1
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Ribatti D. Aberrant tumor vasculature. Facts and pitfalls. Front Pharmacol 2024; 15:1384721. [PMID: 38576482 PMCID: PMC10991687 DOI: 10.3389/fphar.2024.1384721] [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: 02/10/2024] [Accepted: 03/11/2024] [Indexed: 04/06/2024] Open
Abstract
Endothelial cells form a single cell layer lining the inner walls of blood vessels and play critical roles in organ homeostasis and disease progression. Specifically, tumor endothelial cells are heterogenous, and highly permeable, because of specific interactions with the tumor tissue environment and through soluble factors and cell-cell interactions. This review article aims to analyze different aspects of endothelial cell heterogeneity in tumor vasculature, with particular emphasis on vascular normalization, vascular permeability, metabolism, endothelial-to-mesenchymal transition, resistance to therapy, and the interplay between endothelial cells and the immune system.
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Affiliation(s)
- Domenico Ribatti
- Department of Translational Biomedicine and Neuroscience, University of Bari Medical School, Bari, Italy
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2
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Yao X, Zeng Y. Tumour associated endothelial cells: origin, characteristics and role in metastasis and anti-angiogenic resistance. Front Physiol 2023; 14:1199225. [PMID: 37389120 PMCID: PMC10301839 DOI: 10.3389/fphys.2023.1199225] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 05/23/2023] [Indexed: 07/01/2023] Open
Abstract
Tumour progression and metastasis remain the leading causes of cancer-related death worldwide. Tumour angiogenesis is essential for tumour progression. The vasculature surrounding tumours is not only a transport channel for nutrients, oxygen, and metabolites, but also a pathway for metastasis. There is a close interaction between tumour cells and endothelial cells in the tumour microenvironment. Recent studies have shown that tumour-associated endothelial cells have different characteristics from normal vascular endothelial cells, play an important role in tumour progression and metastasis, and are expected to be a key target for cancer therapy. This article reviews the tissue and cellular origin of tumour-associated endothelial cells and analyses the characteristics of tumour-associated endothelial cells. Finally, it summarises the role of tumour-associated endothelial cells in tumour progression and metastasis and the prospects for their use in clinical anti-angiogenic therapy.
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Affiliation(s)
- Xinghong Yao
- Radiation Oncology Key Laboratory of Sichuan Province, Department of Radiotherapy, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital and Institute, Sichuan Cancer Center, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, China
| | - Ye Zeng
- Institute of Biomedical Engineering, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
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3
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Asl ER, Rostamzadeh D, Duijf PHG, Mafi S, Mansoori B, Barati S, Cho WC, Mansoori B. Mutant P53 in the formation and progression of the tumor microenvironment: Friend or foe. Life Sci 2023; 315:121361. [PMID: 36608871 DOI: 10.1016/j.lfs.2022.121361] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 12/20/2022] [Accepted: 12/29/2022] [Indexed: 01/07/2023]
Abstract
TP53 is the most frequently mutated gene in human cancer. It encodes the tumor suppressor protein p53, which suppresses tumorigenesis by acting as a critical transcription factor that can induce the expression of many genes controlling a plethora of fundamental cellular processes, including cell cycle progression, survival, apoptosis, and DNA repair. Missense mutations are the most frequent type of mutations in the TP53 gene. While these can have variable effects, they typically impair p53 function in a dominant-negative manner, thereby altering intra-cellular signaling pathways and promoting cancer development. Additionally, it is becoming increasingly apparent that p53 mutations also have non-cell autonomous effects that influence the tumor microenvironment (TME). The TME is a complex and heterogeneous milieu composed of both malignant and non-malignant cells, including cancer-associated fibroblasts (CAFs), adipocytes, pericytes, different immune cell types, such as tumor-associated macrophages (TAMs) and T and B lymphocytes, as well as lymphatic and blood vessels and extracellular matrix (ECM). Recently, a large body of evidence has demonstrated that various types of p53 mutations directly affect TME. They fine-tune the inflammatory TME and cell fate reprogramming, which affect cancer progression. Notably, re-educating the p53 signaling pathway in the TME may be an effective therapeutic strategy in combating cancer. Therefore, it is timely to here review the recent advances in our understanding of how TP53 mutations impact the fate of cancer cells by reshaping the TME.
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Affiliation(s)
- Elmira Roshani Asl
- Department of Biochemistry, Saveh University of Medical Sciences, Saveh, Iran
| | - Davoud Rostamzadeh
- Department of Clinical Biochemistry, Yasuj University of Medical Sciences, Yasuj, Iran; Medicinal Plants Research Center, Yasuj University of Medical Sciences, Yasuj, Iran
| | - Pascal H G Duijf
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, QLD, Australia; Centre for Genomics and Personalised Health, Queensland University of Technology, Brisbane, QLD, Australia; Centre for Data Science, Queensland University of Technology, Brisbane, QLD, Australia; Cancer and Aging Research Program, Queensland University of Technology, Brisbane, QLD, Australia; Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway; Department of Medical Genetics, Oslo University Hospital, Oslo, Norway
| | - Sahar Mafi
- Department of Clinical Biochemistry, Yasuj University of Medical Sciences, Yasuj, Iran; Medicinal Plants Research Center, Yasuj University of Medical Sciences, Yasuj, Iran
| | - Behnaz Mansoori
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Shirin Barati
- Department of Anatomy, Saveh University of Medical Sciences, Saveh, Iran
| | - William C Cho
- Department of Clinical Oncology, Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - Behzad Mansoori
- The Wistar Institute, Molecular & Cellular Oncogenesis Program, Philadelphia, PA, United States.
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4
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Li H, Cheng Z, Yang P, Huang W, Li X, Xiang D, Wu X. Endothelial Nogo-B Suppresses Cancer Cell Proliferation via a Paracrine TGF-β/Smad Signaling. Cells 2022; 11:cells11193084. [PMID: 36231046 PMCID: PMC9564156 DOI: 10.3390/cells11193084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Revised: 09/12/2022] [Accepted: 09/20/2022] [Indexed: 11/20/2022] Open
Abstract
Nogo-B has been reported to play a critical role in angiogenesis and the repair of damaged blood vessels; however, its role in the tumor microenvironment remains unclear. Here, we observed the differential expression of Nogo-B in endothelial cells from hepatocellular carcinoma (HCC) and glioma samples. Downregulation of Nogo-B expression correlated with the malignant phenotype of cancer and a poor prognosis for patients. In subsequent studies, endothelial Nogo-B inhibition robustly promoted the growth of HCC or glioma xenografts in nude mice. Intriguingly, endothelial Nogo-B silencing dramatically suppressed endothelial cell expansion and tumor angiogenesis, but potently enhanced the proliferation of neighboring HCC and glioma cells. Based on the results of the ELISA assay, Nogo-B silencing reduced TGF-β production in endothelial cells, which attenuated the phosphorylation and nuclear translocation of Smad in neighboring cancer cells. The endothelial Nogo-B silencing-mediated increase in cancer cell proliferation was abolished by either a TGF-β neutralizing antibody or TGF-β receptor inhibitor, indicating the essential role for TGF-β in endothelial Nogo-B-mediated suppression of cancer growth. These findings not only broaden our understanding of the crosstalk between cancer cells and endothelial cells but also provide a novel prognostic biomarker and a therapeutic target for cancer treatments.
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Affiliation(s)
- Hengyu Li
- Department of Breast and Thyroid Surgery, Changhai Hospital, Naval Military Medical University, Shanghai 200433, China
- Correspondence: (H.L.); (X.L.); (D.X.); (X.W.)
| | - Zhuo Cheng
- Department of Oncology, Third Affiliated Hospital of Naval Military Medical University, Shanghai 200438, China
| | - Pinghua Yang
- Department of Hepatic Surgery, Third Affiliated Hospital of Naval Military Medical University, Shanghai 200438, China
| | - Wei Huang
- Department of Neurosurgery, The First People’s Hospital of Yunnan Province, Kunming 650032, China
| | - Xizhou Li
- Department of Breast and Thyroid Surgery, Changhai Hospital, Naval Military Medical University, Shanghai 200433, China
- Correspondence: (H.L.); (X.L.); (D.X.); (X.W.)
| | - Daimin Xiang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
- Correspondence: (H.L.); (X.L.); (D.X.); (X.W.)
| | - Xiaojun Wu
- Department of Neurosurgery, Fudan University Shanghai Cancer Center, Shanghai 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China
- Correspondence: (H.L.); (X.L.); (D.X.); (X.W.)
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5
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Tang Y, Yu Z, Lu X, Fan Q, Huang W. Overcoming Vascular Barriers to Improve the Theranostic Outcomes of Nanomedicines. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103148. [PMID: 35246962 PMCID: PMC9069202 DOI: 10.1002/advs.202103148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 02/16/2022] [Indexed: 05/04/2023]
Abstract
Nanotheranostics aims to utilize nanomaterials to prevent, diagnose, and treat diseases to improve the quality of patients' lives. Blood vessels are responsible to deliver nutrients and oxygen to the whole body, eliminate waste, and provide access for patrolling immune cells for healthy tissues. Meanwhile, they can also nourish disease tissues, spread disease factors or cells into other healthy tissues, and deliver nanotheranostic agents to cover all the regions of a disease tissue. Thus, blood vessels are the first and the most important barrier for highly efficient nanotheranostics. Here, the structure and function of blood vessels are explored and how these characteristics affect nanotheranostics is discussed. Moreover, new mechanisms and related strategies about overcoming vascular obstacles for improved nanotheranostic outcomes are critically summarized, and their merits and demerits of each strategy are analyzed. Moreover, the present challenges to completely exhibit the potential of overcoming vascular barriers to improve the theranostic outcomes of nanomedicines in life science are also discussed. Finally, the future perspective is further discussed.
