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Macrophages at the interface of the co-evolving cancer ecosystem. Cell 2023; 186:1627-1651. [PMID: 36924769 DOI: 10.1016/j.cell.2023.02.020] [Citation(s) in RCA: 80] [Impact Index Per Article: 80.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 02/15/2023] [Accepted: 02/15/2023] [Indexed: 03/17/2023]
Abstract
Macrophages are versatile and heterogeneous innate immune cells undertaking central functions in balancing immune responses and tissue repair to maintain homeostasis. This plasticity, once co-opted by malignant outgrowth, orchestrates manifold reciprocal interactions within the tumor microenvironment, fueling the evolution of the cancer ecosystem. Here, we review the multilayered sources of influence that jointly underpin and longitudinally shape tumor-associated macrophage (TAM) phenotypic states in solid neoplasms. We discuss how, in response to these signals, TAMs steer tumor evolution in the context of natural selection, biological dispersion, and treatment resistance. A number of research frontiers to be tackled are laid down in this review to therapeutically exploit the complex roles of TAMs in cancer. Building upon knowledge obtained from currently applied TAM-targeting strategies and using next generation technologies, we propose conceptual advances and novel therapeutic avenues to rewire TAM multifaceted regulation of the co-evolving cancer ecosystem.
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2
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Kapsetaki SE, Marquez Alcaraz G, Maley CC, Whisner CM, Aktipis A. Diet, Microbes, and Cancer Across the Tree of Life: a Systematic Review. Curr Nutr Rep 2022; 11:508-525. [PMID: 35704266 PMCID: PMC9197725 DOI: 10.1007/s13668-022-00420-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/21/2022] [Indexed: 11/09/2022]
Abstract
PURPOSE OF REVIEW Cancers are a leading cause of death in humans and for many other species. Diet has often been associated with cancers, and the microbiome is an essential mediator between diet and cancers. Here, we review the work on cancer and the microbiome across species to search for broad patterns of susceptibility associated with different microbial species. RECENT FINDINGS Some microbes, such as Helicobacter bacteria, papillomaviruses, and the carnivore-associated Fusobacteria, consistently induce tumorigenesis in humans and other species. Other microbes, such as the milk-associated Lactobacillus, consistently inhibit tumorigenesis in humans and other species. We systematically reviewed over a thousand published articles and identified links between diet, microbes, and cancers in several species of mammals, birds, and flies. Future work should examine a larger variety of host species to discover new model organisms for human preclinical trials, to better understand the observed variance in cancer prevalence across species, and to discover which microbes and diets are associated with cancers across species. Ultimately, this could help identify microbial and dietary interventions to diagnose, prevent, and treat cancers in humans as well as other animals.
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Affiliation(s)
- Stefania E Kapsetaki
- Arizona Cancer Evolution Center, Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ, USA.
- Biodesign Center for Biocomputing, Security and Society, Arizona State University, Tempe, USA.
| | - Gissel Marquez Alcaraz
- Arizona Cancer Evolution Center, Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ, USA
- Biodesign Center for Biocomputing, Security and Society, Arizona State University, Tempe, USA
| | - Carlo C Maley
- Arizona Cancer Evolution Center, Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ, USA
- Biodesign Center for Biocomputing, Security and Society, Arizona State University, Tempe, USA
| | - Corrie M Whisner
- College of Health Solutions, Arizona State University, Phoenix, AZ, USA
- Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, AZ, USA
| | - Athena Aktipis
- Arizona Cancer Evolution Center, Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ, USA
- Department of Psychology, Arizona State University, Tempe, AZ, USA
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3
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Dujon AM, Aktipis A, Alix‐Panabières C, Amend SR, Boddy AM, Brown JS, Capp J, DeGregori J, Ewald P, Gatenby R, Gerlinger M, Giraudeau M, Hamede RK, Hansen E, Kareva I, Maley CC, Marusyk A, McGranahan N, Metzger MJ, Nedelcu AM, Noble R, Nunney L, Pienta KJ, Polyak K, Pujol P, Read AF, Roche B, Sebens S, Solary E, Staňková K, Swain Ewald H, Thomas F, Ujvari B. Identifying key questions in the ecology and evolution of cancer. Evol Appl 2021; 14:877-892. [PMID: 33897809 PMCID: PMC8061275 DOI: 10.1111/eva.13190] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/24/2020] [Accepted: 12/26/2020] [Indexed: 12/17/2022] Open
Abstract
The application of evolutionary and ecological principles to cancer prevention and treatment, as well as recognizing cancer as a selection force in nature, has gained impetus over the last 50 years. Following the initial theoretical approaches that combined knowledge from interdisciplinary fields, it became clear that using the eco-evolutionary framework is of key importance to understand cancer. We are now at a pivotal point where accumulating evidence starts to steer the future directions of the discipline and allows us to underpin the key challenges that remain to be addressed. Here, we aim to assess current advancements in the field and to suggest future directions for research. First, we summarize cancer research areas that, so far, have assimilated ecological and evolutionary principles into their approaches and illustrate their key importance. Then, we assembled 33 experts and identified 84 key questions, organized around nine major themes, to pave the foundations for research to come. We highlight the urgent need for broadening the portfolio of research directions to stimulate novel approaches at the interface of oncology and ecological and evolutionary sciences. We conclude that progressive and efficient cross-disciplinary collaborations that draw on the expertise of the fields of ecology, evolution and cancer are essential in order to efficiently address current and future questions about cancer.
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Affiliation(s)
- Antoine M. Dujon
- School of Life and Environmental SciencesCentre for Integrative EcologyDeakin UniversityWaurn PondsVic.Australia
- CREEC/CANECEV, MIVEGEC (CREES), University of Montpellier, CNRS, IRDMontpellierFrance
| | - Athena Aktipis
- Biodesign InstituteDepartment of PsychologyArizona State UniversityTempeAZUSA
| | - Catherine Alix‐Panabières
- Laboratory of Rare Human Circulating Cells (LCCRH)University Medical Center of MontpellierMontpellierFrance
| | - Sarah R. Amend
- Brady Urological InstituteThe Johns Hopkins School of MedicineBaltimoreMDUSA
| | - Amy M. Boddy
- Department of AnthropologyUniversity of California Santa BarbaraSanta BarbaraCAUSA
| | - Joel S. Brown
- Department of Integrated MathematicsMoffitt Cancer CenterTampaFLUSA
| | - Jean‐Pascal Capp
- Toulouse Biotechnology InstituteINSA/University of ToulouseCNRSINRAEToulouseFrance
| | - James DeGregori
- Department of Biochemistry and Molecular GeneticsIntegrated Department of ImmunologyDepartment of PaediatricsDepartment of Medicine (Section of Hematology)University of Colorado School of MedicineAuroraCOUSA
| | - Paul Ewald
- Department of BiologyUniversity of LouisvilleLouisvilleKYUSA
| | - Robert Gatenby
- Department of RadiologyH. Lee Moffitt Cancer Center & Research InstituteTampaFLUSA
| | - Marco Gerlinger
- Translational Oncogenomics LabThe Institute of Cancer ResearchLondonUK
| | - Mathieu Giraudeau
- CREEC/CANECEV, MIVEGEC (CREES), University of Montpellier, CNRS, IRDMontpellierFrance
- Littoral Environnement et Sociétés (LIENSs)UMR 7266CNRS‐Université de La RochelleLa RochelleFrance
| | | | - Elsa Hansen
- Center for Infectious Disease Dynamics, Biology DepartmentPennsylvania State UniversityUniversity ParkPAUSA
| | - Irina Kareva
- Mathematical and Computational Sciences CenterSchool of Human Evolution and Social ChangeArizona State UniversityTempeAZUSA
| | - Carlo C. Maley
- Arizona Cancer Evolution CenterBiodesign Institute and School of Life SciencesArizona State UniversityTempeAZUSA
| | - Andriy Marusyk
- Department of Cancer PhysiologyH Lee Moffitt Cancer Centre and Research InstituteTampaFLUSA
| | - Nicholas McGranahan
- Translational Cancer Therapeutics LaboratoryThe Francis Crick InstituteLondonUK
- Cancer Research UK Lung Cancer Centre of ExcellenceUniversity College London Cancer InstituteLondonUK
| | | | | | - Robert Noble
- Department of Biosystems Science and EngineeringETH ZurichBaselSwitzerland
- Department of Evolutionary Biology and Environmental StudiesUniversity of ZurichZurichSwitzerland
| | - Leonard Nunney
- Department of Evolution, Ecology, and Organismal BiologyUniversity of California RiversideRiversideCAUSA
| | - Kenneth J. Pienta
- Brady Urological InstituteThe Johns Hopkins School of MedicineBaltimoreMDUSA
| | - Kornelia Polyak
- Department of Medical OncologyDana‐Farber Cancer InstituteBostonMAUSA
- Department of MedicineHarvard Medical SchoolBostonMAUSA
| | - Pascal Pujol
- CREEC/CANECEV, MIVEGEC (CREES), University of Montpellier, CNRS, IRDMontpellierFrance
- Centre Hospitalier Universitaire Arnaud de VilleneuveMontpellierFrance
