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Wang X, Li S. Protein mislocalization: mechanisms, functions and clinical applications in cancer. BIOCHIMICA ET BIOPHYSICA ACTA 2014; 1846:13-25. [PMID: 24709009 PMCID: PMC4141035 DOI: 10.1016/j.bbcan.2014.03.006] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 02/20/2014] [Accepted: 03/27/2014] [Indexed: 12/21/2022]
Abstract
The changes from normal cells to cancer cells are primarily regulated by genome instability, which foster hallmark functions of cancer through multiple mechanisms including protein mislocalization. Mislocalization of these proteins, including oncoproteins, tumor suppressors, and other cancer-related proteins, can interfere with normal cellular function and cooperatively drive tumor development and metastasis. This review describes the cancer-related effects of protein subcellular mislocalization, the related mislocalization mechanisms, and the potential application of this knowledge to cancer diagnosis, prognosis, and therapy.
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Affiliation(s)
- Xiaohong Wang
- Department of Pediatrics, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA
| | - Shulin Li
- Department of Pediatrics, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA.
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202
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Hassel JC, Groesser L, Herschberger E, Weichert W, Hafner C. RAS mutations in benign epithelial tumors associated with BRAF inhibitor treatment of melanoma. J Invest Dermatol 2014; 135:636-639. [PMID: 25118623 DOI: 10.1038/jid.2014.360] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jessica C Hassel
- Department of Dermatology and National Center for Tumor Diseases, University Hospital Heidelberg, Heidelberg, Germany.
| | - Leopold Groesser
- Department of Dermatology, University Hospital Regensburg, Regensburg, Germany
| | - Eva Herschberger
- Department of Dermatology, University Hospital Regensburg, Regensburg, Germany
| | - Wilko Weichert
- Institute for Pathology, University Hospital Heidelberg, Heidelberg, Germany
| | - Christian Hafner
- Department of Dermatology, University Hospital Regensburg, Regensburg, Germany
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203
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Gender effect in experimental models of human medulloblastoma: does the estrogen receptor β signaling play a role? PLoS One 2014; 9:e101623. [PMID: 25000562 PMCID: PMC4084991 DOI: 10.1371/journal.pone.0101623] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 05/24/2014] [Indexed: 01/28/2023] Open
Abstract
Background The male-to-female sex ratio for medulloblastoma (MB) is approximately 1.5∶1, female gender being also a favorable prognostic factor. This study aimed at evaluating the impact of gender on MB tumorigenesis. Methods In vitro activity of 17β-estradiol (E2), DPN [2,3-bis(4-hydroxyphenyl)-propionitrile, a selective estrogen receptor β (ERβ)-agonist], PPT [4,4′,4″-(4-Propyl-[1H]-pyrazole-1,3,5-triyl) trisphenol, a selective ERα-agonist] or DHT (5 alpha-dihydrotestosterone) was evaluated in three human MB cell lines. D283 Med cells were transplanted into athymic mice. Results A significant expression of ERβ, with little or no ERα, and low AR (androgen receptor) was found in MB cell lines. The compounds tested did not affect cell proliferation. In vivo, we observed a significantly lower growth of D283 Med in nude female mice compared to males. At microscopic examination, tumors from females showed a shift towards differentiation, as evaluated by lower nestin, and higher NSE (neuron-specific enolase) and GFAP (glial fibrillary acidic protein) expression compared to males. Tumors from females also showed lower Ki67 and p53 expression. The wild-type ERβ protein (ERβ1) was lost in male tumors, while it was a permanent feature in females, and a strong negative correlation was found between Ki67 and ERβ1 expression. Conversely, tumor levels of ERβ2 and ERβ5 did not significantly differ between genders. Increased levels of cyclin-dependent kinase inhibitor p21 were observed in females, suggesting that estrogen may decrease tumor growth through blocking cell cycle progression. An inhibition of the insulin-like growth factor I (IGF-I) signaling was also evident in females. Conclusion We provides mechanistic evidence supporting the idea that ERβ1 signaling may have pro-differentiation and tumor suppressive function in medulloblastomas.
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Cables1 controls p21/Cip1 protein stability by antagonizing proteasome subunit alpha type 3. Oncogene 2014; 34:2538-45. [PMID: 24975575 PMCID: PMC4617825 DOI: 10.1038/onc.2014.171] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 05/02/2014] [Accepted: 05/06/2014] [Indexed: 12/15/2022]
Abstract
The cyclin-dependent kinase inhibitor 1A (CDKN1A), p21/Cip1, is a vital cell cycle regulator, dysregulation of which has been associated with a large number of human malignancies. One critical mechanism that controls p21 function is through its degradation, which allows the activation of its associated cell cycle promoting kinases, CDK2 and CDK4. Thus, delineating how p21 is stabilized and degraded will enhance our understanding of cell growth control and offer a basis for potential therapeutic interventions. Here, we report a novel regulatory mechanism that controls the dynamic status of p21 through its interaction with Cdk5 and Ablenzyme substrate 1 (Cables1). Cables1 has a proposed role as a tumor suppressor. We found that upregulation of Cables1 protein was correlated with increased half-life of p21 protein, which was attributed to Cables1/p21 complex formation and supported by their co-localization in the nucleus. Mechanistically, Cables1 interferes with the proteasome (Prosome, Macropain) subunit alpha type 3 (PSMA3) binding to p21 and protects p21 from PSMA3-mediated proteasomal degradation. Moreover, silencing of p21 partially reverses the ability of Cables1 to induce cell death and inhibit cell proliferation. In further support of a potential pathophysiological role of Cables1, the expression level of Cables1 is tightly associated with p21 in both cancer cell lines and human lung cancer patient tumor samples. Together, these results suggest Cables1 as a novel p21 regulator through maintaining p21 stability, and support the model that the tumor suppressive function of Cables1 occurs at least in part through enhancing the tumor suppressive activity of p21.
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205
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Beinder L, Faehrmann N, Wachtveitl R, Winterfeld I, Hartner A, Menendez-Castro C, Rauh M, Ruebner M, Huebner H, Noegel SC, Doerr HG, Rascher W, Fahlbusch FB. Detection of expressional changes induced by intrauterine growth restriction in the developing rat mammary gland via exploratory pathways analysis. PLoS One 2014; 9:e100504. [PMID: 24955840 PMCID: PMC4067350 DOI: 10.1371/journal.pone.0100504] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Accepted: 05/26/2014] [Indexed: 12/29/2022] Open
Abstract
Background Intrauterine growth restriction (IUGR) is thought to lead to fetal programming that in turn contributes to developmental changes of many organs postnatally. There is evidence that IUGR is a risk factor for the development of metabolic and cardiovascular disease later in life. A higher incidence of breast cancer was also observed after IUGR. This could be due to changes in mammary gland developmental pathways. We sought to characterise IUGR-induced alterations of the complex pathways of mammary development at the level of the transcriptome in a rat model of IUGR, using pathways analysis bioinformatics. Methodology/Principal Findings We analysed the mammary glands of Wistar rats with IUGR induced by maternal low protein (LP) diet at the beginning (d21) and the end (d28) of pubertal ductal morphogenesis. Mammary glands of the LP group were smaller in size at d28, however did not show morphologic changes. We identified multiple differentially expressed genes in the mammary gland using Agilent SurePrint arrays at d21 and d28. In silico analysis was carried out using Ingenuity Pathways Analysis. In mammary gland tissue of LP rats at d21 of life a prominent upregulation of WT1 and CDKN1A (p21) expression was observed. Differentially regulated genes were associated with the extracellular regulated kinase (ERK)-1/-2 pathway. Western Blot analysis showed reduced levels of phosphorylated ERK-1/-2 in the mammary glands of the LP group at d21. To identify possible changes in circulating steroid levels, serum LC-Tandem mass-spectrometry was performed. LP rats showed higher serum progesterone levels and an increased corticosterone/dehydrocorticosterone-ratio at d28. Conclusions/Significance Our data obtained from gene array analysis support the hypothesis that IUGR influences pubertal development of the rat mammary gland. We identified prominent differential regulation of genes and pathways for factors regulating cell cycle and growth. Moreover, we detected new pathways which appear to be programmed by IUGR.
