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Jacczak B, Rubiś B, Totoń E. Potential of Naturally Derived Compounds in Telomerase and Telomere Modulation in Skin Senescence and Aging. Int J Mol Sci 2021; 22:6381. [PMID: 34203694 PMCID: PMC8232155 DOI: 10.3390/ijms22126381] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 05/26/2021] [Accepted: 06/07/2021] [Indexed: 12/14/2022] Open
Abstract
Proper functioning of cells-their ability to divide, differentiate, and regenerate-is dictated by genomic stability. The main factors contributing to this stability are the telomeric ends that cap chromosomes. Telomere biology and telomerase activity have been of interest to scientists in various medical science fields for years, including the study of both cancer and of senescence and aging. All these processes are accompanied by telomere-length modulation. Maintaining the key levels of telomerase component (hTERT) expression and telomerase activity that provide optimal telomere length as well as some nontelomeric functions represents a promising step in advanced anti-aging strategies, especially in dermocosmetics. Some known naturally derived compounds contribute significantly to telomere and telomerase metabolism. However, before they can be safely used, it is necessary to assess their mechanisms of action and potential side effects. This paper focuses on the metabolic potential of natural compounds to modulate telomerase and telomere biology and thus prevent senescence and skin aging.
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Affiliation(s)
| | | | - Ewa Totoń
- Department of Clinical Chemistry and Molecular Diagnostics, Poznan University of Medical Sciences, 49 Przybyszewskiego St., 60-355 Poznań, Poland; (B.J.); (B.R.)
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Molès JP, Griez A, Guilhou JJ, Girard C, Nagot N, Van de Perre P, Dujols P. Cytosolic RNA:DNA Duplexes Generated by Endogenous Reverse Transcriptase Activity as Autonomous Inducers of Skin Inflammation in Psoriasis. PLoS One 2017; 12:e0169879. [PMID: 28095445 PMCID: PMC5240966 DOI: 10.1371/journal.pone.0169879] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 12/23/2016] [Indexed: 11/22/2022] Open
Abstract
Psoriasis is a chronic skin disease of unknown ætiology. Recent studies suggested that a large amount of cytosolic DNA (cyDNA) in keratinocytes is breaking keratinocytes DNA tolerance and promotes self-sustained inflammation in the psoriatic lesion. We investigated the origin of this cyDNA. We show that, amongst all the possible DNA structures, the cyDNA could be present as RNA:DNA duplexes in keratinocytes. We further show that endogenous reverse transcriptase activities generate such duplexes and consequently activate the production of Th1-inflammatory cytokines. These observations open a new research avenue related to endogenous retroelements for the aetiology of psoriasis and probably of other human chronic inflammatory diseases.
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Affiliation(s)
- Jean-Pierre Molès
- Inserm UMR 1058, Montpellier, France
- Etablissement Français du Sang, Montpellier, France
- University of Montpellier, Montpellier, France
| | - Anthony Griez
- Inserm UMR 1058, Montpellier, France
- Etablissement Français du Sang, Montpellier, France
- University of Montpellier, Montpellier, France
| | - Jean-Jacques Guilhou
- University of Montpellier, Montpellier, France
- CHU of Montpellier, Montpellier, France
| | - Céline Girard
- Inserm UMR 1058, Montpellier, France
- Etablissement Français du Sang, Montpellier, France
- University of Montpellier, Montpellier, France
- CHU of Montpellier, Montpellier, France
| | - Nicolas Nagot
- Inserm UMR 1058, Montpellier, France
- Etablissement Français du Sang, Montpellier, France
- University of Montpellier, Montpellier, France
- CHU of Montpellier, Montpellier, France
| | - Philippe Van de Perre
- Inserm UMR 1058, Montpellier, France
- Etablissement Français du Sang, Montpellier, France
- University of Montpellier, Montpellier, France
- CHU of Montpellier, Montpellier, France
| | - Pierre Dujols
- Inserm UMR 1058, Montpellier, France
- Etablissement Français du Sang, Montpellier, France
- University of Montpellier, Montpellier, France
- CHU of Montpellier, Montpellier, France
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Guo W, Lu J, Dai M, Wu T, Yu Z, Wang J, Chen W, Shi D, Yu W, Xiao Y, Yi C, Tang Z, Xu T, Xiao X, Yuan Y, Liu Q, Du G, Deng W. Transcriptional coactivator CBP upregulates hTERT expression and tumor growth and predicts poor prognosis in human lung cancers. Oncotarget 2014; 5:9349-61. [PMID: 25294805 PMCID: PMC4253439 DOI: 10.18632/oncotarget.2430] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 09/02/2014] [Indexed: 12/12/2022] Open
Abstract
Upregulated expression and activation of human telomerase reverse transcriptase (hTERT) is a hallmarker of lung tumorigenesis. However, the mechanism underlying the aberrant hTERT activity in lung cancer cells remains poorly understood. In this study, we found the transcriptional co-activator CBP as a new hTERT promoter-binding protein that regulated hTERT expression and tumor growth in lung adenocarcinoma cells using a biotin-streptavidin-bead pulldown technique. Chromatin immunoprecipitation assay verified the immortalized cell and tumor cell-specific binding of CBP on hTERT promoter. Overexpression of exogenous CBP upregulated the expression of the hTERT promoter-driven luciferase and endogenous hTERT protein in lung cancer cells. Conversely, inhibition of CBP by CBP-specific siRNA or its chemical inhibitor repressed the expression of hTERT promoter-driven luciferase and endogenous hTERT protein as well as telomerase activity. Moreover, inhibition of CBP expression or activity also significantly reduced the proliferation of lung cancer cells in vitro and tumor growth in an xenograft mouse model in vivo. Immunohistochemical analysis of tissue microarrays of lung cancers revealed a positive correlation between CBP and hTERT. Importantly, the patients with high CBP and hTERT expression had a significantly shorter overall survival. Furthermore, CBP was found to interact with and acetylate transactivator Sp1 in lung cancer cells. Inhibition of CBP by CBP-specific siRNA or its chemical inhibitor significantly inhibited Sp1 acetylation and its binding to the hTERT promoter. Collectively, our results indicate that CBP contributes to the upregulation of hTERT expression and tumor growth, and overexpression of CBP predicts poor prognosis in human lung cancers.