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Affiliation(s)
- Yufu Tang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM)Nanjing Tech University30 South Puzhu RoadNanjing211800P. R. China
| | - Zhongzheng Yu
- School of Chemical and Biomedical EngineeringNanyang Technological UniversitySingapore637459Singapore
| | - Xiaomei Lu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM)Nanjing Tech University30 South Puzhu RoadNanjing211800P. R. China
| | - Quli Fan
- Key Laboratory for Organic Electronics and Information Displays and Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Nanjing University of Posts and TelecommunicationsNanjing210023China
- Shaanxi Institute of Flexible Electronics (SIFE)Northwestern Polytechnical University (NPU)Xi'an710072China
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM)Nanjing Tech University30 South Puzhu RoadNanjing211800P. R. China
- Key Laboratory for Organic Electronics and Information Displays and Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Nanjing University of Posts and TelecommunicationsNanjing210023China
- Shaanxi Institute of Flexible Electronics (SIFE)Northwestern Polytechnical University (NPU)Xi'an710072China
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6
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Tumor Endothelial Cell-A Biological Tool for Translational Cancer Research. Int J Mol Sci 2020; 21:ijms21093238. [PMID: 32375250 PMCID: PMC7247330 DOI: 10.3390/ijms21093238] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 04/29/2020] [Accepted: 04/30/2020] [Indexed: 12/14/2022] Open
Abstract
Going from bench to bedside is a simplified description of translational research, with the ultimate goal being to improve the health status of mankind. Tumor endothelial cells (TECs) perform angiogenesis to support the growth, establishment, and dissemination of tumors to distant organs. TECs have various features that distinguish them from normal endothelial cells, which include alterations in gene expression patterns, higher angiogenic and metabolic activities, and drug resistance tendencies. The special characteristics of TECs enhance the vulnerability of tumor blood vessels toward antiangiogenic therapeutic strategies. Therefore, apart from being a viable therapeutic target, TECs would act as a better mediator between the bench (i.e., angiogenesis research) and the bedside (i.e., clinical application of drugs discovered through research). Exploitation of TEC characteristics could reveal unidentified strategies of enhancing and monitoring antiangiogenic therapy in the treatment of cancer, which are discussed in this review.
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7
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Tansi FL, Rüger R, Kollmeier AM, Rabenhold M, Steiniger F, Kontermann RE, Teichgräber UK, Fahr A, Hilger I. Targeting the Tumor Microenvironment with Fluorescence-Activatable Bispecific Endoglin/Fibroblast Activation Protein Targeting Liposomes. Pharmaceutics 2020; 12:pharmaceutics12040370. [PMID: 32316521 PMCID: PMC7238156 DOI: 10.3390/pharmaceutics12040370] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 04/06/2020] [Accepted: 04/14/2020] [Indexed: 11/25/2022] Open
Abstract
Liposomes are biocompatible nanocarriers with promising features for targeted delivery of contrast agents and drugs into the tumor microenvironment, for imaging and therapy purposes. Liposome-based simultaneous targeting of tumor associated fibroblast and the vasculature is promising, but the heterogeneity of tumors entails a thorough validation of suitable markers for targeted delivery. Thus, we elucidated the potential of bispecific liposomes targeting the fibroblast activation protein (FAP) on tumor stromal fibroblasts, together with endoglin which is overexpressed on tumor neovascular cells and some neoplastic cells. Fluorescence-quenched liposomes were prepared by hydrating a lipid film with a high concentration of the self-quenching near-infrared fluorescent dye, DY-676-COOH, to enable fluorescence detection exclusively upon liposomal degradation and subsequent activation. A non-quenched green fluorescent phospholipid was embedded in the liposomal surface to fluorescence-track intact liposomes. FAP- and murine endoglin-specific single chain antibody fragments were coupled to the liposomal surface, and the liposomal potentials validated in tumor cells and mice models. The bispecific liposomes revealed strong fluorescence quenching, activatability, and selectivity for target cells and delivered the encapsulated dye selectively into tumor vessels and tumor associated fibroblasts in xenografted mice models and enabled their fluorescence imaging. Furthermore, detection of swollen lymph nodes during intra-operative simulations was possible. Thus, the bispecific liposomes have potentials for targeted delivery into the tumor microenvironment and for image-guided surgery.
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Affiliation(s)
- Felista L. Tansi
- Department of Experimental Radiology, Institute of Diagnostic and Interventional Radiology, Jena University Hospital-Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany; (A.M.K.); (U.K.T.)
- Correspondence: (F.L.T.); (R.R.); (I.H.); Tel.: +49-3641-9324993 (F.L.T.); +49-3641-949905 (R.R.); +49-3641-9325921 (I.H.)
| | - Ronny Rüger
- Department of Pharmaceutical Technology, Friedrich-Schiller-University Jena, Lessingstrasse 8, 07743 Jena, Germany (A.F.)
- Correspondence: (F.L.T.); (R.R.); (I.H.); Tel.: +49-3641-9324993 (F.L.T.); +49-3641-949905 (R.R.); +49-3641-9325921 (I.H.)
| | - Ansgar M. Kollmeier
- Department of Experimental Radiology, Institute of Diagnostic and Interventional Radiology, Jena University Hospital-Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany; (A.M.K.); (U.K.T.)
| | - Markus Rabenhold
- Department of Pharmaceutical Technology, Friedrich-Schiller-University Jena, Lessingstrasse 8, 07743 Jena, Germany (A.F.)
| | - Frank Steiniger
- Center for Electron Microscopy, Jena University Hospital-Friedrich Schiller University Jena, Ziegelmuehlenweg 1, 07743 Jena, Germany;
| | - Roland E. Kontermann
- Institute of Cell Biology and Immunology, University Stuttgart, Allmandring 31, 70569 Stuttgart, Germany;
| | - Ulf K. Teichgräber
- Department of Experimental Radiology, Institute of Diagnostic and Interventional Radiology, Jena University Hospital-Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany; (A.M.K.); (U.K.T.)
| | - Alfred Fahr
- Department of Pharmaceutical Technology, Friedrich-Schiller-University Jena, Lessingstrasse 8, 07743 Jena, Germany (A.F.)
| | - Ingrid Hilger
- Department of Experimental Radiology, Institute of Diagnostic and Interventional Radiology, Jena University Hospital-Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany; (A.M.K.); (U.K.T.)
- Correspondence: (F.L.T.); (R.R.); (I.H.); Tel.: +49-3641-9324993 (F.L.T.); +49-3641-949905 (R.R.); +49-3641-9325921 (I.H.)
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8
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Baghban R, Roshangar L, Jahanban-Esfahlan R, Seidi K, Ebrahimi-Kalan A, Jaymand M, Kolahian S, Javaheri T, Zare P. Tumor microenvironment complexity and therapeutic implications at a glance. Cell Commun Signal 2020; 18:59. [PMID: 32264958 PMCID: PMC7140346 DOI: 10.1186/s12964-020-0530-4] [Citation(s) in RCA: 864] [Impact Index Per Article: 216.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 02/05/2020] [Indexed: 02/07/2023] Open
Abstract
The dynamic interactions of cancer cells with their microenvironment consisting of stromal cells (cellular part) and extracellular matrix (ECM) components (non-cellular) is essential to stimulate the heterogeneity of cancer cell, clonal evolution and to increase the multidrug resistance ending in cancer cell progression and metastasis. The reciprocal cell-cell/ECM interaction and tumor cell hijacking of non-malignant cells force stromal cells to lose their function and acquire new phenotypes that promote development and invasion of tumor cells. Understanding the underlying cellular and molecular mechanisms governing these interactions can be used as a novel strategy to indirectly disrupt cancer cell interplay and contribute to the development of efficient and safe therapeutic strategies to fight cancer. Furthermore, the tumor-derived circulating materials can also be used as cancer diagnostic tools to precisely predict and monitor the outcome of therapy. This review evaluates such potentials in various advanced cancer models, with a focus on 3D systems as well as lab-on-chip devices. Video abstract.
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Affiliation(s)
- Roghayyeh Baghban
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Medical Biotechnology, School of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Leila Roshangar
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Rana Jahanban-Esfahlan
- Department of Medical Biotechnology, School of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Khaled Seidi
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Student Research Committees, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Abbas Ebrahimi-Kalan
- Department of Neurosciences and Cognitive, School of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mehdi Jaymand
- Nano Drug Delivery Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Saeed Kolahian
- Department of Experimental and Clinical Pharmacology and Pharmacogenomics, University Hospital Tuebingen, Tuebingen, Germany
| | - Tahereh Javaheri
- Health Informatics Lab, Metropolitan College, Boston University, Boston, USA
| | - Peyman Zare
- Dioscuri Center of Chromatin Biology and Epigenomics, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
- Faculty of Medicine, Cardinal Stefan Wyszyński University in Warsaw, 01-938 Warsaw, Poland
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9
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Bittner KR, Jiménez JM, Peyton SR. Vascularized Biomaterials to Study Cancer Metastasis. Adv Healthc Mater 2020; 9:e1901459. [PMID: 31977160 PMCID: PMC7899188 DOI: 10.1002/adhm.201901459] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 12/07/2019] [Indexed: 12/15/2022]
Abstract
Cancer metastasis, the spread of cancer cells to distant organs, is responsible for 90% of cancer-related deaths. Cancer cells need to enter and exit circulation in order to form metastases, and the vasculature and endothelial cells are key regulators of this process. While vascularized 3D in vitro systems have been developed, few have been used to study cancer, and many lack key features of vessels that are necessary to study metastasis. This review focuses on current methods of vascularizing biomaterials for the study of cancer, and three main factors that regulate intravasation and extravasation: endothelial cell heterogeneity, hemodynamics, and the extracellular matrix of the perivascular niche.