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Affiliation(s)
- Lea Beinder
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Nina Faehrmann
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Rainer Wachtveitl
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Ilona Winterfeld
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Andrea Hartner
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Carlos Menendez-Castro
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Manfred Rauh
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Matthias Ruebner
- Department of Gynecology and Obstetrics, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Hanna Huebner
- Department of Gynecology and Obstetrics, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Stephanie C. Noegel
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Helmuth G. Doerr
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Wolfgang Rascher
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Fabian B. Fahlbusch
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
- * E-mail:
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Abstract
BMP is highly expressed in glioblastoma and promotes differentiation of cancer stem cells (CSCs). Recently, Yan and colleagues found the explanation to this apparent paradox by showing that the antagonist of BMP, Gremlin1, is secreted by CSCs to protect them against the BMP-induced differentiation.
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Affiliation(s)
- Joan Seoane
- Vall d Hebron Institute of Oncology (VHIO), Vall d'Hebron University Hospital, 08035 Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain; Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain.
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207
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Chen L, Wang HJ, Xie W, Yao Y, Zhang YS, Wang H. Cryptotanshinone inhibits lung tumorigenesis and induces apoptosis in cancer cells in vitro and in vivo. Mol Med Rep 2014; 9:2447-52. [PMID: 24682389 DOI: 10.3892/mmr.2014.2093] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Accepted: 03/04/2014] [Indexed: 01/17/2023] Open
Abstract
Cryptotanshinone is one of the compounds extracted from the root of Salvia miltiorrhiza Bunge. Unlike other tanshinones, only a small number of studies have focused on cryptotanshinone for medical treatment. In the present study, the A549 lung cancer cell line and xenograft models of human lung tumors were used to assess the anti-cancer effect of cryptotanshinone. The effect of cryptotanshinone on human lung cancer, including growth inhibition, cell cycle arrest and apoptosis factors, were identified in vitro, and inhibition of tumor formation, improvement of body condition as well as pathological apoptotic effects were detected in vivo. These results suggested that cryptotanshinone is a potential drug for the treatment and prevention of human lung cancer.
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Affiliation(s)
- Liang Chen
- Department of Respiratory Medicine, The Second Affiliated Hospital of Dalian Medical University, Dalian Medical University, Dalian, Liaoning 116023, P.R. China
| | - Hui-Juan Wang
- Department of Tumor Chemotherapy, Wuwei Tumor Hospital, Wuwei, Gansu 733000, P.R. China
| | - Wenli Xie
- Department of Cardiology, The Second Affiliated Hospital of Dalian Medical University, Dalian Medical University, Dalian, Liaoning 116023, P.R. China
| | - Yunyi Yao
- Research Center for Biochemistry and Molecular Biology, Xuzhou Medical College, Xuzhou, Jiangsu 221004, P.R. China
| | - Yan-Shan Zhang
- Department of Tumor Surgery, Wuwei Tumor Hospital, Wuwei, Gansu 733000, P.R. China
| | - Huiling Wang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Dalian Medical University, Dalian Medical University, Dalian, Liaoning 116023, P.R. China
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208
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Less understood issues: p21Cip1 in mitosis and its therapeutic potential. Oncogene 2014; 34:1758-67. [DOI: 10.1038/onc.2014.133] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 04/16/2014] [Accepted: 04/16/2014] [Indexed: 12/18/2022]
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209
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Zhang H, Zhang X, Ji S, Hao C, Mu Y, Sun J, Hao J. Sohlh2 inhibits ovarian cancer cell proliferation by upregulation of p21 and downregulation of cyclin D1. Carcinogenesis 2014; 35:1863-71. [DOI: 10.1093/carcin/bgu113] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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210
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Targeting signal transducer and activator of transcription 3 contributes to the solamargine-inhibited growth and -induced apoptosis of human lung cancer cells. Tumour Biol 2014; 35:8169-78. [DOI: 10.1007/s13277-014-2047-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 05/01/2014] [Indexed: 10/25/2022] Open
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211
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de Renty C, DePamphilis ML, Ullah Z. Cytoplasmic localization of p21 protects trophoblast giant cells from DNA damage induced apoptosis. PLoS One 2014; 9:e97434. [PMID: 24848107 PMCID: PMC4029599 DOI: 10.1371/journal.pone.0097434] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 04/17/2014] [Indexed: 01/05/2023] Open
Abstract
Proliferating trophoblast stem cells (TSCs) can differentiate into nonproliferating but viable trophoblast giant cells (TGCs) that are resistant to DNA damage induced apoptosis. Differentiation is associated with selective up-regulation of the Cip/Kip cyclin-dependent kinase inhibitors p57 and p21; expression of p27 remains constant. Previous studies showed that p57 localizes to the nucleus in TGCs where it is essential for endoreplication. Here we show that p27 also remains localized to the nucleus during TSC differentiation where it complements the role of p57. Unexpectedly, p21 localized to the cytoplasm where it was maintained throughout both the G- and S-phases of endocycles, and where it prevented DNA damage induced apoptosis. This unusual status for a Cip/Kip protein was dependent on site-specific phosphorylation of p21 by the Akt1 kinase that is also up-regulated in TGCs. Although cytoplasmic p21 is widespread among cancer cells, among normal cells it has been observed only in monocytes. The fact that it also occurs in TGCs reveals that p57 and p21 serve nonredundant functions, and suggests that the role of p21 in suppressing apoptosis is restricted to terminally differentiated cells.
