1
|
Alshehri B. Prognostic significance and expression pattern of glucose related genes in breast cancer: A comprehensive computational biology approach. Saudi J Biol Sci 2024; 31:103896. [PMID: 38173442 PMCID: PMC10761912 DOI: 10.1016/j.sjbs.2023.103896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 11/26/2023] [Accepted: 12/01/2023] [Indexed: 01/05/2024] Open
Abstract
Breast cancer (BC) is the most common type of malignancy globally and the main reason why women die from tumours. The Warburg effect, a characteristic of tumor, describes how most solid tumour cells acclimatize to their diverse surroundings by relying heavily on aerobic glycolysis for production of energy. In addition to producing key metabolic intermediates that are crucial for the production of macromolecules, which enable cancer cell division, invasiveness, and drug resistance, the transformed energy metabolism also supplies tumor cells with ATP for cellular energy. Here, we evaluated the expression profile, prognostic significance, and clinical relevance of glucose-related genes in BC using a bioinformatic approach. To clarify the significance of glucose-related genes in the development of breast tumours, we also performed a functional enrichment investigation of deregulated genes using the STRING and KEGG portal. The study depicted that of the 61 genes examined, 8 genes had a fold change =± 1.5, that is, ADH1C, ADH4, ALDH1A3, ALDOC, FBP1, PCK1, PFKFB1, PFKFB3. Among the highly deregulated genes, ADH1C showed a fold change of -6.669. These deregulated genes were associated with poor prognosis. The study signifies that glucose related genes are highly dysregulated in breast cancer. Deregulation of glucose related genes is linked with a poor prognosis in BC individuals. Thus, targeting glucose related genes will provide an effective treatment approach for BC individuals.
Collapse
Affiliation(s)
- Bader Alshehri
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, Majmaah University, Almajmaah 11952, Saudi Arabia
| |
Collapse
|
2
|
Kang SH, Choi JS. MicroRNA-765 is upregulated in myelodysplastic syndromes and induces apoptosis via PLP2 inhibition in leukemia cells. Blood Res 2023; 58:133-137. [PMID: 37495419 PMCID: PMC10548289 DOI: 10.5045/br.2023.2023097] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 07/19/2023] [Accepted: 07/21/2023] [Indexed: 07/28/2023] Open
Abstract
Background Epigenetic studies, particularly research on microRNA (miRNA), have flourished. The abnormal expression of miRNA contributes to the development of hematologic malignancies. miR-765 has been reported to inhibit cell proliferation by downregulating proteolipid protein 2 (PLP2), which causes apoptosis. We investigated miR-765 dysregulation in myelodysplastic syndromes (MDS). Methods We compared the expression profiles of miR-765 in 65 patients with MDS and 11 controls. Cell proliferation and apoptosis assays were performed to determine the in vitro effects of miR-765 on leukemia cells transfected with the miR-765 mimic. Reverse transcription quantitative PCR (RT-qPCR) and western blotting were performed to examine the targets of miR-765. Results We found that miR-765 levels were upregulated 10.2-fold in patients with MDS compared to controls. In refractory cytopenia with multilineage dysplasia, the percentage of patients with elevated miR-765 levels was significantly higher than in other forms of MDS. Experiments with leukemia cells revealed that transfection with a miR-765 mimic inhibited cell proliferation and induced apoptosis. RT-qPCR and western blotting demonstrated that the target of miR-765 was PLP2. Conclusion These findings imply that upregulation of miR-765 induces apoptosis via downregulation of PLP2 and may have a role in MDS pathogenesis.
Collapse
Affiliation(s)
- Seong-Ho Kang
- Department of Laboratory Medicine, Chosun University College of Medicine, Gwangju, Korea
| | - Ji Seon Choi
- Department of Laboratory Medicine, International St. Mary’s Hospital, Catholic Kwandong University, Incheon, Korea
| |
Collapse
|
3
|
Chandrasekar SA, Palaniyandi T, Parthasarathy U, Surendran H, Viswanathan S, Wahab MRA, Baskar G, Natarajan S, Ranjan K. Implications of Toll-like receptors (TLRs) and their signaling mechanisms in human cancers. Pathol Res Pract 2023; 248:154673. [PMID: 37453359 DOI: 10.1016/j.prp.2023.154673] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 07/02/2023] [Accepted: 07/03/2023] [Indexed: 07/18/2023]
Abstract
Most essential pattern-recognition receptors regulating innate immune functions are toll-like receptors (TLRs). TLRs are characterized by lack of concurrent epithelial markers and are typically identified by their gene expressions. One major mechanism by which TLRs generate their effector functions is by triggering inflammatory responses. Activation of TLRs can impact initiation, advancement, and control of cancers by regulating the inflammatory microenvironment. Several TLRs have been implicated in human cancers and some of them are identified as cancer biomarkers as well; for example, TLRs 2, 3, 5 are expressed more frequently in most cancers. Knowing the upregulation and downregulation of the TLR genes in human cancers will be useful for the development of newer therapeutic targets which can disrupt the pathways associated with such deregulation. We present here the various TLRs and their functions in human lung, gastric, breast, prostate, oral, ovarian, colorectal, cervical, esophageal, bladder and hepatic cancers.
