-32. [PMID: 22393014 DOI: 10.1073/pnas.1202621109] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Cockayne syndrome (CS) is a rare autosomal recessive neurodegenerative disease that is associated with mutations in either of two transcription-coupled DNA repair genes, CSA or CSB. Mice with a targeted mutation in the Csb gene (Cs-b(m/m)) exhibit a milder phenotype compared with human patients with mutations in the orthologous CSB gene. Mice mutated in Csb were crossed with mice lacking Xpc (Xp-c(-/-)), the global genome repair gene, to enhance the pathological symptoms. These Cs-b(m/m).Xp-c(-/-) mice were normal at birth but exhibited progressive failure to thrive, whole-body wasting, and ataxia and died at approximately postnatal day 21. Characterization of Cs-b(m/m).Xp-c(-/-) brains at postnatal stages demonstrated widespread reduction of myelin basic protein (MBP) and myelin in the sensorimotor cortex, the stratum radiatum, the corpus callosum, and the anterior commissure. Quantification of individual axons by electron microscopy showed a reduction in both the number of myelinated axons and the average diameter of myelin surrounding the axons. There were no significant differences in proliferation or oligodendrocyte differentiation between Cs-b(m/m).Xp-c(-/-) and Cs-b(m/+).Xp-c(-/-) mice. Rather, Cs-b(m/m).Xp-c(-/-) oligodendrocytes were unable to generate sufficient MBP or to maintain the proper myelination during early development. Csb is a multifunctional protein regulating both repair and the transcriptional response to reactive oxygen through its interaction with histone acetylase p300 and the hypoxia-inducible factor (HIF)1 pathway. On the basis of our results, combined with that of others, we suggest that in Csb the transcriptional response predominates during early development, whereas a neurodegenerative response associated with repair deficits predominates in later life.
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Abstract
Xeroderma pigmentosum (XP) is a rare, autosomal recessive disorder of DNA repair characterized by sun sensitivity and UV radiation-induced skin and mucous membrane cancers. Initially described in 1874 by Moriz Kaposi in Vienna, nearly 100 years later, James Cleaver in San Francisco reported defective DNA repair in XP cells. This eventually provided the basis for a mechanistic link between sun exposure, DNA damage, somatic mutations, and skin cancer. XP cells were found to have defects in seven of the proteins of the nucleotide excision repair pathway and in DNA polymerase η. XP cells are hypersensitive to killing by UV radiation, and XP cancers have characteristic "UV signature" mutations. Clinical studies at the National Institutes of Health found a nearly 10,000-fold increase in skin cancer in XP patients under the age of 20 years, demonstrating the substantial importance of DNA repair in cancer prevention in the general population. Approximately 25% of XP patients have progressive neurological degeneration with progressive loss of neurons, probably from DNA damage induced by oxidative metabolism, which kills nondividing cells in the nervous system. Interestingly, patients with another disorder, trichothiodystrophy, have defects in some of the same genes as XP, but they have primary developmental abnormalities without an increase in skin cancer.
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Affiliation(s)
- John J DiGiovanna
- DNA Repair Section, Dermatology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892-4258, USA
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36
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Wang QE, Han C, Zhang B, Sabapathy K, Wani AA. Nucleotide excision repair factor XPC enhances DNA damage-induced apoptosis by downregulating the antiapoptotic short isoform of caspase-2. Cancer Res 2011; 72:666-75. [PMID: 22174370 DOI: 10.1158/0008-5472.can-11-2774] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
XPC protein is a critical DNA damage recognition factor in nucleotide excision repair for which genetic deficiency confers a predisposition to cancer. In this study, we show that XPC has a function that is independent of its canonical function in DNA repair, potentially altering the interpretation of how XPC deficiency leads to heightened cancer susceptibility. XPC enhances apoptosis induced by DNA damage in a p53 nullizygous background, acting downstream of mitochondrial permeabilization and upstream of caspase-9 activation in the DNA damage-induced apoptosis cascade. We found that deficiency in XPC upregulated production of the short isoform of caspase-2 (casp-2S). This upregulation occurred at both protein and mRNA levels through repression of the caspase-2 promoter by XPC protein. Targeted RNAi-mediated downregulation of casp-2S-enhanced UV-induced apoptosis as well as activation of caspase-9 and caspase-6 in XPC-deficient cells, but not in XPC-proficient cells. In addition, XPC overexpression in various p53-deficient cancer cells resistant to cisplatin improved their sensitivity to cisplatin-induced apoptosis. Given that casp-2S functions as an antiapoptotic protein, our findings suggest that XPC enhances DNA damage-induced apoptosis through inhibition of casp-2S transcription. Together, these findings offer a mechanistic foundation to overcome the resistance of highly prevalent p53-deficient tumors to cell death induced by DNA-damaging therapeutic agents, by targeting strategies that inhibit the expression or function of casp-2S.