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Affiliation(s)
- Christelle de Renty
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Melvin L. DePamphilis
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Zakir Ullah
- Department of Biology, School of Science and Engineering, Lahore University of Management Sciences, Lahore, Pakistan
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212
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Safa M, Mousavizadeh K, Noori S, Pourfathollah A, Zand H. cAMP protects acute promyelocytic leukemia cells from arsenic trioxide-induced caspase-3 activation and apoptosis. Eur J Pharmacol 2014; 736:115-23. [PMID: 24815320 DOI: 10.1016/j.ejphar.2014.04.040] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 04/19/2014] [Accepted: 04/23/2014] [Indexed: 11/16/2022]
Abstract
More recently, arsenic trioxide (ATO), was integrated into acute promyelocytic leukemia (APL) treatment, showing high efficacy and tolerability in patients with both ATRA-sensitive and ATRA-resistant APL. ATO could induce apoptosis at relatively high concentrations (0.5 to 2.0 micromol/L) and partial differentiation at low concentrations (0.1 to 0.5 micromol/L) in leukemic promyelocytes. It is known that cAMP agonists enhance low-dose ATO-induced APL cells differentiation. Less well appreciated was the possible interaction between relatively high-doses of ATO and enhanced levels of cAMP in APL cells. Here, we show that elevation of cAMP levels by forskolin inhibited ATO-mediated apoptosis in APL-derived NB4 cells, and this inhibition could be averted by cell permeable cAMP-dependent protein kinase inhibitor (14-22) amide. Inactivating phosphorylation of the proapoptotic protein Bad at Ser118 and phosphorylation of the CREB proto-oncogene at Ser133 were observed upon elevation of cAMP levels in NB4 cells. Phosphorylation of these PKA target proteins is known to promote cell survival in AML cells. The ability of cAMP to endow the APL cells with survival advantage is of particular importance when cAMP agonists may be considered as adjuncts to APL therapy.
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Affiliation(s)
- Majid Safa
- Cellular and Molecular Research Center, Iran University of Medical Sciences, Tehran, Iran; Department of Hematology, Faculty of Allied Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Kazem Mousavizadeh
- Oncopathology Research Center, and Department of Molecular Medicine, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Shekoofeh Noori
- Department of Biochemistry, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Arefeh Pourfathollah
- Department of Medical Laboratory Sciences, Tehran University of Medical Sciences, Tehran, Iran
| | - Hamid Zand
- National Institute and Faculty of Nutrition and Food Technology, Department of Molecular Nutrition, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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213
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Cialfi S, Palermo R, Manca S, De Blasio C, Vargas Romero P, Checquolo S, Bellavia D, Uccelletti D, Saliola M, D'Alessandro A, Zolla L, Gulino A, Screpanti I, Talora C. Loss of Notch1-dependent p21(Waf1/Cip1) expression influences the Notch1 outcome in tumorigenesis. Cell Cycle 2014; 13:2046-55. [PMID: 24801890 DOI: 10.4161/cc.29079] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Notch signaling plays a complex role in carcinogenesis, and its signaling pathway has both tumor-suppressor and oncogenic components. In this study we investigated the effects of reactive oxygen species (ROS) on Notch1 signaling outcome in keratinocyte biology. We demonstrate that Notch1 function contributes to the arsenic-induced keratinocyte transformation. We found that acute exposure to arsenite increases oxidative stress and inhibits proliferation of keratinocyte cells by upregulation of p21(waf1/Cip1). The necessity of p21(waf1/Cip1) for arsenite-induced cell death was demonstrated by targeted downregulation of p21(waf1/Cip1) by using RNA interference. We further demonstrated that on acute exposure to arsenite, p21(waf1/Cip1) is upregulated and Notch1 downmodulated, whereas on chronic exposure to arsenite, malignant progression of arsenite-treated keratinocytes cells was accompanied by regained expression and activity of Notch1. Notch1 activity in arsenite-transformed keratinocytes inhibits arsenite-induced upregulation of p21(waf1/Cip1) by sustaining c-myc expression. We further demonstrated that c-myc collaborates with Nrf2, a key regulator for the maintenance of redox homeostasis, to promote metabolic activities that support cell proliferation and cytoprotection. Therefore, Notch1-mediated repression of p21(waf1/Cip1) expression results in the inhibition of cell death and keratinocytes transformation. Our results not only demonstrate that sustained Notch1 expression is at least one key event implicated in the arsenite human skin carcinogenic effect, but also may provide mechanistic insights into the molecular aspects that determine whether Notch signaling will be either oncogenic or tumor suppressive.
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Affiliation(s)
- Samantha Cialfi
- Department of Molecular Medicine; Sapienza University of Rome; Rome, Italy
| | - Rocco Palermo
- Center for Life Nanosciences at Sapienza; Istituto Italiano di Tecnologia; Rome, Italy
| | - Sonia Manca
- Department of Molecular Medicine; Sapienza University of Rome; Rome, Italy
| | - Carlo De Blasio
- Department of Molecular Medicine; Sapienza University of Rome; Rome, Italy
| | | | - Saula Checquolo
- Department of Biotechnology and Medical-Surgical Sciences; Sapienza University; Latina, Italy
| | - Diana Bellavia
- Department of Molecular Medicine; Sapienza University of Rome; Rome, Italy
| | - Daniela Uccelletti
- Department of Biology and Biotechnology "C. Darwin"; Sapienza University of Rome; Rome, Italy
| | - Michele Saliola
- Department of Biology and Biotechnology "C. Darwin"; Sapienza University of Rome; Rome, Italy
| | - Angelo D'Alessandro
- Department of Ecological and Biological Sciences; University of Tuscia; Viterbo, Italy
| | - Lello Zolla
- Department of Ecological and Biological Sciences; University of Tuscia; Viterbo, Italy
| | - Alberto Gulino
- Department of Molecular Medicine; Sapienza University of Rome; Rome, Italy; Center for Life Nanosciences at Sapienza; Istituto Italiano di Tecnologia; Rome, Italy; Neuromed Institute; Pozzilli, Italy
| | - Isabella Screpanti
- Department of Molecular Medicine; Sapienza University of Rome; Rome, Italy
| | - Claudio Talora
- Department of Molecular Medicine; Sapienza University of Rome; Rome, Italy
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214
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Zheng F, Tang Q, Wu J, Zhao S, Liang Z, Li L, Wu W, Hann S. p38α MAPK-mediated induction and interaction of FOXO3a and p53 contribute to the inhibited-growth and induced-apoptosis of human lung adenocarcinoma cells by berberine. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2014; 33:36. [PMID: 24766860 PMCID: PMC4013801 DOI: 10.1186/1756-9966-33-36] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 04/14/2014] [Indexed: 12/16/2022]
Abstract
Background Berberine (BBR), a component from traditional Chinese medicine, has been shown to possess anti-tumor activity against a wide spectrum of cancer cells including human lung cancer, but the detailed mechanism underlining this has not been well elucidated. Methods In this study, the effect of berberine on cell growth and apoptosis were assessed by MTT, flow cytometry and Hoechst 33258 staining assays. The phosphorylation of p38 MAPK and ERK1/2, and expressions of p38 MAPK isoforms α and β, total ERK1/2, p53, FOXO3a and p21 protein were evaluated by Western Blot analysis. Silencing of p38 MAPK isoform α and β, p53, FOXO3a and p21 were performed by siRNA methods. Exogenous expression of FOXO3a was carried out by electroporated transfection assays. Results We showed that BBR significantly inhibited growth and induced cell cycle arrest of non small cell lung cancer (NSCLC) cells in the G0/G1 phase in a dose-dependent manner. Furthermore, we found that BBR increased phosphorylation of p38 MAPK and ERK1/2 in a time-dependent and induced protein expression of tumor suppressor p53 and transcription factor FOXO3a in a dose-dependent fashion. The specific inhibitor of p38 MAPK (SB203580), and silencing of p38α MAPK by small interfering RNAs (siRNAs), but not ERK1/2 inhibitor (PD98059) blocked the stimulatory effects of BBR on protein expression of p53 and FOXO3a. Interestingly, inhibition of p53 using one specific inhibitor (Pifithrin-α) and silencing of p53 using siRNAs overcome the inhibitory effect of BBR on cell growth. Silencing of FOXO3a appeared to attenuate the effect of BBR on p53 expression, cell proliferation and apoptosis. Furthermore, BBR induces the protein expression of cell cycle inhibitor p21 (CIP1/WAF1), which was not observed in cells silencing of p53 or FOXO3α gene. Intriguingly, exogenous expression of FOXO3a enhanced the expression of p21 (CIP1/WAF1) and strengthened BBR-induced apoptosis. Conclusion Our results show that BBR inhibits proliferation and induces apoptosis of NSCLC cells through activation of p38α MAPK signaling pathway, followed by induction of the protein expression of p53 and FOXO3a. The latter contribute to the BBR-increased p21 (CIP1/WAF1) protein expression. The exogenous FOXO3a, interaction and mutually exclusive events of p53 and FOXO3a augment the overall response of BBR.