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Affiliation(s)
- Katharine R Bittner
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, MA, 01003, USA
| | - Juan M Jiménez
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, MA, 01003, USA
- Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Shelly R Peyton
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, MA, 01003, USA
- Department of Chemical Engineering, University of Massachusetts, Amherst, MA, 01003, USA
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10
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Barravecchia I, Mariotti S, Pucci A, Scebba F, De Cesari C, Bicciato S, Tagliafico E, Tenedini E, Vindigni C, Cecchini M, Berti G, Vitiello M, Poliseno L, Mazzanti CM, Angeloni D. MICAL2 is expressed in cancer associated neo-angiogenic capillary endothelia and it is required for endothelial cell viability, motility and VEGF response. Biochim Biophys Acta Mol Basis Dis 2019; 1865:2111-2124. [PMID: 31004710 DOI: 10.1016/j.bbadis.2019.04.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 03/31/2019] [Accepted: 04/11/2019] [Indexed: 12/22/2022]
Abstract
The capacity of inducing angiogenesis is a recognized hallmark of cancer cells. The cancer microenvironment, characterized by hypoxia and inflammatory signals, promotes proliferation, migration and activation of quiescent endothelial cells (EC) from surrounding vascular network. Current anti-angiogenic drugs present side effects, temporary efficacy, and issues of primary resistance, thereby calling for the identification of new therapeutic targets. MICALs are a unique family of redox enzymes that destabilize F-actin in cytoskeletal dynamics. MICAL2 mediates Semaphorin3A-NRP2 response to VEGFR1 in rat ECs. MICAL2 also enters the p130Cas interactome in response to VEGF in HUVEC. Previously, we showed that MICAL2 is overexpressed in metastatic cancer. A small-molecule inhibitor of MICAL2 exists (CCG-1423). Here we report that 1) MICAL2 is expressed in neo-angiogenic ECs in human solid tumors (kidney and breast carcinoma, glioblastoma and cardiac myxoma, n = 67, were analyzed with immunohistochemistry) and in animal models of ischemia/inflammation neo-angiogenesis, but not in normal capillary bed; 2) MICAL2 protein pharmacological inhibition (CCG-1423) or gene KD reduce EC viability and functional performance; 3) MICAL2 KD disables ECs response to VEGF in vitro. Whole-genome gene expression profiling reveals MICAL2 involvement in angiogenesis and vascular development pathways. Based on these results, we propose that MICAL2 expression in ECs participates to inflammation-induced neo-angiogenesis and that MICAL2 inhibition should be tested in cancer- and noncancer-associated neo-angiogenesis, where chronic inflammation represents a relevant pathophysiological mechanism.
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Affiliation(s)
- Ivana Barravecchia
- Scuola Superiore Sant'Anna, Institute of Life Sciences, 56124 Pisa, Italy; University of Pisa, Pisa, Italy.
| | - Sara Mariotti
- Scuola Superiore Sant'Anna, Institute of Life Sciences, 56124 Pisa, Italy
| | - Angela Pucci
- U.O.C. Anatomia Patologica, Azienda Ospedaliera Universitaria Pisana, 56100 Pisa, Italy
| | - Francesca Scebba
- Scuola Superiore Sant'Anna, Institute of Life Sciences, 56124 Pisa, Italy.
| | - Chiara De Cesari
- Scuola Superiore Sant'Anna, Institute of Life Sciences, 56124 Pisa, Italy.
| | - Silvio Bicciato
- Center for Genome Research, University of Modena and Reggio Emilia, 41125 Modena, Italy.
| | - Enrico Tagliafico
- Center for Genome Research, University of Modena and Reggio Emilia, 41125 Modena, Italy.
| | - Elena Tenedini
- Center for Genome Research, University of Modena and Reggio Emilia, 41125 Modena, Italy.
| | - Carla Vindigni
- U.O.C. Anatomia Patologica, Azienda Ospedaliera Universitaria Senese, Policlinico Le Scotte, 53100 Siena, Italy
| | - Marco Cecchini
- Institute of Nanoscience, National Research Council, 56127 Pisa, Italy.
| | - Gabriele Berti
- Scuola Superiore Sant'Anna, Institute of Life Sciences, 56124 Pisa, Italy; University of Pisa, Pisa, Italy.
| | - Marianna Vitiello
- Oncogenomics Unit, Core Research Laboratory, ISPRO, Institute of Clinical Physiology, National Research Council, 56124 Pisa, Italy.
| | - Laura Poliseno
- Oncogenomics Unit, Core Research Laboratory, ISPRO, Institute of Clinical Physiology, National Research Council, 56124 Pisa, Italy
| | | | - Debora Angeloni
- Scuola Superiore Sant'Anna, Institute of Life Sciences, 56124 Pisa, Italy.
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11
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Zanotelli MR, Reinhart-King CA. Mechanical Forces in Tumor Angiogenesis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1092:91-112. [PMID: 30368750 PMCID: PMC6986816 DOI: 10.1007/978-3-319-95294-9_6] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A defining hallmark of cancer and cancer development is upregulated angiogenesis. The vasculature formed in tumors is structurally abnormal, not organized in the conventional hierarchical arrangement, and more permeable than normal vasculature. These features contribute to leaky, tortuous, and dilated blood vessels, which act to create heterogeneous blood flow, compression of vessels, and elevated interstitial fluid pressure. As such, abnormalities in the tumor vasculature not only affect the delivery of nutrients and oxygen to the tumor, but also contribute to creating an abnormal tumor microenvironment that further promotes tumorigenesis. The role of chemical signaling events in mediating tumor angiogenesis has been well researched; however, the relative contribution of physical cues and mechanical regulation of tumor angiogenesis is less understood. Growing research indicates that the physical microenvironment plays a significant role in tumor progression and promoting abnormal tumor vasculature. Here, we review how mechanical cues found in the tumor microenvironment promote aberrant tumor angiogenesis. Specifically, we discuss the influence of matrix stiffness and mechanical stresses in tumor tissue on tumor vasculature, as well as the mechanosensory pathways utilized by endothelial cells to respond to the physical cues found in the tumor microenvironment. We also discuss the impact of the resulting aberrant tumor vasculature on tumor progression and therapeutic treatment.
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Affiliation(s)
- Matthew R Zanotelli
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, USA
| | - Cynthia A Reinhart-King
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA.
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, USA.
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12
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Single-Cell Receptor Quantification of an In Vitro Coculture Angiogenesis Model Reveals VEGFR, NRP1, Tie2, and PDGFR Regulation and Endothelial Heterogeneity. Processes (Basel) 2019. [DOI: 10.3390/pr7060356] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Angiogenesis, the formation of new blood vessels from pre-existing ones, is essential for both normal development and numerous pathologies. Systems biology has offered a unique approach to study angiogenesis by profiling tyrosine kinase receptors (RTKs) that regulate angiogenic processes and computationally modeling RTK signaling pathways. Historically, this systems biology approach has been applied on ex vivo angiogenesis assays, however, these assays are difficult to quantify and limited in their potential of temporal analysis. In this study, we adopted a simple two-dimensional angiogenesis assay comprised of human umbilical vein endothelial cells (HUVECs) and human dermal fibroblasts (HDFs) and examined temporal dynamics of a panel of six RTKs and cell heterogeneity up to 17 days. We observed ~2700 VEGFR1 (vascular endothelial growth factor receptor 1) per cell on 24-h-old cocultured HDF plasma membranes, which do not express VEGFR when cultured alone. We observed 4000–8100 VEGFR2 per cell on cocultured HUVEC plasma membranes throughout endothelial tube formation. We showed steady increase of platelet-derived growth factor receptors (PDGFRs) on cocultured HDF plasma membranes, and more interestingly, 1900–2900 PDGFRβ per plasma membrane were found on HUVECs within the first six hours of coculturing. These quantitative findings will offer us insights into molecular regulation during angiogenesis and help assess in vitro tube formation models and their physiological relevance.
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13
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Isocitrate dehydrogenase1 mutation reduces the pericyte coverage of microvessels in astrocytic tumours. J Neurooncol 2019; 143:187-196. [PMID: 31004262 DOI: 10.1007/s11060-019-03156-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Accepted: 03/21/2019] [Indexed: 01/20/2023]
Abstract
INTRODUCTION Tumour-associated angiogenesis is associated with the malignancy and poor prognosis of glioma. Isocitrate dehydrogenase (IDH) mutations are present in the majority of lower-grade (WHO grade II and III) and secondary glioblastomas, but their roles in tumour angiogenesis remain unclear. METHODS Using magnetic resonance imaging (MRI), the cerebral blood flow (CBF) of IDH-mutated glioma was measured and compared with the IDH-wildtype glioma. The densities of microvessels in IDH-mutated and wildtype astrocytoma and glioblastoma were assessed by immunohistochemical (IHC) staining with CD34, and the pericytes were labelled with α-smooth muscle antigen (α-SMA), neural-glial antigen 2 (NG2) and PDGF receptor-β (PDGFR-β), respectively. Furthermore, glia-specific mutant IDH1 knock-in mice were generated to evaluate the roles of mutant IDH1 on brain vascular architectures. The transcriptions of the angiogenesis-related genes were assessed in TCGA datasets, including ANGPT1, PDGFB and VEGFA. The expressions of these genes were further determined by western blot in U87-MG cells expressing a mutant IDH1 or treated with 2-HG. RESULTS The MRI results indicated that CBF was reduced in the IDH-mutated gliomas. The IHC staining showed that the pericyte coverages of microvessels were significantly decreased, but the microvessel densities (MVDs) were only slightly decreased in IDH-mutated glioma. The mutant IDH1 knock-in also impeded the pericyte coverage of brain microvessels in mice. Moreover, the TCGA database showed the mRNA levels of angiogenesis factors, including ANGPT1, PDGFB and VEGFA, were downregulated, and their promoters were also highly hyper-methylated in IDH-mutated gliomas. In addition, both mutant IDH1 and D-2-HG could downregulate the expression of these genes in U87-MG cells. CONCLUSIONS Our results suggested that IDH mutations could reduce the pericyte coverage of microvessels in astrocytic tumours by inhibiting the expression of angiogenesis factors. As vascular pericytes play an essential role in maintaining functional blood vessels to support tumour growth, our findings imply a potential avenue of therapeutic strategy for IDH-mutated gliomas.
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14
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The Prognostic Value of the Combination of Low VEGFR-1 and High VEGFR-2 Expression in Endothelial Cells of Colorectal Cancer. Int J Mol Sci 2018; 19:ijms19113536. [PMID: 30423986 PMCID: PMC6274874 DOI: 10.3390/ijms19113536] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 10/17/2018] [Accepted: 10/31/2018] [Indexed: 01/11/2023] Open
Abstract
Research on tumor angiogenesis has mainly focused on the vascular endothelial growth factor (VEGF) family and on methods to block its actions. However, reports on VEGF receptor (VEGFR) expression in tumor-associated endothelial cells (ECs) are limited. Thus, we evaluated VEGF, VEGFR-1 and VEGFR-2 expression in ECs of colorectal cancer (CRC) using immunohistochemistry. VEGF, VEGFR-1 and -2 expression in ECs was quantitatively evaluated by digital image analysis in a retrospective series of 204 tumor tissue samples and related to clinical variables. The data show that the VEGF, VEGFR-1 and VEGFR-2 expression in ECs is heterogeneous. Multivariate analysis including a set of clinicopathological variables reveals that high EC VEGFR-1 expression is an independent prognostic factor for overall survival (OS). The combination of low VEGFR-1 and high VEGFR-2 expression in ECs outperforms models integrating VEGFR-1 and VEGFR-2 as separate markers. Indeed, this VEGFR-1_VEGFR-2 combination is an independent negative prognostic factor for OS (p = 0.012) and metastasis-free survival (p = 0.007). In conclusion, this work illustrates the importance of studying the distribution of VEGF members in ECs of CRC. Interestingly, our preliminary data suggest that high VEGFR-1 and low VEGFR-2 expression in ECs appear to be involved in the progression of CRC, suggesting that targeting EC VEGFR-1 could offer novel opportunities for CRC treatment. However, a prospective validation study is needed.
