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Zacarias O, Clement CC, Cheng SY, Rosas M, Gonzalez C, Peter M, Coopman P, Champeil E. Mitomycin C and its analog trigger cytotoxicity in MCF-7 and K562 cancer cells through the regulation of RAS and MAPK/ERK pathways. Chem Biol Interact 2024; 395:111007. [PMID: 38642817 PMCID: PMC11102841 DOI: 10.1016/j.cbi.2024.111007] [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: 01/23/2024] [Revised: 03/27/2024] [Accepted: 04/14/2024] [Indexed: 04/22/2024]
Abstract
Mitomycin C (MC) is an anti-cancer drug which functions by forming interstrand crosslinks (ICLs) between opposing DNA strands. MC analog, 10-decarbamoyl mitomycin C (DMC), unlike MC, has stronger cytotoxic effects on cancer cells with TP53 mutation. We previously demonstrated that MC/DMC could activate p21WAF1/CIP1 in MCF-7 (TP53-proficient) and K562 (TP53 deficient) cells in a TP53-independent mode. We also found that MC/DMC regulate AKT activation in a TP53-dependent manner and that AKT deactivation is not associated with the activation of p21WAF1/CIP1 in response to MC/DMC treatment. RAS proteins are known players in the upstream mediated signaling of p21WAF1/CIP1 activation that leads to control of cell proliferation and cell death. Thus, this prompted us to investigate the effect of both drugs on the expression of RAS proteins and regulation of the MAPK/ERK signaling pathways in MCF-7 and K562 cancer cells. To accomplish this goal, we performed comparative label free proteomics profiling coupled to bioinformatics/complementary phosphoprotein arrays and Western blot validations of key signaling molecules. The MAPK/ERK pathway exhibited an overall downregulation upon MC/DMC treatment in MCF-7 cells but only DMC exhibited a mild downregulation of that same pathway in TP53 mutant K562 cells. Furthermore, treatment of MCF-7 and K562 cell lines with oligonucleotides containing the interstrand crosslinks (ICLs) formed by MC or DMC shows that both ICLs had a stronger effect on the downregulation of RAS protein expression in mutant TP53 K562 cells. We discuss the implication of this regulation of the MAPK/ERK pathway in relation to cellular TP53 status.
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Affiliation(s)
- Owen Zacarias
- Department of Sciences, John Jay College of Criminal Justice, The City University of New York, New York, NY, 10019, USA
| | - Cristina C Clement
- Radiation Oncology Department, Weill Cornell Medicine, New York, New York, 10065, USA.
| | - Shu-Yuan Cheng
- Department of Sciences, John Jay College of Criminal Justice, The City University of New York, New York, NY, 10019, USA; Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York, New York, NY, 10016, USA.
| | - Melissa Rosas
- Department of Sciences, John Jay College of Criminal Justice, The City University of New York, New York, NY, 10019, USA
| | - Christina Gonzalez
- Department of Sciences, John Jay College of Criminal Justice, The City University of New York, New York, NY, 10019, USA
| | - Marion Peter
- IRCM, University Montpellier, ICM, INSERM, CNRS, Campus Val d'Aurelle, 208 avenue des apothicaires, 34298, Montpellier, Cédex 5, France
| | - Peter Coopman
- IRCM, University Montpellier, ICM, INSERM, CNRS, Campus Val d'Aurelle, 208 avenue des apothicaires, 34298, Montpellier, Cédex 5, France
| | - Elise Champeil
- Department of Sciences, John Jay College of Criminal Justice, The City University of New York, New York, NY, 10019, USA; Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, NY, 10016, USA.
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2
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Lisi L, Pizzoferrato M, Ciotti GMP, Martire M, Navarra P. mTOR Inhibition Is Effective against Growth, Survival and Migration, but Not against Microglia Activation in Preclinical Glioma Models. Int J Mol Sci 2023; 24:9834. [PMID: 37372982 DOI: 10.3390/ijms24129834] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 06/02/2023] [Accepted: 06/03/2023] [Indexed: 06/29/2023] Open
Abstract
Initially introduced in therapy as immunosuppressants, the selective inhibitors of mTORC1 have been approved for the treatment of solid tumors. Novel non-selective inhibitors of mTOR are currently under preclinical and clinical developments in oncology, attempting to overcome some limitations associated with selective inhibitors, such as the development of tumor resistance. Looking at the possible clinical exploitation in the treatment of glioblastoma multiforme, in this study we used the human glioblastoma cell lines U87MG, T98G and microglia (CHME-5) to compare the effects of a non-selective mTOR inhibitor, sapanisertib, with those of rapamycin in a large array of experimental paradigms, including (i) the expression of factors involved in the mTOR signaling cascade, (ii) cell viability and mortality, (iii) cell migration and autophagy, and (iv) the profile of activation in tumor-associated microglia. We could distinguish between effects of the two compounds that were overlapping or similar, although with differences in potency and or/time-course, and effects that were diverging or even opposite. Among the latter, especially relevant is the difference in the profile of microglia activation, with rapamycin being an overall inhibitor of microglia activation, whereas sapanisertib was found to induce an M2-profile, which is usually associated with poor clinical outcomes.
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Affiliation(s)
- Lucia Lisi
- Department of Healthcare Surveillance and Bioethics, Section of Pharmacology, Catholic University Medical School, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
| | - Michela Pizzoferrato
- Department of Healthcare Surveillance and Bioethics, Section of Pharmacology, Catholic University Medical School, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
| | - Gabriella Maria Pia Ciotti
- Department of Healthcare Surveillance and Bioethics, Section of Pharmacology, Catholic University Medical School, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
| | - Maria Martire
- Department of Healthcare Surveillance and Bioethics, Section of Pharmacology, Catholic University Medical School, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
| | - Pierluigi Navarra
- Department of Healthcare Surveillance and Bioethics, Section of Pharmacology, Catholic University Medical School, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
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3
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Hany D, Zoetemelk M, Bhattacharya K, Nowak-Sliwinska P, Picard D. Network-informed discovery of multidrug combinations for ERα+/HER2-/PI3Kα-mutant breast cancer. Cell Mol Life Sci 2023; 80:80. [PMID: 36869202 PMCID: PMC10032341 DOI: 10.1007/s00018-023-04730-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 01/20/2023] [Accepted: 02/19/2023] [Indexed: 03/05/2023]
Abstract
Breast cancer is a persistent threat to women worldwide. A large proportion of breast cancers are dependent on the estrogen receptor α (ERα) for tumor progression. Therefore, targeting ERα with antagonists, such as tamoxifen, or estrogen deprivation by aromatase inhibitors remain standard therapies for ERα + breast cancer. The clinical benefits of monotherapy are often counterbalanced by off-target toxicity and development of resistance. Combinations of more than two drugs might be of great therapeutic value to prevent resistance, and to reduce doses, and hence, decrease toxicity. We mined data from the literature and public repositories to construct a network of potential drug targets for synergistic multidrug combinations. With 9 drugs, we performed a phenotypic combinatorial screen with ERα + breast cancer cell lines. We identified two optimized low-dose combinations of 3 and 4 drugs of high therapeutic relevance to the frequent ERα + /HER2-/PI3Kα-mutant subtype of breast cancer. The 3-drug combination targets ERα in combination with PI3Kα and cyclin-dependent kinase inhibitor 1 (p21). In addition, the 4-drug combination contains an inhibitor for poly (ADP-ribose) polymerase 1 (PARP1), which showed benefits in long-term treatments. Moreover, we validated the efficacy of the combinations in tamoxifen-resistant cell lines, patient-derived organoids, and xenograft experiments. Thus, we propose multidrug combinations that have the potential to overcome the standard issues of current monotherapies.
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Affiliation(s)
- Dina Hany
- Département de Biologie Moléculaire et Cellulaire, Université de Genève, Sciences III, Quai Ernest-Ansermet 30, 1211, Genève 4, Switzerland
- On leave from: Department of Pharmacology and Therapeutics, Faculty of Pharmacy, Pharos University in Alexandria, Alexandria, 21311, Egypt
| | - Marloes Zoetemelk
- Groupe de Pharmacologie Moléculaire, Section des Sciences Pharmaceutiques, Université de Genève, Genève, Switzerland
- Institut des Sciences Pharmaceutiques de Suisse Occidentale, Université de Genève, Genève, Switzerland
- Centre de Recherche Translationnelle en Onco-hématologie, Université de Genève, Genève, Switzerland
| | - Kaushik Bhattacharya
- Département de Biologie Moléculaire et Cellulaire, Université de Genève, Sciences III, Quai Ernest-Ansermet 30, 1211, Genève 4, Switzerland
| | - Patrycja Nowak-Sliwinska
- Groupe de Pharmacologie Moléculaire, Section des Sciences Pharmaceutiques, Université de Genève, Genève, Switzerland
- Institut des Sciences Pharmaceutiques de Suisse Occidentale, Université de Genève, Genève, Switzerland
- Centre de Recherche Translationnelle en Onco-hématologie, Université de Genève, Genève, Switzerland
| | - Didier Picard
- Département de Biologie Moléculaire et Cellulaire, Université de Genève, Sciences III, Quai Ernest-Ansermet 30, 1211, Genève 4, Switzerland.
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4
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Fujisaki T, Saito K, Kikuchi T, Kondo E. The prolyl hydroxylase OGFOD1 promotes cancer cell proliferation by regulating the expression of cell cycle regulators. FEBS Lett 2022; 597:1073-1085. [PMID: 36464654 DOI: 10.1002/1873-3468.14547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 11/10/2022] [Accepted: 11/13/2022] [Indexed: 12/12/2022]
Abstract
OGFOD1, a prolyl-hydroxylase, has been reported to translocate from the nucleus to the cytoplasm in response to cellular stress. Here, we demonstrate that OGFOD1 regulates the transcription and post-transcriptional stabilization of cell cycle-related genes. OGFOD1 knockdown in lung cancer cells induced cell cycle arrest through the specific depletion of cyclin-dependent kinase (CDK) 1, CDK2 and cyclin B1 (CCNB1) mRNAs and the nuclear accumulation of p21Cip1 . Analysis of the mRNA dynamics in these cells revealed that CDK1 decreased in a time-dependent manner, reflecting post-transcriptional regulation by OGFOD1 and the RNA-binding protein HuR. In contrast, the depletion of CDK2 and CCNB1 resulted from decreased transcription mediated by OGFOD1. These results indicate that OGFOD1 is required to maintain the function of specific cell cycle regulators during cancer cell proliferation.
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Affiliation(s)
- Toshiya Fujisaki
- Division of Molecular and Cellular Pathology, Niigata University Graduate School of Medical and Dental Sciences, Japan.,Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Japan
| | - Ken Saito
- Department of Clinical Engineering and Medical Technology, Niigata University of Health and Welfare, Japan
| | - Toshiaki Kikuchi
- Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Japan
| | - Eisaku Kondo
- Division of Molecular and Cellular Pathology, Niigata University Graduate School of Medical and Dental Sciences, Japan.,Division of Tumor Pathology, Near Infrared Photo-Immunotherapy Research Institute, Kansai Medical University, Osaka, Japan
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5
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Huang M, Liu C, Shao Y, Zhou S, Hu G, Yin S, Pu W, Yu H. Anti-tumor pharmacology of natural products targeting mitosis. Cancer Biol Med 2022; 19:j.issn.2095-3941.2022.0006. [PMID: 35699421 PMCID: PMC9257311 DOI: 10.20892/j.issn.2095-3941.2022.0006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Cancer has been an insurmountable problem in the history of medical science. The uncontrollable proliferation of cancer cells is one of cancer’s main characteristics, which is closely associated with abnormal mitosis. Targeting mitosis is an effective method for cancer treatment. This review summarizes several natural products with anti-tumor effects related to mitosis, focusing on targeting microtubulin, inducing DNA damage, and modulating mitosis-associated kinases. Furthermore, the main disadvantages of several typical compounds, including drug resistance, toxicity to non-tumor tissues, and poor aqueous solubility and pharmacokinetic properties, are also discussed, together with strategies to address them. Improved understanding of cancer cell mitosis and natural products may pave the way to drug development for the treatment of cancer.
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Affiliation(s)
- Manru Huang
- Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.,State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Caiyan Liu
- Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.,State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Yingying Shao
- Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.,State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Shiyue Zhou
- Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.,State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Gaoyong Hu
- Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.,State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Shuangshuang Yin
- Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.,State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Weiling Pu
- Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.,State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Haiyang Yu
- Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.,State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
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6
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Pivotal role of PIM2 kinase in plasmablast generation and plasma cell survival, opening new treatment options in myeloma. Blood 2022; 139:2316-2337. [PMID: 35108359 DOI: 10.1182/blood.2021014011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 01/14/2022] [Indexed: 11/20/2022] Open
Abstract
The differentiation of B cells into plasmablasts (PBs) and then plasma cells (PCs) is associated with extensive cell reprogramming and new cell functions. By using specific inhibition strategies (including a novel morpholino RNA antisense approach), we found that early, sustained upregulation of the proviral integrations of Moloney virus 2 (PIM2) kinase is a pivotal event during human B cell in vitro differentiation and then continues in mature normal and malignant PCs in the bone marrow. In particular, PIM2 sustained the G1/S transition by acting on CDC25A and p27Kip1 and hindering caspase 3-driven apoptosis through BAD phosphorylation and cytoplasmic stabilization of p21Cip1. In PCs, interleukin-6 triggered PIM2 expression, resulting in anti-apoptotic effects on which malignant PCs were particularly dependent. In multiple myeloma, pan-PIM and MCL1 inhibitors displayed synergistic activity. Our results highlight a cell-autonomous function that links kinase activity to the PBs' newly acquired secretion ability and the adaptability observed in both normal and malignant PCs, and finally should prompt the reconsideration of PIM2 as a therapeutic target in multiple myeloma.