Collapse
Affiliation(s)
- Saran Aravinda Chandrasekar
- Department of Biotechnology, Dr.MGR Educational and Research Institute, Maduravoyal, Chennai, Tamil Nadu, India; Department of Biomedical, School of Electronics Engineering (SENSE), VIT(Vellore Institute of Technology), Vellore 632014, India
| | - Thirunavukkarasu Palaniyandi
- Department of Biotechnology, Dr.MGR Educational and Research Institute, Maduravoyal, Chennai, Tamil Nadu, India; Department of Anatomy, Biomedical Research Unit and Laboratory Animal Centre, Saveetha Dental College and Hospital, SIMATS, Saveetha University, Chennai, India.
| | - Udhayakumar Parthasarathy
- Department of Biotechnology, Dr.MGR Educational and Research Institute, Maduravoyal, Chennai, Tamil Nadu, India
| | - Hemapreethi Surendran
- Department of Biotechnology, Dr.MGR Educational and Research Institute, Maduravoyal, Chennai, Tamil Nadu, India
| | - Sandhiya Viswanathan
- Department of Biotechnology, Dr.MGR Educational and Research Institute, Maduravoyal, Chennai, Tamil Nadu, India
| | - Mugip Rahaman Abdul Wahab
- Department of Biotechnology, Dr.MGR Educational and Research Institute, Maduravoyal, Chennai, Tamil Nadu, India
| | - Gomathy Baskar
- Department of Biotechnology, Dr.MGR Educational and Research Institute, Maduravoyal, Chennai, Tamil Nadu, India
| | - Sudhakar Natarajan
- Department of virology and Biotechnology, ICMR-National Institute for Research in Tuberculosis (NIRT), Chetpet, Chennai 600031, Tamil Nadu, India
| | - Kishu Ranjan
- Department of Pathology, School of Medicine, Yale University, New Haven 06520, USA
| |
Collapse
|
4
|
Sattar RSA, Sumi MP, Nimisha, Apurva, Kumar A, Sharma AK, Ahmad E, Ali A, Mahajan B, Saluja SS. S1P signaling, its interactions and cross-talks with other partners and therapeutic importance in colorectal cancer. Cell Signal 2021; 86:110080. [PMID: 34245863 DOI: 10.1016/j.cellsig.2021.110080] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 06/25/2021] [Accepted: 07/05/2021] [Indexed: 02/07/2023]
Abstract
Sphingosine-1-Phosphate (S1P) plays an important role in normal physiology, inflammation, initiation and progression of cancer. Deregulation of S1P signaling causes aberrant proliferation, affects survival, leads to angiogenesis and metastasis. Sphingolipid rheostat is crucial for cellular homeostasis. Discrepancy in sphingolipid metabolism is linked to cancer and drug insensitivity. Owing to these diverse functions and being a potent mediator of tumor growth, S1P signaling might be a suitable candidate for anti-tumor therapy or combination therapy. In this review, with a focus on colorectal cancer we have summarized the interacting partners of S1P signaling pathway, its therapeutic approaches along with the contribution of S1P signaling to various cancer hallmarks.
Collapse
Affiliation(s)
- Real Sumayya Abdul Sattar
- Central Molecular Laboratory, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India
| | - Mamta P Sumi
- Central Molecular Laboratory, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India
| | - Nimisha
- Central Molecular Laboratory, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India
| | - Apurva
- Central Molecular Laboratory, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India
| | - Arun Kumar
- Central Molecular Laboratory, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India
| | - Abhay Kumar Sharma
- Central Molecular Laboratory, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India
| | - Ejaj Ahmad
- Central Molecular Laboratory, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India
| | - Asgar Ali
- Department of Biochemistry, All India Institute of Medical Science (AIIMS), Patna, Bihar, India
| | - Bhawna Mahajan
- Central Molecular Laboratory, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India; Department of Biochemistry, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India
| | - Sundeep Singh Saluja
- Central Molecular Laboratory, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India; Department of GI Surgery, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India.
| |
Collapse
|
5
|
Olujobi OJ. Deregulation of the downstream petroleum industry: An overview of the legal quandaries and proposal for improvement in Nigeria. Heliyon 2021; 7:e06848. [PMID: 33997390 PMCID: PMC8095105 DOI: 10.1016/j.heliyon.2021.e06848] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 03/04/2021] [Accepted: 04/14/2021] [Indexed: 11/24/2022] Open
Abstract
The study investigates the necessity for deregulation of the downstream petroleum sector to tackles shortfalls and to enhance quantities of petroleum commodities in Nigeria. The objective is to boost proficiency in the industry via governance, statutory transformations and vigorous business competition by learning from other advanced countries' skills to transform and fortify the downstream oil industry laws. The study embraces a conceptual legal approach utilising existing literature to aid a doctrinal legal study technique. The research also utilizes primary and secondary founts of legislations, such as, constitutional and case laws. The finding of the research is the absolute authority of the government in the industry and incongruous valuing of oil commodities which made the industry unappealing to financiers to found private refineries that will ensure adequate supply of petroleum and reasonable profits on their investments owing to excessive regulation of the industry by the government. The study designed a model to halt continuous increment in the fuel price and to ensure efficient downstream petroleum industry. The study concludes with the recommendations, for instance, the necessity of high-tech fusion of policies and encouragements for investment in the downstream to boosts swift enactment of the awaiting Petroleum Industry Governance Bill 2017 and absolute deregulation of the industry to foster private investments and to halt subsidy disbursements being a new fountain of corruption.
