1
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Sattiraju A, Kang S, Giotti B, Chen Z, Marallano VJ, Brusco C, Ramakrishnan A, Shen L, Tsankov AM, Hambardzumyan D, Friedel RH, Zou H. Hypoxic niches attract and sequester tumor-associated macrophages and cytotoxic T cells and reprogram them for immunosuppression. Immunity 2023; 56:1825-1843.e6. [PMID: 37451265 PMCID: PMC10527169 DOI: 10.1016/j.immuni.2023.06.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 02/24/2023] [Accepted: 06/19/2023] [Indexed: 07/18/2023]
Abstract
Glioblastoma (GBM), a highly lethal brain cancer, is notorious for immunosuppression, but the mechanisms remain unclear. Here, we documented a temporospatial patterning of tumor-associated myeloid cells (TAMs) corresponding to vascular changes during GBM progression. As tumor vessels transitioned from the initial dense regular network to later scant and engorged vasculature, TAMs shifted away from perivascular regions and trafficked to vascular-poor areas. This process was heavily influenced by the immunocompetence state of the host. Utilizing a sensitive fluorescent UnaG reporter to track tumor hypoxia, coupled with single-cell transcriptomics, we revealed that hypoxic niches attracted and sequestered TAMs and cytotoxic T lymphocytes (CTLs), where they were reprogrammed toward an immunosuppressive state. Mechanistically, we identified chemokine CCL8 and cytokine IL-1β as two hypoxic-niche factors critical for TAM trafficking and co-evolution of hypoxic zones into pseudopalisading patterns. Therefore, perturbation of TAM patterning in hypoxic zones may improve tumor control.
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Affiliation(s)
- Anirudh Sattiraju
- Nash Family Department of Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Sangjo Kang
- Nash Family Department of Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Bruno Giotti
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Zhihong Chen
- Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Oncological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Valerie J Marallano
- Nash Family Department of Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Concetta Brusco
- Nash Family Department of Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Aarthi Ramakrishnan
- Nash Family Department of Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Li Shen
- Nash Family Department of Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Alexander M Tsankov
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Dolores Hambardzumyan
- Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Oncological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Roland H Friedel
- Nash Family Department of Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
| | - Hongyan Zou
- Nash Family Department of Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
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2
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Cui Y, Wang Y, Men C, Wu J, Liu L. Bioinformatics-Based Identification of Potential Hypoxia-Related Genes Associated With Peyronie's Disease. Am J Mens Health 2022; 16:15579883221111720. [PMID: 35894424 PMCID: PMC9340336 DOI: 10.1177/15579883221111720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Hypoxia is one of the most important predisposing conditions for Peyronie’s disease (PD)
and the pathogenetic mechanism is yet to be completely elucidated. This study applied
bioinformatic approaches to select candidate hypoxia-related genes involved in the
pathogenesis of PD. The Gene Expression Omnibus (GEO) data set GSE146500 was introduced to
compare the transcriptional profiling between normal and PD samples. The differential
expression of hypoxia-related gene was determined with R software. On the selected
candidate genes, further functional analyses were applied, including protein–protein
interactions (PPIs), gene correlation, gene ontology (GO), and Kyoto Encyclopedia of Genes
and Genomes (KEGG) pathway. A total of 66 candidate genes (24 candidates overexpressed in
PD and 42 showing reduced expression in PD) were distinguished according to the
differential expression between human fibroblast cells from normal and PD patients. The
interactions among these candidate genes were recognized according to PPI analysis. The
functional enrichment analyses revealed the potential modulatory functions of the
candidate genes in some major biological processes, especially in
glycolysis/gluconeogenesis and carbon metabolism. The findings would facilitate further
study on the pathogenesis of PD, which might consequently promote the improvement of
clinical strategies against PD.
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Affiliation(s)
- Yuanshan Cui
- Department of Urology, The Affiliated Yantai Yuhuangding Hospital, Qingdao University, Yantai, China
| | - Yajuan Wang
- Department of Admission Center, The Affiliated Yantai Yuhuangding Hospital, Qingdao University, Yantai, China
| | - Changping Men
- Department of Urology, The Affiliated Yantai Yuhuangding Hospital, Qingdao University, Yantai, China
| | - Jitao Wu
- Department of Urology, The Affiliated Yantai Yuhuangding Hospital, Qingdao University, Yantai, China
| | - Lingling Liu
- Department of Urology, The Affiliated Yantai Yuhuangding Hospital, Qingdao University, Yantai, China
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3
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Wei X, Hou Y, Long M, Jiang L, Du Y. Molecular mechanisms underlying the role of hypoxia-inducible factor-1 α in metabolic reprogramming in renal fibrosis. Front Endocrinol (Lausanne) 2022; 13:927329. [PMID: 35957825 PMCID: PMC9357883 DOI: 10.3389/fendo.2022.927329] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Accepted: 06/30/2022] [Indexed: 11/13/2022] Open
Abstract
Renal fibrosis is the result of renal tissue damage and repair response disorders. If fibrosis is not effectively blocked, it causes loss of renal function, leading to chronic renal failure. Metabolic reprogramming, which promotes cell proliferation by regulating cellular energy metabolism, is considered a unique tumor cell marker. The transition from oxidative phosphorylation to aerobic glycolysis is a major feature of renal fibrosis. Hypoxia-inducible factor-1 α (HIF-1α), a vital transcription factor, senses oxygen status, induces adaptive changes in cell metabolism, and plays an important role in renal fibrosis and glucose metabolism. This review focuses on the regulation of proteins related to aerobic glycolysis by HIF-1α and attempts to elucidate the possible regulatory mechanism underlying the effects of HIF-1α on glucose metabolism during renal fibrosis, aiming to provide new ideas for targeted metabolic pathway intervention in renal fibrosis.