| | - Andrew F. Read
- Center for Infectious Disease DynamicsHuck Institutes of the Life SciencesDepartments of Biology and EntomologyPennsylvania State UniversityUniversity ParkPAUSA
| | - Benjamin Roche
- CREEC/CANECEV, MIVEGEC (CREES), University of Montpellier, CNRS, IRDMontpellierFrance
- Unité Mixte Internationale de Modélisation Mathématique et Informatique des Systèmes ComplexesUMI IRD/Sorbonne UniversitéUMMISCOBondyFrance
| | - Susanne Sebens
- Institute for Experimental Cancer Research Kiel University and University Hospital Schleswig‐HolsteinKielGermany
| | - Eric Solary
- INSERM U1287Gustave RoussyVillejuifFrance
- Faculté de MédecineUniversité Paris‐SaclayLe Kremlin‐BicêtreFrance
| | - Kateřina Staňková
- Department of Data Science and Knowledge EngineeringMaastricht UniversityMaastrichtThe Netherlands
- Delft Institute of Applied MathematicsDelft University of TechnologyDelftThe Netherlands
| | | | - Frédéric Thomas
- CREEC/CANECEV, MIVEGEC (CREES), University of Montpellier, CNRS, IRDMontpellierFrance
| | - Beata Ujvari
- School of Life and Environmental SciencesCentre for Integrative EcologyDeakin UniversityWaurn PondsVic.Australia
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4
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Park DS, Luddy KA, Robertson-Tessi M, O'Farrelly C, Gatenby RA, Anderson ARA. Searching for Goldilocks: How Evolution and Ecology Can Help Uncover More Effective Patient-Specific Chemotherapies. Cancer Res 2020; 80:5147-5154. [PMID: 32934022 PMCID: PMC10940023 DOI: 10.1158/0008-5472.can-19-3981] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 08/04/2020] [Accepted: 09/09/2020] [Indexed: 11/16/2022]
Abstract
Deaths from cancer are mostly due to metastatic disease that becomes resistant to therapy. A mainstay treatment for many cancers is chemotherapy, for which the dosing strategy is primarily limited by patient toxicity. While this MTD approach builds upon the intuitively appealing principle that maximum therapeutic benefit is achieved by killing the largest possible number of cancer cells, there is increasing evidence that moderation might allow host-specific features to contribute to success. We believe that a "Goldilocks Window" of submaximal chemotherapy will yield improved overall outcomes. This window combines the complex interplay of cancer cell death, immune activity, emergence of chemoresistance, and metastatic dissemination. These multiple activities driven by chemotherapy have tradeoffs that depend on the specific agents used as well as their dosing levels and schedule. Here we present evidence supporting the idea that MTD may not always be the best approach and offer suggestions toward a more personalized treatment regime that integrates insights into patient-specific eco-evolutionary dynamics.
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Affiliation(s)
- Derek S Park
- Department of Integrated Mathematical Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida.
| | - Kimberly A Luddy
- Trinity Biosciences Institute, Trinity College, Dublin, Ireland
- Department of Cancer Physiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Mark Robertson-Tessi
- Department of Integrated Mathematical Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | | | - Robert A Gatenby
- Department of Integrated Mathematical Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
- Department of Radiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Alexander R A Anderson
- Department of Integrated Mathematical Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida.
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5
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Blackstone NW, Gutterman JU. Can natural selection and druggable targets synergize? Of nutrient scarcity, cancer, and the evolution of cooperation. Bioessays 2020; 43:e2000160. [PMID: 33165962 DOI: 10.1002/bies.202000160] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 10/03/2020] [Accepted: 10/06/2020] [Indexed: 01/21/2023]
Abstract
Since the dawn of molecular biology, cancer therapy has focused on druggable targets. Despite some remarkable successes, cell-level evolution remains a potent antagonist to this approach. We suggest that a deeper understanding of the breakdown of cooperation can synergize the evolutionary and druggable-targets approaches. Complexity requires cooperation, whether between cells of different species (symbiosis) or between cells of the same organism (multicellularity). Both forms of cooperation may be associated with nutrient scarcity, which in turn may be associated with a chemiosmotic metabolism. A variety of examples from modern organisms supports these generalities. Indeed, mammalian cancers-unicellular, glycolytic, and fast-replicating-parallel these examples. Nutrient scarcity, chemiosmosis, and associated signaling may favor cooperation, while under conditions of nutrient abundance a fermentative metabolism may signal the breakdown of cooperation. Manipulating this metabolic milieu may potentiate the effects of targeted therapeutics. Specific opportunities are discussed in this regard, including avicins, a novel plant product.
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Affiliation(s)
- Neil W Blackstone
- Department of Biological Sciences, Northern Illinois University, DeKalb, Illinois, USA
| | - Jordan U Gutterman
- Department of Leukemia, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
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6
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Tissot T, Massol F, Ujvari B, Alix-Panabieres C, Loeuille N, Thomas F. Metastasis and the evolution of dispersal. Proc Biol Sci 2019; 286:20192186. [PMID: 31771479 DOI: 10.1098/rspb.2019.2186] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Despite significant progress in oncology, metastasis remains the leading cause of mortality of cancer patients. Understanding the foundations of this phenomenon could help contain or even prevent it. As suggested by many ecologists and cancer biologists, metastasis could be considered through the lens of biological dispersal: the movement of cancer cells from their birth site (the primary tumour) to other habitats where they resume proliferation (metastatic sites). However, whether this model can consistently be applied to the emergence and dynamics of metastasis remains unclear. Here, we provide a broad review of various aspects of the evolution of dispersal in ecosystems. We investigate whether similar ecological and evolutionary principles can be applied to metastasis, and how these processes may shape the spatio-temporal dynamics of disseminating cancer cells. We further discuss complementary hypotheses and propose experimental approaches to test the relevance of the evolutionary ecology of dispersal in studying metastasis.
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Affiliation(s)
- Tazzio Tissot
- Institute of Ecology and Environmental Sciences, Sorbonne University/CNRS/INRA/IRD/UPEC/Paris-Diderot University, Paris, France.,Eco-Anthropology, MNHN/CNRS/Paris-Diderot University, Paris, France
| | - François Massol
- Univ. Lille, CNRS, UMR 8198-Evo-Eco-Paleo, F-59000 Lille, France.,Univ. Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019-UMR 8204-CIIL-Center for Infection and Immunity of Lille, F-59000 Lille, France
| | - Beata Ujvari
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Waurn Ponds, Victoria, Australia
| | - Catherine Alix-Panabieres
- Laboratory of Rare Human Circulating Cells (LCCRH), University Medical Centre of Montpellier, Montpellier, France
| | - Nicolas Loeuille
- Institute of Ecology and Environmental Sciences, Sorbonne University/CNRS/INRA/IRD/UPEC/Paris-Diderot University, Paris, France
| | - Frédéric Thomas
- CREEC (CREES), Unité Mixte de Recherches, IRD 224-CNRS 5290-Université de Montpellier, Montpellier, France
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7
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De la Fuente IM, Bringas C, Malaina I, Fedetz M, Carrasco-Pujante J, Morales M, Knafo S, Martínez L, Pérez-Samartín A, López JI, Pérez-Yarza G, Boyano MD. Evidence of conditioned behavior in amoebae. Nat Commun 2019; 10:3690. [PMID: 31417086 PMCID: PMC6695432 DOI: 10.1038/s41467-019-11677-w] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 07/26/2019] [Indexed: 01/05/2023] Open
Abstract
Associative memory is the main type of learning by which complex organisms endowed with evolved nervous systems respond efficiently to certain environmental stimuli. It has been found in different multicellular species, from cephalopods to humans, but never in individual cells. Here we describe a motility pattern consistent with associative conditioned behavior in the microorganism Amoeba proteus. We use a controlled direct-current electric field as the conditioned stimulus, and a specific chemotactic peptide as the unconditioned stimulus. The amoebae are capable of linking two independent past events, generating persistent locomotion movements that can prevail for 44 min on average. We confirm a similar behavior in a related species, Metamoeba leningradensis. Thus, our results indicate that unicellular organisms can modify their behavior during migration by associative conditioning.
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Affiliation(s)
- Ildefonso M De la Fuente
- Department of Nutrition, CEBAS-CSIC Institute, Espinardo University Campus, Murcia, 30100, Spain.