Collapse
|
6
|
Zarka KA, Hokanson K, Douches DS. Molecular characterization for food safety assessment of a genetically modified late blight resistant potato: an unusual case. Transgenic Res 2021; 30:169-183. [PMID: 33751337 DOI: 10.1007/s11248-021-00241-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 03/11/2021] [Indexed: 10/21/2022]
Abstract
Standard food safety assessments of genetically modified crops require a thorough molecular characterization of the novel DNA as inserted into the plant that is intended for commercialization, as well as a comparison of agronomic and nutritional characteristics of the genetically modified to the non-modified counterpart. These characterization data are used to identify any unintended changes in the inserted DNA or in the modified plant that would require assessment for safety in addition to the assessment of the intended modification. An unusual case of an unintended effect discovered from the molecular characterization of a genetically modified late blight resistant potato developed for growing in Bangladesh and Indonesia is presented here. Not only was a significant portion of the plasmid vector backbone DNA inserted into the plant along with the intended insertion of an R-gene for late blight resistance, but the inserted DNA was split into two separate fragments and inserted into two separate chromosomes. One fragment carries the R-gene and the other fragment carries the NPTII selectable marker gene and the plasmid backbone DNA. The implications of this for the food safety assessment of this late blight resistant potato are considered.
Collapse
Affiliation(s)
- Kelly A Zarka
- Department of Plant, Soil and Microbial Sciences, Molecular Plant Science Bldg, Michigan State University, East Lansing, MI, USA.
| | - Karen Hokanson
- Department of Horticultural Science, University of Minnesota, St. Paul, MN, USA
| | - David S Douches
- Department of Plant, Soil and Microbial Sciences, Molecular Plant Science Bldg, Michigan State University, East Lansing, MI, USA
| |
Collapse
|
7
|
Vale MM, Berenguer E, Argollo de Menezes M, Viveiros de Castro EB, Pugliese de Siqueira L, Portela RDCQ. The COVID-19 pandemic as an opportunity to weaken environmental protection in Brazil. Biol Conserv 2021; 255:108994. [PMID: 33568834 PMCID: PMC7862926 DOI: 10.1016/j.biocon.2021.108994] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 01/08/2021] [Accepted: 01/16/2021] [Indexed: 05/25/2023]
Abstract
This paper examines the effects of the COVID-19 pandemic on environmental protection and legislation in Brazil. We evaluate major legislative actions, environmental fines and deforestation since January 2019. We show that 57 legislative acts aimed at weakening environmental protection in Brazil during the current administration, almost half of which in the seven-month period of the pandemic in Brazil, with September 2020 as the month with the most legislative acts (n = 16). These acts either deregulated or weakened current environmental legislation, with a number of them aimed at dismantling the main federal institutions in charge of environmental protection. We also found a 72% reduction in environmental fines during the pandemic, despite an increase in Amazonian deforestation during this period. We conclude that the current administration is taking advantage of the COVID-19 pandemic to intensify a pattern of weakening environmental protection in Brazil. This has the potential to intensify ongoing loss of biodiversity, greenhouse gas emissions, and the likelihood of other zoonotic disease outbreaks, and inflict substantial harm to traditional and indigenous peoples. We highlight the key role of the scientific community, media and civil society, national and international levels, in order to reverse these harmful actions.
Collapse
Affiliation(s)
- Mariana M Vale
- Ecology Department, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
- National Institute of Science and Technology on Ecology, Evolution and Biodiversity Conservation, Goiania, GO 74690-900, Brazil
- Board of Trustees, Tijuca National Park, Rio de Janeiro, RJ 22241-330, Brazil
| | - Erika Berenguer
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, OX1 3QY Oxford, UK
- Lancaster Environment Centre, Lancaster University, LA1 4YQ Lancaster, UK
| | | | | | | | - Rita de Cássia Q Portela
- Ecology Department, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
- Board of Trustees, Poço das Antas Biological Reserve, Silva Jardim, RJ 28820-000, Brazil
| |
Collapse
|
8
|
Gallone EL, Ravetto Enri L, Pignata I, Baratta F, Brusa P. The 2017 deregulation of pharmacies in Italy: Introducing non-pharmacist ownership. Health Policy 2020; 124:1281-1286. [PMID: 32994057 DOI: 10.1016/j.healthpol.2020.08.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 05/26/2020] [Accepted: 08/31/2020] [Indexed: 12/01/2022]
Abstract
Italy is the last European country to adopt policies on the liberalization of pharmacy ownership. In August 2017, the Italian government approved the law n. 124 (annual market and competition law), despite the opposition of some stakeholders. This law extended the ownership of pharmacies to non-pharmacist business partners. Law n. 124 is an important turning point for pharmacists in Italy and could lead to a general reorganization of the Italian pharmaceutical system. As has already happened in several European countries, the removal of barriers to pharmacy ownership incentivizes finance companies and pharmaceutical wholesalers to make significant investments in this sector, leading to the emergence of commercial pharmacy chains. The future of community pharmacies is uncertain and is closely linked to the fate of the current government. However, progressive polarization between independent pharmacies and pharmacies that are part of chains can already be observed.