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Affiliation(s)
- Xuejiao Wei
- Department of Nephrology, The First Hospital of Jilin University, Changchun, China
| | - Yue Hou
- Department of Nephrology, The First Hospital of Jilin University, Changchun, China
| | - Mengtuan Long
- Department of Nephrology, The First Hospital of Jilin University, Changchun, China
| | - Lili Jiang
- Department of Physical Examination Center, The First Hospital of Jilin University, Changchun, China
| | - Yujun Du
- Department of Nephrology, The First Hospital of Jilin University, Changchun, China
- *Correspondence: Yujun Du,
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4
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Zandberg DP, Menk AV, Velez M, Normolle D, DePeaux K, Liu A, Ferris RL, Delgoffe GM. Tumor hypoxia is associated with resistance to PD-1 blockade in squamous cell carcinoma of the head and neck. J Immunother Cancer 2021; 9:e002088. [PMID: 33986123 PMCID: PMC8126285 DOI: 10.1136/jitc-2020-002088] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/14/2021] [Indexed: 02/04/2023] Open
Abstract
The majority of patients with recurrent/metastatic squamous cell carcinoma of the head and neck (HNSCC) (R/M) do not benefit from anti-PD-1 therapy. Hypoxia induced immunosuppression may be a barrier to immunotherapy. Therefore, we examined the metabolic effect of anti-PD-1 therapy in a murine MEER HNSCC model as well as intratumoral hypoxia in R/M patients. In order to characterize the tumor microenvironment in PD-1 resistance, a MEER cell line was created from the parental line that are completely resistant to anti-PD-1. These cell lines were then metabolically profiled using seahorse technology and injected into C57/BL6 mice. After tumor growth, mice were pulsed with pimonidazole and immunofluorescent imaging was performed to analyze hypoxia and T cell infiltration. To validate the preclinical results, we analyzed tissues from R/M patients (n=36) treated with anti-PD-1 mAb, via immunofluorescent imaging for number of CD8+ T cells (CD8), Tregs and the percent area (CAIX) and mean intensity (I) of carbonic anhydrase IX in tumor. We analyzed disease control rate (DCR), progression free survival (PFS), and overall survival (OS) using proportional odds and proportional hazards (Cox) regression. We found that anti-PD-1 resistant MEER has significantly higher oxidative metabolism, while there was no difference in glycolytic metabolism. Intratumoral hypoxia was significantly increased and CD8+ T cells decreased in anti-PD-1 resistant tumors compared with parental tumors in the same mouse. In R/M patients, lower tumor hypoxia by CAIX/I was significantly associated with DCR (p=0.007), PFS, and OS, and independently associated with response (p=0.028) and PFS (p=0.04) in a multivariate model including other significant immune factors. During PD-1 resistance, tumor cells developed increased oxidative metabolism leading to increased intratumoral hypoxia and a decrease in CD8+ T cells. Lower tumor hypoxia was independently associated with increased efficacy of anti-PD-1 therapy in patients with R/M HNSCC. To our knowledge this is the first analysis of the effect of hypoxia in this patient population and highlights its importance not only as a predictive biomarker but also as a potential target for therapeutic intervention.
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Affiliation(s)
| | - Ashley V Menk
- Tumor Microenvironment Center, UPMC Hillman Cancer Center, Pittsburgh, PA, USA
| | - Maria Velez
- UPMC Hillman Cancer Center, Pittsburgh, PA, USA
| | | | - Kristin DePeaux
- Tumor Microenvironment Center, UPMC Hillman Cancer Center, Pittsburgh, PA, USA
- Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Angen Liu
- UPMC Hillman Cancer Center, Pittsburgh, PA, USA
| | - Robert L Ferris
- UPMC Hillman Cancer Center, Pittsburgh, PA, USA
- Tumor Microenvironment Center, UPMC Hillman Cancer Center, Pittsburgh, PA, USA
| | - Greg M Delgoffe
- Tumor Microenvironment Center, UPMC Hillman Cancer Center, Pittsburgh, PA, USA
- Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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5
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Agarwal S, Gulaka PK, Rastogi U, Kodibagkar VD. More bullets for PISTOL: linear and cyclic siloxane reporter probes for quantitative 1H MR oximetry. Sci Rep 2020; 10:1399. [PMID: 31996701 PMCID: PMC6989524 DOI: 10.1038/s41598-020-57889-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 12/18/2019] [Indexed: 12/12/2022] Open
Abstract
Tissue oximetry can assist in diagnosis and prognosis of many diseases and enable personalized therapy. Previously, we reported the ability of hexamethyldisiloxane (HMDSO) for accurate measurements of tissue oxygen tension (pO2) using Proton Imaging of Siloxanes to map Tissue Oxygenation Levels (PISTOL) magnetic resonance imaging. Here we report the feasibility of several commercially available linear and cyclic siloxanes (molecular weight 162–410 g/mol) as PISTOL-based oxygen reporters by characterizing their calibration constants. Further, field and temperature dependence of pO2 calibration curves of HMDSO, octamethyltrisiloxane (OMTSO) and polydimethylsiloxane (PDMSO) were also studied. The spin-lattice relaxation rate R1 of all siloxanes studied here exhibited a linear relationship with oxygenation (R1 = A′ + B′*pO2) at all temperatures and field strengths evaluated here. The sensitivity index η( = B′/A′) decreased with increasing molecular weight with values ranged from 4.7 × 10−3–11.6 × 10−3 torr−1 at 4.7 T. No substantial change in the anoxic relaxation rate and a slight decrease in pO2 sensitivity was observed at higher magnetic fields of 7 T and 9.4 T for HMDSO and OMTSO. Temperature dependence of calibration curves for HMDSO, OMTSO and PDMSO was small and simulated errors in pO2 measurement were 1–2 torr/°C. In summary, we have demonstrated the feasibility of various linear and cyclic siloxanes as pO2-reporters for PISTOL-based oximetry.