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7
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Zhao L, Zhang M, Pan F, Li J, Dou R, Wang X, Wang Y, He Y, Wang S, Cai S. In silico analysis of novel dipeptidyl peptidase-IV inhibitory peptides released from Macadamia integrifolia antimicrobial protein 2 (MiAMP2) and the possible pathways involved in diabetes protection. Curr Res Food Sci 2021; 4:603-611. [PMID: 34522898 PMCID: PMC8424447 DOI: 10.1016/j.crfs.2021.08.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/14/2021] [Accepted: 08/23/2021] [Indexed: 02/06/2023] Open
Abstract
The aim of the present study was to screen novel dipeptidyl peptidase IV (DPP-IV) inhibitory peptides from Macadamia integrifolia antimicrobial protein 2 (MiAMP2) and evaluate the potential antidiabetic targets and involved signaling pathways using in silico approaches. In silico digestion of MiAMP2 with pepsin, trypsin and chymotrypsin was performed with ExPASy PeptideCutter and the generated peptides were subjected to BIOPEP-UWM, iDrug, INNOVAGEN and Autodock Vina for further analyses. Six novel peptides EQVR, EQVK, AESE, EEDNK, EECK, and EVEE were predicted to possess good DPP-IV inhibitory potentials, water solubility, and absorption, distribution, metabolism, excretion, and toxicity properties. Molecular dynamic simulation and molecular docking displayed that AESE was the most potent DPP-IV inhibitory peptide and can bind with the active sites of DPP-IV through hydrogen bonding and van der Waals forces. The potential antidiabetic targets of AESE were retrieved from SwissTargetPrediction and GeneCards databases. Protein-protein interaction analysis identified BIRC2, CASP3, MMP7 and BIRC3 to be the hub targets. Moreover, the KEGG pathway enrichment analysis showed that AESE prevented diabetes through the apoptosis and TNF signaling pathways. These results will provide new insights into utilization of MiAMP2 as functional food ingredients for the prevention and treatment of diabetes.
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Affiliation(s)
- Lei Zhao
- Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University, Beijing, 100048, China
| | - Mingxin Zhang
- Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University, Beijing, 100048, China
| | - Fei Pan
- Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University, Beijing, 100048, China
| | - Jiayi Li
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Ran Dou
- Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University, Beijing, 100048, China
| | - Xinyi Wang
- Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University, Beijing, 100048, China
| | - Yangyang Wang
- Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University, Beijing, 100048, China
| | - Yumeng He
- Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University, Beijing, 100048, China
| | - Shaoxuan Wang
- Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University, Beijing, 100048, China
| | - Shengbao Cai
- Faculty of Agriculture and Food, Yunnan Institute of Food Safety, Kunming University of Science and Technology, Kunming, 650500, Yunnan, China
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8
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Gris-Oliver A, Ibrahim YH, Rivas MA, García-García C, Sánchez-Guixé M, Ruiz-Pace F, Viaplana C, Pérez-García JM, Llombart-Cussac A, Grueso J, Parés M, Guzmán M, Rodríguez O, Anton P, Cozar P, Calvo MT, Bruna A, Arribas J, Caldas C, Dienstmann R, Nuciforo P, Oliveira M, Cortés J, Serra V. PI3K activation promotes resistance to eribulin in HER2-negative breast cancer. Br J Cancer 2021; 124:1581-1591. [PMID: 33723394 PMCID: PMC8076303 DOI: 10.1038/s41416-021-01293-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 01/18/2021] [Accepted: 01/28/2021] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Eribulin is a microtubule-targeting agent approved for the treatment of advanced or metastatic breast cancer (BC) previously treated with anthracycline- and taxane-based regimens. PIK3CA mutation is associated with worse response to chemotherapy in oestrogen receptor-positive (ER+)/human epidermal growth factor receptor 2-negative (HER2-) metastatic BC. We aimed to evaluate the role of phosphoinositide 3-kinase (PI3K)/AKT pathway mutations in eribulin resistance. METHODS Resistance to eribulin was evaluated in HER2- BC cell lines and patient-derived tumour xenografts, and correlated with a mutation in the PI3K/AKT pathway. RESULTS Eleven out of 23 HER2- BC xenografts treated with eribulin exhibited disease progression. No correlation with ER status was detected. Among the resistant models, 64% carried mutations in PIK3CA, PIK3R1 or AKT1, but only 17% among the sensitive xenografts (P = 0.036). We observed that eribulin treatment induced AKT phosphorylation in vitro and in patient tumours. In agreement, the addition of PI3K inhibitors reversed primary and acquired resistance to eribulin in xenograft models, regardless of the genetic alterations in PI3K/AKT pathway or ER status. Mechanistically, PI3K blockade reduced p21 levels likely enabling apoptosis, thus sensitising to eribulin treatment. CONCLUSIONS PI3K pathway activation induces primary resistance or early adaptation to eribulin, supporting the combination of PI3K inhibitors and eribulin for the treatment of HER2- BC patients.
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Affiliation(s)
- Albert Gris-Oliver
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Yasir H Ibrahim
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Martín A Rivas
- Department of Medicine, Weil Cornell Medicine, New York, NY, USA
| | - Celina García-García
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Mònica Sánchez-Guixé
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Fiorella Ruiz-Pace
- Oncology Data Science (ODysSey Group), Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Cristina Viaplana
- Oncology Data Science (ODysSey Group), Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - José M Pérez-García
- Department of Medical Oncology, Hospital Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
- Medica Scientia Innovation Research (MedSIR), Barcelona, Spain
- Medica Scientia Innovation Research (MedSIR), Ridgewood, NJ, USA
- Breast Cancer Program, Quironsalud Group, Institute of Oncology (IOB), Barcelona, Spain
- Breast Cancer Program, Quironsalud Group, Institute of Oncology (IOB), Madrid, Spain
| | - Antonio Llombart-Cussac
- Medica Scientia Innovation Research (MedSIR), Barcelona, Spain
- Medica Scientia Innovation Research (MedSIR), Ridgewood, NJ, USA
| | - Judit Grueso
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Mireia Parés
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Marta Guzmán
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Olga Rodríguez
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Pilar Anton
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Patricia Cozar
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Maria Teresa Calvo
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Alejandra Bruna
- Preclinical Modelling of Paediatric Cancer Evolution Team, Institute of Cancer Research, Sutton, UK
| | - Joaquín Arribas
- Growth Factors Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
- Department of Biochemistry and Molecular Biology, Universitat Autònoma de Barcelona, Campus de la UAB, Bellaterra, Spain
- Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
- CIBERONC, Instituto de Salud Carlos III, Madrid, Spain
| | - Carlos Caldas
- Department of Oncology and Cancer Research UK Cambridge Institute, Li Ka Shing Centre, University of Cambridge, Cambridge, UK
- Cambridge Breast Unit, NIHR Cambridge Biomedical Research Centre and Cambridge Experimental Cancer Medicine Centre at Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Rodrigo Dienstmann
- Oncology Data Science (ODysSey Group), Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Paolo Nuciforo
- CIBERONC, Instituto de Salud Carlos III, Madrid, Spain
- Molecular Oncology Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Mafalda Oliveira
- Department of Medical Oncology, Hospital Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
- Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Javier Cortés
- Medica Scientia Innovation Research (MedSIR), Barcelona, Spain.
- Medica Scientia Innovation Research (MedSIR), Ridgewood, NJ, USA.
- Breast Cancer Program, Quironsalud Group, Institute of Oncology (IOB), Barcelona, Spain.
- Breast Cancer Program, Quironsalud Group, Institute of Oncology (IOB), Madrid, Spain.
- Breast Cancer GroupVall d'Hebron Institute of Oncology, Barcelona, Spain.
| | - Violeta Serra
- Experimental Therapeutics Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain.
- CIBERONC, Instituto de Salud Carlos III, Madrid, Spain.
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9
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Gonzalez-Rajal A, Hastings JF, Watkins DN, Croucher DR, Burgess A. Breathing New Life into the Mechanisms of Platinum Resistance in Lung Adenocarcinoma. Front Cell Dev Biol 2020; 8:305. [PMID: 32457904 PMCID: PMC7225257 DOI: 10.3389/fcell.2020.00305] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 04/07/2020] [Indexed: 12/25/2022] Open
Affiliation(s)
| | - Jordan F. Hastings
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - D. Neil Watkins
- Research Institute in Oncology and Hematology, Cancer Care Manitoba, Winnipeg, MB, Canada
- Department of Internal Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - David R. Croucher
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Sydney, NSW, Australia
- St Vincent's Hospital Clinical School, University of New South Wales, Sydney, NSW, Australia
| | - Andrew Burgess
- ANZAC Research Institute, Concord, NSW, Australia
- The University of Sydney Concord Clinical School, Faculty of Medicine and Health, Sydney, NSW, Australia
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10
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Leu WJ, Wang CT, Hsu JL, Chen IS, Chang HS, Guh JH. Ascleposide, a natural cardenolide, induces anticancer signaling in human castration-resistant prostatic cancer through Na + /K + -ATPase internalization and tubulin acetylation. Prostate 2020; 80:305-318. [PMID: 31905252 DOI: 10.1002/pros.23944] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 12/11/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND Cardiac glycosides, which inhibit Na+ /K+ -ATPase, display inotropic effects for the treatment of congestive heart failure and cardiac arrhythmia. Recent studies have suggested signaling downstream of Na+ /K+ -ATPase action in the regulation of cell proliferation and apoptosis and have revealed the anticancer activity of cardiac glycosides. The study aims to characterize the anticancer potential of ascleposide, a natural cardenolide, and to uncover its primary target and underlying mechanism against human castration-resistant prostate cancer (CRPC). METHODS Cell proliferation was examined in CRPC PC-3 and DU-145 cells using sulforhodamine B assay, carboxyfluorescein succinimidyl ester staining assay and clonogenic examination. Flow cytometric analysis was used to detect the distribution of cell cycle phase, mitochondrial membrane potential, intracellular Na+ and Ca2+ levels, and reactive oxygen species production. Protein expression was examined using Western blot analysis. Endocytosis of Na+ /K+ -ATPase was determined using confocal immunofluorescence microscopic examination. RESULTS Ascleposide induced an increase of intracellular Na+ and a potent antiproliferative effect. It also induced a decrease of G1 phase distribution while an increase in both G2/M and apoptotic sub-G1 phases, and downregulated several cell cycle regulator proteins, including cyclins, Cdk, p21, and p27 Cip/Kip proteins, Rb and c-Myc. Ascleposide decreased the expression of antiapoptotic Bcl-2 members (eg, Bcl-2 and Mcl-1) but upregulated proapoptotic member (eg, Bak), leading to a significant loss of mitochondrial membrane potential and activation of both caspase-9 and caspase-3. Ascleposide also dramatically induced tubulin acetylation, leading to inhibition of the catalytic activity of Na+ /K+ -ATPase. Notably, extracellular high K+ (16 mM) significantly blunted ascleposide-mediated effects. Furthermore, ascleposide induced a p38 MAPK-dependent endocytosis of Na+ /K+ -ATPase and downregulated the protein expression of Na+ /K+ -ATPase α1 subunit. CONCLUSION Ascleposide displays antiproliferative and apoptotic activities dependent on the inhibition of Na+ /K+ -ATPase pumping activity through p38 MAPK-mediated endocytosis of Na+ /K+ -ATPase and downregulation of α1 subunit, which in turn cause tubulin acetylation and cell cycle arrest. Cell apoptosis is ultimately triggered by the activation of caspase cascade attributed to mitochondrial damage through the downregulation of Bcl-2 and Mcl-1 protein expressions while upregulation of Bak protein levels. The data also suggest the potential of ascleposide in anti-CRPC development.