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Affiliation(s)
| | | | | | | | | | | | | | - Swei Hann
- Laboratory of Tumor Molecular Biology and Targeted Therapies of Chinese Medicine, 4th Floor, Scientific Research Building, Neihuan West Road No, 55, University City, Panyu District, Guangzhou, Guangdong Province, P, R, China, 510006.
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215
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Zhang Y, Hu K, Hu Y, Liu L, Wang B, Huang H. Bone marrow mesenchymal stromal cells affect the cell cycle arrest effect of genotoxic agents on acute lymphocytic leukemia cells via p21 down-regulation. Ann Hematol 2014; 93:1499-508. [PMID: 24705889 DOI: 10.1007/s00277-014-2069-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Accepted: 03/24/2014] [Indexed: 10/25/2022]
Abstract
The effect of bone marrow microenvironment on the cell cycle of acute lymphocytic leukemia (ALL) and the underlying mechanism has not been elucidated. In this study, we found that in normal condition, bone marrow mesenchymal stromal cells (BM-MSCs) had no significant effect on the cell cycle and apoptosis of ALL; in the condition when the cell cycle of ALL was blocked by genotoxic agents, BM-MSCs could increase the S-phase cell ratio and decrease the G2/M phase ratio of ALL. Besides, BM-MSCs could protect ALL cells from drug-induced apoptosis. Then, we proved that BM-MSCs affect the cell cycle arrest effect of genotoxic agents on ALL cells via p21 down-regulation. Moreover, our results indicated that activation of Wnt/β-catenin and Erk pathways might be involved in the BM-MSC-induced down-regulation of p21 in ALL cells. Targeting microenvironment-related signaling pathway may therefore be a potential novel approach for ALL therapy.
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Affiliation(s)
- Yiran Zhang
- Bone Marrow Transplantation Center, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310003, China
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216
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Zhou Y, Zhang X, Klibanski A. Genetic and epigenetic mutations of tumor suppressive genes in sporadic pituitary adenoma. Mol Cell Endocrinol 2014; 386:16-33. [PMID: 24035864 PMCID: PMC3943596 DOI: 10.1016/j.mce.2013.09.006] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 09/03/2013] [Indexed: 12/28/2022]
Abstract
Human pituitary adenomas are the most common intracranial neoplasms. Approximately 5% of them are familial adenomas. Patients with familial tumors carry germline mutations in predisposition genes, including AIP, MEN1 and PRKAR1A. These mutations are extremely rare in sporadic pituitary adenomas, which therefore are caused by different mechanisms. Multiple tumor suppressive genes linked to sporadic tumors have been identified. Their inactivation is caused by epigenetic mechanisms, mainly promoter hypermethylation, and can be placed into two groups based on their functional interaction with tumor suppressors RB or p53. The RB group includes CDKN2A, CDKN2B, CDKN2C, RB1, BMP4, CDH1, CDH13, GADD45B and GADD45G; AIP and MEN1 genes also belong to this group. The p53 group includes MEG3, MGMT, PLAGL1, RASSF1, RASSF3 and SOCS1. We propose that the tumor suppression function of these genes is mainly mediated by the RB and p53 pathways. We also discuss possible tumor suppression mechanisms for individual genes.
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Affiliation(s)
- Yunli Zhou
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, United States
| | - Xun Zhang
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, United States
| | - Anne Klibanski
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, United States.
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217
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The impact of R213 mutation on p53-mediated p21 activity. Biochimie 2014; 99:215-8. [DOI: 10.1016/j.biochi.2013.12.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Accepted: 12/20/2013] [Indexed: 12/18/2022]
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218
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Abstract
Urothelial carcinoma of the bladder is a common malignancy that causes approximately 150,000 deaths per year worldwide. So far, no molecularly targeted agents have been approved for treatment of the disease. As part of The Cancer Genome Atlas project, we report here an integrated analysis of 131 urothelial carcinomas to provide a comprehensive landscape of molecular alterations. There were statistically significant recurrent mutations in 32 genes, including multiple genes involved in cell-cycle regulation, chromatin regulation, and kinase signalling pathways, as well as 9 genes not previously reported as significantly mutated in any cancer. RNA sequencing revealed four expression subtypes, two of which (papillary-like and basal/squamous-like) were also evident in microRNA sequencing and protein data. Whole-genome and RNA sequencing identified recurrent in-frame activating FGFR3-TACC3 fusions and expression or integration of several viruses (including HPV16) that are associated with gene inactivation. Our analyses identified potential therapeutic targets in 69% of the tumours, including 42% with targets in the phosphatidylinositol-3-OH kinase/AKT/mTOR pathway and 45% with targets (including ERBB2) in the RTK/MAPK pathway. Chromatin regulatory genes were more frequently mutated in urothelial carcinoma than in any other common cancer studied so far, indicating the future possibility of targeted therapy for chromatin abnormalities.
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219
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Chang WA, Lin ES, Tsai MJ, Huang MS, Kuo PL. Isolinderalactone inhibits proliferation of A549 human non‑small cell lung cancer cells by arresting the cell cycle at the G0/G1 phase and inducing a Fas receptor and soluble Fas ligand-mediated apoptotic pathway. Mol Med Rep 2014; 9:1653-9. [PMID: 24604009 DOI: 10.3892/mmr.2014.2015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Accepted: 02/05/2014] [Indexed: 11/06/2022] Open
Abstract
Lung cancer is currently the leading cause of cancer-related mortality worldwide. In Taiwan, lung cancer is also the type of malignancy that is the major cause of cancer-mortality. Investigating the mechanism of apoptosis of lung cancer cells is important in the treatment of lung cancer. In the present study, isolinderalactone was demonstrated to exhibit anticancer effects in A549 human non-small cell lung cancer cells. The effect of isolinderalactone on apoptosis, cell cycle distribution p21 levels and the Fas receptor and soluble Fas ligand (sFasL) were assayed in order to determine the mechanism underlying the anticancer effect of isolinderalactone. It was demonstrated that isolinderalactone may induce p21 expression and then cause the cell cycle arrest of A549 cells. The data of the present study also revealed that the Fas/sFasL apoptotic system is significant in the mechanism of isolinderalactone‑induced apoptosis of A549 cells. These novel findings demonstrated that isolinderalactone may cause the cell cycle arrest of A549 cells by induction of p21, and induce apoptosis of A549 human non-small-cell lung carcinoma cells through the Fas/sFasL apoptotic system.
