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Yin J, Wang B, Zhu C, Sun C, Liu X. [Local injection of angiopoietin 2 promotes angiogenesis in tissue engineered bone and repair of bone defect with autophagy induction in vivo]. ZHONGGUO XIU FU CHONG JIAN WAI KE ZA ZHI = ZHONGGUO XIUFU CHONGJIAN WAIKE ZAZHI = CHINESE JOURNAL OF REPARATIVE AND RECONSTRUCTIVE SURGERY 2018; 32:1150-1156. [PMID: 30129346 PMCID: PMC8413973 DOI: 10.7507/1002-1892.201804105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 08/09/2018] [Indexed: 01/07/2023]
Abstract
Objective To investigate the mechanism of early vascularization of the tissue engineered bone in the treatment of rabbit radial bone defect by local injection of angiopoietin 2 (Ang-2). Methods A single 1.5 cm long radius defect model (left and right sides randomised) was constructed from 48 New Zealand white rabbits. After implantation of hydroxyapatite/collagen scaffolds in bone defects, the rabbits were randomly divided into 2 groups: control group (group A) and Ang-2 group (group B) were injected with 1 mL normal saline and 1 mL saline-soluble 400 ng/mL Ang-2 daily at the bone defect within 2 weeks after operation, respectively. Western blot was used to detect the expressions of autophagy related protein [microtubule associated protein 1 light chain 3 (LC3), Beclin-1], angiogenesis related protein [vascular endothelial growth factor (VEGF)], and autophagy degradable substrate protein (SQSTMl/p62) in callus. X-ray films examination and Lane-Sandhu X-ray scoring were performed to evaluate the bone defect repair at 4, 8, and 12 weeks after operation. The rabbits were sacrificed at 12 weeks after operation for gross observation, and the angiogenesis of bone defect was observed by HE staining. Results Western blot assay showed that the relative expression of LC3-II/LC3-I, Beclin-1, and VEGF in group B was significantly higher than that in group A, and the relative expression of SQSTMl/p62 was significantly lower than that in group A ( P<0.05). Radiographic and gross observation of specimens showed that only a small number of callus were formed in group A, the bone defect was not repaired; more callus were formed and complete repair of bone defect was observed in group B. The Lane-Sandhu scores in group B were significantly higher than those in group A at 4, 8, and 12 weeks after operation ( P<0.05). HE staining showed that the Harvard tubes in group B were well arranged and the number of new vessels was significantly higher than that in group A ( t=-11.879, P=0.000). Conclusion Local injection of appropriate concentration of Ang-2 may promote early vascularization and bone defect repair of rabbit tissue engineered bone by enhancing autophagy.
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Affiliation(s)
- Jian Yin
- Department of Orthopedics, the Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing Jiangsu, 211100, P.R.China
| | - Bin Wang
- Department of Orthopedics, the Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing Jiangsu, 211100, P.R.China
| | - Chao Zhu
- Department of Orthopedics, the Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing Jiangsu, 211100, P.R.China
| | - Chao Sun
- Department of Orthopedics, the Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing Jiangsu, 211100, P.R.China
| | - Xinhui Liu
- Department of Orthopedics, the Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing Jiangsu, 211100,
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Kang YE, Kim KS, Park SJ, Jung SN, Chang JW, Yi S, Jung MG, Kim JM, Koo BS. High Expression of Angiopoietin-1 is Associated with Lymph Node Metastasis and Invasiveness of Papillary Thyroid Carcinoma. World J Surg 2018; 41:3128-3138. [PMID: 28717903 DOI: 10.1007/s00268-017-4111-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
BACKGROUND We investigated the expression of angiopoietins in patients with papillary thyroid carcinoma (PTC) and the role of angiopoietins as biomarkers predicting the aggressiveness of PTC. METHODS Expression of angiopoietins was evaluated by immunohistochemistry of tumor specimens from patients with PTC. We demonstrated potential correlations between expression of angiopoietins and clinicopathologic features. RESULTS High expression of Ang-1 was positively correlated with a tumor size >1 cm, capsular invasion, extrathyroid extension, lymphovascular invasion, lymph node metastasis, and recurrence (P < 0.05). Moreover, multivariate analysis revealed that high expression of Ang-1 was an independent risk factor for lymph node metastasis (P < 0.001, odds ratio [OR] = 62.113) and lymphovascular invasion (P = 0.027, OR 4.405). However, there was no significant correlation between Ang-2 and clinicopathologic features. CONCLUSIONS Our results suggest that Ang-1 can serve as a valuable prognostic biomarker for lymph node metastasis and invasiveness in patients with PTC.
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Affiliation(s)
- Yea Eun Kang
- Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Republic of Korea
| | - Koon Soon Kim
- Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Republic of Korea
| | - Sung Jae Park
- Department of Otolaryngology-Head and Neck Surgery, Research Institute for Medical Sciences, Chungnam National University School of Medicine, 266 Munhwa-ro, Jung-gu, Daejeon, 301-721, Republic of Korea
| | - Seung-Nam Jung
- Department of Otolaryngology-Head and Neck Surgery, Research Institute for Medical Sciences, Chungnam National University School of Medicine, 266 Munhwa-ro, Jung-gu, Daejeon, 301-721, Republic of Korea
| | - Jae Won Chang
- Department of Otolaryngology-Head and Neck Surgery, Research Institute for Medical Sciences, Chungnam National University School of Medicine, 266 Munhwa-ro, Jung-gu, Daejeon, 301-721, Republic of Korea
| | - Shinae Yi
- Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Republic of Korea
| | - Min Gyu Jung
- Department of Pathology and Medical Sciences, Chungnam National University School of Medicine, 266, Munhwa-ro, Jung-gu, Daejeon, 301-721, Republic of Korea
| | - Jin-Man Kim
- Department of Pathology and Medical Sciences, Chungnam National University School of Medicine, 266, Munhwa-ro, Jung-gu, Daejeon, 301-721, Republic of Korea.
| | - Bon Seok Koo
- Department of Otolaryngology-Head and Neck Surgery, Research Institute for Medical Sciences, Chungnam National University School of Medicine, 266 Munhwa-ro, Jung-gu, Daejeon, 301-721, Republic of Korea.
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Itatani Y, Kawada K, Yamamoto T, Sakai Y. Resistance to Anti-Angiogenic Therapy in Cancer-Alterations to Anti-VEGF Pathway. Int J Mol Sci 2018; 19:ijms19041232. [PMID: 29670046 PMCID: PMC5979390 DOI: 10.3390/ijms19041232] [Citation(s) in RCA: 209] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 04/12/2018] [Accepted: 04/15/2018] [Indexed: 02/06/2023] Open
Abstract
Anti-angiogenic therapy is one of the promising strategies for many types of solid cancers. Bevacizumab (Avastin), a recombinant humanized monoclonal antibody of vascular endothelial growth factor (VEGF) A, was approved for the first time as an anti-angiogenic drug for the treatment of metastatic colorectal cancer (CRC) by the Food and Drug Administration (FDA) in 2004. In addition, the other VEGF pathway inhibitors including small molecule tyrosine kinase inhibitors (sunitinib, sorafenib, and pazopanib), a soluble VEGF decoy receptor (aflibercept), and a humanized monoclonal antibody of VEGF receptor 2 (VEGFR2) (ramucirumab) have been approved for cancer therapy. Although many types of VEGF pathway inhibitors can improve survival in most cancer patients, some patients have little or no beneficial effect from them. The primary or acquired resistance towards many oncological drugs, including anti-VEGF inhibitors, is a common problem in cancer treatment. This review summarizes the proposed alternative mechanisms of angiogenesis other than the VEGF pathway. These mechanisms are involved in the development of resistance to anti-VEGF therapies in cancer patients.
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Affiliation(s)
- Yoshiro Itatani
- Department of Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan.
| | - Kenji Kawada
- Department of Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan.
| | - Takamasa Yamamoto
- Department of Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan.
- Moores Cancer Center, University of California San Diego, San Diego, CA 92093, USA.
| | - Yoshiharu Sakai
- Department of Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan.
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Hyman DM, Rizvi N, Natale R, Armstrong DK, Birrer M, Recht L, Dotan E, Makker V, Kaley T, Kuruvilla D, Gribbin M, McDevitt J, Lai DW, Dar M. Phase I Study of MEDI3617, a Selective Angiopoietin-2 Inhibitor Alone and Combined with Carboplatin/Paclitaxel, Paclitaxel, or Bevacizumab for Advanced Solid Tumors. Clin Cancer Res 2018; 24:2749-2757. [PMID: 29559563 DOI: 10.1158/1078-0432.ccr-17-1775] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 01/25/2018] [Accepted: 03/15/2018] [Indexed: 01/04/2023]
Abstract
Purpose: This first-in-human study aimed to determine the MTD and safety of MEDI3617, a selective anti-angiopoietin-2 (Ang2) mAb, alone and combined with bevacizumab or cytotoxic chemotherapy.Patients and Methods: This phase I/Ib, multicenter, open-label, dose-escalation and dose-expansion study evaluated patients with advanced solid tumors. Patients received intravenous MEDI3617 as monotherapy [5-1,500 mg every 3 weeks (Q3W)] or with bevacizumab every 2 weeks (Q2W) or Q3W, weekly paclitaxel, or carboplatin plus paclitaxel Q3W. Dose expansions included a monotherapy cohort in platinum-resistant ovarian cancer and a bevacizumab combination cohort in bevacizumab-refractory malignant glioma. Safety/tolerability, pharmacokinetics, pharmacodynamics, and clinical activity were assessed.Results: We enrolled 116 patients. No formal MTD was identified (monotherapy or combination therapy). MEDI3617 demonstrated linear pharmacokinetics and maximal accumulation of peripheral Ang2 binding at doses above 300 mg Q3W. MEDI3617 monotherapy safety profile was acceptable, except in advanced ovarian cancer [prolonged grade 3 edema-associated adverse events (AE) occurred]. Otherwise, MEDI3617 combined with chemotherapy or bevacizumab was well tolerated. The AE profiles of MEDI3617 and bevacizumab were largely non-overlapping. Overall response rates in ovarian cancer and glioma monotherapy dose-expansion arms were 6% and 0%, respectively.Conclusions: Recommended MEDI3617 monotherapy dosage is 1,500 mg Q3W or 1,000 mg Q2W, except in ovarian cancer. Although peripheral edema has occurred with other Ang2 inhibitors, the severity and duration seen here in ovarian cancer potentially identifies a new, clinically significant safety signal for this class of agents. On the basis of limited clinical activity, MEDI3617 development was discontinued. Clin Cancer Res; 24(12); 2749-57. ©2018 AACR.
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Affiliation(s)
- David M Hyman
- Developmental Therapeutics, Memorial Sloan Kettering Cancer Center, New York, New York.
| | - Naiyer Rizvi
- Division of Hematology/Oncology, Columbia University Medical Center, New York, New York
| | - Ronald Natale
- Hematology/Oncology, Cedars-Sinai Medical Center, Los Angeles, California
| | | | - Michael Birrer
- Hematology/Oncology, Massachusetts General Hospital, Boston, Massachusetts
| | - Lawrence Recht
- Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, California
| | - Efrat Dotan
- Department of Medical Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Vicky Makker
- Developmental Therapeutics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Thomas Kaley
- Developmental Therapeutics, Memorial Sloan Kettering Cancer Center, New York, New York
| | | | - Matthew Gribbin
- Clinical Development Oncology, MedImmune, Gaithersburg, Maryland
| | | | - Dominic W Lai
- Clinical Development Oncology, MedImmune, Gaithersburg, Maryland
| | - Mohammed Dar
- Clinical Development Oncology, MedImmune, Gaithersburg, Maryland
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Abstract
Immunotherapy has emerged as a major therapeutic modality in oncology. Currently, however, the majority of patients with cancer do not derive benefit from these treatments. Vascular abnormalities are a hallmark of most solid tumours and facilitate immune evasion. These abnormalities stem from elevated levels of proangiogenic factors, such as VEGF and angiopoietin 2 (ANG2); judicious use of drugs targeting these molecules can improve therapeutic responsiveness, partially owing to normalization of the abnormal tumour vasculature that can, in turn, increase the infiltration of immune effector cells into tumours and convert the intrinsically immunosuppressive tumour microenvironment (TME) to an immunosupportive one. Immunotherapy relies on the accumulation and activity of immune effector cells within the TME, and immune responses and vascular normalization seem to be reciprocally regulated. Thus, combining antiangiogenic therapies and immunotherapies might increase the effectiveness of immunotherapy and diminish the risk of immune-related adverse effects. In this Perspective, we outline the roles of VEGF and ANG2 in tumour immune evasion and progression, and discuss the evidence indicating that antiangiogenic agents can normalize the TME. We also suggest ways that antiangiogenic agents can be combined with immune-checkpoint inhibitors to potentially improve patient outcomes, and highlight avenues of future research.