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Affiliation(s)
- Wohn-Jenn Leu
- School of Pharmacy, National Taiwan University, Taipei, Taiwan
| | - Ching-Ting Wang
- School of Pharmacy, National Taiwan University, Taipei, Taiwan
| | - Jui-Ling Hsu
- School of Pharmacy, National Taiwan University, Taipei, Taiwan
| | - Ih-Sheng Chen
- School of Pharmacy, College of Pharmacy, Kaohsiung, Taiwan, Kaohsiung, Taiwan
| | - Hsun-Shuo Chang
- School of Pharmacy, College of Pharmacy, Kaohsiung, Taiwan, Kaohsiung, Taiwan
- Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Jih-Hwa Guh
- School of Pharmacy, National Taiwan University, Taipei, Taiwan
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11
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Chen KHE, Bustamante K, Nguyen V, Walker AM. Involvement of miR-106b in tumorigenic actions of both prolactin and estradiol. Oncotarget 2018; 8:36368-36382. [PMID: 28422740 PMCID: PMC5482661 DOI: 10.18632/oncotarget.16755] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Accepted: 03/21/2017] [Indexed: 02/07/2023] Open
Abstract
Prolactin promotes a variety of cancers by an array of different mechanisms. Here, we have investigated prolactin's inhibitory effect on expression of the cell cycle-regulating protein, p21. Using a miRNA array, we identified a number of miRNAs upregulated by prolactin treatment, but one in particular that was strongly induced by prolactin and predicted to bind to the 3′UTR of p21 mRNA, miR-106b. By creating a p21 mRNA 3′UTR-luciferase mRNA construct, we demonstrated degradation of the construct in response to prolactin in human breast, prostate and ovarian cancer cell lines. Increased expression of miR-106b replicated, and anti-miR-106b counteracted, the effects of prolactin on degradation of the 3′UTR construct, p21 mRNA levels, and cell proliferation in breast (T47D) and prostate (PC3) cancer cells. Increased expression of miR-106b also stimulated migration of the very epithelioid T47D cell line. By contrast, anti-miR-106b dramatically decreased expression of the mesenchymal markers, SNAIL-2, TWIST-2, VIMENTIN, and FIBRONECTIN. Using signaling pathway inhibitors and the 3′UTR construct, induction of miR-106b by prolactin was determined to be mediated through the MAPK/ERK and PI3K/Akt pathways and not through Jak2/Stat5 in both T47D and PC3 cells. Prolactin activation of MAPK/ERK and PI3K/Akt also activates ERα in the absence of an ERα ligand. 17β-estradiol promoted degradation of the construct in both cell lines and pre-incubation in the estrogen antagonist, Fulvestrant, blocked the ability of both prolactin and 17β-estradiol to induce the construct-degrading activity. Together, these data support a convergence of the prolactin and 17β-estradiol miR-106b-elevating signaling pathways at ERα.
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Affiliation(s)
- Kuan-Hui Ethan Chen
- Division of Biomedical Sciences, University of California, Riverside, CA 92521, USA
| | - Karissa Bustamante
- Division of Biomedical Sciences, University of California, Riverside, CA 92521, USA
| | - Vi Nguyen
- Division of Biomedical Sciences, University of California, Riverside, CA 92521, USA
| | - Ameae M Walker
- Division of Biomedical Sciences, University of California, Riverside, CA 92521, USA
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12
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Bressy C, Majhen D, Raddi N, Jdey W, Cornilleau G, Zig L, Guirouilh-Barbat J, Lopez BS, Bawa O, Opolon P, Grellier E, Benihoud K. Combined therapy of colon carcinomas with an oncolytic adenovirus and valproic acid. Oncotarget 2017; 8:97344-97360. [PMID: 29228615 PMCID: PMC5722567 DOI: 10.18632/oncotarget.22107] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Accepted: 08/04/2017] [Indexed: 12/27/2022] Open
Abstract
The anti-tumor potential of oncolytic adenoviruses (CRAds) has been demonstrated in preclinical and clinical studies. While these agents failed to eradicate tumors when used as a monotherapy, they may be more effective if combined with conventional treatments such as radiotherapy or chemotherapy. This study seeks to evaluate the combination of a CRAd bearing a ∆24 deletion in E1A with valproic acid (VPA), a histone deacetylase inhibitor, for the treatment of human colon carcinomas. This combination led to a strong inhibition of cell growth both in vitro and in vivo compared to treatment with CRAd or VPA alone. This effect did not stem from a better CRAd replication and production in the presence of VPA. Inhibition of cell proliferation and cell death were induced by the combined treatment. Moreover, whereas cells treated only with CRAd displayed a polyploidy (> 4N population), this phenotype was increased in cells treated with both CRAd and VPA. In addition, the increase in polyploidy triggered by combined treatment with CRAd and VPA was associated with the enhancement of H2AX phosphorylation (γH2AX), a hallmark of DNA damage, but also with a decrease of several DNA repair proteins. Finally, viral replication (or E1A expression) was shown to play a key role in the observed effects since no enhancement of polyploidy nor increase in γH2AX were found following cell treatment with a replication-deficient Ad and VPA. Taken together, our results suggest that CRAd and VPA could be used in combination for the treatment of colon carcinomas.
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Affiliation(s)
- Christian Bressy
- Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203 CNRS, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
| | - Dragomira Majhen
- Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203 CNRS, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
| | - Najat Raddi
- Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203 CNRS, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
| | - Wael Jdey
- Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203 CNRS, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
| | - Gaétan Cornilleau
- Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203 CNRS, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
| | - Léna Zig
- Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203 CNRS, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
| | - Josée Guirouilh-Barbat
- Laboratoire Recombinaison-Réparation et Cancer, UMR 8200 CNRS Stabilité Génétique et Oncogenèse, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
| | - Bernard S Lopez
- Laboratoire Recombinaison-Réparation et Cancer, UMR 8200 CNRS Stabilité Génétique et Oncogenèse, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
| | - Olivia Bawa
- Unité de pathologie expérimentale de l'IRCIV, Gustave Roussy, Villejuif 94805, France
| | - Paule Opolon
- Unité de pathologie expérimentale de l'IRCIV, Gustave Roussy, Villejuif 94805, France
| | - Elodie Grellier
- Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203 CNRS, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
| | - Karim Benihoud
- Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203 CNRS, Université Paris-Sud, Gustave Roussy, Université Paris-Saclay, Villejuif 94805, France
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13
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Kang SH, Hwang IH, Son E, Cho CK, Choi JS, Park SJ, Jang BC, Lee KB, Lee ZW, Lee JH, Yoo HS, Jang IS. Allergen-Removed Rhus verniciflua Extract Induces Ovarian Cancer Cell Death via JNK Activation. THE AMERICAN JOURNAL OF CHINESE MEDICINE 2016; 44:1719-1735. [PMID: 27848251 DOI: 10.1142/s0192415x16500968] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Nuclear factor-[Formula: see text]B (NF-[Formula: see text]B)/Rel transcription factors are best known for their central roles in promoting cell survival in cancer. NF-[Formula: see text]B antagonizes tumor necrosis factor (TNF)-[Formula: see text]-induced apoptosis through a process involving attenuation of the c-Jun-N-terminal kinase (JNK). However, the role of JNK activation in apoptosis induced by negative regulation of NF-[Formula: see text]B is not completely understood. We found that allergen-removed Rhus verniciflua Stokes (aRVS) extract-mediated NF-[Formula: see text]B inhibition induces apoptosis in SKOV-3 ovarian cancer cells via the serial activation of caspases and SKOV-3 cells are most specifically suppressed by aRVS. Here, we show that in addition to activating caspases, aRVS extract negatively modulates the TNF-[Formula: see text]-mediated I[Formula: see text]B/NF-[Formula: see text]B pathway to promote JNK activation, which results in apoptosis. When the cytokine TNF-[Formula: see text] binds to the TNF receptor, I[Formula: see text]B dissociates from NF-[Formula: see text]B. As a result, the active NF-[Formula: see text]B translocates to the nucleus. aRVS extract (0.5[Formula: see text]mg/ml) clearly prevented NF-[Formula: see text]B from mobilizing to the nucleus, resulting in the upregulation of JNK phosphorylation. This subsequently increased Bax activation, leading to marked aRVS-induced apoptosis, whereas the JNK inhibitor SP600125 in aRVS extract treated SKOV-3 cells strongly inhibited Bax. Bax subfamily proteins induced apoptosis through caspase-3. Thus, these results indicate that aRVS extract contains components that inhibit NF-[Formula: see text]B signaling to upregulate JNK activation in ovarian cancer cells and support the potential of aRVS as a therapeutic agent for ovarian cancer.
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Affiliation(s)
- Se-Hui Kang
- * Division of Bioconvergence, Korea Basic Science Institute, Daejeon 305-333, Republic of Korea
| | - In-Hu Hwang
- † Department of Physiology, Korea University College of Medicine, Seoul 02841, Republic of Korea
| | - Eunju Son
- ‡ Graduate School of Analytical Science and Technology, Chungnam National University, Daejeon 305-764, Korea
| | - Chong-Kwan Cho
- § East-West Cancer Center, Daejeon University, Daejeon 302-120, Republic of Korea
| | - Jong-Soon Choi
- * Division of Bioconvergence, Korea Basic Science Institute, Daejeon 305-333, Republic of Korea.,‡ Graduate School of Analytical Science and Technology, Chungnam National University, Daejeon 305-764, Korea
| | - Soo-Jung Park
- ¶ Department of Sasang Constitutional Medicine, College of Korean Medicine, Woosuk University, Wanju, Jeonbuk, 55338, Republic of Korea
| | - Byeong-Churl Jang
- ∥ Department of Molecular Medicine, College of Medicine, Keimyung University, Daegu 704-701, Republic of Korea
| | - Kyung-Bok Lee
- * Division of Bioconvergence, Korea Basic Science Institute, Daejeon 305-333, Republic of Korea
| | - Zee-Won Lee
- * Division of Bioconvergence, Korea Basic Science Institute, Daejeon 305-333, Republic of Korea
| | - Jong Hoon Lee
- ** Department of Integrative Cancer Center, Woosuk Korean Medicine Hospital, Woosuk University, Jeonju 560-833, Republic of Korea
| | - Hwa-Seung Yoo
- § East-West Cancer Center, Daejeon University, Daejeon 302-120, Republic of Korea
| | - Ik-Soon Jang
- * Division of Bioconvergence, Korea Basic Science Institute, Daejeon 305-333, Republic of Korea
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14
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Lentivirus-mediated p21/Waf-1 short hairpin RNA enhances the cytotoxic effects and replicative potential of a bladder cancer-specific oncolytic adenovirus in vitro. Anticancer Drugs 2016; 28:88-96. [PMID: 27622605 DOI: 10.1097/cad.0000000000000433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Our previous work confirmed that the bladder cancer-specific oncolytic adenovirus Ad/PSCAE/UPII/E1A could selectively replicate in bladder cancer cells, thus causing specific tumor cell lysis. The replicative potential is a crucial factor in determining the therapeutic efficacy of oncolytic adenoviruses. However, viral replication is attenuated by the low-activity promoter that we used, thus compromising viral cytotoxicity. In this study, we investigated the effect of the cell cycle-dependent kinase inhibitor p21/Waf-1 on an adenovirus. We used lentivirus-mediated short hairpin RNA to knock down p21/Waf-1 in two bladder cancer cell lines EJ and 5637. The p21/Waf-1 knockdown not only induced stronger cytopathic effects but also augmented apoptosis, which was closely associated with the enhancement of Fas and the subsequent significant activation of caspase-3. A replicative assay showed that p21/Waf-1 knockdown increased the viral particle production. Western blot analysis confirmed that p21/Waf-1 knockdown upregulated the expression of androgen receptor (AR) and two adenovirus replication indicators E1A and hexon. A luciferase activity assay indicated higher transcriptional activity of the uroplakin II (UPII) promoter in the p21/Waf-1 knockdown cells, and one possible mechanism could be that the increased expression of AR induced the UPII promoter through the AR-binding sites of the prostate stem cell antigen enhancer. These findings indicating that p21/Waf-1 knockdown could enhance cell killing and viral replication have significant implications for the development of bladder cancer-specific oncolytic adenovirus therapies.
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15
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Davies C, Hogarth LA, Mackenzie KL, Hall AG, Lock RB. p21(WAF1) modulates drug-induced apoptosis and cell cycle arrest in B-cell precursor acute lymphoblastic leukemia. Cell Cycle 2015; 14:3602-12. [PMID: 26506264 PMCID: PMC4825786 DOI: 10.1080/15384101.2015.1100774] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 09/21/2015] [Accepted: 09/22/2015] [Indexed: 10/22/2022] Open
Abstract
p21(WAF1) is a well-characterized mediator of cell cycle arrest and may also modulate chemotherapy-induced cell death. The role of p21(WAF1) in drug-induced cell cycle arrest and apoptosis of acute lymphoblastic leukemia (ALL) cells was investigated using p53-functional patient-derived xenografts (PDXs), in which p21(WAF1) was epigenetically silenced in T-cell ALL (T-ALL), but not in B-cell precursor (BCP)-ALL PDXs. Upon exposure to diverse cytotoxic drugs, T-ALL PDX cells exhibited markedly increased caspase-3/7 activity and phosphatidylserine (PS) externalization on the plasma membrane compared with BCP-ALL cells. Despite dramatic differences in apoptotic characteristics between T-ALL and BCP-ALL PDXs, both ALL subtypes exhibited similar cell death kinetics and were equally sensitive to p53-inducing drugs in vitro, although T-ALL PDXs were significantly more sensitive to the histone deacetylase inhibitor vorinostat. Transient siRNA suppression of p21(WAF1) in the BCP-ALL 697 cell line resulted in a moderate depletion of the cell fraction in G1 phase and marked increase in PS externalization following exposure to etoposide. Furthermore, stable lentiviral p21(WAF1) silencing in the BCP-ALL Nalm-6 cell line accelerated PS externalization and cell death following exposure to etoposide and vorinostat, supporting previous findings. Finally, the Sp1 inhibitor, terameprocol, inhibited p21(WAF1) expression in Nalm-6 cells exposed to vorinostat and also partially augmented vorinostat-induced cell death. Taken together, these findings demonstrate that p21(WAF1) regulates the early stages of drug-induced apoptosis in ALL cells and significantly modulates their sensitivity to vorinostat.
