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Pal D, De K, Yates TB, Kolape J, Muchero W. Mutating novel interaction sites in NRP1 reduces SARS-CoV-2 spike protein internalization. iScience 2023; 26:106274. [PMID: 36910328 PMCID: PMC9957656 DOI: 10.1016/j.isci.2023.106274] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 01/13/2023] [Accepted: 02/20/2023] [Indexed: 03/02/2023] Open
Abstract
The global pandemic of coronavirus disease 2019 caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virus has become a severe global health problem because of its rapid spread. Both Ace2 and NRP1 provide initial viral binding sites for SARS-CoV-2. Here, we show that cysteine residues located in the vestigial plasminogen-apple-nematode (PAN) domain of NRP1 are necessary for SARS-CoV-2 spike protein internalization. Mutating novel cysteine residues in the PAN altered NRP1 stability and downstream activation of extracellular signal-regulated kinase (ERK) signaling pathway and impaired its interaction with the spike protein. This resulted in a significant reduction in spike protein abundance in Vero-E6 cells for the original, alpha, and delta SARS-CoV-2 variants even in the presence of the Ace2. Moreover, mutating these cysteine residues in NRP1 significantly lowered its association with Plexin-A1. As the spike protein is a critical component for targeted therapy, our biochemical study may represent a distinct mechanism to develop a path for future therapeutic discovery.
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Affiliation(s)
- Debjani Pal
- Radioisotope Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
- Bioscience Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831, USA
| | - Kuntal De
- Bioscience Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831, USA
| | - Timothy B. Yates
- Bioscience Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831, USA
- Bredesen Center for Interdisciplinary Research, University of Tennessee, Knoxville, TN 37996, USA
| | - Jaydeep Kolape
- Biochemistry & Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA
| | - Wellington Muchero
- Bioscience Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831, USA
- Bredesen Center for Interdisciplinary Research, University of Tennessee, Knoxville, TN 37996, USA
- Corresponding author
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2
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Abstract
Single-pass transmembrane receptors (SPTMRs) represent a diverse group of integral membrane proteins that are involved in many essential cellular processes, including signal transduction, cell adhesion, and transmembrane transport of materials. Dysregulation of the SPTMRs is linked with many human diseases. Despite extensive efforts in past decades, the mechanisms of action of the SPTMRs remain incompletely understood. One major hurdle is the lack of structures of the full-length SPTMRs in different functional states. Such structural information is difficult to obtain by traditional structural biology methods such as X-ray crystallography and nuclear magnetic resonance (NMR). The recent rapid development of single-particle cryo-electron microscopy (cryo-EM) has led to an exponential surge in the number of high-resolution structures of integral membrane proteins, including SPTMRs. Cryo-EM structures of SPTMRs solved in the past few years have tremendously improved our understanding of how SPTMRs function. In this review, we will highlight these progresses in the structural studies of SPTMRs by single-particle cryo-EM, analyze important structural details of each protein involved, and discuss their implications on the underlying mechanisms. Finally, we also briefly discuss remaining challenges and exciting opportunities in the field.
