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Indirapriyadarshini R, Radhiga T, Kanimozhi G, Prasad NR. Preventive effect of andrographolide against ultraviolet-B radiation-induced oxidative stress and apoptotic signaling in human dermal fibroblasts. Cell Biochem Funct 2023; 41:1370-1382. [PMID: 37842803 DOI: 10.1002/cbf.3871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 09/19/2023] [Accepted: 10/07/2023] [Indexed: 10/17/2023]
Abstract
Ultraviolet radiation induces oxidative photoaging in the skin cells. In this study, we investigated the ability of andrographolide (ADP) to protect human dermal fibroblasts (HDFa) from UVB radiation-induced oxidative stress and apoptosis. The HDFa cells were exposed to UVB (19.8 mJ/cm2 ) radiation in the presence or absence of ADP (7 μM) and then oxidative stress and apoptotic protein expression were analyzed. UVB exposure resulted in a significant decline in the activity of antioxidant enzymes and altered mitochondrial membrane potential (MMP). Furthermore, UVB-irradiation causes increased intracellular reactive oxygen species (ROS) production, apoptotic morphological changes, and lipid peroxidation levels in the HDFa. Moreover, the pretreatment with ADP reduced the UVB-induced cytotoxicity, ROS production, and increased antioxidant enzymes activity. Further, the ADP pretreatment prevents the UVB-induced loss of MMP and apoptotic signaling in HDFa cells. Therefore, the present results suggest that ADP protects HDFa cells from UVB-induced oxidative stress and apoptotic damage.
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Affiliation(s)
| | - Thangaiyan Radhiga
- Department of Biochemistry and Biotechnology, Annamalai University, Annamalainagar, Tamilnadu, India
| | - Govindasamy Kanimozhi
- Department of Biochemistry and Biotechnology, Annamalai University, Annamalainagar, Tamilnadu, India
- Department of Biochemistry, Dharmapuram Gnanambigai Government Arts College for Women, Mayiladuthurai, India
| | - N Rajendra Prasad
- Department of Biochemistry and Biotechnology, Annamalai University, Annamalainagar, Tamilnadu, India
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Dardare J, Witz A, Betz M, Francois A, Meras M, Lamy L, Lambert A, Grandemange S, Husson M, Rouyer M, Demange J, Merlin JL, Harlé A, Gilson P. DDB2 represses epithelial-to-mesenchymal transition and sensitizes pancreatic ductal adenocarcinoma cells to chemotherapy. Front Oncol 2022; 12:1052163. [PMID: 36568213 PMCID: PMC9773984 DOI: 10.3389/fonc.2022.1052163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 11/14/2022] [Indexed: 12/13/2022] Open
Abstract
Introduction Damage specific DNA binding protein 2 (DDB2) is an UV-indiced DNA damage recognition factor and regulator of cancer development and progression. DDB2 has dual roles in several cancers, either as an oncogene or as a tumor suppressor gene, depending on cancer localization. Here, we investigated the unresolved role of DDB2 in pancreatic ductal adenocarcinoma (PDAC). Methods The expression level of DDB2 in pancreatic cancer tissues and its correlation with patient survival were evaluated using publicly available data. Two PDAC cell models with CRISPR-modified DDB2 expression were developed: DDB2 was repressed in DDB2-high T3M4 cells (T3M4 DDB2-low) while DDB2 was overexpressed in DDB2-low Capan-2 cells (Capan-2 DDB2-high). Immunofluorescence and qPCR assays were used to investigate epithelial-to-mesenchymal transition (EMT) in these models. Migration and invasion properties of the cells were also determined using wound healing and transwell assays. Sensitivity to 5-fluorouracil (5-FU), oxaliplatin, irinotecan and gemcitabine were finally investigated by crystal violet assays. Results DDB2 expression level was reduced in PDAC tissues compared to normal ones and DDB2-low levels were correlated to shorter disease-free survival in PDAC patients. DDB2 overexpression increased expression of E-cadherin epithelial marker, and decreased levels of N-cadherin mesenchymal marker. Conversely, we observed opposite effects in DDB2 repression and enhanced transcription of SNAIL, ZEB1, and TWIST EMT transcription factors (EMT-TFs). Study of migration and invasion revealed that these properties were negatively correlated with DDB2 expression in both cell models. DDB2 overexpression sensitized cells to 5-fluorouracil, oxaliplatin and gemcitabine. Conclusion Our study highlights the potential tumor suppressive effects of DDB2 on PDAC progression. DDB2 could thus represent a promising therapeutic target or biomarker for defining prognosis and predicting chemotherapy response in patients with PDAC.
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Affiliation(s)
- Julie Dardare
- Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR) 7039 Centre de Recherche en Automatique de Nancy (CRAN), Nancy, France,Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France,*Correspondence: Julie Dardare,
| | - Andréa Witz
- Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR) 7039 Centre de Recherche en Automatique de Nancy (CRAN), Nancy, France,Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Margaux Betz
- Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR) 7039 Centre de Recherche en Automatique de Nancy (CRAN), Nancy, France,Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Aurélie Francois
- Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR) 7039 Centre de Recherche en Automatique de Nancy (CRAN), Nancy, France,Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Morgane Meras
- Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Laureline Lamy
- Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR) 7039 Centre de Recherche en Automatique de Nancy (CRAN), Nancy, France,Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Aurélien Lambert
- Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Stéphanie Grandemange
- Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR) 7039 Centre de Recherche en Automatique de Nancy (CRAN), Nancy, France
| | - Marie Husson
- Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Marie Rouyer
- Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Jessica Demange
- Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Jean-Louis Merlin
- Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR) 7039 Centre de Recherche en Automatique de Nancy (CRAN), Nancy, France,Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Alexandre Harlé
- Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR) 7039 Centre de Recherche en Automatique de Nancy (CRAN), Nancy, France,Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
| | - Pauline Gilson
- Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR) 7039 Centre de Recherche en Automatique de Nancy (CRAN), Nancy, France,Service de Biopathologie, Institut de Cancérologie de Lorraine, Vandoeuvre-les-Nancy, France
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Gary AS, Rochette PJ. Apoptosis, the only cell death pathway that can be measured in human diploid dermal fibroblasts following lethal UVB irradiation. Sci Rep 2020; 10:18946. [PMID: 33144600 PMCID: PMC7609555 DOI: 10.1038/s41598-020-75873-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/06/2020] [Indexed: 12/14/2022] Open
Abstract
Ultraviolet radiation (UVR) is a major environmental genotoxic agent. In skin, it can lead to the formation of mutagenic DNA damage. Several mechanisms are in place to prevent the conversion of these DNA damage into skin cancer-driver mutations. An important mutation prevention mechanism is the programmed cell death, which can safely dispose of the damaged cells. Apoptosis is the most studied and best characterised programmed cell death, but an increasing amount of new cell death pathways are emerging. Using different pharmacological cell death inhibitors and antioxidants, we have evaluated the implication of apoptosis, necroptosis, ferroptosis and parthanatos in UVB-induced cell death in human diploid dermal fibroblasts. Our results show that apoptosis is the only known cell death mechanism induced by UVB irradiation in fibroblasts. We also showed that lethal UVB irradiation induces a PARP-dependent drastic loss of cellular metabolic activity caused by an overused of NAD+.
