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Jia Y, He P, Ma X, Lv K, Liu Y, Xu Y. PIK3IP1: structure, aberration, function, and regulation in diseases. Eur J Pharmacol 2024; 977:176753. [PMID: 38897445 DOI: 10.1016/j.ejphar.2024.176753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 06/01/2024] [Accepted: 06/16/2024] [Indexed: 06/21/2024]
Abstract
Phosphoinositide 3-kinase (PI3K) pathway, controlling diverse functions in cells, is one of the most frequently dysregulated pathways in cancer. Several negative regulators have been reported to intricately constrain the overactivation of PI3K pathway. Phosphatidylinoinosidine-3-kinase interacting protein 1 (PIK3IP1), as a unique transmembrane protein, is a newly discovered negative regulator of PI3K pathway. PIK3IP1 negatively regulates PI3K activity by directly binding to the p110 catalytic subunit of PI3K. It has been reported that PIK3IP1 is frequently low expressed in tumors and autoimmune diseases. In tumor cells and impaired cardiomyocyte, PIK3IP1 inhibits cell proliferation and survival. Consistently, the expression of PIK3IP1 is related with the condition of cancer. In addition, PIK3IP1 inhibits the inflammatory response and immune function via maintaining the quiescent state of immune cells. Thus, low expression of PIK3IP1 represents the severe condition of autoimmune diseases. PIK3IP1 is regulated by transcription factors, epigenetic factors or micro-RNAs to facilitate its normal function in different cellular contexts. This review integrates the total findings on PIK3IP1 in different disease, and summaries the structure, biological functions and regulatory mechanisms of PIK3IP1.
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Affiliation(s)
- Yingjie Jia
- Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China
| | - Pengxing He
- Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China
| | - Xubin Ma
- Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China
| | - Kaili Lv
- Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China
| | - Ying Liu
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Yichao Xu
- Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China; State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, Zhengzhou, 450001, China.
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Crepaldi T, Gallo S, Comoglio PM. The MET Oncogene: Thirty Years of Insights into Molecular Mechanisms Driving Malignancy. Pharmaceuticals (Basel) 2024; 17:448. [PMID: 38675409 PMCID: PMC11054789 DOI: 10.3390/ph17040448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2024] [Revised: 03/22/2024] [Accepted: 03/27/2024] [Indexed: 04/28/2024] Open
Abstract
The discovery and subsequent research on the MET oncogene's role in cancer onset and progression have illuminated crucial insights into the molecular mechanisms driving malignancy. The identification of MET as the hepatocyte growth factor (HGF) receptor has paved the path for characterizing the MET tyrosine kinase activation mechanism and its downstream signaling cascade. Over the past thirty years, research has established the importance of HGF/MET signaling in normal cellular processes, such as cell dissociation, migration, proliferation, and cell survival. Notably, genetic alterations that lead to the continuous activation of MET, known as constitutive activation, have been identified as oncogenic drivers in various cancers. The genetic lesions affecting MET, such as exon skipping, gene amplification, and gene rearrangements, provide valuable targets for therapeutic intervention. Moreover, the implications of MET as a resistance mechanism to targeted therapies emphasize the need for combination treatments that include MET inhibitors. The intriguing "flare effect" phenomenon, wherein MET inhibition can lead to post-treatment increases in cancer cell proliferation, underscores the dynamic nature of cancer therapeutics. In human tumors, increased protein expression often occurs without gene amplification. Various mechanisms may cause an overexpression: transcriptional upregulation induced by other oncogenes; environmental factors (such as hypoxia or radiation); or substances produced by the reactive stroma, such as inflammatory cytokines, pro-angiogenic factors, and even HGF itself. In conclusion, the journey to understanding MET's involvement in cancer onset and progression over the past three decades has not only deepened our knowledge, but has also paved the way for innovative therapeutic strategies. Selective pharmacological inactivation of MET stands as a promising avenue for achieving cancer remission, particularly in cases where MET alterations are the primary drivers of malignancy.
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Affiliation(s)
- Tiziana Crepaldi
- Department of Oncology, University of Turin, Regione Gonzole 10, 10143 Orbassano, Italy; (T.C.); (S.G.)
- Candiolo Cancer Institute, FPO-IRCCS, SP142, Km 3.95, 10060 Candiolo, Italy
| | - Simona Gallo
- Department of Oncology, University of Turin, Regione Gonzole 10, 10143 Orbassano, Italy; (T.C.); (S.G.)
- Candiolo Cancer Institute, FPO-IRCCS, SP142, Km 3.95, 10060 Candiolo, Italy
| | - Paolo Maria Comoglio
- IFOM ETS—The AIRC Institute of Molecular Oncology, Via Adamello 16, 20139 Milano, Italy
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Luo X, Chang HM, Yi Y, Leung PCK, Sun Y. Bone morphogenetic protein 2 upregulates SERPINE2 expression through noncanonical SMAD2/3 and p38 MAPK signaling pathways in human granulosa-lutein cells. FASEB J 2021; 35:e21845. [PMID: 34369625 DOI: 10.1096/fj.202100670rr] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 07/21/2021] [Accepted: 07/23/2021] [Indexed: 12/12/2022]
Abstract
Serine protease inhibitor-E2 (SERPINE2) is highly expressed in the granulosa cells of growing follicles and the dynamic changes in SERPINE2 expression are correlated with follicular development and ovulation in several mammals, including mice, cattle, sheep, and humans. Bone morphogenetic proteins (BMPs) and their functional receptors are extensively expressed in the ovary and play critical roles in the regulation of ovarian folliculogenesis and luteal function. To date, whether BMPs regulate the expression of SERPINE2 during human follicular development remains to be elucidated. The aim of this study was to investigate the effects of BMPs on the regulation of SERPINE2 expression (a major regulator of plasminogen activators [PA]) and the underlying mechanisms using primary and immortalized human granulosa-lutein (hGL) cells. Our results demonstrated that these BMPs (BMP2, BMP4, BMP6, BMP7, and BMP15) induced differential upregulation of SERPINE2 expression. In this regard, BMP2 is the major modulator that has the best cellular activity, which further decreased the production of urokinase PA and tissue PA in hGL cells. In addition to canonical SMAD1/5/8 signaling, BMP2 also activates noncanonical SMAD2/3 and p38 mitogen-activated protein kinase (MAPK) signaling. Using two inhibition approaches (kinase receptor inhibitors and siRNA-mediated knockdown), we found that SMAD2/3-SMAD4 and p38 MAPK, but not SMAD1/5/8 signaling, was involved in the BMP2-induced upregulation of SERPINE2 expression via activin receptor-like kinase 3. These findings deepen our understanding of the differential effect of BMPs in regulating follicular function and provide new insights of the molecular mechanisms by which BMP2 regulates the expression of SERPINE2 in human granulosa cells.
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Affiliation(s)
- Xiaoyan Luo
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.,Department of Obstetrics and Gynaecology, BC Children's Hospital Research Institute, University of British Columbia, Vancouver, BC, Canada.,Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.,Henan Provincial Obstetrical and Gynecological Diseases (Reproductive Medicine) Clinical Research Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Hsun-Ming Chang
- Department of Obstetrics and Gynaecology, BC Children's Hospital Research Institute, University of British Columbia, Vancouver, BC, Canada
| | - Yuyin Yi
- Department of Obstetrics and Gynaecology, BC Children's Hospital Research Institute, University of British Columbia, Vancouver, BC, Canada
| | - Peter C K Leung
- Department of Obstetrics and Gynaecology, BC Children's Hospital Research Institute, University of British Columbia, Vancouver, BC, Canada
| | - Yingpu Sun
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.,Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.,Henan Provincial Obstetrical and Gynecological Diseases (Reproductive Medicine) Clinical Research Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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Hwang K, Yoon JH, Lee JH, Lee S. Recent Advances in Monoclonal Antibody Therapy for Colorectal Cancers. Biomedicines 2021; 9:39. [PMID: 33466394 PMCID: PMC7824816 DOI: 10.3390/biomedicines9010039] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/31/2020] [Accepted: 12/31/2020] [Indexed: 12/12/2022] Open
Abstract
Colorectal cancer (CRC) is one of the leading causes of cancer deaths worldwide. Recent advances in recombinant DNA technology have led to the development of numerous therapeutic antibodies as major sources of blockbuster drugs for CRC therapy. Simultaneously, increasing numbers of therapeutic targets in CRC have been identified. In this review, we first highlight the physiological and pathophysiological roles and signaling mechanisms of currently known and emerging therapeutic targets, including growth factors and their receptors as well as immune checkpoint proteins, in CRC. Additionally, we discuss the current status of monoclonal antibodies in clinical development and approved by US Food and Drug Administration for CRC therapy.
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Affiliation(s)
| | | | | | - Sukmook Lee
- Biopharmaceutical Chemistry Major, School of Applied Chemistry, Kookmin University, Seoul 02707, Korea; (K.H.); (J.H.Y.); (J.H.L.)
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Chen Q, You Y, Zhang Y, Zhang H, Bai L. Hepatocyte growth factor mediates a novel form of hepatic stem/progenitor cell-induced tolerance in a rat xenogeneic liver rejection model. Int Immunopharmacol 2021; 90:107180. [PMID: 33221167 DOI: 10.1016/j.intimp.2020.107180] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/02/2020] [Accepted: 11/02/2020] [Indexed: 12/17/2022]
Abstract
We have previously identified novel neural/glial antigen 2-expressing hepatic stem/progenitor cells (NG2+ HSPs) that are beneficial for tissue repair by inhibiting the immune cell response. In this in vivo study, we investigated the use of hepatocyte growth factor (HGF)-secreting NG2+ HSPs as a tolerogen in the well-established Syrian golden hamster (SGH) to Lewis (LEW) xenogeneic rat acute liver rejection (ARJ) model. Liver and blood cells were collected for histology and functional analyses using immunofluorescence staining, western blot, ELISA, and TUNEL assays. All recipient rats were randomly divided into 5 groups (n = 14 rats/group) and treated with: (1) ARJ + PBS: (2) ARJ + NG2: tail vein injection of NG2+ HSPs; (3) ARJ + tacrolimus (FK506, oral administration); (4) ARJ + an anti-cMet functional blocking antibody (a-cMet-Ab, I.V) 24 h before the injection of NG2+ HSPs; (5) ARJ + cHGF (clinically used HGF). LEW to LEW syngeneic rats were considered "normal" (n = 14, namely Syn). Significantly prolonged mean survival times (MSTs) and improved graft functions were observed after NG2+ HSP transplantation. An anti-cMet Ab significantly blocked the effect of NG2+ HSPs, suggesting that the effects were likely associated with HGF secreted from NG2+ HSPs. Notably, when intravenously injected into the xenogeneic rat model, the injected cHGF not only prolonged the MST of recipient rats but also increased the number of TUNEL-expressing xenoreactive cytotoxic T lymphocytes (CD8+ T cells). Based on these results, HGF-secreting NG2+ HSPs may specifically target recipient CD8+ T cells by inducing their apoptosis.
