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Arcidiacono P, Webb CM, Brooke MA, Zhou H, Delaney PJ, Ng KE, Blaydon DC, Tinker A, Kelsell DP, Chikh A. p63 is a key regulator of iRHOM2 signalling in the keratinocyte stress response. Nat Commun 2018; 9:1021. [PMID: 29523849 PMCID: PMC5844915 DOI: 10.1038/s41467-018-03470-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 02/14/2018] [Indexed: 02/06/2023] Open
Abstract
Hyperproliferative keratinocytes induced by trauma, hyperkeratosis and/or inflammation display molecular signatures similar to those of palmoplantar epidermis. Inherited gain-of-function mutations in RHBDF2 (encoding iRHOM2) are associated with a hyperproliferative palmoplantar keratoderma and squamous oesophageal cancer syndrome (termed TOC). In contrast, genetic ablation of rhbdf2 in mice leads to a thinning of the mammalian footpad, and reduces keratinocyte hyperproliferation and migration. Here, we report that iRHOM2 is a novel target gene of p63 and that both p63 and iRHOM2 differentially regulate cellular stress-associated signalling pathways in normal and hyperproliferative keratinocytes. We demonstrate that p63-iRHOM2 regulates cell survival and response to oxidative stress via modulation of SURVIVIN and Cytoglobin, respectively. Furthermore, the antioxidant compound Sulforaphane downregulates p63-iRHOM2 expression, leading to reduced proliferation, inflammation, survival and ROS production. These findings elucidate a novel p63-associated pathway that identifies iRHOM2 modulation as a potential therapeutic target to treat hyperproliferative skin disease and neoplasia.
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Affiliation(s)
- Paola Arcidiacono
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Catherine M Webb
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Matthew A Brooke
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Huiqing Zhou
- Department of Human Genetics, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
- Department of Molecular Developmental Biology, Radboud University, Nijmegen, The Netherlands
| | - Paul J Delaney
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Keat-Eng Ng
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Diana C Blaydon
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Andrew Tinker
- The Heart Centre, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Charterhouse Square, London, EC1M 6BQ, UK
| | - David P Kelsell
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK.
| | - Anissa Chikh
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK.
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2
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Vesela B, Matalova E. Detection of Bim and Puma in mouse hair follicles using immunofluorescence and TUNEL assay double staining. Biotech Histochem 2015; 90:587-93. [DOI: 10.3109/10520295.2015.1062916] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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3
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Yoh K, Prywes R. Pathway Regulation of p63, a Director of Epithelial Cell Fate. Front Endocrinol (Lausanne) 2015; 6:51. [PMID: 25972840 PMCID: PMC4412127 DOI: 10.3389/fendo.2015.00051] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 04/02/2015] [Indexed: 02/03/2023] Open
Abstract
The p53-related gene p63 is required for epithelial cell establishment and its expression is often altered in tumor cells. Great strides have been made in understanding the pathways and mechanisms that regulate p63 levels, such as the Wnt, Hedgehog, Notch, and EGFR pathways. We discuss here the multiple signaling pathways that control p63 expression as well as transcription factors and post-transcriptional mechanisms that regulate p63 levels. While a unified picture has not emerged, it is clear that the fine-tuning of p63 has evolved to carefully control epithelial cell differentiation and fate.
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Affiliation(s)
- Kathryn Yoh
- Department of Biological Sciences, Columbia University, New York, NY, USA
| | - Ron Prywes
- Department of Biological Sciences, Columbia University, New York, NY, USA
- *Correspondence: Ron Prywes, Department of Biological Sciences, Columbia University, Fairchild 813A, MC2420, 1212 Amsterdam Avenue, New York, NY 10027, USA,
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DeSUMOylating isopeptidase: a second class of SUMO protease. EMBO Rep 2012; 13:339-46. [PMID: 22370726 DOI: 10.1038/embor.2012.3] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 12/30/2011] [Accepted: 01/09/2012] [Indexed: 12/14/2022] Open
Abstract
The modification of proteins by small ubiquitin-like modifier (SUMO) is crucial for the regulation of diverse cellular processes. Protein SUMOylation is reversed by isopeptidases, collectively known as deSUMOylases. Only one family of SUMO-specific proteases has been described so far: the sentrin-specific proteases (SENP). Here, we identify and characterize a new deSUMOylase, which we have named DeSI-1 (DeSumoylating Isopeptidase 1). We describe BZEL—a new transcriptional repressor—as substrate of DeSI-1. DeSI-1 catalyses the deSUMOylation, but not the deubiquitination, of BZEL. Furthermore, the SENP substrates PML and ΔNp63 are not deSUMOylated by DeSI-1, suggesting that SENP and DeSI enzymes recognize different sets of substrates. Together, these data identify a second class of SUMO proteases.