- Department of Mathematics, Faculty of Science and Technology, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain.
| | - Carlos Bringas
- Department of Cell Biology and Histology, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | - Iker Malaina
- Department of Mathematics, Faculty of Science and Technology, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | - María Fedetz
- Department of Cell Biology and Immunology, Institute of Parasitology and Biomedicine "López-Neyra", CSIC, Granada, 18016, Spain
| | - Jose Carrasco-Pujante
- Department of Cell Biology and Histology, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | - Miguel Morales
- Biophysics Institute, CSIC-UPV/EHU, University of the Basque Country (UPV/EHU), Leioa, 48940, Spain
| | - Shira Knafo
- Biophysics Institute, CSIC-UPV/EHU, University of the Basque Country (UPV/EHU), Leioa, 48940, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, 48013, Spain
- Department of Physiology and Cell Biology, Faculty of Health Sciences, and The National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Luis Martínez
- Department of Mathematics, Faculty of Science and Technology, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
- Basque Center of Applied Mathematics (BCAM), Bilbao, 48009, Spain
| | - Alberto Pérez-Samartín
- Department of Neurosciences, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | - José I López
- Department of Pathology, Cruces University Hospital, Biocruces-Bizkaia Health Research Institute, University of the Basque Country (UPV/EHU), Barakaldo, 48903, Spain
| | - Gorka Pérez-Yarza
- Department of Cell Biology and Histology, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | - María Dolores Boyano
- Department of Cell Biology and Histology, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
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8
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Park HJ, Gokhale CS. Ecological feedback on diffusion dynamics. ROYAL SOCIETY OPEN SCIENCE 2019; 6:181273. [PMID: 30891264 PMCID: PMC6408370 DOI: 10.1098/rsos.181273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 01/09/2019] [Indexed: 06/09/2023]
Abstract
Spatial patterns are ubiquitous across different scales of organization in ecological systems. Animal coat pattern, spatial organization of insect colonies and vegetation in arid areas are prominent examples from such diverse ecologies. Typically, pattern formation has been described by reaction-diffusion equations, which consider individuals dispersing between subpopulations of a global pool. This framework applied to public goods game nicely showed the endurance of populations via diffusion and generation of spatial patterns. However, how the spatial characteristics, such as diffusion, are related to the eco-evolutionary process as well as the nature of the feedback from evolution to ecology and vice versa, has been so far neglected. We present a thorough analysis of the ecologically driven evolutionary dynamics in a spatially extended version of ecological public goods games. Furthermore, we show how these evolutionary dynamics feed back into shaping the ecology, thus together determining the fate of the system.
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Affiliation(s)
- Hye Jin Park
- Department of Evolutionary Theory, Max Planck Institute for Evolutionary Biology, August Thienemann Street 2, 24306 Plön, Germany
| | - Chaitanya S. Gokhale
- Research Group for Theoretical Models of Eco-evolutionary Dynamics, Department of Evolutionary Theory, Max Planck Institute for Evolutionary Biology, August Thienemann Street 2, 24306 Plön, Germany
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9
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Wu DJ, Aktipis A, Pepper JW. Energy oversupply to tissues: a single mechanism possibly underlying multiple cancer risk factors. Evol Med Public Health 2019; 2019:9-16. [PMID: 31893122 PMCID: PMC6379718 DOI: 10.1093/emph/eoz004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 01/15/2019] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Several major risk factors for cancer involve vascular oversupply of energy to affected tissues. These include obesity, diabetes and chronic inflammation. Here, we propose a potential mechanistic explanation for the association between energy oversupply and cancer risk, which we call the metabolic cancer suppression hypothesis: We hypothesize that oncogenesis is normally suppressed by organismal physiology that regulates and strictly limits normal energy supply to somatic cells, and that this protection is removed by abnormal oversupply of energy. METHODOLOGY We evaluate this hypothesis using a computational model of somatic cell evolution to simulate experimental manipulation of the vascular energy supply to a tissue. The model simulates the evolutionary dynamics of somatic cells during oncogenesis. RESULTS In our simulation experiment, we found that under plausible biological assumptions, elevated energy supply to a tissue led to the evolution of elevated energy uptake by somatic cells, leading to the rapid evolution of both defining traits of cancer cells: hyperproliferation, and tissue invasion. CONCLUSIONS AND IMPLICATIONS Our results support the hypothesis of metabolic cancer suppression, suggesting that vascular oversupply of energetic resources to somatic cells removes normal energetic limitations on cell proliferation, and that this accelerates cellular evolution toward cancer. Various predictions of this hypothesis are amenable to empirical testing, and have promising implications for translational research toward clinical cancer prevention.
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Affiliation(s)
- Daniel J Wu
- Department of Biology, Stanford University, Stanford, CA, USA
- Division of Cancer Prevention, National Cancer Institute, Rockville, MD, USA
| | - Athena Aktipis
- Arizona State University, Biodesign Institute, Tempe, AZ, USA
| | - John W Pepper
- Division of Cancer Prevention, National Cancer Institute, Rockville, MD, USA
- Santa Fe Institute, Santa Fe, NM, USA
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10
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Apari P, Müller V. Paradoxes of tumour complexity: somatic selection, vulnerability by design, or infectious aetiology? Biol Rev Camb Philos Soc 2018; 94:1075-1088. [PMID: 30592143 DOI: 10.1111/brv.12490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 11/28/2018] [Accepted: 11/30/2018] [Indexed: 12/01/2022]
Abstract
The aetiology of cancer involves intricate cellular and molecular mechanisms that apparently emerge on the short timescale of a single lifetime. Some of these traits are remarkable not only for their complexity, but also because it is hard to conceive selection pressures that would favour their evolution within the local competitive microenvironment of the tumour. Examples include 'niche construction' (re-programming of tumour-specific target sites) to create permissive conditions for distant metastases; long-range feedback loops of tumour growth; and remarkably 'plastic' phenotypes (e.g. density-dependent dispersal) associated with metastatic cancer. These traits, which we term 'paradoxical tumour traits', facilitate the long-range spread or long-term persistence of the tumours, but offer no apparent benefit, and might even incur costs in the competition of clones within the tumour. We discuss three possible scenarios for the origin of these characters: somatic selection driven by specific selection regimes; non-adaptive emergence due to inherent vulnerabilities in the organism; and manipulation by putative transmissible agents that contribute to and benefit from these traits. Our work highlights a lack of understanding of some aspects of tumour development, and offers alternative hypotheses that might guide further research.
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Affiliation(s)
- Péter Apari
- Institute of Biology, Eötvös Loránd University, Budapest 1117, Hungary.,Evolutionary Systems Research Group, MTA Centre for Ecological Research, Tihany 8237, Hungary
| | - Viktor Müller
- Institute of Biology, Eötvös Loránd University, Budapest 1117, Hungary.,Evolutionary Systems Research Group, MTA Centre for Ecological Research, Tihany 8237, Hungary
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11
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Amend SR, Gatenby RA, Pienta KJ, Brown JS. Cancer Foraging Ecology: Diet Choice, Patch Use, and Habitat Selection of Cancer Cells. CURRENT PATHOBIOLOGY REPORTS 2018. [DOI: 10.1007/s40139-018-0185-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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12
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Abstract
Purpose In this paper, we provide an overview of a life history theory and how it applies to cancer evolution. Recent Findings We review the literature on trade-offs in tumors, focusing on the trade-offs among cellular proliferation, survival, and motility. Trade-offs are critical natural constraints for almost all evolutionary processes. Many ecological studies show that trade-offs among these cellular functions maintain a genetic diversity. In addition, these trade-offs are not fixed, but rather can shift depending on the ecological circumstances in the microenvironment. This can lead to selection for the cellular capacity to respond to these differing microenvironments in ways that promote the fitness of the cancer cell. We relate these life history trade-offs to the recently developed Evo-Eco indexes and discuss how life history theory can help refine our measures of tumor evolution and ecology. Summary Life history theory provides a framework for understanding how the spatial and temporal variability in the tumor microenvironment—in particular resources and threats—affect trade-offs among cell survival, cell proliferation, and cell migration. We discuss how these trade-offs can potentially be leveraged in cancer therapy to increase the effectiveness of treatment.
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13
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Leong SP, Aktipis A, Maley C. Cancer initiation and progression within the cancer microenvironment. Clin Exp Metastasis 2018; 35:361-367. [PMID: 29992410 DOI: 10.1007/s10585-018-9921-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 05/10/2018] [Indexed: 12/22/2022]
Abstract
Within the cancer microenvironment, the growth and proliferation of cancer cells in the primary site as well as in the metastatic site represent a global biological phenomenon. To understand the growth, proliferation and progression of cancer either by local expansion and/or metastasis, it is important to understand the cancer microenvironment and host response to cancer growth. Melanoma is an excellent model to study the interaction of cancer initiation and growth in relationship to its microenvironment. Social evolution with cooperative cellular groups within an organism is what gives rise to multicellularity in the first place. Cancer cells evolve to exploit their cellular environment. The foundations of multicellular cooperation break down in cancer because those cells that misbehave have an evolutionary advantage over their normally behaving neighbors. It is important to classify evolutionary and ecological aspects of cancer growth, thus, data for cancer growth and outcomes need to be collected to define these parameters so that accurate predictions of how cancer cells may proliferate and metastasize can be developed.