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Affiliation(s)
- Kai Cai
- Departments of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75231, USA
| | - Xuewu Zhang
- Departments of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75231, USA
- Departments of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75231, USA
- Corresponding Author: Xuewu Zhang, Department of pharmacology, UT Southwestern Medical Center, Dallas, TX 75390, USA;
| | - Xiao-chen Bai
- Departments of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75231, USA
- Departments of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75231, USA
- Corresponding Author: Xiao-chen Bai, Department of Biophysics, UT Southwestern Medical Center, Dallas, TX 75390, USA;
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3
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Host Manipulation Mechanisms of SARS-CoV-2. Acta Biotheor 2021; 70:4. [PMID: 34902063 PMCID: PMC8667538 DOI: 10.1007/s10441-021-09425-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 08/16/2021] [Indexed: 10/28/2022]
Abstract
Viruses are the simplest of pathogens, but possess sophisticated molecular mechanisms to manipulate host behavior, frequently utilizing molecular mimicry. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been shown to bind to the host receptor neuropilin-1 in order to gain entry into the cell. To do this, the virus utilizes its spike protein polybasic cleavage site (PCS), which mimics the CendR motif of neuropilin-1's endogenous ligands. In addition to facilitating cell entry, binding to neuropilin-1 has analgesic effects. We discuss the potential impact of neuropilin-1 binding by SARS-CoV-2 in ameliorating sickness behavior of the host, and identify a convergent evolutionary strategy of PCS cleavage and subsequent neuropilin binding in other human viruses. In addition, we discuss the evolutionary leap of the ancestor of SARS-COV-2, which involved acquisition of the PCS thus faciliting binding to the neuropilin-1 receptor. Acquisition of the PCS by the ancestor of SARS-CoV-2 appears to have led to pleiotropic beneficial effects including enhancement of cell entry via binding to ACE2, facilitation of cell entry via binding to neuropilin-1, promotion of analgesia, and potentially the formation of decoy epitopes via enhanced shedding of the S1 subunit. Lastly, other potential neuromanipulation strategies employed by SARS-CoV-2 are discussed, including interferon suppression and the resulting reduction in sickness behavior, enhanced transmission through neurally mediated cough induction, and reduction in sense of smell.
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4
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Jobe A, Vijayan R. Characterization of peptide binding to the SARS-CoV-2 host factor neuropilin. Heliyon 2021; 7:e08251. [PMID: 34722943 PMCID: PMC8540010 DOI: 10.1016/j.heliyon.2021.e08251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Revised: 08/25/2021] [Accepted: 10/21/2021] [Indexed: 11/04/2022] Open
Abstract
The ongoing coronavirus disease 2019 (COVID-19) pandemic, caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is a global health concern. It is now well established that the spike (S) protein of SARS-CoV-2 interacts with its primary host receptor, the angiotensin converting enzyme 2 (ACE2). Additionally, the interaction of S with the neuropilin (NRP) receptor has been reported to facilitate viral entry. SARS-CoV-2 S protein binds to neuropilin-1 (NRP1) by virtue of a CendR motif which terminates with either an arginine or lysine. Furthermore, a number of different peptide sequences have been reported to bind to the same site in NRP1 including vascular endothelial growth factor A and other viral proteins. To gain a deeper understanding of additional factors besides the C-terminal arginine that may favour high NRP1 binding, several modelled peptides were investigated using triplicate 1 μs molecular dynamics simulations. A C-end histidine failed to exhibit strong NRP1 affinity. Some previously reported factors that increase binding affinity and secure NRP1 receptor activation was observed in the NRP1-peptide complexes studied and such complexes had higher molecular mechanics-generalized Born surface area based free energy of binding. Additionally, the results also highlight the relevance of an exposed arginine at its canonical location as capping it blocked arginine from engaging key residues at the NRP1 receptor site that are indispensable for functional binding; and that the presence of proline reinforces the C-terminal arginine. Given that stable NRP1 binding is crucial for viral uptake, stable interactions should be accounted for in the design of potential drugs and treatment routes to target or disrupt this interface, considering the S1-NRP1 interaction as well as its endogenous VEGF-A ligand that is associated with nociception.