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Affiliation(s)
- Qi-En Wang
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210, USA.
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37
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Fong YW, Inouye C, Yamaguchi T, Cattoglio C, Grubisic I, Tjian R. A DNA repair complex functions as an Oct4/Sox2 coactivator in embryonic stem cells. Cell 2011; 147:120-31. [PMID: 21962512 DOI: 10.1016/j.cell.2011.08.038] [Citation(s) in RCA: 133] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Revised: 08/23/2011] [Accepted: 08/25/2011] [Indexed: 01/06/2023]
Abstract
The transcriptional activators Oct4, Sox2, and Nanog cooperate with a wide array of cofactors to orchestrate an embryonic stem (ES) cell-specific gene expression program that forms the molecular basis of pluripotency. Here, we report using an unbiased in vitro transcription-biochemical complementation assay to discover a multisubunit stem cell coactivator complex (SCC) that is selectively required for the synergistic activation of the Nanog gene by Oct4 and Sox2. Purification, identification, and reconstitution of SCC revealed this coactivator to be the trimeric XPC-nucleotide excision repair complex. SCC interacts directly with Oct4 and Sox2 and is recruited to the Nanog and Oct4 promoters as well as a majority of genomic regions that are occupied by Oct4 and Sox2. Depletion of SCC/XPC compromised both pluripotency in ES cells and somatic cell reprogramming of fibroblasts to induced pluripotent stem (iPS) cells. This study identifies a transcriptional coactivator with diversified functions in maintaining ES cell pluripotency and safeguarding genome integrity.
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Affiliation(s)
- Yick W Fong
- Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA
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38
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Pascucci B, D'Errico M, Parlanti E, Giovannini S, Dogliotti E. Role of nucleotide excision repair proteins in oxidative DNA damage repair: an updating. BIOCHEMISTRY (MOSCOW) 2011; 76:4-15. [PMID: 21568835 DOI: 10.1134/s0006297911010032] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
DNA repair is a crucial factor in maintaining a low steady-state level of oxidative DNA damage. Base excision repair (BER) has an important role in preventing the deleterious effects of oxidative DNA damage, but recent evidence points to the involvement of several repair pathways in this process. Oxidative damage may arise from endogenous and exogenous sources and may target nuclear and mitochondrial DNA as well as RNA and proteins. The importance of preventing mutations associated with oxidative damage is shown by a direct association between defects in BER (i.e. MYH DNA glycosylase) and colorectal cancer, but it is becoming increasingly evident that damage by highly reactive oxygen species plays also central roles in aging and neurodegeneration. Mutations in genes of the nucleotide excision repair (NER) pathway are associated with diseases, such as xeroderma pigmentosum and Cockayne syndrome, that involve increased skin cancer and/or developmental and neurological symptoms. In this review we will provide an updating of the current evidence on the involvement of NER factors in the control of oxidative DNA damage and will attempt to address the issue of whether this unexpected role may unlock the difficult puzzle of the pathogenesis of these syndromes.
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Affiliation(s)
- B Pascucci
- Istituto di Cristallografia, Consiglio Nazionale delle Ricerche, Monterotondo Stazione, Rome, Italy.