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Affiliation(s)
- Quanyu Chen
- Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, Laboratory of Molecular Developmental Biology, School of Life Sciences, Southwest University, Beibei, 400715 Chongqing, China; Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No. 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China
| | - Yu You
- Department of Hepatobiliary Surgery, Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China
| | - Yujun Zhang
- Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No. 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China
| | - Hongyu Zhang
- Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No. 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China.
| | - Lianhua Bai
- Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, Laboratory of Molecular Developmental Biology, School of Life Sciences, Southwest University, Beibei, 400715 Chongqing, China; Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No. 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China.
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6
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Nan X, Li HJ, Fang SB, Li QY, Wu YC. Structure-based discovery of novel 4-(2-fluorophenoxy)quinoline derivatives as c-Met inhibitors using isocyanide-involved multicomponent reactions. Eur J Med Chem 2020; 193:112241. [DOI: 10.1016/j.ejmech.2020.112241] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/01/2020] [Accepted: 03/13/2020] [Indexed: 11/29/2022]
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7
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MET targeting: time for a rematch. Oncogene 2020; 39:2845-2862. [PMID: 32034310 DOI: 10.1038/s41388-020-1193-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 01/16/2020] [Accepted: 01/24/2020] [Indexed: 12/21/2022]
Abstract
MET, the receptor tyrosine kinase (RTK) for hepatocyte growth factor, is a proto-oncogene involved in embryonic development and throughout life in homeostasis and tissue regeneration. Deregulation of MET signaling has been reported in numerous malignancies, prompting great interest in MET targeting for cancer therapy. The present review offers a summary of the biology of MET and its known functions in normal physiology and carcinogenesis, followed by an overview of the most relevant MET-targeting strategies and corresponding clinical trials, highlighting both past setbacks and promising future prospects. By placing their efforts on a more precise stratification strategy through the genetic analysis of tumors, modern trials such as the NCI-MATCH trial could revive the past enthusiasm for MET-targeted therapy.
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Yin Y, Guo J, Teng F, Yu L, Jiang Y, Xie K, Jiang M, Fang J. Preparation of a Novel One-Armed Anti-c-Met Antibody with Antitumor Activity Against Hepatocellular Carcinoma. DRUG DESIGN DEVELOPMENT AND THERAPY 2019; 13:4173-4184. [PMID: 31849449 PMCID: PMC6911325 DOI: 10.2147/dddt.s224491] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 11/07/2019] [Indexed: 12/19/2022]
Abstract
Introduction Antibody-based c-mesenchymal–epithelial transition factor (c-Met) inhibition is a promising strategy for hepatocellular carcinoma (HCC) treatment, but the intrinsic agonistic activity of the anti-c-Met antibody limits its application in drug development. Constructing a monovalent one-armed antibody has been reported to be an effective way to create an inhibitory anti-c-Met antibody. Materials and methods In the present study, a novel monovalent one-armed anti-c-Met antibody was constructed using the knobs-into-holes technology, and its inhibitory effects against HCC and the underlying mechanisms were explored. Results The one-armed anti-c-Met antibody blocked the hepatocyte growth factor (HGF)/c-Met interaction and the subsequent signal transduction, including phosphorylation of c-Met, Grb2-associated binding protein 1(Gab-1), extracellular regulated protein kinases 1/2(Erk1/2), and Akt, also referred to as protein kinase B (PKB) in HCC cell line HepG2. Furthermore, the autocrine stimulation of HepG2 cell proliferation and HGF-induced HCC cell migration were strongly inhibited by the one-armed anti-c-Met antibody. In addition, the antibody also reduced the HGF-induced proliferation and tube formation of human umbilical vein endothelial cells (HUVECs). Treating HepG2-bearing mice with the one-armed anti-c-Met antibody significantly inhibited the tumor growth in the xenograft nude mouse model. Conclusion The one-armed anti-c-Met antibody derived from the full-length bivalent anti-c-Met antibody might serve as a potential antitumor agent against HCC.
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Affiliation(s)
- Yanxin Yin
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, People's Republic of China.,Biomedical Research Center, Tongji University Suzhou Institute, Suzhou, Jiangsu 215101, People's Republic of China
| | - Jia Guo
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, People's Republic of China.,Biomedical Research Center, Tongji University Suzhou Institute, Suzhou, Jiangsu 215101, People's Republic of China
| | - Fei Teng
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, People's Republic of China.,Biomedical Research Center, Tongji University Suzhou Institute, Suzhou, Jiangsu 215101, People's Republic of China
| | - Lihua Yu
- Biomedical Research Center, Tongji University Suzhou Institute, Suzhou, Jiangsu 215101, People's Republic of China
| | - Yun Jiang
- Biomedical Research Center, Tongji University Suzhou Institute, Suzhou, Jiangsu 215101, People's Republic of China
| | - Kun Xie
- School of Life Science and Technology, Tongji University, Shanghai 200092, People's Republic of China
| | - Ming Jiang
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, People's Republic of China.,Biomedical Research Center, Tongji University Suzhou Institute, Suzhou, Jiangsu 215101, People's Republic of China
| | - Jianmin Fang
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, People's Republic of China.,Biomedical Research Center, Tongji University Suzhou Institute, Suzhou, Jiangsu 215101, People's Republic of China.,School of Life Science and Technology, Tongji University, Shanghai 200092, People's Republic of China
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Lv PC, Yang YS, Wang ZC. Recent Progress in the Development of Small Molecule c-Met Inhibitors. Curr Top Med Chem 2019; 19:1276-1288. [PMID: 31526339 DOI: 10.2174/1568026619666190712205353] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 06/24/2019] [Accepted: 06/28/2019] [Indexed: 02/08/2023]
Abstract
C-Met, also referred to as Hepatocyte Growth Factor Receptor (HGFR), is a heterodimeric
receptor tyrosine kinase. It has been determined that c-Met gene mutations, overexpression, and amplification
also occur in a variety of human tumor types, and these events are closely related to the aberrant
activation of the HGF/c-Met signaling pathway. Meanwhile, high c-Met expression is closely associated
with poor prognosis in cancer patients. The c-Met kinase has emerged as an attractive target for developing
antitumor agents. In this review, we cover the recent advances on the small molecule c-Met inhibitors
discovered from 2018 until now, with a main focus on the rational design, synthesis and structureactivity
relationship analysis.
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Affiliation(s)
- Peng-Cheng Lv
- Department of Chemistry, Purdue University, West Lafayette, Indiana, IN 47907, United States
| | - Yu-Shun Yang
- Department of Chemistry, Purdue University, West Lafayette, Indiana, IN 47907, United States
| | - Zhong-Chang Wang
- Department of Chemistry, Purdue University, West Lafayette, Indiana, IN 47907, United States
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10
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Design, synthesis and evaluation of sulfonylurea-containing 4-phenoxyquinolines as highly selective c-Met kinase inhibitors. Bioorg Med Chem 2019; 27:2801-2812. [DOI: 10.1016/j.bmc.2019.05.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 04/26/2019] [Accepted: 05/04/2019] [Indexed: 12/20/2022]
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van der Heijden M, Vermeulen L. Stem cells in homeostasis and cancer of the gut. Mol Cancer 2019; 18:66. [PMID: 30927915 PMCID: PMC6441158 DOI: 10.1186/s12943-019-0962-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 02/20/2019] [Indexed: 12/14/2022] Open
Abstract
The intestinal epithelial lining is one of the most rapidly renewing cell populations in the body. As a result, the gut has been an attractive model to resolve key mechanisms in epithelial homeostasis. In particular the role of intestinal stem cells (ISCs) in the renewal process has been intensely studied. Interestingly, as opposed to the traditional stem cell theory, the ISC is not a static population but displays significant plasticity and in situations of tissue regeneration more differentiated cells can revert back to a stem cell state upon exposure to extracellular signals. Importantly, normal intestinal homeostasis provides important insight into mechanisms that drive colorectal cancer (CRC) development and growth. Specifically, the dynamics of cancer stem cells bear important resemblance to ISC functionality. In this review we present an overview of the current knowledge on ISCs in homeostasis and their role in malignant transformation. Also, we discuss the existence of stem cells in intestinal adenomas and CRC and how these cells contribute to (pre-)malignant growth. Furthermore, we will focus on new paradigms in the field of dynamical cellular hierarchies in CRC and the intimate relationship between tumor cells and their niche.
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Affiliation(s)
- Maartje van der Heijden
- Amsterdam UMC, University of Amsterdam, Laboratory for Experimental Oncology and Radiobiology, Center for Experimental and Molecular Medicine, Cancer Center Amsterdam and Amsterdam Gastroenterology and Metabolism, Meibergdreef 9, 1105, Amsterdam, AZ, Netherlands
| | - Louis Vermeulen
- Amsterdam UMC, University of Amsterdam, Laboratory for Experimental Oncology and Radiobiology, Center for Experimental and Molecular Medicine, Cancer Center Amsterdam and Amsterdam Gastroenterology and Metabolism, Meibergdreef 9, 1105, Amsterdam, AZ, Netherlands.