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Affiliation(s)
- Anne-Sophie Gary
- Centre de Recherche du CHU de Québec-Université Laval, Axe Médecine Régénératrice, Hôpital du Saint-Sacrement, Quebec, QC, Canada.,Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Quebec, QC, Canada
| | - Patrick J Rochette
- Centre de Recherche du CHU de Québec-Université Laval, Axe Médecine Régénératrice, Hôpital du Saint-Sacrement, Quebec, QC, Canada. .,Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Quebec, QC, Canada. .,Département d'Ophtalmologie et ORL-Chirurgie Cervico-Faciale, Université Laval, Quebec, QC, Canada.
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4
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Li H, Zhang H, Huang G, Dou Z, Xie Y, Si J, Di C. Heavy ion radiation-induced DNA damage mediates apoptosis via the Rpl27a-Rpl5-MDM2-p53/E2F1 signaling pathway in mouse spermatogonia. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 201:110831. [PMID: 32535367 DOI: 10.1016/j.ecoenv.2020.110831] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/21/2020] [Accepted: 05/28/2020] [Indexed: 06/11/2023]
Abstract
The risk of exposure to ionizing radiation (IR) environments has increased with the development of nuclear technology. IR exposure induces excessive apoptosis of the spermatogonia, which leads to male infertility. Spermatogonia apoptosis may be involved in ribosomal stress triggered by DNA damage following exposure to IR because ribosomal proteins (RPs) directly interact with mouse double minute 2 homolog (MDM2) to induce apoptosis. This study aimed to use comparative proteomics and transcriptomics approach to screen the differential RPs and ribosomal mRNAs in mouse testes following high linear energy transfer (LET) carbon ion radiation (CIR). The expression of ribosomal large subunit protein 27a (Rpl27a) decreased at both protein and mRNA levels in the spermatogonia in vivo. After 6 h of CIR, the immunofluorescence signal of 8-oxo-dG and phosphorylated ataxia-telangiectasia-mutated protein (ATM)/histone H2Ax increased, but that of Rpl27a decreased in the spermatogonia of p53 wild-type and knockout mouse testes. Moreover, the nucleolin was scattered throughout the nucleoplasm after CIR. These results suggested that CIR-induced DNA damage might trigger ribosomal stress, and the reduction in the expression of Rpl27a was associated with DNA damage in the spermatogonia. Similarly, in vitro, the immunofluorescence signal of 8-oxo-dG increased in the GC-1 cells after CIR. Moreover, the expression of Rpl27a was regulated by DNA damage because the co-transfection of ATM and Rpl27a or inhibition of ATM-treated CIR could restore the expression of Rpl27a. Furthermore, the reduction in the expression of Rpl27a led to weakened binding of E2F transcription factor 1 (E2F1) and p53 to MDM2, causing p53 activation and E2F1 degradation in p53 wild-type and knockdown GC-1 cells. This study proposed that heavy ion radiation-induced DNA damage mediated spermatogonia apoptosis via the Rpl27a-Rpl5-MDM2-p53/E2F1 signaling pathway. The results provided the underlying molecular mechanisms of spermatogonia apoptosis following exposure to high LET radiation.
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Affiliation(s)
- Hongyan Li
- Department of Medical Physics, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Basic Research on Heavy Ion Radiation Application in Medicine, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Hong Zhang
- Department of Medical Physics, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Basic Research on Heavy Ion Radiation Application in Medicine, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100039, China.
| | - Guomin Huang
- Department of Medical Physics, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Basic Research on Heavy Ion Radiation Application in Medicine, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Zhihui Dou
- Department of Medical Physics, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Basic Research on Heavy Ion Radiation Application in Medicine, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Yi Xie
- Department of Medical Physics, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Basic Research on Heavy Ion Radiation Application in Medicine, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Jing Si
- Department of Medical Physics, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Basic Research on Heavy Ion Radiation Application in Medicine, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Cuixia Di
- Department of Medical Physics, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Basic Research on Heavy Ion Radiation Application in Medicine, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100039, China
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5
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Brash DE. Rethinking Causation for Data-intensive Biology: Constraints, Cancellations, and Quantized Organisms: Causality in complex organisms is sculpted by constraints rather than instigators, with outcomes perhaps better described by quantized patterns than rectilinear pathways. Bioessays 2020; 42:e1900135. [PMID: 32484248 PMCID: PMC7518294 DOI: 10.1002/bies.201900135] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 03/19/2020] [Indexed: 12/22/2022]
Abstract
Complex organisms thwart the simple rectilinear causality paradigm of "necessary and sufficient," with its experimental strategy of "knock down and overexpress." This Essay organizes the eccentricities of biology into four categories that call for new mathematical approaches; recaps for the biologist the philosopher's recent refinements to the causation concept and the mathematician's computational tools that handle some but not all of the biological eccentricities; and describes overlooked insights that make causal properties of physical hierarchies such as emergence and downward causation straightforward. Reviewing and extrapolating from similar situations in physics, it is suggested that new mathematical tools for causation analysis incorporating feedback, signal cancellation, nonlinear dependencies, physical hierarchies, and fixed constraints rather than instigative changes will reveal unconventional biological behaviors. These include "eigenisms," organisms that are limited to quantized states; trajectories that steer a system such as an evolving species toward optimal states; and medical control via distributed "sheets" rather than single control points.