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39
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Protection from UV-induced skin carcinogenesis by genetic inhibition of the ataxia telangiectasia and Rad3-related (ATR) kinase. Proc Natl Acad Sci U S A 2011; 108:13716-21. [PMID: 21844338 DOI: 10.1073/pnas.1111378108] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Multiple human epidemiologic studies link caffeinated (but not decaffeinated) beverage intake with significant decreases in several types of cancer, including highly prevalent UV-associated skin carcinomas. The mechanism by which caffeine protects against skin cancer is unknown. Ataxia telangiectasia and Rad3-related (ATR) is a replication checkpoint kinase activated by DNA stresses and is one of several targets of caffeine. Suppression of ATR, or its downstream target checkpoint kinase 1 (Chk1), selectively sensitizes DNA-damaged and malignant cells to apoptosis. Agents that target this pathway are currently in clinical trials. Conversely, inhibition of other DNA damage response pathways, such as ataxia telangiectasia mutated (ATM) and BRCA1, promotes cancer. To determine the effect of replication checkpoint inhibition on carcinogenesis, we generated transgenic mice with diminished ATR function in skin and crossed them into a UV-sensitive background, Xpc(-/-). Unlike caffeine, this genetic approach was selective and had no effect on ATM activation. These transgenic mice were viable and showed no histological abnormalities in skin. Primary keratinocytes from these mice had diminished UV-induced Chk1 phosphorylation and twofold augmentation of apoptosis after UV exposure (P = 0.006). With chronic UV treatment, transgenic mice remained tumor-free for significantly longer (P = 0.003) and had 69% fewer tumors at the end of observation of the full cohort (P = 0.019), compared with littermate controls with the same genetic background. This study suggests that inhibition of replication checkpoint function can suppress skin carcinogenesis and supports ATR inhibition as the relevant mechanism for the protective effect of caffeinated beverage intake in human epidemiologic studies.
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The role of XPC: implications in cancer and oxidative DNA damage. Mutat Res 2011; 728:107-17. [PMID: 21763452 DOI: 10.1016/j.mrrev.2011.07.001] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Revised: 06/30/2011] [Accepted: 07/01/2011] [Indexed: 01/14/2023]
Abstract
The accumulation of DNA damage is a slow but hazardous phenomenon that may lead to cell death, accelerated aging features and cancer. One of the most versatile and important defense mechanisms against the accumulation of DNA damage is nucleotide excision repair (NER), in which the Xeroderma pigmentosum group C (XPC) protein plays a prominent role. NER can be divided into global genome repair (GG-NER) and transcription coupled repair (TC-NER). XPC is a key factor in GG-NER where it functions in DNA damage recognition and after which the repair machinery is recruited to eliminate the DNA damage. Defective XPC functioning has been shown to result in a cancer prone phenotype, in human as well as in mice. Mutation accumulation in XPC deficient mice is accelerated and increased, resulting in an increased tumor incidence. More recently XPC has also been linked to functions outside of NER since XPC deficient mice show a divergent tumor spectrum compared to other NER deficient mouse models. Multiple in vivo and in vitro experiments indicate that XPC appears to be involved in the initiation of several DNA damage-induced cellular responses. XPC seems to function in the removal of oxidative DNA damage, redox homeostasis and cell cycle control. We hypothesize that this combination of increased oxidative DNA damage sensitivity, disturbed redox homeostasis together with inefficient cell cycle control mechanisms are causes of the observed increased cancer susceptibility in oxygen exposed tissues. Such a phenotype is absent in other NER-deficient mice, including Xpa.
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Martínez P, Blasco MA. Telomeric and extra-telomeric roles for telomerase and the telomere-binding proteins. Nat Rev Cancer 2011; 11:161-76. [PMID: 21346783 DOI: 10.1038/nrc3025] [Citation(s) in RCA: 375] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Mammalian telomeres are formed by tandem repeats of the TTAGGG sequence, which are progressively lost with each round of cell division. Telomere protection requires a minimal length of TTAGGG repeats to allow the binding of shelterin, which prevents the activation of a DNA damage response (DDR) at chromosome ends. Telomere elongation is carried out by telomerase. Telomerase can also act as a transcriptional modulator of the Wnt-β-catenin signalling pathway and has RNA-dependent RNA polymerase activity. Dysfunctional telomeres can lead to either cancer or ageing pathologies depending on the integrity of the DDR. This Review discusses the role of telomeric proteins in cancer and ageing through modulating telomere length and protection, as well as regulating gene expression by binding to non-telomeric sites.
