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Giardino Torchia ML, Letizia M, Gilbreth R, Merlino A, Sult E, Monks N, Chesebrough J, Tammali R, Chu N, Tong J, Meekin J, Schifferli K, Vashisht K, DaCosta K, Clarke L, Gesse C, Yao XT, Bridges C, Moody G. Rational design of chimeric antigen receptor T cells against glypican 3 decouples toxicity from therapeutic efficacy. Cytotherapy 2022; 24:720-732. [DOI: 10.1016/j.jcyt.2022.03.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 02/28/2022] [Accepted: 03/18/2022] [Indexed: 12/11/2022]
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Vène E, Jarnouen K, Ribault C, Vlach M, Verres Y, Bourgeois M, Lepareur N, Cammas-Marion S, Loyer P. Circumsporozoite Protein of Plasmodium berghei- and George Baker Virus A-Derived Peptides Trigger Efficient Cell Internalization of Bioconjugates and Functionalized Poly(ethylene glycol)-b-poly(benzyl malate)-Based Nanoparticles in Human Hepatoma Cells. Pharmaceutics 2022; 14:pharmaceutics14040804. [PMID: 35456637 PMCID: PMC9028075 DOI: 10.3390/pharmaceutics14040804] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 03/31/2022] [Accepted: 04/03/2022] [Indexed: 02/04/2023] Open
Abstract
In order to identify the peptides, selected from the literature, that exhibit the strongest tropism towards human hepatoma cells, cell uptake assays were performed using biotinylated synthetic peptides bound to fluorescent streptavidin or engrafted onto nanoparticles (NPs), prepared from biotin-poly(ethylene glycol)-block-poly(benzyl malate) (Biot-PEG-b-PMLABe) via streptavidin bridging. Two peptides, derived from the circumsporozoite protein of Plasmodium berghei- (CPB) and George Baker (GB) Virus A (GBVA10-9), strongly enhanced the endocytosis of both streptavidin conjugates and NPs in hepatoma cells, compared to primary human hepatocytes and non-hepatic cells. Unexpectedly, the uptake of CPB- and GBVA10-9 functionalized PEG-b-PMLABe-based NPs by hepatoma cells involved, at least in part, the peptide binding to apolipoproteins, which would promote NP’s interactions with cell membrane receptors of HDL particles. In addition, CPB and GBVA10-9 peptide–streptavidin conjugates favored the uptake by hepatoma cells over that of the human macrophages, known to strongly internalize nanoparticles by phagocytosis. These two peptides are promising candidate ligands for targeting hepatocellular carcinomas.
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Affiliation(s)
- Elise Vène
- Institut NUMECAN (Nutrition Metabolisms and Cancer), Inserm, UMR-S 1241, INRAE UMR-A 1341, Univ Rennes, F-35000 Rennes, France; (E.V.); (K.J.); (C.R.); (M.V.); (Y.V.)
- Pôle Pharmacie, Service Hospitalo-Universitaire de Pharmacie, CHU Rennes, F-35033 Rennes, France
| | - Kathleen Jarnouen
- Institut NUMECAN (Nutrition Metabolisms and Cancer), Inserm, UMR-S 1241, INRAE UMR-A 1341, Univ Rennes, F-35000 Rennes, France; (E.V.); (K.J.); (C.R.); (M.V.); (Y.V.)
| | - Catherine Ribault
- Institut NUMECAN (Nutrition Metabolisms and Cancer), Inserm, UMR-S 1241, INRAE UMR-A 1341, Univ Rennes, F-35000 Rennes, France; (E.V.); (K.J.); (C.R.); (M.V.); (Y.V.)
| | - Manuel Vlach
- Institut NUMECAN (Nutrition Metabolisms and Cancer), Inserm, UMR-S 1241, INRAE UMR-A 1341, Univ Rennes, F-35000 Rennes, France; (E.V.); (K.J.); (C.R.); (M.V.); (Y.V.)
- INRAE, Institut AGRO, PEGASE UMR 1348, F-35590 Saint-Gilles, France
| | - Yann Verres
- Institut NUMECAN (Nutrition Metabolisms and Cancer), Inserm, UMR-S 1241, INRAE UMR-A 1341, Univ Rennes, F-35000 Rennes, France; (E.V.); (K.J.); (C.R.); (M.V.); (Y.V.)
| | - Mickaël Bourgeois
- CRCINA, Inserm, CNRS, Université de Nantes, F-44000 Nantes, France;
- ARRONAX Cyclotron, F-44817 Saint Herblain, France
| | - Nicolas Lepareur
- Institut NUMECAN (Nutrition Metabolisms and Cancer), Inserm, UMR-S 1241, INRAE UMR-A 1341, Univ Rennes, F-35000 Rennes, France; (E.V.); (K.J.); (C.R.); (M.V.); (Y.V.)
- Comprehensive Cancer Center Eugène Marquis, F-35000 Rennes, France
- Correspondence: (N.L.); (S.C.-M.); (P.L.)
| | - Sandrine Cammas-Marion
- Institut NUMECAN (Nutrition Metabolisms and Cancer), Inserm, UMR-S 1241, INRAE UMR-A 1341, Univ Rennes, F-35000 Rennes, France; (E.V.); (K.J.); (C.R.); (M.V.); (Y.V.)