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Affiliation(s)
- Douglas E Brash
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, CT, 06520-8040, USA
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6
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Yusuf A, Casey A. Liposomal encapsulation of silver nanoparticles (AgNP) improved nanoparticle uptake and induced redox imbalance to activate caspase-dependent apoptosis. Apoptosis 2019; 25:120-134. [PMID: 31863325 DOI: 10.1007/s10495-019-01584-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Macrophages play a crucial role in several diseases' development and progression, such as in cancer and arthritis through ROS generation and inflammation. This makes macrophages a therapeutic target in these diseases. While silver nanoparticles (AgNP) have been widely used as an antibacterial and investigated as anticancer, its potential against macrophages may be limited due to its inherent oxidative mechanism. Here we encapsulated AgNP in a dipalmitoyl-phosphatidyl choline (DPPC) liposome (forming Lipo-AgNP) to suppress AgNP-induced ROS and enhance its cytotoxicity against THP1-differentiated macrophages (TDM). Our findings showed that while Lipo-AgNP had significantly more of a cytotoxic effect on TDMs (p < 0.01), it also significantly suppressed AgNP induced ROS generation and unexpectedly suppressed reduced glutathione (GSH) levels (p < 0.05) resulting in a redox imbalance in comparison to the unexposed control TDMs. Lipo-AgNP was also found to cause an increase DNA damage through H2AX histone phosphorylation and inhibition of Bcl-2 protein expression. This increased the Bax/Bcl2 ratio causing possible release of cytochrome C and subsequent caspase 3/7-dependent apoptosis. It was found that the difference between the mechanism of AgNP and Lipo-AgNP cytotoxicity may have been through the significantly increased Lipo-AgNP uptake by the TDMs as early as 30 min post-exposure (p < 0.05), changing the nanoparticle pharmacokinetic. In conclusion, the improved uptake of AgNP within the liposome caused ROS-independent caspase activation induced by Lipo-AgNP and this was facilitated by increased DNA damage, the induced redox imbalance and an increased Bax/Bcl-2 ratio.
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Affiliation(s)
- Azeez Yusuf
- School of Physics, Technological University Dublin, Kevin Street, Dublin 8, Ireland. .,Nanolab Research Centre, FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland.
| | - Alan Casey
- School of Physics, Technological University Dublin, Kevin Street, Dublin 8, Ireland.,Nanolab Research Centre, FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland
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7
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Chen YT, Chen JJ, Wang HT. Targeting RNA Polymerase I with Hernandonine Inhibits Ribosomal RNA Synthesis and Tumor Cell Growth. Mol Cancer Res 2019; 17:2294-2305. [PMID: 31409627 DOI: 10.1158/1541-7786.mcr-19-0402] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/08/2019] [Accepted: 08/08/2019] [Indexed: 11/16/2022]
Abstract
RNA polymerase I (RNA Pol. I) activity is consistently expanded in multiplying cells to continue the expanded interest for ribosome generation and protein synthesis, which are fundamental for cell development and division. Thus, selective inhibitors of RNA Pol. I may offer a general helpful intends to block cancer cell multiplication. Hernandonine, isolated from the root wood of Hernandia nymphaeifolia, causes rearrangement of nucleolar proteins consistent with segregation of the nucleolus, a hallmark of RNA Pol. I transcription stress. Furthermore, the compound destabilizes RPA194, the large catalytic protein of RNA Pol. I, in a proteasome-dependent manner and inhibits nascent rRNA synthesis and expression of the 45S rRNA precursor. Finally, hernandonine induces cellular apoptosis through a p53-dependent or p53-independent process in solid tumor cell lines. These outcomes feature the prevailing effect of RNA Pol. I transcription stress on apoptosis pathway initiation and present a synthetically novel and significant molecule that represses RNA Pol. I, making it a potential objective for malignancy treatment. IMPLICATIONS: Our findings position hernandonine as a potential, particular, and orally administered cancer treatment agent appropriate for use in investigational clinical trials.
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Affiliation(s)
- Yen-Ting Chen
- Department of Pharmacology, National Yang-Ming University, Taipei, Taiwan
| | - Jih-Jung Chen
- Faculty of Pharmacy, School of Pharmaceutical Sciences, National Yang-Ming University, Taipei, Taiwan.,Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
| | - Hsiang-Tsui Wang
- Department of Pharmacology, National Yang-Ming University, Taipei, Taiwan.
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8
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Yu Y, Xiong Y, Ladeiras D, Yang Z, Ming XF. Myosin 1b Regulates Nuclear AKT Activation by Preventing Localization of PTEN in the Nucleus. iScience 2019; 19:39-53. [PMID: 31349190 PMCID: PMC6660601 DOI: 10.1016/j.isci.2019.07.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 05/17/2019] [Accepted: 07/05/2019] [Indexed: 02/08/2023] Open
Abstract
Insulin-induced AKT activation is dependent on phosphoinositide 3-kinase and opposed by tumor suppressor phosphatase and tensin homolog (PTEN). Our previous study demonstrates that myosin 1b (MYO1B) mediates arginase-II-induced activation of mechanistic target of rapamycin complex 1 that is regulated by AKT. However, the role of MYO1B in AKT activation is unknown. Here we show that silencing MYO1B in mouse embryonic fibroblasts (MEF) inhibits insulin-induced nuclear but not cytoplasmic AKT activation accompanied by elevated nuclear PTEN level. Co-immunoprecipitation, co-immunostaining, and proximity ligation assay show an interaction of MYO1B and PTEN resulting in reduced nuclear PTEN. Moreover, the elevated nuclear PTEN upon silencing MYO1B promotes apoptosis of MEFs and melanoma B16F10 cells. Taken together, we demonstrate that MYO1B, by interacting with PTEN, prevents nuclear localization of PTEN contributing to nuclear AKT activation and suppression of cell apoptosis. This may present a therapeutic approach for cancer treatment such as melanoma. MYO1B, by interacting with PTEN, prevents PTEN localization in the nucleus MYO1B prevents nuclear localization of PTEN depending on its motor activity This contributes to nuclear AKT activation and suppression of cell apoptosis Targeting MYO1B may represent a therapeutic approach for cancer treatment
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Affiliation(s)
- Yi Yu
- Cardiovascular and Aging Research, Department of Endocrinology, Metabolism and Cardiovascular System, Medicine Section, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 5, 1700 Fribourg, Switzerland
| | - Yuyan Xiong
- Cardiovascular and Aging Research, Department of Endocrinology, Metabolism and Cardiovascular System, Medicine Section, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 5, 1700 Fribourg, Switzerland
| | - Diogo Ladeiras
- Cardiovascular and Aging Research, Department of Endocrinology, Metabolism and Cardiovascular System, Medicine Section, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 5, 1700 Fribourg, Switzerland
| | - Zhihong Yang
- Cardiovascular and Aging Research, Department of Endocrinology, Metabolism and Cardiovascular System, Medicine Section, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 5, 1700 Fribourg, Switzerland.