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Affiliation(s)
- Carwyn Davies
- Children's Cancer Institute; Lowy Cancer Research Centre; UNSW Australia; Sydney, NSW, Australia
- Clinical Pharmacology Modeling and Simulation; GlaxoSmithKline R&D; Sydney, Australia
| | - Linda A Hogarth
- Northern Institute for Cancer Research; Newcastle University; Newcastle upon Tyne; Tyne and Wear, UK
| | - Karen L Mackenzie
- Children's Cancer Institute; Lowy Cancer Research Centre; UNSW Australia; Sydney, NSW, Australia
| | - Andrew G Hall
- Northern Institute for Cancer Research; Newcastle University; Newcastle upon Tyne; Tyne and Wear, UK
| | - Richard B Lock
- Children's Cancer Institute; Lowy Cancer Research Centre; UNSW Australia; Sydney, NSW, Australia
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16
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Wettersten HI, Landesman Y, Friedlander S, Shacham S, Kauffman M, Weiss RH. Specific inhibition of the nuclear exporter exportin-1 attenuates kidney cancer growth. PLoS One 2014; 9:e113867. [PMID: 25461627 PMCID: PMC4252068 DOI: 10.1371/journal.pone.0113867] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Accepted: 10/31/2014] [Indexed: 12/11/2022] Open
Abstract
PURPOSE Despite the advent of FDA-approved therapeutics to a limited number of available targets (kinases and mTOR), PFS of kidney cancer (RCC) has been extended only one to two years due to the development of drug resistance. Here, we evaluate a novel therapeutic for RCC which targets the exportin-1 (XPO1) inhibitor. MATERIALS AND METHODS RCC cells were treated with the orally available XPO1 inhibitor, KPT-330, and cell viability and Annexin V (apoptosis) assays, and cell cycle analyses were performed to evaluate the efficacy of KPT-330 in two RCC cell lines. Immunoblotting and immunofluorescence analysis were performed to validate mechanisms of XPO1 inhibition. The efficacy and on-target effects of KPT-330 were further analyzed in vivo in RCC xenograft mice, and KPT-330-resistant cells were established to evaluate potential mechanisms of KPT-330 resistance. RESULTS KPT-330 attenuated RCC viability through growth inhibition and apoptosis induction both in vitro and in vivo, a process in which increased nuclear localization of p21 by XPO1 inhibition played a major role. In addition, KPT-330 resistant cells remained sensitive to the currently approved for RCC multi-kinase inhibitors (sunitinib, sorafenib) and mTOR inhibitors (everolimus, temsirolimus), suggesting that these targeted therapeutics would remain useful as second line therapeutics following KPT-330 treatment. CONCLUSION The orally-available XPO1 inhibitor, KPT-330, represents a novel target for RCC whose in vivo efficacy approaches that of sunitinib. In addition, cells resistant to KPT-330 retain their ability to respond to available RCC therapeutics suggesting a novel approach for treatment in KPT-330-naïve as well as -resistant RCC patients.
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MESH Headings
- Active Transport, Cell Nucleus
- Administration, Oral
- Animals
- Apoptosis/drug effects
- Carcinoma, Renal Cell/drug therapy
- Carcinoma, Renal Cell/metabolism
- Carcinoma, Renal Cell/pathology
- Cell Cycle Checkpoints/drug effects
- Cell Line, Tumor
- Cell Nucleus/drug effects
- Cell Nucleus/metabolism
- Cell Proliferation/drug effects
- Cell Survival/drug effects
- Cyclin-Dependent Kinase Inhibitor p21/metabolism
- Drug Approval
- Drug Resistance, Neoplasm/drug effects
- Epithelial Cells/drug effects
- Epithelial Cells/metabolism
- Humans
- Hydrazines/administration & dosage
- Hydrazines/pharmacology
- Karyopherins/antagonists & inhibitors
- Karyopherins/metabolism
- Kidney Neoplasms/drug therapy
- Kidney Neoplasms/metabolism
- Kidney Neoplasms/pathology
- Male
- Mice, Nude
- RNA, Small Interfering/metabolism
- Receptors, Cytoplasmic and Nuclear/antagonists & inhibitors
- Receptors, Cytoplasmic and Nuclear/metabolism
- Triazoles/administration & dosage
- Triazoles/pharmacology
- United States
- United States Food and Drug Administration
- Xenograft Model Antitumor Assays
- Exportin 1 Protein
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Affiliation(s)
- Hiromi I. Wettersten
- Division of Nephrology, Dept. of Internal Medicine, University of California Davis, Davis, California, United States of America
| | - Yosef Landesman
- Karyopharm Therapeutics Inc., Natick, Massachusetts, United States of America
| | - Sharon Friedlander
- Karyopharm Therapeutics Inc., Natick, Massachusetts, United States of America
| | - Sharon Shacham
- Karyopharm Therapeutics Inc., Natick, Massachusetts, United States of America
| | - Michael Kauffman
- Karyopharm Therapeutics Inc., Natick, Massachusetts, United States of America
| | - Robert H. Weiss
- Division of Nephrology, Dept. of Internal Medicine, University of California Davis, Davis, California, United States of America
- Cancer Center, University of California Davis, Davis, California, United States of America
- Medical Service, Sacramento VA Medical Center, Sacramento, California, United States of America
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17
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Carrillo García C, Riedt T, Li J, Dotten M, Brossart P, Janzen V. Simultaneous deletion of p21Cip1/Waf1 and caspase-3 accelerates proliferation and partially rescues the differentiation defects of caspase-3 deficient hematopoietic stem cells. PLoS One 2014; 9:e109266. [PMID: 25286245 PMCID: PMC4186822 DOI: 10.1371/journal.pone.0109266] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 09/07/2014] [Indexed: 11/19/2022] Open
Abstract
Specialized blood cells are generated through the entire life of an organism by differentiation of a small number of hematopoietic stem cells (HSC). There are strictly regulated mechanisms assuring a constant and controlled production of mature blood cells. Although such mechanisms are not completely understood, some factors regulating cell cycle and differentiation have been identified. We have previously shown that Caspase-3 is an important regulator of HSC homeostasis and cytokine responsiveness. p21cip1/waf1 is a known cell cycle regulator, however its role in stem cell homeostasis seems to be limited. Several reports indicate interactions between p21cip1/waf1 and Caspase-3 in a cell type dependent manner. Here we studied the impact of simultaneous depletion of both factors on HSC homeostasis. Depletion of both Caspase-3 and p21cip1/waf1 resulted in an even more pronounced increase in the frequency of hematopoietic stem and progenitor cells. In addition, simultaneous deletion of both genes revealed a further increase of cell proliferation compared to single knock-outs and WT control mice, while apoptosis or self-renewal ability were not affected in any of the genotypes. Upon transplantation, p21cip1/waf1-/- bone marrow did not reveal significant alterations in engraftment of lethally irradiated mice, while Caspase-3 deficient HSPC displayed a significant reduction of blood cell production. However, when both p21cip1/waf1 and Caspase-3 were eliminated this differentiation defect caused by Caspase-3 deficiency was abrogated.
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Affiliation(s)
- Carmen Carrillo García
- Department of Internal Medicine III, Division of Hematology/Oncology, University of Bonn, Bonn, Germany
| | - Tamara Riedt
- Department of Internal Medicine III, Division of Hematology/Oncology, University of Bonn, Bonn, Germany
| | - Jin Li
- Department of Internal Medicine III, Division of Hematology/Oncology, University of Bonn, Bonn, Germany
| | - Manuela Dotten
- Department of Internal Medicine III, Division of Hematology/Oncology, University of Bonn, Bonn, Germany
| | - Peter Brossart
- Department of Internal Medicine III, Division of Hematology/Oncology, University of Bonn, Bonn, Germany
| | - Viktor Janzen
- Department of Internal Medicine III, Division of Hematology/Oncology, University of Bonn, Bonn, Germany
- * E-mail:
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18
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Atkins KM, Thomas LL, Barroso-González J, Thomas L, Auclair S, Yin J, Kang H, Chung JH, Dikeakos JD, Thomas G. The multifunctional sorting protein PACS-2 regulates SIRT1-mediated deacetylation of p53 to modulate p21-dependent cell-cycle arrest. Cell Rep 2014; 8:1545-57. [PMID: 25159152 DOI: 10.1016/j.celrep.2014.07.049] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Revised: 07/03/2014] [Accepted: 07/25/2014] [Indexed: 01/12/2023] Open
Abstract
SIRT1 regulates the DNA damage response by deacetylating p53, thereby repressing p53 transcriptional output. Here, we demonstrate that the sorting protein PACS-2 regulates SIRT1-mediated deacetylation of p53 to modulate the DNA damage response. PACS-2 knockdown cells failed to efficiently undergo p53-induced cell-cycle arrest in response to DNA damage. Accordingly, p53 acetylation was reduced both in PACS-2 knockdown cells and thymocytes from Pacs-2(-/-) mice, thereby blunting induction of the cyclin-dependent kinase inhibitor p21 (CDKN1A). The SIRT1 inhibitor EX-527 or SIRT1 knockdown restored p53 acetylation and p21 induction as well as p21-dependent cell-cycle arrest in PACS-2 knockdown cells. Trafficking studies revealed that cytoplasmic PACS-2 shuttled to the nucleus, where it interacted with SIRT1 and repressed SIRT1-mediated p53 deacetylation. Correspondingly, in vitro assays demonstrated that PACS-2 directly inhibited SIRT1-catalyzed p53 deacetylation. Together, these findings identify PACS-2 as an in vivo mediator of the SIRT1-p53-p21 axis that modulates the DNA damage response.
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Affiliation(s)
- Katelyn M Atkins
- Department of Cell and Developmental Biology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Laura L Thomas
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Jonathan Barroso-González
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Laurel Thomas
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Sylvain Auclair
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Jun Yin
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Hyeog Kang
- Laboratory of Obesity and Aging Research, Genetics and Development Biology Center, National Heart Lung and Blood Institute, NIH, Bethesda, MD 20892, USA
| | - Jay H Chung
- Laboratory of Obesity and Aging Research, Genetics and Development Biology Center, National Heart Lung and Blood Institute, NIH, Bethesda, MD 20892, USA
| | - Jimmy D Dikeakos
- Schulich School of Medicine and Dentistry, University of Western Ontario, London ON N6A 5C1, Canada
| | - Gary Thomas
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA.
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Involvement of extrinsic and intrinsic apoptotic pathways together with endoplasmic reticulum stress in cell death induced by naphthylchalcones in a leukemic cell line: advantages of multi-target action. Toxicol In Vitro 2014; 28:769-77. [PMID: 24583196 DOI: 10.1016/j.tiv.2014.02.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 01/25/2014] [Accepted: 02/15/2014] [Indexed: 12/27/2022]
Abstract
Chalcones, naturally occurring open-chain flavonoids abundant in plants, have demonstrated anticancer activity in multiple tumor cells. In a previous work, the potential anticancer activity of three naphthylchalcones named R7, R13 and R15 was shown. In this study, the mechanism of actions of these chalcones was originally shown. The chalcones presented concentration and time-dependent cytotoxicity. To determine the type of cell death induced by chalcones, we assessed a series of assays including measurements of the caspase-8, -9 and -12 activities, expression of important apoptosis-related genes and proteins, changes in the cell calcium concentration and cytochrome c release. The activities of caspase-8, -9 and -12 increased after the treatment of L1210 cells with the three compounds. Chalcones R7 and R13 induced an increase of pro-apoptotic proteins Bax, Bid and Bak (only chalcone R13), as well as a decrease in anti-apoptotic Bcl-2 expression. These chalcones also induced an increase in Fas and a decrease in p21 and p53 expression. Chalcone R15 seems to act by a different mechanism to promote cell death, as it did not change the mitochondrion-related proteins, nor did it induce the cytochrome c release. All compounds induced an increase in cell calcium concentration and an increase in CHOP expression, which together with an increase in caspase-12 activity, suggest that chalcones could induce an endoplasmic reticulum (ER) stress. Taken together, these results suggest that chalcones induce apoptosis by different pathways, being an interesting strategy to suggest for cancer therapy.
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Aqil M, Deliu Z, Elseth KM, Shen G, Xue J, Radosevich JA. Part II-mechanism of adaptation: A549 cells adapt to high concentration of nitric oxide through bypass of cell cycle checkpoints. Tumour Biol 2013; 35:2417-25. [PMID: 24241959 DOI: 10.1007/s13277-013-1319-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/14/2013] [Indexed: 10/26/2022] Open
Abstract
Previous work has shown enhanced survival capacity in high nitric oxide (HNO)-adapted tumor cells. In Part I of this series of manuscripts, we have shown that A549-HNO cells demonstrate an improved growth profile under UV and X-ray radiation treatment. These cells exhibit increased expression of proteins involved in DNA damage recognition and repair pathway, both the non-homologous end joining pathway and homologous recombination. These include Ku80, DNA-PK, XLF ligase and MRN complex proteins. Further, the A549-HNO cells show high levels of ATM, ATR, Chk1 and Chk2, and phospho-p53. Activation of these molecules may lead to cell cycle arrest and apoptosis due to DNA damage. This is observed in parent A549 cells in response to NO donor treatment; however, the A549-HNO cells proliferate and inhibit apoptosis. Cell cycle analysis showed slowed progression through S phase which will allow time for DNA repair. Thus, to better understand the increased growth rate in A549-HNO when compared to the parent cell line A549, we studied molecular mechanisms involved in cell cycle regulation in A549-HNO cells. During the initial time period of NO donor treatment, we observe high levels of cyclin/Cdk complexes involved in regulating various stages of the cell cycle. This would lead to bypass of G1-S and G2-M checkpoints. The HNO cells also show much higher expression of Cdc25A. Cdc25A activates Cdk molecules involved in different phases of the cell cycle. In addition, there is enhanced phosphorylation of the Rb protein in HNO cells. This leads to inactivation of Rb/E2F checkpoint regulating G1-S transition. This may lead to faster progression in S phase. Thus, all of these perturbations in HNO cells lead to accelerated cell cycle progression and a higher growth rate. We also assessed expression of cell cycle inhibitors in HNO cells. Interestingly, the HNO cells show a significant decline in p21CIP1 at initial time points, but with prolonged exposure, the levels were much higher than those of the parent cells. This suggests an initial bypass of cell cycle checkpoints as p21CIP1 can inhibit the activity of all cyclin/Cdk complexes. p21CIP1 is also known to inhibit p53-induced apoptosis. This could be important during later phases of the cell cycle to allow time for repair of damaged DNA and thus better survival of HNO cells.
