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Wang PH, Chen CP, Kuo TC. Outstanding female cancer research paper awards of the 2016 Taiwan Association of Obstetrics and Gynecology and Hsu Chien-Tien Cancer Foundation. Taiwan J Obstet Gynecol 2017; 56:581-582. [DOI: 10.1016/j.tjog.2017.08.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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52
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Crow J, Atay S, Banskota S, Artale B, Schmitt S, Godwin AK. Exosomes as mediators of platinum resistance in ovarian cancer. Oncotarget 2017; 8:11917-11936. [PMID: 28060758 PMCID: PMC5355315 DOI: 10.18632/oncotarget.14440] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 12/16/2016] [Indexed: 12/21/2022] Open
Abstract
Exosomes have been implicated in the cell-cell transfer of oncogenic proteins and genetic material. We speculated this may be one mechanism by which an intrinsically platinum-resistant population of epithelial ovarian cancer (EOC) cells imparts its influence on surrounding tumor cells. To explore this possibility we utilized a platinum-sensitive cell line, A2780 and exosomes derived from its resistant subclones, and an unselected, platinum-resistant EOC line, OVCAR10. A2780 cells demonstrate a ~2-fold increase in viability upon treatment with carboplatin when pre-exposed to exosomes from platinum-resistant cells as compared to controls. This coincided with increased epithelial to mesenchymal transition (EMT). DNA sequencing of EOC cell lines revealed previously unreported somatic mutations in the Mothers Against Decapentaplegic Homolog 4 (SMAD4) within platinum-resistant cells. A2780 cells engineered to exogenously express these SMAD4 mutations demonstrate up-regulation of EMT markers following carboplatin treatment, are more resistant to carboplatin, and release exosomes which impart a ~1.7-fold increase in resistance in naive A2780 recipient cells as compared to controls. These studies provide the first evidence that acquired SMAD4 mutations enhance the chemo-resistance profile of EOC and present a novel mechanism in which exchange of tumor-derived exosomes perpetuates an EMT phenotype, leading to the development of subpopulations of platinum-refractory cells.
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Affiliation(s)
- Jennifer Crow
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS, USA
| | - Safinur Atay
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS, USA
| | - Samagya Banskota
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS, USA.,Department of Biomedical Engineering, Duke University, Durham, North Carolina, NC, USA
| | - Brittany Artale
- Bioengineering Graduate Program, University of Kansas, Lawrence, KS, USA
| | - Sarah Schmitt
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS, USA
| | - Andrew K Godwin
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS, USA.,University of Kansas Cancer Center, Kansas City, KS, USA
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53
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Che J, Shen WZ, Deng Y, Dai YH, Liao YD, Yuan XL, Zhang P. RETRACTED: Effects of lentivirus-mediated silencing of Periostin on tumor microenvironment and bone metastasis via the integrin-signaling pathway in lung cancer. Life Sci 2017; 182:10-21. [PMID: 28601389 DOI: 10.1016/j.lfs.2017.05.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 05/19/2017] [Accepted: 05/29/2017] [Indexed: 12/12/2022]
Abstract
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief. Concern was raised about the reliability of the Western blot results in Figures 1B, 3B, 5B, and 8A which appear to have a similar phenotype as seen in many other publications, as detailed here: https://pubpeer.com/publications/E266A07D28435DB334E8777CAC97E3; and here: https://docs.google.com/spreadsheets/d/1r0MyIYpagBc58BRF9c3luWNlCX8VUvUuPyYYXzxWvgY/edit#gid=262337249. In addition, a portion of Figure 6B, ‘NC’ group appears to contain image similarities with Figure 6B, ‘si-Integrin-αvβ3’ group, and a portion of Figure 6B, ‘Blank’ group appears to contain image similarities with Figure 6B, ‘NC’ group. The journal requested that the corresponding author comment on these concerns and provide the raw data. However, the authors were not able to satisfactorily fulfill this request and therefore the Editor-in-Chief decided to retract the article.
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Affiliation(s)
- Jing Che
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China; College of Life Sciences, Wuhan University, Wuhan 430072, PR China
| | - Wen-Zhuang Shen
- Department of General Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Yu Deng
- Department of Thoracic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Yu-Hong Dai
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Yong-De Liao
- Department of Thoracic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Xiang-Lin Yuan
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Peng Zhang
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China.