- Institut des Sciences Chimiques de Rennes (ISCR), Ecole Nationale Supérieure de Chimie de Rennes, CNRS UMR 6226, University of Rennes, F-35042 Rennes, France
- Correspondence: (N.L.); (S.C.-M.); (P.L.)
| | - Pascal Loyer
- Institut NUMECAN (Nutrition Metabolisms and Cancer), Inserm, UMR-S 1241, INRAE UMR-A 1341, Univ Rennes, F-35000 Rennes, France; (E.V.); (K.J.); (C.R.); (M.V.); (Y.V.)
- Correspondence: (N.L.); (S.C.-M.); (P.L.)
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DT389-YP7, a Recombinant Immunotoxin against Glypican-3 That Inhibits Hepatocellular Cancer Cells: An In Vitro Study. Toxins (Basel) 2021; 13:toxins13110749. [PMID: 34822533 PMCID: PMC8617615 DOI: 10.3390/toxins13110749] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 10/09/2021] [Accepted: 10/13/2021] [Indexed: 01/02/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is one of the high-metastatic types of cancer, and metastasis occurs in one-third of patients with HCC. To maintain the effectiveness of drug compounds on cancer cells and minimize their side effects on normal cells, it is important to use new approaches for overcoming malignancies. Immunotoxins (ITs), an example of such a new approach, are protein-structured compounds consisting of toxic and binding moieties which can specifically bind to cancer cells and efficiently induce cell death. Here, we design and scrutinize a novel immunotoxin against an oncofetal marker on HCC cells. We applied a truncated diphtheria toxin (DT389) without binding domain as a toxin moiety to be fused with a humanized YP7 scFv against a high-expressed Glypican-3 (GPC3) antigen on the surface of HCC cells. Cytotoxic effects of this IT were investigated on HepG2 (GPC3+) and SkBr3 (GPC3−) cell lines as positive- and negative-expressed GPC3 antigens. The dissociation constant (Kd) was calculated 11.39 nM and 18.02 nM for IT and YP7 scfv, respectively, whereas only IT showed toxic effects on the HepG2 cell line, and decreased cell viability (IC50 = 848.2 ng/mL). Changing morphology (up to 85%), cell cycle arrest at G2 phase (up to 13%), increasing intracellular reactive oxygen species (ROSs) (up to 50%), inducing apoptosis (up to 38% for apoptosis and 23% for necrosis), and an almost complete inhibition of cell movement were other effects of immunotoxin treatment on HepG2 cells, not on SkBr3 cell line. These promising results reveal that this new recombinant immunotoxin can be considered as an option as an HCC inhibitor. However, more extensive studies are needed to accomplish this concept.
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Immunotoxins Immunotherapy against Hepatocellular Carcinoma: A Promising Prospect. Toxins (Basel) 2021; 13:toxins13100719. [PMID: 34679012 PMCID: PMC8538445 DOI: 10.3390/toxins13100719] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 10/02/2021] [Accepted: 10/03/2021] [Indexed: 12/11/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is one of the most common cancers in the world. Therefore, fighting against such cancer is reasonable. Chemotherapy drugs are sometimes inefficient and often accompanied by undesirable side effects for patients. On the other hand, the emergence of chemoresistant HCC emphasizes the need for a new high-efficiency treatment strategy. Immunotoxins are armed and rigorous targeting agents that can purposefully kill cancer cells. Unlike traditional chemotherapeutics, immunotoxins because of targeted toxicity, insignificant cross-resistance, easy production, and other favorable properties can be ideal candidates against HCC. In this review, the characteristics of proper HCC-specific biomarkers for immunotoxin targeting were dissected. After that, the first to last immunotoxins developed for the treatment of liver cancer were discussed. So, by reviewing the strengths and weaknesses of these immunotoxins, we attempted to provide keynotes for designing an optimal immunotoxin against HCC.
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Yao HP, Zhao H, Hudson R, Tong XM, Wang MH. Duocarmycin-based antibody-drug conjugates as an emerging biotherapeutic entity for targeted cancer therapy: Pharmaceutical strategy and clinical progress. Drug Discov Today 2021; 26:1857-1874. [PMID: 34224904 DOI: 10.1016/j.drudis.2021.06.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 03/15/2021] [Accepted: 06/25/2021] [Indexed: 02/06/2023]
Abstract
Duocarmycins are a class of DNA minor-groove-binding alkylating molecules. For the past decade, various duocarmycin analogues have been used as payloads in the development of antibody-drug conjugates (ADCs). Currently, more than 15 duocarmycin-based ADCs have been studied preclinically, and some of them such as SYD985 have been granted Fast-Track Designation status. Nevertheless, progress in duocarmycin-based ADCs also faces challenges, with setbacks including the termination of BMS-936561/MDX-1203. In this review, we discuss issues associated with the efficacy, pharmacokinetic profile, and toxicological activity of these biotherapeutics. Furthermore, we summarize the latest advances in duocarmycin-based ADCs that have different target specificities and linker chemistries. Evidence from preclinical and clinical studies has indicated that duocarmycin-based ADCs are promising biotherapeutics for oncological application in the future.
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Affiliation(s)
- Hang-Ping Yao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China; National Clinical Research Center for Infectious Diseases, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
| | - Hui Zhao
- Office of Scientific Research, Zhongnan Hospital of Wuhan University, Wuhan, China.
| | - Rachel Hudson
- Cancer Biology Research Center, Texas Tech University Health Sciences Center, Amarillo, TX, USA; Department of Pharmaceutical Sciences, Jerry H. Hodge School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, TX, USA
| | - Xiang-Min Tong
- Department of Hematology, Zhejiang Provincial People's Hospital and People's Hospital of Hangzhou Medical College, Hangzhou, China.
| | - Ming-Hai Wang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China; National Clinical Research Center for Infectious Diseases, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China; Cancer Biology Research Center, Texas Tech University Health Sciences Center, Amarillo, TX, USA; Department of Pharmaceutical Sciences, Jerry H. Hodge School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, TX, USA.