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56
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Shlamkovich T, Aharon L, Barton WA, Papo N. Utilizing combinatorial engineering to develop Tie2 targeting antagonistic angiopoetin-2 ligands as candidates for anti-angiogenesis therapy. Oncotarget 2018; 8:33571-33585. [PMID: 28422724 PMCID: PMC5464891 DOI: 10.18632/oncotarget.16827] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 03/24/2017] [Indexed: 11/25/2022] Open
Abstract
In many human cancers, the receptor tyrosine kinase (RTK) Tie2 plays important roles in mediating proliferation, survival, migration and angiogenesis. Thus, molecules that could potently inhibit activation of the Tie2 receptor would have a significant impact on cancer therapy. Nevertheless, attempts to develop Tie2-targeted inhibitors have met with little success, and there is currently no FDA-approved therapeutic selectively targeting Tie2. We used a combinatorial protein engineering approach to develop a new generation of angiopoietin (Ang)2-derived Tie2 antagonists as potential cancer therapeutics and as tools to study angiogenesis. The construct for designing a yeast surface display (YSD) library of potential antagonists was an Ang2 binding domain (Ang2-BD) that retains Tie2 binding ability but prevents ligand multimerization and receptor dimerization and activation. This mutant library was then screened by quantitative high-throughput flow cytometric sorting to identify Ang2-BD variants with increased expression, stability and affinity to Tie2. The selected variants were recombinantly expressed and showed high affinity to soluble and cellular Tie2 and strongly inhibited both Tie2 phosphorylation and endothelial capillary tube formation and cell invasion compared to the parental Ang2-BD. The significance of the study lies in the insight it provides into the sequence-structure-function relationships and mechanism of action of the antagonistic Ang mutants. The approach of using a natural protein ligand as a molecular scaffold for engineering high-affinity agents can be applied to other ligands to create functional protein antagonists against additional biomedical targets.
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Affiliation(s)
- Tomer Shlamkovich
- Department of Biotechnology Engineering, and the National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Lidan Aharon
- Department of Biotechnology Engineering, and the National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - William A Barton
- Virginia Commonwealth University, Department of Biochemistry and Molecular Biology, Richmond, Virginia, United States of America
| | - Niv Papo
- Department of Biotechnology Engineering, and the National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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57
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Abstract
Adenosquamous carcinoma of the pancreas (ASCP) is an uncommon variant of exocrine pancreatic malignancies, characterized by a histological admixture of adenomatous and squamous cell elements. This cancer is characterized by a poorly differentiated histology and a poorer clinical outcome compared to pancreatic ductal adenocarcinoma (PDAC). Unlike PDAC, that is characterized by a low microvascular density (MVD) and collapsed vasculature, no data are available about angiogenesis in ASPC. Immunohistochemical evaluation of MVD and trypatse-positive mast cells (MCs) were performed on a single case of ASCP compared to PDAC. Moreover, the levels of angiopoietin-1 and -2 (Ang-1, Ang-2), receptor tyrosine kinase with immunoglobulin and epidermal growth factor homology domain-2 (Tie-2), vascular endothelial growth factor A (VEGFA), hypoxia-inducible factor 1 alpha (HIF1A), miR-21-5p, miR-181a-5p, miR-122-5p, and miR-27a-3p were evaluated by real-time PCR. Higher number of tryptase-positive MCs and MVD are observed in the ASCP case compared to PDAC one. Lower levels of miR-122-5p and higher expression of VEGFA, HIF1A and Ang-2 genes were observed in ASCP. Furthermore, lower Ang-1 and Tie-2 transcript levels and higher increases of miR-21-5p, miR27a-3p and miR-181a-5p levels were found in the rarest form of pancreatic carcinoma. Our data demonstrate an important angiogenic activity in ASCP with a putative role of miR-21-5p, miR-181a-5p, miR-122-5p and miR-27a-3p in the regulation of this process.
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58
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Harney AS, Karagiannis GS, Pignatelli J, Smith BD, Kadioglu E, Wise SC, Hood MM, Kaufman MD, Leary CB, Lu WP, Al-Ani G, Chen X, Entenberg D, Oktay MH, Wang Y, Chun L, De Palma M, Jones JG, Flynn DL, Condeelis JS. The Selective Tie2 Inhibitor Rebastinib Blocks Recruitment and Function of Tie2 Hi Macrophages in Breast Cancer and Pancreatic Neuroendocrine Tumors. Mol Cancer Ther 2017; 16:2486-2501. [PMID: 28838996 DOI: 10.1158/1535-7163.mct-17-0241] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 07/12/2017] [Accepted: 08/10/2017] [Indexed: 01/22/2023]
Abstract
Tumor-infiltrating myeloid cells promote tumor progression by mediating angiogenesis, tumor cell intravasation, and metastasis, which can offset the effects of chemotherapy, radiation, and antiangiogenic therapy. Here, we show that the kinase switch control inhibitor rebastinib inhibits Tie2, a tyrosine kinase receptor expressed on endothelial cells and protumoral Tie2-expressing macrophages in mouse models of metastatic cancer. Rebastinib reduces tumor growth and metastasis in an orthotopic mouse model of metastatic mammary carcinoma through reduction of Tie2+ myeloid cell infiltration, antiangiogenic effects, and blockade of tumor cell intravasation mediated by perivascular Tie2Hi/Vegf-AHi macrophages in the tumor microenvironment of metastasis (TMEM). The antitumor effects of rebastinib enhance the efficacy of microtubule inhibiting chemotherapeutic agents, either eribulin or paclitaxel, by reducing tumor volume, metastasis, and improving overall survival. Rebastinib inhibition of angiopoietin/Tie2 signaling impairs multiple pathways in tumor progression mediated by protumoral Tie2+ macrophages, including TMEM-dependent dissemination and angiopoietin/Tie2-dependent angiogenesis. Rebastinib is a promising therapy for achieving Tie2 inhibition in cancer patients. Mol Cancer Ther; 16(11); 2486-501. ©2017 AACR.
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Affiliation(s)
- Allison S Harney
- Department of Anatomy & Structural Biology, Albert Einstein College of Medicine, New York, New York.,Department of Radiology, Albert Einstein College of Medicine, New York, New York.,Integrated Imaging Program, Albert Einstein College of Medicine, New York, New York.,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, New York, New York
| | - George S Karagiannis
- Department of Anatomy & Structural Biology, Albert Einstein College of Medicine, New York, New York.,Integrated Imaging Program, Albert Einstein College of Medicine, New York, New York.,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, New York, New York
| | - Jeanine Pignatelli
- Department of Anatomy & Structural Biology, Albert Einstein College of Medicine, New York, New York.,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, New York, New York
| | - Bryan D Smith
- Deciphera Pharmaceuticals, LLC, Waltham, Massachusetts
| | - Ece Kadioglu
- ISREC, School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Scott C Wise
- Deciphera Pharmaceuticals, LLC, Waltham, Massachusetts
| | - Molly M Hood
- Deciphera Pharmaceuticals, LLC, Waltham, Massachusetts
| | | | | | - Wei-Ping Lu
- Deciphera Pharmaceuticals, LLC, Waltham, Massachusetts
| | - Gada Al-Ani
- Deciphera Pharmaceuticals, LLC, Waltham, Massachusetts
| | - Xiaoming Chen
- Department of Anatomy & Structural Biology, Albert Einstein College of Medicine, New York, New York.,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, New York, New York
| | - David Entenberg
- Department of Anatomy & Structural Biology, Albert Einstein College of Medicine, New York, New York.,Integrated Imaging Program, Albert Einstein College of Medicine, New York, New York.,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, New York, New York
| | - Maja H Oktay
- Department of Anatomy & Structural Biology, Albert Einstein College of Medicine, New York, New York.,Integrated Imaging Program, Albert Einstein College of Medicine, New York, New York.,Department of Pathology Albert Einstein College of Medicine, New York, New York
| | - Yarong Wang
- Department of Anatomy & Structural Biology, Albert Einstein College of Medicine, New York, New York.,Integrated Imaging Program, Albert Einstein College of Medicine, New York, New York.,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, New York, New York
| | | | - Michele De Palma
- ISREC, School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Joan G Jones
- Department of Anatomy & Structural Biology, Albert Einstein College of Medicine, New York, New York.,Integrated Imaging Program, Albert Einstein College of Medicine, New York, New York.,Department of Pathology Albert Einstein College of Medicine, New York, New York.,Department of Epidemiology & Population Health, Albert Einstein College of Medicine, New York, New York
| | | | - John S Condeelis
- Department of Anatomy & Structural Biology, Albert Einstein College of Medicine, New York, New York. .,Integrated Imaging Program, Albert Einstein College of Medicine, New York, New York.,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, New York, New York
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Leary SES, Park JR, Reid JM, Ralya AT, Baruchel S, Wu B, Roberts TPL, Liu X, Minard CG, Fox E, Weigel B, Blaney S. Pediatric Phase I Trial and Pharmacokinetic Study of Trebananib in Relapsed Solid Tumors, Including Primary Tumors of the Central Nervous System ADVL1115: A Children's Oncology Group Phase I Consortium Report. Clin Cancer Res 2017; 23:6062-6069. [PMID: 28751444 DOI: 10.1158/1078-0432.ccr-16-2882] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 03/03/2017] [Accepted: 07/19/2017] [Indexed: 12/14/2022]
Abstract
Purpose: Trebananib is a first-in-class antiangiogenic peptibody (peptide-Fc fusion protein) that inhibits Angiopoietin 1 and 2. A pediatric phase 1 trial was performed to define trebananib dose-limiting toxicities (DLT), recommended phase 2 dose (RP2D), and pharmacokinetics (PK).Experimental Design: Trebananib was administered by weekly infusion. Three dose levels (10, 15, or 30 mg/kg/dose) were evaluated using a rolling-six design. Part 2 evaluated a cohort of subjects with primary central nervous system (CNS) tumors. Pharmacokinetic sampling and analysis of peripheral blood biomarkers was performed during the first 4 weeks. Response was evaluated after 8 weeks. Correlative studies included angiogenic protein expression and DCE-MRI.Results: Thirty-seven subjects were enrolled (31 evaluable for toxicity) with median age 12 years (range, 2 to 21). Two of 19 evaluable non-CNS subjects developed DLT at the 30 mg/kg dose level, including venous thrombosis and pleural effusion. In the CNS cohort, 3/12 subjects developed DLT, including decreased platelet count, transient ischemic attack, and cerebral edema with headache and hydrocephalus. Other grade 3 or 4 toxicities included lymphopenia (n = 4), anemia, thrombocytopenia, neutropenia, vomiting, and hypertension (n = 1 each). Response included stable disease in 7 subjects, no partial or complete responses. Two subjects continued study treatment with prolonged stable disease for 18 cycles (neuroblastoma) and 26 cycles (anaplastic astrocytoma). Pharmacokinetics appeared linear over 3 dose levels. Correlative studies demonstrated increased PlGF and sVCAM-1, but no change in endoglin or perfusion by DCE-MRI.Conclusions: Trebananib was well tolerated in pediatric patients with recurrent or refractory solid or CNS tumors. RP2D is 30 mg/kg. Clin Cancer Res; 23(20); 6062-9. ©2017 AACR.
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Affiliation(s)
- Sarah E S Leary
- Seattle Children's Hospital, University of Washington, Fred Hutchinson Cancer Research Center, Seattle, Washington.
| | - Julie R Park
- Seattle Children's Hospital, University of Washington, Fred Hutchinson Cancer Research Center, Seattle, Washington
| | | | | | | | - Bing Wu
- Hospital for Sick Children, Toronto, Ontario
| | | | - Xiaowei Liu
- Children's Oncology Group, Monrovia, California
| | - Charles G Minard
- Dan L. Duncan Institute for Clinical and Translational Research, Baylor College of Medicine, Houston, Texas
| | - Elizabeth Fox
- Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
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60
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Saharinen P, Eklund L, Alitalo K. Therapeutic targeting of the angiopoietin-TIE pathway. Nat Rev Drug Discov 2017; 16:635-661. [PMID: 28529319 DOI: 10.1038/nrd.2016.278] [Citation(s) in RCA: 332] [Impact Index Per Article: 47.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The endothelial angiopoietin (ANG)-TIE growth factor receptor pathway regulates vascular permeability and pathological vascular remodelling during inflammation, tumour angiogenesis and metastasis. Drugs that target the ANG-TIE pathway are in clinical development for oncological and ophthalmological applications. The aim is to complement current vascular endothelial growth factor (VEGF)-based anti-angiogenic therapies in cancer, wet age-related macular degeneration and macular oedema. The unique function of the ANG-TIE pathway in vascular stabilization also renders this pathway an attractive target in sepsis, organ transplantation, atherosclerosis and vascular complications of diabetes. This Review covers key aspects of the function of the ANG-TIE pathway in vascular disease and describes the recent development of novel therapeutics that target this pathway.