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Affiliation(s)
- Amie Jobe
- Department of Biology, College of Science, United Arab Emirates University, PO Box 15551, Al Ain, United Arab Emirates
| | - Ranjit Vijayan
- Department of Biology, College of Science, United Arab Emirates University, PO Box 15551, Al Ain, United Arab Emirates.,The Big Data Analytics Center, United Arab Emirates University, PO Box 15551, Al Ain, United Arab Emirates
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5
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Neuropilin 1 Regulation of Vascular Permeability Signaling. Biomolecules 2021; 11:biom11050666. [PMID: 33947161 PMCID: PMC8146136 DOI: 10.3390/biom11050666] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 04/24/2021] [Accepted: 04/28/2021] [Indexed: 12/18/2022] Open
Abstract
The vascular endothelium acts as a selective barrier to regulate macromolecule exchange between the blood and tissues. However, the integrity of the endothelium barrier is compromised in an array of pathological settings, including ischemic disease and cancer, which are the leading causes of death worldwide. The resulting vascular hyperpermeability to plasma molecules as well as leukocytes then leads to tissue damaging edema formation and inflammation. The vascular endothelial growth factor A (VEGFA) is a potent permeability factor, and therefore a desirable target for impeding vascular hyperpermeability. However, VEGFA also promotes angiogenesis, the growth of new blood vessels, which is required for reperfusion of ischemic tissues. Moreover, edema increases interstitial pressure in poorly perfused tumors, thereby affecting the delivery of therapeutics, which could be counteracted by stimulating the growth of new functional blood vessels. Thus, targets must be identified to accurately modulate the barrier function of blood vessels without affecting angiogenesis, as well as to develop more effective pro- or anti-angiogenic therapies. Recent studies have shown that the VEGFA co-receptor neuropilin 1 (NRP1) could be playing a fundamental role in steering VEGFA-induced responses of vascular endothelial cells towards angiogenesis or vascular permeability. Moreover, NRP1 is involved in mediating permeability signals induced by ligands other than VEGFA. This review therefore focuses on current knowledge on the role of NRP1 in the regulation of vascular permeability signaling in the endothelium to provide an up-to-date landscape of the current knowledge in this field.
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The role of semaphorins in small vessels of the eye and brain. Pharmacol Res 2020; 160:105044. [PMID: 32590102 DOI: 10.1016/j.phrs.2020.105044] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 06/19/2020] [Accepted: 06/19/2020] [Indexed: 12/20/2022]
Abstract
Small vessel diseases, such as ischemic retinopathy and cerebral small vessel disease (CSVD), are increasingly recognized in patients with diabetes, dementia and cerebrovascular disease. The mechanisms of small vessel diseases are poorly understood, but the latest studies suggest a role for semaphorins. Initially identified as axon guidance cues, semaphorins are mainly studied in neuronal morphogenesis, neural circuit assembly, and synapse assembly and refinement. In recent years, semaphorins have been found to play important roles in regulating vascular growth and development and in many pathophysiological processes, including atherosclerosis, angiogenesis after stroke and retinopathy. Growing evidence indicates that semaphorins affect the occurrence, perfusion and regression of both the macrovasculature and microvasculature by regulating the proliferation, apoptosis, migration, barrier function and inflammatory response of endothelial cells, vascular smooth muscle cells (VSMCs) and pericytes. In this review, we concentrate on the regulatory effects of semaphorins on the cell components of the vessel wall and their potential roles in microvascular diseases, especially in the retina and cerebral small vessel. Finally, we discuss potential molecular approaches in targeting semaphorins as therapies for microvascular disorders in the eye and brain.
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7
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Said AM, Parker MW, Vander Kooi CW. Design, synthesis, and evaluation of a novel benzamidine-based inhibitor of VEGF-C binding to Neuropilin-2. Bioorg Chem 2020; 100:103856. [PMID: 32344185 DOI: 10.1016/j.bioorg.2020.103856] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 03/11/2020] [Accepted: 04/14/2020] [Indexed: 12/11/2022]
Abstract
The Neuropilin (Nrp) family of cell surface receptors have key physiological and pathological functions. Nrp2 is of particular interest due to its involvement in tumor metastasis. Currently, peptide and small molecule inhibitors that target Nrp utilize arginine-based molecules which have limitations due to high inherent flexibility and issues related to stability. Further, there are no known small molecule inhibitors specific for Nrp2. Recent molecular insights identify a key ligand binding region in the b1 domain of Nrp2 responsible for binding the C-terminus of its cognate ligand VEGF-C. Based on this, we report the discovery of a novel benzamidine-based inhibitor that functions through competitive inhibition of VEGF-C binding to Nrp2. Further, we have explored inhibitor functionality and selectivity by defining its structure-activity relationship (SAR) providing valuable insights on this benzamidine-based family of Nrp2 inhibitors. This study provides the basis for further development of a potent and specific small molecule inhibitor that competitively targets pathological Nrp2 function.