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Affiliation(s)
- Madeeha Aqil
- Department of Oral Medicine and Diagnostic Sciences, College of Dentistry, University of Illinois at Chicago, 801 S. Paulina St., Chicago, IL, 60612, USA
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21
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Pharmacodynamic study of the 7,8-dihydroxy-4-methylcoumarin-induced selective cytotoxicity toward U-937 leukemic cells versus mature monocytes: cytoplasmic p21(Cip1/WAF1) as resistance factor. Biochem Pharmacol 2013; 86:210-21. [PMID: 23665351 DOI: 10.1016/j.bcp.2013.04.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 04/20/2013] [Accepted: 04/23/2013] [Indexed: 01/04/2023]
Abstract
The development of tumor-selective drugs with low systemic toxicity has always been a major challenge in cancer treatment. Our group previously identified the 7,8-dihydroxy-4-methylcoumarin (DHMC) as a potential chemotherapeutic agent due to its potent, selective anti-proliferative and apoptosis-inducing effects on several cancer cell lines over peripheral blood mononuclear cells. However, there are still no published reports that can explain such selectivity of action. Herein, we addressed this question by using the U-937 promonocytic leukemia cell line, which can be forced to differentiate into a monocyte-like phenotype in vitro. U-937 cells differentiation is dependent on the nuclear expression of p21(Cip1/WAF1), a protein that is absent in immature U-937 cells but present in both the nucleus and the cytoplasm of normal DHMC-resistant monocytes. Considering that induction of differentiation rendered U-937 cells resistant to DHMC, we evaluated the possible causal role of cytoplasmic p21(Cip1/WAF1) in the onset of such resistance by employing U-937 cells stably transfected with a ZnCl2-inducible p21(Cip1/WAF1) variant lacking the nuclear localization signal (U-937/CB6-ΔNLS-p21 cells). Expression of cytoplasmic p21(Cip1/WAF1) did not induce differentiation of the cells but turned them resistant to DHMC through inhibition of JNK, a crucial mediator of DHMC-induced apoptosis in U-937 cells. Sub-acute toxicity evaluation of DHMC in Balb/c mice indicated that DHMC administered intraperitoneally at doses up to 100mg/kg induced no systemic damage. Collectively, our results explain for the first time the selective cytotoxicity of DHMC for tumor cells over normal monocytes, and encourage further in vivo studies on this compound as potential anti-leukemic agent.
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Lehmann TP, Wrzesiński T, Jagodziński PP. The effect of mitotane on viability, steroidogenesis and gene expression in NCI‑H295R adrenocortical cells. Mol Med Rep 2012; 7:893-900. [PMID: 23254310 DOI: 10.3892/mmr.2012.1244] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Accepted: 11/26/2012] [Indexed: 11/06/2022] Open
Abstract
Mitotane, also known as o,p'‑DDD or (RS)‑1‑chl-oro‑2‑[2,2‑dichloro‑1‑(4‑chlorophenyl)‑ethyl]‑benzene, is an adrenal cortex-specific cytotoxic drug used in the therapy of adrenocortical carcinoma (ACC). The drug also inhibits steroidogenesis, however, the mechanisms of its anticancer and antisteroidogenic effects remain unknown. At present, data on the impact of mitotane on cell viability and the regulation of genes encoding proteins associated with steroids synthesis in the adrenal cortex, including cortisol and dehydroepiandrosterone sulfate (DHEAS), are limited and contradictory. In the present study, the effect of 24‑h mitotane treatment on viability of the ACC cell line, NCI‑H295R, was analyzed, identifying a decrease in cell viability and an increase in caspase‑3 and ‑7 activities. Mitotane treatment also led to decreased cortisol and DHEAS concentration in the culture media. Concomitantly, mitotane resulted in decreased mRNA levels of two cytochromes P450 (CYP11A1 and CYP17A1), mRNAs encoding proteins involved in the synthesis of cortisol and DHEAS. Mitotane did not affect mRNA levels of cyclin dependent kinase inhibitor 1A (encoding p21) and MYC (encoding cMyc). cMyc and p21 are key transcription factors associated with cell cycle regulation. However, mitotane inhibited expression of transforming growth factor β1 gene, encoding a potent inhibitor of cell proliferation and steroidogenesis. PRKAR1A, a protein kinase A regulatory subunit, is involved in the activation of steroidogenesis. PRKAR1A mRNA levels were reduced following 24‑h treatment with mitotane. Results indicate that mitotane markedly inhibited expression of genes involved in steroidogenesis, secretion of cortisol and DHEAS. Reduced expression of TGFB1 cannot account fully for the effect of mitotane on CYP11A1 and CYP17A1. We hypothesized that reduced viability of NCI‑H295R cells in the presence of mitotane may be a result of apoptosis triggered by increased caspase‑3 and ‑7 activities. Since p21 and cMyc mRNA levels were stable in the presence of mitotane, the mechanism by which caspase‑3 and ‑7 are induced remains unknown.
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Affiliation(s)
- Tomasz P Lehmann
- Department of Biochemistry and Molecular Biology, Poznan University of Medical Sciences, Poznan 60‑781, Poland
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Romanov VS, Pospelov VA, Pospelova TV. Cyclin-dependent kinase inhibitor p21(Waf1): contemporary view on its role in senescence and oncogenesis. BIOCHEMISTRY (MOSCOW) 2012; 77:575-84. [PMID: 22817456 DOI: 10.1134/s000629791206003x] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
p21(Waf1) was identified as a protein suppressing cyclin E/A-CDK2 activity and was originally considered as a negative regulator of the cell cycle and a tumor suppressor. It is now considered that p21(Waf1) has alternative functions, and the view of its role in cellular processes has begun to change. At present, p21(Waf1) is known to be involved in regulation of fundamental cellular programs: cell proliferation, differentiation, migration, senescence, and apoptosis. In fact, it not only exhibits antioncogenic, but also oncogenic properties. This review provides a contemporary understanding of the functions of p21(Waf1) depending on its intracellular localization. On one hand, when in the nucleus, it serves as a negative cell cycle regulator and tumor suppressor, in particular by participating in the launch of a senescence program. On the other hand, when p21(Waf1) is localized in the cytoplasm, it acts as an oncogene by regulating migration, apoptosis, and proliferation.
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Affiliation(s)
- V S Romanov
- Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, 194064 St. Petersburg, Russia.
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24
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Chen X, Zhang J, Zhang M, Liu S, Yan W, Jung J, Chen X. Serine 123 phosphorylation modulates p21 protein stability and activity by suppressing ubiquitin-independent proteasomal degradation. J Biol Chem 2012; 287:34410-8. [PMID: 22908227 DOI: 10.1074/jbc.m112.384990] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The cyclin-dependent kinase inhibitor p21(Waf1/Cip1) is a major regulator of the cell cycle and plays an important role in many cellular processes, including differentiation, stress response, apoptosis, and tumorigenesis. We previously cloned the gene encoding dog p21 and found that unlike its human ortholog, dog p21 is expressed as two isoforms, one high molecular mass band of 23 kDa and one low molecular mass band of 19 kDa. In the current study, we found that the high molecular mass band is phosphorylated, whereas the low molecular mass band is hypophosphorylated. Moreover, by generating multiple mutants of dog p21, we found that serine 123 and proline 124, which form a consensus site for proline-directed phosphorylation, are required for expression of the high molecular mass p21 isoform through phosphorylation at serine 123. Most importantly, we showed that serine 123 phosphorylation inhibits ubiquitin-independent proteasomal degradation of p21 protein and subsequently, prolongs p21 protein half-life and enhances the ability of p21 to suppress cell proliferation. Taken together, these data reveal that serine 123 phosphorylation modulates p21 protein stability and activity by suppressing ubiquitin-independent proteasomal degradation.
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Affiliation(s)
- Xiangling Chen
- Comparative Oncology Laboratory, University of California, Davis, California 95616, USA
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25
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Wiese C, Rudolph JH, Jakob B, Fink D, Tobias F, Blattner C, Taucher-Scholz G. PCNA-dependent accumulation of CDKN1A into nuclear foci after ionizing irradiation. DNA Repair (Amst) 2012; 11:511-21. [DOI: 10.1016/j.dnarep.2012.02.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Revised: 02/04/2012] [Accepted: 02/28/2012] [Indexed: 12/30/2022]
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26
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Hwang JW, Baek YM, Yang KE, Yoo HS, Cho CK, Lee YW, Park J, Eom CY, Lee ZW, Choi JS, Jang IS. Lactobacillus casei extract induces apoptosis in gastric cancer by inhibiting NF-κB and mTOR-mediated signaling. Integr Cancer Ther 2012; 12:165-73. [PMID: 22505595 DOI: 10.1177/1534735412442380] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Lactobacillus casei extract (LBX) has been reported to prevent gastric cancer, but the underlying mechanism remains unclear. The proliferation and cell death of gastric cancer KATO3 cells were examined after treatment with LBX for various times and at various doses. LBX inhibited the growth of gastric cancer cells and induced apoptosis by inactivating NF-κB promoter activity. Apoptosis induced by LBX, however, is not directly associated with the intrinsic mitochondrial pathway. Immunoblot analysis revealed that LBX decreased the expressions of NF-κB and IκB. The reduced NF-κB levels led to the decreased phosphorylation of mTOR signaling components, such as PI3K, Akt, and (p70)S6 kinase. These results showed for the first time that LBX induced apoptosis in gastric cancer cells by inhibiting NF-κB and mTOR-mediated signaling.
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Zhou Y, Li G, Ji Y, Liu C, Zhu J, Lu Y. Cytoplasmic p21 induced by p65 prevents doxorubicin-induced cell death in pancreatic carcinoma cell line. J Biomed Sci 2012; 19:15. [PMID: 22305266 PMCID: PMC3298465 DOI: 10.1186/1423-0127-19-15] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Accepted: 02/04/2012] [Indexed: 12/29/2022] Open
Abstract
Background Studies have shown the existence of p21 induction in a p53-dependent and -independent pathway. Our previous study indicates that DOX-induced p65 is able to bind the p21 promoter to activate its transactivation in the cells. Methods Over-expression and knock-down experiments were performed in Human Pancreatic Carcinoma (PANC1) cells. Cell cycle and cell death related proteins were assessed by Western Blotting. Cytotoxicity assay was checked by CCK-8 kit. Cell growth was analyzed by flow cytometers. Results Here we showed that over-expression of p65 decreased the cytotoxic effect of DOX on PANC1 cells, correlating with increased induction of cytoplasmic p21. We observed that pro-caspase-3 physically associated with cytoplasmic p21, which may be contribution to prevent p21 translocation into the nucleus. Our data also suggested that no clear elevation of nuclear p21 by p65 provides a survival advantage by progression cell cycle after treatment of DOX. Likewise, down-regulation of p65 expression enhanced the cytotoxic effect of DOX, due to a significant decrease of mRNA levels of anti-apoptotic genes, such as the cellular inhibitor of apoptosis-1 (c-IAP1), and the long isoform of B cell leukemia/lymphoma-2 (Bcl-2), leading to efficient induction of caspase-3 cleavage in the cells. More, we present evidence that over-expression of p53 or p53/p65 in the PANC1 cells were more sensitive to DOX treatment, correlated with activation of caspase-3 and clear elevation of nuclear p21 level. Our previous data suggested that expression of p21 increases Gefitinib-induced cell death by blocking the cell cycle at the G1 and G2 phases. The present findings here reinforced this idea by showing p21's ability of potentiality of DOX-induced cell death correlated with its inhibition of cell cycle progression after over-expression of p53 or p53/p65. Conclusion Our data suggested p65 could increase p53-mediated cell death in response to DOX in PANC1 cells. Thus, it is worth noting that in p53 null or defective tumors, targeting in down-regulation of p65 may well be useful, leading to the potentiality of chemotherapeutic drugs.