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Affiliation(s)
- Pipsa Saharinen
- Wihuri Research Institute and Translational Cancer Biology Program, Biomedicum Helsinki, University of Helsinki, Haartmaninkatu 8, P.O. Box 63, FI-00014 Helsinki, Finland
| | - Lauri Eklund
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, Aapistie 5A, University of Oulu, 90220 Oulu, Finland
| | - Kari Alitalo
- Wihuri Research Institute and Translational Cancer Biology Program, Biomedicum Helsinki, University of Helsinki, Haartmaninkatu 8, P.O. Box 63, FI-00014 Helsinki, Finland
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61
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Kim J, de Sampaio PC, Lundy DM, Peng Q, Evans KW, Sugimoto H, Gagea M, Kienast Y, Amaral NSD, Rocha RM, Eikesdal HP, Lønning PE, Meric-Bernstam F, LeBleu VS. Heterogeneous perivascular cell coverage affects breast cancer metastasis and response to chemotherapy. JCI Insight 2016; 1:e90733. [PMID: 28018977 PMCID: PMC5161212 DOI: 10.1172/jci.insight.90733] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Angiogenesis and co-optive vascular remodeling are prerequisites of solid tumor growth. Vascular heterogeneity, notably perivascular composition, may play a critical role in determining the rate of cancer progression. The contribution of vascular pericyte heterogeneity to cancer progression and therapy response is unknown. Here, we show that angiopoietin-2 (Ang2) orchestrates pericyte heterogeneity in breast cancer with an effect on metastatic disease and response to chemotherapy. Using multispectral imaging of human breast tumor specimens, we report that perivascular composition, as defined by the ratio of PDGFRβ- and desmin+ pericytes, provides information about the response to epirubicin but not paclitaxel. Using 17 distinct patient-derived breast cancer xenografts, we demonstrate a cancer cell-derived influence on stromal Ang2 production and a cancer cell-defined control over tumor vasculature and perivascular heterogeneity. The aggressive features of tumors and their distinct response to therapies may thus emerge by the cancer cell-defined engagement of distinct and heterogeneous angiogenic programs.
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Affiliation(s)
| | | | | | | | - Kurt W Evans
- Department of Investigational Cancer Therapeutics, and
| | | | - Mihai Gagea
- Department of Veterinary Medicine and Surgery, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Yvonne Kienast
- Discovery Oncology, Roche Pharmaceutical Research and Early Development, (pRED), Roche Innovation Center, Munich, Germany
| | | | - Rafael Malagoli Rocha
- Molecular Gynecology Laboratory, Gynecology Department, Federal University of São Paulo, Brazil
| | - Hans Petter Eikesdal
- Section of Oncology, Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Oncology, Haukeland University Hospital, Bergen, Norway
| | - Per Eystein Lønning
- Section of Oncology, Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Oncology, Haukeland University Hospital, Bergen, Norway
| | - Funda Meric-Bernstam
- Department of Investigational Cancer Therapeutics, and.,Department of Breast Surgical Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
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62
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Gilles ME, Maione F, Cossutta M, Carpentier G, Caruana L, Di Maria S, Houppe C, Destouches D, Shchors K, Prochasson C, Mongelard F, Lamba S, Bardelli A, Bouvet P, Couvelard A, Courty J, Giraudo E, Cascone I. Nucleolin Targeting Impairs the Progression of Pancreatic Cancer and Promotes the Normalization of Tumor Vasculature. Cancer Res 2016; 76:7181-7193. [PMID: 27754848 DOI: 10.1158/0008-5472.can-16-0300] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 10/05/2016] [Accepted: 10/12/2016] [Indexed: 11/16/2022]
Abstract
Pancreatic cancer is a highly aggressive tumor, mostly resistant to the standard treatments. Nucleolin is overexpressed in cancers and its inhibition impairs tumor growth. Herein, we showed that nucleolin was overexpressed in human specimens of pancreatic ductal adenocarcinoma (PDAC) and that the overall survival significantly increased in patients with low levels of nucleolin. The nucleolin antagonist N6L strongly impaired the growth of primary tumors and liver metastasis in an orthotopic mouse model of PDAC (mPDAC). Similar antitumor effect of N6L has been observed in a highly angiogenic mouse model of pancreatic neuroendocrine tumor RIP-Tag2. N6L significantly inhibited both human and mouse pancreatic cell proliferation and invasion. Notably, the analysis of tumor vasculature revealed a strong increase of pericyte coverage and vessel perfusion both in mPDAC and RIP-Tag2 tumors, in parallel to an inhibition of tumor hypoxia. Nucleolin inhibition directly affected endothelial cell (EC) activation and changed a proangiogenic signature. Among the vascular activators, nucleolin inhibition significantly decreased angiopoietin-2 (Ang-2) secretion and expression in ECs, in the tumor and in the plasma of mPDAC mice. As a consequence of the observed N6L-induced tumor vessel normalization, pre-treatment with N6L efficiently improved chemotherapeutic drug delivery and increased the antitumor properties of gemcitabine in PDAC mice. In conclusion, nucleolin inhibition is a new anti-pancreatic cancer therapeutic strategy that dually blocks tumor progression and normalizes tumor vasculature, improving the delivery and efficacy of chemotherapeutic drugs. Moreover, we unveiled Ang-2 as a potential target and suitable response biomarker for N6L treatment in pancreatic cancer. Cancer Res; 76(24); 7181-93. ©2016 AACR.
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Affiliation(s)
- Maud-Emmanuelle Gilles
- University of Paris Est (UPEC), ERL-CNRS 9215, Laboratory of Growth, Reparation and Tissue Regeneration (CRRET), UPEC, Créteil, France
| | - Federica Maione
- Laboratory of Transgenic Mouse Models, Candiolo Cancer Institute - FPO, IRCCS, Candiolo (TO), Italy
- Department of Science and Drug Technology, University of Torino, Torino, Italy
| | - Mélissande Cossutta
- University of Paris Est (UPEC), ERL-CNRS 9215, Laboratory of Growth, Reparation and Tissue Regeneration (CRRET), UPEC, Créteil, France
| | - Gilles Carpentier
- University of Paris Est (UPEC), ERL-CNRS 9215, Laboratory of Growth, Reparation and Tissue Regeneration (CRRET), UPEC, Créteil, France
| | - Laure Caruana
- University of Paris Est (UPEC), ERL-CNRS 9215, Laboratory of Growth, Reparation and Tissue Regeneration (CRRET), UPEC, Créteil, France
| | - Silvia Di Maria
- University of Paris Est (UPEC), ERL-CNRS 9215, Laboratory of Growth, Reparation and Tissue Regeneration (CRRET), UPEC, Créteil, France
| | - Claire Houppe
- University of Paris Est (UPEC), ERL-CNRS 9215, Laboratory of Growth, Reparation and Tissue Regeneration (CRRET), UPEC, Créteil, France
| | - Damien Destouches
- University of Paris Est (UPEC), ERL-CNRS 9215, Laboratory of Growth, Reparation and Tissue Regeneration (CRRET), UPEC, Créteil, France
| | - Ksenya Shchors
- Swiss Institute for Experimental Cancer Research (ISREC), EPFL SV ISREC, Station 19, Lausanne, Switzerland
| | - Christopher Prochasson
- Department of Pathology, Bichat Hospital APHP DHU UNITY and University of Paris Diderot, Paris, France
| | - Fabien Mongelard
- University of Lyon, Ecole normale Supérieure de Lyon, Cancer Research Center of Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS 5286, Centre Léon Bérard, Lyon, France
| | - Simona Lamba
- Department of Oncology, University of Torino, Candiolo (TO), Italy
| | - Alberto Bardelli
- Department of Oncology, University of Torino, Candiolo (TO), Italy
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (TO), Italy
| | - Philippe Bouvet
- University of Lyon, Ecole normale Supérieure de Lyon, Cancer Research Center of Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS 5286, Centre Léon Bérard, Lyon, France
| | - Anne Couvelard
- Department of Pathology, Bichat Hospital APHP DHU UNITY and University of Paris Diderot, Paris, France
| | - José Courty
- University of Paris Est (UPEC), ERL-CNRS 9215, Laboratory of Growth, Reparation and Tissue Regeneration (CRRET), UPEC, Créteil, France
| | - Enrico Giraudo
- Laboratory of Transgenic Mouse Models, Candiolo Cancer Institute - FPO, IRCCS, Candiolo (TO), Italy.
- Department of Science and Drug Technology, University of Torino, Torino, Italy
| | - Ilaria Cascone
- University of Paris Est (UPEC), ERL-CNRS 9215, Laboratory of Growth, Reparation and Tissue Regeneration (CRRET), UPEC, Créteil, France.
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63
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Han HH, Kim BG, Lee JH, Kang S, Kim JE, Cho NH. Angiopoietin-2 promotes ER+ breast cancer cell survival in bone marrow niche. Endocr Relat Cancer 2016; 23:609-23. [PMID: 27353038 PMCID: PMC5064757 DOI: 10.1530/erc-16-0086] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 06/27/2016] [Indexed: 12/11/2022]
Abstract
In estrogen receptor-positive (ER+) breast cancer, it is recognized that metastases may develop after a long period of dormancy. Bone marrow (BM) vascular niche is where the dormant tumor cells are most likely to reside. So far, it is not fully understood why the dormant tumor cells become proliferative and eventually generate tumor. We hypothesized that therapeutic or menopause-related estrogen depletion may be the switch behind dormant ER+ tumor cell awakening in BM. We utilized an existing experimental model of BM endothelial niche that can simulate ER+ tumor cell dormancy to test our hypothesis. In results, estrogen depletion paradoxically promoted ER+ tumor cell proliferation in the BM endothelial niche, and their molecular phenotype shifted from dormant to awaken. Following estrogen depletion, the BM niche cells produced angiopoietin-2 (ANGPT2), which destabilized niche endothelium by interfering ANGPT1/Tie2 signaling, and promoted ER+ tumor cell survival under estrogen deficiency via cell surface integrin &1. Knockdown of ANGPT2 completely negated ER+ tumor cell awakening in the niche. Furthermore, ANGPT2 expression in ER+ tumor human samples was associated with increased risk of distant metastasis only in those who underwent adjuvant estrogen depletion therapy, not in those who did not undergo adjuvant therapy. In conclusion, we demonstrate that ANGPT2 signaling activated after estrogen depletion paradoxically triggers ER+ tumor cell awakening from dormancy in their BM niche, partly indirectly via endothelial Tie2 receptor and partly directly via tumor cell surface integrin &1.
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Affiliation(s)
- Hyun Ho Han
- Brain Korea 21 Plus Project for Medical ScienceYonsei University College of Medicine, Seoul, South Korea Department of PathologyYonsei University College of Medicine, Seoul, South Korea
| | - Baek Gil Kim
- Department of PathologyYonsei University College of Medicine, Seoul, South Korea
| | - Joo Hyun Lee
- Brain Korea 21 Plus Project for Medical ScienceYonsei University College of Medicine, Seoul, South Korea
| | - Suki Kang
- Department of PathologyYonsei University College of Medicine, Seoul, South Korea
| | - Ji Eun Kim
- Brain Korea 21 Plus Project for Medical ScienceYonsei University College of Medicine, Seoul, South Korea
| | - Nam Hoon Cho
- Brain Korea 21 Plus Project for Medical ScienceYonsei University College of Medicine, Seoul, South Korea Department of PathologyYonsei University College of Medicine, Seoul, South Korea Severance Biomedical Science Institute (SBSI)Yonsei University College of Medicine, Seoul, South Korea Global 5-5-10 System BiologyYonsei University, Seoul, South Korea
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64
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Hassan BB, Elshafae SM, Supsavhad W, Simmons JK, Dirksen WP, Sokkar SM, Rosol TJ. Feline Mammary Cancer. Vet Pathol 2016; 54:32-43. [PMID: 27281014 DOI: 10.1177/0300985816650243] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Feline mammary carcinoma (FMC) is similar to human breast cancer in the late age of onset, incidence, histopathologic features, biological behavior, and pattern of metastasis. Therefore, FMC has been proposed as a relevant model for aggressive human breast cancer. The goals of this study were to develop a nude mouse model of FMC tumor growth and metastasis and to measure the expression of genes responsible for lymphangiogenesis, angiogenesis, tumor progression, and lymph node metastasis in FMC tissues and cell lines. Two primary FMC tissues were injected subcutaneously, and 6 FMC cell lines were injected into 3 sites (subcutaneous, intratibial, and intracardiac) in nude mice. Tumors and metastases were monitored using bioluminescent imaging and characterized by gross necropsy, radiology, and histopathology. Molecular characterization of invasion and metastasis genes in FMC was conducted using quantitative real-time reverse transcription polymerase chain reaction in 6 primary FMC tissues, 2 subcutaneous FMC xenografts, and 6 FMC cell lines. The histologic appearance of the subcutaneous xenografts resembled the primary tumors. No metastasis was evident following subcutaneous injection of tumor tissues and cell lines, whereas lung, brain, liver, kidney, eye, and bone metastases were confirmed following intratibial and intracardiac injection of FMC cell lines. Finally, 15 genes were differentially expressed in the FMC tissues and cell lines. The highly expressed genes in all samples were PDGFA, PDGFB, PDGFC, FGF2, EGFR, ERBB2, ERBB3, VEGFD, VEGFR3, and MYOF. Three genes ( PDGFD, ANGPT2, and VEGFC) were confirmed to be of stromal origin. This investigation demonstrated the usefulness of nude mouse models of experimental FMC and identified molecular targets of FMC progression and metastasis.