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Kissel M, Berndt S, Fiebig L, Kling S, Ji Q, Gu Q, Lang T, Hafner FT, Teufel M, Zopf D. Antitumor effects of regorafenib and sorafenib in preclinical models of hepatocellular carcinoma. Oncotarget 2017; 8:107096-107108. [PMID: 29291014 PMCID: PMC5739799 DOI: 10.18632/oncotarget.22334] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 09/20/2017] [Indexed: 12/21/2022] Open
Abstract
The purpose of this study was to investigate the antitumor activity of regorafenib and sorafenib in preclinical models of HCC and to assess their mechanism of action by associated changes in protein expression in a HCC-PDX mouse model. Both drugs were administered orally once daily at 10 mg/kg (regorafenib) or 30 mg/kg (sorafenib), which recapitulate the human exposure at the maximally tolerated dose in mice. In a H129 hepatoma model, survival times differed significantly between regorafenib versus vehicle (p=0.0269; median survival times 36 vs 27 days), but not between sorafenib versus vehicle (p=0.1961; 33 vs 28 days). Effects on tumor growth were assessed in 10 patient-derived HCC xenograft (HCC-PDX) models. Significant tumor growth inhibition was observed in 8/10 models with regorafenib and 7/10 with sorafenib; in four models, superior response was observed with regorafenib versus sorafenib which was deemed not to be due to lower sorafenib exposure. Bead-based multiplex western blot analysis was performed with total protein lysates from drug- and vehicle-treated HCC-PDX xenografts. Protein expression was substantially different in regorafenib- and sorafenib-treated samples compared with vehicle. The pattern of upregulated proteins was similar with both drugs and indicates an activated RAF/MEK/ERK pathway, but more proteins were downregulated with sorafenib versus regorafenib. Overall, both regorafenib and sorafenib were effective in mouse models of HCC, although several cases showed better regorafenib activity which may explain the observed efficacy of regorafenib in sorafenib-refractory patients.
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Affiliation(s)
| | | | | | - Simon Kling
- Biochemistry, NMI Natural and Medicinal Sciences Institute, University of Tübingen, Reutlingen, Germany
| | - Qunsheng Ji
- Research Service Division, Oncology & Immunology Unit, WuXi AppTec Co. Ltd., Shanghai, China
| | - Qingyang Gu
- Research Service Division, Oncology & Immunology Unit, WuXi AppTec Co. Ltd., Shanghai, China
| | - Tina Lang
- Research & Clinical Sciences Statistics, Bayer AG, Berlin, Germany
| | | | - Michael Teufel
- Translational Medicine Oncology, Bayer HealthCare Pharmaceuticals, Whippany, NJ, USA
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Poulsen TT, Grandal MM, Skartved NJØ, Hald R, Alifrangis L, Koefoed K, Lindsted T, Fröhlich C, Pollmann SE, Eriksen KW, Dahlman A, Jacobsen HJ, Bouquin T, Pedersen MW, Horak ID, Lantto J, Kragh M. Sym015: A Highly Efficacious Antibody Mixture against MET-Amplified Tumors. Clin Cancer Res 2017; 23:5923-5935. [PMID: 28679766 DOI: 10.1158/1078-0432.ccr-17-0782] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 06/01/2017] [Accepted: 06/29/2017] [Indexed: 02/03/2023]
Abstract
Purpose: Activation of the receptor tyrosine kinase MET is associated with poor clinical outcome in certain cancers. To target MET more effectively, we developed an antagonistic antibody mixture, Sym015, consisting of two humanized mAbs directed against nonoverlapping epitopes of MET.Experimental Design/Results: We screened a large panel of well-annotated human cancer cell lines and identified a subset with highly elevated MET expression. In particular, cell lines of lung cancer and gastric cancer origin demonstrated high MET expression and activation, and Sym015 triggered degradation of MET and significantly inhibited growth of these cell lines. Next, we tested Sym015 in patient- and cell line-derived xenograft models with high MET expression and/or MET exon 14 skipping alterations, and in models harboring MET amplification as a mechanism of resistance to EGFR-targeting agents. Sym015 effectively inhibited tumor growth in all these models and was superior to an analogue of emibetuzumab, a monoclonal IgG4 antibody against MET currently in clinical development. Sym015 also induced antibody-dependent cellular cytotoxicity (ADCC) in vitro, suggesting that secondary effector functions contribute to the efficacy of Sym015.Retrospectively, all responsive, high MET-expressing models were scored as highly MET-amplified by in situ hybridization, pointing to MET amplification as a predictive biomarker for efficacy. Preclinical toxicology studies in monkeys showed that Sym015 was well tolerated, with a pharmacokinetic profile supporting administration of Sym015 every second or third week in humans.Conclusions: The preclinical efficacy and safety data provide a clear rationale for the ongoing clinical studies of Sym015 in patients with MET-amplified tumors. Clin Cancer Res; 23(19); 5923-35. ©2017 AACR.
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Safaie Qamsari E, Safaei Ghaderi S, Zarei B, Dorostkar R, Bagheri S, Jadidi-Niaragh F, Somi MH, Yousefi M. The c-Met receptor: Implication for targeted therapies in colorectal cancer. Tumour Biol 2017; 39:1010428317699118. [DOI: 10.1177/1010428317699118] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
c-Met (mesenchymal–epithelial transition factor) is a tyrosine kinase receptor activated by hepatocyte growth factor and regulates multiple biological processes, such as cell scattering, survival, and proliferation. Aberrant c-Met signaling has been implicated in a variety of cancer types, including colorectal cancer. c-Met is genetically altered through various mechanisms that is associated with colorectal cancer progression and metastasis. Especially, in colorectal cancer, preclinical evidence for the aberrant activation of the c-Met signaling exists. Accordingly, molecular targeting of c-Met receptor could be a promising strategy, in the treatment of colorectal cancer patients. Recently, it was also shown that crosstalk between c-Met and other cell surface receptors attributes to tumorigenesis and development of therapeutic resistance. Characterization of the molecular mechanisms through which c-Met crosstalks with other receptors in favor of tumor formation and progression remains to explore. This review will describe the mechanisms of aberrant c-Met signaling in colorectal cancer and discuss on additional roles for c-Met receptor through crosstalk with other tyrosine kinase receptors and cell surface proteins in colorectal cancer. Novel therapeutic approaches for c-Met pathway targeting will also be discussed.
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Affiliation(s)
- Elmira Safaie Qamsari
- Stem Cell and Regenerative Medicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sepideh Safaei Ghaderi
- Department of Biotechnology, Faculty of Advanced Science & Technology, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran, Iran
- Hybridoma Laboratory, Immunology Department, Pasteur Institute of Iran, Tehran, Iran
| | - Bahareh Zarei
- Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Ruhollah Dorostkar
- Applied Virology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Salman Bagheri
- Stem Cell and Regenerative Medicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Farhad Jadidi-Niaragh
- Stem Cell and Regenerative Medicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Hossein Somi
- Liver and Gastrointestinal Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mehdi Yousefi
- Liver and Gastrointestinal Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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Wang X, Jiang N, Zhao S, Xi S, Wang J, Jing T, Zhang W, Guo M, Gong P, Zhai X. Design, synthesis and biological evaluation of novel 4-(2-fluorophenoxy)quinoline derivatives as selective c-Met inhibitors. Bioorg Med Chem 2017; 25:886-896. [DOI: 10.1016/j.bmc.2016.12.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 12/02/2016] [Indexed: 11/29/2022]
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16
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Qamsari ES, Sharifzadeh Z, Bagheri S, Riazi-Rad F, Younesi V, Abolhassani M, Ghaderi SS, Baradaran B, Somi MH, Yousefi M. Isolation and characterization of anti c-met single chain fragment variable (scFv) antibodies. J Immunotoxicol 2017; 14:23-30. [PMID: 28090795 DOI: 10.1080/1547691x.2016.1251512] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The receptor tyrosine kinase (RTK) Met is the cell surface receptor for hepatocyte growth factor (HGF) involved in invasive growth programs during embryogenesis and tumorgenesis. There is compelling evidence suggesting important roles for c-Met in colorectal cancer proliferation, migration, invasion, angiogenesis, and survival. Hence, a molecular inhibitor of an extracellular domain of c-Met receptor that blocks c-Met-cell surface interactions could be of great thera-peutic importance. In an attempt to develop molecular inhibitors of c-Met, single chain variable fragment (scFv) phage display libraries Tomlinson I + J against a specific synthetic oligopeptide from the extracellular domain of c-Met receptor were screened; selected scFv were then characterized using various immune techniques. Three c-Met specific scFv (ES1, ES2, and ES3) were selected following five rounds of panning procedures. The scFv showed specific binding to c-Met receptor, and significantly inhibited proliferation responses of a human colorectal carcinoma cell line (HCT-116). Moreover, anti- apoptotic effects of selected scFv antibodies on the HCT-116 cell line were also evaluated using Annexin V/PI assays. The results demonstrated rates of apoptotic cell death of 46.0, 25.5, and 37.8% among these cells were induced by use of ES1, ES2, and ES3, respectively. The results demonstrated ability to successfully isolate/char-acterize specific c-Met scFv that could ultimately have a great therapeutic potential in immuno-therapies against (colorectal) cancers.
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Affiliation(s)
- Elmira Safaie Qamsari
- a Immunology Research Center , Tabriz University of Medical Sciences , Tabriz , Iran.,b Department of Immunology , Tabriz University of Medical Sciences , Tabriz , Iran.,c Immunology Department, Hybridoma Laboratory , Pasteur Institute of Iran , Tehran , Iran
| | - Zahra Sharifzadeh
- c Immunology Department, Hybridoma Laboratory , Pasteur Institute of Iran , Tehran , Iran
| | - Salman Bagheri
- a Immunology Research Center , Tabriz University of Medical Sciences , Tabriz , Iran.,b Department of Immunology , Tabriz University of Medical Sciences , Tabriz , Iran.,c Immunology Department, Hybridoma Laboratory , Pasteur Institute of Iran , Tehran , Iran
| | - Farhad Riazi-Rad
- d Department of Immunology , Pasteur Institute of Iran , Tehran , Iran
| | - Vahid Younesi
- e Monoclonal Anti-body Research Center , Avicenna Research Institute , Tehran , Iran
| | - Mohsen Abolhassani
- c Immunology Department, Hybridoma Laboratory , Pasteur Institute of Iran , Tehran , Iran
| | - Sepideh Safaei Ghaderi
- f Department of Biotechnology, Pharmaceutical Sciences Branch , Islamic Azad University , Tehran , Iran
| | - Behzad Baradaran
- a Immunology Research Center , Tabriz University of Medical Sciences , Tabriz , Iran
| | - Mohammad Hossein Somi
- g Liver and Gastrointestinal Diseases Research Center , Tabriz University of Medical Sciences , Tabriz , Iran
| | - Mehdi Yousefi
- g Liver and Gastrointestinal Diseases Research Center , Tabriz University of Medical Sciences , Tabriz , Iran
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17
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Wnt Signaling in Cancer Stem Cell Biology. Cancers (Basel) 2016; 8:cancers8070060. [PMID: 27355964 PMCID: PMC4963802 DOI: 10.3390/cancers8070060] [Citation(s) in RCA: 164] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 06/11/2016] [Accepted: 06/20/2016] [Indexed: 12/21/2022] Open
Abstract
Aberrant regulation of Wnt signaling is a common theme seen across many tumor types. Decades of research have unraveled the epigenetic and genetic alterations that result in elevated Wnt pathway activity. More recently, it has become apparent that Wnt signaling levels identify stem-like tumor cells that are responsible for fueling tumor growth. As therapeutic targeting of these tumor stem cells is an intense area of investigation, a concise understanding on how Wnt activity relates to cancer stem cell traits is needed. This review attempts at summarizing the intricacies between Wnt signaling and cancer stem cell biology with a special emphasis on colorectal cancer.