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Affiliation(s)
- Shubhangi Agarwal
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, 85295, USA
| | - Praveen K Gulaka
- Department of Radiology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA
| | - Ujjawal Rastogi
- Department of Radiology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA
| | - Vikram D Kodibagkar
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, 85295, USA.
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6
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Najjar YG, Menk AV, Sander C, Rao U, Karunamurthy A, Bhatia R, Zhai S, Kirkwood JM, Delgoffe GM. Tumor cell oxidative metabolism as a barrier to PD-1 blockade immunotherapy in melanoma. JCI Insight 2019; 4:124989. [PMID: 30721155 PMCID: PMC6483505 DOI: 10.1172/jci.insight.124989] [Citation(s) in RCA: 147] [Impact Index Per Article: 29.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 01/29/2019] [Indexed: 12/24/2022] Open
Abstract
The tumor microenvironment presents physical, immunologic, and metabolic barriers to durable immunotherapy responses. We have recently described roles for both T cell metabolic insufficiency as well as tumor hypoxia as inhibitory mechanisms that prevent T cell activity in murine tumors, but whether intratumoral T cell activity or response to immunotherapy varies between patients as a function of distinct metabolic profiles in tumor cells remains unclear. Here, we show that metabolic derangement can vary widely in both degree and type in patient-derived cell lines and in ex vivo analysis of patient samples, such that some cells demonstrate solely deregulated oxidative or glycolytic metabolism. Further, deregulated oxidative, but not glycolytic, metabolism was associated with increased generation of hypoxia upon implantation into immunodeficient animals. Generation of murine single-cell melanoma cell lines that lacked either oxidative or glycolytic metabolism showed that elevated tumor oxygen consumption was associated with increased T cell exhaustion and decreased immune activity. Moreover, melanoma lines lacking oxidative metabolism were solely responsive to anti-PD-1 therapy among those tested. Prospective analysis of patient sample immunotherapy revealed that oxidative, but not glycolytic, metabolism was associated with progression on PD-1 blockade. Our data highlight a role for oxygen as a crucial metabolite required for the tumor-infiltrating T cells to differentiate appropriately upon PD-1 blockade, and suggest that tumor oxidative metabolism may be a target to improve immunotherapeutic response.
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Affiliation(s)
| | - Ashley V. Menk
- Tumor Microenvironment Center, UPMC Hillman Cancer Center, Pittsburgh, Pennsylvania, USA
| | | | | | | | | | | | | | - Greg M. Delgoffe
- Tumor Microenvironment Center, UPMC Hillman Cancer Center, Pittsburgh, Pennsylvania, USA
- Department of Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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7
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Liu P, Peng J, Han GH, Ding X, Wei S, Gao G, Huang K, Chang F, Wang Y. Role of macrophages in peripheral nerve injury and repair. Neural Regen Res 2019; 14:1335-1342. [PMID: 30964051 PMCID: PMC6524518 DOI: 10.4103/1673-5374.253510] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Resident and inflammatory macrophages are essential effectors of the innate immune system. These cells provide innate immune defenses and regulate tissue and organ homeostasis. In addition to their roles in diseases such as cancer, obesity and osteoarthritis, they play vital roles in tissue repair and disease rehabilitation. Macrophages and other inflammatory cells are recruited to tissue injury sites where they promote changes in the microenvironment. Among the inflammatory cell types, only macrophages have both pro-inflammatory (M1) and anti-inflammatory (M2) actions, and M2 macrophages have four subtypes. The co-action of M1 and M2 subtypes can create a favorable microenvironment, releasing cytokines for damaged tissue repair. In this review, we discuss the activation of macrophages and their roles in severe peripheral nerve injury. We also describe the therapeutic potential of macrophages in nerve tissue engineering treatment and highlight approaches for enhancing M2 cell-mediated nerve repair and regeneration.