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Affiliation(s)
- B B Hassan
- 1 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA.,2 Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - S M Elshafae
- 1 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA.,3 Department of Pathology, Faculty of Veterinary Medicine, Benha University, Kalyubia, Egypt
| | - W Supsavhad
- 1 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - J K Simmons
- 1 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - W P Dirksen
- 1 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - S M Sokkar
- 2 Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - T J Rosol
- 1 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
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65
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Jung M, Ören B, Mora J, Mertens C, Dziumbla S, Popp R, Weigert A, Grossmann N, Fleming I, Brüne B. Lipocalin 2 from macrophages stimulated by tumor cell-derived sphingosine 1-phosphate promotes lymphangiogenesis and tumor metastasis. Sci Signal 2016; 9:ra64. [PMID: 27353364 DOI: 10.1126/scisignal.aaf3241] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Tumor cell-derived factors skew macrophages toward a tumor-supporting phenotype associated with the secretion of protumorigenic mediators. Apoptosing tumor cells release sphingosine 1-phosphate (S1P), which stimulates the production of lipocalin 2 (LCN2) in tumor-associated macrophages and is associated with tumor metastasis. We explored the mechanism by which S1P induces LCN2 in macrophages and investigated how this contributed to tumor growth and metastasis. Knockdown of S1P receptor 1 (S1PR1) in primary human macrophages and experiments with bone marrow-derived macrophages from S1PR1-deficient mice showed that S1P signaled through S1PR1 to induce LCN2 expression. The LCN2 promoter contains a consensus sequence for signal transducer and activator of transcription 3 (STAT3), and deletion of the STAT3 recognition sequence reduced expression of an LCN2-controlled reporter gene. Conditioned medium from coculture experiments indicated that the release of LCN2 from macrophages induced tube formation and proliferation in cultures of primary human lymphatic endothelial cells in a manner dependent on the kinase PI3K and subsequent induction of the growth factor VEGFC, which functioned as an autocrine signal stimulating the receptor VEGFR3. Knockout of Lcn2 attenuated tumor-associated lymphangiogenesis and breast tumor metastasis both in the breast cancer model MMTV-PyMT mice and in mice bearing orthotopic wild-type tumors. Our findings indicate that macrophages respond to dying tumor cells by producing signals that promote lymphangiogenesis, which enables metastasis.
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Affiliation(s)
- Michaela Jung
- Institute of Biochemistry I, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Bilge Ören
- Institute of Biochemistry I, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Javier Mora
- Institute of Biochemistry I, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany. Faculty of Microbiology, University of Costa Rica, 2060 San José, Costa Rica
| | - Christina Mertens
- Institute of Biochemistry I, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Sarah Dziumbla
- Institute for Vascular Signalling, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Rüdiger Popp
- Institute for Vascular Signalling, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Andreas Weigert
- Institute of Biochemistry I, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Nina Grossmann
- Institute of Biochemistry I, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Ingrid Fleming
- Institute for Vascular Signalling, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Bernhard Brüne
- Institute of Biochemistry I, Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.
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66
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Chen Z, Zhu S, Hong J, Soutto M, Peng D, Belkhiri A, Xu Z, El-Rifai W. Gastric tumour-derived ANGPT2 regulation by DARPP-32 promotes angiogenesis. Gut 2016; 65:925-34. [PMID: 25779598 PMCID: PMC4573388 DOI: 10.1136/gutjnl-2014-308416] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Accepted: 02/27/2015] [Indexed: 12/16/2022]
Abstract
OBJECTIVE Overexpression of dopamine and cAMP-regulated phosphoprotein, Mr 32000 (DARPP-32), and its truncated isoform (t-DARPP) are associated with gastric tumorigenesis. Herein, we investigated the role of DARPP-32 proteins in regulating angiopoietin 2 (ANGPT2) and promoting tumour angiogenesis. DESIGN Quantitative real-time RT-PCR, immunoblotting, luciferase reporter, immunofluorescence, immunohistochemistry and angiogenesis assays were applied to investigate the regulation of angiogenesis by DARPP-32 proteins. RESULTS Overexpression of DARPP-32 significantly increased the mRNA and protein levels of ANGPT2 in gastric cancer cells. The overexpression of DARPP-32 T34A mutant or the N-terminal truncated isoform, t-DARPP, led to similar effects ruling out the T34-dependent regulation of protein phosphatase 1 activity in regulating ANGPT2. DARPP-32 proteins induced a secreted form of ANGPT2, which was detectable in the media, functionally active, and able to induce angiogenesis, measured by the human umbilical vein endothelial cells tube formation assay. Antibody blocking of the secreted ANGPT2 abrogated its function. To identify the mechanism by which DARPP-32 regulates ANGPT2, we examined the activities of NF-κB and signal transducer and activator of transcription 3 (STAT3), known regulators of angiogenesis. The results ruled out NF-κB and showed induction of STAT3 phosphorylation, activation and nuclear localisation. Inhibition or knockdown of STAT3 significantly attenuated the induction of ANGPT2 by DARPP-32 proteins. In vivo xenograft models demonstrated that overexpression of DARPP-32 promotes angiogenesis and tumour growth. Analyses of human gastric cancer tissues showed a strong correlation between DARPP-32 and ANGPT2. CONCLUSIONS Our novel findings establish the role of DARPP-32-STAT3 axis in regulating ANGPT2 in cancer cells to promote angiogenesis and tumorigenesis.
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Affiliation(s)
- Zheng Chen
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Shoumin Zhu
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Jun Hong
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Mohammed Soutto
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
| | - DunFa Peng
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Abbes Belkhiri
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Zekuan Xu
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Wael El-Rifai
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
- Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, Tennessee
- Department of Veterans Affairs, Tennessee Valley Healthcare System, Nashville, Tennessee
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67
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Rautiola J, Lampinen A, Mirtti T, Ristimäki A, Joensuu H, Bono P, Saharinen P. Association of Angiopoietin-2 and Ki-67 Expression with Vascular Density and Sunitinib Response in Metastatic Renal Cell Carcinoma. PLoS One 2016; 11:e0153745. [PMID: 27100185 PMCID: PMC4839598 DOI: 10.1371/journal.pone.0153745] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Accepted: 04/04/2016] [Indexed: 12/12/2022] Open
Abstract
The Angiopoietin-2 (Ang2, Angpt2) growth factor is a context-dependent antagonist/agonist ligand of the endothelial Tie2 receptor tyrosine kinase and known to promote tumour angiogenesis and metastasis. Angiopoietin antagonists have been tested in clinical cancer trials in combination with VEGF-based anti-angiogenic therapy, including sunitinib, which is widely used as a first-line therapy for metastatic renal cell carcinoma (mRCC). However, little is known about Ang2 protein expression in human tumours and the correlation of tumour Ang2 expression with tumour vascularization, tumour cell proliferation and response to anti-angiogenic therapies. Here, we evaluated, using immunohistochemistry, the expression of Ang2, CD31 and the cell proliferation marker Ki-67 in the primary kidney cancer from 136 mRCC patients, who received first-line sunitinib after nephrectomy. Ang2 protein expression was restrained to RCC tumour vessels, and correlated with tumour vascularization and response to sunitinib. High pre-therapeutic Ang2 expression, and more strongly, combined high expression of both Ang2 and CD31, were associated with a high clinical benefit rate (CBR). Low cancer Ki-67 expression, but not Ang2 or CD31 expression, was associated with favourable progression-free (PFS) and overall survival (OS) as compared to patients with high Ki-67 expression (PFS 6.5 vs. 10.6 months, P = 0.009; OS, 15.7 vs. 28.5 months, P = 0.015). In summary, in this study to investigate endothelial Ang2 in mRCC patients treated with first-line sunitinib, high cancer Ang2 expression was associated with the CBR, but not PFS or OS, whereas low Ki-67 expression was significantly associated with long PFS and OS.
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Affiliation(s)
- Juhana Rautiola
- Comprehensive Cancer Center, Helsinki University Hospital, P.O.B. 180, 00029 HUS, Finland and University of Helsinki, Finland
| | - Anita Lampinen
- Translational Cancer Biology Program, Research Programs Unit, and Department of Virology, Haartman Institute, Biomedicum Helsinki, Haartmaninkatu 8, P.O.B. 63, FI-00014, University of Helsinki, Finland
| | - Tuomas Mirtti
- Institute for Molecular Medicine Finland, Haartmaninkatu 8, P.O.B. 63, FI-00014, University of Helsinki, Finland.,Pathology, Research Programs Unit and HUSLAB, University of Helsinki and Helsinki University Hospital, P.O.B. 400, FI-00029, HUS, Helsinki, Finland
| | - Ari Ristimäki
- Pathology, Research Programs Unit and HUSLAB, University of Helsinki and Helsinki University Hospital, P.O.B. 400, FI-00029, HUS, Helsinki, Finland
| | - Heikki Joensuu
- Comprehensive Cancer Center, Helsinki University Hospital, P.O.B. 180, 00029 HUS, Finland and University of Helsinki, Finland
| | - Petri Bono
- Comprehensive Cancer Center, Helsinki University Hospital, P.O.B. 180, 00029 HUS, Finland and University of Helsinki, Finland
| | - Pipsa Saharinen
- Translational Cancer Biology Program, Research Programs Unit, and Department of Virology, Haartman Institute, Biomedicum Helsinki, Haartmaninkatu 8, P.O.B. 63, FI-00014, University of Helsinki, Finland.,Wihuri Research Institute, Biomedicum Helsinki, Haartmaninkatu 8, FI-00290, Helsinki, Finland
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68
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Evaluation of Angiopoietin-2 as a biomarker in gastric cancer: results from the randomised phase III AVAGAST trial. Br J Cancer 2016; 114:855-62. [PMID: 27031850 PMCID: PMC4984795 DOI: 10.1038/bjc.2016.30] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 12/29/2015] [Accepted: 01/20/2016] [Indexed: 01/01/2023] Open
Abstract
Background: In the phase III AVAGAST trial, the addition of bevacizumab to chemotherapy improved progression-free survival (PFS) but not overall survival (OS) in patients with advanced gastric cancer. We studied the role of Angiopoietin-2 (Ang-2), a key driver of tumour angiogenesis, metastasis and resistance to antiangiogenic treatment, as a biomarker. Methods: Previously untreated, advanced gastric cancer patients were randomly assigned to receive bevacizumab (n=387) or placebo (n=387) in combination with chemotherapy. Plasma collected at baseline and at progression was analysed by ELISA. The role of Ang-2 as a prognostic and a predictive biomarker of bevacizumab efficacy was studied using a Cox proportional hazards model. Logistic regression analysis was applied for correlations with metastasis. Results: Median baseline plasma Ang-2 levels were lower in Asian (2143 pg ml−1) vs non-Asian patients (3193 pg ml−1), P<0.0001. Baseline plasma Ang-2 was identified as an independent prognostic marker for OS but did not predict bevacizumab efficacy alone or in combination with baseline VEGF. Baseline plasma Ang-2 correlated with the frequency of liver metastasis (LM) at any time: Odds ratio per 1000 pg ml−1 increase: 1.19; 95% CI 1.10–1.29; P<0.0001 (non-Asians) and 1.37; 95% CI 1.13–1.64; P=0.0010 (Asians). Conclusions: Baseline plasma Ang-2 is a novel prognostic biomarker for OS in advanced gastric cancer strongly associated with LM. Differences in Ang-2 mediated vascular response may, in part, account for outcome differences between Asian and non-Asian patients; however, data have to be further validated. Ang-2 is a promising drug target in gastric cancer.
