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Gao X, Li B, Ye A, Wang H, Xie Y, Yu D, Xu Z, Shi B, Zhang H, Feng Q, Hu K, Zhang Y, Huang C, Yang G, Shi J, Zhu W. A novel phosphoramide compound, DCZ0805, shows potent anti-myeloma activity via the NF-κB pathway. Cancer Cell Int 2021; 21:285. [PMID: 34053438 PMCID: PMC8165811 DOI: 10.1186/s12935-021-01973-1] [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] [Received: 03/02/2021] [Accepted: 05/05/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Multiple myeloma (MM) is a highly aggressive and incurable clonal plasma cell disease with a high rate of recurrence. Thus, the development of new therapies is urgently needed. DCZ0805, a novel compound synthesized from osalmide and pterostilbene, has few observed side effects. In the current study, we intend to investigate the therapeutic effects of DCZ0805 in MM cells and elucidate the molecular mechanism underlying its anti-myeloma activity. METHODS We used the Cell Counting Kit-8 assay, immunofluorescence staining, cell cycle assessment, apoptosis assay, western blot analysis, dual-luciferase reporter assay and a tumor xenograft mouse model to investigate the effect of DCZ0805 treatment both in vivo and in vitro. RESULTS The results showed that DCZ0805 treatment arrested the cell at the G0/G1 phase and suppressed MM cells survival by inducing apoptosis via extrinsic and intrinsic pathways. DCZ0805 suppressed the NF-κB signaling pathway activation, which may have contributed to the inhibition of cell proliferation. DCZ0805 treatment remarkably reduced the tumor burden in the immunocompromised xenograft mouse model, with no obvious toxicity observed. CONCLUSION The findings of this study indicate that DCZ0805 can serve as a novel therapeutic agent for the treatment of MM.
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Affiliation(s)
- Xuejie Gao
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Bo Li
- CAS Key Laboratory of Receptor Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, China
| | - Anqi Ye
- Shanghai Children's Medical Center, Shanghai JiaoTong University School of Medicine, Shanghai, People's Republic of China
| | - Houcai Wang
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Yongsheng Xie
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Dandan Yu
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Zhijian Xu
- CAS Key Laboratory of Receptor Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, China
| | - Bingqing Shi
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Hui Zhang
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Qilin Feng
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Ke Hu
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Yong Zhang
- CAS Key Laboratory of Receptor Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, China
| | - Cheng Huang
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Guang Yang
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China
| | - Jumei Shi
- Department of Hematology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai, 200072, China.
| | - Weiliang Zhu
- CAS Key Laboratory of Receptor Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, China.
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The Role of CDKs and CDKIs in Murine Development. Int J Mol Sci 2020; 21:ijms21155343. [PMID: 32731332 PMCID: PMC7432401 DOI: 10.3390/ijms21155343] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 07/22/2020] [Accepted: 07/26/2020] [Indexed: 02/07/2023] Open
Abstract
Cyclin-dependent kinases (CDKs) and their inhibitors (CDKIs) play pivotal roles in the regulation of the cell cycle. As a result of these functions, it may be extrapolated that they are essential for appropriate embryonic development. The twenty known mouse CDKs and eight CDKIs have been studied to varying degrees in the developing mouse, but only a handful of CDKs and a single CDKI have been shown to be absolutely required for murine embryonic development. What has become apparent, as more studies have shone light on these family members, is that in addition to their primary functional role in regulating the cell cycle, many of these genes are also controlling specific cell fates by directing differentiation in various tissues. Here we review the extensive mouse models that have been generated to study the functions of CDKs and CDKIs, and discuss their varying roles in murine embryonic development, with a particular focus on the brain, pancreas and fertility.
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Pozzoli G, Petrucci G, Navarra P, Marei HE, Cenciarelli C. Aspirin inhibits proliferation and promotes differentiation of neuroblastoma cells via p21 Waf1 protein up-regulation and Rb1 pathway modulation. J Cell Mol Med 2019; 23:7078-7087. [PMID: 31429199 PMCID: PMC6787451 DOI: 10.1111/jcmm.14610] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 08/06/2019] [Accepted: 08/07/2019] [Indexed: 02/06/2023] Open
Abstract
Several clinical and experimental studies have demonstrated that regular use of aspirin (acetylsalicylic acid, ASA) correlates with a reduced risk of cancer and that the drug exerts direct anti‐tumour effects. We have previously reported that ASA inhibits proliferation of human glioblastoma multiforme‐derived cancer stem cells. In the present study, we analysed the effects of ASA on nervous system‐derived cancer cells, using the SK‐N‐SH (N) human neuroblastoma cell line as an experimental model. ASA treatment of SK‐N‐SH (N) dramatically reduced cell proliferation and motility, and induced neuronal‐like differentiation, indicated by the appearance of the neuronal differentiation marker tyrosine hydroxylase (TH) after 5 days. ASA did not affect cell viability, but caused a time‐dependent accumulation of cells in the G0/G1 phase of the cell cycle, with a concomitant decrease in the percentage of cells in the G2 phase. These effects appear to be mediated by a COX‐independent mechanism involving an increase in p21Waf1 and underphosphorylated retinoblastoma (hypo‐pRb1) protein levels. These findings may support a potential role of ASA as adjunctive therapeutic agent in the clinical management of neuroblastoma.
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Affiliation(s)
- Giacomo Pozzoli
- Institute of Pharmacology, Università Cattolica del Sacro Cuore, Rome, Italy.,Pharmacology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Giovanna Petrucci
- Institute of Pharmacology, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Pierluigi Navarra
- Institute of Pharmacology, Università Cattolica del Sacro Cuore, Rome, Italy.,Pharmacology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Hany E Marei
- Department of Cytology and Histology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Carlo Cenciarelli
- Institute of Translational Pharmacology (IFT), National Research Council (CNR), Rome, Italy
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Wu CH, Liu FC, Pan CH, Lai MT, Lan SJ, Wu CH, Sheu MJ. Suppression of Cell Growth, Migration and Drug Resistance by Ethanolic Extract of Antrodia cinnamomea in Human Lung Cancer A549 Cells and C57BL/6J Allograft Tumor Model. Int J Mol Sci 2018. [PMID: 29522490 PMCID: PMC5877652 DOI: 10.3390/ijms19030791] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The purpose of this study was to investigate the inhibitory activities of ethanolic extracts from Antrodia cinnamomea (EEAC) on lung cancer. Cell proliferation and cell cycle distribution were analyzed using (3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) (MTT) assay and flow cytometry, respectively. Wound-healing assay, Western blotting, and a murine tumor model were separately used to examine cell migration, protein expression, and tumor repression. Our results showed that EEAC induced cell cycle arrest at the G0/G1 phase resulting decreased cell viability in A549 cells. Moreover, EEAC up-regulated the growth-suppressing proteins, adenosine 5′-monophosphate-activated protein kinase (AMPK), p21 and p27, but down-regulated the growth-promoting proteins, protein kinase B (Akt), mammalian tarfet of rapamycin (mTOR), extracellular signal-regulating kinase 1/2 (ERK1/2), retinoblastoma protein (Rb), cyclin E, and cyclin D1. EEAC also inhibited A549 cell migration and reduced expression of gelatinases. In addition, our data showed that tumor growth was suppressed after treatment with EEAC in a murine allograft tumor model. Some bioactive compounds from EEAC, such as cordycepin and zhankuic acid A, were demonstrated to reduce the protein expressions of matrix metalloproteinase (MMP)-9 and cyclin D1 in A549 cells. Furthermore, EEAC enhanced chemosensitivity of A549 to paclitaxel by reducing the protein levels of caveolin-1. Our data suggests that EEAC has the potential to be an adjuvant medicine for the treatment of lung cancer.
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Affiliation(s)
- Chi-Han Wu
- School of Pharmacy, China Medical University, Taichung 40402, Taiwan.
| | - Fon-Chang Liu
- School of Pharmacy, China Medical University, Taichung 40402, Taiwan.
| | - Chun-Hsu Pan
- School of Pharmacy, Taipei Medical University, Taipei 11031, Taiwan.
| | - Ming-Tsung Lai
- Department of Pathology, Taichung Hospital, Ministry of Health and Welfare Taiwan, Taichung 40343, Taiwan.
| | - Shou-Jen Lan
- Department of Healthcare Administration, Asia University, Taichung 41354, Taiwan.
| | - Chieh-Hsi Wu
- School of Pharmacy, Taipei Medical University, Taipei 11031, Taiwan.
| | - Ming-Jyh Sheu
- School of Pharmacy, China Medical University, Taichung 40402, Taiwan.
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5
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Ngoc NB, Lv P, Zhao WE. Suppressive effects of lycopene and β-carotene on the viability of the human esophageal squamous carcinoma cell line EC109. Oncol Lett 2018; 15:6727-6732. [PMID: 29731858 DOI: 10.3892/ol.2018.8175] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 01/10/2018] [Indexed: 12/24/2022] Open
Abstract
The molecular mechanisms underlying the chemopreventive effects of carotenoids in different types of cancer are receiving increasing attention. In the present study, the role of peroxisome proliferator-activated receptor γ (PPARγ) in the effect of lycopene and β-carotene on the viability of EC109 human esophageal squamous carcinoma cells was investigated. The viability of EC109 cells was evaluated using MTT assays. The effects of lycopene and β-carotene on the expression of PPARγ, p21WAF1/CIP1, cyclin D1 and cyclooxygenase-2 (COX-2) were analyzed by western blotting. Lycopene and β-carotene (5-40 µM) dose- and time-dependently reduced the viability of the EC109 cells. GW9662, an irreversible PPARγ antagonist, partly attenuated the decrease in EC109 cell viability induced by these carotenoids. Lycopene and β-carotene treatments upregulated the expression of PPARγ and p21WAF1/CIP1, and downregulated the expression of cyclin D1 and COX-2. These modulatory effects of the carotenoid treatments were suppressed by GW9662, suggesting that the inhibition of EC109 cell viability by lycopene and β-carotene involves PPARγ signaling pathways and the modulation of p21WAF1/CIP1, cyclin D1 and COX-2 expression.