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Affiliation(s)
- Ping Liu
- Shanxi Medical University, Taiyuan, Shanxi Province; Institute of Orthopedics, Chinese PLA General Hospital, Beijing, China
| | - Jiang Peng
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing, China
| | - Gong-Hai Han
- Kunming Medical University, Kunming, Yunnan Province, China
| | - Xiao Ding
- Shihezi University Medical College, Shihezi, Xinjiang Uygur Autonomous Region, China
| | - Shuai Wei
- Shihezi University Medical College, Shihezi, Xinjiang Uygur Autonomous Region, China
| | - Gang Gao
- Department of Orthopaedic Surgery, Shanxi Provincial People's Hospital, Shanxi Medical University, Taiyuan, Shanxi Province, China
| | - Kun Huang
- Anhui Medical University Air Force Clinical College, Hefei, Anhui Province, China
| | - Feng Chang
- Department of Orthopaedic Surgery, Shanxi Provincial People's Hospital, Shanxi Medical University, Taiyuan, Shanxi Province, China
| | - Yu Wang
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing, China
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8
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Lhuillier C, Vanpouille-Box C, Galluzzi L, Formenti SC, Demaria S. Emerging biomarkers for the combination of radiotherapy and immune checkpoint blockers. Semin Cancer Biol 2018; 52:125-134. [PMID: 29258856 PMCID: PMC6004231 DOI: 10.1016/j.semcancer.2017.12.007] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 12/11/2017] [Accepted: 12/13/2017] [Indexed: 12/19/2022]
Abstract
Over the past few years, multiple immune checkpoint blockers (ICBs) have achieved unprecedented clinical success and have been approved by regulatory agencies for the treatment of an increasing number of malignancies. However, only a limited fraction of patients responds to ICBs employed as a standalone intervention, calling for the development of combinatorial regimens. Radiation therapy (RT) stands out as a very promising candidate for this purpose. Indeed, RT mediates antineoplastic effects not only by cytotoxic and cytostatic mechanisms, but also by modulating immunological functions, both locally (within the irradiated field) and systemically. As combinatorial regimens involving RT and ICBs are being developed and clinically tested at an accelerating pace, it is paramount to identify biomarkers that reliably predict the likelihood of individual patients to respond. Here, we discuss emerging biomarkers that may potentially predict the response of cancer patients to RT plus ICBs.
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Affiliation(s)
- Claire Lhuillier
- Department of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA
| | | | - Lorenzo Galluzzi
- Department of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA; Sandra and Edward Meyer Cancer Center, New York, NY, USA
| | - Silvia Chiara Formenti
- Department of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA; Sandra and Edward Meyer Cancer Center, New York, NY, USA
| | - Sandra Demaria
- Department of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA; Sandra and Edward Meyer Cancer Center, New York, NY, USA; Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY, USA.
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9
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Däster S, Amatruda N, Calabrese D, Ivanek R, Turrini E, Droeser RA, Zajac P, Fimognari C, Spagnoli GC, Iezzi G, Mele V, Muraro MG. Induction of hypoxia and necrosis in multicellular tumor spheroids is associated with resistance to chemotherapy treatment. Oncotarget 2018; 8:1725-1736. [PMID: 27965457 PMCID: PMC5352092 DOI: 10.18632/oncotarget.13857] [Citation(s) in RCA: 135] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 09/19/2016] [Indexed: 12/11/2022] Open
Abstract
Culture of cancerous cells in standard monolayer conditions poorly mirrors growth in three-dimensional architectures typically observed in a wide majority of cancers of different histological origin. Multicellular tumor spheroid (MCTS) culture models were developed to mimic these features. However, in vivo tumor growth is also characterized by the presence of ischemic and necrotic areas generated by oxygenation gradients and differential access to nutrients. Hypoxia and necrosis play key roles in tumor progression and resistance to treatment. To provide in vitro models recapitulating these events in highly controlled and standardized conditions, we have generated colorectal cancer (CRC) cell spheroids of different sizes and analyzed their gene expression profiles and sensitivity to treatment with 5FU, currently used in therapeutic protocols. Here we identify three MCTS stages, corresponding to defined spheroid sizes, characterized by normoxia, hypoxia, and hypoxia plus necrosis, respectively. Importantly, we show that MCTS including both hypoxic and necrotic areas most closely mimic gene expression profiles of in vivo-developing tumors and display the highest resistance to 5FU. Taken together, our data indicate that MCTS may mimic in vitro generation of ischemic and necrotic areas in highly standardized and controlled conditions, thereby qualifying as relevant models for drug screening purposes.