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Affiliation(s)
- Ahmed M Said
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY, 14260, United States; Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Helwan University, Ein-Helwan, Helwan, Cairo 11795, Egypt.
| | - Matthew W Parker
- Department of Molecular and Cellular Biochemistry, Center for Structural Biology, University of Kentucky, Lexington, KY 40536, United States
| | - Craig W Vander Kooi
- Department of Molecular and Cellular Biochemistry, Center for Structural Biology, University of Kentucky, Lexington, KY 40536, United States.
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8
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Dallatomasina A, Gasparri AM, Colombo B, Sacchi A, Bianco M, Daniele T, Esposito A, Pastorino F, Ponzoni M, Marcucci F, Curnis F, Corti A. Spatiotemporal Regulation of Tumor Angiogenesis by Circulating Chromogranin A Cleavage and Neuropilin-1 Engagement. Cancer Res 2019; 79:1925-1937. [PMID: 30796053 DOI: 10.1158/0008-5472.can-18-0289] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 08/08/2018] [Accepted: 02/15/2019] [Indexed: 11/16/2022]
Abstract
The unbalanced production of pro- and antiangiogenic factors in tumors can lead to aberrant vasculature morphology, angiogenesis, and disease progression. In this study, we report that disease progression in various murine models of solid tumors is associated with increased cleavage of full-length chromogranin A (CgA), a circulating vasoregulatory neurosecretory protein. Cleavage of CgA led to the exposure of the highly conserved PGPQLR site, which corresponds to residues 368-373 of human CgA1-373, a fragment that has proangiogenic activity. Antibodies against this site, unable to bind full-length CgA, inhibited angiogenesis and reduced tumor perfusion and growth. The PGPQLR sequence of the fragment, but not of the precursor, bound the VEGF-binding site of neuropilin-1; the C-terminal arginine (R373) of the sequence was crucial for binding. The proangiogenic activity of the CgA1-373 was blocked by anti-neuropilin-1 antibodies as well as by nicotinic acetylcholine receptor antagonists, suggesting that these receptors, in addition to neuropilin-1, play a role in the proangiogenic activity of CgA1-373. The R373 residue was enzymatically removed in plasma, causing loss of neuropilin-1 binding and gain of antiangiogenic activity. These results suggest that cleavage of the R373R374 site of circulating human CgA in tumors and the subsequent removal of R373 in the blood represent an important "on/off" switch for the spatiotemporal regulation of tumor angiogenesis and may serve as a novel therapeutic target. SIGNIFICANCE: This work reveals that the interaction between fragmented chromogranin A and neuropilin-1 is required for tumor growth and represents a novel potential therapeutic target.