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69
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A phase I trial of ANG1/2-Tie2 inhibitor trebaninib (AMG386) and temsirolimus in advanced solid tumors (PJC008/NCI♯9041). Invest New Drugs 2015; 34:104-11. [PMID: 26686201 PMCID: PMC4718956 DOI: 10.1007/s10637-015-0313-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 12/03/2015] [Indexed: 11/22/2022]
Abstract
Background There is crosstalk between the ANG-Tie2 and the PI3K/Akt/mTOR pathways. Combined ANG1/2 and mTOR blockade may have additive anti-cancer activity. The combination of trebananib, an inhibitor of ANG1/2-Tie2 interaction, with temsirolimus was evaluated in patients with advanced solid tumors to determine tolerability, maximum tolerated dose (MTD), and preliminary antitumor activity. Methods Patients were enrolled using 3 + 3 design, and were given intravenous trebananib and temsirolimus on Day 1, 8, 15 and 22 of a 28-day cycle. Dose limiting toxicities (DLTs) were evaluated during cycle 1. Peripheral blood was collected for evaluation of Tie2-expressing monocytes (TEMs) and thymidine phosphorylase (TP). Sparse pharmacokinetic (PK) sampling for trebananib drug levels was performed on Day 1 and 8 of cycle 2. Results Twenty-one patients were enrolled, 6 at dose level (DL) 1, 7 at DL −1, and 8 at DL −2. No effect of temsirolimus on trebananib PK was observed. The most common treatment-related adverse events (AEs) were: fatigue (81 %), edema (62 %), anorexia (57 %), nausea (52 %), rash (43 %) and mucositis (43 %). The most common grade ≥ 3 AEs included lymphopenia (28 %) and fatigue (28 %). The MTD was exceeded at DL-2. Of 18 response evaluable patients, 1 partial response was observed (ER+/HER2−/PIK3CA mutant breast cancer) and 4 patients had prolonged SD ≥ 24 weeks. No correlation with clinical benefit was observed with change in number TEMs or TP expression in TEMs with treatment. Conclusions The MTD was exceeded at trebananib 10 mg/kg weekly and temsirolimus 20 mg weekly, with frequent overlapping toxicities including fatigue, edema, and anorexia.
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70
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Gopinathan G, Milagre C, Pearce OMT, Reynolds LE, Hodivala-Dilke K, Leinster DA, Zhong H, Hollingsworth RE, Thompson R, Whiteford JR, Balkwill F. Interleukin-6 Stimulates Defective Angiogenesis. Cancer Res 2015; 75:3098-107. [PMID: 26081809 PMCID: PMC4527186 DOI: 10.1158/0008-5472.can-15-1227] [Citation(s) in RCA: 175] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 05/13/2015] [Indexed: 12/19/2022]
Abstract
The cytokine IL6 has a number of tumor-promoting activities in human and experimental cancers, but its potential as an angiogenic agent has not been fully investigated. Here, we show that IL6 can directly induce vessel sprouting in the ex vivo aortic ring model, as well as endothelial cell proliferation and migration, with similar potency to VEGF. However, IL6-stimulated aortic ring vessel sprouts had defective pericyte coverage compared with VEGF-stimulated vessels. The mechanism of IL6 action on pericytes involved stimulation of the Notch ligand Jagged1 as well as angiopoietin2 (Ang2). When peritoneal xenografts of ovarian cancer were treated with an anti-IL6 antibody, pericyte coverage of vessels was restored. In addition, in human ovarian cancer biopsies, there was an association between levels of IL6 mRNA, Jagged1, and Ang2. Our findings have implications for the use of cancer therapies that target VEGF or IL6 and for understanding abnormal angiogenesis in cancers, chronic inflammatory disease, and stroke.
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Affiliation(s)
- Ganga Gopinathan
- Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom
| | - Carla Milagre
- Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom
| | - Oliver M T Pearce
- Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom
| | - Louise E Reynolds
- Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom
| | - Kairbaan Hodivala-Dilke
- Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom
| | - David A Leinster
- Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom
| | - Haihong Zhong
- MedImmune, One MedImmune Way, Gaithersburg, Maryland
| | | | - Richard Thompson
- Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom
| | - James R Whiteford
- William Harvey Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom
| | - Frances Balkwill
- Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom.
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Blecharz KG, Colla R, Rohde V, Vajkoczy P. Control of the blood-brain barrier function in cancer cell metastasis. Biol Cell 2015; 107:342-71. [PMID: 26032862 DOI: 10.1111/boc.201500011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 05/22/2015] [Indexed: 12/25/2022]
Abstract
Cerebral metastases are the most common brain neoplasms seen clinically in the adults and comprise more than half of all brain tumours. Actual treatment options for brain metastases that include surgical resection, radiotherapy and chemotherapy are rarely curative, although palliative treatment improves survival and life quality of patients carrying brain-metastatic tumours. Chemotherapy in particular has also shown limited or no activity in brain metastasis of most tumour types. Many chemotherapeutic agents used systemically do not cross the blood-brain barrier (BBB), whereas others may transiently weaken the BBB and allow extravasation of tumour cells from the circulation into the brain parenchyma. Increasing evidence points out that the interaction between the BBB and tumour cells plays a key role for implantation and growth of brain metastases in the central nervous system. The BBB, as the tightest endothelial barrier, prevents both early detection and treatment by creating a privileged microenvironment. Therefore, as observed in several in vivo studies, precise targetting the BBB by a specific transient opening of the structure making it permeable for therapeutic compounds, might potentially help to overcome this difficult clinical problem. Moreover, a better understanding of the molecular features of the BBB, its interrelation with metastatic tumour cells and the elucidation of cellular mechanisms responsible for establishing cerebral metastasis must be clearly outlined in order to promote treatment modalities that particularly involve chemotherapy. This in turn would substantially expand the survival and quality of life of patients with brain metastasis, and potentially increase the remission rate. Therefore, the focus of this review is to summarise the current knowledge on the role and function of the BBB in cancer metastasis.
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Affiliation(s)
- Kinga G Blecharz
- Department of Experimental Neurosurgery, Charité-Universitätsmedizin Berlin, Berlin, 10119, Germany
| | - Ruben Colla
- Department of Neurosurgery, Göttingen University Medical Center, Göttingen, 37070, Germany
| | - Veit Rohde
- Department of Neurosurgery, Göttingen University Medical Center, Göttingen, 37070, Germany
| | - Peter Vajkoczy
- Department of Experimental Neurosurgery, Charité-Universitätsmedizin Berlin, Berlin, 10119, Germany.,Department of Neurosurgery, Charité-Universitätsmedizin Berlin, Berlin, 13353, Germany
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72
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Yoshinaga T, Shigemitsu T, Nishimata H, Takei T, Yoshida M. Angiopoietin-like protein 2 is a potential biomarker for gastric cancer. Mol Med Rep 2014; 11:2653-8. [PMID: 25484242 DOI: 10.3892/mmr.2014.3040] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 09/18/2014] [Indexed: 12/14/2022] Open
Abstract
Globally, gastric cancer is one of the most common types of cancer and is the second leading cause of cancer‑induced mortality. Early detection of gastric cancer is able to contribute to a reduction of its mortality. For early detection, more specific and sensitive biomarkers than the classic biomarkers, including carcinoembryonic antigen, carbohydrate antigen 19‑9 and C‑reactive protein, are required. The present study focused on the evaluation of the potential of angiopoietin‑like protein 2 (ANGPTL2) as a novel biomarker for gastric cancer. The expression levels of ANGPTL2 in undifferentiated and differentiated gastric cancer cell lines (HGC‑27 and MKN7, respectively) were therefore investigated. Additionally, ANGPTL2 levels in the serum of gastric cancer patients were compared with those of healthy individuals to evaluate the possibility of the protein as a predictive biomarker for gastric cancer. It was established that the expression levels of ANGPTL2 mRNA and protein were higher in undifferentiated HGC‑27 cells than those in differentiated MKN7 cells. In a patient study, it was indicated that the levels of ANGPTL2 in the serum of gastric cancer patients were higher than those in healthy controls. The diagnostic performance of ANGPTL2 was assessed by constructing a receiver operating characteristic (ROC) curve and was evaluated by calculating the area under each ROC curve (AUC). For the discrimination of patients with gastric cancer from healthy individuals, the AUC for ANGPTL2 was 0.774 (P=0.005) (95% confidence interval, 0.615‑0.933). These results suggested that ANGPTL2 was a potential biomarker for gastric cancer.
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Affiliation(s)
- Takuma Yoshinaga
- Department of Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890‑0065, Japan
| | - Takamasa Shigemitsu
- Department of Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890‑0065, Japan
| | - Hiroto Nishimata
- Department of Gastroenterology, Nanpuh Hospital, Kagoshima 892-0854, Japan
| | - Takayuki Takei
- Department of Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890‑0065, Japan
| | - Masahiro Yoshida
- Department of Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890‑0065, Japan
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Lee HS, Oh SJ, Lee KH, Lee YS, Ko E, Kim KE, Kim HC, Kim S, Song PH, Kim YI, Kim C, Han S. Gln-362 of angiopoietin-2 mediates migration of tumor and endothelial cells through association with α5β1 integrin. J Biol Chem 2014; 289:31330-40. [PMID: 25237190 DOI: 10.1074/jbc.m114.572594] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Angiopoietin-2 (Ang-2) not only regulates angiogenesis by binding to its well known receptor Tie2 on endothelial cells but also controls sprouting of Tie2-negative angiogenic endothelial cells and invasion of Tie2-negative non-endothelial cells by binding to integrins. However, the molecular mechanism of the Ang-2/integrin association has been unclear. In this study, we found that the Gln-362 residue of Ang-2 was essential for binding to α5β1 integrin. A Q362E Ang-2 mutant, which still bound to Tie2, failed to associate with α5β1 integrin and was unable to activate the integrin downstream signaling of focal adhesion kinase. In addition, unlike wild-type Ang-2, the Q362E Ang-2 mutant was defective in mediating invasion of Tie2-negative glioma or Tie2-positive endothelial cells. Furthermore, the tailpiece domain of the α5 subunit in α5β1 integrin was critical for binding to Ang-2. Taken together, these results provide a novel insight into the mechanism of integrin regulation by Ang-2, which contributes to tumor invasion and endothelial cell migration in a Tie2-independent manner.
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Affiliation(s)
- Hyo Seon Lee
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Seung Ja Oh
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Kwang-Hoon Lee
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Yoon-Sook Lee
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Eun Ko
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Kyung Eun Kim
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Hyung-chan Kim
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Seokkyun Kim
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Paul H Song
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Yong-In Kim
- the Well Aging Center, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., Suwon-Si 443-803, South Korea, and
| | - Chungho Kim
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea, the School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, South Korea
| | - Sangyeul Han
- From the Bio Therapeutics Lab, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea,
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ZHANG ZHONGLIN, ZHANG JIFA, YUAN YUFENG, HE YUEMING, LIU QUANYAN, MAO XIAOWEN, AI YONGBIAO, LIU ZHISU. Suppression of angiogenesis and tumor growth in vitro and in vivo using an anti-angiopoietin-2 single-chain antibody. Exp Ther Med 2014; 7:543-552. [PMID: 24520243 PMCID: PMC3919851 DOI: 10.3892/etm.2014.1476] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Accepted: 12/11/2013] [Indexed: 12/15/2022] Open
Abstract
Hepatocellular carcinomas (HCCs) are tumors with a highly developed vascular architecture. HCC cells require access to blood vessels for growth and metastasis; therefore, the inhibition of angiogenesis represents a potential therapeutic target for HCC that may reduce the mortality and morbidity from HCC. Various attempts to develop an anti-angiogenic therapy have been made in past decades; however, modest results have been achieved in clinical trials and the challenge of HCC treatment remains. Single-chain antibodies (scFv) are characterized by low molecular weight, low immunogenicity, high penetration and a short half-life, and are easy to produce on a large scale by genetic engineering. Accordingly, an scFv against a specific angiogenic regulator, such as angiopoietin (Ang), may be a promising anti-angiogenic therapy for HCC. Our previous study indicated that an imbalanced expression of angiopoietin-2 (Ang-2) vs. angiopoietin-1 (Ang-1) in HCCs contributes to initiation of neovascularization and promotes the angiogenesis and progression of HCCs. Therefore, we suggest that specific Ang-2-targeting interventions may be valuable in the treatment of HCC via remodeling the neovascular network and changing the tumor microenvironment. In this study, a prokaryotic expression vector of Ang-2 was constructed and purified human Ang-2 protein was isolated. An scFv against human Ang-2 (scFv-Ang2) was identified and purified via phage display technology, and the effects of scFv-Ang2 in vitro and in vivo on HCC in nude mice were evaluated. The results show that scFv-Ang2 inhibits vascular endothelial growth factor (VEGF) and Ang-2 induces the proliferation, migration and tubule formation of human umbilical vein endothelial cells (HUVECs) in vitro. In the in vivo assay, statistical indices, including tumor weight and volume, metastases to lungs, CD31 expression and the microvessel density (MVD) count in the scFv-Ang2-treated group of mice were significantly lower than those in the control group (P<0.05). In conclusion, the successfully generated scFv-Ang2 showed significant inhibitory effects on the angiogenesis and tumor growth of human HCC in vitro and in vivo.