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18
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Rogers MA, Kalter V, Marcias G, Zapatka M, Barbus S, Lichter P. CITED4 gene silencing in colorectal cancer cells modulates adherens/tight junction gene expression and reduces cell proliferation. J Cancer Res Clin Oncol 2015; 142:225-37. [PMID: 26243458 PMCID: PMC4705123 DOI: 10.1007/s00432-015-2011-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 06/27/2015] [Indexed: 12/25/2022]
Abstract
Purpose CITED4 is one member of a family of transcriptional cofactors, several of which are deregulated in a variety of tumors, including colorectal cancer (CRC). We modulated CITED4 expression, in vitro, and analyzed the associated phenotypic and gene expression changes. Methods CITED4-overexpressing and shRNA-mediated knockdown cell lines and control cell lines were established in the CRC cell line SW480. The cells were analyzed for changes in proliferation, apoptosis/cell cycle, migration, invasion, colony formation and adhesion. mRNA expression changes were determined by microarray and pathway analysis, and several deregulated genes were validated by qRT-PCR and Western blotting. Based on results obtained from these studies, the status of the actin cytoskeleton was evaluated by phalloidin/vinculin staining. Results Phenotypically, the CITED4-overexpressing cell line showed only moderate changes in adhesion. Microarray analysis identified several deregulated genes, including several G protein-coupled receptors. Phenotypic analysis of the CITED4 shRNA knockdown cell line demonstrated decreased cell proliferation and G2 cell cycle blockage. Microarray analysis identified many deregulated genes, and pathway analysis discovered genes linked to actin-associated adherens junctions/tight junctions (claudin-4, claudin-7, ezrin, MET, ß-catenin). Phenotypically, no morphological changes of the actin cytoskeleton were seen. Conclusions Upregulation of CITED4 in SW480 resulted in no obvious phenotype. CITED4 shRNA-mediated knockdown led to decreased cellular proliferation and modulation of a large number of genes, including the c-MET tyrosine kinase and several actin-associated adherens junctions/tight junction genes. Electronic supplementary material The online version of this article (doi:10.1007/s00432-015-2011-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Michael A Rogers
- Division of Molecular Genetics (B060), German Cancer Research Center, Im Neuenheimer Feld 580, 69120, Heidelberg, Germany
| | - Verena Kalter
- Division of Molecular Genetics (B060), German Cancer Research Center, Im Neuenheimer Feld 580, 69120, Heidelberg, Germany
| | - Gemma Marcias
- Division of Molecular Genetics (B060), German Cancer Research Center, Im Neuenheimer Feld 580, 69120, Heidelberg, Germany
| | - Marc Zapatka
- Division of Molecular Genetics (B060), German Cancer Research Center, Im Neuenheimer Feld 580, 69120, Heidelberg, Germany
| | - Sebastian Barbus
- Division of Molecular Genetics (B060), German Cancer Research Center, Im Neuenheimer Feld 580, 69120, Heidelberg, Germany
| | - Peter Lichter
- Division of Molecular Genetics (B060), German Cancer Research Center, Im Neuenheimer Feld 580, 69120, Heidelberg, Germany.
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Hayes GM, Cairns B, Levashova Z, Chinn L, Perez M, Theunissen JW, Liao-Chan S, Bermudez A, Flory MR, Schweighofer KJ, H van der Horst E. CD39 is a promising therapeutic antibody target for the treatment of soft tissue sarcoma. Am J Transl Res 2015; 7:1181-1188. [PMID: 26279761 PMCID: PMC4532750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 06/14/2015] [Indexed: 06/04/2023]
Abstract
Soft tissue sarcoma (STS) is a heterogenous tumor arising from the embryonic mesoderm represented by approximately 50 histological subtypes. Effective therapeutic intervention is lacking for recurrent, late stage and metastatic disease. CD39, a cell-surface ectonucleotidase, has previously been shown to be upregulated in hematological malignancies and various epithelial tumors, but not in STS. Here, we show by mass spectrometry and immunohistochemistry that CD39 is highly expressed in primary patient sarcoma samples. Moreover, CD39 nucleotidase activity is enhanced in fibrosarcoma compared with normal control cells. We demonstrate that an inhibitory monoclonal anti-CD39 antibody, abrogates CD39 enzymatic activity significantly and prolongs survival in a lethal metastatic patient-derived sarcoma model. Taken together, the data suggest CD39 is a novel therapeutic target for the treatment of STS.
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Affiliation(s)
- Gregory M Hayes
- Preclinical Development, Igenica Biotherapeutics Inc.CA, USA
| | - Belinda Cairns
- Preclinical Development, Igenica Biotherapeutics Inc.CA, USA
| | - Zoia Levashova
- Preclinical Development, Igenica Biotherapeutics Inc.CA, USA
| | - Lawrence Chinn
- Preclinical Development, Igenica Biotherapeutics Inc.CA, USA
| | - Myra Perez
- Preclinical Development, Igenica Biotherapeutics Inc.CA, USA
| | | | | | - Abel Bermudez
- Discovery Research, Igenica Biotherapeutics Inc.CA, USA
| | - Mark R Flory
- Discovery Research, Igenica Biotherapeutics Inc.CA, USA
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20
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Kim SY, Theunissen JW, Balibalos J, Liao-Chan S, Babcock MC, Wong T, Cairns B, Gonzalez D, van der Horst EH, Perez M, Levashova Z, Chinn L, D'Alessio JA, Flory M, Bermudez A, Jackson DY, Ha E, Monteon J, Bruhns MF, Chen G, Migone TS. A novel antibody-drug conjugate targeting SAIL for the treatment of hematologic malignancies. Blood Cancer J 2015; 5:e316. [PMID: 26024286 PMCID: PMC4476018 DOI: 10.1038/bcj.2015.39] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 04/17/2015] [Indexed: 01/21/2023] Open
Abstract
Although several new therapeutic approaches have improved outcomes in the treatment of hematologic malignancies, unmet need persists in acute myeloid leukemia (AML), multiple myeloma (MM) and non-Hodgkin's lymphoma. Here we describe the proteomic identification of a novel cancer target, SAIL (Surface Antigen In Leukemia), whose expression is observed in AML, MM, chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL) and follicular lymphoma (FL). While SAIL is widely expressed in CLL, AML, MM, DLBCL and FL patient samples, expression in cancer cell lines is mostly limited to cells of AML origin. We evaluated the antitumor activity of anti-SAIL monoclonal antibodies, 7-1C and 67-7A, conjugated to monomethyl auristatin F. Following internalization, anti-SAIL antibody–drug conjugates (ADCs) exhibited subnanomolar IC50 values against AML cell lines in vitro. In pharmacology studies employing AML cell line xenografts, anti-SAIL ADCs resulted in significant tumor growth inhibition. The restricted expression profile of this target in normal tissues, the high prevalence in different types of hematologic cancers and the observed preclinical activity support the clinical development of SAIL-targeted ADCs.
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Affiliation(s)
- S Y Kim
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - J-W Theunissen
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - J Balibalos
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - S Liao-Chan
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - M C Babcock
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - T Wong
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - B Cairns
- Department of Preclinical Development, Igenica Biotherapeutics, Burlingame, CA, USA
| | - D Gonzalez
- Department of Preclinical Development, Igenica Biotherapeutics, Burlingame, CA, USA
| | - E H van der Horst
- Department of Preclinical Development, Igenica Biotherapeutics, Burlingame, CA, USA
| | - M Perez
- Department of Preclinical Development, Igenica Biotherapeutics, Burlingame, CA, USA
| | - Z Levashova
- Department of Preclinical Development, Igenica Biotherapeutics, Burlingame, CA, USA
| | - L Chinn
- Department of Preclinical Development, Igenica Biotherapeutics, Burlingame, CA, USA
| | - J A D'Alessio
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - M Flory
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - A Bermudez
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - D Y Jackson
- Department of Chemistry, Igenica Biotherapeutics, Burlingame, CA, USA
| | - E Ha
- Department of Chemistry, Igenica Biotherapeutics, Burlingame, CA, USA
| | - J Monteon
- Department of Process Development, Igenica Biotherapeutics, Burlingame, CA, USA
| | - M F Bruhns
- Department of Process Development, Igenica Biotherapeutics, Burlingame, CA, USA
| | - G Chen
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
| | - T-S Migone
- Department of Biology, Igenica Biotherapeutics, Burlingame, CA, USA
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21
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Liao-Chan S, Daine-Matsuoka B, Heald N, Wong T, Lin T, Cai AG, Lai M, D’Alessio JA, Theunissen JW. Quantitative assessment of antibody internalization with novel monoclonal antibodies against Alexa fluorophores. PLoS One 2015; 10:e0124708. [PMID: 25894652 PMCID: PMC4403856 DOI: 10.1371/journal.pone.0124708] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 03/04/2015] [Indexed: 12/31/2022] Open
Abstract
Antibodies against cell surface antigens may be internalized through their specific interactions with these proteins and in some cases may induce or perturb antigen internalization. The anti-cancer efficacy of antibody-drug conjugates is thought to rely on their uptake by cancer cells expressing the surface antigen. Numerous techniques, including microscopy and flow cytometry, have been used to identify antibodies with desired cellular uptake rates. To enable quantitative measurements of internalization of labeled antibodies, an assay based on internalized and quenched fluorescence was developed. For this approach, we generated novel anti-Alexa Fluor monoclonal antibodies (mAbs) that effectively and specifically quench cell surface-bound Alexa Fluor 488 or Alexa Fluor 594 fluorescence. Utilizing Alexa Fluor-labeled mAbs against the EphA2 receptor tyrosine kinase, we showed that the anti-Alexa Fluor reagents could be used to monitor internalization quantitatively over time. The anti-Alexa Fluor mAbs were also validated in a proof of concept dual-label internalization assay with simultaneous exposure of cells to two different mAbs. Importantly, the unique anti-Alexa Fluor mAbs described here may also enable other single- and dual-label experiments, including label detection and signal enhancement in macromolecules, trafficking of proteins and microorganisms, and cell migration and morphology.