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Affiliation(s)
| | - Anna Maria Gasparri
- Tumor Biology and Vascular Targeting Unit, Division of Experimental Oncology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Barbara Colombo
- Tumor Biology and Vascular Targeting Unit, Division of Experimental Oncology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Angelina Sacchi
- Tumor Biology and Vascular Targeting Unit, Division of Experimental Oncology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Mimma Bianco
- Tumor Biology and Vascular Targeting Unit, Division of Experimental Oncology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Tiziana Daniele
- Experimental Imaging Center, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Antonio Esposito
- San Raffaele Vita-Salute University, Milan, Italy.,Experimental Imaging Center, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Fabio Pastorino
- Laboratory of Experimental Therapy in Oncology, Istituto Giannina Gaslini, Genoa, Italy
| | - Mirco Ponzoni
- Laboratory of Experimental Therapy in Oncology, Istituto Giannina Gaslini, Genoa, Italy
| | - Fabrizio Marcucci
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy
| | - Flavio Curnis
- Tumor Biology and Vascular Targeting Unit, Division of Experimental Oncology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Angelo Corti
- San Raffaele Vita-Salute University, Milan, Italy. .,Tumor Biology and Vascular Targeting Unit, Division of Experimental Oncology, IRCCS San Raffaele Scientific Institute, Milan, Italy
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9
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Zhang H, Vreeken D, Bruikman CS, van Zonneveld AJ, van Gils JM. Understanding netrins and semaphorins in mature endothelial cell biology. Pharmacol Res 2018; 137:1-10. [PMID: 30240825 DOI: 10.1016/j.phrs.2018.09.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 09/15/2018] [Accepted: 09/15/2018] [Indexed: 02/07/2023]
Abstract
Netrins and semaphorins are known as neuronal guidance molecules that are important to the facilitate patterning of the nervous system in embryonic development. In recent years, their function has been broadened to guide development in other systems, including the vascular system, where netrins and semaphorins critically contribute to the development of the vascular system. Evidence is accumulating that these guidance cues are also of critical importance in the biology of the mature endothelium by regulating the maintenance of endothelial quiescence. Here we review our current insights into the roles of netrins and semaphorins in endothelial cell survival, self-renewing, barrier function, response to wall shear stress, and control of the vascular tone. We also provide suggestions for future research into the functions of netrins and semaphorins in mature endothelial cell biology.
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Affiliation(s)
- Huayu Zhang
- Department of Internal Medicine, Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, the Netherlands
| | - Dianne Vreeken
- Department of Internal Medicine, Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, the Netherlands
| | - Caroline S Bruikman
- Amsterdam UMC, University of Amsterdam, Department of Vascular Medicine, Amsterdam Cardiovascular Sciences, Meibergdreef 9, Amsterdam, the Netherlands
| | - Anton Jan van Zonneveld
- Department of Internal Medicine, Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, the Netherlands
| | - Janine M van Gils
- Department of Internal Medicine, Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, the Netherlands.
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10
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Butti R, Kumar TV, Nimma R, Kundu GC. Impact of semaphorin expression on prognostic characteristics in breast cancer. BREAST CANCER-TARGETS AND THERAPY 2018; 10:79-88. [PMID: 29910635 PMCID: PMC5987790 DOI: 10.2147/bctt.s135753] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Breast cancer is one of the major causes of cancer-related deaths among women worldwide. Aberrant regulation of various growth factors, cytokines, and other proteins and their receptors in cancer cells drives the activation of various oncogenic signaling pathways that lead to cancer progression. Semaphorins are a class of proteins which are differentially expressed in various types of cancer including breast cancer. Earlier, these proteins were known to have a major function in the nerve cell adhesion, migration, and development of the central nervous system. However, their role in the regulation of several aspects of tumor progression has eventually emerged. There are over 30 genes encoding the semaphorins, which are divided into eight subclasses. It has been reported that some members of semaphorin classes are antiangiogenic and antimetastatic in nature, whereas others act as proangiogenic and prometastatic genes. Because of their differential expression and role in angiogenesis and metastasis, semaphorins emerged as one of the important prognostic factors for appraising breast cancer progression.
