151
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Riffle S, Pandey RN, Albert M, Hegde RS. Linking hypoxia, DNA damage and proliferation in multicellular tumor spheroids. BMC Cancer 2017; 17:338. [PMID: 28521819 PMCID: PMC5437385 DOI: 10.1186/s12885-017-3319-0] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 05/03/2017] [Indexed: 01/08/2023] Open
Abstract
Background Multicellular Tumor Spheroids are frequently used to mimic the regionalization of proliferation and the hypoxic environment within avascular tumors. Here we exploit these features to study the activation of DNA damage repair pathways and their correlation to developing hypoxia. Methods Activation of DNA damage repair markers, proliferation, cell death, glycogen accumulation and developing hypoxia were investigated using immunofluorescence, immuno-histochemistry, EdU incorporation, Western blots, COMET assays, and pharmacological agents in A673 Ewing sarcoma spheroids and monolayer cultures. Results DNA damage marker γ-H2AX is observed in the hypoxic, peri-necrotic region of growing spheroids. While most proliferating cells are seen on the spheroid surface, there are also a few Ki-67 positive cells in the hypoxic zone. The hypoxia-induced phosphorylation of H2AX to form γ-H2AX in spheroids is attenuated by the ATM inhibitor KU55933, but not the ATR inhibitor VE-821. Conclusion Tumor spheroids mimic tumor microenvironments such as the anoxic, hypoxic and oxic niches within solid tumors, as well as populations of cells that are viable, proliferating, and undergoing DNA damage repair processes under these different micro-environmental conditions. ATM, but not ATR, is the primary kinase responsible for γ-H2AX formation in the hypoxic core of A673 spheroids. Spheroids could offer unique advantages in testing therapeutics designed to target malignant cells that evade conventional treatment strategies by adapting to the hypoxic tumor microenvironment.
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Affiliation(s)
- Stephen Riffle
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH, 45229, USA
| | - Ram Naresh Pandey
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH, 45229, USA
| | - Morgan Albert
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH, 45229, USA
| | - Rashmi S Hegde
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH, 45229, USA.
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152
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Metabolic Portraits of Breast Cancer by HR MAS MR Spectroscopy of Intact Tissue Samples. Metabolites 2017; 7:metabo7020018. [PMID: 28509845 PMCID: PMC5487989 DOI: 10.3390/metabo7020018] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Revised: 04/20/2017] [Accepted: 05/09/2017] [Indexed: 12/17/2022] Open
Abstract
Despite progress in early detection and therapeutic strategies, breast cancer remains the second leading cause of cancer-related death among women globally. Due to the heterogeneity and complexity of tumor biology, breast cancer patients with similar diagnosis might have different prognosis and response to treatment. Thus, deeper understanding of individual tumor properties is necessary. Cancer cells must be able to convert nutrients to biomass while maintaining energy production, which requires reprogramming of central metabolic processes in the cells. This phenomenon is increasingly recognized as a potential target for treatment, but also as a source for biomarkers that can be used for prognosis, risk stratification and therapy monitoring. Magnetic resonance (MR) metabolomics is a widely used approach in translational research, aiming to identify clinically relevant metabolic biomarkers or generate novel understanding of the molecular biology in tumors. Ex vivo proton high-resolution magic angle spinning (HR MAS) MR spectroscopy is widely used to study central metabolic processes in a non-destructive manner. Here we review the current status for HR MAS MR spectroscopy findings in breast cancer in relation to glucose, amino acid and choline metabolism.