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Affiliation(s)
- Nguyen Ba Ngoc
- School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China.,Faculty of Food Industry, College of Food Industry, Danang 550000, Vietnam
| | - Pin Lv
- School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China.,School of Pharmacy, Henan University of Traditional Chinese Medicine, Zhengzhou, Henan 450046, P.R. China
| | - Wen-En Zhao
- School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China
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6
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Irazoqui AP, Boland RL, Buitrago CG. Actions of 1,25(OH)2-vitamin D3 on the cellular cycle depend on VDR and p38 MAPK in skeletal muscle cells. J Mol Endocrinol 2014; 53:331-43. [PMID: 25316911 DOI: 10.1530/jme-14-0102] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Previously, we have reported that 1,25(OH)2-vitamin D3 (1,25D) activates p38 MAPK (p38) in a vitamin D receptor (VDR)-dependent manner in proliferative C2C12 myoblast cells. It was also demonstrated that 1,25D promotes muscle cell proliferation and differentiation. However, we did not study these hormone actions in depth. In this study we have investigated whether the VDR and p38 participate in the signaling mechanism triggered by 1,25D. In C2C12 cells, the VDR was knocked down by a shRNA, and p38 was specifically inhibited using SB-203580. Results from cell cycle studies indicated that hormone stimulation prompts a peak of S-phase followed by an arrest in the G0/G1-phase, events which were dependent on VDR and p38. Moreover, 1,25D increases the expression of cyclin D3 and the cyclin-dependent kinase inhibitors, p21(Waf1/Cip1) and p27(Kip1), while cyclin D1 protein levels did not change during G0/G1 arrest. In all these events, p38 and VDR were required. At the same time, a 1,25D-dependent acute increase in myogenin expression was observed, indicating that the G0/G1 arrest of cells is a pro-differentiative event. Immunocytochemical assays revealed co-localization of VDR and cyclin D3, promoted by 1,25D in a p38-dependent manner. When cyclin D3 expression was silenced, VDR and myogenin levels were downregulated, indicating that cyclin D3 was required for 1,25D-induced VDR expression and the concomitant entrance into the differentiation process. In conclusion, the VDR and p38 are involved in control of the cellular cycle by 1,25D in skeletal muscle cells, providing key information on the mechanisms underlying hormone regulation of myogenesis.
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Affiliation(s)
- Ana P Irazoqui
- INBIOSUR - CONICETDepartamento de Biología, Bioquímica and Farmacia, Universidad Nacional del Sur, San Juan 670, 8000 Bahía Blanca, Argentina
| | - Ricardo L Boland
- INBIOSUR - CONICETDepartamento de Biología, Bioquímica and Farmacia, Universidad Nacional del Sur, San Juan 670, 8000 Bahía Blanca, Argentina
| | - Claudia G Buitrago
- INBIOSUR - CONICETDepartamento de Biología, Bioquímica and Farmacia, Universidad Nacional del Sur, San Juan 670, 8000 Bahía Blanca, Argentina
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7
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Anticancer and multidrug resistance-reversal effects of solanidine analogs synthetized from pregnadienolone acetate. Molecules 2014; 19:2061-76. [PMID: 24549231 PMCID: PMC6271930 DOI: 10.3390/molecules19022061] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 01/29/2014] [Accepted: 02/06/2014] [Indexed: 12/18/2022] Open
Abstract
A set of solanidine analogs with antiproliferative properties were recently synthetized from pregnadienolone acetate, which occurs in Nature. The aim of the present study was an in vitro characterization of their antiproliferative action and an investigation of their multidrug resistance-reversal activity on cancer cells. Six of the compounds elicited the accumulation of a hypodiploid population of HeLa cells, indicating their apoptosis-inducing character, and another one caused cell cycle arrest at the G2/M phase. The most effective agents inhibited the activity of topoisomerase I, as evidenced by plasmid supercoil relaxation assays. One of the most potent analogs down-regulated the expression of cell-cycle related genes at the mRNA level, including tumor necrosis factor alpha and S-phase kinase-associated protein 2, and induced growth arrest and DNA damage protein 45 alpha. Some of the investigated compounds inhibited the ABCB1 transporter and caused rhodamine-123 accumulation in murine lymphoma cells transfected by human MDR1 gene, expressing the efflux pump (L5178). One of the most active agents in this aspect potentiated the antiproliferative action of doxorubicin without substantial intrinsic cytostatic capacity. The current results indicate that the modified solanidine skeleton is a suitable substrate for the rational design and synthesis of further innovative drug candidates with anticancer activities.
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8
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Irazoqui AP, Boland RL, Buitrago CG. WITHDRAWN: VDR involvement in 1a,25-dihydroxyvitamin D3-action on cellular cycle in C2C12 skeletal muscle cells. J Steroid Biochem Mol Biol 2013:S0960-0760(13)00214-8. [PMID: 24184698 DOI: 10.1016/j.jsbmb.2013.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 10/18/2013] [Accepted: 10/23/2013] [Indexed: 11/30/2022]
Abstract
This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
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Affiliation(s)
- Ana P Irazoqui
- Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, 8000 Bahía Blanca, Argentina
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9
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Alcazar O, Achberger S, Aldrich W, Hu Z, Negrotto S, Saunthararajah Y, Triozzi P. Epigenetic regulation by decitabine of melanoma differentiation in vitro and in vivo. Int J Cancer 2012; 131:18-29. [PMID: 21796622 PMCID: PMC3454528 DOI: 10.1002/ijc.26320] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Revised: 06/07/2011] [Accepted: 07/01/2011] [Indexed: 01/20/2023]
Abstract
Apoptosis genes, such as TP53 and p16/CDKN2A, that mediate responses to cytotoxic chemotherapy, are frequently nonfunctional in melanoma. Differentiation may be an alternative to apoptosis for inducing melanoma cell cycle exit. Epigenetic mechanisms regulate differentiation, and DNA methylation alterations are associated with the abnormal differentiation of melanoma cells. The effects of the deoxycytidine analogue decitabine (5-aza-2'-deoxycytidine), which depletes DNA methyl transferase 1 (DNMT1), on melanoma differentiation were examined. Treatment of human and murine melanoma cells in vitro with concentrations of decitabine that did not cause apoptosis inhibited proliferation accompanied by cellular differentiation. A decrease in promoter methylation, and increase in expression of the melanocyte late-differentiation driver SOX9, was followed by increases in cyclin-dependent kinase inhibitors (CDKN) p27/CDKN1B and p21/CDKN1A that mediate cell cycle exit with differentiation. Effects were independent of the TP53, p16/CDKN2A and also the BRAF status of the melanoma cells. Resistance, when observed, was pharmacologic, characterized by diminished ability of decitabine to deplete DNMT1. Treatment of murine melanoma models in vivo with intermittent, low-dose decitabine, administered sub-cutaneously to limit high peak drug levels that cause cytotoxicity and increase exposure time for DNMT1 depletion, and with tetrahydrouridine to decrease decitabine metabolism and further increase exposure time, inhibited tumor growth and increased molecular and tumor stromal factors implicated in melanocyte differentiation. Modification of decitabine dose, schedule and formulation for differentiation rather than cytotoxic objectives inhibits the growth of melanoma cells in vitro and in vivo.