Collapse
Affiliation(s)
| | | | - Irene Pignata
- Department of Drug Science and Technology, University of Turin, Turin, Italy
| | - Francesca Baratta
- Department of Drug Science and Technology, University of Turin, Turin, Italy
| | - Paola Brusa
- Department of Drug Science and Technology, University of Turin, Turin, Italy.
| |
Collapse
|
9
|
Cserhalmi M, Papp A, Brandus B, Uzonyi B, Józsi M. Regulation of regulators: Role of the complement factor H-related proteins. Semin Immunol 2019; 45:101341. [PMID: 31757608 DOI: 10.1016/j.smim.2019.101341] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 10/07/2019] [Accepted: 10/24/2019] [Indexed: 01/15/2023]
Abstract
The complement system, while being an essential and very efficient effector component of innate immunity, may cause damage to the host and result in various inflammatory, autoimmune and infectious diseases or cancer, when it is improperly activated or regulated. Factor H is a serum glycoprotein and the main regulator of the activity of the alternative complement pathway. Factor H, together with its splice variant factor H-like protein 1 (FHL-1), inhibits complement activation at the level of the central complement component C3 and beyond. In humans, there are also five factor H-related (FHR) proteins, whose function is poorly characterized. While data indicate complement inhibiting activity for some of the FHRs, there is increasing evidence that FHRs have an opposite role compared with factor H and FHL-1, namely, they enhance complement activation directly and also by competing with the regulators FH and FHL-1. This review summarizes the current stand and recent data on the roles of factor H family proteins in health and disease, with focus on the function of FHR proteins.
Collapse
|
10
|
Barbarisi I, Bruno G, Diglio A, Elizalde J, Piccolo C. A spatial analysis to evaluate the impact of deregulation policies in the pharmacy sector: Evidence from the case of Navarre. Health Policy 2019; 123:1108-1115. [PMID: 31470985 DOI: 10.1016/j.healthpol.2019.08.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 07/23/2019] [Accepted: 08/18/2019] [Indexed: 11/28/2022]
Abstract
Community pharmacies represent unusual enterprises as their main function is intrinsically related to the provision of healthcare services. Hence, market competition in this sector needs to be regulated, in order to ensure equitable accessibility, efficiency and quality of services. However, recently a general deregulation trend may be observed in Europe. In this paper, we focus on location restrictions, i.e. on demographic and geographic constraints to open new pharmacies, and we evaluate the impact of their relaxation. In particular, we analyze the case of the city of Pamplona (ES), where a striking increase in the number of pharmacies occurred, after the introduction of a new regulatory system in 2000. We evaluate, thanks to an in-depth spatial analysis, the evolution of the system to date and the effects produced on the consumers, in terms of accessibility, and on the competitors, in terms of market shares distribution. By comparing the obtained results with the ones related to the case of a second Spanish city, characterized by more strict restrictions, it emerges that the deregulation risks to produce a limited improvement in terms of accessibility and to exacerbate differences among consumers. Moreover, an increasing number of competitors does not necessarily imply a more equitable distribution of market shares, thus putting at risk the desired effects in terms of cost reduction and service quality improvement.
Collapse
Affiliation(s)
- Ilaria Barbarisi
- Dipartimento di Ingegneria Industriale (DII), Università degli Studi di Napoli Federico II, P.le Tecchio 80, 80125 Napoli, Italy.
| | - Giuseppe Bruno
- Dipartimento di Ingegneria Industriale (DII), Università degli Studi di Napoli Federico II, P.le Tecchio 80, 80125 Napoli, Italy.
| | - Antonio Diglio
- Dipartimento di Ingegneria Industriale (DII), Università degli Studi di Napoli Federico II, P.le Tecchio 80, 80125 Napoli, Italy.
| | - Javier Elizalde
- Facultad de Ciencias Económicas y Empresariales, Universidad de Navarra, Campus Universitario, 31080 Pamplona, Spain.
| | - Carmela Piccolo
- Dipartimento di Ingegneria Industriale (DII), Università degli Studi di Napoli Federico II, P.le Tecchio 80, 80125 Napoli, Italy.
| |
Collapse
|
11
|
Affiliation(s)
- Fabian Grütter
- ETH Zürich, Professur für Wissenschaftsforschung, Clausiusstr. 59, CH-8092, Zürich
| | - Nils Güttler
- ETH Zürich, Professur für Wissenschaftsforschung, Clausiusstr. 59, CH-8092, Zürich
| | - Max Stadler
- ETH Zürich, Professur für Wissenschaftsforschung, Clausiusstr. 59, CH-8092, Zürich
| | - Monika Wulz
- ETH Zürich, Professur für Wissenschaftsforschung, Clausiusstr. 59, CH-8092, Zürich
| |
Collapse
|
12
|
Celhay O, Bousset L, Guy L, Kemeny JL, Leoni V, Caccia C, Trousson A, Damon-Soubeyrant C, De Haze A, Sabourin L, Godfraind C, de Joussineau C, Pereira B, Morel L, Lobaccaro JM, Baron S. Individual Comparison of Cholesterol Metabolism in Normal and Tumour Areas in Radical Prostatectomy Specimens from Patients with Prostate Cancer: Results of the CHOMECAP Study. Eur Urol Oncol 2018; 2:198-206. [PMID: 31017097 DOI: 10.1016/j.euo.2018.08.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 07/13/2018] [Accepted: 08/01/2018] [Indexed: 11/16/2022]