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Affiliation(s)
- Wei-An Chang
- Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan R.O.C
| | - En-Shyh Lin
- Department of Beauty Science, National Taichung University of Science and Technology, Taichung 403, Taiwan R.O.C
| | - Ming-Ju Tsai
- Division of Pulmonary and Critical Care Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan R.O.C
| | - Ming-Shyan Huang
- Division of Pulmonary and Critical Care Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan R.O.C
| | - Po-Lin Kuo
- Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan R.O.C
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220
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A statistical approach towards the derivation of predictive gene sets for potency ranking of chemicals in the mouse embryonic stem cell test. Toxicol Lett 2014; 225:342-9. [DOI: 10.1016/j.toxlet.2014.01.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 01/15/2014] [Accepted: 01/17/2014] [Indexed: 11/24/2022]
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221
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Rauch A, Hennig D, Schäfer C, Wirth M, Marx C, Heinzel T, Schneider G, Krämer OH. Survivin and YM155: how faithful is the liaison? Biochim Biophys Acta Rev Cancer 2014; 1845:202-20. [PMID: 24440709 DOI: 10.1016/j.bbcan.2014.01.003] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 01/01/2014] [Accepted: 01/04/2014] [Indexed: 02/07/2023]
Abstract
Survivin belongs to the family of apoptosis inhibitors (IAPs), which antagonizes the induction of cell death. Dysregulated expression of IAPs is frequently observed in cancers, and the high levels of survivin in tumors compared to normal adult tissues make it an attractive target for pharmacological interventions. The small imidazolium-based compound YM155 has recently been reported to block the expression of survivin via inhibition of the survivin promoter. Recent data, however, question that this is the sole and main effect of this drug, which is already being tested in ongoing clinical studies. Here, we critically review the current data on YM155 and other new experimental agents supposed to antagonize survivin. We summarize how cells from various tumor entities and with differential expression of the tumor suppressor p53 respond to this agent in vitro and as murine xenografts. Additionally, we recapitulate clinical trials conducted with YM155. Our article further considers the potency of YM155 in combination with other anti-cancer agents and epigenetic modulators. We also assess state-of-the-art data on the sometimes very promiscuous molecular mechanisms affected by YM155 in cancer cells.
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Affiliation(s)
- Anke Rauch
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Dorle Hennig
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Claudia Schäfer
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Matthias Wirth
- II Department of Internal Medicine, Technical University of Munich, Munich, Germany
| | - Christian Marx
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Thorsten Heinzel
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Günter Schneider
- II Department of Internal Medicine, Technical University of Munich, Munich, Germany
| | - Oliver H Krämer
- Department of Toxicology, University Medical Center, Obere Zahlbacher Str. 67, 55131 Mainz, Germany.
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Gore AJ, Deitz SL, Palam LR, Craven KE, Korc M. Pancreatic cancer-associated retinoblastoma 1 dysfunction enables TGF-β to promote proliferation. J Clin Invest 2013; 124:338-52. [PMID: 24334458 DOI: 10.1172/jci71526] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Accepted: 10/10/2013] [Indexed: 12/20/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is often associated with overexpression of TGF-β. Given its tumor suppressor functions, it is unclear whether TGF-β is a valid therapeutic target for PDAC. Here, we found that proliferating pancreatic cancer cells (PCCs) from human PDAC patients and multiple murine models of PDAC (mPDAC) often exhibit abundant levels of phosphorylated retinoblastoma 1 (RB) and Smad2. TGF-β1 treatment enhanced proliferation of PCCs isolated from KrasG12D-driven mPDAC that lacked RB (KRC cells). This mitogenic effect was abrogated by pharmacological inhibition of type I TGF-β receptor kinase, combined inhibition of MEK/Src or MEK/PI3K, and restoration of RB expression. TGF-β1 promoted epithelial-to-mesenchymal transition (EMT), invasion, Smad2/3 phosphorylation, Src activation, Wnt reporter activity, and Smad-dependent upregulation of Wnt7b in KRC cells. Importantly, TGF-β1-induced mitogenesis was markedly attenuated by inhibition of Wnt secretion. In an in vivo syngeneic orthotopic model, inhibition of TGF-β signaling suppressed KRC cell proliferation, tumor growth, stroma formation, EMT, metastasis, ascites formation, and Wnt7b expression, and markedly prolonged survival. Together, these data indicate that RB dysfunction converts TGF-β to a mitogen that activates known oncogenic signaling pathways and upregulates Wnt7b, which synergize to promote PCC invasion, survival, and mitogenesis. Furthermore, this study suggests that concomitantly targeting TGF-β and Wnt7b signaling in PDAC may disrupt these aberrant pathways, which warrants further evaluation in preclinical models.
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Abstract
Structural studies of members of the CDK (cyclin-dependent protein kinase) family have made a significant contribution to our understanding of the regulation of protein kinases. The structure of monomeric unphosphorylated CDK2 was the first of an inactive protein kinase to be determined and, since then, structures of other members of the CDK family, alone, in complex with regulatory proteins and in differing phosphorylation states, have enhanced our understanding of the molecular mechanisms regulating protein kinase activity. Recently, our knowledge of the structural biology of the CDK family has been extended by determination of structures for members of the transcriptional CDK and CDK-like kinase branches of the extended family. We include these recent structures in the present review and consider them in the light of current models for CDK activation and regulation.
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224
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Lee MYWT, Zhang S, Lin SHS, Wang X, Darzynkiewicz Z, Zhang Z, Lee EYC. The tail that wags the dog: p12, the smallest subunit of DNA polymerase δ, is degraded by ubiquitin ligases in response to DNA damage and during cell cycle progression. Cell Cycle 2013; 13:23-31. [PMID: 24300032 DOI: 10.4161/cc.27407] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
DNA polymerase δ (Pol δ) is a key enzyme in eukaryotic DNA replication. Human Pol δ is a heterotetramer whose p12 subunit is degraded in response to DNA damage, leading to the in vivo conversion of Pol δ4 to Pol δ3. Two E3 ubiquitin ligases, RNF8 and CRL4(Cdt2), participate in the DNA damage-induced degradation of p12. We discuss how these E3 ligases integrate the formation of Pol δ3 and ubiquitinated PCNA for DNA repair processes. CRL4(Cdt2) partially degrades p12 during normal cell cycle progression, thereby generating Pol δ3 during S phase. This novel finding extends the current view of the role of Pol δ3 in DNA repair and leads to the hypothesis that it participates in DNA replication. The coordinated regulation of licensing factors and Pol δ3 by CRL4(Cdt2) now opens new avenues for control of DNA replication. A parallel study of Pol δ4 and Pol δ3 in Okazaki fragment processing provides evidence for a role of Pol δ3 in DNA replication. We discuss several new perspectives of the role of the 2 forms of Pol δ in DNA replication and repair, as well the significance of the integration of p12 regulation in DNA repair and cell cycle progression.