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MESH Headings
- Animals
- Antimetabolites, Antineoplastic/pharmacology
- Apoptosis
- Azacitidine/administration & dosage
- Azacitidine/analogs & derivatives
- Azacitidine/pharmacology
- Base Sequence
- Cell Differentiation/drug effects
- Cell Line, Tumor
- Cell Proliferation/drug effects
- Cyclin-Dependent Kinase Inhibitor Proteins/biosynthesis
- Cyclin-Dependent Kinase Inhibitor p16/metabolism
- DNA (Cytosine-5-)-Methyltransferase 1
- DNA (Cytosine-5-)-Methyltransferases/analysis
- DNA (Cytosine-5-)-Methyltransferases/metabolism
- DNA Methylation
- Decitabine
- Epigenesis, Genetic
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- Male
- Melanoma, Experimental/drug therapy
- Melanoma, Experimental/genetics
- Melanoma, Experimental/metabolism
- Melanoma, Experimental/pathology
- Mice
- Mice, Inbred C57BL
- Mice, Nude
- Promoter Regions, Genetic/genetics
- Proto-Oncogene Proteins B-raf/biosynthesis
- SOX9 Transcription Factor/biosynthesis
- Sequence Analysis, DNA
- Tetrahydrouridine/pharmacology
- Tumor Suppressor Protein p53/metabolism
- Up-Regulation
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Affiliation(s)
- Oscar Alcazar
- Taussig Cancer Institute, Cleveland Clinic Foundation, Cleveland, Ohio, USA
| | - Susan Achberger
- Taussig Cancer Institute, Cleveland Clinic Foundation, Cleveland, Ohio, USA
| | - Wayne Aldrich
- Taussig Cancer Institute, Cleveland Clinic Foundation, Cleveland, Ohio, USA
| | - Zhenbo Hu
- Taussig Cancer Institute, Cleveland Clinic Foundation, Cleveland, Ohio, USA
| | - Soledad Negrotto
- Taussig Cancer Institute, Cleveland Clinic Foundation, Cleveland, Ohio, USA
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DLK1 Promotes Neurogenesis of Human and Mouse Pluripotent Stem Cell-Derived Neural Progenitors Via Modulating Notch and BMP Signalling. Stem Cell Rev Rep 2011; 8:459-71. [DOI: 10.1007/s12015-011-9298-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Bryja V, Pacherník J, Vondráček J, Souček K, Čajánek L, Horvath V, Holubcová Z, Dvořák P, Hampl A. Lineage specific composition of cyclin D-CDK4/CDK6-p27 complexes reveals distinct functions of CDK4, CDK6 and individual D-type cyclins in differentiating cells of embryonic origin. Cell Prolif 2008; 41:875-893. [PMID: 19040567 PMCID: PMC2659368 DOI: 10.1111/j.1365-2184.2008.00556.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Abstract. Objectives: This article is to study the role of G1/S regulators in differentiation of pluripotent embryonic cells. Materials and methods: We established a P19 embryonal carcinoma cell‐based experimental system, which profits from two similar differentiation protocols producing endodermal or neuroectodermal lineages. The levels, mutual interactions, activities, and localization of G1/S regulators were analysed with respect to growth and differentiation parameters of the cells. Results and Conclusions: We demonstrate that proliferation parameters of differentiating cells correlate with the activity and structure of cyclin A/E–CDK2 but not of cyclin D–CDK4/6–p27 complexes. In an exponentially growing P19 cell population, the cyclin D1–CDK4 complex is detected, which is replaced by cyclin D2/3–CDK4/6–p27 complex following density arrest. During endodermal differentiation kinase‐inactive cyclin D2/D3–CDK4–p27 complexes are formed. Neural differentiation specifically induces cyclin D1 at the expense of cyclin D3 and results in predominant formation of cyclin D1/D2–CDK4–p27 complexes. Differentiation is accompanied by cytoplasmic accumulation of cyclin Ds and CDK4/6, which in neural cells are associated with neural outgrowths. Most phenomena found here can be reproduced in mouse embryonic stem cells. In summary, our data demonstrate (i) that individual cyclin D isoforms are utilized in cells lineage specifically, (ii) that fundamental difference in the function of CDK4 and CDK6 exists, and (iii) that cyclin D–CDK4/6 complexes function in the cytoplasm of differentiated cells. Our study unravels another level of complexity in G1/S transition‐regulating machinery in early embryonic cells.
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Affiliation(s)
- V Bryja
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic,Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic,Center for Cell Therapy and Tissue Repair, Charles University, Prague, Czech Republic,Department of Molecular Embryology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic, andDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - J Pacherník
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic,Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic,Center for Cell Therapy and Tissue Repair, Charles University, Prague, Czech Republic,Department of Molecular Embryology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic, andDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - J Vondráček
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic,Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic,Center for Cell Therapy and Tissue Repair, Charles University, Prague, Czech Republic,Department of Molecular Embryology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic, andDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - K Souček
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic,Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic,Center for Cell Therapy and Tissue Repair, Charles University, Prague, Czech Republic,Department of Molecular Embryology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic, andDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - L Čajánek
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic,Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic,Center for Cell Therapy and Tissue Repair, Charles University, Prague, Czech Republic,Department of Molecular Embryology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic, andDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - V Horvath
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic,Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic,Center for Cell Therapy and Tissue Repair, Charles University, Prague, Czech Republic,Department of Molecular Embryology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic, andDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Z Holubcová
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic,Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic,Center for Cell Therapy and Tissue Repair, Charles University, Prague, Czech Republic,Department of Molecular Embryology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic, andDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - P Dvořák
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic,Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic,Center for Cell Therapy and Tissue Repair, Charles University, Prague, Czech Republic,Department of Molecular Embryology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic, andDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - A Hampl
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic,Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic,Center for Cell Therapy and Tissue Repair, Charles University, Prague, Czech Republic,Department of Molecular Embryology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic, andDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
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Haley SA, Zhao T, Zou L, Klysik JE, Padbury JF, Kochilas LK. Forced expression of the cell cycle inhibitor p57Kip2 in cardiomyocytes attenuates ischemia-reperfusion injury in the mouse heart. BMC PHYSIOLOGY 2008; 8:4. [PMID: 18312674 PMCID: PMC2268709 DOI: 10.1186/1472-6793-8-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Accepted: 02/29/2008] [Indexed: 01/04/2023]
Abstract
Background Myocardial hypoxic-ischemic injury is the cause of significant morbidity and mortality worldwide. The cardiomyocyte response to hypoxic-ischemic injury is known to include changes in cell cycle regulators. The cyclin-dependent kinase inhibitor p57Kip2 is involved in cell cycle control, differentiation, stress signaling and apoptosis. In contrast to other cyclin-dependent kinase inhibitors, p57Kip2 expression diminishes during postnatal life and is reactivated in the adult heart under conditions of cardiac stress. Overexpression of p57Kip2 has been previously shown to prevent apoptotic cell death in vitro by inhibiting stress-activated kinases. Therefore, we hypothesized that p57Kip2 has a protective role in cardiomyocytes under hypoxic conditions. To investigate this hypothesis, we created a transgenic mouse (R26loxpTA-p57k/+) that expresses p57Kip2 specifically in cardiac tissue under the ventricular cardiomyocyte promoter Mlc2v. Results Transgenic mice with cardiac specific overexpression of p57Kip2 are viable, fertile and normally active and their hearts are morphologically indistinguishable from the control hearts and have similar heart weight/body weight ratio. The baseline functional parameters, including left ventricular systolic pressure (LVSP), left ventricular end diastolic pressure (LVEDP), LVdp/dtmax, heart rate (HR) and rate pressure product (RPR) were not significantly different between the different groups as assessed by the Langendorff perfused heart preparation. However, after subjecting the heart ex vivo to 30 minutes of ischemia-reperfusion injury, the p57Kip2 overexpressing hearts demonstrated preserved cardiac function compared to control mice with higher left ventricular developed pressure (63 ± 15 vs 30 ± 6 mmHg, p = 0.05), rate pressure product (22.8 ± 4.86 vs 10.4 ± 2.1 × 103bpm × mmHg, p < 0.05) and coronary flow (3.5 ± 0.5 vs 2.38 ± 0.24 ml/min, p <0.05). Conclusion These data suggest that forced cardiac expression of p57Kip2 does not affect myocardial growth, differentiation and baseline function but attenuates injury from ischemia-reperfusion in the adult mouse heart.
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Affiliation(s)
- Sheila A Haley
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912, USA.
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13
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Lwin T, Hazlehurst LA, Dessureault S, Lai R, Bai W, Sotomayor E, Moscinski LC, Dalton WS, Tao J. Cell adhesion induces p27Kip1-associated cell-cycle arrest through down-regulation of the SCFSkp2 ubiquitin ligase pathway in mantle-cell and other non-Hodgkin B-cell lymphomas. Blood 2007; 110:1631-8. [PMID: 17502456 PMCID: PMC1975846 DOI: 10.1182/blood-2006-11-060350] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Mounting evidence suggests that dynamic interactions between a tumor and its microenvironment play a critical role in tumor development, cell-cycle progression, and response to therapy. In this study, we used mantle cell lymphoma (MCL) as a model to characterize the mechanisms by which stroma regulate cell-cycle progression. We demonstrated that adhesion of MCL and other non-Hodgkin lymphoma (NHL) cells to bone marrow stromal cells resulted in a reversible G(1) arrest associated with elevated p27(Kip1) and p21 (WAF1) proteins. The adhesion-mediated p27(Kip1) and p21 increases were posttranslationally regulated via the down-regulation of Skp2, a subunit of SCF(Skp2) ubiquitin ligase. Overexpression of Skp2 in MCL decreased p27(Kip1), whereas inhibition of Skp2 by siRNA increased p27(Kip1) and p21 levels. Furthermore, we found cell adhesion up-regulated Cdh1 (an activating subunit of anaphase-promoting complex [APC] ubiquitin ligase), and reduction of Cdh1 by siRNA induced Skp2 accumulation and hence p27(Kip1) degradation, thus implicating Cdh1 as an upstream effector of the Skp2/p27(Kip1) signaling pathway. Overall, this report, for the first time, demonstrates that cell-cell contact controls the tumor cell cycle via ubiquitin-proteasome proteolytic pathways in MCL and other NHLs. The understanding of this novel molecular pathway may prove valuable in designing new therapeutic approaches for modifying tumor cell growth and response to therapy.