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54
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The Role of Tumor Microenvironment in Chemoresistance: To Survive, Keep Your Enemies Closer. Int J Mol Sci 2017; 18:ijms18071586. [PMID: 28754000 PMCID: PMC5536073 DOI: 10.3390/ijms18071586] [Citation(s) in RCA: 277] [Impact Index Per Article: 39.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 07/16/2017] [Accepted: 07/19/2017] [Indexed: 12/12/2022] Open
Abstract
Chemoresistance is a leading cause of morbidity and mortality in cancer and it continues to be a challenge in cancer treatment. Chemoresistance is influenced by genetic and epigenetic alterations which affect drug uptake, metabolism and export of drugs at the cellular levels. While most research has focused on tumor cell autonomous mechanisms of chemoresistance, the tumor microenvironment has emerged as a key player in the development of chemoresistance and in malignant progression, thereby influencing the development of novel therapies in clinical oncology. It is not surprising that the study of the tumor microenvironment is now considered to be as important as the study of tumor cells. Recent advances in technological and analytical methods, especially ‘omics’ technologies, has made it possible to identify specific targets in tumor cells and within the tumor microenvironment to eradicate cancer. Tumors need constant support from previously ‘unsupportive’ microenvironments. Novel therapeutic strategies that inhibit such microenvironmental support to tumor cells would reduce chemoresistance and tumor relapse. Such strategies can target stromal cells, proteins released by stromal cells and non-cellular components such as the extracellular matrix (ECM) within the tumor microenvironment. Novel in vitro tumor biology models that recapitulate the in vivo tumor microenvironment such as multicellular tumor spheroids, biomimetic scaffolds and tumor organoids are being developed and are increasing our understanding of cancer cell-microenvironment interactions. This review offers an analysis of recent developments on the role of the tumor microenvironment in the development of chemoresistance and the strategies to overcome microenvironment-mediated chemoresistance. We propose a systematic analysis of the relationship between tumor cells and their respective tumor microenvironments and our data show that, to survive, cancer cells interact closely with tumor microenvironment components such as mesenchymal stem cells and the extracellular matrix.
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55
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Zhang Y, Yuan D, Yao Y, Sun W, Shi Y, Su X. Predictive and prognostic value of serum periostin in advanced non-small cell lung cancer patients receiving chemotherapy. Tumour Biol 2017; 39:1010428317698367. [PMID: 28459197 DOI: 10.1177/1010428317698367] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Periostin is an extracellular matrix protein involved in tumorigenesis and metastasis. However, the role of serum periostin as a surrogate marker for treatment efficacy is still unknown. In 122 advanced non-small cell lung cancer cases, 37 patients with benign lung disease and 40 healthy controls, serum periostin was measured by enzyme-linked immunosorbent assays. The associations of serum periostin levels with the clinic-pathological parameters, chemotherapy response, and clinical outcomes of non-small cell lung cancer patients were analyzed. Serum periostin levels were significantly higher in non-small cell lung cancer patients, and it was related significantly to bone metastasis ( p = 0.021). Serum periostin of 65 non-small cell lung cancer patients were detected before and after two cycles of chemotherapy. The patients with and without periostin response had significant difference in objective response to chemotherapy ( p = 0.001). For the 122 non-small cell lung cancer patients, the median progression-free survival was 5 months. In a multivariate analysis, performance status (hazard ratio, 1.71; 95% confidence interval, 1.10-2.67), baseline periostin (hazard ratio, 1.01; 95% confidence interval, 1.00-1.01), and periostin response (hazard ratio, 0.50; 95% confidence interval, 0.29-0.86) were significantly correlated with prognosis. In conclusion, serum periostin was elevated in advanced non-small cell lung cancer patients. Baseline periostin and periostin responses appeared to be reliable surrogate markers to predict chemotherapy response and survival in patients with advanced non-small cell lung cancer.