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Affiliation(s)
- Paula Martínez
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid E-28029, Spain
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42
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Wu YH, Wu TC, Liao JW, Yeh KT, Chen CY, Lee H. p53 Dysfunction by Xeroderma Pigmentosum Group C Defects Enhance Lung Adenocarcinoma Metastasis via Increased Mmp1 Expression. Cancer Res 2010; 70:10422-32. [PMID: 21056989 DOI: 10.1158/0008-5472.can-10-2615] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Yi-Hui Wu
- Division of Environmental Health and Occupational Medicine, National Health Research Institutes, Miaoli, Taiwan, Republic of China
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Microarray analysis of microRNA expression in skin of Xpc⁺/⁻ mice and wild-type mice. Ir J Med Sci 2010; 180:721-6. [PMID: 20976628 DOI: 10.1007/s11845-010-0609-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2010] [Accepted: 09/18/2010] [Indexed: 12/27/2022]
Abstract
BACKGROUND AND AIM MicroRNAs (miRNAs) are noncoding RNA molecules of 21-24 nt that regulate the expression of target genes in a post-transcriptional manner. Evidence indicates that miRNAs play essential roles in embryogenesis, cell differentiation, and pathogenesis of human diseases including skin cancer. To investigate possible mechanisms of photocarcinogenesis, we describe a comparison between miRNA expression profile of Xpc heterozygous partially repair-deficient mice and WT repair-proficient mice. METHODS We analyzed the miRNA expression profiles in 2 pairs of Xpc(+/-) mice and WT mice, using a mammalian miRNA microarray containing whole mice mature and precursor miRNA sequences. MiRBase and GO analysis were employed for the prediction of miRNA targets. RESULTS A total of 20 miRNAs were differentially expressed in which 13 miRNAs down-regulated and 7 miRNAs up-regulated in Xpc heterozygous mice compared with the WT counterpart. Differentially expressed miRNAs were predicted to have some relationships with several signaling pathway in skin cells, of which regulation of epidermal growth factor receptor signaling pathway and transforming growth factor beta receptor signaling pathway should be noted. CONCLUSION The differential miRNA expression identified in this study may be of use in the diagnosis and/or treatment of UV-induced skin cancers.
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Abstract
Mammalian telomeres are formed by tandem repeats of the TTAGGG sequence bound by a specialized six-protein complex known as shelterin, which has fundamental roles in the regulation of telomere length and telomere capping. In the past, the study of mice genetically modified for telomerase components has been instrumental to demonstrate the role of telomere length in cancer and aging. Recent studies using genetically modified mice for shelterin proteins have highlighted an equally important role of telomere-bound proteins in cancer and aging, even in the presence of proficient telomerase activity and normal telomere length. In this review, we will focus on recent findings, suggesting a role of shelterin components in cancer and aging.
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45
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Selfridge J, Song L, Brownstein DG, Melton DW. Mice with DNA repair gene Ercc1 deficiency in a neural crest lineage are a model for late-onset Hirschsprung disease. DNA Repair (Amst) 2010; 9:653-60. [PMID: 20362516 DOI: 10.1016/j.dnarep.2010.02.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2009] [Revised: 02/18/2010] [Accepted: 02/25/2010] [Indexed: 11/28/2022]
Abstract
The Ercc1 gene is essential for nucleotide excision repair and is also important in recombination repair and the repair of interstrand crosslinks. We have previously used a floxed Ercc1 allele with a keratinocyte-specific Cre recombinase transgene to inactivate Ercc1 in the epidermal layer of the skin and so generate a mouse model for UV-induced non-melanoma skin cancer. Now, in an attempt to generate a model for UV-induced melanoma, we have used the floxed Ercc1 allele in combination with a Cre transgene under the control of the tyrosinase gene promoter to produce mice with Ercc1-deficient melanocytes that are hypersensitive to UV irradiation. These animals developed normally, but died when 4-6 months old with severe colonic obstruction. Melanocytes are derived from the neural crest and the tyrosinase promoter is also expressed in additional neural crest-derived lineages, including the progenitors of the parasympathetic nervous system that innervates the gastrointestinal tract and controls gut peristalsis. A functional enteric nervous system developed in floxed Ercc1 mice with the tyrosinase Cre transgene, but was found to have degenerated in the colons of affected mice. We suggest that accumulating unrepaired endogenous DNA damage in the Ercc1-deficient colonic parasympathetic ganglia leads to the degeneration of this network and results in a colonic obstructive disorder that resembles late-onset Hirschsprung disease in man.