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15
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Chen S, Le T, Harley BAC, Imoukhuede PI. Characterizing Glioblastoma Heterogeneity via Single-Cell Receptor Quantification. Front Bioeng Biotechnol 2018; 6:92. [PMID: 30050899 PMCID: PMC6050407 DOI: 10.3389/fbioe.2018.00092] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 06/21/2018] [Indexed: 01/09/2023] Open
Abstract
Dysregulation of tyrosine kinase receptor (RTK) signaling pathways play important roles in glioblastoma (GBM). However, therapies targeting these signaling pathways have not been successful, partially because of drug resistance. Increasing evidence suggests that tumor heterogeneity, more specifically, GBM-associated stem and endothelial cell heterogeneity, may contribute to drug resistance. In this perspective article, we introduce a high-throughput, quantitative approach to profile plasma membrane RTKs on single cells. First, we review the roles of RTKs in cancer. Then, we discuss the sources of cell heterogeneity in GBM, providing context to the key cells directing resistance to drugs. Finally, we present our provisionally patented qFlow cytometry approach, and report results of a "proof of concept" patient-derived xenograft GBM study.
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Affiliation(s)
- Si Chen
- Department of Bioengineering, University of Illinois at Urbana–Champaign, Champaign, IL, United States
| | - Thien Le
- Department of Mathematics and Department of Computer Science, University of Illinois at Urbana–Champaign, Champaign, IL, United States
| | - Brendan A. C. Harley
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana–Champaign, Urbana, IL, United States
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana Champaign, Urbana, IL, United States
| | - P. I. Imoukhuede
- Department of Bioengineering, University of Illinois at Urbana–Champaign, Champaign, IL, United States
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana Champaign, Urbana, IL, United States
- Department of Biomedical Engineering, Washington University, St. Louis, MO, United States
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16
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Tansi FL, Rüger R, Kollmeier AM, Rabenhold M, Steiniger F, Kontermann RE, Teichgraeber UK, Fahr A, Hilger I. Endoglin based in vivo near-infrared fluorescence imaging of tumor models in mice using activatable liposomes. Biochim Biophys Acta Gen Subj 2018; 1862:1389-1400. [PMID: 29545133 DOI: 10.1016/j.bbagen.2018.03.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 02/28/2018] [Accepted: 03/09/2018] [Indexed: 11/17/2022]
Abstract
BACKGROUND Endoglin (CD105) is overexpressed on tumor cells and tumor vasculatures, making it a potential target for diagnostic imaging and therapy of different neoplasms. Therefore, studies on nanocarrier systems designed for endoglin-directed diagnostic and drug delivery purposes would expose the feasibility of targeting endoglin with therapeutics. METHODS Liposomes carrying high concentrations of a near-infrared fluorescent dye in the aqueous interior were prepared by the lipid film hydration and extrusion procedure, then conjugated to single chain antibody fragments either selective for murine endoglin (termed mEnd-IL) or directed towards human endoglin (termed hEnd-IL). A combination of Dynamic Light Scattering, electron microscopy, cell binding and uptake assays, confocal microscopy and in vivo fluorescence imaging of mice bearing xenografted human breast cancer and human fibrosarcoma models were implemented to elucidate the potentials of the liposomes. RESULTS The mEnd-IL and hEnd-IL were highly selective for the respective murine- and human endoglin expressing cells in vitro and in vivo. Hence, the hEnd-IL bound distinctly to the tumor cells and enabled suitable fluorescence imaging of the tumors, whereas the mEnd-IL bound the tumor vasculature, but also to the liver, kidney and lung vasculature of mice. CONCLUSIONS The work highlights key differences between targeting vascular (murine) and neoplastic (human) endoglin in animal studies, and suggests that the hEnd-IL can serve as a delivery system that targets human endoglin overexpressed in pathological conditions. GENERAL SIGNIFICANCE The endoglin-targeting liposomes presented herewith represent strategic tools for the future implementation of endoglin-directed neoplastic and anti-angiogenic therapies.
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Affiliation(s)
- Felista L Tansi
- Institute of Diagnostic and Interventional Radiology, Experimental Radiology, Jena University Hospital, Am klinikum 1, 07747 Jena, Germany.
| | - Ronny Rüger
- Department of Pharmaceutical Technology, Friedrich-Schiller-University Jena, Lessingstrasse 8, 07743 Jena, Germany.
| | - Ansgar M Kollmeier
- Institute of Diagnostic and Interventional Radiology, Experimental Radiology, Jena University Hospital, Am klinikum 1, 07747 Jena, Germany
| | - Markus Rabenhold
- Department of Pharmaceutical Technology, Friedrich-Schiller-University Jena, Lessingstrasse 8, 07743 Jena, Germany
| | - Frank Steiniger
- Center for Electron Microscopy, Jena University Hospital, Ziegelmuehlenweg 1, 07743 Jena, Germany
| | - Roland E Kontermann
- Institute of Cell Biology and Immunology, University Stuttgart, Allmandring 31, 70569 Stuttgart, Germany
| | - Ulf K Teichgraeber
- Institute of Diagnostic and Interventional Radiology, Experimental Radiology, Jena University Hospital, Am klinikum 1, 07747 Jena, Germany
| | - Alfred Fahr
- Department of Pharmaceutical Technology, Friedrich-Schiller-University Jena, Lessingstrasse 8, 07743 Jena, Germany
| | - Ingrid Hilger
- Institute of Diagnostic and Interventional Radiology, Experimental Radiology, Jena University Hospital, Am klinikum 1, 07747 Jena, Germany.
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17
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Hida K, Maishi N, Akiyama K, Ohmura-Kakutani H, Torii C, Ohga N, Osawa T, Kikuchi H, Morimoto H, Morimoto M, Shindoh M, Shinohara N, Hida Y. Tumor endothelial cells with high aldehyde dehydrogenase activity show drug resistance. Cancer Sci 2017; 108:2195-2203. [PMID: 28851003 PMCID: PMC5666026 DOI: 10.1111/cas.13388] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 08/11/2017] [Accepted: 08/16/2017] [Indexed: 01/11/2023] Open
Abstract
Tumor blood vessels play an important role in tumor progression and metastasis. We previously reported that tumor endothelial cells (TEC) exhibit several altered phenotypes compared with normal endothelial cells (NEC). For example, TEC have chromosomal abnormalities and are resistant to several anticancer drugs. Furthermore, TEC contain stem cell‐like populations with high aldehyde dehydrogenase (ALDH) activity (ALDHhighTEC). ALDHhighTEC have proangiogenic properties compared with ALDHlowTEC. However, the association between ALDHhighTEC and drug resistance remains unclear. In the present study, we found that ALDH mRNA expression and activity were higher in both human and mouse TEC than in NEC. Human NEC:human microvascular endothelial cells (HMVEC) were treated with tumor‐conditioned medium (tumor CM). The ALDHhigh population increased along with upregulation of stem‐related genes such as multidrug resistance 1, CD90, ALP, and Oct‐4. Tumor CM also induced sphere‐forming ability in HMVEC. Platelet‐derived growth factor (PDGF)‐A in tumor CM was shown to induce ALDH expression in HMVEC. Finally, ALDHhighTEC were resistant to fluorouracil (5‐FU) in vitro and in vivo. ALDHhighTEC showed a higher grade of aneuploidy compared with that in ALDHlowTEC. These results suggested that tumor‐secreting factor increases ALDHhighTEC populations that are resistant to 5‐FU. Therefore, ALDHhighTEC in tumor blood vessels might be an important target to overcome or prevent drug resistance.
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Affiliation(s)
- Kyoko Hida
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan.,Vascular Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
| | - Nako Maishi
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan.,Vascular Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
| | - Kosuke Akiyama
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan.,Vascular Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
| | - Hitomi Ohmura-Kakutani
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Chisaho Torii
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan.,Vascular Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
| | - Noritaka Ohga
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Takahiro Osawa
- Department of Renal and Genitourinary Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Hiroshi Kikuchi
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan.,Department of Renal and Genitourinary Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Hirofumi Morimoto
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan.,Department of Gastroenterological Surgery II, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Masahiro Morimoto
- Vascular Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
| | - Masanobu Shindoh
- Department of Oral Pathology and Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Nobuo Shinohara
- Department of Renal and Genitourinary Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Yasuhiro Hida
- Department of Cardiovascular and Thoracic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
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18
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van Hell AJ, Haimovitz-Friedman A, Fuks Z, Tap WD, Kolesnick R. Gemcitabine kills proliferating endothelial cells exclusively via acid sphingomyelinase activation. Cell Signal 2017; 34:86-91. [PMID: 28238856 DOI: 10.1016/j.cellsig.2017.02.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 02/15/2017] [Accepted: 02/22/2017] [Indexed: 12/20/2022]
Abstract
Gemcitabine is a widely-used anti-cancer drug with a well-defined mechanism of action in normal and transformed epithelial cells. However, its effect on endothelial cells is largely unknown. Acid sphingomyelinase (ASMase) is highly expressed in endothelial cells, converting plasma membrane sphingomyelin to pro-apoptotic ceramide upon activation by diverse stresses. In the current study, we investigated gemcitabine impact in primary cultures of endothelial cells. We find baseline ASMase increases markedly in bovine aortic endothelial cells (BAEC) as they transit from a proliferative to a confluent growth-arrested state. Further, gemcitabine activates ASMase and induces release of a secretory ASMase form into the media only in proliferating endothelial cells. Additionally, proliferative, but not growth-arrested BAEC, are sensitive to gemcitabine-induced apoptotic death, an effect blocked by inhibiting ASMase with imipramine or by binding ceramide on the cell surface with an anti-ceramide Ab. Confluent growth-arrested BAEC can be re-sensitized to gemcitabine-induced apoptosis by provision of exogenous sphingomyelinase. A highly similar phenotype was observed in primary cultures of human coronary artery endothelial cells. These findings reveal a previously-unrecognized mechanism of gemcitabine cytotoxicity in endothelium that may well contribute to its clinical benefit, and suggest the potential for further improvement of its clinical efficacy via pharmacologic modulation of ASMase/ceramide signaling in proliferative tumor endothelium.