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Affiliation(s)
- YingQi Zhou
- Tongji University School of Medicine, Shanghai, China
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Sterlacci W, Fiegl M, Tzankov A. Prognostic and Predictive Value of Cell Cycle Deregulation in Non-Small-Cell Lung Cancer. Pathobiology 2012; 79:175-94. [DOI: 10.1159/000336462] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Accepted: 01/12/2012] [Indexed: 12/29/2022] Open
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Multiple degradation pathways regulate versatile CIP/KIP CDK inhibitors. Trends Cell Biol 2011; 22:33-41. [PMID: 22154077 DOI: 10.1016/j.tcb.2011.10.004] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2011] [Revised: 10/18/2011] [Accepted: 10/24/2011] [Indexed: 01/06/2023]
Abstract
The mammalian CIP/KIP family of cyclin-dependent kinase (CDK) inhibitors (CKIs) comprises three proteins--p21(Cip1/WAF1), p27(Kip1), and p57(Kip2)--that bind and inhibit cyclin-CDK complexes, which are key regulators of the cell cycle. CIP/KIP CKIs have additional independent functions in regulating transcription, apoptosis and actin cytoskeletal dynamics. These divergent functions are performed in distinct cellular compartments and contribute to the seemingly contradictory observation that the CKIs can both suppress and promote cancer. Multiple ubiquitin ligases (E3s) direct the proteasome-mediated degradation of p21, p27 and p57. This review analyzes recent data highlighting our current understanding of how distinct E3 pathways regulate subpopulations of the CKIs to control their diverse functions.
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p21(WAF1/CIP1) upregulation through the stress granule-associated protein CUGBP1 confers resistance to bortezomib-mediated apoptosis. PLoS One 2011; 6:e20254. [PMID: 21637851 PMCID: PMC3102688 DOI: 10.1371/journal.pone.0020254] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Accepted: 04/28/2011] [Indexed: 12/24/2022] Open
Abstract
Background p21WAF1/CIP1 is a well known cyclin-dependent kinase inhibitor induced by various stress stimuli. Depending on the stress applied, p21 upregulation can either promote apoptosis or prevent against apoptotic injury. The stress-mediated induction of p21 involves not only its transcriptional activation but also its posttranscriptional regulation, mainly through stabilization of p21 mRNA levels. We have previously reported that the proteasome inhibitor MG132 induces the stabilization of p21 mRNA, which correlates with the formation of cytoplasmic RNA stress granules. The mechanism underlying p21 mRNA stabilization, however, remains unknown. Methodology/Principal Findings We identified the stress granules component CUGBP1 as a factor required for p21 mRNA stabilization following treatment with bortezomib ( = PS-341/Velcade). This peptide boronate inhibitor of the 26S proteasome is very efficient for the treatment of myelomas and other hematological tumors. However, solid tumors are sometimes refractory to bortezomib treatment. We found that depleting CUGBP1 in cancer cells prevents bortezomib-mediated p21 upregulation. FISH experiments combined to mRNA stability assays show that this effect is largely due to a mistargeting of p21 mRNA in stress granules leading to its degradation. Altering the expression of p21 itself, either by depleting CUGBP1 or p21, promotes bortezomib-mediated apoptosis. Conclusions/Significance We propose that one key mechanism by which apoptosis is inhibited upon treatment with chemotherapeutic drugs might involve upregulation of the p21 protein through CUGBP1.
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Bouchet BP, Fauvet F, Grelier G, Galmarini CM, Puisieux A. p21(Cip1) regulates cell-substrate adhesion and interphase microtubule dynamics in untransformed human mammary epithelial cells. Eur J Cell Biol 2011; 90:631-41. [PMID: 21561680 DOI: 10.1016/j.ejcb.2011.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Revised: 03/01/2011] [Accepted: 03/07/2011] [Indexed: 12/19/2022] Open
Abstract
Despite its frequent inactivation in human breast cancers, the role of p21(Cip1) (p21) in morphological plasticity of normal mammary epithelial cells is still poorly understood. To address this question, we have investigated the consequences of p21 silencing in two-dimensional (2D) morphogenesis of untransformed human mammary epithelial cells. Here we show that p21 inactivation causes a reduction of 2D cell spreading and suppresses focal adhesion. In order to investigate the cytoskeletal modifications associated with this altered morphology, we have analyzed the microtubule dynamics in interphase p21-depleted cells. Our results demonstrate that interphase microtubule dynamic instability is strongly increased by p21 silencing. This alteration correlates with severe microtubule hypoacetylation. Next, we show that these microtubule defects in p21-depleted cells can be reversed by the use of the small molecule tubacin, a specific inhibitor of the α-tubulin deacetylase HDAC6. Tubacin-induced microtubule dynamics decrease also correlates with a partial recovery of cell spreading and focal adhesion in those cells. Collectively, these data indicate that p21 regulates the morphological plasticity of normal mammary epithelial cells by modulating dynamics of key cytoskeletal components.
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32
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Cheng X, Xia W, Yang JY, Hsu JL, Chou CK, Sun HL, Wyszomierski SL, Mills GB, Muller WJ, Yu D, Hung MC. Activation of p21(CIP1/WAF1) in mammary epithelium accelerates mammary tumorigenesis and promotes lung metastasis. Biochem Biophys Res Commun 2010; 403:103-7. [PMID: 21040707 DOI: 10.1016/j.bbrc.2010.10.126] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Accepted: 10/26/2010] [Indexed: 12/12/2022]
Abstract
While p21 is well known to inhibit cyclin-CDK activity in the nucleus and it has also been demonstrated to have oncogenic properties in different types of human cancers. In vitro studies showed that the oncogenic function of p21is closely related to its cytoplasmic localization. However, it is unclear whether cytoplasmic p21 contributes to tumorigenesis in vivo. To address this question, we generated transgenic mice expressing the Akt-phosphorylated form of p21 (p21T145D) in the mammary epithelium. The results showed that Akt-activated p21 was expressed in the cytoplasm of mammary epithelium. Overexpression of Akt-activated p21 accelerated tumor onset and promoted lung metastasis in MMTV/neu mice, providing evidence that p21, especially cytoplasmic phosphorylated p21, has an oncogenic role in promoting mammary tumorigenesis and metastasis.
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Affiliation(s)
- Xiaoyun Cheng
- Department of Molecular and Cellular Oncology, The University of Texas, M D Anderson Cancer Center, Houston, TX 77030, USA
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Jung YS, Qian Y, Chen X. Examination of the expanding pathways for the regulation of p21 expression and activity. Cell Signal 2010; 22:1003-12. [PMID: 20100570 PMCID: PMC2860671 DOI: 10.1016/j.cellsig.2010.01.013] [Citation(s) in RCA: 315] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2010] [Accepted: 01/16/2010] [Indexed: 02/06/2023]
Abstract
p21(Waf1/Cip1/Sdi1) was originally identified as an inhibitor of cyclin-dependent kinases, a mediator of p53 in growth suppression and a marker of cellular senescence. p21 is required for proper cell cycle progression and plays a role in cell death, DNA repair, senescence and aging, and induced pluripotent stem cell reprogramming. Although transcriptional regulation is considered to be the initial control point for p21 expression, there is growing evidence that post-transcriptional and post-translational regulations play a critical role in p21 expression and activity. This review will briefly discuss the activity of p21 and focus on current knowledge of the determinants that control p21 transcription, mRNA stability and translation, and protein stability and activity.
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Affiliation(s)
- Yong-Sam Jung
- Center for Comparative Oncology, University of California, Davis, California 95616, USA
| | - Yingjuan Qian
- Center for Comparative Oncology, University of California, Davis, California 95616, USA
| | - Xinbin Chen
- Center for Comparative Oncology, University of California, Davis, California 95616, USA
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Höti N, Chowdhury WH, Mustafa S, Ribas J, Castanares M, Johnson T, Liu M, Lupold SE, Rodriguez R. Armoring CRAds with p21/Waf-1 shRNAs: the next generation of oncolytic adenoviruses. Cancer Gene Ther 2010; 17:585-97. [PMID: 20448671 DOI: 10.1038/cgt.2010.15] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Conditionally replicating adenoviruses (CRAds) represent a promising modality for the treatment of neoplastic diseases, including Prostate Cancer. Selectively replicating viruses can be generated by placing a tissue or cancer-specific promoter upstream of one or more of the viral genes required for replication (for example, E1A, E1B). We have previously reported multiple cellular processes that can attenuate viral replication, which in turn compromises viral oncolysis and tumor kill. In this study, we investigated the importance of the cyclin-dependent kinase inhibitor p21/Waf-1, on viral replication and tumor growth. To our knowledge, this is the first report describing the importance of p21/Waf-1shRNA on the induction of an androgen responsive element (ARE) based promoter driving the E1A gene. As a proof of concept, the study emphasizes the use of RNA interference technology to overcome promoter weaknesses for tissue-specific oncolytic viruses, as well as the cellular inhibitor pathways on viral life cycle. Using RNA interference against p21/Waf-1, we were able to show an increase in viral replication and viral oncolysis of prostate cancer cells. Similarly, CRAd viruses that carry p21/Waf-1 shRNA (Ad5-RV004.21) were able to prevent tumor outgrowth that resulted in a marked increase in the mean survival time of tumor-bearing mice compared with CRAd without p21/Waf-1 shRNA (Ad5-RV004). In studies combining Ad5-RV004.21 with Adriamycin, a suprar-additive effect was observed only in CRAds that harbor shRNA against p21/Waf-1. Taken together, these findings of enhanced viral replication in prostate cancer cells by using RNA interference against the cdk inhibitor p21/Waf-1 have significant implications in the development of prostate-specific CRAd therapies.
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Affiliation(s)
- N Höti
- Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287-2101, USA
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35
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The ATDC (TRIM29) protein binds p53 and antagonizes p53-mediated functions. Mol Cell Biol 2010; 30:3004-15. [PMID: 20368352 DOI: 10.1128/mcb.01023-09] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The ataxia telangiectasia group D-complementing (ATDC) gene product, also known as TRIM29, is a member of the tripartite motif (TRIM) protein family. ATDC has been proposed to form homo- or heterodimers and to bind nucleic acids. In cell cultures, ATDC expression leads to rapid growth and resistance to ionizing radiation (IR), whereas silencing of ATDC expression decreases growth rates and increases sensitivity to IR. Although ATDC is overexpressed in many human cancers, the biological significance of ATDC overexpression remains obscure. We report here that ATDC increases cell proliferation via inhibition of p53 nuclear activities. ATDC represses the expression of p53-regulated genes, including p21 and NOXA. Mechanistically, ATDC binds p53, and this interaction is potentially fine-tuned by posttranslational acetylation of lysine 116 on ATDC. The association of p53 and ATDC results in p53 sequestration outside of the nucleus. Together, these results provide novel mechanistic insights into the function of ATDC and offer an explanation for how ATDC promotes cancer cell proliferation.
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Wang Z, Zhang Y, Gu JJ, Davitt C, Reeves R, Magnuson NS. Pim-2 phosphorylation of p21(Cip1/WAF1) enhances its stability and inhibits cell proliferation in HCT116 cells. Int J Biochem Cell Biol 2010; 42:1030-8. [PMID: 20307683 DOI: 10.1016/j.biocel.2010.03.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Revised: 02/18/2010] [Accepted: 03/12/2010] [Indexed: 12/19/2022]
Abstract
Pim-2 kinase is one of the three highly conserved Pim family members which are known to be involved in cell survival and cell proliferation. Here we demonstrate that like Pim-1, Pim-2 also phosphorylates the cell cycle inhibitor p21(Cip1/WAF1) (p21) on Thr145 in vitro and in vivo. Overexpression of Pim-2 in HCT116 cells leads to the increased stability of p21 and results in enhanced levels of both exogenous and endogenous p21 proteins. Knockdown of Pim-2 expression via siRNA results in reduced level of endogenous p21, indicating that like Pim-1, Pim-2 is another legitimate p21 kinase. However, Pim-2 has no influence on the nuclear localization of p21 in HCT116 cells. In addition, Pim-2 is able to arrest the cell cycle at G1/S phase and inhibit cell proliferation through phosphorylation of p21 in HCT116 cells. These data suggest that Pim-2 phosphorylation of p21 enhances p21's stability and inhibits cell proliferation in HCT116 cells.
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Affiliation(s)
- Zeping Wang
- School of Molecular Biosciences, Washington State University, Pullman, WA 99164-7520, USA
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Extracellular adenosine induces apoptosis in Caco-2 human colonic cancer cells by activating caspase-9/-3 via A(2a) adenosine receptors. J Gastroenterol 2009; 44:56-65. [PMID: 19159073 DOI: 10.1007/s00535-008-2273-7] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Accepted: 08/04/2008] [Indexed: 02/06/2023]
Abstract
BACKGROUND Extracellular adenosine has been shown to induce apoptosis in a variety of cells via an intrinsic pathway linked to adenosine uptake into cells and the ensuing signaling cascades and an extrinsic pathway linked to adenosine receptors. The present study was designed to understand the mechanism underlying adenosine-induced apoptosis of Caco-2 human colonic cancer cells. METHODS To observe cell viability, an MTT assay was carried out in Caco-2 cells untransfected or transfected with the A(2a) adenosine receptor pcDNA3.1. Apoptotic cell death was assessed with flow cytometry using propidium iodide and annexin V and internucleosomal DNA fragmentation analysis. Activities of caspase-3, -8, and -9 were measured using a caspase fluorometric assay kit. Mitochondrial membrane potentials were monitored using a DePsipher kit. Expression of adenosine receptors was examined with the reverse transcription-polymerase chain reaction (RT-PCR) method. RESULTS Extracellular adenosine induced Caco-2 cell apoptosis in a concentration-dependent (1-20 mM) and treatment time-dependent (24-72 h) manner. The adenosine effect was inhibited by DMPX, an inhibitor of A(2a) adenosine receptors and SQ22536, an inhibitor of adenylate cyclase. CGS21680, an agonist of A(2a) adenosine receptors, and forskolin, an adenylate cyclase activator, mimicked the adenosine action. Caco-2 cell death was still induced by overexpressing A(2a) adenosine receptors, and adenosine further promoted the cell death. Adenosine disrupted mitochondrial membrane potentials and activated caspase-9 and -3, but not caspase-8. CONCLUSIONS Extracellular adenosine induces apoptosis in Caco-2 cells by activating caspase-9 and the downstream effector caspase caspase-3 in association with mitochondrial damage via A(2a) adenosine receptors.