| | - Xiu-Fen Ming
- Cardiovascular and Aging Research, Department of Endocrinology, Metabolism and Cardiovascular System, Medicine Section, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 5, 1700 Fribourg, Switzerland.
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9
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Grafanaki K, Anastasakis D, Kyriakopoulos G, Skeparnias I, Georgiou S, Stathopoulos C. Translation regulation in skin cancer from a tRNA point of view. Epigenomics 2018; 11:215-245. [PMID: 30565492 DOI: 10.2217/epi-2018-0176] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Protein synthesis is a central and dynamic process, frequently deregulated in cancer through aberrant activation or expression of translation initiation factors and tRNAs. The discovery of tRNA-derived fragments, a new class of abundant and, in some cases stress-induced, small Noncoding RNAs has perplexed the epigenomics landscape and highlights the emerging regulatory role of tRNAs in translation and beyond. Skin is the biggest organ in human body, which maintains homeostasis of its multilayers through regulatory networks that induce translational reprogramming, and modulate tRNA transcription, modification and fragmentation, in response to various stress signals, like UV irradiation. In this review, we summarize recent knowledge on the role of translation regulation and tRNA biology in the alarming prevalence of skin cancer.
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Affiliation(s)
- Katerina Grafanaki
- Department of Biochemistry, School of Medicine, University of Patras, 26504 Patras, Greece.,Department of Dermatology, School of Medicine, University of Patras, 26504 Patras, Greece
| | - Dimitrios Anastasakis
- National Institute of Musculoskeletal & Arthritis & Skin, NIH, 50 South Drive, Room 1152, Bethesda, MD 20892, USA
| | - George Kyriakopoulos
- Department of Biochemistry, School of Medicine, University of Patras, 26504 Patras, Greece
| | - Ilias Skeparnias
- Department of Biochemistry, School of Medicine, University of Patras, 26504 Patras, Greece
| | - Sophia Georgiou
- Department of Dermatology, School of Medicine, University of Patras, 26504 Patras, Greece
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10
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Shaik T, Rather GM, Bansal N, Minko T, Garbuzenko O, Szekely Z, Abali EE, Banerjee D, Kerrigan JE, Scotto KW, Bertino JR. Modeling and antitumor studies of a modified L-penetratin peptide targeting E2F in lung cancer and prostate cancer. Oncotarget 2018; 9:33249-33257. [PMID: 30279956 PMCID: PMC6161789 DOI: 10.18632/oncotarget.26064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 08/15/2018] [Indexed: 01/05/2023] Open
Abstract
E2F1-3a overexpression due to amplification or to mutation or loss of the retinoblastoma gene, induces genes involved in DNA synthesis and leads to abnormal cellular proliferation, tumor growth, and invasion. Therefore, inhibiting the overexpression of one or more of these activating E2Fs is a recognized target in cancer therapeutics. In previous studies we identified by phage display, a novel 7-mer peptide (PEP) that bound tightly to an immobilized consensus E2F1 promoter sequence, and when conjugated to penetratin to increase its uptake into cells, was cytotoxic to several malignant cell lines and human prostate and small cell lung cancer xenografts. Based on molecular simulation studies that showed that the D-Arg penetratin peptide (D-Arg PEP) secondary structure is more stable than the L-Arg PEP, the L-Arg in the peptide was substituted with D-Arg. In vitro studies confirmed that it was more stable than the L- form and was more cytotoxic as compared to the L-Arg PEP when tested against the human castrate resistant cell line, DU145 and the human lung cancer H196 cell line. When encapsulated in PEGylated liposomes, the D-Arg-PEP potently inhibited growth of the DU145 xenograft in mice. Our findings validate D- Arg PEP, an inhibitor of E2F1and 3a transcription, as an improved second generation drug candidate for targeted molecular therapy of cancers with elevated levels of activated E2F(s).