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Affiliation(s)
- Albert J van Hell
- Laboratory of Signal Transduction, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA; Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
| | | | - Zvi Fuks
- Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
| | - William D Tap
- Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
| | - Richard Kolesnick
- Laboratory of Signal Transduction, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.
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19
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Corti F, Simons M. Modulation of VEGF receptor 2 signaling by protein phosphatases. Pharmacol Res 2017; 115:107-123. [PMID: 27888154 PMCID: PMC5205541 DOI: 10.1016/j.phrs.2016.11.022] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 11/18/2016] [Accepted: 11/21/2016] [Indexed: 12/21/2022]
Abstract
Phosphorylation of serines, threonines, and tyrosines is a central event in signal transduction cascades in eukaryotic cells. The phosphorylation state of any particular protein reflects a balance of activity between kinases and phosphatases. Kinase biology has been exhaustively studied and is reasonably well understood, however, much less is known about phosphatases. A large body of evidence now shows that protein phosphatases do not behave as indiscriminate signal terminators, but can function both as negative or positive regulators of specific signaling pathways. Genetic models have also shown that different protein phosphatases play precise biological roles in health and disease. Finally, genome sequencing has unveiled the existence of many protein phosphatases and associated regulatory subunits comparable in number to kinases. A wide variety of roles for protein phosphatase roles have been recently described in the context of cancer, diabetes, hereditary disorders and other diseases. In particular, there have been several recent advances in our understanding of phosphatases involved in regulation of vascular endothelial growth factor receptor 2 (VEGFR2) signaling. The receptor is the principal signaling molecule mediating a wide spectrum of VEGF signal and, thus, is of paramount significance in a wide variety of diseases ranging from cancer to cardiovascular to ophthalmic. This review focuses on the current knowledge about protein phosphatases' regulation of VEGFR2 signaling and how these enzymes can modulate its biological effects.
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Affiliation(s)
- Federico Corti
- Yale Cardiovascular Research Center, Department of Internal Medicine and Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA.
| | - Michael Simons
- Yale Cardiovascular Research Center, Department of Internal Medicine and Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA.
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20
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Xiao L, McCann JV, Dudley AC. Isolation and Culture Expansion of Tumor-specific Endothelial Cells. J Vis Exp 2015:e53072. [PMID: 26554446 DOI: 10.3791/53072] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Freshly isolated tumor-specific endothelial cells (TEC) can be used to explore molecular mechanisms of tumor angiogenesis and serve as an in vitro model for developing new angiogenesis inhibitors for cancer. However, long-term in vitro expansion of murine endothelial cells (EC) is challenging due to phenotypic drift in culture (endothelial-to-mesenchymal transition) and contamination with non-EC. This is especially true for TEC which are readily outcompeted by co-purified fibroblasts or tumor cells in culture. Here, a high fidelity isolation method that takes advantage of immunomagnetic enrichment coupled with colony selection and in vitro expansion is described. This approach generates pure EC fractions that are entirely free of contaminating stromal or tumor cells. It is also shown that lineage-traced Cdh5(cre):ZsGreen(l/s/l) reporter mice, used with the protocol described herein, are a valuable tool to verify cell purity as the isolated EC colonies from these mice show durable and brilliant ZsGreen fluorescence in culture.
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Affiliation(s)
- Lin Xiao
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill
| | - James V McCann
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill
| | - Andrew C Dudley
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill; McAllister Heart Institute, University of North Carolina at Chapel Hill;
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21
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Omori K, Murata T. [Characteristics of tumor endothelial cells]. Nihon Yakurigaku Zasshi 2015; 146:174. [PMID: 26354018 DOI: 10.1254/fpj.146.174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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DelNero P, Lane M, Verbridge SS, Kwee B, Kermani P, Hempstead B, Stroock A, Fischbach C. 3D culture broadly regulates tumor cell hypoxia response and angiogenesis via pro-inflammatory pathways. Biomaterials 2015; 55:110-8. [PMID: 25934456 DOI: 10.1016/j.biomaterials.2015.03.035] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 03/16/2015] [Accepted: 03/20/2015] [Indexed: 01/08/2023]
Abstract
Oxygen status and tissue dimensionality are critical determinants of tumor angiogenesis, a hallmark of cancer and an enduring target for therapeutic intervention. However, it is unclear how these microenvironmental conditions interact to promote neovascularization, due in part to a lack of comprehensive, unbiased data sets describing tumor cell gene expression as a function of oxygen levels within three-dimensional (3D) culture. Here, we utilized alginate-based, oxygen-controlled 3D tumor models to study the interdependence of culture context and the hypoxia response. Microarray gene expression analysis of tumor cells cultured in 2D versus 3D under ambient or hypoxic conditions revealed striking interdependence between culture dimensionality and hypoxia response, which was mediated in part by pro-inflammatory signaling pathways. In particular, interleukin-8 (IL-8) emerged as a major player in the microenvironmental regulation of the hypoxia program. Notably, this interaction between dimensionality and oxygen status via IL-8 increased angiogenic sprouting in a 3D endothelial invasion assay. Taken together, our data suggest that pro-inflammatory pathways are critical regulators of tumor hypoxia response within 3D environments that ultimately impact tumor angiogenesis, potentially providing important therapeutic targets. Furthermore, these results highlight the importance of pathologically relevant tissue culture models to study the complex physical and chemical processes by which the cancer microenvironment mediates new vessel formation.
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Affiliation(s)
- Peter DelNero
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Maureen Lane
- Department of Medicine, Weill Cornell Medical School, New York, NY 10065, USA
| | - Scott S Verbridge
- School of Biomedical Engineering and Sciences, Virginia Tech-Wake Forest University, Blacksburg, VA 24061, USA
| | - Brian Kwee
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Pouneh Kermani
- Department of Medicine, Weill Cornell Medical School, New York, NY 10065, USA
| | - Barbara Hempstead
- Department of Medicine, Weill Cornell Medical School, New York, NY 10065, USA
| | - Abraham Stroock
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY 14853, USA; Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA
| | - Claudia Fischbach
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA; Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA.
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23
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Dudley AC, Bautch VL. Feeding cancer's sweet tooth: specialized tumour vasculature shuttles glucose in pancreatic ductal adenocarcinoma. J Pathol 2015; 236:133-5. [PMID: 25727340 DOI: 10.1002/path.4526] [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: 02/11/2015] [Revised: 02/11/2015] [Accepted: 02/21/2015] [Indexed: 11/10/2022]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a highly lethal neoplasm characterized by a 'fortress' of thick collagen fibres, abundant myofibroblasts, and paradoxically reduced vascularization compared to normal pancreas. Despite these features, PDAC shows no reduction in the uptake of glucose that fuels tumour cell survival. In new work published in The Journal of Pathology, Saiyin and colleagues have identified a novel adaptation of PDAC tumour endothelium; namely, 'hairy-like' basal microvilli that increase the total vascular surface area and correlate with regions of highest glucose uptake. Since basal microvilli are not present on normal pancreatic blood vessels, their presence may add diagnostic value and blocking their function is a potential new treatment strategy for PDAC. This novel finding of basal microvilli on PDAC endothelium is a striking example of how phenotypic plasticity in tumour blood vessels contributes to tumour growth and progression, independent of conventional modes of angiogenesis.
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Affiliation(s)
- Andrew C Dudley
- Department of Cell Biology & Physiology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.,Lineberger Comprehensive Cancer Center, Chapel Hill, NC, USA.,McAllister Heart Institute, Chapel Hill, NC, USA
| | - Victoria L Bautch
- Lineberger Comprehensive Cancer Center, Chapel Hill, NC, USA.,McAllister Heart Institute, Chapel Hill, NC, USA.,Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Abstract
The vasculature, composed of vessels of different morphology and function, distributes blood to all tissues and maintains physiological tissue homeostasis. In pathologies, the vasculature is often affected by, and engaged in, the disease process. This may result in excessive formation of new, unstable, and hyperpermeable vessels with poor blood flow, which further promotes hypoxia and disease propagation. Chronic vessel permeability may also facilitate metastatic spread of cancer. Thus, there is a strong incentive to learn more about an important aspect of vessel biology in health and disease: the regulation of vessel permeability. The current review aims to summarize current insights into different mechanisms of vascular permeability, its regulatory factors, and the consequences for disease.
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Affiliation(s)
- Lena Claesson-Welsh
- Uppsala University, Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala, Sweden
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25
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Mancuso P, Calleri A, Gregato G, Labanca V, Quarna J, Antoniotti P, Cuppini L, Finocchiaro G, Eoli M, Rosti V, Bertolini F. A subpopulation of circulating endothelial cells express CD109 and is enriched in the blood of cancer patients. PLoS One 2014; 9:e114713. [PMID: 25506915 PMCID: PMC4266608 DOI: 10.1371/journal.pone.0114713] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Accepted: 11/13/2014] [Indexed: 01/25/2023] Open
Abstract
Background The endothelium is not a homogeneous organ. Endothelial cell heterogeneity has been described at the level of cell morphology, function, gene expression, and antigen composition. As a consequence of the genetic, transcriptome and surrounding environment diversity, endothelial cells from different vascular beds have differentiated functions and phenotype. Detection of circulating endothelial cells (CECs) by flow cytometry is an approach widely used in cancer patients, and their number, viability and kinetic is a promising tool to stratify patient receiving anti-angiogenic treatment. Methodology/Principal Findings Currently CECs are identified as positive for a nuclear binding antigen (DNA+), negative for the pan leukocyte marker CD45, and positive for CD31 and CD146. Following an approach recently validated in our laboratory, we investigated the expression of CD109 on CECs from the peripheral blood of healthy subject and cancer patients. The endothelial nature of these cells was validated by RT-PCR for the presence of m-RNA level of CDH5 (Ve-Cadherin) and CLDN5 (Claudin5), two endothelial specific transcripts. Before treatment, significantly higher levels of CD109+ CECs and viable CD109+CECs were found in breast cancer patients and glioblastoma patients compared to healthy controls, and their number significantly decreased after treatment. Higher levels of endothelial specific transcripts expressed in developing endothelial cells CLEC14a, TMEM204, ARHGEF15, GPR116, were observed in sorted CD109+CECs when compared to sorted CD146+CECs, suggesting that these genes can play an important role not only during embryogenesis but also in adult angiogenesis. Interestingly, mRNA levels of TEM8 (identified as Antrax Toxin Receptor1, Antrax1) were expressed in CD109+CECs+ but not in CD146+CECs. Conclusion Taken together our results suggest that CD109 represent a rare population of circulating tumor endothelial cells, that play a potentially useful prognostic role in patients with glioblastoma. The role of CD109 expression in cancer vessel-specific endothelial cells deserves to be further investigated by gene expression studies.