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Vitiello PF, Wu YCM, Staversky RJ, O’Reilly MA. p21(Cip1) protects against oxidative stress by suppressing ER-dependent activation of mitochondrial death pathways. Free Radic Biol Med 2009; 46:33-41. [PMID: 18948188 PMCID: PMC2631574 DOI: 10.1016/j.freeradbiomed.2008.09.022] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Revised: 08/04/2008] [Accepted: 09/11/2008] [Indexed: 01/23/2023]
Abstract
Although it is well established that the cell cycle inhibitor p21 protects against genotoxic stress by preventing the replication of damaged DNA, recent studies have shown that the cytoplasmic form can also protect. It protects by delaying the loss of the antiapoptotic proteins Mcl-1 and Bcl-X(L); however, the mechanism of regulation is unknown. Utilizing hyperoxia as a model of chronic oxidative stress and DNA damage, p21 was detected in the nucleus and cytoplasm and cytoplasmic expression of p21 was sufficient for cytoprotection. p21 was enriched in a subcellular fraction containing mitochondria and endoplasmic reticulum (ER), suggesting that it may be coordinating ER and mitochondrial stress pathways. Consistent with this, p21 suppressed hyperoxic downregulation of BiP and subsequent activation of ER stress signaling, which affected Mcl-1, but not Bcl-X(L); though both inhibited hyperoxic cell death. Taken together, these data show that p21 integrates the DNA damage response with ER stress signaling, which then regulates mitochondrial death pathways during chronic genotoxic stress.
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Affiliation(s)
- Peter F. Vitiello
- Department of Environmental Medicine, The University of Rochester, Rochester, NY 14642
- Department of Pediatrics, The University of Rochester, Rochester, NY 14642
| | - Yu-Chieh M. Wu
- Department of Biomedical Genetics, The University of Rochester, Rochester, NY 14642
| | | | - Michael A. O’Reilly
- Department of Environmental Medicine, The University of Rochester, Rochester, NY 14642
- Department of Pediatrics, The University of Rochester, Rochester, NY 14642
- Address Correspondence to: Michael A. O’Reilly, Ph.D., Department of Pediatrics, Box 850, The University of Rochester, 601 Elmwood Avenue, Rochester, NY 14642, Tel: (585) 275-5948, Fax: (585) 756-7780,
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Galanin decreases proliferation of PC12 cells and induces apoptosis via its subtype 2 receptor (GalR2). Proc Natl Acad Sci U S A 2008; 105:2717-22. [PMID: 18272487 DOI: 10.1073/pnas.0712300105] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Galanin is a neuropeptide with a wide range of effects in the nervous and endocrine systems, mediated through three G protein-coupled receptor subtypes (GalR1-3). Interestingly, galanin and its receptors are also expressed in certain tumors. Here we studied the effects of galanin in rat pheochromocytoma (PC12) cells stably transfected with GFP-tagged GalR2. Galanin at 100 nM inhibited cell proliferation in both nontransfected and transfected cells. Conversly, both galanin and the GalR2(R3)-agonist AR-M1896 induced caspase-dependent apoptotic cell death only in GalR2-transfected cells. Western-blot analyses of downstream mediators of the G(q/11)-type G protein showed down-regulation of pAkt and pBad in galanin-exposed transfected cells. Also, the specific PI3 kinase inhibitor LY-294002 increased the level of pBad and decreased activation of caspases. In addition, p21(cip1) levels were up-regulated in galanin-exposed PC12 cells and down-regulated in galanin-exposed GalR2-transfected cells. In agreement, FACS analyses of galanin exposed cells showed occurrence of cell cycle arrest in PC12 cells and cell death in transfected cells. Finally, as shown with real-time PCR, galanin and its receptors were expressed at very high levels in human pheochromocytoma tissues as compared with normal adrenal medulla. These findings point to GalR2 as a possible target for therapeuthic interventions in pheochromocytoma.
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Vitiello PF, Staversky RJ, Keng PC, O’Reilly MA. PUMA inactivation protects against oxidative stress through p21/Bcl-XL inhibition of bax death. Free Radic Biol Med 2008; 44:367-74. [PMID: 18215742 PMCID: PMC2276618 DOI: 10.1016/j.freeradbiomed.2007.09.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2007] [Revised: 09/05/2007] [Accepted: 09/21/2007] [Indexed: 01/10/2023]
Abstract
The tumor suppressor protein p53 activates growth arrest and proapoptotic genes in response to DNA damage. It is known that negative feedback by p21(Cip1/Waf1/Sdi1) represses p53-dependent transactivation of PUMA. The current study investigates PUMA feedback on p53 during oxidative stress from hyperoxia and the subsequent effects on cell survival mediated through p21 and Bcl-X(L). Deletion of PUMA in HCT116 colon carcinoma cells increased levels of p53 and p21, resulting in a larger G(1) population during hyperoxia. P21-dependent increase in Bcl-X(L) levels protected PUMA-deficient cells against hyperoxic cell death. Bax and Bak were both able to promote hyperoxic cell death. Bcl-X(L) protection against hyperoxic death was lost in cells lacking Bax, not PUMA, suggesting that Bcl-X(L) acts to inhibit Bax-dependent death. These results indicate that PUMA exerts a negative feedback on p53 and p21, leading to p21-dependent growth suppressive and survival changes. Enhanced survival was associated with increased Bcl-X(L) to block Bax activated cell death during oxidative stress.
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Affiliation(s)
- Peter F. Vitiello
- Department of Environmental Medicine, School of Medicine and Dentistry, The University of Rochester, Rochester NY 14642
| | - Rhonda J. Staversky
- Department of Pediatrics, School of Medicine and Dentistry, The University of Rochester, Rochester NY 14642
| | - Peter C. Keng
- Department of Radiation Oncology, School of Medicine and Dentistry, The University of Rochester, Rochester NY 14642
| | - Michael A. O’Reilly
- Department of Pediatrics, School of Medicine and Dentistry, The University of Rochester, Rochester NY 14642
- Address Correspondence to: Michael A. O’Reilly, Ph.D., Department of Pediatrics, Box 850, The University of Rochester, School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester NY 14642, Tel: (585) 275-5948, Fax: (585) 756-7780,
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41
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Liu Y, Yeh N, Zhu XH, Leversha M, Cordon-Cardo C, Ghossein R, Singh B, Holland E, Koff A. Somatic cell type specific gene transfer reveals a tumor-promoting function for p21(Waf1/Cip1). EMBO J 2007; 26:4683-93. [PMID: 17948060 PMCID: PMC2048756 DOI: 10.1038/sj.emboj.7601886] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2007] [Accepted: 09/19/2007] [Indexed: 02/08/2023] Open
Abstract
How proteins participate in tumorigenesis can be obscured by their multifunctional nature. For example, depending on the cellular context, the cdk inhibitors can affect cell proliferation, cell motility, apoptosis, receptor tyrosine kinase signaling, and transcription. Thus, to determine how a protein contributes to tumorigenesis, we need to evaluate which functions are required in the developing tumor. Here we demonstrate that the RCAS/TvA system, originally developed to introduce oncogenes into somatic cells of mice, can be adapted to allow us to define the contribution that different functional domains make to tumor development. Studying the development of growth-factor-induced oligodendroglioma, we identified a critical role for the Cy elements in p21, and we showed that cyclin D1T286A, which accumulates in the nucleus of p21-deficient cells and binds to cdk4, could bypass the requirement for p21 during tumor development. These genetic results suggest that p21 acts through the cyclin D1–cdk4 complex to support tumor growth, and establish the utility of using a somatic cell modeling system for defining the contribution proteins make to tumor development.
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Affiliation(s)
- Yuhui Liu
- Department of Molecular Biology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA
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42
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Krämer OH, Knauer SK, Zimmermann D, Stauber RH, Heinzel T. Histone deacetylase inhibitors and hydroxyurea modulate the cell cycle and cooperatively induce apoptosis. Oncogene 2007; 27:732-40. [PMID: 17653085 DOI: 10.1038/sj.onc.1210677] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Therapy resistance represents a major problem for disease management in oncology. Histone deacetylase inhibitors (HDACi) have been shown to modulate the cell cycle, to induce apoptosis and to sensitize cancer cells for other chemotherapeutics. Our study shows that the HDACi valproic acid (VPA) and the ribonucleotide reductase inhibitor hydroxyurea (HU) potentiate the pro-apoptotic effects of each other towards several cancer cell lines. This correlates with the HU-induced degradation of the cyclin-dependent kinase inhibitors (CDKI) p21 and p27, mediated by the proteasome or caspase-3. Moreover, we found that caspase-3 activation is required for VPA-induced apoptosis. Remarkably, p21 and p27 can confer resistance against VPA and HU. Both CDKI interact with caspase-3 and compete with other caspase-3 substrates. Hence, p21 and p27 may contribute to chemotherapy resistance as apoptosis inhibitors. Since the biological effects of VPA and HU could be achieved at concentrations used in current treatment protocols, the combined application of these compounds might be considered as a potential strategy for cancer treatment.
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Affiliation(s)
- O H Krämer
- Institute of Biochemistry and Biophysics, Friedrich-Schiller-University Jena, Jena, Germany
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Maier JKX, Balabanian S, Coffill CR, Stewart A, Pelletier L, Franks DJ, Gendron NH, MacKenzie AE. Distribution of neuronal apoptosis inhibitory protein in human tissues. J Histochem Cytochem 2007; 55:911-23. [PMID: 17510375 DOI: 10.1369/jhc.6a7144.2007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The neuronal apoptosis inhibitory protein (NAIP) gene, also known as the baculovirus inhibitor of apoptosis repeat-containing protein 1 (BIRC1) gene, is a member of the inhibitors of apoptosis (IAP) family and was first characterized as a candidate gene for spinal muscular atrophy (SMA). The expression of NAIP has been thoroughly studied in the central nervous system and overlaps the pattern of neurodegeneration in SMA. Recent studies have pointed to a role for NAIP in non-neuronal cells. We report here the production of a specific anti-NAIP antibody and the profile of NAIP expression in human adult tissues by Western blot and immunohistochemical detection methods. NAIP was detected in a number of tissues by Western blot analysis, but immunohistochemistry revealed that NAIP's presence in certain tissues, such as liver, lung, and spleen, is most likely due to macrophage infiltration. In the small intestine, the expression of NAIP coincides with the expression of p21(WAF1). This observation, coupled with findings from other groups, suggests a role for NAIP in increasing the survival of cells undergoing terminal differentiation as well as the possibility that the protein serves as an intestinal pathogen recognition protein. This manuscript contains online supplemental material at http://www.jhc.org. Please visit this article online to view these materials.
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Affiliation(s)
- Johannes K X Maier
- Department of Biochemistry, Microbiology, and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
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Harms C, Albrecht K, Harms U, Seidel K, Hauck L, Baldinger T, Hübner D, Kronenberg G, An J, Ruscher K, Meisel A, Dirnagl U, von Harsdorf R, Endres M, Hörtnagl H. Phosphatidylinositol 3-Akt-kinase-dependent phosphorylation of p21(Waf1/Cip1) as a novel mechanism of neuroprotection by glucocorticoids. J Neurosci 2007; 27:4562-71. [PMID: 17460069 PMCID: PMC6672985 DOI: 10.1523/jneurosci.5110-06.2007] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The role of glucocorticoids in the regulation of apoptosis remains incongruous. Here, we demonstrate that corticosterone protects neurons from apoptosis by a mechanism involving the cyclin-dependent kinase inhibitor p21(Waf1/Cip1). In primary cortical neurons, corticosterone leads to a dose- and Akt-kinase-dependent upregulation with enhanced phosphorylation and cytoplasmic appearance of p21(Waf1/Cip1) at Thr 145. Exposure of neurons to the neurotoxin ethylcholine aziridinium (AF64A) results in activation of caspase-3 and a dramatic loss of p21(Waf1/Cip1) preceding apoptosis in neurons. These effects of AF64A are reversed by pretreatment with corticosterone. Corticosterone-mediated upregulation of p21(Waf1/Cip1) and neuroprotection are completely abolished by glucocorticoid and mineralocorticoid receptor antagonists as well as inhibitors of PI3- and Akt-kinase. Both germline and somatically induced p21(Waf1/Cip1) deficiency abrogate the neuroprotection by corticosterone, whereas overexpression of p21(Waf1/Cip1) suffices to protect neurons from apoptosis. We identify p21(Waf1/Cip1) as a novel antiapoptotic factor for postmitotic neurons and implicate p21(Waf1/Cip1) as the molecular target of neuroprotection by high-dose glucocorticoids.