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MESH Headings
- Anaphase-Promoting Complex-Cyclosome
- Antigens, CD
- Bone Marrow Cells/metabolism
- Bone Marrow Cells/pathology
- Cadherins/genetics
- Cadherins/metabolism
- Cell Adhesion/drug effects
- Cell Adhesion/genetics
- Cell Line, Tumor
- Cyclin-Dependent Kinase Inhibitor p21/genetics
- Cyclin-Dependent Kinase Inhibitor p21/metabolism
- Cyclin-Dependent Kinase Inhibitor p27
- G1 Phase/drug effects
- G1 Phase/genetics
- Humans
- Intracellular Signaling Peptides and Proteins/antagonists & inhibitors
- Intracellular Signaling Peptides and Proteins/genetics
- Intracellular Signaling Peptides and Proteins/metabolism
- Lymphoma, B-Cell/enzymology
- Lymphoma, B-Cell/genetics
- Lymphoma, B-Cell/pathology
- Lymphoma, B-Cell/therapy
- Lymphoma, Mantle-Cell/enzymology
- Lymphoma, Mantle-Cell/genetics
- Lymphoma, Mantle-Cell/pathology
- Lymphoma, Mantle-Cell/therapy
- Models, Biological
- Neoplasm Proteins/antagonists & inhibitors
- Neoplasm Proteins/genetics
- Neoplasm Proteins/metabolism
- Proteasome Endopeptidase Complex/genetics
- Proteasome Endopeptidase Complex/metabolism
- RNA, Small Interfering/metabolism
- RNA, Small Interfering/pharmacology
- S-Phase Kinase-Associated Proteins/antagonists & inhibitors
- S-Phase Kinase-Associated Proteins/genetics
- S-Phase Kinase-Associated Proteins/metabolism
- Signal Transduction/drug effects
- Signal Transduction/genetics
- Stromal Cells/metabolism
- Stromal Cells/pathology
- Ubiquitin/genetics
- Ubiquitin/metabolism
- Ubiquitin-Protein Ligase Complexes/genetics
- Ubiquitin-Protein Ligase Complexes/metabolism
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Affiliation(s)
- Tint Lwin
- Department of Interdisciplinary Oncology and Experimental Therapeutics Program, H. Lee Moffitt Cancer Center and Research Institute at the University of South Florida, Tampa, FL 33613, USA
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14
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Wang J, Lv XW, Shi JP, Hu XS. Mechanisms involved in ceramide-induced cell cycle arrest in human hepatocarcinoma cells. World J Gastroenterol 2007; 13:1129-34. [PMID: 17373752 PMCID: PMC4146880 DOI: 10.3748/wjg.v13.i7.1129] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the effect of ceramide on the cell cycle in human hepatocarcinoma Bel7402 cells. Possible molecular mechanisms were explored.
METHODS: [3- (4, 5)-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide (MTT) assay, plasmid transfection, reporter assay, FACS and Western blotting analyses were employed to investigate the effect and the related molecular mechanisms of C2-ceramide on the cell cycle of Bel7402 cells.
RESULTS: C2-ceramide was found to inhibit the growth of Bel7402 cells by inducing cell cycle arrest. During the process, the expression of p21 protein increased, while that of cyclinD1, phospho-ERK1/2 and c-myc decreased. Furthermore, the level of CDK7 was downregulated, while the transcriptional activity of PPARγ was upregulated. Addition of GW9662, which is a PPARγ specific antagonist, could reserve the modulation action on CDK7.
CONCLUSION: Our results support the hypothesis that cell cycle arrest induced by C2-ceramide may be mediated via accumulation of p21 and reduction of cyclinD1 and CDK7, at least partly, through PPARγ activation. The ERK signaling pathway was involved in this process.
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Affiliation(s)
- Jing Wang
- Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Haidian District, Beijing 100085, China.
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15
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Dorsey WC, Ford BD, Roane L, Haynie DT, Tchounwou PB. Induced mitogenic activity in AML-12 mouse hepatocytes exposed to low-dose ultra-wideband electromagnetic radiation. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2006; 2:24-30. [PMID: 16705798 PMCID: PMC3814693 DOI: 10.3390/ijerph2005010024] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Ultra–wideband (UWB) technology has increased with the use of various civilian and military applications. In the present study, we hypothesized that low-dose UWB electromagnetic radiation (UWBR) could elicit a mitogenic effect in AML-12 mouse hepatocytes, in vitro. To test this hypothesis, we exposed AML-12 mouse hepatocytes, to UWBR in a specially constructed gigahertz transverse electromagnetic mode (GTEM) cell. Cells were exposed to UWBR for 2 h at a temperature of 23°C, a pulse width of 10 ns, a repetition rate of 1 kHz, and field strength of 5–20 kV/m. UWB pulses were triggered by an external pulse generator for UWBR exposure but were not triggered for the sham exposure. We performed an MTT Assay to assess cell viability for UWBR-treated and sham-exposed hepatocytes. Data from viability studies indicated a time-related increase in hepatocytes at time intervals from 8–24 h post exposure. UWBR exerted a statistically significant (p < 0.05) dose-dependent response in cell viability in both serum-treated and serum free medium (SFM) -treated hepatocytes. Western blot analysis of hepatocyte lysates demonstrated that cyclin A protein was induced in hepatocytes, suggesting that increased MTT activity after UWBR exposure was due to cell proliferation. This study indicates that UWBR has a mitogenic effect on AML-12 mouse hepatocytes and implicates a possible role for UWBR in hepatocarcinoma.
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Affiliation(s)
- W. C. Dorsey
- Wildlife Biology Unit, Grambling State University, Grambling, LA. USA
| | - B. D. Ford
- Department of Anatomy and Neurobiology, Morehouse School of Medicine, Atlanta, GA. USA
| | - L. Roane
- Wildlife Biology Unit, Grambling State University, Grambling, LA. USA
| | - D. T. Haynie
- Biomedical Engineering & Physics, Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA. USA
| | - P. B. Tchounwou
- Molecular Toxicology Research Laboratory, NIH-Center for Environmental Health, College of Science, Engineering, and Technology, Jackson State University, Jackson, MS, USA
- Correspondence to Dr. Paul B. Tchounwou.
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16
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Qian K, Chen H, Wei Y, Hu J, Zhu G. Differentiation of endometrial stromal cells in vitro: down-regulation of suppression of the cell cycle inhibitor p57 by HOXA10? Mol Hum Reprod 2005; 11:245-51. [PMID: 15749785 DOI: 10.1093/molehr/gah147] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Decidualization is a critical step during embryo implantation that is characterized by the differentiation of endometrial stromal cells (ESC) into decidua cells. However, the mechanism of differentiation remains largely unknown. Previously, it has been shown that the null function of homeo box A10 (HOXA10) causes defects in both implantation and decidualization, suggesting that the HOXA10 signalling pathway is likely to be involved in uterine decidualization. In the present study, we determined the expression and subcellular distribution of HOXA10 and its downstream molecule, p57, in ESC during in vitro decidualization induced by a combination of 8-bromo-cAMP and medroxyprogesterone acetate. We demonstrated that the HOXA10 was down-regulated while in contrast, p57 was up-regulated in the process of decidualization. Immunocytochemistry and transient expression of the HOXA10 tagged with green fluorescence protein revealed that there were no differences in the HOXA10 subcellular localization between the induced and non-induced ESC. Our results suggest that the down-regulation of HOXA10 may contribute to increased p57 and that up-regulation of p57 likely plays an important role in ESC differentiation in the process of decidualization. The progesterone receptor pathway may participate in promoting ESC to exit the cell cycle and enter differentiation.
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Affiliation(s)
- Kun Qian
- Reproductive Medicine Center, Tongji Hospital, Tongji Medicine College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
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17
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Moro T, Ogasawara T, Chikuda H, Ikeda T, Ogata N, Maruyama Z, Komori T, Hoshi K, Chung UI, Nakamura K, Okayama H, Kawaguchi H. Inhibition of Cdk6 expression through p38 MAP kinase is involved in differentiation of mouse prechondrocyte ATDC5. J Cell Physiol 2005; 204:927-33. [PMID: 15795936 DOI: 10.1002/jcp.20350] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Because a temporal arrest in the G1-phase of the cell cycle is a prerequisite for cell differentiation, this study investigated the involvement of cell cycle factors in the differentiation of cultured mouse prechondrocyte cell line ATDC5. Among the G1 cell cycle factors examined, both protein and mRNA levels of cyclin-dependent kinase (Cdk6) were downregulated during the culture in a differentiation medium. The protein degradation of Cdk6 was not involved in this downregulation because proteasome inhibitors did not reverse the protein level. When inhibitors of p38 MAPK, ERK-1/2, and PI3K/Akt were added to the culture, only a p38 MAPK inhibitor SB203580 blocked the decrease in the Cdk6 protein level by the differentiation medium, indicating that the Cdk6 inhibition was mediated by p38 MAPK pathway. In fact, p38 MAPK was confirmed to be phosphorylated during differentiation of ATDC5 cells. Enforced expression of Cdk6 in ATDC5 cells blocked the chondrocyte differentiation and inhibited Sox5 and Sox6 expressions. However, the Cdk6 overexpression did not affect the proliferation or the cell cycle progression, suggesting that the inhibitory effect of Cdk6 on the differentiation was exerted by a mechanism largely independent of its cell cycle regulation. These results indicate that Cdk6 may be a regulator of chondrocyte differentiation and that its p38-mediated downregulation is involved in the efficient differentiation.