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Affiliation(s)
- Patrizia Mancuso
- Laboratory of Hematology-Oncology, European Institute of Oncology, Milan, Italy
- * E-mail:
| | - Angelica Calleri
- Laboratory of Hematology-Oncology, European Institute of Oncology, Milan, Italy
| | - Giuliana Gregato
- Laboratory of Hematology-Oncology, European Institute of Oncology, Milan, Italy
| | - Valentina Labanca
- Laboratory of Hematology-Oncology, European Institute of Oncology, Milan, Italy
| | - Jessica Quarna
- Laboratory of Hematology-Oncology, European Institute of Oncology, Milan, Italy
| | | | - Lucia Cuppini
- Department of Neuro-Oncology, Fondazione IRCCS Istituto Neurologico C. Besta, Milan, Italy
| | - Gaetano Finocchiaro
- Department of Neuro-Oncology, Fondazione IRCCS Istituto Neurologico C. Besta, Milan, Italy
| | - Marica Eoli
- Department of Neuro-Oncology, Fondazione IRCCS Istituto Neurologico C. Besta, Milan, Italy
| | - Vittorio Rosti
- Center for the Study and Treatment of Myelofibrosis, Research Laboratories of Biotechnology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Francesco Bertolini
- Laboratory of Hematology-Oncology, European Institute of Oncology, Milan, Italy
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Sun H, Guo D, Su Y, Yu D, Wang Q, Wang T, Zhou Q, Ran X, Zou Z. Hyperplasia of pericytes is one of the main characteristics of microvascular architecture in malignant glioma. PLoS One 2014; 9:e114246. [PMID: 25478951 PMCID: PMC4257691 DOI: 10.1371/journal.pone.0114246] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Accepted: 11/05/2014] [Indexed: 11/18/2022] Open
Abstract
Objectives To investigate the role of pericytes in constructing the malformed microvessels (MVs) and participating microvascular architecture heterogeneity of glioma. Methods Forty human glioma tissue samples (WHO grade II-IV) were included in present study. Observation of blood vessel patterns, quantitative analysis of endothelial cells (ECs)- and pericyte-labeled MVs and comparison between malignant grades based on single- or double-immunohistochemical staining. The MV number density (MVND), microvascular pericyte number density (MPND), and microvascular pericyte area density (MPAD) were calculated. The expression of PDGFβ was also scored after immunostaining. Results In grade II glioma, most of tumor MVs were the thin-wall CD34+ vessels with near normal morphology. In addition to thin-wall CD34+ MVs, more thick-wall MVs were found in grade III glioma, which often showed α-SMA positive. Most of MVs in grade IV glioma were in the form of plexus, curled cell cords and glomeruloid microvascular proliferation while the α-SMA+ cells were the main components. The MVs usually showed disordered arrangement, loose connection and active cell proliferation as shown by Ki67 and α-SMA coexpression. With the increase of glioma grades, the α-SMA+ MVND, CD34+ MVND and MPND were significantly augmented although the increase of CD34+ MVND but not MPAD was statistically insignificant between grade III and IV. It was interesting that some vessel-like structures only consist of α-SMA+ cells, assuming the guiding role of pericytes in angiogenesis. The expression level of PDGFβ was upregulated and directly correlated with the MPND in different glioma grades. Conclusion Hyperplasia of pericytes was one of the significant characteristics of malignant glioma and locally proliferated pericytes were the main constituent of MVs in high grade glioma. The pathological characteristics of pericytes could be used as indexes of malignant grades of glioma.
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Affiliation(s)
- Huiqin Sun
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, China
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, and Key Laboratory of Tumor Immunopathology, Ministry of Education of China, Chongqing, China
- * E-mail: (HS); (ZZ)
| | - Deyu Guo
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, and Key Laboratory of Tumor Immunopathology, Ministry of Education of China, Chongqing, China
| | - Yongping Su
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Dongmei Yu
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, and Key Laboratory of Tumor Immunopathology, Ministry of Education of China, Chongqing, China
| | - Qingliang Wang
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, and Key Laboratory of Tumor Immunopathology, Ministry of Education of China, Chongqing, China
| | - Tao Wang
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Qing Zhou
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Xinze Ran
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Zhongmin Zou
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, China
- * E-mail: (HS); (ZZ)
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Ohmura-Kakutani H, Akiyama K, Maishi N, Ohga N, Hida Y, Kawamoto T, Iida J, Shindoh M, Tsuchiya K, Shinohara N, Hida K. Identification of tumor endothelial cells with high aldehyde dehydrogenase activity and a highly angiogenic phenotype. PLoS One 2014; 9:e113910. [PMID: 25437864 PMCID: PMC4250080 DOI: 10.1371/journal.pone.0113910] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 10/30/2014] [Indexed: 11/19/2022] Open
Abstract
Tumor blood vessels play an important role in tumor progression and metastasis. It has been reported that tumor endothelial cells (TECs) exhibit highly angiogenic phenotypes compared with those of normal endothelial cells (NECs). TECs show higher proliferative and migratory abilities than those NECs, together with upregulation of vascular endothelial growth factor (VEGF) and VEGF receptor 2 (VEGFR2). Furthermore, compared with NECs, stem cell markers such as Sca-1, CD90, and multidrug resistance 1 are upregulated in TECs, suggesting that stem-like cells exist in tumor blood vessels. In this study, to reveal the biological role of stem-like TECs, we analyzed expression of the stem cell marker aldehyde dehydrogenase (ALDH) in TECs and characterized ALDHhigh TECs. TECs and NECs were isolated from melanoma-xenografted nude mice and normal dermis, respectively. ALDH mRNA expression and activity were higher in TECs than those in NECs. Next, ALDHhigh/low TECs were isolated by fluorescence-activated cell sorting to compare their characteristics. Compared with ALDHlow TECs, ALDHhigh TECs formed more tubes on Matrigel-coated plates and sustained the tubular networks longer. Furthermore, VEGFR2 expression was higher in ALDHhigh TECs than that in ALDHlow TECs. In addition, ALDH was expressed in the tumor blood vessels of in vivo mouse models of melanoma and oral carcinoma, but not in normal blood vessels. These findings indicate that ALDHhigh TECs exhibit an angiogenic phenotype. Stem-like TECs may have an essential role in tumor angiogenesis.
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Affiliation(s)
- Hitomi Ohmura-Kakutani
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
- Department of Orthodontics, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Kosuke Akiyama
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
- Division of Vascular Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
| | - Nako Maishi
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
- Division of Vascular Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
| | - Noritaka Ohga
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Yasuhiro Hida
- Department of Cardiovascular and Thoracic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Taisuke Kawamoto
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Junichiro Iida
- Department of Orthodontics, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Masanobu Shindoh
- Department of Oral Pathology and Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Kunihiko Tsuchiya
- Department of Renal and Genitourinary Surgery, Graduate School of Medicine, Sapporo, Japan
| | - Nobuo Shinohara
- Department of Renal and Genitourinary Surgery, Graduate School of Medicine, Sapporo, Japan
| | - Kyoko Hida
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
- Division of Vascular Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
- * E-mail:
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Abstract
Functionally, platelets are primarily recognized as key regulators of thrombosis and hemostasis. Upon vessel injury, the typically quiescent platelet interacts with subendothelial matrix to regulate platelet adhesion, activation and aggregation, with subsequent induction of the coagulation cascade forming a thrombus. Recently, however, newly described roles for platelets in the regulation of angiogenesis have emerged. Platelets possess an armory of pro- and anti-angiogenic proteins, which are actively sequestered and highly organized in α-granule populations. Platelet activation facilitates their release, eliciting potent angiogenic responses through mechanisms that appear to be tightly regulated. In conjunction, the release of platelet-derived phospholipids and microparticles has also earned merit as synergistic regulators of angiogenesis. Consequently, platelets have been functionally implicated in a range of angiogenesis-dependent processes, including physiological roles in wound healing, vascular development and blood/lymphatic vessel separation, whilst facilitating aberrant angiogenesis in a range of diseases including cancer, atherosclerosis and diabetic retinopathy. Whilst the underlying mechanisms are only starting to be elucidated, significant insights have been established, suggesting that platelets represent a promising therapeutic strategy in diseases requiring angiogenic modulation. Moreover, anti-platelet therapies targeting thrombotic complications also exert protective effects in disorders characterized by persistent angiogenesis.