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Affiliation(s)
- ZHONG-LIN ZHANG
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - JI-FA ZHANG
- Department of General Surgery, Branch Hospital in Fengxian of Shanghai No. 6 People’s Hospital, Shanghai 201406, P.R. China
| | - YU-FENG YUAN
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - YUE-MING HE
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - QUAN-YAN LIU
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - XIAO-WEN MAO
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - YONG-BIAO AI
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - ZHI-SU LIU
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
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75
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Lorbeer R, Baumeister SE, Dörr M, Nauck M, Grotevendt A, Völzke H, Vasan RS, Wallaschofski H, Lieb W. Circulating angiopoietin-2, its soluble receptor Tie-2, and mortality in the general population. Eur J Heart Fail 2014; 15:1327-34. [DOI: 10.1093/eurjhf/hft117] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Affiliation(s)
- Roberto Lorbeer
- Institute for Community Medicine; Ernst Moritz Arndt University Greifswald; Germany
| | | | - Marcus Dörr
- Department of Internal Medicine; Ernst Moritz Arndt University Greifswald; Germany
- DZHK (German Centre for Cardiovascular Research); Greifswald Germany
| | - Matthias Nauck
- DZHK (German Centre for Cardiovascular Research); Greifswald Germany
| | - Anne Grotevendt
- Institute of Clinical Chemistry and Laboratory Medicine; Ernst Moritz Arndt University Greifswald; Germany
| | - Henry Völzke
- Institute for Community Medicine; Ernst Moritz Arndt University Greifswald; Germany
- DZHK (German Centre for Cardiovascular Research); Greifswald Germany
| | - Ramachandran S. Vasan
- Preventive Medicine & Epidemiology Section; Boston University School of Medicine and Framingham Heart Study; Framingham MA USA
| | - Henri Wallaschofski
- DZHK (German Centre for Cardiovascular Research); Greifswald Germany
- Institute of Clinical Chemistry and Laboratory Medicine; Ernst Moritz Arndt University Greifswald; Germany
| | - Wolfgang Lieb
- Institute for Community Medicine; Ernst Moritz Arndt University Greifswald; Germany
- Institute of Epidemiology; Christian Albrechts University; Kiel Germany
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76
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Affiliation(s)
- Houda Haouas
- Department of Biological and Chemical EngineeringNational Institute of Applied Sciences and Technology, Tunis, Tunisia
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77
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Hong DS, Gordon MS, Samlowski WE, Kurzrock R, Tannir N, Friedland D, Mendelson DS, Vogelzang NJ, Rasmussen E, Wu BM, Bass MB, Zhong ZD, Friberg G, Appleman LJ. A phase I, open-label study of trebananib combined with sorafenib or sunitinib in patients with advanced renal cell carcinoma. Clin Genitourin Cancer 2013; 12:167-177.e2. [PMID: 24365125 DOI: 10.1016/j.clgc.2013.11.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 10/08/2013] [Accepted: 11/08/2013] [Indexed: 11/25/2022]
Abstract
BACKGROUND Trebananib, an investigational peptibody, binds to angiopoietin 1 and 2, thereby blocking their interaction with Tie2. PATIENTS AND METHODS This open-label phase I study examined trebananib 3 mg/kg or 10 mg/kg intravenous (I.V.) once weekly plus sorafenib 400 mg twice per day or sunitinib 50 mg once per day in advanced RCC. Primary end points were adverse event incidence and pharmacokinetics. RESULTS Thirty-seven patients were enrolled. During trebananib plus sorafenib administration (n = 17), the most common treatment-related adverse events (TRAEs) included rash (n = 12; 71%), diarrhea (n = 12; 71%), hypertension (n = 11; 65%), and fatigue (n = 11; 65%); grade ≥ 3 TRAEs (n = 7; 41%); and 2 patients (12%) had peripheral edema. During trebananib plus sunitinib administration (n = 19), the most common TRAEs included diarrhea (n = 14; 74%), fatigue (n = 13; 68%), hypertension (n = 11; 58%), and decreased appetite (n = 11; 58%); grade ≥ 3 TRAEs (n = 13; 68%); and 8 (42%) patients had peripheral edema. Trebananib did not appear to alter the pharmacokinetics of sorafenib or sunitinib. No patient developed anti-trebananib antibodies. Objective response rates were 29% (trebananib plus sorafenib) and 53% (trebananib plus sunitinib). CONCLUSION The toxicities of trebananib 3 mg/kg or 10 mg/kg I.V. plus sorafenib or sunitinib in RCC were similar to those of sorafenib or sunitinib monotherapy, with peripheral edema being likely specific to the combinations. Antitumor activity was observed.
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Affiliation(s)
- David S Hong
- Division of Cancer Medicine, Department of Investigational Cancer Therapeutics, University of Texas M.D. Anderson Cancer Center, Houston, TX.
| | | | | | - Razelle Kurzrock
- Division of Cancer Medicine, Department of Investigational Cancer Therapeutics, University of Texas M.D. Anderson Cancer Center, Houston, TX
| | - Nizar Tannir
- Division of Cancer Medicine, Department of Investigational Cancer Therapeutics, University of Texas M.D. Anderson Cancer Center, Houston, TX
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78
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Kienast Y, Klein C, Scheuer W, Raemsch R, Lorenzon E, Bernicke D, Herting F, Yu S, The HH, Martarello L, Gassner C, Stubenrauch KG, Munro K, Augustin HG, Thomas M. Ang-2-VEGF-A CrossMab, a Novel Bispecific Human IgG1 Antibody Blocking VEGF-A and Ang-2 Functions Simultaneously, Mediates Potent Antitumor, Antiangiogenic, and Antimetastatic Efficacy. Clin Cancer Res 2013; 19:6730-40. [DOI: 10.1158/1078-0432.ccr-13-0081] [Citation(s) in RCA: 150] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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79
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Sharma BK, Srinivasan R, Kapil S, Singla B, Chawla YK, Chakraborti A, Saini N, Duseja A, Das A, Kalra N, Dhiman RK. Angiogenic and anti-angiogenic factor gene transcript level quantitation by quantitative real time PCR in patients with hepatocellular carcinoma. Mol Biol Rep 2013; 40:5843-52. [DOI: 10.1007/s11033-013-2690-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 09/14/2013] [Indexed: 12/17/2022]
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Clarke JM, Hurwitz HI. Understanding and targeting resistance to anti-angiogenic therapies. J Gastrointest Oncol 2013; 4:253-63. [PMID: 23997938 DOI: 10.3978/j.issn.2078-6891.2013.036] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 05/21/2013] [Indexed: 12/14/2022] Open
Abstract
Therapies targeting tumor angiogenesis are used in a variety of malignancies, however not all patients benefit from treatment and impact on tumor control may be transient and modest. Mechanisms of resistance to anti-angiogenic therapies can be broadly categorized into VEGF-axis dependent alterations, non-VEGF pathways, and stromal cell interactions. Complimentary combinations of agents that inhibit alternative mechanisms of blood vessel formation may optimize inhibition of angiogenesis and improve clinical benefit for patients. The purpose of this review is to detail the preclinical evidence for mechanisms of angiogenic resistance and provide an overview of novel therapeutic approaches exploiting these pathways.
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Affiliation(s)
- Jeffrey M Clarke
- Duke Cancer Institute, Duke University Medical Center, Durham, NC, USA
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81
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Development of a biosensor-based immunogenicity assay capable of blocking soluble drug target interference. J Immunol Methods 2013; 396:44-55. [PMID: 23933325 DOI: 10.1016/j.jim.2013.07.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Revised: 07/23/2013] [Accepted: 07/23/2013] [Indexed: 01/13/2023]
Abstract
As with other protein therapeutics, trebananib (AMG 386), an investigational peptide Fc-fusion protein ("peptibody") that inhibits angiogenesis by neutralizing the interaction of angiopoietin-1 (Ang1) and angiopoietin-2 (Ang2) with the Tie2 receptor, has the potential to trigger an immune response in cancer patients treated with the therapeutic. An electrochemiluminescence bridging anti-drug antibody (ADA) assay that was utilized to support early-phase clinical trials in the development of trebananib was found to lack adequate sensitivity and drug tolerance in later-phase clinical studies when higher doses of trebananib were administered. Therefore, we developed a surface plasmon resonance (SPR) immunoassay method utilizing a secondary confirmatory detector antibody (goat anti-human IgG F[ab']2) known to cross-react with human IgG and IgM to better assess the potential impact of immunogenicity on the pharmacokinetics, pharmacodynamics, and toxicity of trebananib. The SPR method was more sensitive than the electrochemiluminescence bridging assay because of signal amplification from the confirmatory binding of the detector antibody; drug tolerance was improved since antibody binding avidity does not affect detection on this platform. Despite the inability of the confirmatory detector antibody to bind angiopoietins in protein-free buffer, false-positive ADA results were generated from patient serum samples containing Ang1 and Ang2 through an apparently specific binding between the angiopoietins and the confirmatory detector antibody, likely mediated by the interaction of the angiopoietins with serum immunoglobulins. Addition to the sample diluent of a human antibody that specifically binds to Ang1 and Ang2 with high affinity resulted in a complete block of angiopoietin interference without affecting ADA detection. This biosensor-based assay provides a reliable method for assessing immunogenicity in phase 3 clinical trials.
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82
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Buehler D, Rush P, Hasenstein JR, Rice SR, Hafez GR, Longley BJ, Kozak KR. Expression of angiopoietin-TIE system components in angiosarcoma. Mod Pathol 2013; 26:1032-40. [PMID: 23558570 PMCID: PMC3706492 DOI: 10.1038/modpathol.2013.43] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 01/07/2013] [Accepted: 01/08/2013] [Indexed: 01/08/2023]
Abstract
Angiosarcoma is an aggressive malignancy of endothelial differentiation. Potential roles of the endothelial angiopoietin-tunica interna endothelial cell kinase (ANGPT-TIE) system in angiosarcoma diagnosis, pathogenesis, prognosis and treatment are undefined. To examine the expression and prognostic significance of angiopoietin-1, angiopoietin-2, TIE1 and TEK (TIE2) proteins in angiosarcoma, we immunohistochemically evaluated clinically annotated human angiosarcoma samples. Correlations of protein expression with overall survival and pathological features were explored. The cohort included 51 patients diagnosed with angiosarcoma at the age of 30-86 years (median 67). The 5-year overall survival was 45% with a median of 26 months. Moderate to strong expression of angiopoietin-1, TIE1 and TEK (TIE2) was identified in the majority of angiosarcomas and moderate to strong expression of angiopoietin-2 was observed in 42% of angiosarcomas. Increased angiopoietin-1 expression correlated with improved survival. Non-significant trends toward longer survival were also observed with increased TIE1 and TEK (TIE2) expression. Increased expression of angiopoietin-2, TIE1 and TEK (TIE2) was associated with vasoformative architecture. No differences in expression of these proteins were observed when patients were segregated by age, gender, presence or absence of metastases at diagnosis, primary tumor location, radiation association or the presence of necrosis. We conclude that components of the ANGPT-TIE system are commonly expressed in angiosarcomas. Reduced expression of these proteins is associated with non-vasoformative and clinically more aggressive lesions.
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Affiliation(s)
- Darya Buehler
- Department of Pathology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Patrick Rush
- Department of Pathology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Jason R. Hasenstein
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Stephanie R. Rice
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Gholam Reza Hafez
- Department of Pathology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - B. Jack Longley
- Department of Dermatology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Kevin R Kozak
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
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83
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Goel S, Gupta N, Walcott BP, Snuderl M, Kesler CT, Kirkpatrick ND, Heishi T, Huang Y, Martin JD, Ager E, Samuel R, Wang S, Yazbek J, Vakoc BJ, Peterson RT, Padera TP, Duda DG, Fukumura D, Jain RK. Effects of vascular-endothelial protein tyrosine phosphatase inhibition on breast cancer vasculature and metastatic progression. J Natl Cancer Inst 2013; 105:1188-201. [PMID: 23899555 DOI: 10.1093/jnci/djt164] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND The solid tumor microvasculature is characterized by structural and functional abnormality and mediates several deleterious aspects of tumor behavior. Here we determine the role of vascular endothelial protein tyrosine phosphatase (VE-PTP), which deactivates endothelial cell (EC) Tie-2 receptor tyrosine kinase, thereby impairing maturation of tumor vessels. METHODS AKB-9778 is a first-in-class VE-PTP inhibitor. We examined its effects on ECs in vitro and on embryonic angiogenesis in vivo using zebrafish assays. We studied the impact of AKB-9778 therapy on the tumor vasculature, tumor growth, and metastatic progression using orthotopic models of murine mammary carcinoma as well as spontaneous and experimental metastasis models. Finally, we used endothelial nitric oxide synthase (eNOS)-deficient mice to establish the role of eNOS in mediating the effects of VE-PTP inhibition. All statistical tests were two-sided. RESULTS AKB-9778 induced ligand-independent Tie-2 activation in ECs and impaired embryonic zebrafish angiogenesis. AKB-9778 delayed the early phase of mammary tumor growth by maintaining vascular maturity (P < .01, t test); slowed growth of micrometastases (P < .01, χ(2) test) by preventing extravasation of tumor cells (P < 0.01, Fisher exact test), resulting in a trend toward prolonged survival (27.0 vs 36.5 days; hazard ratio of death = 0.33, 95% confidence interval = 0.11 to 1.03; P = .05, Mantel-Cox test); and stabilized established primary tumor blood vessels, enhancing tumor perfusion (P = .03 for 4T1 tumor model and 0.05 for E0771 tumor model, by two-sided t tests) and, hence, radiation response (P < .01, analysis of variance; n = 7 mice per group). The effects of AKB-9778 on tumor vessels were mediated in part by endothelial nitric oxide synthase activation. CONCLUSIONS Our results demonstrate that pharmacological VE-PTP inhibition can normalize the structure and function of tumor vessels through Tie-2 activation, which delays tumor growth, slows metastatic progression, and enhances response to concomitant cytotoxic treatments.