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Affiliation(s)
- Sindy Liao-Chan
- Department of Discovery Research, Igenica Biotherapeutics, Burlingame, California, United States of America
| | - Barbara Daine-Matsuoka
- Department of Discovery Research, Igenica Biotherapeutics, Burlingame, California, United States of America
| | - Nathan Heald
- Department of Discovery Research, Igenica Biotherapeutics, Burlingame, California, United States of America
| | - Tiffany Wong
- Department of Discovery Research, Igenica Biotherapeutics, Burlingame, California, United States of America
| | - Tracey Lin
- Department of Discovery Research, Igenica Biotherapeutics, Burlingame, California, United States of America
| | - Allen G. Cai
- Department of Discovery Research, Igenica Biotherapeutics, Burlingame, California, United States of America
| | - Michelle Lai
- Department of Discovery Research, Igenica Biotherapeutics, Burlingame, California, United States of America
| | - Joseph A. D’Alessio
- Department of Discovery Research, Igenica Biotherapeutics, Burlingame, California, United States of America
| | - Jan-Willem Theunissen
- Department of Discovery Research, Igenica Biotherapeutics, Burlingame, California, United States of America
- * E-mail:
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22
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Hayes GM, Chinn L, Cantor JM, Cairns B, Levashova Z, Tran H, Velilla T, Duey D, Lippincott J, Zachwieja J, Ginsberg MH, H van der Horst E. Antitumor activity of an anti-CD98 antibody. Int J Cancer 2015; 137:710-20. [PMID: 25556716 PMCID: PMC6680144 DOI: 10.1002/ijc.29415] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 12/18/2014] [Indexed: 12/31/2022]
Abstract
CD98 is expressed on several tissue types and specifically upregulated on fast-cycling cells undergoing clonal expansion. Various solid (e.g., nonsmall cell lung carcinoma) as well as hematological malignancies (e.g., acute myeloid leukemia) overexpress CD98. We have identified a CD98-specific mouse monoclonal antibody that exhibits potent preclinical antitumor activity against established lymphoma tumor xenografts. Additionally, the humanized antibody designated IGN523 demonstrated robust tumor growth inhibition in leukemic cell-line derived xenograft models and was as efficacious as standard of care carboplatin in patient-derived nonsmall lung cancer xenografts. In vitro studies revealed that IGN523 elicited strong ADCC activity, induced lysosomal membrane permeabilization and inhibited essential amino acid transport function, ultimately resulting in caspase-3 and -7-mediated apoptosis of tumor cells. IGN523 is currently being evaluated in a Phase I clinical trial for acute myeloid leukemia (NCT02040506). Furthermore, preclinical data support the therapeutic potential of IGN523 in solid tumors.
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Affiliation(s)
| | | | - Joseph M Cantor
- School of Medicine, University of California-San Diego, La Jolla, CA
| | | | | | - Hoang Tran
- Pre-Clinical Development, Igenica Biotherapeutics, CA
| | | | - Dana Duey
- Pre-Clinical Development, Igenica Biotherapeutics, CA
| | | | | | - Mark H Ginsberg
- School of Medicine, University of California-San Diego, La Jolla, CA
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Abstract
Antibody drugs have become an increasingly significant component of the therapeutic landscape. Their success has been driven by some of their unique properties, in particular their very high specificity and selectivity, in contrast to the off-target liabilities of small molecules (SMs). Antibodies can bring additional functionality to the table with their ability to interact with the immune system, and this can be further manipulated with advances in antibody engineering. This review summarizes what antibody therapeutics have achieved to date and what opportunities and challenges lie ahead. The target landscape for large molecules (LMs) versus SMs and some of the challenges for antibody drug development are discussed. Effective penetration of membrane barriers and intracellular targeting is one challenge, particularly across the highly resistant blood-brain barrier. The expanding pipeline of antibody-drug conjugates offers the potential to combine SM and LM modalities in a variety of creative ways, and antibodies also offer exciting potential to build bi- and multispecific molecules. The ability to pursue more challenging targets can also be further exploited but highlights the need for earlier screening in functional cell-based assays. I discuss how this might be addressed given the practical constraints imposed by high-throughput screening sample type and process differences in antibody primary screening.
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Affiliation(s)
- Alison J. Smith
- Department of Antibody Discovery and Protein Engineering, MedImmune Ltd, Cambridge, UK
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24
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Prat M, Oltolina F, Basilico C. Monoclonal Antibodies against the MET/HGF Receptor and Its Ligand: Multitask Tools with Applications from Basic Research to Therapy. Biomedicines 2014; 2:359-383. [PMID: 28548076 PMCID: PMC5344273 DOI: 10.3390/biomedicines2040359] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 11/21/2014] [Accepted: 11/24/2014] [Indexed: 12/19/2022] Open
Abstract
Monoclonal antibodies can be seen as valuable tools for many aspects of basic as well as applied sciences. In the case of MET/HGFR, they allowed the identification of truncated isoforms of the receptor, as well as the dissection of different epitopes, establishing structure-function relationships. Antibodies directed against MET extracellular domain were found to be full or partial receptor agonists or antagonists. The agonists can mimic the effects of the different isoforms of the natural ligand, but with the advantage of being more stable than the latter. Thus, some agonist antibodies promote all the biological responses triggered by MET activation, including motility, proliferation, morphogenesis, and protection from apoptosis, while others can induce only a migratory response. On the other hand, antagonists can inhibit MET-driven biological functions either by competing with the ligand or by removing the receptor from the cell surface. Since MET/HGFR is often over-expressed and/or aberrantly activated in tumors, monoclonal antibodies can be used as probes for MET detection or as "bullets" to target MET-expressing tumor cells, thus pointing to their use in diagnosis and therapy.
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Affiliation(s)
- Maria Prat
- Department of Health Sciences, Università del Piemonte Orientale, via Solaroli 17, 28100 Novara, Italy.
| | - Francesca Oltolina
- Department of Health Sciences, Università del Piemonte Orientale, via Solaroli 17, 28100 Novara, Italy.
| | - Cristina Basilico
- Laboratory of Exploratory Research, Candiolo Cancer Institute, Str. Prov. 142, 10060 Candiolo, Italy.
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25
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Hagemann UB, Gunnarsson L, Géraudie S, Scheffler U, Griep RA, Reiersen H, Duncan AR, Kiprijanov SM. Fully human antagonistic antibodies against CCR4 potently inhibit cell signaling and chemotaxis. PLoS One 2014; 9:e103776. [PMID: 25080123 PMCID: PMC4117600 DOI: 10.1371/journal.pone.0103776] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Accepted: 06/30/2014] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND CC chemokine receptor 4 (CCR4) represents a potentially important target for cancer immunotherapy due to its expression on tumor infiltrating immune cells including regulatory T cells (Tregs) and on tumor cells in several cancer types and its role in metastasis. METHODOLOGY Using phage display, human antibody library, affinity maturation and a cell-based antibody selection strategy, the antibody variants against human CCR4 were generated. These antibodies effectively competed with ligand binding, were able to block ligand-induced signaling and cell migration, and demonstrated efficient killing of CCR4-positive tumor cells via ADCC and phagocytosis. In a mouse model of human T-cell lymphoma, significant survival benefit was demonstrated for animals treated with the newly selected anti-CCR4 antibodies. SIGNIFICANCE For the first time, successful generation of anti- G-protein coupled chemokine receptor (GPCR) antibodies using human non-immune library and phage display on GPCR-expressing cells was demonstrated. The generated anti-CCR4 antibodies possess a dual mode of action (inhibition of ligand-induced signaling and antibody-directed tumor cell killing). The data demonstrate that the anti-tumor activity in vivo is mediated, at least in part, through Fc-receptor dependent effector mechanisms, such as ADCC and phagocytosis. Anti-CC chemokine receptor 4 antibodies inhibiting receptor signaling have potential as immunomodulatory antibodies for cancer.
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26
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Vigna E, Comoglio PM. Targeting the oncogenic Met receptor by antibodies and gene therapy. Oncogene 2014; 34:1883-9. [PMID: 24882574 DOI: 10.1038/onc.2014.142] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 04/22/2014] [Accepted: 04/22/2014] [Indexed: 12/31/2022]
Abstract
The receptor for hepatocyte growth factor (HGF), a tyrosine kinase encoded by the Met oncogene, has a crucial role in cancer growth, invasion and metastasis. It is a validated therapeutic target for 'personalized' treatment of a number of malignancies. Therapeutic tools prompting selective, robust and highly effective Met inhibition potentially represent a major step in the battle against cancer. Antibodies targeting either Met or its ligand HGF, although challenging, demonstrate to be endowed with promising features. Here we briefly review and discuss the state of the art in the field.
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Affiliation(s)
- E Vigna
- University of Torino, Department of Oncology, and Candiolo Cancer Institute, FPO-IRCCS, Candiolo (TO), Italy
| | - P M Comoglio
- University of Torino, Department of Oncology, and Candiolo Cancer Institute, FPO-IRCCS, Candiolo (TO), Italy
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27
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Wong JS, Warbrick E, Vojtesk B, Hill J, Lane DP. Anti-c-Met antibodies recognising a temperature sensitive epitope, inhibit cell growth. Oncotarget 2014; 4:1019-36. [PMID: 23859937 PMCID: PMC3759663 DOI: 10.18632/oncotarget.1075] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
c-Met is a tyrosine receptor kinase which is activated by its ligand, the hepatocyte growth factor. Activation of c-Met leads to a wide spectrum of biological activities such as motility, angiogenesis, morphogenesis, cell survival and cell regeneration. c-Met is abnormally activated in many tumour types. Aberrant c-Met activation was found to induce tumour development, tumour cell migration and invasion, and the worst and final step in cancer progression, metastasis. In addition, c-Met activation in cells was also shown to confer resistance to apoptosis induced by UV damage or chemotherapeutic drugs. This study describes the development of monoclonal antibodies against c-Met as therapeutic molecules in cancer treatment/diagnostics. A panel of c-Met monoclonal antibodies was developed and characterised by epitope mapping, Western blotting, immunoprecipitation, agonist/antagonist effect in cell scatter assays and for their ability to recognise native c-Met by flow cytometry. We refer to these antibodies as Specifically Engaging Extracellular c-Met (seeMet). seeMet 2 and 13 bound strongly to native c-Met in flow cytometry and reduced SNU-5 cell growth. Interestingly, seeMet 2 binding was strongly reduced at 4oC when compared to 37oC. Detail mapping of the seeMet 2 epitope indicated a cryptic binding site hidden within the c-Met α-chain.