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TRAIL-induced keratinocyte differentiation requires caspase activation and p63 expression. J Invest Dermatol 2011; 131:874-83. [PMID: 21248767 DOI: 10.1038/jid.2010.402] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Cornification, the terminal differentiation of keratinocytes, is a special form of programmed cell death in the skin. In this article, we report that tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) can induce the expression of the keratinocyte differentiation markers involucrin and type 1 transglutaminase in normal human epidermal keratinocytes. The induction of differentiation occurs mainly under the activation of caspases 3 and 8, and apoptosis can also be triggered. Inhibition of these apoptotic caspases attenuates both apoptosis and differentiation of keratinocytes caused by TRAIL but barely affects the induction of differentiation caused by calcium and phorbol 12-myristate 13-acetate. Differential regulation of extracellular signal-regulated kinase and p38 activation by TRAIL is also observed. Moreover, the degradation of p63 is induced by TRAIL-elicited caspase activation. However, the existence of p63 is essential for the initiation of keratinocyte differentiation by TRAIL because knockdown of ΔNp63 decreases TRAIL-induced differentiation. Taken together, our results suggest that TRAIL can be an inducer of both differentiation and apoptosis in human keratinocytes, and that caspases critically mediate these processes. This study identifies a new role of apoptotic caspases for terminal differentiation of keratinocytes and further elucidates the molecular pathways involved in this unique model of cell death.
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Chatterjee A, Chang X, Sen T, Ravi R, Bedi A, Sidransky D. Regulation of p53 family member isoform DeltaNp63alpha by the nuclear factor-kappaB targeting kinase IkappaB kinase beta. Cancer Res 2010; 70:1419-29. [PMID: 20145131 DOI: 10.1158/0008-5472.can-09-2613] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The p53 family gene p63 plays an instrumental role in cellular stress responses including responses to DNA damage. In addition to encoding a full-length transcriptional activator, p63 also encodes several dominant inhibitory isoforms including the isoform DeltaNp63alpha, the function of which is not fully understood. DeltaNp63alpha is degraded in response to DNA damage, thereby enabling an effective cellular response to genotoxic agents. Here, we identify a key molecular mechanism underlying regulation of DeltaNp63alpha expression in response to chemotherapeutic agents or tumor necrosis factor-alpha. We found that DeltaNp63alpha interacts with IkappaB kinase (IKK), a multisubunit protein kinase that consists of two catalytic subunits, IKKalpha and IKKbeta, and a regulatory subunit, IKKgamma. The IKKbeta kinase promotes ubiquitin-mediated proteasomal degradation of DeltaNp63alpha, whereas a kinase-deficient mutant IKKbeta-K44A fails to do so. Cytokine- or chemotherapy-induced stimulation of IKKbeta caused degradation of DeltaNp63alpha and augmented transactivation of p53 family-induced genes involved in the cellular response to DNA damage. Conversely, IKKbeta inhibition attenuated cytokine- or chemotherapy-induced degradation of DeltaNp63alpha. Our findings show that IKKbeta plays an essential role in regulating DeltaNp63alpha in response to extrinsic stimuli. IKK activation represents one mechanism by which levels of DeltaNp63alpha can be reduced, thereby rendering cells susceptible to cell death in the face of cellular stress or DNA damage.
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Affiliation(s)
- Aditi Chatterjee
- Division of Head and Neck Cancer Research, Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA
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Abstract
Understanding the complexity of cancer depends on an elucidation of the underlying regulatory networks, at the cellular and intercellular levels and in their temporal dimension. This Opinion article focuses on the multilevel crosstalk between the Notch pathway and the p53 and p63 pathways. These two coordinated signalling modules are at the interface of external damaging signals and control of stem cell potential and differentiation. Positive or negative reciprocal regulation of the two pathways can vary with cell type and cancer stage. Therefore, selective or combined targeting of the two pathways could improve the efficacy and reduce the toxicity of cancer therapies.
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Affiliation(s)
- G Paolo Dotto
- Department of Biochemistry, University of Lausanne, Epalinges CH-1066, Switzerland.