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Affiliation(s)
- Shom Goel
- Edwin L. Steele Laboratory for Tumor Biology, Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
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Hudson BD, Kulp KS, Loots GG. Prostate cancer invasion and metastasis: insights from mining genomic data. Brief Funct Genomics 2013; 12:397-410. [PMID: 23878130 DOI: 10.1093/bfgp/elt021] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Prostate cancer (PCa) is the second most commonly diagnosed malignancy in men in the Western world and the second leading cause of cancer-related deaths among men worldwide. Although most cancers have the potential to metastasize under appropriate conditions, PCa favors the skeleton as a primary site of metastasis, suggesting that the bone microenvironment is conducive to its growth. PCa metastasis proceeds through a complex series of molecular events that include angiogenesis at the site of the original tumor, local migration within the primary site, intravasation into the blood stream, survival within the circulation, extravasation of the tumor cells to the target organ and colonization of those cells within the new site. In turn, each one of these steps involves a complicated chain of events that utilize multiple protein-protein interactions, protein signaling cascades and transcriptional changes. Despite the urgent need to improve current biomarkers for diagnosis, prognosis and drug resistance, advances have been slow. Global gene expression methods such as gene microarrays and RNA sequencing enable the study of thousands of genes simultaneously and allow scientists to examine molecular pathways of cancer pathogenesis. In this review, we summarize the current literature that explored high-throughput transcriptome analysis toward the advancement of biomarker discovery for PCa. Novel biomarkers are strongly needed to enable more accurate detection of PCa, improve prediction of tumor aggressiveness and facilitate the discovery of new therapeutic targets for tailored medicine. Promising molecular markers identified from gene expression profiling studies include HPN, CLU1, WT1, WNT5A, AURKA and SPARC.
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Affiliation(s)
- Bryan D Hudson
- Biology and Biotechnology Division, Lawrence Livermore National Laboratory, 7000 East Avenue, L-452, Livermore, CA 94550, USA.
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85
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Eklund L, Saharinen P. Angiopoietin signaling in the vasculature. Exp Cell Res 2013; 319:1271-80. [PMID: 23500414 DOI: 10.1016/j.yexcr.2013.03.011] [Citation(s) in RCA: 175] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2012] [Revised: 03/03/2013] [Accepted: 03/04/2013] [Indexed: 01/26/2023]
Abstract
The angiopoietin (Ang) growth factors and the endothelial Tie receptors regulate blood and lymphatic vessel development, and vascular permeability, inflammation, angiogenic remodeling and tumor vascularization in adult tissues. The angiopoietins activate the Tie receptors in unique in trans complexes at endothelial cell-cell and cell-matrix contacts. In addition, integrins have been implicated in the regulation of Ang-Tie signaling. Recent interest has focused on the function of angiopoietin-2 and its inhibition in the tumor vasculature and also in other pathological conditions associated with endothelial dysfunction. Here we review the current understanding of the signaling functions of the Ang-Tie pathway and its potential for future development of targeted vascular therapeutics.
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Affiliation(s)
- Lauri Eklund
- Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology, University of Oulu, Finland
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86
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Eroglu Z, Stein CA, Pal SK. Targeting angiopoietin-2 signaling in cancer therapy. Expert Opin Investig Drugs 2013; 22:813-25. [DOI: 10.1517/13543784.2013.793306] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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87
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Szot CS, Buchanan CF, Freeman JW, Rylander MN. In vitro angiogenesis induced by tumor-endothelial cell co-culture in bilayered, collagen I hydrogel bioengineered tumors. Tissue Eng Part C Methods 2013; 19:864-74. [PMID: 23516987 DOI: 10.1089/ten.tec.2012.0684] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Although successful remission has been achieved when cancer is diagnosed and treated during its earliest stages of development, a tumor that has established neovascularization poses a significantly greater risk of mortality. The inability to recapitulate the complexities of a maturing in vivo tumor microenvironment in an in vitro setting has frustrated attempts to identify and test anti-angiogenesis therapies that are effective at permanently halting cancer progression. We have established an in vitro tumor angiogenesis model driven solely by paracrine signaling between MDA-MB-231 breast cancer cells and telomerase-immortalized human microvascular endothelial (TIME) cells co-cultured in a spatially relevant manner. The bilayered bioengineered tumor model consists of TIME cells cultured as an endothelium on the surface of an acellular collagen I hydrogel under which MDA-MB-231 cells are cultured in a separate collagen I hydrogel. Results showed that TIME cells co-cultured with the MDA-MB-231 cells demonstrated a significant increase in cell number, rapidly developed an elongated morphology, and invasively sprouted into the underlying acellular collagen I layer. Comparatively, bioengineered tumors cultured with less aggressive MCF7 breast cancer cells did not elicit an angiogenic response. Angiogenic sprouting was demonstrated by the formation of a complex capillary-like tubule network beneath the surface of a confluent endothelial monolayer with lumen formation and anastomosing branches. In vitro angiogenesis was dependent on vascular endothelial growth factor secretion, matrix concentration, and duration of co-culture. Basic fibroblast growth factor supplemented to the co-cultures augmented angiogenic sprouting. The development of improved preclinical tumor angiogenesis models, such as the one presented here, is critical for accurate evaluation and refinement of anti-angiogenesis therapies.
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Affiliation(s)
- Christopher S Szot
- 1 School of Biomedical Engineering and Sciences, Virginia Polytechnic Institute-Wake Forest University , Blacksburg, Virginia
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88
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Diaz-Sanchez A, Matilla A, Nuñez O, Lorente R, Fernandez A, Rincón D, Campos R, Bañares R, Clemente G. Serum angiopoietin-2 level as a predictor of tumor invasiveness in patients with hepatocellular carcinoma. Scand J Gastroenterol 2013; 48:334-43. [PMID: 23249262 DOI: 10.3109/00365521.2012.746391] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Because hepatocellular carcinoma (HCC) has important angiogenic activity, the expression of angiopoietin-2 (Ang-2) may have a pathogenic role. The information about the influence of serum Ang-2 (sAng-2) in patients with HCC is scarce. AIMS The aim was to assess the association between sAng-2 levels and characteristics of tumor and liver disease in patients with HCC. METHODS sAng-2 concentrations in peripheral (sAng-2-P) and hepatic (sAng-2-H) veins were analyzed by ELISA in 33 patients with chronic liver disease who underwent a splanchnic hemodynamic study. Thirty-two patients received treatment for HCC. RESULTS The median age was 61 years and 79% were male. Hepatitis C infection (70%) was the main etiology. Most patients were Child-Pugh grade A (72.7%). sAng-2-P and sAng-2-H were well correlated (r = 0.95; p < 0.0001). A significant association was found between sAng-2-H and lobar tumor extension, vascular thrombosis, BCLC staging, infiltrating pattern, abnormal alpha-fetoprotein level, fulfillment of the Milan criteria, and performance of nonsystemic treatment. sAng-2-H also showed a significant correlation with the MELD score (r = 0.49; p = 0.007), albumin (r = -0.63; p < 0.001), and HVPG (r = 0.44; p = 0.02). Eleven patients received treatment with radiofrequency ablation and eight with transarterial chemoembolization. HCC treatment did not influence the sAng-2 concentration while the necrosis response to treatment was not influenced by previous sAng-2 levels. CONCLUSIONS Ang-2 seems to play an important role in the angiogenic processes of HCC and its serum levels are associated with tumor characteristics and invasive behavior. Our results suggest that Ang-2 is not related with treatment response and its level is not modified by treatment.
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Affiliation(s)
- Antonio Diaz-Sanchez
- Gastroenterology Unit, Hospital Universitario del Sureste, Arganda del Rey, Madrid, Spain.
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89
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Zheng X, Young Koh G, Jackson T. A continuous model of angiogenesis: Initiation, extension, and maturation of new blood vessels modulated by vascular endothelial growth factor, angiopoietins, platelet-derived growth factor-B, and pericytes. ACTA ACUST UNITED AC 2013. [DOI: 10.3934/dcdsb.2013.18.1109] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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90
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Danza K, Pilato B, Lacalamita R, Addati T, Giotta F, Bruno A, Paradiso A, Tommasi S. Angiogenetic axis angiopoietins/Tie2 and VEGF in familial breast cancer. Eur J Hum Genet 2012; 21:824-30. [PMID: 23232696 DOI: 10.1038/ejhg.2012.273] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 10/25/2012] [Accepted: 11/14/2012] [Indexed: 11/09/2022] Open
Abstract
Angiogenesis leads to the formation of blood vessels from pre-existing ones, allowing tumor growth. Vascular endothelial growth factor (VEGF) and Angiopoietins (Ang-1, Ang-2) have a pivotal role in tumor angiogenesis but few data regarding their role in hereditary breast cancer are available. The aim of the present study was to analyze Ang-1, Ang-2, tyrosine-protein kinase receptor Tie2 and VEGF expression and their correlation in a cohort of familial and sporadic breast cancers in order to verify whether the presence of germline mutations in BRCA may have a role in tumor microenvironment regulation. Tumor samples from a cohort of 41 patients with a first diagnosis and a family history of breast cancer and 19 patients with sporadic breast cancers were enrolled. The expression of Tie2, Ang-1, Ang-2 and VEGF were analyzed by quantitative real-time PCR. Patients harboring BRCA mutations had higher levels of Ang-1 (P=0.05), Ang-2 (P=0.02) and VEGF (P=0.04) mRNA compared with those without BRCA mutations (BRCAX). The same was observed in triple-negative breast cancer (TNBC). Moreover, a positive correlation between Ang-2 and VEGF was found in both the familial breast cancer group (BRCA carriers: r=0.83; P<0.0001 and BRCAX: r=0.58; P=0.008) and in TNBC (r=0.62; P=0.007). The higher levels of Ang-1, Ang-2 and VEGF mRNA found in BRCA carriers and TNBCs suggest that they could be attractive angiogenic therapeutic targets in these breast cancers.
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Affiliation(s)
- K Danza
- Molecular Genetic Laboratory, National Cancer Research Centre, Istituto Tumori Giovanni Paolo II, Bari, Italy
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91
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Ran S, Montgomery KE. Macrophage-mediated lymphangiogenesis: the emerging role of macrophages as lymphatic endothelial progenitors. Cancers (Basel) 2012; 4:618-57. [PMID: 22946011 PMCID: PMC3430523 DOI: 10.3390/cancers4030618] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
It is widely accepted that macrophages and other inflammatory cells support tumor progression and metastasis. During early stages of neoplastic development, tumor-infiltrating macrophages (TAMs) mount an immune response against transformed cells. Frequently, however, cancer cells escape the immune surveillance, an event that is accompanied by macrophage transition from an anti-tumor to a pro-tumorigenic type. The latter is characterized by high expression of factors that activate endothelial cells, suppress immune response, degrade extracellular matrix, and promote tumor growth. Cumulatively, these products of TAMs promote tumor expansion and growth of both blood and lymphatic vessels that facilitate metastatic spread. Breast cancers and other epithelial malignancies induce the formation of new lymphatic vessels (i.e., lymphangiogenesis) that leads to lymphatic and subsequently, to distant metastasis. Both experimental and clinical studies have shown that TAMs significantly promote tumor lymphangiogenesis through paracrine and cell autonomous modes. The paracrine effect consists of the expression of a variety of pro-lymphangiogenic factors that activate the preexisting lymphatic vessels. The evidence for cell-autonomous contribution is based on the observed tumor mobilization of macrophage-derived lymphatic endothelial cell progenitors (M-LECP) that integrate into lymphatic vessels prior to sprouting. This review will summarize the current knowledge of macrophage-dependent growth of new lymphatic vessels with specific emphasis on an emerging role of macrophages as lymphatic endothelial cell progenitors (M-LECP).