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Affiliation(s)
- Jim Selfridge
- Wellcome Trust Centre for Cell Biology, University of Edinburgh, Michael Swann Building, Mayfield Road, Edinburgh EH9 3JR, UK
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46
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Abstract
The rising incidence and morbidity of non-melanoma skin cancers has generated great interest in unravelling of their pathogenesis and in the search for new non-invasive treatments. Whereas the role of cumulative sun exposure in pathogenesis of squamous-cell carcinoma seems clear, the relation between sun-exposure patterns and subtypes of basal-cell carcinoma remains undetermined. Several complex genotypic, phenotypic, and environmental factors contribute to pathogenesis of non-melanoma skin cancers. Unlike basal-cell carcinoma, squamous-cell carcinomas can arise from precursor lesions. Diagnosis of non-melanoma skin cancer is made clinically and confirmed by histological testing. Prognosis depends on lesion and host characteristics, which also dictate choice of treatment. Prevention strategies aim at reduction of sun exposure, but are of unproven benefit, especially for basal-cell carcinoma. Surgical excision with predetermined margins is the mainstay of treatment for squamous-cell carcinoma and for most basal-cell carcinomas. Of the new non-invasive treatments, only photodynamic therapy and topical imiquimod have become established treatments for specific subtypes of basal-cell carcinoma, and the search for more effective and tissue-salvaging therapies continues.
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Affiliation(s)
- Vishal Madan
- Dermatology Centre, Salford Royal Hospital NHS Foundation Trust, Salford, UK
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47
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Malik S, Chaurasia P, Lahudkar S, Durairaj G, Shukla A, Bhaumik SR. Rad26p, a transcription-coupled repair factor, is recruited to the site of DNA lesion in an elongating RNA polymerase II-dependent manner in vivo. Nucleic Acids Res 2009; 38:1461-77. [PMID: 20007604 PMCID: PMC2836574 DOI: 10.1093/nar/gkp1147] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Rad26p, a yeast homologue of human Cockayne syndrome B with an ATPase activity, plays a pivotal role in stimulating DNA repair at the coding sequences of active genes. On the other hand, DNA repair at inactive genes or silent areas of the genome is not regulated by Rad26p. However, how Rad26p recognizes DNA lesions at the actively transcribing genes to facilitate DNA repair is not clearly understood in vivo. Here, we show that Rad26p associates with the coding sequences of genes in a transcription-dependent manner, but independently of DNA lesions induced by 4-nitroquinoline-1-oxide in Saccharomyces cerevisiae. Further, histone H3 lysine 36 methylation that occurs at the active coding sequence stimulates the recruitment of Rad26p. Intriguingly, we find that Rad26p is recruited to the site of DNA lesion in an elongating RNA polymerase II-dependent manner. However, Rad26p does not recognize DNA lesions in the absence of active transcription. Together, these results provide an important insight as to how Rad26p is delivered to the damage sites at the active, but not inactive, genes to stimulate repair in vivo, shedding much light on the early steps of transcription-coupled repair in living eukaryotic cells.