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Gerlza T, Trojacher C, Kitic N, Adage T, Kungl AJ. Development of Molecules Antagonizing Heparan Sulfate Proteoglycans. Semin Thromb Hemost 2021; 47:316-332. [PMID: 33794555 DOI: 10.1055/s-0041-1725067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Heparan sulfate proteoglycans (HSPGs) occur in almost every tissue of the human body and consist of a protein core, with covalently attached glycosaminoglycan polysaccharide chains. These glycosaminoglycans are characterized by their polyanionic nature, due to sulfate and carboxyl groups, which are distributed along the chain. These chains can be modified by different enzymes at varying positions, which leads to huge diversity of possible structures with the complexity further increased by varying chain lengths. According to their location, HSPGs are divided into different families, the membrane bound, the secreted extracellular matrix, and the secretory vesicle family. As members of the extracellular matrix, they take part in cell-cell communication processes on many levels and with different degrees of involvement. Of particular therapeutic interest is their role in cancer and inflammation as well as in infectious diseases. In this review, we give an overview of the current status of medical approaches to antagonize HSPG function in pathology.
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Affiliation(s)
- Tanja Gerlza
- Karl-Franzens University Graz, Institute of Pharmaceutical Sciences, Graz, Austria
| | - Christina Trojacher
- Karl-Franzens University Graz, Institute of Pharmaceutical Sciences, Graz, Austria
| | - Nikola Kitic
- Karl-Franzens University Graz, Institute of Pharmaceutical Sciences, Graz, Austria
| | | | - Andreas J Kungl
- Karl-Franzens University Graz, Institute of Pharmaceutical Sciences, Graz, Austria.,Antagonis Biotherapeutics GmbH, Graz, Austria
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Hedgehog signaling activation required for glypican-6-mediated regulation of invasion, migration, and epithelial-mesenchymal transition of gastric cancer cells. Biosci Rep 2021; 40:225096. [PMID: 32478377 PMCID: PMC7295629 DOI: 10.1042/bsr20193181] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 05/13/2020] [Accepted: 05/13/2020] [Indexed: 02/08/2023] Open
Abstract
Gastric cancer (GC) is the fifth most common cancer worldwide and one of the most aggressive cancers in China. Glypican 6 is highly expressed in gastric adenocarcinoma and may act as a diagnostic and prognostic marker; however, the functional importance and molecular mechanism of glypican 6 in GC remains unclear. In the current study, we aimed to reveal the function and mechanism of glypican 6 in two GC cell lines: MKN-45 and SGC-7901. We found higher expression of glypican 6 in MKN-45 and SGC-7901 cells than in cells from the normal gastric mucosa epithelial cell line GES-1. Glypican 6 knockdown suppressed MKN-45 and SGC-7901 cell proliferation. A Transwell assay confirmed that glypican 6 silencing inhibited the migration and invasiveness of MKN-45 and SGC-7901 cells. Epithelial-to-mesenchymal transition (EMT) markers were determined by western blotting, and the results showed reduced Vimentin expression and elevated E-cadherin expression in glypican 6 short interfering RNA (siRNA) transfected MKN-45 and SGC-7901 cells. However, glypican 6 overexpression in GES-1 cells showed no significant promotion on GES-1 cells proliferation and migration. Further studies confirmed that glypican 6 siRNA regulated Hedgehog and Gli1 signaling and participated in the function of glypican 6 on MKN-45 and SGC-7901 cell migration and invasion. Our findings suggest that decreased glypican 6 expression inhibits the migration and invasion ability of GC cells.
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Liu X, Li H, Cong X, Huo D, Cong L, Wu G. α-MSH-PE38KDEL Kills Melanoma Cells via Modulating Erk1/2/MITF/TYR Signaling in an MC1R-Dependent Manner. Onco Targets Ther 2020; 13:12457-12469. [PMID: 33299329 PMCID: PMC7721307 DOI: 10.2147/ott.s268554] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 11/09/2020] [Indexed: 12/14/2022] Open
Abstract
Background/Objective The immunotoxin α-MSH-PE38KDEL consisting of α-MSH and PE38KDEL showed high cytotoxicity on MSH receptor-positive melanoma cells, suggesting that α-MSH-PE38KDEL might be a potent drug for the treatment of melanoma. Herein, we explored whether the Erk1/2/MITF/TYR signaling, a verified target of α-MSH/MC1R, was involved in α-MSH-PE38KDEL-mediated cytotoxicity. Methods Human melanoma cell line A375, mouse melanoma cell line B16-F10, human breast cancer cell line MDA-MB-231 and human primary epidermal melanocytes (HEMa) with different expression levels of MC1R were used in this study. Cell apoptosis and viability were determined by using flow cytometry and MTT assays. Protein expressions were tested by Western blotting. Results The expression levels of MC1R in A375 and B16-F10 cells were significantly higher than that of MDA-MB-231 and HEMa. α-MSH-PE38KDEL treatment induced a significant inhibition in cell viability in A375 and B16-F10 cells, while showed no obvious influence in the viability of MDA-MB-231 and HEMa cells. However, knockdown of MC1R abolished α-MSH-PE38KDEL role in promoting cell apoptosis in A375 and B16-F10 cells, and upregulation of MC1R endowed α-MSH-PE38KDEL function to promote cell apoptosis in MDA-MB-231 and HEMa cells. Additionally, α-MSH-PE38KDEL treatment increased the phosphorylation levels of Erk1/2 and MITF (S73), and decreased MITF and TYR expressions in an MC1R-dependent manner. All of the treatments, including inhibition of Erk1/2 with PD98059, MC1R downregulation and MITF overexpression weakened the anti-tumor role of α-MSH-PE38KDEL in melanoma. Conclusion Collectively, this study indicates that α-MSH-PE38KDEL promotes melanoma cell apoptosis via modulating Erk1/2/MITF/TYR signaling in an MC1R-dependent manner.