Abstract
BACKGROUND Deregulation of cholesterol metabolism represents a hallmark of prostate cancer (PCa) and promotes its development. OBJECTIVE To compare cholesterol metabolism on individual paired normal and tumour prostate tissues obtained from patients with PCa. DESIGN, SETTING, AND PARTICIPANTS Between 2008 and 2012, normal and tumour paired tissue samples were collected from radical prostatectomy specimens from a cohort of 69 patients treated for localised PCa. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS Tumour and normal tissues were subjected to gene analysis, sterol measurement, and immunohistochemistry. The Wilcoxon paired test and Spearman test were applied for comparison and correlation analyses, respectively. Principal component analysis was also carried out to investigate relationships between quantitative variables. RESULTS AND LIMITATIONS Overall, cholesterol concentrations were not significantly different between tissue pairs. However, tumour samples were significantly associated with downregulated de novo cholesterol synthesis, but exhibited 54.7% overexpression of SCARB1 that could increase high-density lipoprotein uptake in PCa. Tumour tissues showed different trafficking of available cholesterol, with significantly lower ACAT1, and an altered efflux via APOE. Furthermore, cholesterol metabolism in tumour tissues was characterised by higher accumulation of 7α-hydroxycholesterol (OHC), 7βOHC, and 7-ketosterol, and a lower level of 27OHC. CONCLUSIONS Focusing on individually paired prostate tissues, our results highlighted several differences between normal and tumour samples linked to a metabolic shift in cholesterol flux. PCa samples exhibited a specific tissue signature characterised by higher SCARB1 expression, higher accumulation of OHC species, and clear downregulation of de novo cholesterol synthesis. PATIENT SUMMARY Comparing normal and tumour tissues from the same prostates, our study identified a set of alterations in prostate cancer samples in terms of their use of cholesterol. These included higher cholesterol uptake, accumulation of oxidised cholesterol derivatives, and autonomous cellular production of cholesterol. Together, these data provide promising clinical targets to fight prostate cancer.
Collapse
Affiliation(s)
- Olivier Celhay
- Laboratoire Génétique, Reproduction et Développement, Université Clermont Auvergne, Clermont-Ferrand, France; Centre de Recherche en Nutrition Humaine d'Auvergne, Clermont-Ferrand, France; Urologie Bordeaux Saint-Gatien, Clinique Tivoli-Ducos, Bordeaux, France; Service d'Urologie, Centre Hospitalier Universitaire de Clermont-Ferrand, Clermont-Ferrand, France
| | - Laura Bousset
- Laboratoire Génétique, Reproduction et Développement, Université Clermont Auvergne, Clermont-Ferrand, France; Centre de Recherche en Nutrition Humaine d'Auvergne, Clermont-Ferrand, France
| | - Laurent Guy
- Service d'Urologie, Centre Hospitalier Universitaire de Clermont-Ferrand, Clermont-Ferrand, France
| | - Jean-Louis Kemeny
- Service d'Anatomie Pathologique, Centre Hospitalier Universitaire de Clermont-Ferrand, Clermont-Ferrand, France
| | - Valerio Leoni
- Laboratory of Clinical Chemistry, Hospital of Varese, ASST-Settelaghi, Varese, Italy
| | - Claudio Caccia
- Laboratory of Clinical Chemistry, Hospital of Varese, ASST-Settelaghi, Varese, Italy
| | - Amalia Trousson
- Laboratoire Génétique, Reproduction et Développement, Université Clermont Auvergne, Clermont-Ferrand, France; Centre de Recherche en Nutrition Humaine d'Auvergne, Clermont-Ferrand, France
| | - Christelle Damon-Soubeyrant
- Laboratoire Génétique, Reproduction et Développement, Université Clermont Auvergne, Clermont-Ferrand, France; Centre de Recherche en Nutrition Humaine d'Auvergne, Clermont-Ferrand, France
| | - Angélique De Haze
- Laboratoire Génétique, Reproduction et Développement, Université Clermont Auvergne, Clermont-Ferrand, France; Centre de Recherche en Nutrition Humaine d'Auvergne, Clermont-Ferrand, France
| | - Laura Sabourin
- Urologie Bordeaux Saint-Gatien, Clinique Tivoli-Ducos, Bordeaux, France
| | - Catherine Godfraind
- Service d'Anatomie Pathologique, Centre Hospitalier Universitaire de Clermont-Ferrand, Clermont-Ferrand, France
| | - Cyrille de Joussineau
- Laboratoire Génétique, Reproduction et Développement, Université Clermont Auvergne, Clermont-Ferrand, France; Centre de Recherche en Nutrition Humaine d'Auvergne, Clermont-Ferrand, France
| | - Bruno Pereira
- Unité de biostatistiques, Centre Hospitalier Universitaire de Clermont-Ferrand, Clermont-Ferrand, France
| | - Laurent Morel
- Laboratoire Génétique, Reproduction et Développement, Université Clermont Auvergne, Clermont-Ferrand, France; Centre de Recherche en Nutrition Humaine d'Auvergne, Clermont-Ferrand, France
| | - Jean Marc Lobaccaro
- Laboratoire Génétique, Reproduction et Développement, Université Clermont Auvergne, Clermont-Ferrand, France; Centre de Recherche en Nutrition Humaine d'Auvergne, Clermont-Ferrand, France
| | - Silvère Baron
- Laboratoire Génétique, Reproduction et Développement, Université Clermont Auvergne, Clermont-Ferrand, France; Centre de Recherche en Nutrition Humaine d'Auvergne, Clermont-Ferrand, France.