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Affiliation(s)
- Stanley P Leong
- Department of Surgery and Melanoma Center, California Pacific Medical Center and Research Institute, San Francisco, USA.
| | - Athena Aktipis
- Arizona Cancer and Evolution Center, Biodesign Institute, Arizona State University, Tempe, USA
| | - Carlo Maley
- Arizona Cancer and Evolution Center, Biodesign Institute, Arizona State University, Tempe, USA
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14
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Taylor TB, Wass AV, Johnson LJ, Dash P. Resource competition promotes tumour expansion in experimentally evolved cancer. BMC Evol Biol 2017; 17:268. [PMID: 29281983 PMCID: PMC5745887 DOI: 10.1186/s12862-017-1117-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 12/14/2017] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Tumour progression involves a series of phenotypic changes to cancer cells, each of which presents therapeutic targets. Here, using techniques adapted from microbial experimental evolution, we investigate the evolution of tumour spreading - a precursor for metastasis and tissue invasion - in environments with varied resource supply. Evolutionary theory predicts that competition for resources within a population will select for individuals to move away from a natal site (i.e. disperse), facilitating the colonisation of unexploited resources and decreasing competition between kin. RESULTS After approximately 100 generations in environments with low resource supply, we find that MCF7 breast cancer spheroids (small in vitro tumours) show increased spreading. Conversely, spreading slows compared to the ancestor where resource supply is high. Common garden experiments confirm that the evolutionary responses differ between selection lines; with lines evolved under low resource supply showing phenotypic plasticity in spheroid spreading rate. These differences in spreading behaviour between selection lines are heritable (stable across multiple generations), and show that the divergently evolved lines differ in their response to resource supply. CONCLUSIONS We observe dispersal-like behaviour and an increased sensitivity to resource availability in our selection lines, which may be a response to selection, or alternatively may be due to epigenetic changes, provoked by prolonged resource limitation, that have persisted across many cell generations. Different clinical strategies may be needed depending on whether or not tumour progression is due to natural selection. This study highlights the effectiveness of experimental evolution approaches in cancer cell populations and demonstrates how simple model systems might enable us to observe and measure key selective drivers of clinically important traits.
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Affiliation(s)
- Tiffany B Taylor
- School of Biological Sciences, University of Reading, Whiteknights, Reading, RG6 6AH, UK. .,Milner Centre for Evolution and Department of Biology and Biochemistry, University of Bath, Claverton Down Road, Bath, BA2 7AY, UK.
| | - Anastasia V Wass
- School of Biological Sciences, University of Reading, Whiteknights, Reading, RG6 6AH, UK
| | - Louise J Johnson
- School of Biological Sciences, University of Reading, Whiteknights, Reading, RG6 6AH, UK
| | - Phil Dash
- School of Biological Sciences, University of Reading, Whiteknights, Reading, RG6 6AH, UK
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15
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Maley CC, Aktipis A, Graham TA, Sottoriva A, Boddy AM, Janiszewska M, Silva AS, Gerlinger M, Yuan Y, Pienta KJ, Anderson KS, Gatenby R, Swanton C, Posada D, Wu CI, Schiffman JD, Hwang ES, Polyak K, Anderson ARA, Brown JS, Greaves M, Shibata D. Classifying the evolutionary and ecological features of neoplasms. Nat Rev Cancer 2017; 17:605-619. [PMID: 28912577 PMCID: PMC5811185 DOI: 10.1038/nrc.2017.69] [Citation(s) in RCA: 243] [Impact Index Per Article: 34.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Neoplasms change over time through a process of cell-level evolution, driven by genetic and epigenetic alterations. However, the ecology of the microenvironment of a neoplastic cell determines which changes provide adaptive benefits. There is widespread recognition of the importance of these evolutionary and ecological processes in cancer, but to date, no system has been proposed for drawing clinically relevant distinctions between how different tumours are evolving. On the basis of a consensus conference of experts in the fields of cancer evolution and cancer ecology, we propose a framework for classifying tumours that is based on four relevant components. These are the diversity of neoplastic cells (intratumoural heterogeneity) and changes over time in that diversity, which make up an evolutionary index (Evo-index), as well as the hazards to neoplastic cell survival and the resources available to neoplastic cells, which make up an ecological index (Eco-index). We review evidence demonstrating the importance of each of these factors and describe multiple methods that can be used to measure them. Development of this classification system holds promise for enabling clinicians to personalize optimal interventions based on the evolvability of the patient's tumour. The Evo- and Eco-indices provide a common lexicon for communicating about how neoplasms change in response to interventions, with potential implications for clinical trials, personalized medicine and basic cancer research.
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Affiliation(s)
- Carlo C Maley
- Virginia G. Piper Center for Personalized Diagnostics, Biodesign Institute, Arizona State University, 1001 S. McAllister Ave, Tempe, Arizona 85287, USA
| | - Athena Aktipis
- Department of Psychology, Center for Evolution and Medicine, Arizona State University, 651 E. University Drive, Tempe, Arizona 85287, USA
| | - Trevor A Graham
- Evolution and Cancer Laboratory, Centre for Tumour Biology, Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK
| | - Andrea Sottoriva
- Centre for Evolution and Cancer, The Institute of Cancer Research, 15 Cotswold Road, Sutton, London SM2 5NG, UK
| | - Amy M Boddy
- Department of Anthropology, University of California Santa Barbara, Santa Barbara, California 93106, USA
| | - Michalina Janiszewska
- Department of Medical Oncology, Dana-Farber Cancer Institute, 450 Brookline Avenue D740C, Boston, Massachusetts 02215, USA
| | - Ariosto S Silva
- Department of Cancer Imaging and Metabolism, Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, Florida 33612, USA
| | - Marco Gerlinger
- Centre for Evolution and Cancer, Division of Molecular Pathology, The Institute of Cancer Research, 237 Fulham Road, London SW3 6JB, UK
| | - Yinyin Yuan
- Centre for Evolution and Cancer, The Institute of Cancer Research, 15 Cotswold Road, Sutton, London SM2 5NG, UK
| | - Kenneth J Pienta
- Brady Urological Institute, The Johns Hopkins School of Medicine, 600 N. Wolfe Street, Baltimore, Maryland 21287, USA
| | - Karen S Anderson
- Virginia G. Piper Center for Personalized Diagnostics, Biodesign Institute, Arizona State University, 1001 S. McAllister Ave, Tempe, Arizona 85287, USA
| | - Robert Gatenby
- Cancer Biology and Evolution Program, Moffitt Cancer Center, 12902 Magnolia Drive, Tampa, Florida 33612, USA
| | - Charles Swanton
- Cancer Research UK Lung Cancer Centre of Excellence, University College London Cancer Institute, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6BT, UK
| | - David Posada
- Department of Biochemistry, Genetics and Immunology and Biomedical Research Center (CINBIO), University of Vigo, Spain; Galicia Sur Health Research Institute, Vigo, 36310, Spain
| | - Chung-I Wu
- Department of Ecology and Evolution, University of Chicago, Chicago, Illinois 60637, USA
| | - Joshua D Schiffman
- Departments of Pediatrics and Oncological Sciences, Huntsman Cancer Institute, University of Utah, 2000 Circle of Hope, Salt Lake City, Utah 84108, USA
| | - E Shelley Hwang
- Department of Surgery, Duke University and Duke Cancer Institute, 465 Seeley Mudd Building, Durham, North Carolina 27710, USA
| | - Kornelia Polyak
- Department of Medical Oncology, Dana-Farber Cancer Institute, 450 Brookline Avenue D740C, Boston, Massachusetts 02215, USA
| | - Alexander R A Anderson
- Integrated Mathematical Oncology Department, Moffitt Cancer Center, 12902 Magnolia Drive, Tampa, Florida 33612, USA
| | - Joel S Brown
- Integrated Mathematical Oncology Department, Moffitt Cancer Center, 12902 Magnolia Drive, Tampa, Florida 33612, USA
| | - Mel Greaves
- Centre for Evolution and Cancer, The Institute of Cancer Research, 15 Cotswold Road, Sutton, London SM2 5NG, UK
| | - Darryl Shibata
- Department of Pathology, Norris Comprehensive Cancer Center, University of Southern California, 1441 Eastlake Avenue, NOR2424, Los Angeles, California 90033, USA
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16
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Jacqueline C, Biro PA, Beckmann C, Moller AP, Renaud F, Sorci G, Tasiemski A, Ujvari B, Thomas F. Cancer: A disease at the crossroads of trade-offs. Evol Appl 2017; 10:215-225. [PMID: 28250806 PMCID: PMC5322410 DOI: 10.1111/eva.12444] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 11/01/2016] [Indexed: 12/14/2022] Open
Abstract
Central to evolutionary theory is the idea that living organisms face phenotypic and/or genetic trade-offs when allocating resources to competing life-history demands, such as growth, survival, and reproduction. These trade-offs are increasingly considered to be crucial to further our understanding of cancer. First, evidences suggest that neoplastic cells, as any living entities subject to natural selection, are governed by trade-offs such as between survival and proliferation. Second, selection might also have shaped trade-offs at the organismal level, especially regarding protective mechanisms against cancer. Cancer can also emerge as a consequence of additional trade-offs in organisms (e.g., eco-immunological trade-offs). Here, we review the wide range of trade-offs that occur at different scales and their relevance for understanding cancer dynamics. We also discuss how acknowledging these phenomena, in light of human evolutionary history, may suggest new guidelines for preventive and therapeutic strategies.