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Affiliation(s)
- Marietta Y W T Lee
- Department of Biochemistry and Molecular Biology; New York Medical College; Valhalla, NY USA
| | - Sufang Zhang
- Department of Biochemistry and Molecular Biology; New York Medical College; Valhalla, NY USA
| | - Szu Hua Sharon Lin
- Department of Biochemistry and Molecular Biology; New York Medical College; Valhalla, NY USA
| | - Xiaoxiao Wang
- Department of Biochemistry and Molecular Biology; New York Medical College; Valhalla, NY USA
| | - Zbigniew Darzynkiewicz
- Department of Pathology; Brander Cancer Research Institute; New York Medical College; Valhalla, NY USA
| | - Zhongtao Zhang
- Department of Biochemistry and Molecular Biology; New York Medical College; Valhalla, NY USA
| | - Ernest Y C Lee
- Department of Biochemistry and Molecular Biology; New York Medical College; Valhalla, NY USA
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225
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Zhao Y, Guo J, Zhang X, Zhang Z, Gu S, Fei C, Li X, Chang C. Downregulation of p21 in myelodysplastic syndrome is associated with p73 promoter hypermethylation and indicates poor prognosis. Am J Clin Pathol 2013; 140:819-27. [PMID: 24225749 DOI: 10.1309/ajcpz5e6iwpwszxe] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
OBJECTIVES p21 Can both promote and inhibit tumorigenic processes. We explored the role of p21 in myelodysplastic syndrome (MDS). METHODS In this study, we analyzed p21 expression and p73 methylation in 88 patients with de novo MDS. RESULTS We found decreased expression of the p21 gene in higher-risk MDS compared with lower-risk groups or healthy controls (P < .05). Patients with p73 methylation had lower p21 than those in the unmethylated group (P < .001). Moreover, there was a significantly positive correlation between p73 and p21 expression in MDS (r = 0.436, P < .001). In vitro assays further confirm the role of p73 methylation in p21 expression. Compared with patients with normal expression levels of p21, patients with lower p21 expression levels experienced much higher rates of transformation to acute myeloid leukemia and lower overall survival both in univariate as well as multivariate analyses. CONCLUSIONS Our results suggest p21 expression may serve as a new biomarker to predict clinical outcome in patients with MDS.
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Affiliation(s)
- Youshan Zhao
- Department of Hematology, The Sixth Hospital affiliated to Shanghai Jiaotong University, Shanghai, China
| | - Juan Guo
- Department of Hematology, The Sixth Hospital affiliated to Shanghai Jiaotong University, Shanghai, China
| | - Xi Zhang
- Department of Hematology, The Sixth Hospital affiliated to Shanghai Jiaotong University, Shanghai, China
| | - Zheng Zhang
- Department of Hematology, The Sixth Hospital affiliated to Shanghai Jiaotong University, Shanghai, China
| | - Shucheng Gu
- Department of Hematology, The Sixth Hospital affiliated to Shanghai Jiaotong University, Shanghai, China
| | - Chengmin Fei
- Department of Hematology, The Sixth Hospital affiliated to Shanghai Jiaotong University, Shanghai, China
| | - Xiao Li
- Department of Hematology, The Sixth Hospital affiliated to Shanghai Jiaotong University, Shanghai, China
| | - Chunkang Chang
- Department of Hematology, The Sixth Hospital affiliated to Shanghai Jiaotong University, Shanghai, China
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226
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Mirzayans R, Andrais B, Scott A, Wang YW, Murray D. Ionizing radiation-induced responses in human cells with differing TP53 status. Int J Mol Sci 2013; 14:22409-35. [PMID: 24232458 PMCID: PMC3856071 DOI: 10.3390/ijms141122409] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 10/29/2013] [Accepted: 11/04/2013] [Indexed: 12/20/2022] Open
Abstract
Ionizing radiation triggers diverse responses in human cells encompassing apoptosis, necrosis, stress-induced premature senescence (SIPS), autophagy, and endopolyploidy (e.g., multinucleation). Most of these responses result in loss of colony-forming ability in the clonogenic survival assay. However, not all modes of so-called clonogenic cell "death" are necessarily advantageous for therapeutic outcome in cancer radiotherapy. For example, the crosstalk between SIPS and autophagy is considered to influence the capacity of the tumor cells to maintain a prolonged state of growth inhibition that unfortunately can be succeeded by tumor regrowth and disease recurrence. Likewise, endopolyploid giant cells are able to segregate into near diploid descendants that continue mitotic activities. Herein we review the current knowledge on the roles that the p53 and p21(WAF1) tumor suppressors play in determining the fate of human fibroblasts (normal and Li-Fraumeni syndrome) and solid tumor-derived cells after exposure to ionizing radiation. In addition, we discuss the important role of WIP1, a p53-regulated oncogene, in the temporal regulation of the DNA damage response and its contribution to p53 dynamics post-irradiation. This article highlights the complexity of the DNA damage response and provides an impetus for rethinking the nature of cancer cell resistance to therapeutic agents.
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Affiliation(s)
- Razmik Mirzayans
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, AB T6G 1Z2, Canada; E-Mails: (B.A.); (A.S.); (Y.W.W.); (D.M.)
| | - Bonnie Andrais
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, AB T6G 1Z2, Canada; E-Mails: (B.A.); (A.S.); (Y.W.W.); (D.M.)
| | - April Scott
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, AB T6G 1Z2, Canada; E-Mails: (B.A.); (A.S.); (Y.W.W.); (D.M.)
| | - Ying W. Wang
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, AB T6G 1Z2, Canada; E-Mails: (B.A.); (A.S.); (Y.W.W.); (D.M.)
| | - David Murray
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, AB T6G 1Z2, Canada; E-Mails: (B.A.); (A.S.); (Y.W.W.); (D.M.)
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227
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Ryynänen J, Seuter S, Campbell MJ, Carlberg C. Gene regulatory scenarios of primary 1,25-dihydroxyvitamin d3 target genes in a human myeloid leukemia cell line. Cancers (Basel) 2013; 5:1221-41. [PMID: 24202443 PMCID: PMC3875937 DOI: 10.3390/cancers5041221] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 09/19/2013] [Accepted: 09/26/2013] [Indexed: 12/14/2022] Open
Abstract
Genome- and transcriptome-wide data has significantly increased the amount of available information about primary 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) target genes in cancer cell models, such as human THP-1 myelomonocytic leukemia cells. In this study, we investigated the genes G0S2, CDKN1A and MYC as master examples of primary vitamin D receptor (VDR) targets being involved in the control of cellular proliferation. The chromosomal domains of G0S2 and CDKN1A are 140-170 kb in size and contain one and three VDR binding sites, respectively. This is rather compact compared to the MYC locus that is 15 times larger and accommodates four VDR binding sites. All eight VDR binding sites were studied by chromatin immunoprecipitation in THP-1 cells. Interestingly, the site closest to the transcription start site of the down-regulated MYC gene showed 1,25(OH)2D3-dependent reduction of VDR binding and is not associated with open chromatin. Four of the other seven VDR binding regions contain a typical DR3-type VDR binding sequence, three of which are also occupied with VDR in macrophage-like cells. In conclusion, the three examples suggest that each VDR target gene has an individual regulatory scenario. However, some general components of these scenarios may be useful for the development of new therapy regimens.