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Affiliation(s)
- Tazeem Shaik
- Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | - Gulam M Rather
- Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | - Nitu Bansal
- Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | - Tamara Minko
- Department of Pharmaceutics, Ernest Mario School of Pharmacy, Rutgers: The State University of New Jersey, Piscataway, NJ, USA
| | - Olga Garbuzenko
- Department of Pharmaceutics, Ernest Mario School of Pharmacy, Rutgers: The State University of New Jersey, Piscataway, NJ, USA
| | - Zoltan Szekely
- Department of Pharmaceutics, Ernest Mario School of Pharmacy, Rutgers: The State University of New Jersey, Piscataway, NJ, USA
| | - Emine E Abali
- Department of Biochemistry & Molecular Biology, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
| | - Debabrata Banerjee
- Department of Pharmacology, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
| | - John E Kerrigan
- Information Technology Division of Life Sciences and Chemistry, Rutgers School of Arts and Sciences, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
| | - Kathleen W Scotto
- Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | - Joseph R Bertino
- Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA.,Department of Pharmacology, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, Piscataway, NJ, USA.,Department of Medicine, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
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11
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Chang RS, Chen CS, Huang CL, Chang CT, Cui Y, Chung WJ, Shu WY, Chiang CS, Chuang CY, Hsu IC. Unexpected dose response of HaCaT to UVB irradiation. In Vitro Cell Dev Biol Anim 2018; 54:589-599. [PMID: 30083841 DOI: 10.1007/s11626-018-0280-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 07/12/2018] [Indexed: 11/24/2022]
Abstract
Application of high-dosage UVB irradiation in phototherapeutic dermatological treatments present health concerns attributed to UV-exposure. In assessing UV-induced photobiological damage, we investigated dose-dependent effects of UVB irradiation on human keratinocyte cells (HaCaT). Our study implemented survival and apoptosis assays and revealed an unexpected dose response wherein higher UVB-dosage induced higher viability. Established inhibitors, such as AKT- (LY294002), PKC- (Gö6976, and Rottlerin), ERK- (PD98059), P38 MAPK- (SB203580), and JNK- (SP600125), were assessed to investigate UV-induced apoptotic pathways. Despite unobvious contributions of known signaling pathways in dose-response mediation, microarray analysis identified transcriptional expression of UVB-response genes related to the respiratory-chain. Observed correlation of ROS-production with UVB irradiation potentiated ROS as the underlying mechanism for observed dose responses. Inability of established pathways to explain such responses suggests the complex nature underlying UVB-phototherapy response.
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Affiliation(s)
- Rong-Shing Chang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Section2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
| | - Chi-Shuo Chen
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Section2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
| | - Ching-Lung Huang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Section2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
| | - Chiu-Ting Chang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Section2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
| | - Yujia Cui
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Section2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
| | | | - Wun-Yi Shu
- Institute of Statistics, National Tsing Hua University, Hsinchu, Taiwan
| | - Chi-Shiun Chiang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Section2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
| | - Chun-Yu Chuang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Section2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
| | - Ian C Hsu
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Section2, Kuang-Fu Road, Hsinchu, 30013, Taiwan.
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12
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Acrolein preferentially damages nucleolus eliciting ribosomal stress and apoptosis in human cancer cells. Oncotarget 2018; 7:80450-80464. [PMID: 27741518 PMCID: PMC5348333 DOI: 10.18632/oncotarget.12608] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 10/06/2016] [Indexed: 11/27/2022] Open
Abstract
Acrolein (Acr) is a potent cytotoxic and DNA damaging agent which is ubiquitous in the environment and abundant in tobacco smoke. Acr is also an active cytotoxic metabolite of the anti-cancer drugs cyclophosphamide and ifosfamide. The mechanisms via which Acr exerts its anti-cancer activity and cytotoxicity are not clear. In this study, we found that Acr induces cytotoxicity and cell death in human cancer cells with different activities of p53. Acr preferentially binds nucleolar ribosomal DNA (rDNA) to form Acr-deoxyguanosine adducts, and induces oxidative damage to both rDNA and ribosomal RNA (rRNA). Acr triggers ribosomal stress responses, inhibits rRNA synthesis, reduces RNA polymerase I binding to the promoter of rRNA gene, disrupts nucleolar integrity, and impairs ribosome biogenesis and polysome formation. Acr causes an increase in MDM2 levels and phosphorylation of MDM2 in A549 and HeLa cells which are p53 active and p53 inactive, respectively. It enhances the binding of ribosomal protein RPL11 to MDM2 and reduces the binding of p53 and E2F-1 to MDM2 resulting in stabilization/activation of p53 in A549 cells and degradation of E2F-1 in A549 and HeLa cells. We propose that Acr induces ribosomal stress which leads to activation of MDM2 and RPL11-MDM2 binding, consequently, activates p53 and enhances E2F-1 degradation, and that taken together these two processes induce apoptosis and cell death.
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13
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NDN is an imprinted tumor suppressor gene that is downregulated in ovarian cancers through genetic and epigenetic mechanisms. Oncotarget 2016; 7:3018-32. [PMID: 26689988 PMCID: PMC4823087 DOI: 10.18632/oncotarget.6576] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 11/21/2015] [Indexed: 12/18/2022] Open
Abstract
NDN is a maternally imprinted gene consistently expressed in normal ovarian epithelium, is dramatically downregulated in the majority of ovarian cancers. Little or no NDN expression could be detected in 73% of 351 epithelial ovarian cancers. NDN was also downregulated in 10 ovarian cancer cell lines with total loss in 6 of 10. Re-expression of NDN decreased Bcl-2 levels and induced apoptosis, which significantly inhibited ovarian cancer cell growth in cell culture and in xenografts. In addition, re-expression of NDN inhibited cell migration by decreasing actin stress fiber and focal adhesion complex formation through deactivation of Src, FAK and RhoA. Loss of NDN expression in ovarian cancers could be attributed to LOH in 28% of 18 informative cases and to hypermethylation of CpG sites 1 and 2 of NDN promoter in 23% and 30% of 43 ovarian cancers, respectively. Promoter hypermethylation was also found in 5 of 10 ovarian cancer cell lines. Treatment with the demethylating agent 5-aza-2′-deoxycytidine restored NDN expression in 4 of 7 cell lines with enhanced promoter methylation levels. These observations support the conclusion that NDN is an imprinted tumor suppressor gene which affects cancer cell motility, invasion and growth and that its loss of function in ovarian cancer can be caused by both genetic and epigenetic mechanisms.