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153
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Padilha CS, Borges FH, Costa Mendes da Silva LE, Frajacomo FTT, Jordao AA, Duarte JA, Cecchini R, Guarnier FA, Deminice R. Resistance exercise attenuates skeletal muscle oxidative stress, systemic pro-inflammatory state, and cachexia in Walker-256 tumor-bearing rats. Appl Physiol Nutr Metab 2017; 42:916-923. [PMID: 28475846 DOI: 10.1139/apnm-2016-0436] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The aim of this study was to investigate the effects of resistance exercise training (RET) on oxidative stress, systemic inflammatory markers, and muscle wasting in Walker-256 tumor-bearing rats. Male (Wistar) rats were divided into 4 groups: sedentary controls (n = 9), tumor-bearing (n = 9), exercised (n = 9), and tumor-bearing exercised (n = 10). Exercised and tumor-bearing exercised rats were exposed to resistance exercise of climbing a ladder apparatus with weights tied to their tails for 6 weeks. The physical activity of control and tumor-bearing rats was confined to the space of the cage. After this period, tumor-bearing and tumor-bearing exercised animals were inoculated subcutaneously with Walker-256 tumor cells (11.0 × 107 cells in 0.5 mL of phosphate-buffered saline) while control and exercised rats were injected with vehicle. Following inoculation, rats maintained resistance exercise training (exercised and tumor-bearing exercised) or sedentary behavior (control and tumor-bearing) for 12 more days, after which they were euthanized. Results showed muscle wasting in the tumor-bearing group, with body weight loss, increased systemic leukocytes, and inflammatory interleukins as well as muscular oxidative stress and reduced mTOR signaling. In contrast, RET in the tumor-bearing exercised group was able to mitigate the reduced body weight and muscle wasting with the attenuation of muscle oxidative stress and systemic inflammatory markers. RET also prevented loss of muscle strength associated with tumor development. RET, however, did not prevent the muscle proteolysis signaling via FBXO32 gene messenger RNA expression in the tumor-bearing group. In conclusion, RET performed prior tumor implantation prevents cachexia development by attenuating tumor-induced systemic pro-inflammatory condition with muscle oxidative stress and muscle damage.
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Affiliation(s)
- Camila Souza Padilha
- a Department of Physical Education, Faculty of Physical Education and Sport, State University of Londrina, Londrina, PR, 86057-97, Brazil
| | - Fernando Henrique Borges
- b Laboratory of Pathophysiology of Skeletal Muscle Adaptations, State University of Londrina, Londrina, PR, 86057-97, Brazil
| | | | - Fernando Tadeu Trevisan Frajacomo
- a Department of Physical Education, Faculty of Physical Education and Sport, State University of Londrina, Londrina, PR, 86057-97, Brazil.,d Brazilian National Institute of Cancer (INCA), Rio de Janeiro, RJ, 20230-130, Brazil
| | - Alceu Afonso Jordao
- c Nutrition and Metabolism, Faculty of Medicine of Ribeirao Preto, University of Sao Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | | | - Rubens Cecchini
- b Laboratory of Pathophysiology of Skeletal Muscle Adaptations, State University of Londrina, Londrina, PR, 86057-97, Brazil
| | - Flávia Alessandra Guarnier
- b Laboratory of Pathophysiology of Skeletal Muscle Adaptations, State University of Londrina, Londrina, PR, 86057-97, Brazil
| | - Rafael Deminice
- a Department of Physical Education, Faculty of Physical Education and Sport, State University of Londrina, Londrina, PR, 86057-97, Brazil
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154
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Baldridge G, Higgins L, Witthuhn B, Markowski T, Baldridge A, Armien A, Fallon A. Proteomic analysis of a mosquito host cell response to persistent Wolbachia infection. Res Microbiol 2017; 168:609-625. [PMID: 28435138 DOI: 10.1016/j.resmic.2017.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 03/14/2017] [Accepted: 04/09/2017] [Indexed: 12/14/2022]
Abstract
Wolbachia pipientis, an obligate intracellular bacterium associated with arthropods and filarial worms, is a target for filarial disease treatment and provides a gene drive agent for insect vector population suppression/replacement. We compared proteomes of Aedes albopictus mosquito C/wStr1 cells persistently infected with Wolbachia strain wStr, relative to uninfected C7-10 control cells. Among approximately 2500 proteins, iTRAQ data identified 815 differentially abundant proteins. As functional classes, energy and central intermediary metabolism proteins were elevated in infected cells, while suppressed proteins with roles in host DNA replication, transcription and translation suggested that Wolbachia suppresses pathways that support host cell growth and proliferation. Vacuolar ATPase subunits were strongly elevated, consistent with high densities of Wolbachia contained individually within vacuoles. Other differential level proteins had roles in ROS neutralization, protein modification/degradation and signaling, including hypothetical proteins whose functions in Wolbachia infection can potentially be manipulated by RNAi interference or transfection. Detection of flavivirus proteins supports further analysis of poorly understood, insect-specific flaviviruses and their potential interactions with Wolbachia, particularly in mosquitoes transinfected with Wolbachia. This study provides a framework for future attempts to manipulate pathways in insect cell lines that favor production of Wolbachia for eventual genetic manipulation, transformation and transinfection of vector species.