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Affiliation(s)
- Camille Jacqueline
- CREECMontpellier Cedex 5France
- MIVEGECUMR IRD/CNRS/UM 5290Montpellier Cedex 5France
| | - Peter A. Biro
- Centre for Integrative EcologySchool of Life and Environmental SciencesDeakin UniversityWaurn PondsVICAustralia
| | - Christa Beckmann
- Centre for Integrative EcologySchool of Life and Environmental SciencesDeakin UniversityWaurn PondsVICAustralia
| | - Anders Pape Moller
- Ecologie Systématique EvolutionUniversité Paris‐SudCNRSAgroParisTechUniversité Paris‐Saclay, F‐91405 Orsay CedexFrance
| | - François Renaud
- CREECMontpellier Cedex 5France
- MIVEGECUMR IRD/CNRS/UM 5290Montpellier Cedex 5France
| | - Gabriele Sorci
- BiogéoSciencesCNRS UMR 6282Université de BourgogneDijonFrance
| | - Aurélie Tasiemski
- Unité d'EvolutionEcologie et Paléontologie (EEP) Université de Lille 1 CNRS UMR 8198groupe d'Ecoimmunologie des AnnélidesVilleneuve‐d'AscqFrance
| | - Beata Ujvari
- Centre for Integrative EcologySchool of Life and Environmental SciencesDeakin UniversityWaurn PondsVICAustralia
| | - Frédéric Thomas
- CREECMontpellier Cedex 5France
- MIVEGECUMR IRD/CNRS/UM 5290Montpellier Cedex 5France
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17
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Fortunato A, Boddy A, Mallo D, Aktipis A, Maley CC, Pepper JW. Natural Selection in Cancer Biology: From Molecular Snowflakes to Trait Hallmarks. Cold Spring Harb Perspect Med 2017; 7:cshperspect.a029652. [PMID: 28148564 DOI: 10.1101/cshperspect.a029652] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Evolution by natural selection is the conceptual foundation for nearly every branch of biology and increasingly also for biomedicine and medical research. In cancer biology, evolution explains how populations of cells in tumors change over time. It is a fundamental question whether this evolutionary process is driven primarily by natural selection and adaptation or by other evolutionary processes such as founder effects and drift. In cancer biology, as in organismal evolutionary biology, there is controversy about this question and also about the use of adaptation through natural selection as a guiding framework for research. In this review, we discuss the differences and similarities between evolution among somatic cells versus evolution among organisms. We review what is known about the parameters and rate of evolution in neoplasms, as well as evidence for adaptation. We conclude that adaptation is a useful framework that accurately explains the defining characteristics of cancer. Further, convergent evolution through natural selection provides the only satisfying explanation both for how a group of diverse pathologies have enough in common to usefully share the descriptive label of "cancer" and for why this convergent condition becomes life-threatening.
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Affiliation(s)
- Angelo Fortunato
- Biodesign Center for Personalized Diagnostics, and School of Life Sciences, Arizona State University, Tempe, Arizona 85287
| | - Amy Boddy
- Department of Psychology, Arizona State University, Tempe, Arizona 85287
| | - Diego Mallo
- Biodesign Center for Personalized Diagnostics, and School of Life Sciences, Arizona State University, Tempe, Arizona 85287
| | - Athena Aktipis
- Department of Psychology, Arizona State University, Tempe, Arizona 85287.,Biodesign Center for Evolution and Medicine, Arizona State University, Tempe, Arizona 85287
| | - Carlo C Maley
- Biodesign Center for Personalized Diagnostics, and School of Life Sciences, Arizona State University, Tempe, Arizona 85287.,Centre for Evolution and Cancer, Institute of Cancer Research, London SM2 5NG, United Kingdom
| | - John W Pepper
- Biometry Research Group, Division of Cancer Prevention, National Cancer Institute, Rockville, Maryland 20850.,Santa Fe Institute, Santa Fe, New Mexico 87501
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18
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Lee SY, Jeong EK, Ju MK, Jeon HM, Kim MY, Kim CH, Park HG, Han SI, Kang HS. Induction of metastasis, cancer stem cell phenotype, and oncogenic metabolism in cancer cells by ionizing radiation. Mol Cancer 2017; 16:10. [PMID: 28137309 PMCID: PMC5282724 DOI: 10.1186/s12943-016-0577-4] [Citation(s) in RCA: 354] [Impact Index Per Article: 50.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 12/25/2016] [Indexed: 12/12/2022] Open
Abstract
Radiation therapy is one of the major tools of cancer treatment, and is widely used for a variety of malignant tumours. Radiotherapy causes DNA damage directly by ionization or indirectly via the generation of reactive oxygen species (ROS), thereby destroying cancer cells. However, ionizing radiation (IR) paradoxically promotes metastasis and invasion of cancer cells by inducing the epithelial-mesenchymal transition (EMT). Metastasis is a major obstacle to successful cancer therapy, and is closely linked to the rates of morbidity and mortality of many cancers. ROS have been shown to play important roles in mediating the biological effects of IR. ROS have been implicated in IR-induced EMT, via activation of several EMT transcription factors—including Snail, HIF-1, ZEB1, and STAT3—that are activated by signalling pathways, including those of TGF-β, Wnt, Hedgehog, Notch, G-CSF, EGFR/PI3K/Akt, and MAPK. Cancer cells that undergo EMT have been shown to acquire stemness and undergo metabolic changes, although these points are debated. IR is known to induce cancer stem cell (CSC) properties, including dedifferentiation and self-renewal, and to promote oncogenic metabolism by activating these EMT-inducing pathways. Much accumulated evidence has shown that metabolic alterations in cancer cells are closely associated with the EMT and CSC phenotypes; specifically, the IR-induced oncogenic metabolism seems to be required for acquisition of the EMT and CSC phenotypes. IR can also elicit various changes in the tumour microenvironment (TME) that may affect invasion and metastasis. EMT, CSC, and oncogenic metabolism are involved in radioresistance; targeting them may improve the efficacy of radiotherapy, preventing tumour recurrence and metastasis. This study focuses on the molecular mechanisms of IR-induced EMT, CSCs, oncogenic metabolism, and alterations in the TME. We discuss how IR-induced EMT/CSC/oncogenic metabolism may promote resistance to radiotherapy; we also review efforts to develop therapeutic approaches to eliminate these IR-induced adverse effects.
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Affiliation(s)
- Su Yeon Lee
- Department of Molecular Biology, College of Natural Sciences, Pusan National University, Pusan, 609-735, Korea
| | - Eui Kyong Jeong
- Department of Molecular Biology, College of Natural Sciences, Pusan National University, Pusan, 609-735, Korea
| | - Min Kyung Ju
- Department of Molecular Biology, College of Natural Sciences, Pusan National University, Pusan, 609-735, Korea
| | - Hyun Min Jeon
- Department of Molecular Biology, College of Natural Sciences, Pusan National University, Pusan, 609-735, Korea
| | - Min Young Kim
- Research Center, Dongnam Institute of Radiological and Medical Science (DIRAMS), Pusan, 619-953, Korea
| | - Cho Hee Kim
- Department of Molecular Biology, College of Natural Sciences, Pusan National University, Pusan, 609-735, Korea.,DNA Identification Center, National Forensic Service, Seoul, 158-707, Korea
| | - Hye Gyeong Park
- Nanobiotechnology Center, Pusan National University, Pusan, 609-735, Korea
| | - Song Iy Han
- The Division of Natural Medical Sciences, College of Health Science, Chosun University, Gwangju, 501-759, Korea
| | - Ho Sung Kang
- Department of Molecular Biology, College of Natural Sciences, Pusan National University, Pusan, 609-735, Korea.