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14
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Mallet JD, Dorr MM, Drigeard Desgarnier MC, Bastien N, Gendron SP, Rochette PJ. Faster DNA Repair of Ultraviolet-Induced Cyclobutane Pyrimidine Dimers and Lower Sensitivity to Apoptosis in Human Corneal Epithelial Cells than in Epidermal Keratinocytes. PLoS One 2016; 11:e0162212. [PMID: 27611318 PMCID: PMC5017652 DOI: 10.1371/journal.pone.0162212] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 08/18/2016] [Indexed: 01/13/2023] Open
Abstract
Absorption of UV rays by DNA generates the formation of mutagenic cyclobutane pyrimidine dimers (CPD) and pyrimidine (6-4) pyrimidone photoproducts (6-4PP). These damages are the major cause of skin cancer because in turn, they can lead to signature UV mutations. The eye is exposed to UV light, but the cornea is orders of magnitude less prone to UV-induced cancer. In an attempt to shed light on this paradox, we compared cells of the corneal epithelium and the epidermis for UVB-induced DNA damage frequency, repair and cell death sensitivity. We found similar CPD levels but a 4-time faster UVB-induced CPD, but not 6-4PP, repair and lower UV-induced apoptosis sensitivity in corneal epithelial cells than epidermal. We then investigated levels of DDB2, a UV-induced DNA damage recognition protein mostly impacting CPD repair, XPC, essential for the repair of both CPD and 6-4PP and p53 a protein upstream of the genotoxic stress response. We found more DDB2, XPC and p53 in corneal epithelial cells than in epidermal cells. According to our results analyzing the protein stability of DDB2 and XPC, the higher level of DDB2 and XPC in corneal epithelial cells is most likely due to an increased stability of the protein. Taken together, our results show that corneal epithelial cells have a better efficiency to repair UV-induced mutagenic CPD. On the other hand, they are less prone to UV-induced apoptosis, which could be related to the fact that since the repair is more efficient in the HCEC, the need to eliminate highly damaged cells by apoptosis is reduced.
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Affiliation(s)
- Justin D. Mallet
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec–Université Laval, Hôpital du Saint-Sacrement, Québec City, Québec, Canada
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec City, Québec, Canada
- Département d’Ophtalmologie et ORL—chirurgie cervico-faciale, Université Laval, Québec City, Québec, Canada
| | - Marie M. Dorr
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec–Université Laval, Hôpital du Saint-Sacrement, Québec City, Québec, Canada
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec City, Québec, Canada
- Département d’Ophtalmologie et ORL—chirurgie cervico-faciale, Université Laval, Québec City, Québec, Canada
| | - Marie-Catherine Drigeard Desgarnier
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec–Université Laval, Hôpital du Saint-Sacrement, Québec City, Québec, Canada
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec City, Québec, Canada
- Département d’Ophtalmologie et ORL—chirurgie cervico-faciale, Université Laval, Québec City, Québec, Canada
| | - Nathalie Bastien
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec–Université Laval, Hôpital du Saint-Sacrement, Québec City, Québec, Canada
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec City, Québec, Canada
- Département d’Ophtalmologie et ORL—chirurgie cervico-faciale, Université Laval, Québec City, Québec, Canada
| | - Sébastien P. Gendron
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec–Université Laval, Hôpital du Saint-Sacrement, Québec City, Québec, Canada
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec City, Québec, Canada
- Département d’Ophtalmologie et ORL—chirurgie cervico-faciale, Université Laval, Québec City, Québec, Canada
| | - Patrick J. Rochette
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec–Université Laval, Hôpital du Saint-Sacrement, Québec City, Québec, Canada
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec City, Québec, Canada
- Département d’Ophtalmologie et ORL—chirurgie cervico-faciale, Université Laval, Québec City, Québec, Canada
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15
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Sarkar S, Rajput S, Tripathi AK, Mandal M. Targeted therapy against EGFR and VEGFR using ZD6474 enhances the therapeutic potential of UV-B phototherapy in breast cancer cells. Mol Cancer 2013; 12:122. [PMID: 24138843 PMCID: PMC4015769 DOI: 10.1186/1476-4598-12-122] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 10/08/2013] [Indexed: 11/20/2022] Open
Abstract
Background The hypoxic environment of tumor region stimulated the up regulation of growth factors responsible for angiogenesis and tumor proliferation. Thus, targeting the tumor vasculature along with the proliferation by dual tyrosine kinase inhibitor may be the efficient way of treating advanced breast cancers, which can be further enhanced by combining with radiotherapy. However, the effectiveness of radiotherapy may be severely compromised by toxicities and tumor resistance due to radiation-induced adaptive response contributing to recurrence and metastases of breast cancer. The rational of using ZD6474 is to evaluate the feasibility and efficacy of combined VEGFR2 and EGFR targeting with concurrent targeted and localized UV-B phototherapy in vitro breast cancer cells with the anticipation to cure skin lesions infiltrated with breast cancer cells. Materials and methods Breast cancer cells were exposed to UV-B and ZD6474 and the cell viability, apoptosis, invasion and motility studies were conducted for the combinatorial effect. Graphs and statistical analyses were performed using Graph Pad Prism 5.0. Results ZD6474 and UV-B decreased cell viability in breast cancers in combinatorial manner without affecting the normal human mammary epithelial cells. ZD6474 inhibited cyclin E expression and induced p53 expression when combined with UV-B. It activated stress induced mitochondrial pathway by inducing translocation of bax and cytochrome-c. The combination of ZD6474 with UV-B vs. either agent alone also more potently down-regulated the anti-apoptotic bcl-2 protein, up-regulated pro-apoptotic signaling events involving expression of bax, activation of caspase-3 and caspase-7 proteins, and induced poly (ADP-ribose) polymerase resulting in apoptosis. ZD6474 combined with UV-B inhibited invasion of breast cancer cells in vitro as compared to either single agent, indicating a potential involvement of pro-angiogenic growth factors in regulating the altered expression and reorganization of cytoskeletal proteins in combinatorial treated breast cancer cells. Involvement of combination therapy in reducing the expression of matrix metalloprotease was also observed. Conclusions Collectively, our studies indicate that incorporating an anti-EGFR plus VEGFR strategy (ZD6474) with phototherapy (UV-B), an alternative approach to the ongoing conventional radiotherapy for the treatment of infiltrating metastatic breast cancer cells in the skin and for locally recurrence breast cancer than either approach alone.
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Affiliation(s)
| | | | | | - Mahitosh Mandal
- School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur-721302, West Bengal, India.