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Affiliation(s)
- Julin S Wong
- p53 Laboratory, 8A Biomedical Grove, Immunos #06-06, Singapore, Singapore
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Xu J, Ai J, Liu S, Peng X, Yu L, Geng M, Nan F. Design and synthesis of 3,3'-biscoumarin-based c-Met inhibitors. Org Biomol Chem 2014; 12:3721-34. [PMID: 24781551 DOI: 10.1039/c4ob00364k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A library of biscoumarin-based c-Met inhibitors was synthesized, based on optimization of 3,3'-biscoumarin hit 3, which was identified as a non-ATP competitive inhibitor of c-Met from a diverse library of coumarin derivatives. Among these compounds, 38 and 40 not only showed potent enzyme activities with IC50 values of 107 nM and 30 nM, respectively, but also inhibited c-Met phosphorylation in BaF3/TPR-Met and EBC-1 cells.
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Affiliation(s)
- Jimin Xu
- Chinese National Center for Drug Screening, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, 189 Guoshoujing Road, Zhangjiang Hi-Tech Park, Shanghai 201203, Republic of China.
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29
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Park TS, Donnenberg VS, Donnenberg AD, Zambidis ET, Zimmerlin L. Dynamic Interactions Between Cancer Stem Cells And Their Stromal Partners. CURRENT PATHOBIOLOGY REPORTS 2014; 2:41-52. [PMID: 24660130 PMCID: PMC3956651 DOI: 10.1007/s40139-013-0036-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The cancer stem cell (CSC) paradigm presumes the existence of self-renewing cancer cells capable of regenerating all tumor compartments and exhibiting stem cell-associated phenotypes. Recent interpretations of the CSC hypothesis envision stemness as a dynamic trait of tumor-initiating cells rather than a defined and unique cell type. Bidirectional crosstalk between the tumor microenvironment and the cancer bulk is well described in the literature and the tumor-associated stroma, vasculature and immune infiltrate have all been implicated as direct contributors to tumor development. These non-neoplastic cell types have also been shown to organize specific niches within the tumor bulk where they can control the intra-tumor CSC content and alter the fate of CSCs and tumor progenitors during tumorigenesis to acquire phenotypic features for invasion, metastasis and dormancy. Despite the complexity of the tumor-stroma interactome, novel therapeutic approaches envision combining tumor-ablative treatment with manipulation of the tumor microenvironment. We will review the currently available literature that provides clues about the complex cellular network that regulate the CSC phenotype and its niches during tumor progression.
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Affiliation(s)
- Tea Soon Park
- Institute for Cell Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, United States of America
- Division of Pediatric Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland, United States of America
| | - Vera S. Donnenberg
- University of Pittsburgh School of Medicine, Department of Cardiothoracic Surgery, Pittsburgh, Pennsylvania, United States of America
- University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania, United States of America
- McGowan Institute of Regenerative Medicine, Pittsburgh, Pennsylvania, United States of America
| | - Albert D. Donnenberg
- University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania, United States of America
- McGowan Institute of Regenerative Medicine, Pittsburgh, Pennsylvania, United States of America
- University of Pittsburgh School of Medicine, Department of Medicine, Division of Hematology/Oncology, Pittsburgh, Pennsylvania, United States of America
| | - Elias T. Zambidis
- Institute for Cell Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, United States of America
- Division of Pediatric Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland, United States of America
| | - Ludovic Zimmerlin
- Institute for Cell Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, United States of America
- Division of Pediatric Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland, United States of America
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30
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Zhang D, Zhang X, Ai J, Zhai Y, Liang Z, Wang Y, Chen Y, Li C, Zhao F, Jiang H, Geng M, Luo C, Liu H. Synthesis and biological evaluation of 2-amino-5-aryl-3-benzylthiopyridine scaffold based potent c-Met inhibitors. Bioorg Med Chem 2013; 21:6804-20. [DOI: 10.1016/j.bmc.2013.07.032] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 07/14/2013] [Accepted: 07/15/2013] [Indexed: 11/28/2022]
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31
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Michaud NR, Jani JP, Hillerman S, Tsaparikos KE, Barbacci-Tobin EG, Knauth E, Putz H, Campbell M, Karam GA, Chrunyk B, Gebhard DF, Green LL, Xu JJ, Dunn MC, Coskran TM, Lapointe JM, Cohen BD, Coleman KG, Bedian V, Vincent P, Kajiji S, Steyn SJ, Borzillo GV, Los G. Biochemical and pharmacological characterization of human c-Met neutralizing monoclonal antibody CE-355621. MAbs 2012; 4:710-23. [PMID: 23007574 DOI: 10.4161/mabs.22160] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The c-Met proto-oncogene is a multifunctional receptor tyrosine kinase that is stimulated by its ligand, hepatocyte growth factor (HGF), to induce cell growth, motility and morphogenesis. Dysregulation of c-Met function, through mutational activation or overexpression, has been observed in many types of cancer and is thought to contribute to tumor growth and metastasis by affecting mitogenesis, invasion, and angiogenesis. We identified human monoclonal antibodies that bind to the extracellular domain of c-Met and inhibit tumor growth by interfering with ligand-dependent c-Met activation. We identified antibodies representing four independent epitope classes that inhibited both ligand binding and ligand-dependent activation of c-Met in A549 cells. In cells, the antibodies antagonized c-Met function by blocking receptor activation and by subsequently inducing downregulation of the receptor, translating to phenotypic effects in soft agar growth and tubular morphogenesis assays. Further characterization of the antibodies in vivo revealed significant inhibition of c-Met activity (≥ 80% lasting for 72-96 h) in excised tumors corresponded to tumor growth inhibition in multiple xenograft tumor models. Several of the antibodies identified inhibited the growth of tumors engineered to overexpress human HGF and human c-Met (S114 NIH 3T3) when grown subcutaneously in athymic mice. Furthermore, lead candidate antibody CE-355621 inhibited the growth of U87MG human glioblastoma and GTL-16 gastric xenografts by up to 98%. The findings support published pre-clinical and clinical data indicating that targeting c-Met with human monoclonal antibodies is a promising therapeutic approach for the treatment of cancer.
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Affiliation(s)
- Neil R Michaud
- Pfizer Global Research and Development, Groton, CT, USA.
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32
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Hepatocyte growth factor mediates mesenchymal stem cell–induced recovery in multiple sclerosis models. Nat Neurosci 2012; 15:862-70. [PMID: 22610068 PMCID: PMC3427471 DOI: 10.1038/nn.3109] [Citation(s) in RCA: 319] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Accepted: 04/17/2012] [Indexed: 12/13/2022]
Abstract
Mesenchymal stem cells have emerged as a potential therapy for a range of neural insults. In animal models of multiple sclerosis, an autoimmune disease that targets oligodendrocytes and myelin, treatment with human MSCs results in functional improvement that reflects both modulation of the immune response and myelin repair. Here we demonstrate that conditioned medium (CM) from human MSCs reduces functional deficits in mouse MOG35–55-induced EAE and promotes the development of oligodendrocytes and neurons. Functional assays identify a critical role for Hepatocyte Growth Factor (HGF) and its primary receptor cMet in MSCs stimulated recovery in EAE, neural cell development and remyelination. Active MSC-CM contains HGF and exogenously supplied HGF promotes recovery in EAE while cMet and anti-HGF antibodies block the functional recovery mediated by HGF and MSC-CM. Systemic treatment with HGF dramatically accelerated remyelination in lysolecithin-induced rat dorsal spinal cord lesions and in slice cultures. Together these data strongly implicate HGF in mediating MSC-stimulated functional recovery in animal models of multiple sclerosis.
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33
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Cui JJ, McTigue M, Nambu M, Tran-Dubé M, Pairish M, Shen H, Jia L, Cheng H, Hoffman J, Le P, Jalaie M, Goetz GH, Ryan K, Grodsky N, Deng YL, Parker M, Timofeevski S, Murray BW, Yamazaki S, Aguirre S, Li Q, Zou H, Christensen J. Discovery of a Novel Class of Exquisitely Selective Mesenchymal-Epithelial Transition Factor (c-MET) Protein Kinase Inhibitors and Identification of the Clinical Candidate 2-(4-(1-(Quinolin-6-ylmethyl)-1H-[1,2,3]triazolo[4,5-b]pyrazin-6-yl)-1H-pyrazol-1-yl)ethanol (PF-04217903) for the Treatment of Cancer. J Med Chem 2012; 55:8091-109. [DOI: 10.1021/jm300967g] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- J. Jean Cui
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Michele McTigue
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Mitchell Nambu
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Michelle Tran-Dubé
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Mason Pairish
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Hong Shen
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Lei Jia
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Hengmiao Cheng
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Jacqui Hoffman
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Phuong Le
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Mehran Jalaie
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Gilles H. Goetz
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Kevin Ryan
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Neil Grodsky
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Ya-li Deng
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Max Parker
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Sergei Timofeevski
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Brion W. Murray
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Shinji Yamazaki
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Shirley Aguirre
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Qiuhua Li
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - Helen Zou
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
| | - James Christensen
- La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive,
San Diego, California 92121, United States
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34
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Discovery of novel 2-aminopyridine-3-carboxamides as c-Met kinase inhibitors. Bioorg Med Chem 2012; 20:5169-80. [DOI: 10.1016/j.bmc.2012.07.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2012] [Revised: 07/03/2012] [Accepted: 07/04/2012] [Indexed: 12/21/2022]
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35
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Muñoz Ú, Puche JE, Hannivoort R, Lang UE, Cohen-Naftaly M, Friedman SL. Hepatocyte growth factor enhances alternative splicing of the Kruppel-like factor 6 (KLF6) tumor suppressor to promote growth through SRSF1. Mol Cancer Res 2012; 10:1216-27. [PMID: 22859706 DOI: 10.1158/1541-7786.mcr-12-0213] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Alternative splicing of the Krüppel-like factor 6 (KLF6) tumor suppressor into an antagonistic splice variant 1 (SV1) is a pathogenic event in several cancers including hepatocellular carcinoma (HCC) because elevated SV1 is associated with increased tumor metastasis and mortality. Ras activation is one factor that can enhance KLF6 splicing in cancer cells, however pathways driving KLF6 splicing are unknown. Splice site selection is regulated by splice factors that include serine/arginine-rich (SR) proteins such as SRSF1 (ASF-SF2), which in turn is controlled by phosphoinositide 3-kinase (PI3K)/Akt and the mitogen-activated protein kinase (MAPK) signaling pathway. Because signaling pathways downstream of the liver mitogen hepatocyte growth factor (HGF) include Akt, we explored whether HGF induces KLF6 alternative splicing. In HepG2 cells, HGF (25 ng/mL) significantly increases the ratio of SV1/KLF6 full by 40% through phosphorylation of Akt and subsequent downregulation of two splicing regulators, SRSF3 (SRp20) and SRSF1. Decreased SRSF3 levels regulate SRSF1 levels by alternative splicing associated with the nonsense-mediated mRNA decay pathway (AS-NMD), which stimulates cell growth by decreasing p21 levels. Enhanced cell replication through increased KLF6 alternative splicing is a novel growth-promoting pathway of HGF that could contribute to the molecule's mitogenic activity in physiologic liver growth and hepatocellular carcinoma.