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Affiliation(s)
- Yan Zhang
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Dongmei Yuan
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Yanwen Yao
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Wenkui Sun
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Yi Shi
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Xin Su
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
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56
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Oh HJ, Bae JM, Wen XY, Cho NY, Kim JH, Kang GH. Overexpression of POSTN in Tumor Stroma Is a Poor Prognostic Indicator of Colorectal Cancer. J Pathol Transl Med 2017; 51:306-313. [PMID: 28407462 PMCID: PMC5445202 DOI: 10.4132/jptm.2017.01.19] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 11/30/2016] [Accepted: 01/19/2017] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Tumor microenvironment has recently drawn attention in that it is related with tumor prognosis. Cancer-associated fibroblast also plays a critical role in cancer invasiveness and progression in colorectal cancers. Periostin (POSTN), originally identified to be expressed in osteoblasts and osteoblast-derived cells, is expressed in cancer-associated fibroblasts in several tissue types of cancer. Recent studies suggest an association between stromal overexpression of POSTN and poor prognosis of cancer patients. METHODS We analyzed colorectal cancer cases for their expression status of POSTN in tumor stroma using immunohistochemistry and correlated the expression status with clinicopathological and molecular features. RESULTS High level of POSTN expression in tumor stroma was closely associated with tumor location in proximal colon, infiltrative growth pattern, undifferentiated histology, tumor budding, luminal necrosis, and higher TNM stage. High expression status of POSTN in tumor stroma was found to be an independent prognostic parameter implicating poor 5-year cancer-specific survival and 5-year progression-free survival. CONCLUSIONS Our findings suggest that POSTN overexpression in tumor stroma of colorectal cancers could be a possible candidate marker for predicting poor prognosis in patients with colorectal cancers.
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Affiliation(s)
- Hyeon Jeong Oh
- Department of Pathology, Seoul National University College of Medicine, Seoul, Korea.,Laboratory of Epigenetics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Jeong Mo Bae
- Laboratory of Epigenetics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.,Department of Pathology, SMG-SNU Boramae Medical Center, Seoul, Korea
| | - Xian-Yu Wen
- Laboratory of Epigenetics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Nam-Yun Cho
- Laboratory of Epigenetics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Jung Ho Kim
- Department of Pathology, Seoul National University College of Medicine, Seoul, Korea.,Laboratory of Epigenetics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Gyeong Hoon Kang
- Department of Pathology, Seoul National University College of Medicine, Seoul, Korea.,Laboratory of Epigenetics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
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57
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Ricciardelli C, Lokman NA, Ween MP, Oehler MK. WOMEN IN CANCER THEMATIC REVIEW: Ovarian cancer-peritoneal cell interactions promote extracellular matrix processing. Endocr Relat Cancer 2016; 23:T155-T168. [PMID: 27578826 DOI: 10.1530/erc-16-0320] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 08/30/2016] [Indexed: 12/13/2022]
Abstract
Ovarian cancer has a distinct tendency for metastasising via shedding of cancerous cells into the peritoneal cavity and implanting onto the peritoneum that lines the pelvic organs. Once ovarian cancer cells adhere to the peritoneal cells, they migrate through the peritoneal layer and invade the local organs. Alterations in the extracellular environment are critical for tumour initiation, progression and intra-peritoneal dissemination. To increase our understanding of the molecular mechanisms involved in ovarian cancer metastasis and to identify novel therapeutic targets, we recently studied the interaction of ovarian cancer and peritoneal cells using a proteomic approach. We identified several extracellular matrix (ECM) proteins including, fibronectin, TGFBI, periostin, annexin A2 and PAI-1 that were processed as a result of the ovarian cancer-peritoneal cell interaction. This review focuses on the functional role of these proteins in ovarian cancer metastasis. Our findings together with published literature support the notion that ECM processing via the plasminogen-plasmin pathway promotes the colonisation and attachment of ovarian cancer cells to the peritoneum and actively contributes to the early steps of ovarian cancer metastasis.