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16
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Nys K, Agostinis P. Bcl-2 family members: essential players in skin cancer. Cancer Lett 2012; 320:1-13. [PMID: 22281242 DOI: 10.1016/j.canlet.2012.01.031] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 01/17/2012] [Accepted: 01/18/2012] [Indexed: 12/11/2022]
Abstract
Skin cancer has reached epidemic proportions and is considered to be a direct consequence of ultraviolet (UV) radiation exposure. Excessive exposure of epidermal cells to UV results in apoptosis of irreparably damaged cells to avoid malignant transformation. The Bcl-2 family of proteins is emerging as a crucial regulator of epidermal homeostasis and cell's fate in the stressed skin. Not surprisingly, deregulation of Bcl-2 family members is also chiefly involved in skin carcinogenesis and response to cancer therapy. Here we discuss the physiopathological role of epidermal Bcl-2 family members, their implications in skin carcinogenesis and as potential targets in cancer therapy.
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Affiliation(s)
- Kris Nys
- Cell Death Research & Therapy Unit, Department for Molecular Cell Biology, Catholic University of Leuven, Leuven, Belgium
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17
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UV-induced interaction between p38 MAPK and p53 serves as a molecular switch in determining cell fate. FEBS Lett 2010; 584:4711-6. [DOI: 10.1016/j.febslet.2010.10.057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2010] [Revised: 10/16/2010] [Accepted: 10/26/2010] [Indexed: 12/16/2022]
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18
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Tavana O, Benjamin CL, Puebla-Osorio N, Sang M, Ullrich SE, Ananthaswamy HN, Zhu C. Absence of p53-dependent apoptosis leads to UV radiation hypersensitivity, enhanced immunosuppression and cellular senescence. Cell Cycle 2010; 9:3328-36. [PMID: 20703098 DOI: 10.4161/cc.9.16.12688] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Genotoxic stress triggers the p53 tumor suppressor network to activate cellular responses that lead to cell cycle arrest, DNA repair, apoptosis or senescence. This network functions mainly through transactivation of different downstream targets, including cell cycle inhibitor p21, which is required for short-term cell cycle arrest or long-term cellular senescence, or proapoptotic genes such as p53 upregulated modulator of apoptosis (PUMA) and Noxa. However, the mechanism that switches from cell cycle arrest to apoptosis is still unknown. In this study, we found that mice harboring a hypomorphic mutant p53, R172P, a mutation that abrogates p53-mediated apoptosis while keeping cell cycle control mostly intact, are more susceptible to ultraviolet-B (UVB)-induced skin damage, inflammation and immunosuppression than wild-type mice. p53(R172P) embryonic fibroblasts (MEFs) are hypersensitive to UVB and prematurely senesce after UVB exposure, in stark contrast to wild-type MEFs, which undergo apoptosis. However, these mutant cells are able to repair UV-induced DNA lesions, indicating that the UV hypersensitive phenotype results from the subsequent damage response. Mutant MEFs show an induction of p53 and p21 after UVR, while wild-type MEFs additionally induce PUMA and Noxa. Importantly, p53(R172P) MEFs failed to downregulate anti-apoptotic protein Bcl-2, which has been shown to play an important role in p53-dependent apoptosis. Taken together, these data demonstrate that in the absence of p53-mediated apoptosis, cells undergo cellular senescence to prevent genomic instability. Our results also indicate that p53-dependent apoptosis may play an active role in balancing cellular growth.
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Affiliation(s)
- Omid Tavana
- Department of Immunology, The University of Texas M.D. Anderson Cancer Center, Houston, TX, USA
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19
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Barakat BM, Wang QE, Han C, Milum K, Yin DT, Zhao Q, Wani G, Arafa ESA, El-Mahdy MA, Wani AA. Overexpression of DDB2 enhances the sensitivity of human ovarian cancer cells to cisplatin by augmenting cellular apoptosis. Int J Cancer 2010; 127:977-88. [PMID: 20013802 DOI: 10.1002/ijc.25112] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Cisplatin is one of the most widely used anticancer agents, displaying activity against a wide variety of tumors. However, development of drug resistance presents a challenging barrier to successful cancer treatment by cisplatin. To understand the mechanism of cisplatin resistance, we investigated the role of damaged DNA binding protein complex subunit 2 (DDB2) in cisplatin-induced cytotoxicity and apoptosis. We show that DDB2 is not required for the repair of cisplatin-induced DNA damage, but can be induced by cisplatin treatment. DDB2-deficient noncancer cells exhibit enhanced resistance to cell growth inhibition and apoptosis induced by cisplatin than cells with fully restored DDB2 function. Moreover, DDB2 expression in cisplatin-resistant ovarian cancer cell line CP70 and MCP2 was lower than their cisplatin-sensitive parental A2780 cells. Overexpression of DDB2 sensitized CP70 cells to cisplatin-induced cytotoxicity and apoptosis via activation of the caspase pathway and downregulation of antiapoptotic Bcl-2 protein. Further analysis indicates that the overexpression of DDB2 in CP70 cells downregulates Bcl-2 expression through decreasing Bcl-2 mRNA level. These results suggest that ovarian cancer cells containing high level of DDB2 become susceptible to cisplatin by undergoing enhanced apoptosis.
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Affiliation(s)
- Bassant M Barakat
- Department of Radiology, The Ohio State University, Columbus, OH 43210, USA
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20
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Ikehata H, Okuyama R, Ogawa E, Nakamura S, Usami A, Mori T, Tanaka K, Aiba S, Ono T. Influences of p53 deficiency on the apoptotic response, DNA damage removal and mutagenesis in UVB-exposed mouse skin. Mutagenesis 2010; 25:397-405. [DOI: 10.1093/mutage/geq019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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21
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Bito T, Sumita N, Masaki T, Shirakawa T, Ueda M, Yoshiki R, Tokura Y, Nishigori C. Ultraviolet light induces Stat3 activation in human keratinocytes and fibroblasts through reactive oxygen species and DNA damage. Exp Dermatol 2010; 19:654-60. [DOI: 10.1111/j.1600-0625.2010.01084.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Kutuk O, Arisan ED, Tezil T, Shoshan MC, Basaga H. Cisplatin overcomes Bcl-2-mediated resistance to apoptosis via preferential engagement of Bak: critical role of Noxa-mediated lipid peroxidation. Carcinogenesis 2009; 30:1517-27. [PMID: 19578044 DOI: 10.1093/carcin/bgp165] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Increased expression of antiapoptotic Bcl-2 proteins confers therapeutic resistance in various cancer types. Targeting Bcl-2 proteins by small molecules or activating alternative pathways to bypass Bcl-2-mediated protection to promote apoptosis are two approaches to overcoming therapeutic resistance. Here, we show that cisplatin triggers a Bak-dependent pathway to induce apoptosis in Bcl-2-overexpressing MCF-7 cells. p53-mediated induction of Noxa expression, generation of lipid peroxidation end products and induction of Noxa-Mcl-1 interaction are necessary for this pathway to function. Although Puma is also induced by cisplatin treatment, it is not required for apoptosis. Similarly, reactive oxygen species production by cisplatin did not have any effect on cisplatin-induced apoptosis in MCF-7 Bcl-2 cells. Furthermore, p53 promotes cisplatin-induced apoptosis by directly binding and counteracting Bcl-x(L) antiapoptotic function. In conclusion, our findings suggest a novel mode of action for cisplatin to overcome Bcl-2-mediated protection against apoptosis, which requires preferential activation of Bak and p53-mediated upregulation of Noxa protein levels and lipid peroxidation.