| |
Collapse
|
13
|
Cress BF, Leitz QD, Kim DC, Amore TD, Suzuki JY, Linhardt RJ, Koffas MAG. CRISPRi-mediated metabolic engineering of E. coli for O-methylated anthocyanin production. Microb Cell Fact 2017; 16:10. [PMID: 28095853 PMCID: PMC5240198 DOI: 10.1186/s12934-016-0623-3] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 12/27/2016] [Indexed: 12/27/2022] Open
Abstract
Background Anthocyanins are a class of brightly colored, glycosylated flavonoid pigments that imbue their flower and fruit host tissues with hues of predominantly red, orange, purple, and blue. Although all anthocyanins exhibit pH-responsive photochemical changes, distinct structural decorations on the core anthocyanin skeleton also cause dramatic color shifts, in addition to improved stabilities and unique pharmacological properties. In this work, we report for the first time the extension of the reconstituted plant anthocyanin pathway from (+)-catechin to O-methylated anthocyanins in a microbial production system, an effort which requires simultaneous co-option of the endogenous metabolites UDP-glucose and S-adenosyl-l-methionine (SAM or AdoMet). Results Anthocyanin O-methyltransferase (AOMT) orthologs from various plant sources were co-expressed in Escherichia coli with Petunia hybrida anthocyanidin synthase (PhANS) and Arabidopsis thaliana anthocyanidin 3-O-glucosyltransferase (At3GT). Vitis vinifera AOMT (VvAOMT1) and fragrant cyclamen ‘Kaori-no-mai’ AOMT (CkmOMT2) were found to be the most effective AOMTs for production of the 3′-O-methylated product peonidin 3-O-glucoside (P3G), attaining the highest titers at 2.4 and 2.7 mg/L, respectively. Following modulation of plasmid copy number and optimization of VvAOMT1 and CkmOMT2 expression conditions, production was further improved to 23 mg/L using VvAOMT1. Finally, CRISPRi was utilized to silence the transcriptional repressor MetJ in order to deregulate the methionine biosynthetic pathway and improve SAM availability for O-methylation of cyanidin 3-O-glucoside (C3G), the biosynthetic precursor to P3G. MetJ repression led to a final titer of 51 mg/L (56 mg/L upon scale-up to shake flask), representing a twofold improvement over the non-targeting CRISPRi control strain and 21-fold improvement overall. Conclusions An E. coli strain was engineered for production of the specialty anthocyanin P3G using the abundant and comparatively inexpensive flavonol precursor, (+)-catechin. Furthermore, dCas9-mediated transcriptional repression of metJ alleviated a limiting SAM pool size, enhancing titers of the methylated anthocyanin product. While microbial production of P3G and other O-methylated anthocyanin pigments will likely be valuable to the food industry as natural food and beverage colorants, we expect that the strain constructed here will also prove useful to the ornamental plant industry as a platform for evaluating putative anthocyanin O-methyltransferases in pursuit of bespoke flower pigment compositions. Electronic supplementary material The online version of this article (doi:10.1186/s12934-016-0623-3) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Brady F Cress
- Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Biotech 4005D, 110 8th Street, Troy, NY, 12180, USA
| | - Quentin D Leitz
- Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Biotech 4005D, 110 8th Street, Troy, NY, 12180, USA
| | - Daniel C Kim
- Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Biotech 4005D, 110 8th Street, Troy, NY, 12180, USA
| | - Teresita D Amore
- Department of Tropical Plant and Soil Sciences, University of Hawaii, 3190 Maile Way, Honolulu, HI, 96822, USA
| | - Jon Y Suzuki
- U.S. Department of Agriculture, Agricultural Research Service, Daniel K. Inouye U.S. Pacific Basin Agricultural Research Center, Hilo, HI, 96720, USA
| | - Robert J Linhardt
- Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Biotech 4005D, 110 8th Street, Troy, NY, 12180, USA.,Department of Biological Sciences, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA.,Department of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Mattheos A G Koffas
- Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Biotech 4005D, 110 8th Street, Troy, NY, 12180, USA. .,Department of Biological Sciences, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA.