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Affiliation(s)
- Jussi Ryynänen
- School of Medicine, Institute of Biomedicine, University of Eastern Finland, POB 1627, Kuopio FI-70211, Finland; E-Mails: (J.R.), (S.S.)
| | - Sabine Seuter
- School of Medicine, Institute of Biomedicine, University of Eastern Finland, POB 1627, Kuopio FI-70211, Finland; E-Mails: (J.R.), (S.S.)
| | - Moray J. Campbell
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263, USA; E-Mail:
| | - Carsten Carlberg
- School of Medicine, Institute of Biomedicine, University of Eastern Finland, POB 1627, Kuopio FI-70211, Finland; E-Mails: (J.R.), (S.S.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +358-40-355-3062
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Qiao S, Tao S, Rojo de la Vega M, Park SL, Vonderfecht AA, Jacobs SL, Zhang DD, Wondrak GT. The antimalarial amodiaquine causes autophagic-lysosomal and proliferative blockade sensitizing human melanoma cells to starvation- and chemotherapy-induced cell death. Autophagy 2013; 9:2087-102. [PMID: 24113242 DOI: 10.4161/auto.26506] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Pharmacological inhibition of autophagic-lysosomal function has recently emerged as a promising strategy for chemotherapeutic intervention targeting cancer cells. Repurposing approved and abandoned non-oncological drugs is an alternative approach to the identification and development of anticancer therapeutics, and antimalarials that target autophagic-lysosomal functions have recently attracted considerable attention as candidates for oncological repurposing. Since cumulative research suggests that dependence on autophagy represents a specific vulnerability of malignant melanoma cells, we screened a focused compound library of antimalarials for antimelanoma activity. Here we report for the first time that amodiaquine (AQ), a clinical 4-aminoquinoline antimalarial with unexplored cancer-directed chemotherapeutic potential, causes autophagic-lysosomal and proliferative blockade in melanoma cells that surpasses that of its parent compound chloroquine. Monitoring an established set of protein markers (LAMP1, LC3-II, SQSTM1) and cell ultrastructural changes detected by electron microscopy, we observed that AQ treatment caused autophagic-lysosomal blockade in malignant A375 melanoma cells, a finding substantiated by detection of rapid inactivation of lysosomal cathepsins (CTSB, CTSL, CTSD). AQ-treatment was associated with early induction of energy crisis (ATP depletion) and sensitized melanoma cells to either starvation- or chemotherapeutic agent-induced cell death. AQ displayed potent antiproliferative effects, and gene expression array analysis revealed changes at the mRNA (CDKN1A, E2F1) and protein level (TP53, CDKN1A, CCND1, phospho-RB1 [Ser 780]/[Ser 807/811], E2F1) consistent with the observed proliferative blockade in S-phase. Taken together, our data suggest that the clinical antimalarial AQ is a promising candidate for repurposing efforts that aim at targeting autophagic-lysosomal function and proliferative control in malignant melanoma cells.
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Affiliation(s)
- Shuxi Qiao
- Department of Pharmacology and Toxicology; College of Pharmacy and Arizona Cancer Center; University of Arizona; Tucson, AZ USA
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QIAO SHUKAI, REN HANYUN, SHI YONGJIN, LIU WEI. Silencing HCCR2 expression inhibits the proliferation of leukemia cells by inducing apoptosis and promoting cell cycle arrest. Int J Mol Med 2013; 32:1373-9. [DOI: 10.3892/ijmm.2013.1518] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 09/30/2013] [Indexed: 11/06/2022] Open
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PTEN ablation in RasHa/Fos skin carcinogenesis invokes p53-dependent p21 to delay conversion while p53-independent p21 limits progression via cyclin D1/E2 inhibition. Oncogene 2013; 33:4132-43. [DOI: 10.1038/onc.2013.372] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 05/28/2013] [Accepted: 07/12/2013] [Indexed: 12/23/2022]
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231
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Andrographolide causes apoptosis via inactivation of STAT3 and Akt and potentiates antitumor activity of gemcitabine in pancreatic cancer. Toxicol Lett 2013; 222:23-35. [DOI: 10.1016/j.toxlet.2013.06.241] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 06/21/2013] [Accepted: 06/27/2013] [Indexed: 01/20/2023]
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232
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Vinante F, Tomei P, Zaza G, Zamò A, Lupo A. Hairy cell leukemia in kidney transplantation: lesson from a rare disorder. Exp Hematol Oncol 2013; 2:22. [PMID: 23927433 PMCID: PMC3750510 DOI: 10.1186/2162-3619-2-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Accepted: 08/02/2013] [Indexed: 11/10/2022] Open
Abstract
We report here on the diagnosis and successful treatment of a case of hairy cell leukemia (HCL) that arose 15 years after kidney transplantation in a 51-year-old patient. As soon as the diagnosis was made, HCL was treated with 2-CDA, obtaining complete hematological remission. Immunosuppression with the calcineurin inhibitor cyclosporin was maintained, and the graft was preserved. In kidney transplant recipients supported with immunosuppressive drugs, post-transplant lymphoproliferative diseases (PTLDs) are frequent and typically related to immunosuppression via a loss of control of infectious/EBV-related proliferative stimuli. To date, HCL has not been considered among PTLDs. Recently, however, the oncogenic mutation V600E of the BRAF protein kinase has been found to be a hallmark of HCL, and calcineurin inhibitors have been shown to interfere with signaling downstream of V600E BRAF early on by counteracting senescence-associated mechanisms that protect against the oncogenic potential of the mutated kinase. Such a biochemical link between the oncogene-dependent signaling and calcineurin inhibitor activities suggests that HCL in transplanted patients might be a peculiar type of PTLD based on the presence of a specific mutation. This mechanism might also be involved in other neoplasias bearing the same or similar mutations, such as melanoma and non-melanoma skin cancer.