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Affiliation(s)
- Christoph Harms
- Klinik und Poliklinik für Neurologie
- Neurowissenschaftliches Forschungszentrum, and
| | - Katharina Albrecht
- Institut für Pharmakologie und Toxikologie, Charité Campus Mitte, Charité–Universitätsmedizin Berlin, D-10117 Berlin, Germany
| | | | - Kerstin Seidel
- Institut für Pharmakologie und Toxikologie, Charité Campus Mitte, Charité–Universitätsmedizin Berlin, D-10117 Berlin, Germany
| | - Ludger Hauck
- Max Delbrück Center for Molecular Medicine, D-13125 Berlin, Germany
| | - Tina Baldinger
- Klinik und Poliklinik für Neurologie
- Neurowissenschaftliches Forschungszentrum, and
| | - Denise Hübner
- Klinik und Poliklinik für Neurologie
- Neurowissenschaftliches Forschungszentrum, and
| | - Golo Kronenberg
- Klinik und Poliklinik für Neurologie
- Klinik und Poliklinik für Psychiatrie, Charité Campus Benjamin Franklin, D-14050 Berlin, Germany, and
| | - Junfeng An
- Max Delbrück Center for Molecular Medicine, D-13125 Berlin, Germany
| | | | | | - Ulrich Dirnagl
- Abteilung für Experimentelle Neurologie, Charité–Universitätsmedizin Berlin, D-10117 Berlin, Germany
| | | | - Matthias Endres
- Klinik und Poliklinik für Neurologie
- Neurowissenschaftliches Forschungszentrum, and
| | - Heide Hörtnagl
- Institut für Pharmakologie und Toxikologie, Charité Campus Mitte, Charité–Universitätsmedizin Berlin, D-10117 Berlin, Germany
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Höti N, Chowdhury W, Hsieh JT, Sachs MD, Lupold SE, Rodriguez R. Valproic acid, a histone deacetylase inhibitor, is an antagonist for oncolytic adenoviral gene therapy. Mol Ther 2006; 14:768-78. [PMID: 16990052 DOI: 10.1016/j.ymthe.2006.07.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2005] [Revised: 07/31/2006] [Accepted: 07/31/2006] [Indexed: 10/24/2022] Open
Abstract
Oncolytic adenoviruses preferentially replicate in and lyse tumor cells. However, their application to cancer gene therapy has been complicated by the low levels of coxsackie and adenovirus receptor (CAR) expressed in many solid tumors. Histone deacetylase inhibitors (HDACIs) significantly up-regulate CAR expression in tumor cells and have additional antineoplastic activities. Therefore, there is a clear rationale for the combination of HDACIs and oncolytic adenoviral gene therapy. We present evidence that HDACI treatment significantly inhibits adenoviral replication, viral burst, and tumor cell kill. Valproic acid (VPA), a well-established HDACI, inhibits adenoviral replication late in the viral life cycle. We hypothesized that VPA induction of the cell-cycle-regulating protein p21(WAF1/CIP1) may be partly responsible for this activity. We demonstrate that p21(WAF1/CIP1) expression alone limits viral replication and decreases viral titers in different cancer cell models. We also demonstrate that VPA and replicating adenovirus mutually inhibit each other's ability to kill cells, independent of p21(WAF1/CIP1) expression. These results not only identify the importance of p21(WAF1/CIP1) in the biology of adenoviral replication, but also suggest that oncolytic adenoviral gene therapy will be inhibited rather than enhanced by VPA (HDACI) treatment.
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MESH Headings
- Adenoviruses, Human/drug effects
- Adenoviruses, Human/genetics
- Animals
- Blotting, Western
- Cell Line
- Cell Line, Tumor
- Cell Survival/drug effects
- Cell Survival/genetics
- Cyclin-Dependent Kinase Inhibitor p21/genetics
- Cyclin-Dependent Kinase Inhibitor p21/metabolism
- Dose-Response Relationship, Drug
- Enzyme Inhibitors/pharmacology
- Flow Cytometry
- Gene Expression Regulation, Viral/drug effects
- Genetic Therapy/methods
- HCT116 Cells
- Histone Deacetylase Inhibitors
- Humans
- Mice
- Mice, Nude
- Neoplasms, Experimental/metabolism
- Neoplasms, Experimental/pathology
- Neoplasms, Experimental/therapy
- Oncolytic Viruses/drug effects
- Oncolytic Viruses/genetics
- Valproic Acid/pharmacology
- Virus Replication/drug effects
- Xenograft Model Antitumor Assays/methods
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Affiliation(s)
- Naseruddin Höti
- Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
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46
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Griffin SV, Olivier JP, Pippin JW, Roberts JM, Shankland SJ. Cyclin I Protects Podocytes from Apoptosis. J Biol Chem 2006; 281:28048-57. [PMID: 16847066 DOI: 10.1074/jbc.m513336200] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The limited regenerative capacity of the glomerular podocyte following injury underlies the development of glomerulosclerosis and progressive renal failure in a diverse range of kidney diseases. We discovered that, in the kidney, cyclin I is uniquely expressed in the glomerular podocyte, and have constructed cyclin I knock-out mice to explore the biological function of cyclin I in these cells. Cyclin I knock-out (-/-) podocytes showed an increased susceptibility to apoptosis both in vitro and in vivo. Following induction of experimental glomerulonephritis, podocyte apoptosis was increased 4-fold in the cyclin I -/- mice, which was associated with dramatically decreased renal function. Our previous data showed that the Cdk inhibitor p21(Cip1/Waf1) protects podocytes from certain apoptotic stimuli. In cultured cyclin I -/- podocytes, the level of p21(Cip1/Waf1) was lower at base line, had a shorter half-life, and declined more rapidly in response to apoptotic stimuli than in wild-type cells. Enforced expression of p21(Cip1/Waf1) reversed the susceptibility of cyclin I -/- podocytes to apoptosis. Cyclin I protects podocytes from apoptosis, and we provide preliminary data to suggest that this is mediated by stabilization of p21(Cip1/Waf1).
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Affiliation(s)
- Siân V Griffin
- Department of Medicine, Division of Nephrology, University of Washington School of Medicine, Seattle, 98195, USA
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47
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Tang JJ, Shen C, Lu YJ. Requirement for pre-existing of p21 to prevent doxorubicin-induced apoptosis through inhibition of caspase-3 activation. Mol Cell Biochem 2006; 291:139-44. [PMID: 16909308 DOI: 10.1007/s11010-006-9206-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2006] [Accepted: 03/28/2006] [Indexed: 12/16/2022]
Abstract
Doxorubicin (DOX)-induced apoptosis is suppressed by p21 (waf1/cip1/sdi1), a cyclin dependent kinase (CDK) inhibitor. Here we show that exogenous expression of p21 before, but not after, the DOX-treatment protected p21-deficient human colorectal cancer cell line DLD1 from DOX-induced apoptosis. In previous work, we demonstrated that p21 inhibits DOX-induced apoptosis via its CDK-binding and CDK-inhibitory activity. Here we report that pre-existing p21 can associate with pro-caspase-3 and inhibit caspase-3 activation in the cells, which was at least in part responsible for enhancing survival of DOX-treated cells. Furthermore, the N-terminal domain of p21 was found to interact with pro-caspase-3 in DLD1 cells. Thus, we propose that pre-existing p21 is required to prevent DOX-induced apoptosis.
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Affiliation(s)
- J J Tang
- Cancer Research Center, Celstar Bio-Pharmaceutical Co. Ltd., Shanghai, PR China
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48
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Rokhlin OW, Glover RB, Guseva NV, Taghiyev AF, Kohlgraf KG, Cohen MB. Mechanisms of Cell Death Induced by Histone Deacetylase Inhibitors in Androgen Receptor–Positive Prostate Cancer Cells. Mol Cancer Res 2006; 4:113-23. [PMID: 16513842 DOI: 10.1158/1541-7786.mcr-05-0085] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Histone deacetylase inhibitors (HDACI) are potential therapeutic agents that inhibit tumor cell growth and survival. Although there are several publications regarding the effects of HDACIs on prostate cancer cell growth, their mechanism(s) of action remains undefined. We treated several human prostate cancer cell lines with the HDACI trichostatin A and found that trichostatin A induced cell death in androgen receptor (AR)-positive cell lines to higher extent compared with AR-negative cell lines. We then discovered that trichostatin A and other HDACIs suppressed AR gene expression in prostate cancer cell lines as well as in AR-positive breast carcinoma cells and in mouse prostate. Trichostatin A also induced caspase activation, but trichostatin A-induced AR suppression and cell death were caspase independent. In addition, we found that doxorubicin inhibited AR expression, and p21 protein completely disappeared after simultaneous treatment with trichostatin A and doxorubicin. This effect may be attributed to the induction of protease activity under simultaneous treatment with these two agents. Further, simultaneous treatment with trichostatin A and doxorubicin increased cell death in AR-positive cells even after culturing in steroid-free conditions. The protease/proteasome inhibitor MG132 protected AR and p21 from the effects of trichostatin A and doxorubicin and inhibited trichostatin A-induced cell death in AR-positive prostate cells. Taken together, our data suggest that the main mechanism of trichostatin A-induced cell death in AR-positive prostate cancer is inhibition of AR gene expression. The synergistic effect of simultaneous treatment with trichostatin A and doxorubicin is mediated via inhibition of AR expression, induction of protease activity, increased expression of p53, and proteolysis of p21.
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Affiliation(s)
- Oskar W Rokhlin
- Department of Pathology, University of Iowa, Iowa City, IA 52242, USA.
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Burkhardt BR, Greene SR, White P, Wong RK, Brestelli JE, Yang J, Robert CE, Brusko TM, Wasserfall CH, Wu J, Atkinson MA, Gao Z, Kaestner KH, Wolf BA. PANDER-induced cell-death genetic networks in islets reveal central role for caspase-3 and cyclin-dependent kinase inhibitor 1A (p21). Gene 2006; 369:134-41. [PMID: 16412588 DOI: 10.1016/j.gene.2005.10.040] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2005] [Revised: 10/28/2005] [Accepted: 10/29/2005] [Indexed: 11/18/2022]
Abstract
PANcreatic DERived factor is an islet-specific cytokine that promotes apoptosis in primary islets and islet cell lines. To elucidate the genetic mechanisms of PANDER-induced cell death we performed expression profiling using the mouse PancChip version 5.0 in conjunction with Ingenuity Pathway Analysis. Murine islets were treated with PANDER and differentially expressed genes were identified at 48 and 72 h post-treatment. 64 genes were differentially expressed in response to PANDER treatment. 22 genes are associated with cell death. In addition, the genes with the highest fold change were linked with cell death or apoptosis. The most significantly affected gene at 48 h was the downregulated cyclin-dependent kinase inhibitor 1A (CDKN1A or p21). Approximately half of the genes impacted at 72 h were linked to cell death. Cell death differentially expressed genes were confirmed by quantitative RT-PCR. Further analysis identified cell death genetic networks at both time points with 21 of the 22 cell death genes related in various biological pathways. Caspase-3 (CASP3) was biologically linked to CDKN1A in several genetic networks and these two genes were further examined. Elevated cleaved CASP3 levels in PANDER-treated beta-TC3 insulinoma cells were found to abrogate CDKN1A expression. Levels of CDKN1A were not affected in the absence of cleaved CASP3. PANDER-induced downregulation of CDKN1A expression coupled with induced CASP3-activation may serve a central role in islet cell death and offers further insight into the mechanisms of cytokine-induced beta-cell apoptosis.
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Affiliation(s)
- Brant R Burkhardt
- Department of Pathology and Laboratory Medicine, 803D Abramson Research Center 3516 Civic Center Blvd., Children's Hospital of Philadelphia, Philadelphia, PA 19104-4318, United States.
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Huang BH, Laban M, Leung CHW, Lee L, Lee CK, Salto-Tellez M, Raju GC, Hooi SC. Inhibition of histone deacetylase 2 increases apoptosis and p21Cip1/WAF1 expression, independent of histone deacetylase 1. Cell Death Differ 2005; 12:395-404. [PMID: 15665816 DOI: 10.1038/sj.cdd.4401567] [Citation(s) in RCA: 256] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Histone deacetylases (HDACs) 1 and 2 share a high degree of homology and coexist within the same protein complexes. Despite their close association, each possesses unique functions. We show that the upregulation of HDAC2 in colorectal cancer occurred early at the polyp stage, was more robust and occurred more frequently than HDAC1. Similarly, while the expression of HDACs1 and 2 were increased in cervical dysplasia and invasive carcinoma, HDAC2 expression showed a clear demarcation of high-intensity staining at the transition region of dysplasia compared to HDAC1. Upon HDAC2 knockdown, cells displayed an increased number of cellular extensions reminiscent of cell differentiation. There was also an increase in apoptosis, associated with increased p21Cip1/WAF1 expression that was independent of p53. These results suggest that HDACs, especially HDAC2, are important enzymes involved in the early events of carcinogenesis, making them candidate markers for tumor progression and targets for cancer therapy.
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Affiliation(s)
- B H Huang
- Department of Physiology, Faculty of Medicine, National University of Singapore, Singapore
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