| |
Collapse
|
14
|
Kunjapur AM, Hyun JC, Prather KLJ. Deregulation of S-adenosylmethionine biosynthesis and regeneration improves methylation in the E. coli de novo vanillin biosynthesis pathway. Microb Cell Fact 2016; 15:61. [PMID: 27067813 PMCID: PMC4828866 DOI: 10.1186/s12934-016-0459-x] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 03/28/2016] [Indexed: 12/31/2022] Open
Abstract
Background Vanillin is an industrially valuable molecule that can be produced from simple carbon sources in engineered microorganisms such as Saccharomyces cerevisiae and Escherichia coli. In E. coli, de novo production of vanillin was demonstrated previously as a proof of concept. In this study, a series of data-driven experiments were performed in order to better understand limitations associated with biosynthesis of vanillate, which is the immediate precursor to vanillin. Results Time-course experiments monitoring production of heterologous metabolites in the E. coli de novo vanillin pathway revealed a bottleneck in conversion of protocatechuate to vanillate. Perturbations in central metabolism intended to increase flux into the heterologous pathway increased average vanillate titers from 132 to 205 mg/L, but protocatechuate remained the dominant heterologous product on a molar basis. SDS-PAGE, in vitro activity measurements, and l-methionine supplementation experiments suggested that the decline in conversion rate was influenced more by limited availability of the co-substrate S-adenosyl-l-methionine (AdoMet or SAM) than by loss of activity of the heterologous O-methyltransferase. The combination of metJ deletion and overexpression of feedback-resistant variants of metA and cysE, which encode enzymes involved in SAM biosynthesis, increased average de novo vanillate titers by an additional 33 % (from 205 to 272 mg/L). An orthogonal strategy intended to improve SAM regeneration through overexpression of native mtn and luxS genes resulted in a 25 % increase in average de novo vanillate titers (from 205 to 256 mg/L). Vanillate production improved further upon supplementation with methionine (as high as 419 ± 58 mg/L), suggesting potential for additional enhancement by increasing SAM availability. Conclusions Results from this study demonstrate context dependency of engineered pathways and highlight the limited methylation capacity of E. coli. Unlike in previous efforts to improve SAM or methionine biosynthesis, we pursued two orthogonal strategies that are each aimed at deregulating multiple reactions. Our results increase the working knowledge of SAM biosynthesis engineering and provide a framework for improving titers of metabolic products dependent upon methylation reactions. Electronic supplementary material The online version of this article (doi:10.1186/s12934-016-0459-x) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Aditya M Kunjapur
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room E17-504G, Cambridge, MA, 02139, USA.,Synthetic Biology Engineering Research Center (SynBERC), Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.,Department of Genetics, Harvard Medical School, Boston, MA, 02115, USA
| | - Jason C Hyun
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room E17-504G, Cambridge, MA, 02139, USA.,Synthetic Biology Engineering Research Center (SynBERC), Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Kristala L J Prather
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room E17-504G, Cambridge, MA, 02139, USA. .,Synthetic Biology Engineering Research Center (SynBERC), Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
| |
Collapse
|
15
|
Håkonsen H, Sundell KA, Martinsson J, Hedenrud T. Consumer preferences for over-the-counter drug retailers in the reregulated Swedish pharmacy market. Health Policy 2016; 120:327-33. [PMID: 26861972 DOI: 10.1016/j.healthpol.2016.01.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 12/17/2015] [Accepted: 01/13/2016] [Indexed: 10/22/2022]
Abstract
Following a large regulatory reform in 2009, which ended the state's pharmacy monopoly, non-pharmacy retailers in Sweden today sell certain over-the-counter (OTC) drugs. The aim of this study was to investigate consumer preferences regarding OTC drug retailers and the reasons for choosing a pharmacy versus non-pharmacy retailer. We conducted a web survey aimed at Swedish adults. Out of a stratified sample of 4058 persons, 2594 agreed to take part (48% women; mean age: 50.3 years). Questions related to OTC drug use, retailer choice and factors affecting the participants' preferences for OTC drug retailers. Logistic regression was conducted to analyse OTC drug use and reasons for retailer choice in relation to sex, age and education. Nine in ten participants reported OTC drug use in the 6 months prior to the study. For their last OTC purchase, 76% had gone to a pharmacy, 20% to a grocery shop and 4% to a convenience store, gas station or online. Geographic proximity, opening hours and product range were reported as the most important factors in retailer choice. Counselling by trained staff was important to 57% of participants. The end of the state's pharmacy monopoly and the increase in number of pharmacies seem to have impacted more on Swedish consumers' purchase behaviours compared with the deregulation of OTC drug sales.
Collapse
Affiliation(s)
- Helle Håkonsen
- Department of Public Health and Community Medicine, Institute of Medicine, University of Gothenburg, PO Box 453, SE 405 30 Gothenburg, Sweden.
| | - Karolina Andersson Sundell
- Department of Public Health and Community Medicine, Institute of Medicine, University of Gothenburg, PO Box 453, SE 405 30 Gothenburg, Sweden
| | - Johan Martinsson
- Department of Political Science, University of Gothenburg, PO Box 711, SE 405 30 Gothenburg, Sweden.
| | - Tove Hedenrud
- Department of Public Health and Community Medicine, Institute of Medicine, University of Gothenburg, PO Box 453, SE 405 30 Gothenburg, Sweden.
| |
Collapse
|
16
|
Choi JS, Nam MH, Yoon SY, Kang SH. MicroRNA-194-5p could serve as a diagnostic and prognostic biomarker in myelodysplastic syndromes. Leuk Res 2015; 39:763-8. [PMID: 25975751 DOI: 10.1016/j.leukres.2015.04.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 03/26/2015] [Accepted: 04/19/2015] [Indexed: 12/12/2022]
Abstract
Trisomy 8 and trisomy 1q are the most frequent chromosomal abnormalities in Korean patients with myelodysplastic syndrome (MDS). MicroRNA (miRNA) deregulation is involved in the development of hematological malignancies, including MDS, and cancer-associated genomic regions are known to encode miRNAs. The aim of the present study was to investigate the involvement of miRNAs encoded by chromosomes 8 and 1q in MDS. For this, the expression of nine miRNAs encoded by chromosome 8 (miR-30b-5p, miR-30d-5p, miR-101-3p, miR-124-3p, miR-151a-5p, miR-320a, miR-486-5p, miR-596, and miR-875-5p) and three miRNAs encoded by chromosome 1q (miR-29c-3p, miR-194-5p, and miR-214-3p) was compared between 65 MDS patients and 11 controls. We found a significant upregulation of miR-194-5p (5.1-fold, P=0.002) and miR-320a (2.94-fold, P=0.016) in MDS patients compared with controls. The patients with low miR-194-5p expression showed a significantly decreased overall survival (P=0.049). The areas under the miR-194-5p and miR-320a ROC curves were 0.797 (P=0.002) and 0.729 (P=0.016), respectively. Although these findings need to be validated in a larger patient population, our results indicate that miR-194-5p is a candidate diagnostic biomarker for MDS and that low miR-194-5p expression could be associated with poor overall survival for MDS patients.