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Affiliation(s)
- Tony G Walsh
- School of Physiology and Pharmacology, University of Bristol , Bristol , UK and
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29
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Xiao L, Harrell JC, Perou CM, Dudley AC. Identification of a stable molecular signature in mammary tumor endothelial cells that persists in vitro. Angiogenesis 2013; 17:511-8. [PMID: 24257808 DOI: 10.1007/s10456-013-9409-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Accepted: 11/13/2013] [Indexed: 12/25/2022]
Abstract
Long-term, in vitro propagation of tumor-specific endothelial cells (TEC) allows for functional studies and genome-wide expression profiling of clonally derived, well-characterized subpopulations. Using a genetically engineered mouse model of mammary adenocarcinoma, we have optimized an isolation procedure and defined growth conditions for long-term propagation of mammary TEC. The isolated TEC maintain their endothelial specification and phenotype in culture. Furthermore, gene expression profiling of multiple TEC subpopulations revealed striking, persistent overexpression of several candidate genes including Irx2 and Zfp503 (transcription factors), Alcam and Cd133 (cell surface markers), Ccl4 and neurotensin (Nts) (angiocrine factors), and Gpr182 and Cnr2 (G protein-coupled receptors). Taken together, we have developed an effective method for isolating and culture-expanding mammary TEC, and uncovered several new TEC-selective genes whose overexpression persists even after long-term in vitro culture. These results suggest that the tumor microenvironment may induce changes in vascular endothelium in vivo that are stably transmittable in vitro.
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Affiliation(s)
- Lin Xiao
- Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, 3340C Medical Biomolecular Research Building, Chapel Hill, NC, 27599, USA
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Abstract
The vascular endothelium is a dynamic cellular "organ" that controls passage of nutrients into tissues, maintains the flow of blood, and regulates the trafficking of leukocytes. In tumors, factors such as hypoxia and chronic growth factor stimulation result in endothelial dysfunction. For example, tumor blood vessels have irregular diameters; they are fragile, leaky, and blood flow is abnormal. There is now good evidence that these abnormalities in the tumor endothelium contribute to tumor growth and metastasis. Thus, determining the biological basis underlying these abnormalities is critical for understanding the pathophysiology of tumor progression and facilitating the design and delivery of effective antiangiogenic therapies.
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Affiliation(s)
- Andrew C Dudley
- Department of Cellular and Molecular Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA; Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina 27599, USA; and McAllister Heart Institute, Chapel Hill, North Carolina 27599, USA.
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31
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Al-Greene NT, Means AL, Lu P, Jiang A, Schmidt CR, Chakravarthy AB, Merchant NB, Washington MK, Zhang B, Shyr Y, Deane NG, Beauchamp RD. Four jointed box 1 promotes angiogenesis and is associated with poor patient survival in colorectal carcinoma. PLoS One 2013; 8:e69660. [PMID: 23922772 PMCID: PMC3726759 DOI: 10.1371/journal.pone.0069660] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 06/11/2013] [Indexed: 01/08/2023] Open
Abstract
Angiogenesis, the recruitment and re-configuration of pre-existing vasculature, is essential for tumor growth and metastasis. Increased tumor vascularization often correlates with poor patient outcomes in a broad spectrum of carcinomas. We identified four jointed box 1 (FJX1) as a candidate regulator of tumor angiogenesis in colorectal cancer. FJX1 mRNA and protein are upregulated in human colorectal tumor epithelium as compared with normal epithelium and colorectal adenomas, and high expression of FJX1 is associated with poor patient prognosis. FJX1 mRNA expression in colorectal cancer tissues is significantly correlated with changes in known angiogenesis genes. Augmented expression of FJX1 in colon cancer cells promotes growth of xenografts in athymic mice and is associated with increased tumor cell proliferation and vascularization. Furthermore, FJX1 null mice develop significantly fewer colonic polyps than wild-type littermates after combined dextran sodium sulfate (DSS) and azoxymethane (AOM) treatment. In vitro, conditioned media from FJX1 expressing cells promoted endothelial cell capillary tube formation in a HIF1-α dependent manner. Taken together our results support the conclusion that FJX1 is a novel regulator of tumor progression, due in part, to its effect on tumor vascularization.
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Affiliation(s)
- Nicole T. Al-Greene
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Anna L. Means
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee, United States of America
- Department of Surgery, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Pengcheng Lu
- Department of Biostatistics, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Aixiang Jiang
- Department of Biostatistics, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Carl R. Schmidt
- Department of Surgery, Vanderbilt University, Nashville, Tennessee, United States of America
| | - A. Bapsi Chakravarthy
- Department of Radiation Oncology, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Nipun B. Merchant
- Department of Surgery, Vanderbilt University, Nashville, Tennessee, United States of America
- Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, Tennessee, United States of America
| | - M. Kay Washington
- Department of Pathology, Vanderbilt University, Nashville, Tennessee, United States of America
- Department of Microbiology and Immunology, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Bing Zhang
- Department of Biomedical Informatics, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Yu Shyr
- Department of Biostatistics, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Natasha G. Deane
- Department of Surgery, Vanderbilt University, Nashville, Tennessee, United States of America
- Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, Tennessee, United States of America
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, Tennessee, United States of America
| | - R. Daniel Beauchamp
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee, United States of America
- Department of Surgery, Vanderbilt University, Nashville, Tennessee, United States of America
- Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, Tennessee, United States of America
- Department of Cancer Biology, Vanderbilt University, Nashville, Tennessee, United States of America
- * E-mail:
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32
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Abstract
The endothelial lining of blood vessels shows remarkable heterogeneity in structure and function, in time and space, and in health and disease. An understanding of the molecular basis for phenotypic heterogeneity may provide important insights into vascular bed-specific therapies. First, we review the scope of endothelial heterogeneity and discuss its proximate and evolutionary mechanisms. Second, we apply these principles, together with their therapeutic implications, to a representative vascular bed in disease, namely, tumor endothelium.
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Affiliation(s)
- William C Aird
- Department of Medicine, Center for Vascular Biology Research, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA.
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Carraway RE, Cochrane DE. Enhanced vascular permeability is hypothesized to promote inflammation-induced carcinogenesis and tumor development via extravasation of large molecular proteins into the tissue. Med Hypotheses 2012; 78:738-43. [PMID: 22459481 DOI: 10.1016/j.mehy.2012.02.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 02/18/2012] [Indexed: 12/11/2022]
Abstract
We propose that the growth of solid tumors is dependent, in part, on the entry of large molecular blood-borne growth regulators into the tissue and is facilitated by the highly permeable nature of tumor blood vessels. There is abundant evidence that the tumor vasculature is hyperpermeable and tumor growth is dependent on mediators that increase vascular permeability (e.g., VEGF and mast cells). Therefore, the extravasation of plasma proteins into the interstitial space could be an important determinant of tumor growth. Angiogenesis promotes cancer by creating a network of blood vessels that supplies oxygen and nutriment. A highly permeable vasculature could complement this by facilitating the entry of plasma proteins into the tumor space, permitting them to exert effects on growth and survival pathways. Plasma proteins could act directly (on the cancer cells) or indirectly (via the stroma), and could conceivably stimulate cell proliferation, enhance cell survival, promote angiogenesis, and/or provide the cells with essential nutrients. Since increased vascular permeability is a hallmark of inflammation and since chronic inflammation is a forerunner to cancer, we also suggest that the prolonged influx of plasma proteins during chronic inflammation could contribute to the carcinogenic process. Perhaps over time and in sufficient quantity, the extruded plasma proteins and the attendant edema set up a feed-forward cycle that exacerbates the inflammation and potentiates the formation of mutagens and growth regulators. It is tempting to speculate that differences in tumor growth/metastasis and patient outcome are at least partly due to the degree of permeability of the tumor vasculature.
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Affiliation(s)
- Robert E Carraway
- Department of Emergency Medicine, University of Massachusetts Medical School, Worcester, MA, United States.
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Heterogeneity of tumor endothelial cells: comparison between tumor endothelial cells isolated from high- and low-metastatic tumors. THE AMERICAN JOURNAL OF PATHOLOGY 2012; 180:1294-1307. [PMID: 22245217 DOI: 10.1016/j.ajpath.2011.11.035] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 10/14/2011] [Accepted: 11/21/2011] [Indexed: 12/13/2022]
Abstract
An important concept in tumor angiogenesis is that tumor endothelial cells (TECs) are genetically normal and homogeneous. However, we previously reported that TECs differ from normal ECs. Whether the characteristics of TECs derived from different tumors differ remains unknown. To elucidate this, in this study, we isolated two types of TECs from high-metastatic (HM) and low-metastatic (LM) tumors and compared their characteristics. HM tumor-derived TECs (HM-TECs) showed higher proliferative activity and invasive activity than LM tumor-derived TECs (LM-TECs). Moreover, the mRNA expression levels of pro-angiogenic genes, such as vascular endothelial growth factor (VEGF) receptors 1 and 2, VEGF, and hypoxia-inducible factor-1α, were higher in HM-TECs than in LM-TECs. The tumor blood vessels themselves and the surrounding area in HM tumors were exposed to hypoxia. Furthermore, HM-TECs showed higher mRNA expression levels of the stemness-related gene stem cell antigen and the mesenchymal marker CD90 compared with LM-TECs. HM-TECs were spheroid, with a smoother surface and higher circularity in the stem cell spheroid assay. HM-TECs differentiated into osteogenic cells, expressing activated alkaline phosphatase in an osteogenic medium at a higher rate than either LM-TECs or normal ECs. Furthermore, HM-TECs contained more aneuploid cells than LM-TECs. These results indicate that TECs from HM tumors have a more pro-angiogenic phenotype than those from LM tumors.
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Franses JW, Edelman ER. The evolution of endothelial regulatory paradigms in cancer biology and vascular repair. Cancer Res 2011; 71:7339-44. [PMID: 22144472 DOI: 10.1158/0008-5472.can-11-1718] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Although the roles of endothelial cells in cancer have primarily been considered to be related to tumor perfusion, the emerging appreciation of "angiocrine" regulation adds stromal regulatory capabilities to the expanding list of endothelial functions in tumors. We posit that an understanding of the state-dependent paracrine regulatory paradigms established in vascular disease and repair will be critical for a deep understanding of tumor biology, as endothelial cells regulate diverse processes in all vascularized tissues. Here, we outline the historical developments that led to the appreciation of the paracrine regulatory functions of endothelial cells, summarize classical views of blood vessels and stroma in cancer, and attempt to merge these ideas to include the stromal regulatory endothelial cell as a critical regulator of cancer. The notion of the endothelial cell as a biochemical regulator of cancer state in constant dynamic balance with its tumor could impact diagnosis, prognosis, and treatment of cancer. Such concepts might well explain the mixed results from antiangiogenic cancer therapeutics and how certain drugs that improve vascular health correlate with improved cancer prognosis.