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Affiliation(s)
- C Ricciardelli
- Discipline of Obstetrics and GynaecologyAdelaide Medical School, Robinson Research Institute, University of Adelaide, Adelaide, South Australia, Australia
| | - N A Lokman
- Discipline of Obstetrics and GynaecologyAdelaide Medical School, Robinson Research Institute, University of Adelaide, Adelaide, South Australia, Australia
| | - M P Ween
- Lung Research LaboratoryHanson Institute, Department of Thoracic Medicine, Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - M K Oehler
- Discipline of Obstetrics and GynaecologyAdelaide Medical School, Robinson Research Institute, University of Adelaide, Adelaide, South Australia, Australia
- Department of Gynaecological OncologyRoyal Adelaide Hospital, Adelaide, South Australia, Australia
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58
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Periostin promotes the chemotherapy resistance to gemcitabine in pancreatic cancer. Tumour Biol 2016; 37:15283-15291. [PMID: 27696296 DOI: 10.1007/s13277-016-5321-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 09/05/2016] [Indexed: 01/17/2023] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) ranks fourth among cancer-related deaths. The nucleoside analog gemcitabine has been the cornerstone of adjuvant chemotherapy in PDAC for decades. However, gemcitabine resistance develops within weeks of chemotherapy initiation, which might be intrinsic to cancer cells and influenced by tumor microenvironment. Recently, pancreatic stellate cells (PSCs) have greatly increased our attention on tumor microenvironment-mediated drug resistance. Periostin is exclusively overexpressed in PSCs and the stroma of PDAC creating a tumor-supportive microenvironment in the pancreas. However, whether periostin contributed to chemoresistance in PDAC remains unknown. Therefore, we focused on the role of periostin in PDAC by observing the effects of silencing this gene on gemcitabine resistance in vitro and in vivo aiming to explore the possible molecular mechanism. In this study, the pancreatic cancer cell (PCC) proliferation and apoptosis were assayed to investigate the sensitivity to gemcitabine after silencing periostin. We provide the evidence that periostin not only drives the carcinogenic process itself but also significantly associated with gemcitabine-induced apoptosis. These findings collectively indicated that periostin increases the chemoresistance to gemcitabine. Thus, targeting periostin might offer a new opportunity to overcome the gemcitabine resistance of PDAC.
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59
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Riedl A, Schlederer M, Pudelko K, Stadler M, Walter S, Unterleuthner D, Unger C, Kramer N, Hengstschläger M, Kenner L, Pfeiffer D, Krupitza G, Dolznig H. Comparison of cancer cells in 2D vs 3D culture reveals differences in AKT-mTOR-S6K signaling and drug responses. J Cell Sci 2016; 130:203-218. [PMID: 27663511 DOI: 10.1242/jcs.188102] [Citation(s) in RCA: 228] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 09/19/2016] [Indexed: 12/17/2022] Open
Abstract
Three-dimensional (3D) cancer models are used as preclinical systems to mimic physiologic drug responses. We provide evidence for strong changes of proliferation and metabolic capacity in three dimensions by systematically analyzing spheroids of colon cancer cell lines. Spheroids showed relative lower activities in the AKT, mammalian target of rapamycin (mTOR) and S6K (also known as RPS6KB1) signaling pathway compared to cells cultured in two dimensions. We identified spatial alterations in signaling, as the level of phosphorylated RPS6 decreased from the spheroid surface towards the center, which closely coordinated with the tumor areas around vessels in vivo These 3D models displayed augmented anti-tumor responses to AKT-mTOR-S6K or mitogen-activated protein kinase (MAPK) pathway inhibition compared to those in 2D models. Inhibition of AKT-mTOR-S6K resulted in elevated ERK phosphorylation in 2D culture, whereas under these conditions, ERK signaling was reduced in spheroids. Inhibition of MEK1 (also known as MAP2K1) led to decreased AKT-mTOR-S6K signaling in 3D but not in 2D culture. These data indicate a distinct rewiring of signaling in 3D culture and during treatment. Detached tumor-cell clusters in vessels, in addition to circulating single tumor cells, play a putative role in metastasis in human cancers. Hence, the understanding of signaling in spheroids and the responses in the 3D models upon drug treatment might be beneficial for anti-cancer therapies.