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Affiliation(s)
- Toru Moro
- Department of Sensory and Motor System Medicine, Faculty of Medicine, University of Tokyo, Japan
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18
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Gonzalez-Nicolini V, Fussenegger M. A novel binary adenovirus-based dual-regulated expression system for independent transcription control of two different transgenes. J Gene Med 2005; 7:1573-85. [PMID: 16052603 DOI: 10.1002/jgm.787] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND Stringent multitransgene control is a prerequisite for future gene-therapy and tissue-engineering scenarios and requires constant improvements in design to achieve optimal conditional transcription profiles. METHODS We have pioneered a variety of recombinant adenoviruses which (i) enable streptogramin-responsive transgene transduction in a compact autoregulated one-virus format, (ii) manage independent streptogramin- and tetracycline-responsive control of two different transgenes from a single divergent expression unit, and (iii) control sense and antisense expression of the human cyclin-dependent kinase inhibitor p27(Kip1) to engineer conditional positive (enforced S-phase entry, p27(Kip1)-antisense expression) or negative (G1-phase-specific growth arrest, p27(Kip1)-sense expression) growth control in mammalian cell lines and human primary cells. RESULTS The transgene control performance of all adenoviral expression configurations has been rigorously optimized for tight, balanced and maximum expression levels and was validated for intracellular as well as for secreted product in a variety of biotechnologically relevant cell lines (Chinese hamster ovary cells [CHO-K1], baby hamster kidney cells [BHK-21]) as well as in human cell lines (human fibrosarcoma cells [HT-1080]) and primary cells (human aortic fibroblasts [HAFs]). CONCLUSIONS We believe that multiregulated multigene-controlled adenoviruses are important assets for successful therapeutic reprogramming of mammalian cells in clinically relevant scenarios.
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Affiliation(s)
- Valeria Gonzalez-Nicolini
- Institute for Chemical and Bio-Engineering, Swiss Federal Institute of Technology, ETH Hoenggerberg, CH-8093 Zurich, Switzerland
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19
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Han S, Sidell N, Fisher PB, Roman J. Up-regulation of p21 gene expression by peroxisome proliferator-activated receptor gamma in human lung carcinoma cells. Clin Cancer Res 2004; 10:1911-9. [PMID: 15041706 DOI: 10.1158/1078-0432.ccr-03-0985] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE The peroxisome proliferator-activated receptor gamma (PPARgamma), a ligand-dependent transcription factor belonging to the family of nuclear receptors, has been implicated in the regulation of cell growth and differentiation although the exact mechanism(s) of this activity has not been elucidated. In this study, we explored the role of PPARgamma signaling on the control of gene expression of the cycle-dependent kinase inhibitor p21 in human lung carcinoma cells. EXPERIMENTAL DESIGN Using several human lung carcinoma cell lines (small and non-small carcinoma cells), we assayed for cell growth inhibition and apoptosis induction. We also assayed for p21 mRNA and protein expression by reverse transcription-PCR, real-time reverse transcription-PCR, and Western blot analysis. Nuclear protein binding activities to three response elements located in the p21 promoter [nuclear factor (NF)-kappaB, Sp1, and NF-interleukin 6 (IL6) CAAT/enhancer binding protein (C/EBP)] were measured by gel mobility shift assays. We used transient transfection assays with p21 promoter reporter gene constructs to determine the transcriptional regulation by PPARgamma ligands. Finally, by using p21 antisense oligonucleotides, we tested the link between PPARgamma activation and p21 signaling in cell growth inhibition assays and by Western blot analysis. RESULTS We showed that the PPARgamma ligands PGJ2 and ciglitazone inhibit the growth and induce the apoptosis of several human lung carcinoma cell lines, whereas the PPARalpha agonist WY14643 has little effect. Treatment of lung carcinoma cells with the PPARgamma ligands PGJ2, ciglitazone, troglizaone, and GW1929 elevated p21 mRNA and protein levels and reduced cyclin D1 mRNA levels. These results were supported by transient transfection assays, which indicated that PPARgamma ligands increased p21 gene promoter activity in human lung carcinoma cells. In addition, p21 antisense oligonucleotides inhibited PPARgamma ligand-induced p21 protein expression and significantly blocked lung carcinoma cell growth inhibition induced by PPARgamma ligands. Finally, electrophoresis mobility shift experiments demonstrated that PPARgamma ligands increased the nuclear binding activities of Sp1 and NF-IL6 (C/EBP), two transcription factors with regulatory elements in the promoter region of the p21 gene. CONCLUSION PPARgamma ligands inhibit human lung carcinoma cell growth and induce apoptosis by stimulating the cyclin-dependent kinase inhibitor p21 and by reducing cyclin D1 gene expression. The induction of p21 gene expression by PPARgamma ligands may be mediated through increased Sp1- and NF-IL6 (C/EBP)-dependent transcriptional activation. These observations unveil a mechanism for p21 gene regulation in lung carcinoma that represents a potential target for therapy.
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Affiliation(s)
- Shouwei Han
- Department of Medicine, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
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20
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Zhu XH, Nguyen H, Halicka HD, Traganos F, Koff A. Noncatalytic requirement for cyclin A-cdk2 in p27 turnover. Mol Cell Biol 2004; 24:6058-66. [PMID: 15199159 PMCID: PMC480915 DOI: 10.1128/mcb.24.13.6058-6066.2004] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Ubiquitin-dependent proteolysis makes a major contribution to decreasing the levels of p27. Ubiquitin-dependent proteolysis of p27(kip1) is growth and cell cycle regulated in two ways: first, skp2, a component of the E3-ubiquitin ligase, is growth regulated, and second, a kinase must phosphorylate the threonine-187 position on p27 so that it can be recognized by skp2. In vitro, p27 is phosphorylated by cyclin E- and cyclin A-associated cdk2 as well as by cyclin B1-cdk1. Having analyzed the effect of different cyclin-cyclin-dependent kinase complexes on ubiquitination of p27 in a reconstitution assay system, we now report a noncatalytic requirement for cyclin A-cdk2. Multiparameter flow cytometric analysis also indicates that p27 turnover correlates best with the onset of S phase, once the levels of cyclin A become nearly maximal. Finally, increasing the amount of both cyclin E-cdk2 and skp2 was less efficient at promoting p27 ubiquitination than was increasing the amount of cyclin A-cdk2 alone in extracts prepared from cultures of >93%-purified G(1) cells. Together these lines of evidence suggest that cyclin A-cdk2 plays an ancillary noncatalytic role in the ubiquitination of p27 by the SCF(skp2) complex.
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Affiliation(s)
- Xin-Hua Zhu
- Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA
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21
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Liu ZM, Chen GG, Ng EKW, Leung WK, Sung JJY, Chung SCS. Upregulation of heme oxygenase-1 and p21 confers resistance to apoptosis in human gastric cancer cells. Oncogene 2004; 23:503-13. [PMID: 14647439 DOI: 10.1038/sj.onc.1207173] [Citation(s) in RCA: 133] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Both heme oxygenase-1 (HO-1) and p21(WAF1/Cip1) (p21) are involved in the pathogenesis of human cancer and their functions are closely associated with apoptosis. However, how these two molecules regulate apoptosis in human gastric cancer is unknown. In this study, we studied how HO-1 and p21 were regulated in two gastric cancer cell lines, MKN-45 with wild p53 and MKN-28 with mutant p53. The cells were treated with hemin and cadmium to induce HO-1. The result showed that HO-1 protein was significantly induced by hemin and cadmium in both cells tested. Following the HO-1 expression, p21 level was also markedly induced. The cells with increased HO-1 and p21 showed obviously resistantance to apoptotic stimuli. The levels of HO-1 and p21 induced were significantly inhibited by p38 mitogen-activated protein kinase (p38 MAPK) inhibitor (SB203580) and extracellular-regulated kinase (ERK) inhibitor (PD098059). Parallel to decreased HO-1 and p21 expression, the kinase inhibitors also significantly attenuated the resistance of the cells to apoptosis. The elevated HO-1 and p21 was further found to be associated with increase activity of the nuclear NF-kappaB and the inhibition of NF-kappaB led to the block of their induction. The elevated HO-1 and p21 were also demonstrated to be related to increased cellular inhibitor of caspase inbitory protein-2 (c-IAP2) and decreased caspapse-3 activity. It was noted that the above changes observed were not different between MKN-45 and MKN-28 cells, suggesting the functions of HO-1 and p21 were irrespective of the status of p53. In conclusion, we demonstrate that the resistance to apoptosis in gastric cancer cells with elevated HO-1 and p21 is independent of p53 status in a p38 MAPK- and ERK-mediated pathway with elevated c-IAP2 and decreased caspase-3 activity and that this pathway is sensitive to the inhibition of NF-kappaB.
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Affiliation(s)
- Zhi-Min Liu
- Department of Surgery, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong
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22
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Joseph B, Wallén-Mackenzie A, Benoit G, Murata T, Joodmardi E, Okret S, Perlmann T. p57(Kip2) cooperates with Nurr1 in developing dopamine cells. Proc Natl Acad Sci U S A 2003; 100:15619-24. [PMID: 14671317 PMCID: PMC307617 DOI: 10.1073/pnas.2635658100] [Citation(s) in RCA: 111] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Cyclin-dependent kinase inhibitors of the Cip/Kip family play critical roles in regulating cell proliferation during embryogenesis. However, these proteins also influence cell differentiation by mechanisms that have remained unknown. Here we show that p57Kip2 is expressed in postmitotic differentiating midbrain dopamine cells. Induction of p57Kip2 expression depends on Nurr1, an orphan nuclear receptor that is essential for dopamine neuron development. Moreover, analyses of p57Kip2 gene-targeted mice revealed that p57Kip2 is required for the maturation of midbrain dopamine neuronal cells. Additional experiments in a dopaminergic cell line demonstrated that p57Kip2 can promote maturation by a mechanism that does not require p57Kip2-mediated inhibition of cyclin-dependent kinases. Instead, evidence indicates that p57Kip2 functions by a direct protein-protein interaction with Nurr1. Thus, in addition to its established function in control of proliferation, these results reveal a mechanism whereby p57Kip2 influences postmitotic differentiation of dopamine neurons.