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Affiliation(s)
- Silvio Däster
- Department of Surgery, University Hospital Basel, Basel, Switzerland
| | - Nunzia Amatruda
- Department of Surgery, University Hospital Basel, Basel, Switzerland.,Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Diego Calabrese
- Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Robert Ivanek
- Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Eleonora Turrini
- Department for Life Quality Studies, University of Bologna, Rimini, Italy
| | - Raoul A Droeser
- Department of Surgery, University Hospital Basel, Basel, Switzerland
| | - Paul Zajac
- Department of Surgery, University Hospital Basel, Basel, Switzerland.,Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Carmela Fimognari
- Department for Life Quality Studies, University of Bologna, Rimini, Italy
| | - Giulio C Spagnoli
- Department of Surgery, University Hospital Basel, Basel, Switzerland.,Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Giandomenica Iezzi
- Department of Surgery, University Hospital Basel, Basel, Switzerland.,Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Valentina Mele
- Department of Surgery, University Hospital Basel, Basel, Switzerland.,Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Manuele G Muraro
- Department of Surgery, University Hospital Basel, Basel, Switzerland.,Department of Biomedicine, University of Basel, Basel, Switzerland
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10
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Darby IA, Hewitson TD. Hypoxia in tissue repair and fibrosis. Cell Tissue Res 2016; 365:553-62. [DOI: 10.1007/s00441-016-2461-3] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2016] [Accepted: 06/23/2016] [Indexed: 12/23/2022]
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11
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Cattin AL, Burden JJ, Van Emmenis L, Mackenzie FE, Hoving JJA, Garcia Calavia N, Guo Y, McLaughlin M, Rosenberg LH, Quereda V, Jamecna D, Napoli I, Parrinello S, Enver T, Ruhrberg C, Lloyd AC. Macrophage-Induced Blood Vessels Guide Schwann Cell-Mediated Regeneration of Peripheral Nerves. Cell 2015; 162:1127-39. [PMID: 26279190 PMCID: PMC4553238 DOI: 10.1016/j.cell.2015.07.021] [Citation(s) in RCA: 575] [Impact Index Per Article: 63.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2015] [Revised: 06/11/2015] [Accepted: 06/30/2015] [Indexed: 12/22/2022]
Abstract
The peripheral nervous system has remarkable regenerative capacities in that it can repair a fully cut nerve. This requires Schwann cells to migrate collectively to guide regrowing axons across a 'bridge' of new tissue, which forms to reconnect a severed nerve. Here we show that blood vessels direct the migrating cords of Schwann cells. This multicellular process is initiated by hypoxia, selectively sensed by macrophages within the bridge, which via VEGF-A secretion induce a polarized vasculature that relieves the hypoxia. Schwann cells then use the blood vessels as "tracks" to cross the bridge taking regrowing axons with them. Importantly, disrupting the organization of the newly formed blood vessels in vivo, either by inhibiting the angiogenic signal or by re-orienting them, compromises Schwann cell directionality resulting in defective nerve repair. This study provides important insights into how the choreography of multiple cell-types is required for the regeneration of an adult tissue.
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Affiliation(s)
- Anne-Laure Cattin
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | - Jemima J Burden
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | - Lucie Van Emmenis
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | - Francesca E Mackenzie
- Department of Cell Biology, UCL Institute of Ophthalmology, 11-43 Bath Street, London EC1V 9EL, UK
| | - Julian J A Hoving
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | | | - Yanping Guo
- UCL Cancer Institute, UCL, 72 Huntley Street, London WC1E 6DD, UK
| | - Maeve McLaughlin
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | - Laura H Rosenberg
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | - Victor Quereda
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | - Denisa Jamecna
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | - Ilaria Napoli
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | - Simona Parrinello
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK
| | - Tariq Enver
- UCL Cancer Institute, UCL, 72 Huntley Street, London WC1E 6DD, UK
| | - Christiana Ruhrberg
- Department of Cell Biology, UCL Institute of Ophthalmology, 11-43 Bath Street, London EC1V 9EL, UK
| | - Alison C Lloyd
- MRC Laboratory for Molecular Cell Biology, UCL, Gower Street, London WC1E 6BT, UK; UCL Cancer Institute, UCL, 72 Huntley Street, London WC1E 6DD, UK.
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12
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Chang E, Liu H, Unterschemmann K, Ellinghaus P, Liu S, Gekeler V, Cheng Z, Berndorff D, Gambhir SS. 18F-FAZA PET imaging response tracks the reoxygenation of tumors in mice upon treatment with the mitochondrial complex I inhibitor BAY 87-2243. Clin Cancer Res 2014; 21:335-46. [PMID: 25381339 DOI: 10.1158/1078-0432.ccr-14-0217] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
PURPOSE We describe a noninvasive PET imaging method that monitors early therapeutic efficacy of BAY 87-2243, a novel small-molecule inhibitor of mitochondrial complex I as a function of hypoxia-inducible factor-1α (HIF1α) activity. EXPERIMENTAL DESIGN Four PET tracers [(18)F-FDG, (18)F-Fpp(RGD)2, (18)F-FLT, and (18)F-FAZA] were assessed for uptake into tumor xenografts of drug-responsive (H460, PC3) or drug-resistant (786-0) carcinoma cells. Mice were treated with BAY 87-2243 or vehicle. At each point, RNA from treated and vehicle H460 tumor xenografts (n = 3 each) was isolated and analyzed for target genes. RESULTS Significant changes in uptake of (18)F-FAZA, (18)F-FLT, and (18)F-Fpp(RGD)2 (P < 0.01) occurred with BAY 87-2243 treatment with (18)F-FAZA being the most prominent. (18)F-FDG uptake was unaffected. (18)F-FAZA tumor uptake declined by 55% to 70% (1.21% ± 0.10%ID/g to 0.35 ± 0.1%ID/g; n = 6, vehicle vs. treatment) in both H460 (P < 0.001) and PC3 (P < 0.05) xenografts 1 to 3 days after drug administration. (18)F-FAZA uptake in 786-0 xenografts was unaffected. Decline occurred before significant differences in tumor volume, thus suggesting (18)F-FAZA decrease reflected early changes in tumor metabolism. BAY 87-2243 reduced expression of hypoxia-regulated genes CA IX, ANGPTL4, and EGLN-3 by 99%, 93%, and 83%, respectively (P < 0.001 for all), which corresponds with reduced (18)F-FAZA uptake upon drug treatment. Heterogeneous expression of genes associated with glucose metabolism, vessel density, and proliferation was observed. CONCLUSIONS Our studies suggest suitability of (18)F-FAZA-PET as an early pharmacodynamic monitor on the efficacy of anticancer agents that target the mitochondrial complex I and intratumor oxygen levels (e.g., BAY 87-2243).