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Affiliation(s)
- Úrsula Muñoz
- Division of Liver Diseases, Mount Sinai School of Medicine, New York, NY 10029, USA
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36
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Bouzid K, Bedairia N, Marty M. Anticorps monoclonaux thérapeutiques en cancérologie. ACTA ACUST UNITED AC 2012; 60:223-8. [DOI: 10.1016/j.patbio.2012.05.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Accepted: 04/25/2012] [Indexed: 10/28/2022]
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Vermeulen L, de Sousa e Melo F, Richel DJ, Medema JP. The developing cancer stem-cell model: clinical challenges and opportunities. Lancet Oncol 2012; 13:e83-9. [PMID: 22300863 DOI: 10.1016/s1470-2045(11)70257-1] [Citation(s) in RCA: 267] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
During the past decade, a stem-cell-like subset of cancer cells has been identified in many malignancies. These cells, referred to as cancer stem cells (CSCs), are of particular interest because they are believed to be the clonogenic core of the tumour and therefore represent the cell population that drives growth and progression. Many efforts have been made to design therapies that specifically target the CSC population, since this was predicted to be the crucial population to eliminate. However, recent insights have complicated the initial elegant model, by showing a dominant role for the tumour microenvironment in determining CSC characteristics within a malignancy. This is particularly important since dedifferentiation of non-tumorigenic tumour cells towards CSCs can occur, and therefore the CSC population in a neoplasm is expected to vary over time. Moreover, evidence suggests that not all tumours are driven by rare CSCs, but might instead contain a large population of tumorigenic cells. Even though these results suggest that specific targeting of the CSC population might not be a useful therapeutic strategy, research into the hierarchical cellular organisation of malignancies has provided many important new insights in the biology of tumours. In this Personal View, we highlight how the CSC concept is developing and influences our thinking on future treatment for solid tumours, and recommend ways to design clinical trials to assess drugs that target malignant disease in a rational fashion.
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Affiliation(s)
- Louis Vermeulen
- Laboratory for Experimental Oncology and Radiobiology, Center for Experimental Molecular Medicine, Academic Medical Center, Amsterdam, Netherlands.
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38
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The interconnectedness of cancer cell signaling. Neoplasia 2012; 13:1183-93. [PMID: 22241964 DOI: 10.1593/neo.111746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 12/14/2011] [Accepted: 12/14/2011] [Indexed: 11/18/2022] Open
Abstract
The elegance of fundamental and applied research activities have begun to reveal a myriad of spatial and temporal alterations in downstream signaling networks affected by cell surface receptor stimulation including G protein-coupled receptors and receptor tyrosine kinases. Interconnected biochemical pathways serve to integrate and distribute the signaling information throughout the cell by orchestration of complex biochemical circuits consisting of protein interactions and covalent modification processes. It is clear that scientific literature summarizing results from both fundamental and applied scientific research activities has served to provide a broad foundational biologic database that has been instrumental in advancing our continued understanding of underlying cancer biology. This article reflects on historical advances and the role of innovation in the competitive world of grant-sponsored research.
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39
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Rasmussen SK, Nielsen LS, Müller C, Bouquin T, Næsted H, Mønster NT, Nygaard F, Weilguny D, Frandsen TP, Tolstrup AB. Recombinant antibody mixtures; optimization of cell line generation and single-batch manufacturing processes. BMC Proc 2011; 5 Suppl 8:O2. [PMID: 22373259 PMCID: PMC3285016 DOI: 10.1186/1753-6561-5-s8-o2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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40
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Abstract
The use of monoclonal antibodies (mAbs) has become a general approach for specifically targeting and treating human disease. In oncology, the therapeutic utility of mAbs is usually evaluated in the context of treatment with standard of care, as well as other small molecule targeted therapies. Many anti-cancer antibody modalities have achieved validation, including the targeting of growth factor and angiogenesis pathways, the induction of tumor cell killing or apoptosis, and the blocking of immune inhibitory mechanisms to stimulate anti-tumor responses. But, as with other targeted therapies, few antibodies are curative because of biological complexities that underlie tumor formation and redundancies in molecular pathways that enable tumors to adapt and show resistance to treatment. This review discusses the combinations of antibody therapeutics that are emerging to improve efficacy and durability within a specific biological mechanism (e.g., immunomodulation or the inhibition of angiogenesis) and across multiple biological pathways (e.g., inhibition of tumor growth and induction of tumor cell apoptosis).
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41
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Boltz A, Piater B, Toleikis L, Guenther R, Kolmar H, Hock B. Bi-specific aptamers mediating tumor cell lysis. J Biol Chem 2011; 286:21896-905. [PMID: 21531729 DOI: 10.1074/jbc.m111.238261] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Antibody-dependent cellular cytotoxicity plays a pivotal role in antibody-based tumor therapies and is based on the recruitment of natural killer cells to antibody-bound tumor cells via binding of the Fcγ receptor III (CD16). Here we describe the generation of chimeric DNA aptamers that simultaneously bind to CD16α and c-Met, a receptor that is overexpressed in many tumors. By application of the systematic evolution of ligands by exponential enrichment (SELEX) method, CD16α specific DNA aptamers were isolated that bound with high specificity and affinity (91 pm-195 nm) to their respective recombinant and cellularly expressed target proteins. Two optimized CD16α specific aptamers were coupled to each of two c-Met specific aptamers using different linkers. Bi-specific aptamers retained suitable binding properties and displayed simultaneous binding to both antigens. Moreover, they mediated cellular cytotoxicity dependent on aptamer and effector cell concentration. Displacement of a bi-specific aptamer from CD16α by competing antibody 3G8 reduced cytotoxicity and confirmed the proposed mode of action. These results represent the first gain of a tumor-effective function of two distinct oligonucleotides by linkage into a bi-specific aptamer mediating cellular cytotoxicity.
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Affiliation(s)
- Achim Boltz
- Clemens-Schoepf-Institute for Organic Chemistry and Biochemistry, Technical University Darmstadt, D-64289 Darmstadt, Germany
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42
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Dinosaurs and ancient civilizations: reflections on the treatment of cancer. Neoplasia 2011; 12:957-68. [PMID: 21170260 DOI: 10.1593/neo.101588] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Revised: 11/15/2010] [Accepted: 11/15/2010] [Indexed: 12/14/2022] Open
Abstract
Research efforts in the area of palaeopathology have been seen as an avenue to improve our understanding of the pathogenesis of cancer. Answers to questions of whether dinosaurs had cancer, or if cancer plagued ancient civilizations, have captured the imagination as well as the popular media. Evidence for dinosaurian cancer may indicate that cancer may have been with us from the dawn of time. Ancient recorded history suggests that past civilizations attempted to fight cancer with a variety of interventions. When contemplating the issue why a generalized cure for cancer has not been found, it might prove useful to reflect on the relatively limited time that this issue has been an agenda item of governmental attention as well as continued introduction of an every evolving myriad of manmade carcinogens relative to the total time cancer has been present on planet Earth. This article reflects on the history of cancer and the progress made following the initiation of the "era of cancer chemotherapy."
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43
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Dong J, Sereno A, Snyder WB, Miller BR, Tamraz S, Doern A, Favis M, Wu X, Tran H, Langley E, Joseph I, Boccia A, Kelly R, Wortham K, Wang Q, Berquist L, Huang F, Gao SX, Zhang Y, Lugovskoy A, Martin S, Gouvis H, Berkowitz S, Chiang G, Reff M, Glaser SM, Hariharan K, Demarest SJ. Stable IgG-like bispecific antibodies directed toward the type I insulin-like growth factor receptor demonstrate enhanced ligand blockade and anti-tumor activity. J Biol Chem 2011; 286:4703-17. [PMID: 21123183 PMCID: PMC3039382 DOI: 10.1074/jbc.m110.184317] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Revised: 11/02/2010] [Indexed: 12/11/2022] Open
Abstract
Bispecific antibodies (BsAbs) target multiple epitopes on the same molecular target or different targets. Although interest in BsAbs has persisted for decades, production of stable and active BsAbs has hindered their clinical evaluation. Here, we describe the production and characterization of tetravalent IgG-like BsAbs that combine the activities of allosteric and competitive inhibitors of the type-I insulin-like growth factor receptor (IGF-1R). The BsAbs, which were engineered for thermal stability, express well, demonstrate favorable biophysical properties, and recognize both epitopes on IGF-1R. Only one BsAb with a unique geometry, denoted BIIB4-5scFv, was capable of engaging all four of its binding arms simultaneously. All the BsAbs (especially BIIB4-5scFv) demonstrated enhanced ligand blocking over the single monoclonal antibodies (mAbs), particularly at high ligand concentrations. The pharmacokinetic profiles of two IgG-like BsAbs were tested in nude mice and shown to be comparable with that of the parental mAbs. The BsAbs, especially BIIB4-5scFv, demonstrated an improved ability to reduce the growth of multiple tumor cell lines and to inhibit ligand-induced IGF-1R signaling in tumor cells over the parental mAbs. BIIB4-5scFv also led to superior tumor growth inhibition over its parental mAbs in vivo. In summary, BsAbs that bridge multiple inhibitory mechanisms against a single target may generally represent a more effective strategy for intervention in oncology or other indications compared with traditional mAb therapy.