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Affiliation(s)
- Xilin Liu
- Department of Hand Surgery, China Japan Union Hospital of Jilin University, Changchun City, Jilin Province 130033, People's Republic of China
| | - Hong Li
- Emergency Medical Department, China Japan Union Hospital of Jilin University, Changchun City, Jilin Province 130033, People's Republic of China
| | - Xianling Cong
- Tissue Bank, China Japan Union Hospital of Jilin University, Changchun City, Jilin Province 130033, People's Republic of China
| | - Da Huo
- Department of Hand Surgery, China Japan Union Hospital of Jilin University, Changchun City, Jilin Province 130033, People's Republic of China
| | - Lele Cong
- Department of Dermatology, China Japan Union Hospital of Jilin University, Changchun City, Jilin Province 130033, People's Republic of China
| | - Guangzhi Wu
- Department of Hand Surgery, China Japan Union Hospital of Jilin University, Changchun City, Jilin Province 130033, People's Republic of China
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Xia L, Teng Q, Chen Q, Zhang F. Preparation and Characterization of Anti-GPC3 Nanobody Against Hepatocellular Carcinoma. Int J Nanomedicine 2020; 15:2197-2205. [PMID: 32280214 PMCID: PMC7125335 DOI: 10.2147/ijn.s235058] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 03/10/2020] [Indexed: 12/15/2022] Open
Abstract
Background Glypican-3 (GPC3) is a newly identified target molecule for the early diagnosis of hepatocellular carcinoma (HCC), while targeted inhibition of GPC3 signaling may help to control the proliferation and metastasis of HCC cells. The purpose of this study was to prepare the anti-GPC3 nanobody and to investigate the affinity of the anti-GPC3 nanobodies in vitro and the anticancer effects on hepatocellular carcinoma in vivo. Methods To screen for unknown anti-GPC3 antibodies, we constructed an antibody phage display library. After three rounds of panning, positive phage clones were identified by enzyme-linked immunosorbent assay (ELISA). Further, the nanobody fusion protein was expressed in E. coli BL21 cells and purified by affinity chromatography. Competitive ELISA and flow cytometry were conducted to confirm the affinity of the anti-GPC3 nanobodies in vitro. The antitumor effects of VHHGPC3 were assessed in vivo. Results The results showed that the nanobody VHHGPC3 had specific high-affinity binding to His-GPC3 antigen. Moreover, VHHGPC3 exhibited specific binding to commercial human GPC3 and recognized the surface GPC3 protein of the hepatoma cell line HepG2. Importantly, in vivo study showed that GPC3 nanobody suppresses the growth of HepG2 and improves the survival rate of tumor mice. Discussion In summary, our new anti-GPC3 nanobody suggests a strong application potential for targeted therapy of liver cancer.
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Affiliation(s)
- Lijie Xia
- Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi 830046, People's Republic of China
| | - Qiao Teng
- Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi 830046, People's Republic of China
| | - Qi Chen
- Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi 830046, People's Republic of China
| | - Fuchun Zhang
- Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi 830046, People's Republic of China
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Guo M, Zhang H, Zheng J, Liu Y. Glypican-3: A New Target for Diagnosis and Treatment of Hepatocellular Carcinoma. J Cancer 2020; 11:2008-2021. [PMID: 32127929 PMCID: PMC7052944 DOI: 10.7150/jca.39972] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 01/04/2020] [Indexed: 02/07/2023] Open
Abstract
Liver cancer is the second leading cause of cancer-related deaths worldwide, and hepatocellular carcinoma is the most common type. The pathogenesis of hepatocellular carcinoma is concealed, its progress is rapid, its prognosis is poor, and the mortality rate is high. Therefore, novel molecular targets for hepatocellular carcinoma early diagnosis and development of targeted therapy are critically needed. Glypican-3, a cell-surface glycoproteins in which heparan sulfate glycosaminoglycan chains are covalently linked to a protein core, is overexpressed in HCC tissues but not in the healthy adult liver. Thus, Glypican-3 is becoming a promising candidate for liver cancer diagnosis and immunotherapy. Up to now, Glypican-3 has been a reliable immunohistochemical marker for hepatocellular carcinoma diagnosis, and soluble Glypican-3 in serum has becoming a promising marker for liquid biopsy. Moreover, various immunotherapies targeting Glypican-3 have been developed, including Glypican-3 vaccines, anti- Glypican-3 immunotoxin and chimeric-antigen-receptor modified cells. In this review, we summarize and analyze the structure and physicochemical properties of Glypican-3 molecules, then review their biological functions and applications in clinical diagnosis, and explore the diagnosis and treatment strategies based on Glypican-3.