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Affiliation(s)
- Sophia Ran
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1-217-545-7026; Fax: +1-217-545-7333
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92
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Krug S, Huth J, Göke F, Buchholz M, Gress TM, Göke R, Lankat-Buttgereit B. Knock-down of Pdcd4 stimulates angiogenesis via up-regulation of angiopoietin-2. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2012; 1823:789-99. [DOI: 10.1016/j.bbamcr.2012.01.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 01/12/2012] [Accepted: 01/13/2012] [Indexed: 12/11/2022]
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93
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Nagahashi M, Ramachandran S, Kim EY, Allegood JC, Rashid OM, Yamada A, Zhao R, Milstien S, Zhou H, Spiegel S, Takabe K. Sphingosine-1-phosphate produced by sphingosine kinase 1 promotes breast cancer progression by stimulating angiogenesis and lymphangiogenesis. Cancer Res 2012; 72:726-35. [PMID: 22298596 DOI: 10.1158/0008-5472.can-11-2167] [Citation(s) in RCA: 247] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Sphingosine-1-phosphate (S1P) is a pleiotropic bioactive lipid mediator that promotes breast cancer progression by diverse mechanisms that remain somewhat unclear. Here we report pharmacologic evidence of a critical role for sphingosine kinase 1 (SphK1) in producing S1P and mediating tumor-induced hemangiogenesis and lymphangiogenesis in a murine model of breast cancer metastasis. S1P levels increased both in the tumor and the circulation. In agreement, serum S1P levels were significantly elevated in stage IIIA human breast cancer patients, compared with age/ethnicity-matched healthy volunteers. However, treatment with the specific SphK1 inhibitor SK1-I suppressed S1P levels, reduced metastases to lymph nodes and lungs, and decreased overall tumor burden of our murine model. Both S1P and angiopoietin 2 (Ang2) stimulated hemangiogenesis and lymphangiogenesis in vitro, whereas SK1-I inhibited each process. We quantified both processes in vivo from the same specimen by combining directed in vivo angiogenesis assays with fluorescence-activated cell sorting, thereby confirming the results obtained in vitro. Notably, SK1-I decreased both processes not only at the primary tumor but also in lymph nodes, with peritumoral lymphatic vessel density reduced in SK1-I-treated animals. Taken together, our findings show that SphK1-produced S1P is a crucial mediator of breast cancer-induced hemangiogenesis and lymphangiogenesis. Our results implicate SphK1 along with S1P as therapeutic targets in breast cancer.
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Affiliation(s)
- Masayuki Nagahashi
- Division of Surgical Oncology, Department of Biochemistry and Molecular Biology, and the Massey Cancer Center, Virginia Commonwealth University School of Medicine, Richmond, Virginia 23298, USA
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94
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Petrillo M, Scambia G, Ferrandina G. Novel targets for VEGF-independent anti-angiogenic drugs. Expert Opin Investig Drugs 2012; 21:451-72. [PMID: 22339615 DOI: 10.1517/13543784.2012.661715] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
INTRODUCTION In the last decades, the active research in the field of tumor angiogenesis led to the development of a class of agents providing an effective inhibition of neovessels formation through the blockade of VEGF-related pathways. More recently, the identification of several non-VEGF factors such as PDGF, FGF, HGF, angiopoietins, ALK1/endoglin, endothelis and ephrins involved in tumor angiogenesis have emphasized the need to develop agents targeting multiple pro-angiogenic pathways. AREAS COVERED This review aimed at summarizing the role of non-VEGF molecular pathways in targeting tumor angiogenesis. Preclinical and clinical data for investigational agents against non-VEGF targets have been reviewed emphasizing the role of combined inhibition strategies. EXPERT OPINION Besides the successful development of drugs providing a specific VEGF blockade, novel agents targeting alternative angiogenesis-related pathways are being tested. Although it seems that the potential clinical usefulness of these novel compounds have been not yet fully investigated, sunitinib, sorafenib, pazopanib and other multikinase inhibitors have certainly displayed encouraging results. A more in-depth clarification of anti-angiogenic agents is still needed, in order to design the best clinical setting and schedule for target-based agents and possibly anticipate potential tools to overcome the emerging issue of anti-angiogenic drug resistance.
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Affiliation(s)
- Marco Petrillo
- Catholic University of the Sacred Heart, Gynecologic Oncology Unit, Department of Oncology, Campobasso, Italy
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95
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Staton CA, Hoh L, Baldwin A, Shaw L, Globe J, Cross SS, Reed MW, Brown NJ. Angiopoietins 1 and 2 and Tie-2 receptor expression in human ductal breast disease. Histopathology 2012; 59:256-63. [PMID: 21884204 DOI: 10.1111/j.1365-2559.2011.03920.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AIMS This study aimed to identify the involvement of the angiopoietin/Tie-2 receptor system in breast cancer development, progression, metastasis and angiogenesis. METHODS AND RESULTS We quantified and correlated angiopoietin-1 (Ang-1), Ang-2 and Tie-2 expression in sections of normal human breast, benign and premalignant hyperplastic tissue, pre-invasive and invasive cancer, and compared these findings with our previously published data on vascular endothelial growth factor (VEGF) and microvessel density (MVD) in the same samples. A breast cancer tissue microarray was used to evaluate the prognostic value of these factors. Histological analysis revealed a significant decrease in Ang-1 expression (P = 0.001) and an inverse correlation with MVD (r = -0.442, P = 0.008) and VEGF (r = -0.510, P = 0.002) in the non-invasive lesions. In contrast Ang-2 expression increased significantly (P = 0.0004) with increasing severity of lesion and correlated with MVD (r = 0.570; P = 0.0002), while Tie-2 expression remained relatively unchanged. Expression of all three factors was reduced in invasive breast cancer and did not correlate with oestrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor receptor 2 (HER2), lymph node status or tumour grade. CONCLUSIONS These data suggest that a change in the angiopoietin balance in favour of Ang-2 is associated with the angiogenic switch at the onset of hyperplasia in the breast. However, angiopoietins and the Tie-2 receptor are not related to known prognostic indicators in invasive breast cancer.
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Affiliation(s)
- Carolyn A Staton
- Academic Unit of Surgical Oncology, Faculty of Medicine, Dentistry and Health, University of Sheffield, Sheffield, UK.
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96
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Cascone T, Heymach JV. Targeting the angiopoietin/Tie2 pathway: cutting tumor vessels with a double-edged sword? J Clin Oncol 2011; 30:441-4. [PMID: 22184396 DOI: 10.1200/jco.2011.38.7621] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- Tina Cascone
- The University of Texas MD Anderson Cancer Center, Unit 432, 1515 Holcombe Blvd, Houston, TX 77030, USA
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97
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High bone marrow angiopoietin-1 expression is an independent poor prognostic factor for survival in patients with myelodysplastic syndromes. Br J Cancer 2011; 105:975-82. [PMID: 21878936 PMCID: PMC3185953 DOI: 10.1038/bjc.2011.340] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Background: Angiogenic factors have an essential role in normal and pathologic angiogenesis. However, the clinical implication of angiogenic factor expression in myelodysplastic syndromes (MDS) remains unclear. Methods: In this study, we sought to investigate the prognostic impact of the expression of genes encoding angiopoietin-1 (Ang-1), Ang-2, the receptor Tie2, vascular endothelial growth factor-A (VEGF-A) and VEGF-C in the bone marrow (BM) in 208 patients with newly diagnosed primary MDS. Results: BM Ang-1 expression was significantly higher in MDS patients, especially those with higher-risk subtypes, than in normal controls. With a median follow-up time of 32.9 months, the disease transformed to acute leukaemia more frequently in the patients bearing higher Ang-1 expression than in those with lower expression (31.5% vs 18.6%, P=0.023). The MDS patients with higher Ang-1 expression had shorter overall survival than those with lower expression (median 20.8±4.5 months vs 63.3±17.8 months, P<0.001). Multivariate analyses showed that higher Ang-1 expression was an independent unfavourable prognostic factor for overall survival. There was no impact of the expression of other angiogenic factors on survival. Conclusion: BM Ang-1 expression may serve as a new biomarker to predict clinical outcome in MDS patients.
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98
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Schulz P, Fischer C, Detjen KM, Rieke S, Hilfenhaus G, von Marschall Z, Böhmig M, Koch I, Kehrberger J, Hauff P, Thierauch KH, Alves F, Wiedenmann B, Scholz A. Angiopoietin-2 drives lymphatic metastasis of pancreatic cancer. FASEB J 2011; 25:3325-35. [PMID: 21685330 DOI: 10.1096/fj.11-182287] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Lymphatic metastasis constitutes a critical route of disease dissemination, which limits the prognosis of patients with pancreatic ductal adenocarcinoma (PDAC). As lymphangiogenesis has been implicated in stimulation of lymphatic metastasis by vascular endothelial growth factor-C (VEGF-C) and VEGF-D, we studied the effect of the angioregulatory growth factor angiopoietin-2 (Ang-2) on PDAC progression. Ang-2 was found to be expressed in transformed cells of human PDAC specimens, with corresponding Tie-2 receptors present on blood and lymphatic endothelium. In vitro in PDAC cells, Ang-2 was subject to autocrine/paracrine TGF-β stimulation (2-fold induction, P=0.0106) acting on the -61- to +476-bp element of the human Ang-2 promoter. In turn, Ang-2 regulated the expression of genes involved in cell motility and tumor suppression. Orthotopic PDAC xenografts with forced expression of Ang-2, but not Ang-1, displayed increased blood and lymphatic vessel density, and an enhanced rate of lymphatic metastasis (6.7- to 9.1-fold, P<0.01), which was prevented by sequestration of Ang-2 via coexpression of soluble Tie-2. Notably, elevated circulating Ang-2 in patients with PDAC correlated with the extent of lymphatic metastasis. Furthermore, median survival was reduced from 28.4 to 7.7 mo in patients with circulating Ang-2 ≥ 75th percentile (P=0.0005). These findings indicate that Ang-2 participates in the control of lymphatic metastasis, constitutes a noninvasive prognostic biomarker, and may provide an accessible therapeutic target in PDAC.
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Affiliation(s)
- Petra Schulz
- Medizinische Klinik mit Schwerpunkt Hepatologie und Gastroenterologie, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, D-13353 Berlin, Germany
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99
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Chen HH, Chai L, Wang SQ, Shi ZJ, Wu QL. Angiopoietin-2 inhibits the growth of tongue carcinoma without affecting expression of vascular endothelial growth factor. Int J Oral Maxillofac Surg 2011; 40:628-32. [DOI: 10.1016/j.ijom.2010.11.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2007] [Revised: 09/22/2010] [Accepted: 11/05/2010] [Indexed: 11/24/2022]
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100
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Coxon A, Bready J, Min H, Kaufman S, Leal J, Yu D, Lee TA, Sun JR, Estrada J, Bolon B, McCabe J, Wang L, Rex K, Caenepeel S, Hughes P, Cordover D, Kim H, Han SJ, Michaels ML, Hsu E, Shimamoto G, Cattley R, Hurh E, Nguyen L, Wang SX, Ndifor A, Hayward IJ, Falcón BL, McDonald DM, Li L, Boone T, Kendall R, Radinsky R, Oliner JD. Context-dependent role of angiopoietin-1 inhibition in the suppression of angiogenesis and tumor growth: implications for AMG 386, an angiopoietin-1/2-neutralizing peptibody. Mol Cancer Ther 2011; 9:2641-51. [PMID: 20937592 DOI: 10.1158/1535-7163.mct-10-0213] [Citation(s) in RCA: 124] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
AMG 386 is an investigational first-in-class peptide-Fc fusion protein (peptibody) that inhibits angiogenesis by preventing the interaction of angiopoietin-1 (Ang1) and Ang2 with their receptor, Tie2. Although the therapeutic value of blocking Ang2 has been shown in several models of tumorigenesis and angiogenesis, the potential benefit of Ang1 antagonism is less clear. To investigate the consequences of Ang1 neutralization, we have developed potent and selective peptibodies that inhibit the interaction between Ang1 and its receptor, Tie2. Although selective Ang1 antagonism has no independent effect in models of angiogenesis-associated diseases (cancer and diabetic retinopathy), it induces ovarian atrophy in normal juvenile rats and inhibits ovarian follicular angiogenesis in a hormone-induced ovulation model. Surprisingly, the activity of Ang1 inhibitors seems to be unmasked in some disease models when combined with Ang2 inhibitors, even in the context of concurrent vascular endothelial growth factor inhibition. Dual inhibition of Ang1 and Ang2 using AMG 386 or a combination of Ang1- and Ang2-selective peptibodies cooperatively suppresses tumor xenograft growth and ovarian follicular angiogenesis; however, Ang1 inhibition fails to augment the suppressive effect of Ang2 inhibition on tumor endothelial cell proliferation, corneal angiogenesis, and oxygen-induced retinal angiogenesis. In no case was Ang1 inhibition shown to (a) confer superior activity to Ang2 inhibition or dual Ang1/2 inhibition or (b) antagonize the efficacy of Ang2 inhibition. These results imply that Ang1 plays a context-dependent role in promoting postnatal angiogenesis and that dual Ang1/2 inhibition is superior to selective Ang2 inhibition for suppression of angiogenesis in some postnatal settings.
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Affiliation(s)
- Angela Coxon
- Department of Oncology Research, Amgen, Inc., Thousand Oaks, California 91320, USA
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