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MESH Headings
- Animals
- Antibodies, Bispecific/immunology
- Antibodies, Bispecific/pharmacokinetics
- Antibodies, Bispecific/pharmacology
- Antibodies, Monoclonal, Murine-Derived/immunology
- Antibodies, Monoclonal, Murine-Derived/pharmacokinetics
- Antibodies, Monoclonal, Murine-Derived/pharmacology
- Antineoplastic Agents/immunology
- Antineoplastic Agents/pharmacokinetics
- Antineoplastic Agents/pharmacology
- Cell Line, Tumor
- Drug Stability
- Humans
- Immunoglobulin G
- Ligands
- Mice
- Mice, Nude
- Neoplasms, Experimental/drug therapy
- Neoplasms, Experimental/immunology
- Protein Stability
- Receptor, IGF Type 1/antagonists & inhibitors
- Receptor, IGF Type 1/immunology
- Xenograft Model Antitumor Assays/methods
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Affiliation(s)
| | | | | | | | | | - Adam Doern
- From Biogen Idec, San Diego, California 92122
| | | | - Xiufeng Wu
- From Biogen Idec, San Diego, California 92122
| | - Hon Tran
- From Biogen Idec, San Diego, California 92122
| | | | | | | | | | | | - Qin Wang
- From Biogen Idec, San Diego, California 92122
| | | | - Flora Huang
- From Biogen Idec, San Diego, California 92122
| | | | - Ying Zhang
- From Biogen Idec, San Diego, California 92122
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44
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Abstract
Tumors are being increasingly perceived as abnormal organs that, in many respects, recapitulate the outgrowth and differentiation patterns of normal tissues. In line with this idea is the observation that only a small fraction of tumor cells is capable of initiating a new tumor. Because of the features that these cells share with somatic stem cells, they have been termed cancer stem cells (CSC). Normal stem cells reside in a "stem cell niche" that maintains them in a stem-like state. Recent data suggest that CSCs also rely on a similar niche, dubbed the "CSC niche," which controls their self-renewal and differentiation. Moreover, CSCs can be generated by the microenvironment through induction of CSC features in more differentiated tumor cells. In addition to a role in CSC maintenance, the microenvironment is hypothesized to be involved in metastasis by induction of the epithelial-mesenchymal transition, leading to dissemination and invasion of tumor cells. The localization of secondary tumors also seems to be orchestrated by the microenvironment, which is suggested to form a premetastatic niche. Thus, the microenvironment seems to be of crucial importance for primary tumor growth as well as metastasis formation. Combined with its role in the protection of CSCs against genotoxic insults, these data strongly put forward the niche as an important target for novel therapies.
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Affiliation(s)
- Tijana Borovski
- Laboratory for Experimental Oncology and Radiobiology, Center for Experimental Molecular Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
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45
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Gilbert DC, McIntyre A, Summersgill B, Missiaglia E, Goddard NC, Chandler I, Huddart RA, Shipley J. Minimum regions of genomic imbalance in stage I testicular embryonal carcinoma and association of 22q loss with relapse. Genes Chromosomes Cancer 2010; 50:186-95. [PMID: 21213372 DOI: 10.1002/gcc.20843] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Revised: 10/28/2010] [Accepted: 10/28/2010] [Indexed: 12/22/2022] Open
Abstract
Testicular germ cell tumors (TGCT) are the most frequent solid tumor to affect young adult males and are histologically divided into seminomas and nonseminomas (NS). NS comprise undifferentiated embryonal carcinoma (EC) and differentiated tumors with embryonic (teratoma) or extra-embryonic (choriocarcinoma, yolk sac tumor) features. In contrast to other subtypes, EC have uniform cellular morphology and lack normal cell infiltrates, ideal for nucleic acid profiling. EC are under-represented in previous studies due to their relative rarity. To gain insights into NS tumorigenesis, metastatic dissemination and potential markers of relapse, a full tiling path BAC platform was used to obtain array comparative genomic hybridization (aCGH) profiles from 32 formalin fixed paraffin embedded stage I EC samples from patients with follow-up data. In addition to identifying regions previously described in TGCT, novel minimum overlapping regions of gain at 6p21.33, 10q11.21, and 22q13.32 and loss at 22q12.2 were defined and confirmed by fluorescence in situ hybridization analyses. Specifically, the region at 6p21.33 included OCT3/4, the expression of which is involved in the maintenance of pluripotency and the 10q11.21 region contains the gene encoding the RAS activating factor RASGEF1A, the expression of which was demonstrably increased in RNA extracted from these samples. The region of loss at 22q12.2 was more frequently seen in tumors that relapsed and protein expression of genes from 22q12.2 included PIK3IP1, a negative regulator of PI3 kinase signaling was reduced. These data support the role for genes involved in pluripotency and RAS/PI3K signaling in EC development and progression.
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Affiliation(s)
- Duncan C Gilbert
- Molecular Cytogenetics, Section of Molecular Carcinogenesis, The Institute of Cancer Research, Sutton, Surrey, SM2 5NG, UK
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de Sousa EMF, Vermeulen L, Richel D, Medema JP. Targeting Wnt Signaling in Colon Cancer Stem Cells. Clin Cancer Res 2010; 17:647-53. [DOI: 10.1158/1078-0432.ccr-10-1204] [Citation(s) in RCA: 169] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Bergeron S, Lemieux E, Durand V, Cagnol S, Carrier JC, Lussier JG, Boucher MJ, Rivard N. The serine protease inhibitor serpinE2 is a novel target of ERK signaling involved in human colorectal tumorigenesis. Mol Cancer 2010; 9:271. [PMID: 20942929 PMCID: PMC2967542 DOI: 10.1186/1476-4598-9-271] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Accepted: 10/13/2010] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Among the most harmful of all genetic abnormalities that appear in colorectal cancer (CRC) development are mutations of KRAS and its downstream effector BRAF as they result in abnormal extracellular signal-related kinase (ERK) signaling. In a previous report, we had shown that expression of a constitutive active mutant of MEK1 (caMEK) in normal rat intestinal epithelial cells (IECs) induced morphological transformation associated with epithelial to mesenchymal transition, growth in soft agar, invasion and metastases in nude mice. Results from microarrays comparing control to caMEK-expressing IECs identified the gene encoding for serpinE2, a serine protease inhibitor, as a potential target of activated MEK1. RESULTS 1- RT-PCR and western blot analyses confirmed the strong up-regulation of serpinE2 expression and secretion by IECs expressing oncogenic MEK, Ras or BRAF. 2- Interestingly, serpinE2 mRNA and protein were also markedly enhanced in human CRC cells exhibiting mutation in KRAS and BRAF. 3- RNAi directed against serpinE2 in caMEK-transformed rat IECs or in human CRC cell lines HCT116 and LoVo markedly decreased foci formation, anchorage-independent growth in soft agarose, cell migration and tumor formation in nude mice. 4- Treatment of CRC cell lines with U0126 markedly reduced serpinE2 mRNA levels, indicating that expression of serpinE2 is likely dependent of ERK activity. 5- Finally, Q-PCR analyses demonstrated that mRNA levels of serpinE2 were markedly increased in human adenomas in comparison to healthy adjacent tissues and in colorectal tumors, regardless of tumor stage and grade. CONCLUSIONS Our data indicate that serpinE2 is up-regulated by oncogenic activation of Ras, BRAF and MEK1 and contributes to pro-neoplastic actions of ERK signaling in intestinal epithelial cells. Hence, serpinE2 may be a potential therapeutic target for colorectal cancer treatment.
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Affiliation(s)
- Sébastien Bergeron
- Department of Anatomy and Cellular Biology, CIHR Team on Digestive Epithelium, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
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48
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Bernier J, Chababi W, Pomerleau V, Saucier C. Oncogenic engagement of the Met receptor is sufficient to evoke angiogenic, tumorigenic, and metastatic activities in rat intestinal epithelial cells. Am J Physiol Gastrointest Liver Physiol 2010; 299:G677-86. [PMID: 20539003 DOI: 10.1152/ajpgi.00315.2009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The deregulation of Met/hepatocyte growth factor (HGF) receptor tyrosine kinase signaling constitutes a common event in colorectal cancers. However, the physiopathological functions of such a deregulation remain poorly understood. In the present study, we investigated the role of the deregulation of Met receptor in the neoplastic transformation of intestinal epithelial cells. To do so, the normal, well-established and characterized rat intestinal epithelial IEC-6 cells were transduced with a retrovirus carrying the oncogenic constitutive active form of Met receptor, Tpr-Met. Herein, we show that compared with control IEC-6 cells, Tpr-Met-IEC-6 cells exhibit enhanced proliferation, loss of growth-contact inhibition, cell morphological alterations, actin cytoskeletal reorganization, loss of E-cadherin expression and anchorage-independent growth. Moreover, Tpr-Met-IEC-6 cells are conferred the capacity to produce the proangiogenic factor VEGF and to reduce the potent antiangiogenic factor thrombospondin-1. Of significance, Tpr-Met-IEC-6 cells are endowed with the ability to elicit angiogenic responses and to form tumors and metastases in vivo. Hence, our study demonstrates for the first time that the sole oncogenic engagement of Met receptor in normal intestinal epithelial cells is sufficient to induce a wide array of cancerous biological processes that are fundamental to the initiation and malignant progression of colorectal cancers.
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Affiliation(s)
- Jimmy Bernier
- Département d'Anatomie et de Biologie Cellulaire, Université de Sherbrooke, Québec, Canada
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49
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The War on Cancer rages on. Neoplasia 2010; 11:1252-63. [PMID: 20019833 DOI: 10.1593/neo.91866] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2009] [Revised: 11/03/2009] [Accepted: 11/03/2009] [Indexed: 02/08/2023] Open
Abstract
In 1971, the "War on Cancer" was launched by the US government to cure cancer by the 200-year anniversary of the founding of the United States of America, 1976. This article briefly looks back at the progress that has been made in cancer research and compares progress made in other areas of human affliction. While progress has indeed been made, the battle continues to rage on.
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