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Affiliation(s)
- Meng Guo
- National Key Laboratory of Medical Immunology &Institute of Immunology, Second Military Medical University, Shanghai, China
- Institute of Organ Transplantation, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Hailing Zhang
- Department of Neurology, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Jianming Zheng
- Department of Pathology ,Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Yangfang Liu
- Department of Pathology ,Changhai Hospital, Second Military Medical University, Shanghai, China
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11
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Role of cell surface proteoglycans in cancer immunotherapy. Semin Cancer Biol 2019; 62:48-67. [PMID: 31336150 DOI: 10.1016/j.semcancer.2019.07.012] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 07/05/2019] [Accepted: 07/17/2019] [Indexed: 12/23/2022]
Abstract
Over the past few decades, understanding how tumor cells evade the immune system and their communication with their tumor microenvironment, has been the subject of intense investigation, with the aim of developing new cancer immunotherapies. The current therapies against cancer such as monoclonal antibodies against checkpoint inhibitors, adoptive T-cell transfer, cytokines, vaccines, and oncolytic viruses have managed to improve the clinical outcome of the patients. However, in some tumor entities, the response is limited and could benefit from the identification of novel therapeutic targets. It is known that tumor-extracellular matrix interplay and matrix remodeling are necessary for anti-tumor and pro-tumoral immune responses. Proteoglycans are dominant components of the extracellular matrix and are a highly heterogeneous group of proteins characterized by the covalent attachment of a specific linear carbohydrate chain of the glycosaminoglycan type. At cell surfaces, these molecules modulate the expression and activity of cytokines, chemokines, growth factors, adhesion molecules, and function as signaling co-receptors. By these mechanisms, proteoglycans influence the behavior of cancer cells and their microenvironment during the progression of solid tumors and hematopoietic malignancies. In this review, we discuss why cell surface proteoglycans are attractive pharmacological targets in cancer, and we present current and recent developments in cancer immunology and immunotherapy utilizing proteoglycan-targeted strategies.
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Zhang Y, Qiu D, Li R, Liu Y, Shi S, Wang Y. Preparation of a monoclonal antibody against the carcinoembryonic antigen, glypican‑3. Mol Med Rep 2019; 19:3889-3895. [PMID: 30896845 DOI: 10.3892/mmr.2019.10019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 01/17/2019] [Indexed: 11/05/2022] Open
Abstract
The carcinoembryonic antigen, glypican‑3 (GPC3), is a putative therapeutic target and diagnostic marker of hepatoma. In the present study, a monoclonal antibody (mAb) specifically against GPC3 was obtained via cloning the sequence of GPC3 via polymerase chain reaction and inserting it into a pET16b vector prior to transfection into Escherichia coli (E. coli) BL21. BALB/c mice were immunized with 20 µg purified antigen by intrasplenic embedding. Splenocytes and mouse myeloma cells SP2/0 were fused; then, the hybridoma cells were screened by an indirect ELISA. The properties of the mAb were examined by western blotting and immunofluorescence analysis against the purified protein. The results revealed that the prokaryotic expression vector of GPC3 had been successfully generated and GPC3 was stably expressed in E. coli BL21. A stable hybridoma cell line, 2F3, was generated in the present study, which produced mAbs against GPC3. The mAb 2F3 had a high antibody titer and the isotype was identified as IgG1/κ; 2F3 hybridomas had a median chromosome number of 98. Western blot and immunofluorescence analyses revealed that 2F3 specifically recognized recombinant and native GPC3. The 2F3 clone was proposed as a stable secretor of this mAb against GPC3. The results of present study indicated that the successful preparation of recombinant GPC3 protein and an anti‑human GPC3 mouse mAb may be provide a basis for developments in the diagnosis and treatment of liver cancer.
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Affiliation(s)
- Yongdong Zhang
- Department of Stomatology, Tianjin First Central Hospital, Tianjin 300192, P.R. China
| | - Dongri Qiu
- Department of Stomatology, Tianjin First Central Hospital, Tianjin 300192, P.R. China
| | - Ronghua Li
- Department of Stomatology, Tianjin First Central Hospital, Tianjin 300192, P.R. China
| | - Yawu Liu
- Department of Clinical Radiology, Kuopio University Hospital, FIN‑70210 Kuopio, Finland
| | - Shuainan Shi
- Department of Clinical Laboratory Medicine, The Second Hospital of Tianjin Medical University, Tianjin Institute of Urology, Tianjin 300211, P.R. China
| | - Yuliang Wang
- Department of Clinical Laboratory Medicine, The Second Hospital of Tianjin Medical University, Tianjin Institute of Urology, Tianjin 300211, P.R. China
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Ge S, Wang D, Lv B, Yang S, Liu C, Xu B, Zhao C, Qin Y, Xu J. HCRP1, ID4 and Glypican-3: an optimal panel of biomarkers for diagnosis of hepatocellular carcinoma. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2018; 11:5774-5782. [PMID: 31949663 PMCID: PMC6963063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 10/25/2018] [Indexed: 06/10/2023]
Abstract
BACKGROUND Hepatocellular carcinoma (HCC) is one of the most common malignancies worldwide with high morbidity and mortality. The aim of this study was to assess the diagnostic role of HCC related protein 1 (HCRP1) and inhibitor of DNA Binding 4 (ID4) as novel reliable markers for HCC diagnosis. METHODS Immunohistochemistry for HCRP1, ID4 and Glypican-3 (GPC-3) was performed in 98 cases of HCCs, 15 large regenerative nodules arising in cirrhotic livers, 12 hepatocellular adenomas (HCA), 10 focal nodular hyperplasias (FNH), and 20 specimens of normal liver tissues (NL). RESULTS HCRP1 immunoactivity was decreased in 64 of 98 (65.3%) HCC cases but present in almost all of the benign liver nodules (56/57, 98.2%, P < 0.001). 68 of 98 (69.4%) and 70 of 98 (71.4%) HCC cases were positive for ID4 and GPC-3, respectively, which were much higher than in benign lesions. Even though HCRP1 is highly specific (98.25%) in differentiating well differentiated HCC (WDHCC) from benign liver nodules, it has only a limited value because of its low sensitivity (37.5%), neither for the ID4, GPC-3 alone or combination (P > 0.05). The expression of HCRP1 alone could efficiently distinguish WDHCC from moderate-poorly differentiated HCC (M-PHCC), and the combination of using either two or three markers could notably increase the diagnosis accuracy (P < 0.05). CONCLUSION HCRP1 and ID4 represent potentially novel valuable biomarkers for distinguishing HCC from benign liver nodules, and it is recommended to use the combination of HCRP1, ID4 and GPC-3 as a panel in HCC differentiation estimation.