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Affiliation(s)
- Joseph W Franses
- Biomedical Engineering Center, Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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Langenkamp E, Vom Hagen FM, Zwiers PJ, Moorlag HE, Schouten JP, Hammes HP, Gouw ASH, Molema G. Tumor Vascular Morphology Undergoes Dramatic Changes during Outgrowth of B16 Melanoma While Proangiogenic Gene Expression Remains Unchanged. ISRN ONCOLOGY 2011; 2011:409308. [PMID: 22235379 PMCID: PMC3249352 DOI: 10.5402/2011/409308] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Accepted: 09/07/2011] [Indexed: 12/28/2022]
Abstract
In established tumors, angiogenic endothelial cells (ECs) coexist next to “quiescent” EC in matured vessels. We hypothesized that angio-gene expression of B16.F10 melanoma would differ depending on the growth stage. Unraveling the spatiotemporal nature thereof is essential for drug regimen design aimed to affect multiple neovascularization stages. We determined the angiogenic phenotype—represented by 52 angio-genes—and vascular morphology of small, intermediate, and large s.c. growing mouse B16.F10 tumors and demonstrated that expression of these genes did not differ between the different growth stages. Yet vascular morphology changed dramatically from small vessels without lumen in small to larger vessels with increased lumen size in intermediate/large tumors. Separate analysis of these vascular morphologies revealed a significant difference in αSMA expression in relation to vessel morphology, while no relation with VEGF, HIF-1α, nor Dll4 expression levels was observed. We conclude that the tumor vasculature remains actively engaged in angiogenesis during B16.F10 melanoma outgrowth and that the major change in tumor vascular morphology does not follow molecular concepts generated in other angiogenesis models.
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Affiliation(s)
- Elise Langenkamp
- Medical Biology Section, Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
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Abstract
The haemostatic role of platelets was established in the 1880s by Bizzozero who observed their ability to adhere and aggregate at sites of vascular injury. It was only some 80 years later that the function of platelets in maintaining the structural integrity of intact blood vessels was reported by Danielli. Danielli noted that platelets help preserve the barrier function of endothelium during organ perfusion. Subsequent studies have demonstrated further that platelets are continuously needed to support intact mature blood vessels. More recently, platelets were shown to safeguard developing vessels, lymphatics, as well as the microvasculature at sites of leukocyte infiltration, including inflamed organs and tumours. Interestingly, from a mechanistic point of view, the supporting role of platelets in these various vessels does not necessarily involve the well-understood process of platelet plug formation but, rather, may rely on secretion of the various platelet granules and their many active components. The present review focuses on these nonconventional aspects of platelet biology and function by presenting situations in which platelets intervene to maintain vascular integrity and discusses possible mechanisms of their actions. We propose that modulating these newly described platelet functions may help treat haemorrhage as well as treat cancer by increasing the efficacy of drug delivery to tumours.
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Franses JW, Baker AB, Chitalia VC, Edelman ER. Stromal endothelial cells directly influence cancer progression. Sci Transl Med 2011; 3:66ra5. [PMID: 21248315 DOI: 10.1126/scitranslmed.3001542] [Citation(s) in RCA: 121] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Cancer growth and metastasis are regulated in part by stromal cells such as fibroblasts and immune cells within the tumor microenvironment. Endothelial cells (ECs) are also ubiquitous within tumors because tumors are vascular, and yet, the impact of tumor-resident ECs is less well understood. Through paracrine regulation, ECs modulate a diverse spectrum of pathophysiologic processes in normal and hyperplastic tissues. We hypothesized that ECs offer similar paracrine regulatory control of cancer biology. Indeed, secretions from quiescent ECs muted the proliferative and invasive phenotype of lung and breast cancer cells in vitro and reduced cancer cell protumorigenic and proinflammatory signaling. EC perlecan silencing significantly changed this regulatory relationship, eliminating the ability of ECs to inhibit cancer cell invasiveness via increased interleukin-6 secretion. Moreover, implanting ECs embedded within porous matrices slowed adjacent xenograft tumor growth and prevented architectural degeneration, with a concomitant reduction in proliferative and tumorigenic markers. Finally, lung carcinoma cells pretreated with intact EC-conditioned media, but not media conditioned with perlecan-silenced ECs, exhibited reduced micrometastatic burden after tail vein injection. These findings add to an emerging appreciation of EC-regulatory effects that transcend their structural roles and pave the way for improved characterization and control of EC-cancer cross-talk interactions for diagnosis, prognosis, and treatment of cancer.
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Affiliation(s)
- Joseph W Franses
- Biomedical Engineering Center, Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, E25-438, Cambridge, MA 02139, USA
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Nonogaki S, Campos HGA, Butugan O, Soares FA, Mangone FRR, Torloni H, Brentani MM. Markers of vascular differentiation, proliferation and tissue remodeling in juvenile nasopharyngeal angiofibromas. Exp Ther Med 2010; 1:921-926. [PMID: 22993619 DOI: 10.3892/etm.2010.141] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Accepted: 07/21/2010] [Indexed: 12/24/2022] Open
Abstract
Juvenile nasopharingeal angiofibroma (JNA) is a histologically benign locally aggressive tumor characterized by irregular vessels embedded in a fibrous stroma. Excessive vascularity results in bleeding complications, and the inhibition of angiogenesis is a promising strategy for managing extensive JNA tumors. To better characterize the endothelial components of JNA, we aimed to evaluate markers of vascular differentiation and proliferation, such as friend leukemia integration-1 (FLI-1) and endoglin, lymphatic markers, including podoplanin and vascular endothelial growth factor receptor 3 (VEGFR3) and its cognate ligand VEGFC, GLUT-1, a diagnostic marker that discriminates between hemangiomas and vascular malformations, and two markers of tissue remodeling, stromelysin 3 (ST3) and secreted acid protein rich in cysteine (SPARC). Antigens were assessed immunohistochemically in vessels and stromal cells of JNA archival cases (n=22). JNA endothelial cells were positive for endoglin, VEGFC and FLI-1, whereas podoplanin and VEGFR3 were negative in all cases. Both endothelial cells and fibroblasts stained for ST3 and SPARC. GLUT-1 was investigated in JNA cases, in infantile hemangiomas (n=123) and in vascular malformations (n=135) as controls. JNAs and vascular malformations were GLUT-1-negative, while hemangiomas showed positive staining. The presence of markers of endothelial differentiation and proliferation highlighted the hyper-proliferative state of JNA vessels. The absence of podoplanin and VEGFR3 underscores their blood endothelial cell characteristic. The absence of GLUT-1 discriminates JNAs from hemangiomas. ST3 and SPARC up-regulation in endothelial cells and fibroblasts may contribute to a compensatory signaling for controlling angiogenesis. Some of these markers may eventually serve as therapeutic targets. Our results may aid in the understanding of JNA pathophysiology.
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Affiliation(s)
- Suely Nonogaki
- Instituto Adolfo Lutz, Central, Divisão de Patologia, Laboratório de Imuno-histoquímica, CEP 01246-902
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Bhasin M, Yuan L, Keskin DB, Otu HH, Libermann TA, Oettgen P. Bioinformatic identification and characterization of human endothelial cell-restricted genes. BMC Genomics 2010; 11:342. [PMID: 20509943 PMCID: PMC2887814 DOI: 10.1186/1471-2164-11-342] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Accepted: 05/28/2010] [Indexed: 01/01/2023] Open
Abstract
Background In this study, we used a systematic bioinformatics analysis approach to elucidate genes that exhibit an endothelial cell (EC) restricted expression pattern, and began to define their regulation, tissue distribution, and potential biological role. Results Using a high throughput microarray platform, a primary set of 1,191 transcripts that are enriched in different primary ECs compared to non-ECs was identified (LCB >3, FDR <2%). Further refinement of this initial subset of transcripts, using published data, yielded 152 transcripts (representing 109 genes) with different degrees of EC-specificity. Several interesting patterns emerged among these genes: some were expressed in all ECs and several were restricted to microvascular ECs. Pathway analysis and gene ontology demonstrated that several of the identified genes are known to be involved in vasculature development, angiogenesis, and endothelial function (P < 0.01). These genes are enriched in cardiovascular diseases, hemorrhage and ischemia gene sets (P < 0.001). Most of the identified genes are ubiquitously expressed in many different tissues. Analysis of the proximal promoter revealed the enrichment of conserved binding sites for 26 different transcription factors and analysis of the untranslated regions suggests that a subset of the EC-restricted genes are targets of 15 microRNAs. While many of the identified genes are known for their regulatory role in ECs, we have also identified several novel EC-restricted genes, the function of which have yet to be fully defined. Conclusion The study provides an initial catalogue of EC-restricted genes most of which are ubiquitously expressed in different endothelial cells.
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Affiliation(s)
- Manoj Bhasin
- Division of Interdisciplinary Medicine and Biotechnology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
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Butler JM, Kobayashi H, Rafii S. Instructive role of the vascular niche in promoting tumour growth and tissue repair by angiocrine factors. Nat Rev Cancer 2010; 10:138-46. [PMID: 20094048 PMCID: PMC2944775 DOI: 10.1038/nrc2791] [Citation(s) in RCA: 429] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The precise mechanisms whereby anti-angiogenesis therapy blocks tumour growth or causes vascular toxicity are unknown. We propose that endothelial cells establish a vascular niche that promotes tumour growth and tissue repair not only by delivering nutrients and O2 but also through an 'angiocrine' mechanism by producing stem and progenitor cell-active trophogens. Identification of endothelial-derived instructive angiocrine factors will allow direct tumour targeting, while diminishing the unwanted side effects associated with the use of anti-angiogenic agents.
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Affiliation(s)
- Jason M Butler
- Hideki Kobayashi and Shahin Rafii are at the Howard Hughes Medical Institute, Ansary Stem Cell Institute, Department of Genetic Medicine, Weill Cornell Medical College, New York, NY 10065, USA
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Abstract
The field of antiangiogenesis research has been met with some surprises, including the realization that tumor blood vessels are more complex and labile than expected. In this issue of Clinical Cancer Research, Xiong and colleagues show that tumor-specific endothelial cells are less sensitive to cytotoxic and antiangiogenic drugs compared to their normal counterparts.
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Affiliation(s)
- Andrew C Dudley
- Vascular Biology Program, Departments of Surgery and Pathology, Harvard Medical School, Boston, MA 02115, USA.
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