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Affiliation(s)
- Angelika Riedl
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, Vienna A-1090, Austria
| | - Michaela Schlederer
- Clinical Institute of Pathology, Medical University of Vienna, Währinger Gürtel 18-20, Vienna A-1090, Austria.,Ludwig Boltzmann Institute for Cancer Research, Währinger Strasse 13A, Vienna 1090, Austria
| | - Karoline Pudelko
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, Vienna A-1090, Austria
| | - Mira Stadler
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, Vienna A-1090, Austria
| | - Stefanie Walter
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, Vienna A-1090, Austria
| | - Daniela Unterleuthner
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, Vienna A-1090, Austria
| | - Christine Unger
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, Vienna A-1090, Austria
| | - Nina Kramer
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, Vienna A-1090, Austria
| | - Markus Hengstschläger
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, Vienna A-1090, Austria
| | - Lukas Kenner
- Clinical Institute of Pathology, Medical University of Vienna, Währinger Gürtel 18-20, Vienna A-1090, Austria.,Ludwig Boltzmann Institute for Cancer Research, Währinger Strasse 13A, Vienna 1090, Austria.,Unit of Pathology of Laboratory Animals (UPLA), University of Veterinary Medicine Vienna, Vienna 1210, Austria
| | - Dagmar Pfeiffer
- Institute of Cell Biology, Histology and Embryology, Medical University of Graz, Harrachgasse 21, Graz 8010, Austria
| | - Georg Krupitza
- Clinical Institute of Pathology, Medical University of Vienna, Währinger Gürtel 18-20, Vienna A-1090, Austria
| | - Helmut Dolznig
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, Vienna A-1090, Austria
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Khan Z, Marshall JF. The role of integrins in TGFβ activation in the tumour stroma. Cell Tissue Res 2016; 365:657-73. [PMID: 27515461 PMCID: PMC5010607 DOI: 10.1007/s00441-016-2474-y] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 07/07/2016] [Indexed: 12/27/2022]
Abstract
TGFβ1 is the most pleiotropic of all known cytokines and thus, to avoid uncontrolled TGFβ-activated processes, its activity is tightly regulated. Studies in fibrosis have led to the discovery that αv integrins are the major regulators of the local activation of latent TGFβ in our tissues. Since all cells can express one or more types of αv integrins, this raises the possibility that, in the complex milieu of a developing cancer, multiple cell types including both cancer cells and stromal cells activate TGFβ. In normal tissues, TGFβ1 is a tumour suppressor through its ability to suppress epithelial cell division, whereas in cancer, in which tumour cells develop genetic escape mechanisms to become resistant to TGFβ growth suppression, TGFβ signalling creates a tumour-permissive environment by activating fibroblast-to-myofibroblast transition, by promoting angiogenesis, by suppressing immune cell populations and by promoting the secretion of both matrix proteins and proteases. In addition, TGFβ drives epithelial-to-mesenchymal transition (EMT) increasing the potential for metastasis. Since αv integrins activate TGFβ, they almost certainly drive TGFβ-dependent cancer progression. In this review, we discuss the data that are helping to develop this hypothesis and describe the evidence that αv integrins regulate the TGFβ promotion of cancer. Graphical Abstract Mechanisms of integrin-mediated transforming growth factor beta (TGFβ) activation and its effect on stromal processes. 1 Matrix-bound latent LAP-TGFβ1 binds αv integrins expressed by epithelial cells or fibroblasts (LAP latency-associated peptide). TGFβ1 becomes exposed. 2 Active TGFβ1 binds the TGFβ receptor in an autocrine or paracrine fashion. 3 TGFβ1 signalling increases integrin expression, LAP-TGFβ1 secretion and trans-differentiation of fibroblasts into contractile cells that secrete collagens and collagen cross-linking proteins. By contracting the matrix, latent TGFβ1 is stretched making the activation of latent TGFβ1 easier and creating a continuous cycle of TGFβ1 signalling. TGFβ1 promotes cancer progression by promoting angiogenesis, immune suppression and epithelial-to-mesenchymal transition (EMT).
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Affiliation(s)
- Zareen Khan
- Centre for Tumour Biology, Barts Cancer Institute, Queen Mary University of London, London, UK
| | - John F. Marshall
- Centre for Tumour Biology, Barts Cancer Institute, Queen Mary University of London, London, UK
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