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19
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Lloyd MC, Cunningham JJ, Bui MM, Gillies RJ, Brown JS, Gatenby RA. Darwinian Dynamics of Intratumoral Heterogeneity: Not Solely Random Mutations but Also Variable Environmental Selection Forces. Cancer Res 2016; 76:3136-44. [PMID: 27009166 DOI: 10.1158/0008-5472.can-15-2962] [Citation(s) in RCA: 166] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 03/07/2016] [Indexed: 01/06/2023]
Abstract
Spatial heterogeneity in tumors is generally thought to result from branching clonal evolution driven by random mutations that accumulate during tumor development. However, this concept rests on the implicit assumption that cancer cells never evolve to a fitness maximum because they can always acquire mutations that increase proliferative capacity. In this study, we investigated the validity of this assumption. Using evolutionary game theory, we demonstrate that local cancer cell populations will rapidly converge to the fittest phenotype given a stable environment. In such settings, cellular spatial heterogeneity in a tumor will be largely governed by regional variations in environmental conditions, for example, alterations in blood flow. Model simulations specifically predict a common spatial pattern in which cancer cells at the tumor-host interface exhibit invasion-promoting, rapidly proliferating phenotypic properties, whereas cells in the tumor core maximize their population density by promoting supportive tissue infrastructures, for example, to promote angiogenesis. We tested model predictions through detailed quantitative image analysis of phenotypic spatial distribution in histologic sections of 10 patients with stage 2 invasive breast cancers. CAIX, GLUT1, and Ki67 were upregulated in the tumor edge, consistent with an acid-producing invasive, proliferative phenotype. Cells in the tumor core were 20% denser than the edge, exhibiting upregulation of CAXII, HIF-1α, and cleaved caspase-3, consistent with a more static and less proliferative phenotype. Similarly, vascularity was consistently lower in the tumor center compared with the tumor edges. Lymphocytic immune responses to tumor antigens also trended to higher level in the tumor edge, although this effect did not reach statistical significance. Like invasive species in nature, cancer cells at the leading edge of the tumor possess a different phenotype from cells in the tumor core. Our results suggest that at least some of the molecular heterogeneity in cancer cells in tumors is governed by predictable regional variations in environmental selection forces, arguing against the assumption that cancer cells can evolve toward a local fitness maximum by random accumulation of mutations. Cancer Res; 76(11); 3136-44. ©2016 AACR.
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Affiliation(s)
- Mark C Lloyd
- Inspirata Inc. One North Dale Mabry, Tampa, Florida. Department of Biological Sciences, University of Illinois, Illinois, Chicago
| | - Jessica J Cunningham
- Department of Cancer Imaging and Metabolism, H Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Marilyn M Bui
- Department of Cancer Imaging and Metabolism, H Lee Moffitt Cancer Center and Research Institute, Tampa, Florida. Department of Pathology, H Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Robert J Gillies
- Department of Cancer Imaging and Metabolism, H Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Joel S Brown
- Department of Biological Sciences, University of Illinois, Illinois, Chicago
| | - Robert A Gatenby
- Department of Integrated Mathematical Oncology, H Lee Moffitt Cancer Center and Research Institute, Tampa, Florida. Department of Radiology, H Lee Moffitt Cancer Center and Research Institute, Tampa, Florida.
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20
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Wang G, Chen L, Yu B, Zellmer L, Xu N, Liao DJ. Learning about the Importance of Mutation Prevention from Curable Cancers and Benign Tumors. J Cancer 2016; 7:436-45. [PMID: 26918057 PMCID: PMC4749364 DOI: 10.7150/jca.13832] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2015] [Accepted: 12/03/2015] [Indexed: 01/08/2023] Open
Abstract
Some cancers can be cured by chemotherapy or radiotherapy, presumably because they are derived from those cell types that not only can die easily but also have already been equipped with mobility and adaptability, which would later allow the cancers to metastasize without the acquisition of additional mutations. From a viewpoint of biological dispersal, invasive and metastatic cells may, among other possibilities, have been initial losers in the competition for resources with other cancer cells in the same primary tumor and thus have had to look for new habitats in order to survive. If this is really the case, manipulation of their ecosystems, such as by slightly ameliorating their hardship, may prevent metastasis. Since new mutations may occur, especially during and after therapy, to drive progression of cancer cells to metastasis and therapy-resistance, preventing new mutations from occurring should be a key principle for the development of new anticancer drugs. Such new drugs should be able to kill cancer cells very quickly without leaving the surviving cells enough time to develop new mutations and select resistant or metastatic clones. This principle questions the traditional use and the future development of genotoxic drugs for cancer therapy.
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Affiliation(s)
- Gangshi Wang
- 1. Department of Geriatric Gastroenterology, Chinese PLA General Hospital, Beijing 100853, P.R. China
| | - Lichan Chen
- 2. Hormel Institute, University of Minnesota, Austin, MN 55912, USA
| | - Baofa Yu
- 3. Beijing Baofa Cancer Hospital, Shahe Wangzhuang Gong Ye Yuan, Chang Pin Qu, Beijing 102206, P.R. China
| | - Lucas Zellmer
- 2. Hormel Institute, University of Minnesota, Austin, MN 55912, USA
| | - Ningzhi Xu
- 4. Laboratory of Cell and Molecular Biology, Cancer Institute, Chinese Academy of Medical Science, Beijing 100021, P.R. China
| | - D Joshua Liao
- 5. D. Joshua Liao, Clinical Research Center, Guizhou Medical University Hospital, Guizhou, Guiyang 550004, P.R. China
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21
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Aktipis A. Principles of cooperation across systems: from human sharing to multicellularity and cancer. Evol Appl 2015; 9:17-36. [PMID: 27087837 PMCID: PMC4780378 DOI: 10.1111/eva.12303] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Accepted: 08/04/2015] [Indexed: 12/31/2022] Open
Abstract
From cells to societies, several general principles arise again and again that facilitate cooperation and suppress conflict. In this study, I describe three general principles of cooperation and how they operate across systems including human sharing, cooperation in animal and insect societies and the massively large‐scale cooperation that occurs in our multicellular bodies. The first principle is that of Walk Away: that cooperation is enhanced when individuals can leave uncooperative partners. The second principle is that resource sharing is often based on the need of the recipient (i.e., need‐based transfers) rather than on strict account‐keeping. And the last principle is that effective scaling up of cooperation requires increasingly sophisticated and costly cheater suppression mechanisms. By comparing how these principles operate across systems, we can better understand the constraints on cooperation. This can facilitate the discovery of novel ways to enhance cooperation and suppress cheating in its many forms, from social exploitation to cancer.
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Affiliation(s)
- Athena Aktipis
- Department of Psychology Center for Social Dynamics and Complexity Center for Evolution and Medicine Biodesign Institute Arizona State University Tempe AZ USA; Center for Evolution and Cancer University of California San Francisco San Francisco CA USA
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22
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Robertson-Tessi M, Gillies RJ, Gatenby RA, Anderson ARA. Impact of metabolic heterogeneity on tumor growth, invasion, and treatment outcomes. Cancer Res 2015; 75:1567-79. [PMID: 25878146 DOI: 10.1158/0008-5472.can-14-1428] [Citation(s) in RCA: 190] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Histopathologic knowledge that extensive heterogeneity exists between and within tumors has been confirmed and deepened recently by molecular studies. However, the impact of tumor heterogeneity on prognosis and treatment remains as poorly understood as ever. Using a hybrid multiscale mathematical model of tumor growth in vascularized tissue, we investigated the selection pressures exerted by spatial and temporal variations in tumor microenvironment and the resulting phenotypic adaptations. A key component of this model is normal and tumor metabolism and its interaction with microenvironmental factors. The metabolic phenotype of tumor cells is plastic, and microenvironmental selection leads to increased tumor glycolysis and decreased pH. Once this phenotype emerges, the tumor dramatically changes its behavior due to acid-mediated invasion, an effect that depends on both variations in the tumor cell phenotypes and their spatial distribution within the tumor. In early stages of growth, tumors are stratified, with the most aggressive cells developing within the interior of the tumor. These cells then grow to the edge of the tumor and invade into the normal tissue using acidosis. Simulations suggest that diffusible cytotoxic treatments, such as chemotherapy, may increase the metabolic aggressiveness of a tumor due to drug-mediated selection. Chemotherapy removes the metabolic stratification of the tumor and allows more aggressive cells to grow toward blood vessels and normal tissue. Antiangiogenic therapy also selects for aggressive phenotypes due to degradation of the tumor microenvironment, ultimately resulting in a more invasive tumor. In contrast, pH buffer therapy slows down the development of aggressive tumors, but only if administered when the tumor is still stratified. Overall, findings from this model highlight the risks of cytotoxic and antiangiogenic treatments in the context of tumor heterogeneity resulting from a selection for more aggressive behaviors.