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Affiliation(s)
- Edwin Chang
- Department of Radiology, Molecular Imaging Program at Stanford, Canary Center for Early Cancer Detection, Stanford University, Palo Alto, California
| | - Hongguang Liu
- Department of Radiology, Molecular Imaging Program at Stanford, Canary Center for Early Cancer Detection, Stanford University, Palo Alto, California
| | | | | | - Shuanglong Liu
- Department of Radiology, Molecular Imaging Program at Stanford, Canary Center for Early Cancer Detection, Stanford University, Palo Alto, California
| | | | - Zhen Cheng
- Department of Radiology, Molecular Imaging Program at Stanford, Canary Center for Early Cancer Detection, Stanford University, Palo Alto, California
| | | | - Sanjiv S Gambhir
- Department of Radiology, Molecular Imaging Program at Stanford, Canary Center for Early Cancer Detection, Stanford University, Palo Alto, California.
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Abstract
SIGNIFICANCE Most solid tumors contain regions of low oxygenation or hypoxia. Tumor hypoxia has been associated with a poor clinical outcome and plays a critical role in tumor radioresistance. RECENT ADVANCES Two main types of hypoxia exist in the tumor microenvironment: chronic and cycling hypoxia. Chronic hypoxia results from the limited diffusion distance of oxygen, and cycling hypoxia primarily results from the variation in microvessel red blood cell flux and temporary disturbances in perfusion. Chronic hypoxia may cause either tumor progression or regressive effects depending on the tumor model. However, there is a general trend toward the development of a more aggressive phenotype after cycling hypoxia. With advanced hypoxia imaging techniques, spatiotemporal characteristics of tumor hypoxia and the changes to the tumor microenvironment can be analyzed. CRITICAL ISSUES In this review, we focus on the biological and clinical consequences of chronic and cycling hypoxia on radiation treatment. We also discuss the advanced non-invasive imaging techniques that have been developed to detect and monitor tumor hypoxia in preclinical and clinical studies. FUTURE DIRECTIONS A better understanding of the mechanisms of tumor hypoxia with non-invasive imaging will provide a basis for improved radiation therapeutic practices.
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Affiliation(s)
- Chen-Ting Lee
- 1 Department of Radiation Oncology, Duke University Medical Center , Durham, North Carolina
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Shao Y, Zhao FQ. Emerging evidence of the physiological role of hypoxia in mammary development and lactation. J Anim Sci Biotechnol 2014; 5:9. [PMID: 24444333 PMCID: PMC3929241 DOI: 10.1186/2049-1891-5-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Accepted: 01/17/2014] [Indexed: 01/22/2023] Open
Abstract
Hypoxia is a physiological or pathological condition of a deficiency of oxygen supply in the body as a whole or within a tissue. During hypoxia, tissues undergo a series of physiological responses to defend themselves against a low oxygen supply, including increased angiogenesis, erythropoiesis, and glucose uptake. The effects of hypoxia are mainly mediated by hypoxia-inducible factor 1 (HIF-1), which is a heterodimeric transcription factor consisting of α and β subunits. HIF-1β is constantly expressed, whereas HIF-1α is degraded under normal oxygen conditions. Hypoxia stabilizes HIF-1α and the HIF complex, and HIF then translocates into the nucleus to initiate the expression of target genes. Hypoxia has been extensively studied for its role in promoting tumor progression, and emerging evidence also indicates that hypoxia may play important roles in physiological processes, including mammary development and lactation. The mammary gland exhibits an increasing metabolic rate from pregnancy to lactation to support mammary growth, lactogenesis, and lactation. This process requires increasing amounts of oxygen consumption and results in localized chronic hypoxia as confirmed by the binding of the hypoxia marker pimonidazole HCl in mouse mammary gland. We hypothesized that this hypoxic condition promotes mammary development and lactation, a hypothesis that is supported by the following several lines of evidence: i) Mice with an HIF-1α deletion selective for the mammary gland have impaired mammary differentiation and lipid secretion, resulting in lactation failure and striking changes in milk compositions; ii) We recently observed that hypoxia significantly induces HIF-1α-dependent glucose uptake and GLUT1 expression in mammary epithelial cells, which may be responsible for the dramatic increases in glucose uptake and GLUT1 expression in the mammary gland during the transition period from late pregnancy to early lactation; and iii) Hypoxia and HIF-1α increase the phosphorylation of signal transducers and activators of transcription 5a (STAT5a) in mammary epithelial cells, whereas STAT5 phosphorylation plays important roles in the regulation of milk protein gene expression and mammary development. Based on these observations, hypoxia effects emerge as a new frontier for studying the regulation of mammary development and lactation.
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Affiliation(s)
| | - Feng-Qi Zhao
- Laboratory of Lactation and Metabolic Physiology, Department of Animal Science, University of Vermont, Burlington, Vermont 05405, USA.