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Affiliation(s)
- Bertrand Joseph
- The Ludwig Institute for Cancer Research, Box 240, S-171 77 Stockholm, Sweden
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23
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Braun-Dullaeus RC, Ziegler A, Bohle RM, Bauer E, Hein S, Tillmanns H, Haberbosch W. Quantification of the cell-cycle inhibitors p27(Kip1) and p21(Cip1) in human atherectomy specimens: primary stenosis versus restenosis. THE JOURNAL OF LABORATORY AND CLINICAL MEDICINE 2003; 141:179-89. [PMID: 12624599 DOI: 10.1067/mlc.2003.23] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Proliferation, a key determinator of vascular proliferative diseases, is dependent on cyclin/cyclin-dependent kinase (CDK) complexes, which are controlled by cyclin-dependent kinase inhibitors (CKIs) such as p27(Kip1) and p21(Cip1). Both have prognostic significance in various human malignancies. We have determined the levels of p27(Kip1) and p21(Cip1) in human directional coronary atherectomy specimens of primary lesions (n = 15) and lesions of in-stent restenosis (n = 18) in comparison to those of other vascular regions and have correlated CKI levels with clinical data. Quantitative immunoblotting demonstrated low expression of p27(Kip1) in primary lesions (5.9 +/- 0.5 ng/mg protein) compared with that in aorta (14.9 +/- 0.9 ng/mg), internal mammary artery (16.7 +/- 1.1 ng/mg), and carotid artery thrombendarterectomy specimens (16.5 +/- 1.7 ng/mg). Similarly, p27(Kip1) levels in lesions of in-stent restenosis were found to be significantly reduced (6.3 +/- 1.1 ng/mg; mean time of restenosis development 367 +/- 61 days). p27(Kip1) levels did, however, not have prognostic significance for the development of restenosis, and expression levels of proliferating cell nuclear antigen and CDK2 were similar in all groups examined, indicating low proliferative activity. Clinically, p27(Kip1) was not of value in predicting the development of restenosis. Furthermore, p27(Kip1) tissue levels were not increased in statin-treated patients, implying that the favorable effect of these drugs is not a result of p27(Kip1) stabilization. However, the relative content of p21(Cip1) was found to be significantly up-regulated in restenosis compared with that in primary lesions (225%) and the other vascular regions. Our data imply that negative-feedback mechanisms are still intact in coronary proliferative disease, thereby contrasting the finding of deregulated proliferation in malignancies.
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Affiliation(s)
- Ruediger C Braun-Dullaeus
- Department of Internal Medicine, Giessen University, the Kerckhoff Klinik, Bad Nauheim, and Zentralklinikum Suhl, Germany.
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24
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Frippiat C, Remacle J, Toussaint O. Down-regulation and decreased activity of cyclin-dependent kinase 2 in H2O2-induced premature senescence. Int J Biochem Cell Biol 2003; 35:246-54. [PMID: 12479875 DOI: 10.1016/s1357-2725(02)00129-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Premature senescence of human diploid fibroblasts (HDFs) induced by exposure to H2O2 at subcytotoxic concentration is characterized by many biomarkers of normal senescence such as irreversible growth arrest. Cyclin-dependent kinase inhibitor (CdKI) p21(Waf-1) is overexpressed in H2O2- and tert-butylhydroperoxide-induced premature senescence, likely explaining in part the hypophosphorylation of the retinoblastoma protein. p21(Waf-1) is known to inhibit the kinase activity of the cyclin-dependent kinase (CdK) 4 and 6 cyclin complexes. In this work, we investigated whether the kinase activity of the CdK4 and 6 cyclin complexes can be modulated by CdKI p16(Ink-4a), by changes in the protein level of CdKs and cyclins, or by changes in kinase activity of these CdKs not directly involving CdKIs. RNase protection assay, semi-quantitative RT-PCR, Western blot and kinase assay showed that the mRNA level, protein and kinase activity of CdK2 are decreased at 72h after H2O2 stress. These results suggest that the hypophosphorylation of the retinoblastoma protein is mediated in part by a decrease of the kinase activity of CdK2 not directly involving CdKIs. This CdK2-mediated effect should be considered in addition to the inhibition of cyclin D-CdK4 and 6 complexes by CdKI p21(Waf-1).
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Affiliation(s)
- Christophe Frippiat
- Research Unit on Cellular Biology, University of Namur (FUNDP), 61 Rue de Bruxelles, B-5000, Namur, Belgium
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25
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A Recombinant Adenovirus Expressing P27(KIP1) Induces Cell Cycle Arrest and Apoptosis In Human 786???0 Renal Carcinoma Cells. J Urol 2002. [DOI: 10.1097/00005392-200208000-00096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Pennington KN, Taylor JA, Bren GD, Paya CV. IkappaB kinase-dependent chronic activation of NF-kappaB is necessary for p21(WAF1/Cip1) inhibition of differentiation-induced apoptosis of monocytes. Mol Cell Biol 2001; 21:1930-41. [PMID: 11238929 PMCID: PMC86780 DOI: 10.1128/mcb.21.6.1930-1941.2001] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2000] [Accepted: 12/11/2000] [Indexed: 11/20/2022] Open
Abstract
The molecular mechanisms regulating monocyte differentiation to macrophages remain unknown. Although the transcription factor NF-kappaB participates in multiple cell functions, its role in cell differentiation is ill defined. Since differentiated macrophages, in contrast to cycling monocytes, contain significant levels of NF-kappaB in the nuclei, we questioned whether this transcription factor is involved in macrophage differentiation. Phorbol 12-myristate 13-acetate (PMA)-induced differentiation of the promonocytic cell line U937 leads to persistent NF-kappaB nuclear translocation. We demonstrate here that an increased and persistent IKK activity correlates with monocyte differentiation leading to persistent NF-kappaB activation secondary to increased IkappaBalpha degradation via the IkappaB signal response domain (SRD). Promonocytic cells stably overexpressing an IkappaBalpha transgene containing SRD mutations fail to activate NF-kappaB and subsequently fail to survive the PMA-induced macrophage differentiation program. The differentiation-induced apoptosis was found to be dependent on tumor necrosis factor alpha. The protective effect of NF-kappaB is mediated through p21(WAF1/Cip1), since this protein was found to be regulated in an NF-kappaB-dependent manner and to confer survival features during macrophage differentiation. Therefore, NF-kappaB plays a key role in cell differentiation by conferring cell survival that in the case of macrophages is mediated through p21(WAF1/Cip1).
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Affiliation(s)
- K N Pennington
- Department of Immunology, Mayo Clinic, Rochester, Minnesota 55905, USA
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27
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Okahashi N, Murase Y, Koseki T, Sato T, Yamato K, Nishihara T. Osteoclast differentiation is associated with transient upregulation of cyclin‐dependent kinase inhibitors p21
WAF1/CIP1
and p27
KIP1. J Cell Biochem 2000. [DOI: 10.1002/1097-4644(20010301)80:3<339::aid-jcb60>3.0.co;2-#] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nobuo Okahashi
- Department of Oral Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Yoshiyuki Murase
- Department of Oral Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Takeyoshi Koseki
- Department of Oral Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Tsuyoshi Sato
- Department of Oral Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Kenji Yamato
- Department of Molecular Cellular Oncology/Microbiology, Faculty of Dentistry, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tatsuji Nishihara
- Department of Oral Microbiology, Kyushu Dental College, Kita‐Kyushu, Japan
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28
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Frey MR, Clark JA, Leontieva O, Uronis JM, Black AR, Black JD. Protein kinase C signaling mediates a program of cell cycle withdrawal in the intestinal epithelium. J Cell Biol 2000; 151:763-78. [PMID: 11076962 PMCID: PMC2169440 DOI: 10.1083/jcb.151.4.763] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Members of the protein kinase C (PKC) family of signal transduction molecules have been widely implicated in regulation of cell growth and differentiation, although the underlying molecular mechanisms involved remain poorly defined. Using combined in vitro and in vivo intestinal epithelial model systems, we demonstrate that PKC signaling can trigger a coordinated program of molecular events leading to cell cycle withdrawal into G(0). PKC activation in the IEC-18 intestinal crypt cell line resulted in rapid downregulation of D-type cyclins and differential induction of p21(waf1/cip1) and p27(kip1), thus targeting all of the major G(1)/S cyclin-dependent kinase complexes. These events were associated with coordinated alterations in expression and phosphorylation of the pocket proteins p107, pRb, and p130 that drive cells to exit the cell cycle into G(0) as indicated by concomitant downregulation of the DNA licensing factor cdc6. Manipulation of PKC isozyme levels in IEC-18 cells demonstrated that PKCalpha alone can trigger hallmark events of cell cycle withdrawal in intestinal epithelial cells. Notably, analysis of the developmental control of cell cycle regulatory molecules along the crypt-villus axis revealed that PKCalpha activation is appropriately positioned within intestinal crypts to trigger this program of cell cycle exit-specific events in situ. Together, these data point to PKCalpha as a key regulator of cell cycle withdrawal in the intestinal epithelium.