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Affiliation(s)
- Shujian Ge
- Department of Science and Education, Shandong Provincial Hospital Affiliated to Shandong UniversityJinan, Shandong, PR China
| | - Dan Wang
- Department of Science and Education, Shandong Provincial Hospital Affiliated to Shandong UniversityJinan, Shandong, PR China
| | - Beibei Lv
- Department of Pathology, Shandong Provincial Hospital Affiliated to Shandong UniversityJinan, Shandong, PR China
| | - Shuping Yang
- Department of Oncology, Shandong Provincial Hospital Affiliated to Shandong UniversityJinan, Shandong, PR China
| | - Chunmei Liu
- Department of Clinical Laboratory, Shandong Provincial Hospital Affiliated to Shandong UniversityJinan, Shandong, PR China
| | - Bin Xu
- Department of Pathology, Shengli Oil Field Central HospitalDongying, Shandong Province, PR China
| | - Chunming Zhao
- Department of Ophthalmology, Shandong Provincial Hospital Affiliated to Shandong UniversityJinan, Shandong, PR China
| | - Yejun Qin
- Department of Pathology, Shandong Provincial Hospital Affiliated to Shandong UniversityJinan, Shandong, PR China
| | - Jiawen Xu
- Department of Pathology, Shandong Provincial Hospital Affiliated to Shandong UniversityJinan, Shandong, PR China
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14
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Karamanos NK, Piperigkou Z, Theocharis AD, Watanabe H, Franchi M, Baud S, Brézillon S, Götte M, Passi A, Vigetti D, Ricard-Blum S, Sanderson RD, Neill T, Iozzo RV. Proteoglycan Chemical Diversity Drives Multifunctional Cell Regulation and Therapeutics. Chem Rev 2018; 118:9152-9232. [DOI: 10.1021/acs.chemrev.8b00354] [Citation(s) in RCA: 193] [Impact Index Per Article: 32.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Nikos K. Karamanos
- Biochemistry, Biochemical Analysis & Matrix Pathobiology Research Group, Laboratory of Biochemistry, Department of Chemistry, University of Patras, Patras 26110, Greece
- Foundation for Research and Technology-Hellas (FORTH)/Institute of Chemical Engineering Sciences (ICE-HT), Patras 26110, Greece
| | - Zoi Piperigkou
- Biochemistry, Biochemical Analysis & Matrix Pathobiology Research Group, Laboratory of Biochemistry, Department of Chemistry, University of Patras, Patras 26110, Greece
- Foundation for Research and Technology-Hellas (FORTH)/Institute of Chemical Engineering Sciences (ICE-HT), Patras 26110, Greece
| | - Achilleas D. Theocharis
- Biochemistry, Biochemical Analysis & Matrix Pathobiology Research Group, Laboratory of Biochemistry, Department of Chemistry, University of Patras, Patras 26110, Greece
| | - Hideto Watanabe
- Institute for Molecular Science of Medicine, Aichi Medical University, Aichi 480-1195, Japan
| | - Marco Franchi
- Department for Life Quality Studies, University of Bologna, Rimini 47100, Italy
| | - Stéphanie Baud
- Université de Reims Champagne-Ardenne, Laboratoire SiRMa, CNRS UMR MEDyC 7369, Faculté de Médecine, 51 rue Cognacq Jay, Reims 51100, France
| | - Stéphane Brézillon
- Université de Reims Champagne-Ardenne, Laboratoire de Biochimie Médicale et Biologie Moléculaire, CNRS UMR MEDyC 7369, Faculté de Médecine, 51 rue Cognacq Jay, Reims 51100, France
| | - Martin Götte
- Department of Gynecology and Obstetrics, Münster University Hospital, Münster 48149, Germany
| | - Alberto Passi
- Department of Medicine and Surgery, University of Insubria, Varese 21100, Italy
| | - Davide Vigetti
- Department of Medicine and Surgery, University of Insubria, Varese 21100, Italy
| | - Sylvie Ricard-Blum
- University Claude Bernard Lyon 1, CNRS, UMR 5246, Institute of Molecular and Supramolecular Chemistry and Biochemistry, Villeurbanne 69622, France
| | - Ralph D. Sanderson
- Department of Pathology, Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
| | - Thomas Neill
- Department of Pathology, Anatomy and Cell Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania 10107, United States
| | - Renato V. Iozzo
- Department of Pathology, Anatomy and Cell Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania 10107, United States
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15
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Lipovšek D, Carvajal I, Allentoff AJ, Barros A, Brailsford J, Cong Q, Cotter P, Gangwar S, Hollander C, Lafont V, Lau WL, Li W, Moreta M, O'Neil S, Pinckney J, Smith MJ, Su J, Terragni C, Wallace MA, Wang L, Wright M, Marsh HN, Bryson JW. Adnectin-drug conjugates for Glypican-3-specific delivery of a cytotoxic payload to tumors. Protein Eng Des Sel 2018; 31:159-171. [PMID: 30247737 PMCID: PMC6158766 DOI: 10.1093/protein/gzy013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 05/21/2018] [Accepted: 05/30/2018] [Indexed: 12/12/2022] Open
Abstract
Tumor-specific delivery of cytotoxic agents remains a challenge in cancer therapy. Antibody-drug conjugates (ADC) deliver their payloads to tumor cells that overexpress specific tumor-associated antigens-but the multi-day half-life of ADC leads to high exposure even of normal, antigen-free, tissues and thus contributes to dose-limiting toxicity. Here, we present Adnectin-drug conjugates, an alternative platform for tumor-specific delivery of cytotoxic payloads. Due to their small size (10 kDa), renal filtration eliminates Adnectins from the bloodstream within minutes to hours, ensuring low exposure to normal tissues. We used an engineered cysteine to conjugate an Adnectin that binds Glypican-3, a membrane protein overexpressed in hepatocellular carcinoma, to a cytotoxic derivative of tubulysin, with the drug-to-Adnectin ratio of 1. We demonstrate specific, nanomolar binding of this Adnectin-drug conjugate to human and murine Glypican-3; its high thermostability; its localization to target-expressing tumor cells in vitro and in vivo, its fast clearance from normal tissues and its efficacy against Glypican-3-positive mouse xenograft models.