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Király A, Váradi T, Hajdu T, Rühl R, Galmarini CM, Szöllősi J, Nagy P. Hypoxia reduces the efficiency of elisidepsin by inhibiting hydroxylation and altering the structure of lipid rafts. Mar Drugs 2013; 11:4858-75. [PMID: 24317474 PMCID: PMC3877891 DOI: 10.3390/md11124858] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 10/26/2013] [Accepted: 11/05/2013] [Indexed: 12/18/2022] Open
Abstract
The mechanism of action of elisidepsin (PM02734, Irvalec®) is assumed to involve membrane permeabilization via attacking lipid rafts and hydroxylated lipids. Here we investigate the role of hypoxia in the mechanism of action of elisidepsin. Culturing under hypoxic conditions increased the half-maximal inhibitory concentration and decreased the drug’s binding to almost all cell lines which was reversed by incubation of cells with 2-hydroxy palmitic acid. The expression of fatty acid 2-hydroxylase was strongly correlated with the efficiency of the drug and inversely correlated with the effect of hypoxia. Number and brightness analysis and fluorescence anisotropy experiments showed that hypoxia decreased the clustering of lipid rafts and altered the structure of the plasma membrane. Although the binding of elisidepsin to the membrane is non-cooperative, its membrane permeabilizing effect is characterized by a Hill coefficient of ~3.3. The latter finding is in agreement with elisidepsin-induced clusters of lipid raft-anchored GFP visualized by confocal microscopy. We propose that the concentration of elisidepsin needs to reach a critical level in the membrane above which elisidepsin induces the disruption of the cell membrane. Testing for tumor hypoxia or the density of hydroxylated lipids could be an interesting strategy to increase the efficiency of elisidepsin.
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Affiliation(s)
- Anna Király
- Department of Biophysics and Cell Biology, University of Debrecen, Nagyerdei krt. 98, Debrecen 4032, Hungary; E-Mails: (A.K.); (T.V.); (T.H.); (J.S.)
| | - Tímea Váradi
- Department of Biophysics and Cell Biology, University of Debrecen, Nagyerdei krt. 98, Debrecen 4032, Hungary; E-Mails: (A.K.); (T.V.); (T.H.); (J.S.)
| | - Tímea Hajdu
- Department of Biophysics and Cell Biology, University of Debrecen, Nagyerdei krt. 98, Debrecen 4032, Hungary; E-Mails: (A.K.); (T.V.); (T.H.); (J.S.)
| | - Ralph Rühl
- Department of Biochemistry and Molecular Biology, University of Debrecen, Nagyerdei krt. 98, Debrecen 4032, Hungary; E-Mail:
| | - Carlos M. Galmarini
- Cell Biology Department, PharmaMar, Avda de los Reyes 1, Pol. Ind. La Mina, Colmenar Viejo, Madrid 28770, Spain; E-Mail:
| | - János Szöllősi
- Department of Biophysics and Cell Biology, University of Debrecen, Nagyerdei krt. 98, Debrecen 4032, Hungary; E-Mails: (A.K.); (T.V.); (T.H.); (J.S.)
- MTA-DE Cell Biology and Signaling Research Group, University of Debrecen, Nagyerdei krt. 98, Debrecen 4032, Hungary
| | - Peter Nagy
- Department of Biophysics and Cell Biology, University of Debrecen, Nagyerdei krt. 98, Debrecen 4032, Hungary; E-Mails: (A.K.); (T.V.); (T.H.); (J.S.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +36-52-412-623; Fax: +36-52-532-201
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Tao L, Huang G, Shi S, Chen L. Bevacizumab improves the antitumor efficacy of adoptive cytokine-induced killer cells therapy in non-small cell lung cancer models. Med Oncol 2013; 31:777. [DOI: 10.1007/s12032-013-0777-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 11/16/2013] [Indexed: 01/08/2023]
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17
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Sceneay J, Liu MCP, Chen A, Wong CSF, Bowtell DDL, Möller A. The antioxidant N-acetylcysteine prevents HIF-1 stabilization under hypoxia in vitro but does not affect tumorigenesis in multiple breast cancer models in vivo. PLoS One 2013; 8:e66388. [PMID: 23840457 PMCID: PMC3688768 DOI: 10.1371/journal.pone.0066388] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2013] [Accepted: 05/05/2013] [Indexed: 12/13/2022] Open
Abstract
Intratumoral hypoxia is a poor prognostic factor associated with reduced disease-free survival in many cancer types, including breast cancer. Hypoxia encourages tumor cell proliferation, stimulates angiogenesis and lymphangiogenesis, and promotes epithelial-mesenchymal transition and metastasis. Tumor cells respond to a hypoxic state by stabilizing the Hif-1α subunit of the Hypoxia-Inducible Factor (HIF) transcription factor to promote expression of various tumor- and metastasis-promoting hypoxic response genes. The antioxidant N-acetylcysteine (NAC) was recently shown to prevent Hif-1α stabilization under hypoxia, and has been identified as a potential alternative method to target the hypoxic response in tumors. We utilized three orthotopic syngeneic murine models of breast cancer, the PyMT, EO771 and 4T1.2 models, to investigate the ability of NAC to modulate the hypoxic response in vitro and in vivo. While NAC prevented Hif-1α stabilization under hypoxia in vitro and increased levels of glutathione in the blood of mice in vivo, this did not translate to a difference in tumor growth or the hypoxic state of the tumor compared to untreated control mice. In addition, NAC treatment actually increased metastatic burden in an experimental metastasis model. This work raises questions regarding the validity of NAC as an anti-tumorigenic agent in breast cancer, and highlights the need to further investigate its properties in vivo in different cancer models.