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Herfs M, Hubert P, Delvenne P. Epithelial metaplasia: adult stem cell reprogramming and (pre)neoplastic transformation mediated by inflammation? Trends Mol Med 2009; 15:245-53. [PMID: 19457719 DOI: 10.1016/j.molmed.2009.04.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 04/03/2009] [Accepted: 04/03/2009] [Indexed: 12/17/2022]
Abstract
Throughout adult life, new developmental commitment of adult stem cells causes metaplastic conversions to occur frequently in some organs. These reversible epithelial replacements are almost always observed in association with chronic inflammation and persistent irritation. Although metaplasia is not synonymous with dysplasia, clinical surveillance has demonstrated that these adaptive processes have an increased susceptibility to evolve into cancer. We propose that cytokines and other soluble factors released by both epithelial and inflammatory cells might alter the transcription-factor expression profile of stem cells and lead to the development of metaplasia. Furthermore, inflammatory mediators might also promote the malignant transformation of epithelial metaplasia by inducing genetic and epigenetic changes and by preventing the immune system from mounting an efficient anti-tumour immune response. A better understanding of the molecular mechanisms leading to metaplasia might help in the design of new therapies for neoplastic and degenerative diseases.
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Affiliation(s)
- Michael Herfs
- Laboratory of Experimental Pathology, GIGA-Cancer (Centre for Experimental Cancer Research), University of Liege, Liege, Belgium
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Hackett TL, Shaheen F, Johnson A, Wadsworth S, Pechkovsky DV, Jacoby DB, Kicic A, Stick SM, Knight DA. Characterization of side population cells from human airway epithelium. Stem Cells 2008; 26:2576-85. [PMID: 18653771 DOI: 10.1634/stemcells.2008-0171] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The airway epithelium is the first line of contact with the inhaled external environment and is continuously exposed to and injured by pollutants, allergens, and viruses. However, little is known about epithelial repair and in particular the identity and role of tissue resident stem/progenitor cells that may contribute to epithelial regeneration. The aims of the present study were to identify, isolate, and characterize side population (SP) cells in human tracheobronchial epithelium. Epithelial cells were obtained from seven nontransplantable healthy lungs and four asthmatic lungs by pronase digestion. SP cells were identified by verapamil-sensitive efflux of the DNA-binding dye Hoechst 33342. Using flow cytometry, CD45(-) SP, CD45(+) SP, and non-SP cells were isolated and sorted. CD45(-) SP cells made up 0.12% +/- 0.01% of the total epithelial cell population in normal airway but 4.1% +/- 0.06% of the epithelium in asthmatic airways. All CD45(-) SP cells showed positive staining for epithelial-specific markers cytokeratin-5, E-cadherin, ZO-1, and p63. CD45(-) SP cells exhibited stable telomere length and increased colony-forming and proliferative potential, undergoing population expansion for at least 16 consecutive passages. In contrast with non-SP cells, fewer than 100 CD45(-) SP cells were able to generate a multilayered and differentiated epithelium in air-liquid interface culture. SP cells are present in human tracheobronchial epithelium, exhibit both short- and long-term proliferative potential, and are capable of generation of differentiated epithelium in vitro. The number of SP cells is significantly greater in asthmatic airways, providing evidence of dysregulated resident SP cells in the asthmatic epithelium. Disclosure of potential conflicts of interest is found at the end of this article.
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Affiliation(s)
- Tillie-Louise Hackett
- James Hogg iCAPTURE Centre for Cardiovascular and Pulmonary Disease, St Paul's Hospital, Vancouver, British Columbia, Canada.
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Sun S, Guo FJ, Tong YQ, Zhu JG, Li GC. Colorectal carcinoma-associated antigen Ca-Hb3 detected by one-dimensional SDS-polyacrylamide gel electrophoresis and liquid chromatography-tandem mass spectrometry. World J Gastroenterol 2008; 14:1588-91. [PMID: 18330953 PMCID: PMC2693757 DOI: 10.3748/wjg.14.1588] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To comprehensively identify the proteins of tumor relative antigen Ca-Hb3 recognized by colorectal carcinoma monoclonal antibody Hb3.
METHODS: Ca-Hb3 was isolated by SDS-polyacrylamide gel electrophoresis (PAGE) followed by digestion with trypsin. Trypsin peptides were analyzed by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The proteins identified by mass spectrometry were analyzed using bioinformatics.
RESULTS: Ca-Hb3 was identified as a CKAP4-like protein by Nano HPLC tandem mass spectrometry analysis. The molecular weight of CKAP4-like protein was 62.02 kDa, including one hydrophobic region, one transmembrane domain, five coiled coils, four glycosylation sites and forty-nine phosphorylation sites. CKAP4-like protein had a high homogeneity with DeltaNp63α. The characteristic expression of DeltaNp63α that is considered a potential oncogene in the isoforms of p63 was similar to that of Ca-Hb3.
CONCLUSION: Ca-Hb3 is probably a CKAP4-like protein, belonging to DeltaNp63α isoform of p63 family.
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