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Affiliation(s)
- Ramesh Butti
- Laboratory of Tumor Biology, Angiogenesis and Nanomedicine Research, National Centre for Cell Science, Savitribai Phule Pune University, Pune, India
| | - Totakura Vs Kumar
- Laboratory of Tumor Biology, Angiogenesis and Nanomedicine Research, National Centre for Cell Science, Savitribai Phule Pune University, Pune, India
| | - Ramakrishna Nimma
- Laboratory of Tumor Biology, Angiogenesis and Nanomedicine Research, National Centre for Cell Science, Savitribai Phule Pune University, Pune, India
| | - Gopal C Kundu
- Laboratory of Tumor Biology, Angiogenesis and Nanomedicine Research, National Centre for Cell Science, Savitribai Phule Pune University, Pune, India
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11
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Kusunoki H, Tanaka T, Kohno T, Matsuhashi K, Hosoda K, Wakamatsu K, Hamaguchi I. A novel neuropilin-1-binding sequence in the human T-cell lymphotropic virus type 1 envelope glycoprotein. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2018; 1866:541-548. [PMID: 29458191 DOI: 10.1016/j.bbapap.2018.02.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 02/13/2018] [Accepted: 02/15/2018] [Indexed: 12/25/2022]
Abstract
Entry of human T-cell lymphotropic virus type 1 (HTLV-1) into host cells is mainly mediated by interactions between the viral envelope glycoprotein surface unit (SU) and three host receptors: glucose transporter type 1, heparin/heparan sulfate proteoglycan, and neuropilin-1 (Nrp1). Here, we analyzed the interaction between HTLV-1 SU and Nrp1 using nuclear magnetic resonance and isothermal titration calorimetry. We found that two SU peptides, residues 85-94 and residues 304-312, bound directly to the Nrp1 b1 domain with affinities of 7.4 and 17.7 μM, respectively. The binding modes of both peptides were almost identical to those observed for Tuftsin and vascular endothelial growth factor A binding to the Nrp1 b1 domain. These results suggest that the C-terminal region of HTLV-1 SU contains a novel site for direct binding of virus to the Nrp1 b1 domain. Our biophysical characterization of the SU peptides may help in developing inhibitors of HTLV-1 entry.
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Affiliation(s)
- Hideki Kusunoki
- Department of Safety Research on Blood and Biological Products, National Institute of Infectious Diseases, 4-7-1 Gakuen, Musashimurayama, Tokyo 208-0011, Japan.
| | - Toshiyuki Tanaka
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan; Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Toshiyuki Kohno
- Department of Biochemistry, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0374, Japan
| | - Kazuhiko Matsuhashi
- Department of Safety Research on Blood and Biological Products, National Institute of Infectious Diseases, 4-7-1 Gakuen, Musashimurayama, Tokyo 208-0011, Japan; Department of Pediatrics, The Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8666, Japan
| | - Kazuo Hosoda
- Department of Chemistry and Chemical Biology, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan
| | - Kaori Wakamatsu
- Department of Chemistry and Chemical Biology, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan
| | - Isao Hamaguchi
- Department of Safety Research on Blood and Biological Products, National Institute of Infectious Diseases, 4-7-1 Gakuen, Musashimurayama, Tokyo 208-0011, Japan.
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12
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Meng PP, Li Z, Wang SY, Zhou WW, Samiullah M, Chen N, Luo FH, Wu T, Yan JH. Preparation, Purification, and Identification of a Monoclonal Antibody Against the C-Terminal Domain of Semaphorin3F. Monoclon Antib Immunodiagn Immunother 2018; 37:52-58. [PMID: 29420136 DOI: 10.1089/mab.2017.0040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Class three semaphorins were originally identified as mediators of axon guidance, which repelled axons and collapsed growth cones. As a member of class three semaphorins, semaphorin3F (Sema3F) has been found to have similar effects on tumor cells and endothelial cells and also is implicated in the signaling of tumor metastasis by forming a complex with neuropilins and plexins. In this study, our laboratory produced a monoclonal antibody against the C-terminal domain of Sema3F (Sema3Fc mAb) using the hybridoma method, expecting to explore the potential role of the antibody and its application in the detection of Sema3F. The capture enzyme-linked immunosorbent assay (ELISA) method indicated that mAb belonged to the IgM subclass and purified Sema3Fc mAb had a titer of 5.12 × 105 against Sema3Fc by indirect ELISA. In addition, results showed that the Sema3Fc mAb could be applied in such experiments as Western blotting, flow cytometry, immunofluorescence, and immunocytochemical staining. It indicates the Sema3Fc mAb is available in the detection of Sema3F with specificity and will help further study the role and mechanism of Sema3F among tumor cells.