Collapse
Affiliation(s)
- Ji-Seon Choi
- Department of Laboratory Medicine, Korea University College of Medicine, Seoul, South Korea
| | - Myung-Hyun Nam
- Department of Laboratory Medicine, Korea University College of Medicine, Seoul, South Korea
| | - Soo-Young Yoon
- Department of Laboratory Medicine, Korea University College of Medicine, Seoul, South Korea
| | - Seong-Ho Kang
- Department of Laboratory Medicine, Chosun University College of Medicine, Gwangju, South Korea.
| |
Collapse
|
17
|
Sun JY. Clustered airline flight scheduling: Evidence from airline deregulation in Korea. J Air Transp Manag 2015; 42:85-94. [PMID: 32372850 PMCID: PMC7148908 DOI: 10.1016/j.jairtraman.2014.09.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2013] [Revised: 09/03/2014] [Accepted: 09/09/2014] [Indexed: 06/11/2023]
Abstract
This paper explores the impacts of competition level on airline scheduling in the Korean domestic short-haul routes where a hub-and-spoke system is not the optimal air transport network strategy. The empirical findings using the Korean airline panel data for the period 2006-2010 suggest that competition leads to less differentiated departure flight times as expected from spatial competition theory. Unlike the previous study on the U.S airline industry, the degree of this tendency for less differentiation differs across the type of routes: the Jeju island routes (leisure type) and the inland routes (business type), in the deregulated period. Following the May 2008 Deregulation Act we find an increasingly clustered pattern of airline scheduling in the Jeju island routes where there have been competitive pressures associated with new low cost entrants. This recent evidence would imply that airline carriers strategically schedule departure flight times and allocate flights between routes as competition increases in the deregulated period.
Collapse
|
18
|
Vogler S, Habimana K, Arts D. Does deregulation in community pharmacy impact accessibility of medicines, quality of pharmacy services and costs? Evidence from nine European countries. Health Policy 2014; 117:311-27. [PMID: 24962537 DOI: 10.1016/j.healthpol.2014.06.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 04/28/2014] [Accepted: 06/02/2014] [Indexed: 10/25/2022]
Abstract
OBJECTIVE To analyse the impact of deregulation in community pharmacy on accessibility of medicines, quality of pharmacy services and costs. METHODS We analysed and compared community pharmacy systems in five rather deregulated countries (England, Ireland, the Netherlands, Norway, Sweden) and four rather regulated countries (Austria, Denmark, Finland, Spain). Data were collected by literature review, a questionnaire survey and interviews. RESULTS Following a deregulation, several new pharmacies and dispensaries of Over-the-Counter (OTC) medicines tended to be established, predominantly in urban areas. Unless prevented by regulation, specific stakeholders, e.g. wholesalers, were seen to gain market dominance which limited envisaged competition. There were indications for an increased workload for pharmacists in some deregulated countries. Economic pressure to increase the pharmacy turnover through the sale of OTC medicines and non-pharmaceuticals was observed in deregulated and regulated countries. Prices of OTC medicines were not found to decrease after a deregulation in pharmacy. CONCLUSIONS Access to pharmacies usually increases after a deregulation but this is likely to favour urban populations with already good accessibility. Policy-makers are recommended to take action to ensure equitable accessibility and sustainable competition in a more deregulated environment. No association between pharmaceutical expenditure and the extent of regulation/deregulation appears to exist.
Collapse
Affiliation(s)
- Sabine Vogler
- WHO Collaborating Centre for Pharmaceutical Pricing and Reimbursement Policies, Health Economics Department, Gesundheit Österreich GmbH/Österreichisches Bundesinstitut für Gesundheitswesen (GÖG/ÖBIG, Austrian Health Institute), Stubenring 6, 1010 Vienna, Austria(2).
| | - Katharina Habimana
- WHO Collaborating Centre for Pharmaceutical Pricing and Reimbursement Policies, Health Economics Department, Gesundheit Österreich GmbH/Österreichisches Bundesinstitut für Gesundheitswesen (GÖG/ÖBIG, Austrian Health Institute), Stubenring 6, 1010 Vienna, Austria(2).
| | - Danielle Arts
- WHO Collaborating Centre for Pharmaceutical Pricing and Reimbursement Policies, Health Economics Department, Gesundheit Österreich GmbH/Österreichisches Bundesinstitut für Gesundheitswesen (GÖG/ÖBIG, Austrian Health Institute), Stubenring 6, 1010 Vienna, Austria(2); Leibniz Institute for Prevention Research and Epidemiology - BIPS GmbH, Achterstraße 30, 28359 Bremen, Germany.
| |
Collapse
|
19
|
Abstract
A few signaling pathways are driving the growth of hepatocellular carcinoma. Each of these pathways possesses negative regulators. These enzymes, which normally suppress unchecked cell proliferation, are circumvented in the oncogenic process, either the over-activity of oncogenes is sufficient to annihilate the activity of tumor suppressors or tumor suppressors have been rendered ineffective. The loss of several key tumor suppressors has been described in hepatocellular carcinoma. Here, we systematically review the evidence implicating tumor suppressors in the development of hepatocellular carcinoma.
Collapse
|