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Affiliation(s)
- Wei Guo
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Jianjun Lu
- Department of Thoracic Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Meng Dai
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Taihua Wu
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Zhenlong Yu
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Jingshu Wang
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China; Colaborative Innovation Center of Cancer Medicine, Guangzhou, China
| | - Wangbing Chen
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China; Colaborative Innovation Center of Cancer Medicine, Guangzhou, China
| | - Dingbo Shi
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China; Colaborative Innovation Center of Cancer Medicine, Guangzhou, China
| | - Wendan Yu
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Yao Xiao
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Canhui Yi
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Zhipeng Tang
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Tingting Xu
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Xiangsheng Xiao
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China; Colaborative Innovation Center of Cancer Medicine, Guangzhou, China
| | - Yuhui Yuan
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Quentin Liu
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China; Colaborative Innovation Center of Cancer Medicine, Guangzhou, China
| | - Guangwei Du
- Department of Integrative Biology and Pharmacology, The University of Texas Health Science Center, Houston, Texas, USA
| | - Wuguo Deng
- Institute of Cancer Stem Cell & First Affiliated Hospital, Dalian Medical University, Dalian, China
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China; Colaborative Innovation Center of Cancer Medicine, Guangzhou, China
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Abstract
Skin is a self-renewing tissue that is required to go through extensive proliferation throughout the lifespan of an organism. Telomere shortening acts as a mitotic clock that prevents aberrant proliferation such as cancer. A consequence of this protection is cellular senescence and ageing. The telomerase enzyme complex maintains telomere length in germline cells and in cancer cells. Telomerase is also active in certain somatic cells such as those in the epidermis but is almost undetectable in the dermis. Increasing evidence indicates that telomerase plays a significant role in maintenance of skin function and proliferation. Mutations in telomerase component genes in the disease dyskeratosis congenita result in numerous epidermal abnormalities. Studies also indicate that telomerase activity in epidermal stem cells might have roles that go beyond telomere elongation. Telomeres in skin cells may be particularly susceptible to accelerated shortening because of both proliferation and DNA-damaging agents such as reactive oxygen species. Skin might present an accessible tissue for manipulation of telomerase activity and telomere length with the potential of ameliorating skin diseases associated with ageing.
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Affiliation(s)
- Erin M Buckingham
- Department of Microbiology, University of Iowa, Iowa City, IA 52242, USA
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O'Kane M, Markham T, McEvoy AN, Fearon U, Veale DJ, FitzGerald O, Kirby B, Murphy EP. Increased Expression of the Orphan Nuclear Receptor NURR1 in Psoriasis and Modulation following TNF-α Inhibition. J Invest Dermatol 2008; 128:300-10. [PMID: 17671512 DOI: 10.1038/sj.jid.5701023] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The orphan nuclear receptor NURR1 belongs to the NR4A subfamily of transcription factors which are emerging as important mediators of cytokine and growth factor signaling. The transcriptional function of these ligand-independent and constitutively active receptors is controlled at the level of expression and nuclear localization. This study examines the expression of NURR1 in psoriasis and biological effects on this receptor following inhibition of tumor necrosis factor-alpha (TNF-alpha) signaling. We report increased expression of NURR1 mRNA and protein in involved psoriasis skin compared with uninvolved and normal skin, which correlates significantly (P=0.0055) with clinical measures of the psoriasis area and severity index. Enhanced NURR1 expression localizes to both nucleus and cytoplasm of cells of involved epidermis, blood vessels, and inflammatory infiltrates, in contrast to predominant cytoplasmic distribution in uninvolved and normal skin. Endogenous NURR1 levels are rapidly and selectively increased in response to proinflammatory agonists and growth factors in normal dermal endothelial cells. Following TNF-alpha inhibition with infliximab or etanercept, NURR1 mRNA and protein levels in involved skin are significantly decreased and cytoplasmic distribution is restored. These findings establish the aberrant expression and distribution of NURR1 in psoriasis and suggest that clinical benefits of TNF-alpha inhibition may be mediated through altered NURR1 activity.
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Affiliation(s)
- Marina O'Kane
- College of Life Sciences, UCD Veterinary Sciences Centre, Dublin, Ireland
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