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Affiliation(s)
- Gerald Baldridge
- Department of Entomology, University of Minnesota, 1980 Folwell Ave., St. Paul, MN 55108, USA.
| | - LeeAnn Higgins
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church St. SE, Minneapolis, MN 55455, USA.
| | - Bruce Witthuhn
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church St. SE, Minneapolis, MN 55455, USA.
| | - Todd Markowski
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church St. SE, Minneapolis, MN 55455, USA.
| | - Abigail Baldridge
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, 680 N. Lake Shore Drive, Chicago, IL 60611, USA.
| | - Anibal Armien
- Department of Veterinary Population Medicine, University of Minnesota, 1333 Gortner Ave., St. Paul, MN 55108, USA.
| | - Ann Fallon
- Department of Entomology, University of Minnesota, 1980 Folwell Ave., St. Paul, MN 55108, USA.
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155
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Khoury ZH, Bugshan A, Lubek JE, Papadimitriou JC, Basile JR, Younis RH. Glycogen-Rich Clear Cell Squamous Cell Carcinoma Originating in the Oral Cavity. Head Neck Pathol 2017; 11:552-560. [PMID: 28342060 PMCID: PMC5677064 DOI: 10.1007/s12105-017-0812-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Accepted: 03/20/2017] [Indexed: 12/19/2022]
Abstract
Clear cell squamous cell carcinoma (CCSCC) is a rare histological subtype of squamous cell carcinoma (SCC) that was originally described in the skin. Here, we report a case of a 66-year-old female patient who presented with a fungating ulcerative mass of the left lateral tongue extending anteriorly to the floor of the mouth, and posteriorly to the left retromolar fossa and the oropharynx. The patient had a history of SCC of the left posterior tongue that was treated with partial glossectomy and adjuvant radiotherapy. Representative biopsies were obtained from the floor of the mouth, tongue and retromolar fossa. The examined biopsies showed various degrees of dysplastic surface epithelium with transition into infiltrating epithelial tumor nests and cords with clear cytoplasm and malignant cellular features. Pancytokeratin, CK5/6, and p63 were all diffusely positive. S-100, Calponin, and smooth muscle actin (SMA) were negative. PAS stain was diffusely positive and diastase labile in the tumor clear cells. Sparse areas of mucicarmine positivity were noted. Based on these findings a final diagnosis of a glycogen-rich CCSCC was given. This case represents a very rare histological variant of oral SCC, which is significant for the histological differential diagnosis of clear cell tumors of the oral cavity.
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Affiliation(s)
- Zaid H. Khoury
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, 650 West Baltimore Street, 7th Floor North, Baltimore, MD 21201 USA
| | - Amr Bugshan
- Department of Diagnostic Sciences, School of Dental Medicine, Tufts University, Boston, MA 02111 USA ,Department of Biomedical Dental Science, Dental College, Dammam University, Dammam, Saudi Arabia
| | - Joshua E. Lubek
- Department of Oral and Maxillofacial Surgery, School of Dentistry, University of Maryland Baltimore, Baltimore, MD 21201 USA
| | - John C. Papadimitriou
- Department of Pathology, School of Medicine, University of Maryland Baltimore, Baltimore, MD 21201 USA
| | - John R. Basile
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, 650 West Baltimore Street, 7th Floor North, Baltimore, MD 21201 USA
| | - Rania H. Younis
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, 650 West Baltimore Street, 7th Floor North, Baltimore, MD 21201 USA
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156
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Naurecka ML, Sierakowski BM, Kasprzycka W, Dojs A, Dojs M, Suszyński Z, Kwaśny M. FTIR-ATR and FT-Raman Spectroscopy for Biochemical Changes in Oral Tissue. ACTA ACUST UNITED AC 2017. [DOI: 10.4236/ajac.2017.83015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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157
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Affiliation(s)
- Gregg L Semenza
- Institute for Cell Engineering, McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, 733 N. Broadway, Suite 671, Baltimore, MD, 21205, USA. .,Departments of Pediatrics, Medicine, Oncology, Radiation Oncology, and Biological Chemistry, Johns Hopkins University School of Medicine, 733 N. Broadway, Suite 671, Baltimore, MD, 21205, USA.