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Affiliation(s)
- Shivani Malik
- Department of Biochemistry and Molecular Biology, Southern Illinois University School of Medicine, 1245 Lincoln Drive, Carbondale, IL-62901, USA
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48
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XPC gene variants: a risk factor for recurrence of urothelial bladder carcinoma in patients on BCG immunotherapy. J Cancer Res Clin Oncol 2009; 136:779-86. [DOI: 10.1007/s00432-009-0717-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2008] [Accepted: 10/19/2009] [Indexed: 10/20/2022]
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49
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Uehara Y, Ikehata H, Furuya M, Kobayashi S, He D, Chen Y, Komura JI, Ohtani H, Shimokawa I, Ono T. XPC is involved in genome maintenance through multiple pathways in different tissues. Mutat Res 2009; 670:24-31. [PMID: 19615386 DOI: 10.1016/j.mrfmmm.2009.06.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 06/26/2009] [Accepted: 06/30/2009] [Indexed: 05/28/2023]
Abstract
In an attempt to evaluate the role of the Xpc gene in maintaining genomic stability in vivo under normal conditions, the age-dependent accumulation of spontaneous mutations in different tissues was analyzed in Xpc-deficient lacZ-transgenic mice. Brain, testis, and small intestine revealed no effects from the Xpc-deficiency, whereas liver, spleen, heart, and lung showed an enhanced age-related accumulation of mutations in Xpc-deficient mice. In the spleen, the effect was not obvious at 2 and 12 months of age, but became apparent at 23 months. The magnitude of the observed effect at an advanced age was similar in the liver, spleen and heart, but was comparatively smaller in the lung. Haploinsufficiency was observed in liver and spleen but not in heart and lung. Analysis of DNA sequences in the mutants revealed that the frequency of G:C to T:A changes were elevated in the liver and heart of Xpc-deficient aged mice, supporting the possible involvement of XPC in base excision repair of oxidized guanine. The occurrence of two or more mutations within a single lacZ gene was termed a multiple mutation and was also elevated in old Xpc-deficient mice. Among the clones examined, two mutant clones showed as many as four mutations within a short stretch of DNA. This is the first demonstration to support suggestions for the existence of a role for XPC in the suppression of multiple mutations. These multiple mutations could conceivably be generated by error-prone trans-lesional DNA synthesis. Overall, these results indicate that there may be diverse roles or mechanisms through which XPC participates in genome maintenance in different tissues.
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Affiliation(s)
- Yoshihiko Uehara
- Department of Cell Biology, Graduate School of Medicine, Tohoku University, Sendai, Japan
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50
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Zattra E, Coleman C, Arad S, Helms E, Levine D, Bord E, Guillaume A, El-Hajahmad M, Zwart E, van Steeg H, Gonzalez S, Kishore R, Goukassian DA. Polypodium leucotomos extract decreases UV-induced Cox-2 expression and inflammation, enhances DNA repair, and decreases mutagenesis in hairless mice. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 175:1952-61. [PMID: 19808641 DOI: 10.2353/ajpath.2009.090351] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
UV-irradiated skin and UV-induced tumors overexpress the inducible isoform of cyclooxygenase-2 (Cox-2), and Cox-2 inhibition reduces photocarcinogenesis. To evaluate photoprotective effects of Polypodium leucotomos extract (PL), hairless Xpc(+/-) mice were fed for 10 days with PL (300 mg/kg) or vehicle then UV-irradiated, once. By 24 hours, UV-induced Cox-2 levels were increased in vehicle-fed and PL-fed mice, whereas by 48 and 72 hours, Cox-2 levels were four- to fivefold lower in PL-fed mice (P < 0.05). p53 expression/activity was increased in PL-fed versus vehicle-fed then UV-irradiated mice. UV-induced inflammation was decreased in PL-fed mice, as shown by approximately 60% decrease (P < 0.001) in neutrophil infiltration at 24 hours, and macrophages by approximately 50% (<0.02) at 24 and 48 hours. By 72 hours, 54 +/- 5% cyclobutane pyrimidine dimers remained in vehicle-fed versus 31 +/- 5% in PL-fed skin (P < 0.003). The number of 8-hydroxy-2'-deoxyguanosine-positive cells were decreased before UV irradiation by approximately 36% (P < 0.01), suggesting that PL reduces constitutive oxidative DNA damage. By 6 and 24 hours, the number of 8-hydroxy-2'-deoxyguanosine-positive cells were approximately 59% (P < 0.01) and approximately 79% (P < 0.03) lower in PL-fed versus vehicle-fed mice. Finally, UV-induced mutations in PL-fed-mice were decreased by approximately 25% when assessed 2 weeks after the single UV exposure. These data demonstrate that PL extract supplementation affords the following photoprotective effects: p53 activation and reduction of acute inflammation via Cox-2 enzyme inhibition, increased cyclobutane pyrimidine dimer removal, and reduction of oxidative DNA damage.
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Affiliation(s)
- Edoardo Zattra
- Department of Dermatology, Boston University School of Medicine, MA 02118, USA
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