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Affiliation(s)
- Fabrizio Vinante
- Section of Hematology, Department of Medicine, University of Verona, Verona, Italy
| | - Paola Tomei
- Renal Unit, Department of Medicine, University Hospital of Verona, Verona, Italy
| | - Gianluigi Zaza
- Renal Unit, Department of Medicine, University Hospital of Verona, Verona, Italy
| | - Alberto Zamò
- Section of Pathological Anatomy, Department of Pathology and Diagnostics, University of Verona, Verona, Italy
| | - Antonio Lupo
- Renal Unit, Department of Medicine, University Hospital of Verona, Verona, Italy
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233
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Chen JJ, Long ZJ, Xu DF, Xiao RZ, Liu LL, Xu ZF, Qiu SX, Lin DJ, Liu Q. Inhibition of autophagy augments the anticancer activity of α-mangostin in chronic myeloid leukemia cells. Leuk Lymphoma 2013; 55:628-38. [DOI: 10.3109/10428194.2013.802312] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Hernandez AM, Colvin ES, Chen YC, Geiss SL, Eller LE, Fueger PT. Upregulation of p21 activates the intrinsic apoptotic pathway in β-cells. Am J Physiol Endocrinol Metab 2013; 304:E1281-90. [PMID: 23592481 PMCID: PMC3680698 DOI: 10.1152/ajpendo.00663.2012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Diabetes manifests from a loss in functional β-cell mass, which is regulated by a dynamic balance of various cellular processes, including β-cell growth, proliferation, and death as well as secretory function. The cell cycle machinery comprised of cyclins, kinases, and inhibitors regulates proliferation. However, their involvement during β-cell stress during the development of diabetes is not well understood. Interestingly, in a screen of multiple cell cycle inhibitors, p21 was dramatically upregulated in INS-1-derived 832/13 cells and rodent islets by two pharmacological inducers of β-cell stress, dexamethasone and thapsigargin. We hypothesized that β-cell stress upregulates p21 to activate the apoptotic pathway and suppress cell survival signaling. To this end, p21 was adenovirally overexpressed in pancreatic rat islets and 832/13 cells. As expected, p21 overexpression resulted in decreased [(3)H]thymidine incorporation. Flow cytometry analysis in p21-transduced 832/13 cells verified lower replication, as indicated by a decreased cell population in the S phase and a block in G2/M transition. The sub-G0 cell population was higher with p21 overexpression and was attributable to apoptosis, as demonstrated by increased annexin-positive stained cells and cleaved caspase-3 protein. p21-mediated caspase-3 cleavage was inhibited by either overexpression of the antiapoptotic mitochondrial protein Bcl-2 or siRNA-mediated suppression of the proapoptotic proteins Bax and Bak. Therefore, an intact intrinsic apoptotic pathway is central for p21-mediated cell death. In summary, our findings indicate that β-cell apoptosis can be triggered by p21 during stress and is thus a potential target to inhibit for protection of functional β-cell mass.
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235
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A review on ochratoxin A transcriptomic studies. Food Chem Toxicol 2013; 59:766-83. [PMID: 23747715 DOI: 10.1016/j.fct.2013.05.043] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 05/25/2013] [Accepted: 05/28/2013] [Indexed: 10/26/2022]
Abstract
The mycotoxin Ochratoxin A (OTA) is a potent renal carcinogen in male rats. Transcriptomic studies on OTA (4 in vitro, 6 in vivo, 2 in vitro/in vivo) have been reviewed. The aim of 6 of them was mainly mechanistic whereas the rest had mostly predictive (1) or evaluation (5) purposes. An overall tendency towards gene expression downregulation was observed, probably as a result of protein synthesis inhibition. DNA damage response genes were not deregulated in most of the studies. Genes involved in acute renal injury, cell survival and cell proliferation were upregulated in several in vivo studies. Apoptosis genes were deregulated in vitro but less affected in vivo; activation of several MAPKs has been observed. Many genes related to oxidative stress or involved in cell-to-cell interaction pathways (Wnt) or cytoskeleton structure appeared to be deregulated either in vitro or in vivo. Regucalcin was highly downregulated in vivo and other calcium homeostasis genes were significantly deregulated in vitro. Genes related to OTA transport (OATs) and metabolism (CYPs) appeared downregulated in vivo. Overall, the mechanism of action of OTA remains unclear, however transcriptomic data have contributed to new mechanistic hypothesis generation and to in vitro-in vivo comparison.
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Lauxen IS, Oliveira MG, Rados PV, Lingen MW, Nör JE, Sant'ana Filho M. Immunoprofiling of oral squamous cell carcinomas reveals high p63 and survivin expression. Oral Dis 2013; 20:e76-80. [PMID: 23738964 DOI: 10.1111/odi.12136] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 04/23/2013] [Accepted: 05/09/2013] [Indexed: 12/28/2022]
Abstract
BACKGROUND Cancer is a multifactorial disease composed of cells that show somatic mutations and epigenetic changes. The aim of this study was to investigate the expression of proteins involved in the development and maintenance of epithelia, cell cycle regulation, and apoptosis in human oral squamous cell carcinoma (OSCC) tissue samples. METHODS A tissue microarray containing 65 primary human OSCC specimens was immunolabeled for bcl-2, survivin, epidermal growth factor receptor (EGFR), p21, p53, p63, and cleaved caspase-3. RESULTS Samples were scored for percentage of positively stained tumor cells and staining intensity. A total immunostaining score was also calculated, using the product of percentage and intensity scores. All specimens showed high scores, > 75%, for p63 and survivin, and 75.4% of the specimens also presented high EGFR expression. All cases showed p53-positive cells. p21 showed a diffuse staining pattern. The percentage of cells positive for cleaved caspase-3 and bcl-2 was low. CONCLUSIONS The high frequency of tumor cells expressing p63 and survivin highlights the role of these proteins in the malignant transformation of oral epithelium. Collectively, our results suggest that p63 and survivin may constitute attractive targets for cancer therapy in patients with OSCC.
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Affiliation(s)
- I S Lauxen
- Oral Pathology, School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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Micco M, Collie GW, Dale AG, Ohnmacht SA, Pazitna I, Gunaratnam M, Reszka AP, Neidle S. Structure-based design and evaluation of naphthalene diimide G-quadruplex ligands as telomere targeting agents in pancreatic cancer cells. J Med Chem 2013; 56:2959-74. [PMID: 23514618 DOI: 10.1021/jm301899y] [Citation(s) in RCA: 141] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Tetra-substituted naphthalene diimide (ND) derivatives with positively charged termini are potent stabilizers of human telomeric and gene promoter DNA quadruplexes and inhibit the growth of human cancer cells in vitro and in vivo. The present study reports the enhancement of the pharmacological properties of earlier ND compounds using structure-based design. Crystal structures of three complexes with human telomeric intramolecular quadruplexes demonstrate that two of the four strongly basic N-methyl-piperazine groups can be replaced by less basic morpholine groups with no loss of intermolecular interactions in the grooves of the quadruplex. The new compounds retain high affinity to human telomeric quadruplex DNA but are 10-fold more potent against the MIA PaCa-2 pancreatic cancer cell line, with IC50 values of ~10 nM. The lead compound induces cellular senescence but does not inhibit telomerase activity at the nanomolar dosage levels required for inhibition of cellular proliferation. Gene array qPCR analysis of MIA PaCa-2 cells treated with the lead compound revealed significant dose-dependent modulation of a distinct subset of genes, including strong induction of DNA damage responsive genes CDKN1A, DDIT3, GADD45A/G, and PPM1D, and repression of genes involved in telomere maintenance, including hPOT1 and PARP1.
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Affiliation(s)
- Marialuisa Micco
- The School of Pharmacy, University College London, London WC1N 1AX, UK
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