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Affiliation(s)
- Daša Lipovšek
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - Irvith Carvajal
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | | | - Anthony Barros
- Preclinical Candidate Optimization, Bristol-Myers Squibb, Lawrenceville, NJ, USA
| | - John Brailsford
- Radiochemistry, Bristol-Myers Squibb, Lawrenceville, NJ, USA
| | - Qiang Cong
- Discovery Chemistry Oncology, Bristol-Myers Squibb, Redwood City, CA, USA
| | - Pete Cotter
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - Sanjeev Gangwar
- Discovery Chemistry Oncology, Bristol-Myers Squibb, Redwood City, CA, USA
| | - Cris Hollander
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - Virginie Lafont
- Molecular Discovery Technologies, Bristol-Myers Squibb, Lawrenceville, NJ, USA
| | - Wai Leung Lau
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - Wenying Li
- Preclinical Candidate Optimization, Bristol-Myers Squibb, Lawrenceville, NJ, USA
| | - Miguel Moreta
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - Steven O'Neil
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - Jason Pinckney
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - Michael J Smith
- Chemical and Synthetic Development, Bristol-Myers Squibb, New Brunswick, NJ, USA
| | - Julie Su
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - Christina Terragni
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | | | - Lifei Wang
- Preclinical Candidate Optimization, Bristol-Myers Squibb, Lawrenceville, NJ, USA
| | - Martin Wright
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - H Nicholas Marsh
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
| | - James W Bryson
- Molecular Discovery Technologies, Bristol-Myers Squibb, Waltham, MA, USA
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16
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Li YC, Yang CS, Zhou WL, Li HS, Han YJ, Wang QS, Wu HB. Low glucose metabolism in hepatocellular carcinoma with GPC3 expression. World J Gastroenterol 2018; 24:494-503. [PMID: 29398870 PMCID: PMC5787784 DOI: 10.3748/wjg.v24.i4.494] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/20/2017] [Accepted: 12/26/2017] [Indexed: 02/06/2023] Open
Abstract
AIM To investigate the relationship between glucose metabolism and glypican-3 (GPC3) expression in hepatocellular carcinoma (HCC).
METHODS Immunohistochemical staining of pathological samples for GPC3 and glucose transporter 1 (GLUT1), and whole-body 18F-FDG PET/CT for measuring tumour glucose uptake were performed in 55 newly diagnosed HCC patients. The maximum standard uptake value (SUVmax) and tumour-to-non-tumourous liver uptake (T/NT) ratio were used to quantify 18F-FDG uptake. In vitro18F-FDG uptake assay of GPC3-expressing HepG2 and non-GPC3-expressing RH7777 cells was used to examine the effect of GPC3 in cellular glucose metabolism. The relationships between GPC3 expression and 18F-FDG uptake, GLUT1 expression, tumour differentiation, and other clinical indicators were analysed using Spearman rank correlation, univariate and multiple logistic regression analyses.
RESULTS Positive GPC3 expression was observed in 67.3% of HCC patients, including 75.0% of those with well or moderately differentiated HCC and 36.4% of those with poorly differentiated HCC. There was an inverse relationship between GPC3 expression and SUVmax (Spearman correlation coefficient = -0.281, P = 0.038) and a positive relationship between GLUT1 expression and SUVmax (Spearman correlation coefficient = 0.681, P < 0.001) in patients with HCC. Univariate analysis showed that two glucose metabolic parameters (SUVmax and T/NT ratio), tumour differentiation, lymph node metastasis, and TNM stage were all significantly associated with GPC3 expression (P < 0.05), whereas GLUT1 expression, sex, age, tumour size, intrahepatic lesion number, and distant metastasis showed no statistical association (P > 0.05). Further multivariate analysis revealed that only the T/N ratio was significantly correlated with GPC3 expression in patients with HCC (P < 0.05). In vitro assay revealed that the uptake of 18F-FDG in GPC3-expressing HepG2 cells was significantly lower than that of non-GPC3-expressing RH7777 cells (t = -20.352, P < 0.001).