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Affiliation(s)
- Mark Robertson-Tessi
- Department of Integrated Mathematical Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida.
| | - Robert J Gillies
- Department of Cancer Imaging and Metabolism, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Robert A Gatenby
- Department of Integrated Mathematical Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida. Department of Cancer Imaging and Metabolism, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Alexander R A Anderson
- Department of Integrated Mathematical Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
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23
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Aktipis CA, Boddy AM, Jansen G, Hibner U, Hochberg ME, Maley CC, Wilkinson GS. Cancer across the tree of life: cooperation and cheating in multicellularity. Philos Trans R Soc Lond B Biol Sci 2015; 370:20140219. [PMID: 26056363 PMCID: PMC4581024 DOI: 10.1098/rstb.2014.0219] [Citation(s) in RCA: 209] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/30/2015] [Indexed: 02/06/2023] Open
Abstract
Multicellularity is characterized by cooperation among cells for the development, maintenance and reproduction of the multicellular organism. Cancer can be viewed as cheating within this cooperative multicellular system. Complex multicellularity, and the cooperation underlying it, has evolved independently multiple times. We review the existing literature on cancer and cancer-like phenomena across life, not only focusing on complex multicellularity but also reviewing cancer-like phenomena across the tree of life more broadly. We find that cancer is characterized by a breakdown of the central features of cooperation that characterize multicellularity, including cheating in proliferation inhibition, cell death, division of labour, resource allocation and extracellular environment maintenance (which we term the five foundations of multicellularity). Cheating on division of labour, exhibited by a lack of differentiation and disorganized cell masses, has been observed in all forms of multicellularity. This suggests that deregulation of differentiation is a fundamental and universal aspect of carcinogenesis that may be underappreciated in cancer biology. Understanding cancer as a breakdown of multicellular cooperation provides novel insights into cancer hallmarks and suggests a set of assays and biomarkers that can be applied across species and characterize the fundamental requirements for generating a cancer.
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Affiliation(s)
- C Athena Aktipis
- Center for Evolution and Cancer, University of California San Francisco, San Francisco, CA 94143, USA Department of Psychology, Arizona State University, Tempe, AZ 85287-4501, USA Centre for Evolution and Cancer, Institute for Cancer Research, 123 Old Brompton Road, London SW7 3RP, UK Institute for Advanced Study, Wissenschaftskolleg zu Berlin, Berlin, Germany
| | - Amy M Boddy
- Center for Evolution and Cancer, University of California San Francisco, San Francisco, CA 94143, USA Department of Psychology, Arizona State University, Tempe, AZ 85287-4501, USA Institute for Advanced Study, Wissenschaftskolleg zu Berlin, Berlin, Germany
| | - Gunther Jansen
- Department of Evolutionary Ecology and Genetics, University of Kiel, Am Botanischen Garten 1-9, 24118 Kiel, Germany Institute for Advanced Study, Wissenschaftskolleg zu Berlin, Berlin, Germany
| | - Urszula Hibner
- CNRS, UMR 5535, Institut de Génétique Moléculaire de Montpellier, Université de Montpellier, Montpellier, France Institute for Advanced Study, Wissenschaftskolleg zu Berlin, Berlin, Germany
| | - Michael E Hochberg
- Institut des Sciences de l'Evolution, CNRS UMR5554, Université Montpellier, 34095 Montpellier, France Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501, USA Institute for Advanced Study, Wissenschaftskolleg zu Berlin, Berlin, Germany
| | - Carlo C Maley
- Center for Evolution and Cancer, University of California San Francisco, San Francisco, CA 94143, USA Centre for Evolution and Cancer, Institute for Cancer Research, 123 Old Brompton Road, London SW7 3RP, UK Biodesign Institute, School of Life Sciences, Arizona State University, PO Box 8724501, Tempe, AZ 85287-4501, USA Institute for Advanced Study, Wissenschaftskolleg zu Berlin, Berlin, Germany
| | - Gerald S Wilkinson
- Department of Biology, University of Maryland, College Park, MD 20742, USA Institute for Advanced Study, Wissenschaftskolleg zu Berlin, Berlin, Germany
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Walther V, Hiley CT, Shibata D, Swanton C, Turner PE, Maley CC. Can oncology recapitulate paleontology? Lessons from species extinctions. Nat Rev Clin Oncol 2015; 12:273-85. [PMID: 25687908 PMCID: PMC4569005 DOI: 10.1038/nrclinonc.2015.12] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Although we can treat cancers with cytotoxic chemotherapies, target them with molecules that inhibit oncogenic drivers, and induce substantial cell death with radiation, local and metastatic tumours recur, resulting in extensive morbidity and mortality. Indeed, driving a tumour to extinction is difficult. Geographically dispersed species of organisms are perhaps equally resistant to extinction, but >99.9% of species that have ever existed on this planet have become extinct. By contrast, we are nowhere near that level of success in cancer therapy. The phenomena are broadly analogous--in both cases, a genetically diverse population mutates and evolves through natural selection. The goal of cancer therapy is to cause cancer cell population extinction, or at least to limit any further increase in population size, to prevent the tumour burden from overwhelming the patient. However, despite available treatments, complete responses are rare, and partial responses are limited in duration. Many patients eventually relapse with tumours that evolve from cells that survive therapy. Similarly, species are remarkably resilient to environmental change. Paleontology can show us the conditions that lead to extinction and the characteristics of species that make them resistant to extinction. These lessons could be translated to improve cancer therapy and prognosis.
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Affiliation(s)
- Viola Walther
- Evolution and Cancer Laboratory, Barts Cancer Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK
| | - Crispin T Hiley
- Translational Cancer Therapeutics Laboratory, Cancer Research UK London Research Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK
| | - Darryl Shibata
- Department of Pathology, USC Keck School of Medicine, Hoffman Medical Research Center 211, 2011 Zonal Avenue, Los Angeles, CA 90089-9092, USA
| | - Charles Swanton
- Translational Cancer Therapeutics Laboratory, Cancer Research UK London Research Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK
| | - Paul E Turner
- Department of Ecology and Evolutionary Biology, Yale University, 165 Prospect Street, New Haven, CT 06511, USA
| | - Carlo C Maley
- Center for Evolution and Cancer, Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, 2340 Sutter Street, San Francisco, CA 94143, USA
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25
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Kareva I. Immune evasion through competitive inhibition: the shielding effect of cancer non-stem cells. J Theor Biol 2014; 364:40-8. [PMID: 25195001 DOI: 10.1016/j.jtbi.2014.08.035] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 08/08/2014] [Accepted: 08/19/2014] [Indexed: 01/07/2023]
Abstract
It has been recently proposed that the two emerging hallmarks of cancer, namely altered glucose metabolism and immune evasion, may in fact be fundamentally linked. This connection comes from up-regulation of glycolysis by tumor cells, which can lead to active competition for resources in the tumor microenvironment between tumor and immune cells. Here it is further proposed that cancer stem cells (CSCs) can circumvent the anti-tumor immune response by creating a "protective shield" of non-stem cancer cells around them. This shield can protect the CSCs both by creating a physical barrier between them and cytotoxic lymphocytes (CTLs), and by promoting competition for the common resources, such as glucose, between non-stem cancer cells and CTLs. The implications of this hypothesis are investigated using an agent-based model, leading to a prediction that relative CSC to non-CSC ratio will vary depending on the strength of the host immune response. A discussion of possible therapeutic approaches concludes the paper, suggesting that a chemotherapeutic regimen consisting of regular pulsed doses, i.e., metronomic chemotherapy, would yield the best clinical outcome by removing the "protective shield" and thus allowing CTLs to most effectively reach and eliminate CSCs.
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Affiliation(s)
- Irina Kareva
- Newman Lakka Institute, Floating Hospital for Children at Tufts Medical Center, Boston, MA 02111, United States
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26
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Uppal A, Wightman SC, Ganai S, Weichselbaum RR, An G. Investigation of the essential role of platelet-tumor cell interactions in metastasis progression using an agent-based model. Theor Biol Med Model 2014; 11:17. [PMID: 24725600 PMCID: PMC4022382 DOI: 10.1186/1742-4682-11-17] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 04/04/2014] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Metastatic tumors are a major source of morbidity and mortality for most cancers. Interaction of circulating tumor cells with endothelium, platelets and neutrophils play an important role in the early stages of metastasis formation. These complex dynamics have proven difficult to study in experimental models. Prior computational models of metastases have focused on tumor cell growth in a host environment, or prediction of metastasis formation from clinical data. We used agent-based modeling (ABM) to dynamically represent hypotheses of essential steps involved in circulating tumor cell adhesion and interaction with other circulating cells, examine their functional constraints, and predict effects of inhibiting specific mechanisms. METHODS We developed an ABM of Early Metastasis (ABMEM), a descriptive semi-mechanistic model that replicates experimentally observed behaviors of populations of circulating tumor cells, neutrophils, platelets and endothelial cells while incorporating representations of known surface receptor, autocrine and paracrine interactions. Essential downstream cellular processes were incorporated to simulate activation in response to stimuli, and calibrated with experimental data. The ABMEM was used to identify potential points of interdiction through examination of dynamic outcomes such as rate of tumor cell binding after inhibition of specific platelet or tumor receptors. RESULTS The ABMEM reproduced experimental data concerning neutrophil rolling over endothelial cells, inflammation-induced binding between neutrophils and platelets, and tumor cell interactions with these cells. Simulated platelet inhibition with anti-platelet drugs produced unstable aggregates with frequent detachment and re-binding. The ABMEM replicates findings from experimental models of circulating tumor cell adhesion, and suggests platelets play a critical role in this pre-requisite for metastasis formation. Similar effects were observed with inhibition of tumor integrin αV/β3. These findings suggest that anti-platelet or anti-integrin therapies may decrease metastasis by preventing stable circulating tumor cell adhesion. CONCLUSION Circulating tumor cell adhesion is a complex, dynamic process involving multiple cell-cell interactions. The ABMEM successfully captures the essential interactions necessary for this process, and allows for in-silico iterative characterization and invalidation of proposed hypotheses regarding this process in conjunction with in-vitro and in-vivo models. Our results suggest that anti-platelet therapies and anti-integrin therapies may play a promising role in inhibiting metastasis formation.