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158
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Metabolic synthetic lethality in cancer therapy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2016; 1858:723-731. [PMID: 27956047 DOI: 10.1016/j.bbabio.2016.12.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 11/23/2016] [Accepted: 12/05/2016] [Indexed: 12/20/2022]
Abstract
Our understanding of cancer has recently seen a major paradigm shift resulting in it being viewed as a metabolic disorder, and altered cellular metabolism being recognised as a hallmark of cancer. This concept was spurred by the findings that the oncogenic mutations driving tumorigenesis induce a reprogramming of cancer cell metabolism that is required for unrestrained growth and proliferation. The recent discovery that mutations in key mitochondrial enzymes play a causal role in tumorigenesis suggested that dysregulation of metabolism could also be a driver of tumorigenesis. These mutations induce profound adaptive metabolic alterations that are a prerequisite for the survival of the mutated cells. Because these metabolic events are specific to cancer cells, they offer an opportunity to develop new therapies that specifically target tumour cells without affecting healthy tissue. Here, we will describe recent developments in metabolism-based cancer therapy, in particular focusing on the concept of metabolic synthetic lethality. This article is part of a Special Issue entitled Mitochondria in Cancer, edited by Giuseppe Gasparre, Rodrigue Rossignol and Pierre Sonveaux.
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159
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Mathieu C, Dupret JM, Rodrigues Lima F. The structure of brain glycogen phosphorylase-from allosteric regulation mechanisms to clinical perspectives. FEBS J 2016; 284:546-554. [PMID: 27782369 DOI: 10.1111/febs.13937] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 10/13/2016] [Accepted: 10/24/2016] [Indexed: 01/15/2023]
Abstract
Glycogen phosphorylase (GP) is the key enzyme that regulates glycogen mobilization in cells. GP is a complex allosteric enzyme that comprises a family of three isozymes: muscle GP (mGP), liver GP (lGP), and brain GP (bGP). Although the three isozymes display high similarity and catalyze the same reaction, they differ in their sensitivity to the allosteric activator adenosine monophosphate (AMP). Moreover, inactivating mutations in mGP and lGP have been known to be associated with glycogen storage diseases (McArdle and Hers disease, respectively). The determination, decades ago, of the structure of mGP and lGP have allowed to better understand the allosteric regulation of these two isoforms and the development of specific inhibitors. Despite its important role in brain glycogen metabolism, the structure of the brain GP had remained elusive. Here, we provide an overview of the human brain GP structure and its relationship with the two other members of this key family of the metabolic enzymes. We also summarize how this structure provides valuable information to understand the regulation of bGP and to design specific ligands of potential pharmacological interest.
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Affiliation(s)
- Cécile Mathieu
- Sorbonne Paris Cité, Unité BFA, CNRS UMR 8251, Université Paris Diderot, France
| | - Jean-Marie Dupret
- Sorbonne Paris Cité, Unité BFA, CNRS UMR 8251, Université Paris Diderot, France.,UFR Sciences du Vivant, Université Paris Diderot, France
| | - Fernando Rodrigues Lima
- Sorbonne Paris Cité, Unité BFA, CNRS UMR 8251, Université Paris Diderot, France.,UFR Sciences du Vivant, Université Paris Diderot, France
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160
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Kantsadi AL, Bokor É, Kun S, Stravodimos GA, Chatzileontiadou DS, Leonidas DD, Juhász-Tóth É, Szakács A, Batta G, Docsa T, Gergely P, Somsák L. Synthetic, enzyme kinetic, and protein crystallographic studies of C -β- d -glucopyranosyl pyrroles and imidazoles reveal and explain low nanomolar inhibition of human liver glycogen phosphorylase. Eur J Med Chem 2016; 123:737-745. [DOI: 10.1016/j.ejmech.2016.06.049] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 06/19/2016] [Accepted: 06/28/2016] [Indexed: 10/21/2022]
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