CONCLUSION The present study demonstrated that GPC3 expression is inversely associated with glucose metabolism, suggesting that GPC3 may play a role in regulating glucose metabolism in HCC.
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Affiliation(s)
- You-Cai Li
- Nanfang PET Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, Guangdong Province, China
| | - Chuan-Sheng Yang
- Nanfang PET Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, Guangdong Province, China
| | - Wen-Lan Zhou
- Nanfang PET Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, Guangdong Province, China
| | - Hong-Sheng Li
- Nanfang PET Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, Guangdong Province, China
| | - Yan-Jiang Han
- Nanfang PET Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, Guangdong Province, China
| | - Quan-Shi Wang
- Nanfang PET Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, Guangdong Province, China
| | - Hu-Bing Wu
- Nanfang PET Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, Guangdong Province, China
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17
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Nugent M, Wang J, Lawrence G, Zurawski T, Geoghegan JA, Dolly JO. Conjugate of an IgG Binding Domain with Botulinum Neurotoxin A Lacking the Acceptor Moiety Targets Its SNARE Protease into TrkA-Expressing Cells When Coupled to Anti-TrkA IgG or Fc-βNGF. Bioconjug Chem 2017; 28:1684-1692. [PMID: 28489355 DOI: 10.1021/acs.bioconjchem.7b00157] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Numerous naturally occurring toxins can perturb biological systems when they invade susceptible cells. Coupling of pertinent targeting ligands to the active domains of such proteins provides a strategy for directing these to particular cellular populations implicated in disease. A novel approach described herein involved fusion of one mutated immunoglobulin G (IgG) binding moiety of staphylococcal protein A to the SNARE protease and translocation domain of botulinum neurotoxin A (BoNT/A). This chimera could be monovalently coupled to IgG or via its Fc region to recombinant targeting ligands. The utility of the resulting conjugates is demonstrated by the delivery of a SNARE protease into a cell line expressing tropomyosin receptor kinase A (TrkA) through coupling to anti-TrkA IgG or a fusion of Fc and nerve-growth factor. Thus, this is a versitile and innovative technology for conjugating toxins to diverse ligands for retargeted cell delivery of potential therapeutics.
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Affiliation(s)
- Marc Nugent
- International Centre for Neurotherapeutics, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Jiafu Wang
- International Centre for Neurotherapeutics, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Gary Lawrence
- International Centre for Neurotherapeutics, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Tomas Zurawski
- International Centre for Neurotherapeutics, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Joan A Geoghegan
- Department of Microbiology, Moyne Institute of Preventive Medicine, School of Genetics and Microbiology, Trinity College Dublin , Dublin 2, Ireland
| | - J Oliver Dolly
- International Centre for Neurotherapeutics, Dublin City University , Glasnevin, Dublin 9, Ireland
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18
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Mayer K, Schröder A, Schnitger J, Stahl S, Brinkmann U. Influence of DPH1 and DPH5 Protein Variants on the Synthesis of Diphthamide, the Target of ADPRibosylating Toxins. Toxins (Basel) 2017; 9:E78. [PMID: 28245596 PMCID: PMC5371833 DOI: 10.3390/toxins9030078] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 02/20/2017] [Indexed: 01/22/2023] Open
Abstract
The diphthamide on eukaryotic translation elongation factor 2 (eEF2) is the target of ADPribosylating toxins and -derivatives that serve as payloads in targeted tumor therapy. Diphthamide is generated by seven DPH proteins; cells deficient in these (DPHko) lack diphthamide and are toxin-resistant. We have established assays to address the functionality of DPH1 (OVCA1) and DPH5 variants listed in dbSNP and cosmic databases: plasmids encoding wildtype and mutant DPHs were transfected into DPHko cells. Supplementation of DPH1 and DPH5 restores diphthamide synthesis and toxin sensitivity in DPH1ko and DPH5ko cells, respectively. Consequently, the determination of the diphthamide status of cells expressing DPH variants differentiates active and compromised proteins. The DPH1 frameshift variant L96fs* (with Nterminal 96 amino acids, truncated thereafter) and two splice isoforms lacking 80 or 140 amino acids at their N-termini failed to restore DPH1ko deficiency. The DPH1 frameshift variant R312fs* retained some residual activity even though it lacks a large C-terminal portion. DPH1 missense variants R27W and S56F retained activity while S221P had reduced activity, indicated by a decreased capability to restore diphthamide synthesis. The DPH5 nonsense or frameshift variants E60*, W136fs* and R207* (containing intact N-termini with truncations after 60, 136 or 207 amino acids, respectively) were inactive: none compensated the deficiency of DPH5ko cells. In contrast, missense variants D57G, G87R, S123C and Q170H as well as the frequently occurring DPH5 isoform delA212 retained activity. Sensitivity to ADP-ribosylating toxins and tumor-targeted immunotoxins depends on diphthamide which, in turn, requires DPH functionality. Because of that, DPH variants (in particular those that are functionally compromised) may serve as a biomarker and correlate with the efficacy of immunotoxin-based therapies.
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Affiliation(s)
- Klaus Mayer
- Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Munich, Nonnenwald 2, 82377 Penzberg, Germany.
| | - Anna Schröder
- Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Munich, Nonnenwald 2, 82377 Penzberg, Germany.
| | - Jerome Schnitger
- Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Munich, Nonnenwald 2, 82377 Penzberg, Germany.
| | - Sebastian Stahl
- Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Munich, Nonnenwald 2, 82377 Penzberg, Germany.
| | - Ulrich Brinkmann
- Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Munich, Nonnenwald 2, 82377 Penzberg, Germany.
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