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Affiliation(s)
- Ozgur Kutuk
- Biological Sciences and Bioengineering Program, Sabanci University, 34956 Tuzla, Istanbul, Turkey
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23
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Abstract
The skin is the largest organ of the body and protects the organism against external physical, chemical and biological insults, such as wounding, ultraviolet radiation and micro-organisms. The epidermis is the upper part of the skin that is continuously renewed. The keratinocytes are the major cell type in the epidermis and undergo a specialized form of programmed cell death, called cornification, which is different from classical apoptosis. In keep with this view, several lines of evidence indicate that NF-kB is an important factor providing protection against keratinocyte apoptosis in homeostatic and inflammatory conditions. In contrast, the hair follicle is an epidermal appendage that shows cyclic apoptosis-driven involution, as part of the normal hair cycle. The different cell death programs need to be well orchestrated to maintain skin homeostasis. One of the major environmental insults to the skin is UVB radiation, causing the occurrence of apoptotic sunburn cells. Deregulation of cell death mechanisms in the skin can lead to diseases such as cancer, necrolysis and graft-versus-host disease. Here we review the apoptotic and the anti-apoptotic mechanisms in skin homeostasis and disease.
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Batista LFZ, Roos WP, Kaina B, Menck CFM. p53 mutant human glioma cells are sensitive to UV-C-induced apoptosis due to impaired cyclobutane pyrimidine dimer removal. Mol Cancer Res 2009; 7:237-46. [PMID: 19208740 DOI: 10.1158/1541-7786.mcr-08-0428] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The p53 protein is a key regulator of cell responses to DNA damage, and it has been shown that it sensitizes glioma cells to the alkylating agent temozolomide by up-regulating the extrinsic apoptotic pathway, whereas it increases the resistance to chloroethylating agents, such as ACNU and BCNU, probably by enhancing the efficiency of DNA repair. However, because these agents induce a wide variety of distinct DNA lesions, the direct importance of DNA repair is hard to access. Here, it is shown that the induction of photoproducts by UV light (UV-C) significantly induces apoptosis in a p53-mutated glioma background. This is caused by a reduced level of photoproduct repair, resulting in the persistence of DNA lesions in p53-mutated glioma cells. UV-C-induced apoptosis in p53 mutant glioma cells is preceded by strong transcription and replication inhibition due to blockage by unrepaired photolesions. Moreover, the results indicate that UV-C-induced apoptosis of p53 mutant glioma cells is executed through the intrinsic apoptotic pathway, with Bcl-2 degradation and sustained Bax and Bak up-regulation. Collectively, the data indicate that unrepaired DNA lesions induce apoptosis in p53 mutant gliomas despite the resistance of these gliomas to temozolomide, suggesting that efficiency of treatment of p53 mutant gliomas might be higher with agents that induce the formation of DNA lesions whose global genomic repair is dependent on p53.
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Affiliation(s)
- Luis F Z Batista
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP 05508-900, Brazil
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25
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Lin PW, Huang YJ, John JAC, Chang YN, Yuan CH, Chen WY, Yeh CH, Shen ST, Lin FP, Tsui WH, Chang CY. Iridovirus Bcl-2 protein inhibits apoptosis in the early stage of viral infection. Apoptosis 2008; 13:165-76. [PMID: 17955372 DOI: 10.1007/s10495-007-0152-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The grouper iridovirus (GIV) belongs to the family Iridoviridae, whose genome contains an antiapoptotic B-cell lymphoma (Bcl)-2-like gene. This study was carried-out to understand whether GIV blocks apoptosis in its host. UV-irradiated grouper kidney (GK) cells underwent apoptosis. However, a DNA fragmentation assay of UV-exposed GK cells after GIV infection revealed an inhibition of apoptosis. The UV- or heat-inactivated GIV failed to inhibit apoptosis, implying that a gene or protein of the viral particle might contribute to an apoptosis inhibitory function. The DNA ladder assay for GIV-infected GK cells after UV irradiation confirmed that apoptosis inhibition was an early process which occurred as early as 5 min post-infection. A GIV-Bcl sequence comparison showed distant sequence similarities to that of human and four viruses; however, all possessed the putative Bcl-2 homology (BH) domains of BH1, BH2, BH3, and BH4, as well as a transmembrane domain. Northern blot hybridization showed that GIV-Bcl transcription began at 2 h post-infection, and the mRNA level significantly increased in the presence of cycloheximide or aphidicolin, indicating that this GIV-Bcl is an immediate-early gene. This was consistent with the Western blot results, which also revealed that the virion carries the Bcl protein. We observed the localization of GIV-Bcl on the mitochondrial membrane and other defined intracellular areas. By immunostaining, it was proven that GIV-Bcl-expressing cells effectively inhibited apoptosis. Taken together, these results demonstrate that GIV inhibits the promotion of apoptosis by GK cells, which is mediated by the immediate early expressed viral Bcl gene.
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Affiliation(s)
- Pei-Wen Lin
- Molecular Genetics Laboratory, Rm. 336, Institute of Cellular and Organismic Biology, Academia Sinica, 128 Academia Road Section 2, Nankang, Taipei, Taiwan, ROC
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