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Affiliation(s)
- M R Frey
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Buffalo, New York 14263, USA.
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29
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Park JS, Qiao L, Gilfor D, Yang MY, Hylemon PB, Benz C, Darlington G, Firestone G, Fisher PB, Dent P. A role for both Ets and C/EBP transcription factors and mRNA stabilization in the MAPK-dependent increase in p21 (Cip-1/WAF1/mda6) protein levels in primary hepatocytes. Mol Biol Cell 2000; 11:2915-32. [PMID: 10982390 PMCID: PMC14965 DOI: 10.1091/mbc.11.9.2915] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
In primary hepatocytes and HepG2 hepatoma cells, prolonged activation of the p42/44 mitogen-activated protein kinase (MAPK) pathway is associated with a reduction in DNA synthesis, mediated by increased expression of the cyclin-dependent kinase inhibitor protein p21 (Cip-1/WAF1/mda6) (p21). This study was performed to evaluate the contribution of transcriptional and post-transcriptional regulation in this response. Prolonged activation of the MAPK pathway in wild-type or p21 null hepatocytes caused a large decrease and increase, respectively, in DNA synthesis. Prolonged activation of the MAPK pathway in either wild-type or p21 antisense HepG2 cells also caused large decreases and increases, respectively, in DNA synthesis. MAPK signaling increased the phosphorylation of the transcription factors Ets2, C/EBPalpha, and C/EBPbeta, and rapidly increased transcription from the p21 promoter via multiple Ets- and C/EBP-elements within the enhancer region. Eight hours after MAPK activation, loss of C/EBPbeta or Ets2 function significantly reduced MAPK-stimulated transcription from the p21 promoter and abolished increased p21 protein expression. At this time, MAPK signaling increased both p21 mRNA and p21 protein stabilities that were also demonstrated to be essential for a profound increase in p21 protein levels. Thirty-six hours after MAPK activation, transcription from the p21 promoter was still significantly reduced in cells without either C/EBPbeta or Ets2 function; however, these cells were now capable of exhibiting a partial increase in p21 protein expression. In contrast, loss of C/EBPalpha function modestly reduced MAPK-stimulated transcription from the p21 promoter but strongly inhibited the ability of prolonged MAPK activation to increase protein levels of p21. This data suggested that prolonged enhancement of p21 protein levels may be under posttranscriptional control. In agreement with this hypothesis, prolonged MAPK signaling further increased p21 mRNA stability at 36 h, compared with the 8-h time point. Our data argue that MAPK signaling increased p21 promoter activity via multiple transcription factors, which alone were insufficient for a robust prolonged increase in p21 protein levels in primary hepatocytes, and that to increase p21 protein levels also required enhanced stabilization of p21 mRNA and p21 protein. Collectively, these data suggest that loss of transcription factor and mRNA/protein stabilization functions correlates with an inability of MAPK signaling to cause growth arrest versus proliferation in primary hepatocytes.
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Affiliation(s)
- J S Park
- Departments of Radiation Oncology, Medical College of Virginia, Virginia Commonwealth University, Richmond, Virginia 23298, USA
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30
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31
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Park JS, Carter S, Reardon DB, Schmidt-Ullrich R, Dent P, Fisher PB. Roles for basal and stimulated p21(Cip-1/WAF1/MDA6) expression and mitogen-activated protein kinase signaling in radiation-induced cell cycle checkpoint control in carcinoma cells. Mol Biol Cell 1999; 10:4231-46. [PMID: 10588655 PMCID: PMC25755 DOI: 10.1091/mbc.10.12.4231] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
We investigated the role of the cdk inhibitor protein p21(Cip-1/WAF1/MDA6) (p21) in the ability of MAPK pathway inhibition to enhance radiation-induced apoptosis in A431 squamous carcinoma cells. In carcinoma cells, ionizing radiation (2 Gy) caused both primary (0-10 min) and secondary (90-240 min) activations of the MAPK pathway. Radiation induced p21 protein expression in A431 cells within 6 h via secondary activation of the MAPK pathway. Within 6 h, radiation weakly enhanced the proportion of cells in G(1) that were p21 and MAPK dependent, whereas the elevation of cells present in G(2)/M at this time was independent of either p21 expression or MAPK inhibition. Inhibition of the MAPK pathway increased the proportion of irradiated cells in G(2)/M phase 24-48 h after irradiation and enhanced radiation-induced apoptosis. This correlated with elevated Cdc2 tyrosine 15 phosphorylation, decreased Cdc2 activity, and decreased Cdc25C protein levels. Caffeine treatment or removal of MEK1/2 inhibitors from cells 6 h after irradiation reduced the proportion of cells present in G(2)/M phase at 24 h and abolished the ability of MAPK inhibition to potentiate radiation-induced apoptosis. These data argue that MAPK signaling plays an important role in the progression/release of cells through G(2)/M phase after radiation exposure and that an impairment of this progression/release enhances radiation-induced apoptosis. Surprisingly, the ability of irradiation/MAPK inhibition to increase the proportion of cells in G(2)/M at 24 h was found to be dependent on basal p21 expression. Transient inhibition of basal p21 expression increased the control level of apoptosis as well as the abilities of both radiation and MEK1/2 inhibitors to cause apoptosis. In addition, loss of basal p21 expression significantly reduced the capacity of MAPK inhibition to potentiate radiation-induced apoptosis. Collectively, our data argue that MAPK signaling and p21 can regulate cell cycle checkpoint control in carcinoma cells at the G(1)/S transition shortly after exposure to radiation. In contrast, inhibition of MAPK increases the proportion of irradiated cells in G(2)/M, and basal expression of p21 is required to maintain this effect. Our data suggest that basal and radiation-stimulated p21 may play different roles in regulating cell cycle progression that affect cell survival after radiation exposure.
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Affiliation(s)
- J S Park
- Department of Radiation Oncology, Medical College of Virginia, Virginia Commonwealth University, Richmond, Virginia 23298, USA
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32
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Abstract
Notch-ligand interactions are a highly conserved mechanism that regulates cell fate decisions. Over the past few years, numerous observations have shown that this mechanism operates to regulate cell differentiation in an enormous variety of developmental and cell maturation processes. Recent studies indicate that in addition to cell differentiation, Notch signaling has direct effects on proliferation and programmed cell death. The picture emerging from these findings suggests that, depending on cellular and developmental context, Notch signaling may function as a general "arbiter" of cell fate, regulating differentiation potential, rate of proliferation, and apoptotic cell death. In this review, we briefly summarize the current knowledge of the structure and function of Notch receptors and discuss the recent evidence that Notch signaling regulates apoptotic cell death. The possible mechanisms of this effect and its potential implications for developmental biology, immunobiology, neuropathology, and tumor biology are discussed.
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Affiliation(s)
- L Miele
- Cardinal Bernardin Cancer Center, Loyola University Medical Center, Maywood, Illinois 60153, USA.
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33
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Braun-Dullaeus RC, Mann MJ, Ziegler A, von der Leyen HE, Dzau VJ. A novel role for the cyclin-dependent kinase inhibitor p27(Kip1) in angiotensin II-stimulated vascular smooth muscle cell hypertrophy. J Clin Invest 1999; 104:815-23. [PMID: 10491417 PMCID: PMC408428 DOI: 10.1172/jci5339] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/1998] [Accepted: 08/04/1999] [Indexed: 12/26/2022] Open
Abstract
Angiotensin II (Ang II) has been shown to stimulate either hypertrophy or hyperplasia. We postulated that the differential response of vascular smooth muscle cells (VSMCs) to Ang II is mediated by the cyclin-dependent kinase (Cdk) inhibitor p27(Kip1), which is abundant in quiescent cells and drops after serum stimulation. Ang II treatment (100 nM) of quiescent VSMCs led to upregulation of the cell-cycle regulatory proteins cyclin D1, Cdk2, proliferating cell nuclear antigen, and Cdk1. p27(Kip1) levels, however, remained high, and the activation of the G1-phase Cdk2 was inhibited as the cells underwent hypertrophy. Overexpression of p27(Kip1) cDNA inhibited serum-stimulated [(3)H]thymidine incorporation compared with control-transfected cells. This cell-cycle inhibition was associated with cellular hypertrophy, as reflected by an increase in the [(3)H]leucine/[(3)H]thymidine incorporation ratio and by an increase in forward-angle light scatter during flow cytometry at 48 hours after transfection. The role of p27(Kip1) in modulating the hypertrophic response of VSMCs to Ang II was further tested by antisense oligodeoxynucleotide (ODN) inhibition of p27(Kip1) expression. Ang II stimulated an increase in [(3)H]thymidine incorporation and the percentage of S-phase cells in antisense ODN-transfected cells but not in control ODN-transfected cells. We conclude that p27(Kip1) plays a role in mediating VSMC hypertrophy. Ang II stimulation of quiescent cells in which p27(Kip1) levels are high results in hypertrophy but promotes hyperplasia when levels of p27(Kip1) are low, as in the presence of other growth factors.