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MESH Headings
- Acetylcysteine/pharmacology
- Animals
- Antineoplastic Agents/pharmacology
- Antioxidants/pharmacology
- Apoptosis/drug effects
- Carcinogenesis
- Cell Hypoxia
- Cell Line, Tumor
- Cell Proliferation/drug effects
- Drug Screening Assays, Antitumor
- Epithelial-Mesenchymal Transition
- Female
- Glutathione/blood
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Lung Neoplasms/blood supply
- Lung Neoplasms/drug therapy
- Lung Neoplasms/metabolism
- Lung Neoplasms/secondary
- Mammary Neoplasms, Experimental/blood supply
- Mammary Neoplasms, Experimental/drug therapy
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/pathology
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Neoplasm Transplantation
- Neovascularization, Pathologic/metabolism
- Neovascularization, Pathologic/pathology
- Neovascularization, Pathologic/prevention & control
- Phenotype
- Protein Stability
- Tumor Burden/drug effects
- Vascular Endothelial Growth Factor A/metabolism
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Affiliation(s)
- Jaclyn Sceneay
- Cancer Genomics and Genetics Laboratory, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia
- Department of Pathology, The University of Melbourne, Parkville, Victoria, Australia
- Tumour Microenvironment Laboratory, Queensland Institute of Medical Research, Herston, Queensland, Australia
| | - Mira C. P. Liu
- Cancer Genomics and Genetics Laboratory, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia
| | - Anna Chen
- Cancer Genomics and Genetics Laboratory, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia
- Department of Pathology, The University of Melbourne, Parkville, Victoria, Australia
| | - Christina S. F. Wong
- Tumour Microenvironment Laboratory, Queensland Institute of Medical Research, Herston, Queensland, Australia
| | - David D. L. Bowtell
- Cancer Genomics and Genetics Laboratory, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia
- Department of Pathology, The University of Melbourne, Parkville, Victoria, Australia
- Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Victoria, Australia
| | - Andreas Möller
- Tumour Microenvironment Laboratory, Queensland Institute of Medical Research, Herston, Queensland, Australia
- * E-mail:
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Lokmic Z, Musyoka J, Hewitson TD, Darby IA. Hypoxia and hypoxia signaling in tissue repair and fibrosis. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2012; 296:139-85. [PMID: 22559939 DOI: 10.1016/b978-0-12-394307-1.00003-5] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Following injury, vascular damage results in the loss of perfusion and consequent low oxygen tension (hypoxia) which may be exacerbated by a rapid influx of inflammatory and mesenchymal cells with high metabolic demands for oxygen. Changes in systemic and cellular oxygen concentrations induce tightly regulated response pathways that attempt to restore oxygen supply to cells and modulate cell function in hypoxic conditions. Most of these responses occur through the induction of the transcription factor hypoxia-inducible factor-1 (HIF-1) which regulates many processes needed for tissue repair during ischemia in the damaged tissue. HIF-1 transcriptionally upregulates expression of metabolic proteins (GLUT-1), adhesion proteins (integrins), soluble growth factors (TGF-β and VEGF), and extracellular matrix components (type I collagen and fibronectin), which enhance the repair process. For these reasons, HIF-1 is viewed as a positive regulator of wound healing and a potential regulator of organ repair and tissue fibrosis. Understanding the complex role of hypoxia in the loss of function in scarring tissues and biology of chronic wound, and organ repair will aid in the development of pharmaceutical agents that can redress the detrimental outcomes often seen in repair and scarring.
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Affiliation(s)
- Zerina Lokmic
- Department of Surgery, St. Vincent's Hospital, University of Melbourne, Fitzroy, Victoria, Australia
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Wong CSF, Sceneay J, House CM, Halse HM, Liu MCP, George J, Hunnam TCUP, Parker BS, Haviv I, Ronai Z, Cullinane C, Bowtell DD, Möller A. Vascular normalization by loss of Siah2 results in increased chemotherapeutic efficacy. Cancer Res 2012; 72:1694-704. [PMID: 22354750 DOI: 10.1158/0008-5472.can-11-3310] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Tumor hypoxia is associated with resistance to antiangiogenic therapy and poor prognosis. The Siah E3 ubiquitin ligases regulate the hypoxic response pathway by modulating the turnover of the master proangiogenic transcription factor hypoxia-inducible factor-1α (Hif-1α). In this study, we show that genetic deficiency in the Siah family member Siah2 results in vascular normalization and delayed tumor growth in an established transgenic model of aggressive breast cancer. Tumors arising in a Siah2(-/-) genetic background showed increased perfusion and pericyte-associated vasculature, similar to that occurring with antiangiogenic therapy. In support of the role of Siah2 in regulating levels of Hif-1α, expression of angiogenic factors was decreased in Siah2(-/-) tumors. Blood vessel normalization in Siah2(-/-) tumors resulted in an increased response to chemotherapy and prolonged survival. Together, our findings offer a preclinical proof of concept that targeting Siah2 is sufficient to attenuate Hif-1α-mediated angiogenesis and hypoxia signaling, thereby improving responses to chemotherapy.
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Affiliation(s)
- Christina S F Wong
- Cancer Genomics and Genetics, Peter MacCallum Cancer Centre, St Andrew's Place, East Melbourne, Victoria, Australia
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