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Affiliation(s)
| | | | | | | | - Gary An
- Department of Surgery, The University of Chicago Medicine, 5841 S, Maryland Avenue, MC 5094 S-032, Chicago, IL 60637, USA.
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27
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Abstract
Somatic evolution during cancer progression and therapy results in tumour cells that show a wide range of phenotypes, which include rapid proliferation and quiescence. Evolutionary life history theory may help us to understand the diversity of these phenotypes. Fast life history organisms reproduce rapidly, whereas those with slow life histories show less fecundity and invest more resources in survival. Life history theory also provides an evolutionary framework for phenotypic plasticity, which has potential implications for understanding 'cancer stem cells'. Life history theory suggests that different therapy dosing schedules might select for fast or slow life history cell phenotypes, with important clinical consequences.
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Affiliation(s)
- C Athena Aktipis
- 1] Center for Evolution and Cancer and the Department of Surgery, University of California San Francisco, 2340 Sutter Street, BOX 1351, San Francisco, California 94143-1351, USA. [2] Department of Psychology, Arizona State University, PO Box 871104, Tempe, Arizona 85287-1104, USA
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28
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Orlando PA, Gatenby RA, Brown JS. Tumor evolution in space: the effects of competition colonization tradeoffs on tumor invasion dynamics. Front Oncol 2013; 3:45. [PMID: 23508890 PMCID: PMC3589695 DOI: 10.3389/fonc.2013.00045] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 02/20/2013] [Indexed: 01/06/2023] Open
Abstract
We apply competition colonization tradeoff models to tumor growth and invasion dynamics to explore the hypothesis that varying selection forces will result in predictable phenotypic differences in cells at the tumor invasive front compared to those in the core. Spatially, ecologically, and evolutionarily explicit partial differential equation models of tumor growth confirm that spatial invasion produces selection pressure for motile phenotypes. The effects of the invasive phenotype on normal adjacent tissue determine the patterns of growth and phenotype distribution. If tumor cells do not destroy their environment, colonizer and competitive phenotypes coexist with the former localized at the invasion front and the latter, to the tumor interior. If tumors cells do destroy their environment, then cell motility is strongly selected resulting in accelerated invasion speed with time. Our results suggest that the widely observed genetic heterogeneity within cancers may not be the stochastic effect of random mutations. Rather, it may be the consequence of predictable variations in environmental selection forces and corresponding phenotypic adaptations.
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Affiliation(s)
- Paul A Orlando
- Biometry Research Group, Division of Cancer Prevention, National Cancer Institute Rockville, MD, USA
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29
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Baker AM, Graham TA, Wright NA. Pre-tumour clones, periodic selection and clonal interference in the origin and progression of gastrointestinal cancer: potential for biomarker development. J Pathol 2013; 229:502-14. [PMID: 23288692 DOI: 10.1002/path.4157] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 12/17/2012] [Accepted: 12/18/2012] [Indexed: 12/18/2022]
Abstract
Classically, the risk of cancer progression in premalignant conditions of the gastrointestinal tract is assessed by examining the degree of histological dysplasia. However, there are many putative pro-cancer genetic changes that have occurred in histologically normal tissue well before the onset of dysplasia. Here we summarize the evidence for such pre-tumour clones and the existing technology that can be used to locate these clones and characterize them at the genetic level. We also discuss the mechanisms by which pre-tumour clones may spread through large areas of normal tissue, and highlight emerging theories on how multiple clones compete and interact within the gastrointestinal mucosa. It is important to gain an understanding of these processes, as it is envisaged that certain pre-tumour changes may be powerful predictive markers, with the potential to identify patients at high risk of developing cancer at a much earlier stage.
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Affiliation(s)
- Ann-Marie Baker
- Centre for Tumour Biology, Barts and the London School of Medicine and Dentistry, London, UK.
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30
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Taylor TB, Johnson LJ, Jackson RW, Brockhurst MA, Dash PR. First steps in experimental cancer evolution. Evol Appl 2013; 6:535-48. [PMID: 23745144 PMCID: PMC3673480 DOI: 10.1111/eva.12041] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Accepted: 11/23/2012] [Indexed: 12/20/2022] Open
Abstract
Evolutionary processes play a central role in the development, progression and response to treatment of cancers. The current challenge facing researchers is to harness evolutionary theory to further our understanding of the clinical progression of cancers. Central to this endeavour will be the development of experimental systems and approaches by which theories of cancer evolution can be effectively tested. We argue here that the experimental evolution approach - whereby evolution is observed in real time and which has typically employed microorganisms - can be usefully applied to cancer. This approach allows us to disentangle the ecological causes of natural selection, identify the genetic basis of evolutionary changes and determine their repeatability. Cell cultures used in cancer research share many of the desirable traits that make microorganisms ideal for studying evolution. As such, experimental cancer evolution is feasible and likely to give great insight into the selective pressures driving the evolution of clinically destructive cancer traits. We highlight three areas of evolutionary theory with importance to cancer biology that are amenable to experimental evolution: drug resistance, social evolution and resource competition. Understanding the diversity, persistence and evolution of cancers is vital for treatment and drug development, and an experimental evolution approach could provide strategic directions and focus for future research.
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31
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Aktipis CA, Nesse RM. Evolutionary foundations for cancer biology. Evol Appl 2013; 6:144-59. [PMID: 23396885 PMCID: PMC3567479 DOI: 10.1111/eva.12034] [Citation(s) in RCA: 142] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Accepted: 10/12/2012] [Indexed: 12/16/2022] Open
Abstract
New applications of evolutionary biology are transforming our understanding of cancer. The articles in this special issue provide many specific examples, such as microorganisms inducing cancers, the significance of within-tumor heterogeneity, and the possibility that lower dose chemotherapy may sometimes promote longer survival. Underlying these specific advances is a large-scale transformation, as cancer research incorporates evolutionary methods into its toolkit, and asks new evolutionary questions about why we are vulnerable to cancer. Evolution explains why cancer exists at all, how neoplasms grow, why cancer is remarkably rare, and why it occurs despite powerful cancer suppression mechanisms. Cancer exists because of somatic selection; mutations in somatic cells result in some dividing faster than others, in some cases generating neoplasms. Neoplasms grow, or do not, in complex cellular ecosystems. Cancer is relatively rare because of natural selection; our genomes were derived disproportionally from individuals with effective mechanisms for suppressing cancer. Cancer occurs nonetheless for the same six evolutionary reasons that explain why we remain vulnerable to other diseases. These four principles-cancers evolve by somatic selection, neoplasms grow in complex ecosystems, natural selection has shaped powerful cancer defenses, and the limitations of those defenses have evolutionary explanations-provide a foundation for understanding, preventing, and treating cancer.
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Affiliation(s)
- C Athena Aktipis
- Center for Evolution and Cancer, University of California San Francisco, CA, USA ; Department of Psychology, Arizona State University Tempe, AZ, USA
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32
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Baker SG. Paradoxes in Carcinogenesis Should Spur New Avenues of Research: An Historical Perspective. ACTA ACUST UNITED AC 2012. [DOI: 10.1089/dst.2012.0011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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33
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Ewald PW, Swain Ewald HA. Infection, mutation, and cancer evolution. J Mol Med (Berl) 2012; 90:535-41. [PMID: 22476248 DOI: 10.1007/s00109-012-0891-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 03/03/2012] [Accepted: 03/07/2012] [Indexed: 01/27/2023]
Abstract
An understanding of oncogenesis can be fostered by an integration of mechanistic studies with evolutionary considerations, which help explain why these mechanisms occur. This integration emphasizes infections and mutations as joint essential causes for many cancers. It suggests that infections may play a broader causal role in oncogenesis than has been generally appreciated. An evolutionary perspective also suggests that oncogenic viruses will tend to be transmitted by routes that provide infrequent opportunities for transmission, such as transmission by sexual and salivary contact. Such routes increase the intensity of natural selection for persistence within hosts, and molecular mechanisms for persistence often compromise critical barriers to oncogenesis, particularly cell cycle arrest, apoptosis, and a cap on the total number of divisions that a cell can undergo.
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Affiliation(s)
- Paul W Ewald
- Department of Biology, University of Louisville, Louisville, KY 40292, USA.
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