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34
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Legraverend M, Ludwig O, Bisagni E, Leclerc S, Meijer L, Giocanti N, Sadri R, Favaudon V. Synthesis and in vitro evaluation of novel 2,6,9-trisubstituted purines acting as cyclin-dependent kinase inhibitors. Bioorg Med Chem 1999; 7:1281-93. [PMID: 10465404 DOI: 10.1016/s0968-0896(99)00064-4] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Novel C-2, C-6, N-9 trisubstituted purines derived from the olomoucine/roscovitine lead structure were synthesized and evaluated for their ability to inhibit starfish oocyte CDK1/cyclin B, neuronal CDK5/p35 and erk1 kinases in purified extracts. Structure activity relationship studies showed that increased steric bulk at N-9 reduces the inhibitory potential whereas substitution of the aminoethanol C-2 side chain by various groups of different size (methyl, propyl, butyl, phenyl, benzyl) only slightly decreases the activity when compared to (R)-roscovitine. Optimal inhibitory activity against CDK5, CDK1 and CDK2, with IC50 values of 0.16, 0.45 and 0.65 microM, respectively, was obtained with compound 21 containing a (2R)-pyrrolidin-2-yl-methanol substituent at the C-2 and a 3-iodobenzylamino group at the C-6 of the purine. Compound 21 proved cytotoxic against human tumor HeLa cells (LD50-6.7 microM versus 42.7 microM for olomoucine, 24-h contact). Furthermore, unlike olomoucine, compound 21 was effective upon short exposure (LD50= 25.3 microM, 2-h contact). The available data suggest that the affinity for CDKs and the cytotoxic potential of the drugs are inter-related. However, no straightforward cell cycle phase specificity of the cytotoxic response to 21 was observed in synchronized HeLa cells. With the noticeable exception of pronounced lengthening of the S-phase transit by 21 applied during early-S in synchronized HeLa cells, and in striking contrast with earlier reports on studies using plant or echinoderm cells. olomoucilnc and compound 21 were unable to reversibly arrest cell cycle progression in asynchronous growing HeLa cells. Some irreversible hlock in GI and G2 phase occurred at high olomoucine concentration, correlated with induced cell death. Moreover, chmronic exposure to lethal doses of compound 21 resulted in massive nuclear fragmentation, evocative of mitotic catastrophe with minour amounts of apoptosis only. It was also found that olomoucine and compound 21 reversibly block the intracellular uptake of nuicleosides with high efficiency.
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Affiliation(s)
- M Legraverend
- UMR 176 CNRS-IC, Institut Curie-Recherche, Centre Universitaire, Orsay, France
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35
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Ellis M, Chew YP, Fallis L, Freddersdorf S, Boshoff C, Weiss RA, Lu X, Mittnacht S. Degradation of p27(Kip) cdk inhibitor triggered by Kaposi's sarcoma virus cyclin-cdk6 complex. EMBO J 1999; 18:644-53. [PMID: 9927424 PMCID: PMC1171157 DOI: 10.1093/emboj/18.3.644] [Citation(s) in RCA: 144] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The Kaposi's sarcoma-associated human herpesvirus 8 (KSHV/HHV8) encodes a protein similar to cellular cyclins. This cyclin is most closely related to cellular D-type cyclins, but biochemically it behaves atypically in various respects. Complexes formed between the viral cyclin and the cyclin-dependent kinase subunit, cdk6, can phosphorylate a wider range of substrates and are resistant to cdk inhibitory proteins. We show here that the KSHV-cyclin-cdk6 complex phosphorylates p27(Kip) on a C-terminal threonine that is implicated in destabilization of this cdk inhibitor. Expression of the viral cyclin in tissue culture cells overcomes a cell cycle block by p27(Kip). However, full cell-cycle transit of these cells appears to depend on C-terminal phosphorylation of p27(Kip) and seems to involve transactivation of other cellular cyclin-dependent kinases. A p27(Kip)-phosphorylating cdk6 complex exists in cell lines derived from primary effusion lymphoma and in Kaposi's sarcoma, this indicating that virally induced p27(Kip) degradation may occur in KSHV-associated tumours.
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Affiliation(s)
- M Ellis
- Institute of Cancer Research, Chester Beatty Laboratory, London, UK
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36
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Auer KL, Park JS, Seth P, Coffey RJ, Darlington G, Abo A, McMahon M, Depinho RA, Fisher PB, Dent P. Prolonged activation of the mitogen-activated protein kinase pathway promotes DNA synthesis in primary hepatocytes from p21Cip-1/WAF1-null mice, but not in hepatocytes from p16INK4a-null mice. Biochem J 1998; 336 ( Pt 3):551-60. [PMID: 9841865 PMCID: PMC1219904 DOI: 10.1042/bj3360551] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In primary rat hepatocytes, prolonged activation of the p42/44 mitogen-activated protein kinase (MAPK) pathway is associated with a decrease in DNA synthesis and increased expression of the cyclin-dependent kinase inhibitor (CKI) proteins p21Cip-1/WAF1 and p16INK4a. To evaluate the relative importance of these CKIs in mediating this response, we determined the impact of prolonged MAPK activation on DNA synthesis in primary cultures of hepatocytes derived from mice embryonically deleted (null) for either p21Cip-1/WAF1 or p16INK4a. When MAPK was activated in wild-type mouse hepatocytes for 24 h, via infection with a construct to express an inducible oestrogen receptor-Raf-1 fusion protein (DeltaRaf:ER), the expression of p21Cip-1/WAF1 and p16INK4a CKI proteins increased, cyclin-dependent kinase 2 (cdk2) and cdk4 activities decreased, and DNA synthesis decreased. Inhibition of RhoA GTPase function increased the basal expression of p21Cip-1/WAF1 and p27Kip-1 but not p16INK4a, and enhanced the ability of MAPK signalling to decrease DNA synthesis. Ablation of the expression of CCAATT enhancer-binding protein alpha (C/EBPalpha), but not of the expression of C/EBPbeta, decreased the ability of MAPK signalling to induce p21Cip-1/WAF1. When MAPK was activated in p16INK4a-null hepatocytes for 24 h, the expression of p21Cip-1/WAF1 increased, cdk2 and cdk4 activities decreased and DNA synthesis decreased. In contrast with these findings, prolonged activation of the MAPK pathway in hepatocytes from p21Cip-1/WAF1-null mice enhanced cdk2 and cdk4 activities and caused a large increase in DNA synthesis, despite elevated expression of p16INK4a. Inhibition of RhoA GTPase activity in p21Cip-1/WAF1-null cells partly blunted both the basal levels of DNA synthesis and the ability of prolonged MAPK signalling to increase DNA synthesis. Expression of anti-sense p21Cip-1/WAF1 in either wild-type or p16INK4a-null hepatocytes decreased the ability of prolonged MAPK signalling to increase the expression of p21Cip-1/WAF1, and permitted MAPK signalling to increase both cdk2 and cdk4 activities and DNA synthesis. These results argue that the ability of prolonged MAPK signalling to inhibit DNA synthesis in hepatocytes requires the expression of p21Cip-1/WAF1, and that the increased expression of p16INK4a has a smaller role in the ability of this stimulus to mediate growth arrest. Our results also suggest that RhoA function can modulate DNA synthesis in primary hepatocytes via the expression of p21Cip-1/WAF1 and p27Kip-1.
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Affiliation(s)
- K L Auer
- Department of Radiation Oncology, Medical College of Virginia, Virginia Commonwealth University, Richmond, VA 23298, USA
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37
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Affiliation(s)
- C E Gillett
- Hedley Atkins/ICRF Breast Pathology Laboratory, Guy's Hospital, London, UK.
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38
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Su ZZ, Madireddi MT, Lin JJ, Young CS, Kitada S, Reed JC, Goldstein NI, Fisher PB. The cancer growth suppressor gene mda-7 selectively induces apoptosis in human breast cancer cells and inhibits tumor growth in nude mice. Proc Natl Acad Sci U S A 1998; 95:14400-5. [PMID: 9826712 PMCID: PMC24385 DOI: 10.1073/pnas.95.24.14400] [Citation(s) in RCA: 207] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
A differentiation induction subtraction hybridization strategy is being used to identify and clone genes involved in growth control and terminal differentiation in human cancer cells. This scheme identified melanoma differentiation associated gene-7 (mda-7), whose expression is up-regulated as a consequence of terminal differentiation in human melanoma cells. Forced expression of mda-7 is growth inhibitory toward diverse human tumor cells. The present studies elucidate the mechanism by which mda-7 selectively suppresses the growth of human breast cancer cells and the consequence of ectopic expression of mda-7 on human breast tumor formation in vivo in nude mice. Infection of wild-type, mutant, and null p53 human breast cancer cells with a recombinant type 5 adenovirus expressing mda-7, Ad.mda-7 S, inhibited growth and induced programmed cell death (apoptosis). Induction of apoptosis correlated with an increase in BAX protein, an established inducer of programmed cell death, and an increase in the ratio of BAX to BCL-2, an established inhibitor of apoptosis. Infection of breast carcinoma cells with Ad.mda-7 S before injection into nude mice inhibited tumor development. In contrast, ectopic expression of mda-7 did not significantly alter cell cycle kinetics, growth rate, or survival in normal human mammary epithelial cells. These data suggest that mda-7 induces its selective anticancer properties in human breast carcinoma cells by promoting apoptosis that occurs independent of p53 status. On the basis of its selective anticancer inhibitory activity and its direct antitumor effects, mda-7 may represent a new class of cancer suppressor genes that could prove useful for the targeted therapy of human cancer.
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Affiliation(s)
- Z Z Su
- Department of Urology, Herbert Irving Comprehensive Cancer Center, Columbia University, College of Physicians and Surgeons, New York, NY 10032, USA
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