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Affiliation(s)
- Pei-Pei Meng
- Cancer Research Center, Medical College, Xiamen University , Xiangan South Road, Xiamen, Fujian, China
| | - Zhe Li
- Cancer Research Center, Medical College, Xiamen University , Xiangan South Road, Xiamen, Fujian, China
| | - Sheng-Yu Wang
- Cancer Research Center, Medical College, Xiamen University , Xiangan South Road, Xiamen, Fujian, China
| | - Wen-Wen Zhou
- Cancer Research Center, Medical College, Xiamen University , Xiangan South Road, Xiamen, Fujian, China
| | - Malik Samiullah
- Cancer Research Center, Medical College, Xiamen University , Xiangan South Road, Xiamen, Fujian, China
| | - Na Chen
- Cancer Research Center, Medical College, Xiamen University , Xiangan South Road, Xiamen, Fujian, China
| | - Fang-Hong Luo
- Cancer Research Center, Medical College, Xiamen University , Xiangan South Road, Xiamen, Fujian, China
| | - Ting Wu
- Cancer Research Center, Medical College, Xiamen University , Xiangan South Road, Xiamen, Fujian, China
| | - Jiang-Hua Yan
- Cancer Research Center, Medical College, Xiamen University , Xiangan South Road, Xiamen, Fujian, China
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13
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Baek DS, Kim JH, Kim YJ, Kim YS. Immunoglobulin Fc-Fused Peptide without C-Terminal Arg or Lys Residue Augments Neuropilin-1-Dependent Tumor Vascular Permeability. Mol Pharm 2017; 15:394-402. [PMID: 29232521 DOI: 10.1021/acs.molpharmaceut.7b00761] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Neuropilin-1 (NRP1), which functions as a coreceptor for vascular endothelial growth factor (VEGF) and is implicated in vascular permeability and tumorigenesis, has been targeted by peptides that specifically bind to the VEGF-binding region on NRP1. Like natural VEGF ligands, all known peptides with NRP1-binding activity bind only through a carboxy (C)-terminal R/K-x-x-R/K sequence motif (x stands for any amino acids); this strict requirement is called the C-end rule (CendR). Here, we report immunoglobulin Fc-fused NRP1-specific peptides deviating from CendR. We screened a yeast surface-displayed Fc-fused non-CendR peptide library against NRP1 and isolated Fc-V12, wherein V12 peptide comprising 12 amino acids has a PPRV sequence at its C-terminal end. Although Fc-V12 lacked the CendR motif, it showed selective binding to the VEGF-binding region of NRP1 and triggered cellular internalization of NRP1, which resulted in enhanced extravasation into tumor tissues and tumor tissue penetration of the Fc-fused peptide along with the coinjected chemical drug in tumor-bearing mice. Through a saturation mutagenesis study, we identified that the Val residue at the C-terminus of Fc-V12 is crucial for NRP1 binding. We further improved NRP1 affinity of Fc-V12 (KD = ∼761 nM) through directed evolution of the upstream sequence of PPRV to obtain Fc-V12-33 (KD = ∼17.4 nM), which exhibited enhanced NRP1-mediated vascular permeability as compared with Fc-V12. Our results provide functional Fc-fused non-CendR peptides, which bind to the VEGF-binding region of NRP1 and enhance vascular permeability, expanding the sequence space of NRP1-targeting peptides.
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Affiliation(s)
- Du-San Baek
- Department of Molecular Science and Technology, Ajou University , Suwon 16499, Republic of Korea
| | - Jeong-Ho Kim
- Department of Molecular Science and Technology, Ajou University , Suwon 16499, Republic of Korea
| | - Ye-Jin Kim
- Department of Molecular Science and Technology, Ajou University , Suwon 16499, Republic of Korea
| | - Yong-Sung Kim
- Department of Molecular Science and Technology, Ajou University , Suwon 16499, Republic of Korea
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14
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Abstract
The semaphorins are an essential family of axon guidance molecules that can be either secreted or are transmembrane proteins. Class 3 semaphorin (Sema3) family members are secreted and provide long-range guidance cues through two receptor families: neuropilins (Nrp) and plexins. Nrp is uniquely required for high-affinity Sema3 binding and signaling. Therefore, characterizing the molecular details of the Sema3/Nrp interaction is important for understanding the broader physiological and pathological role of the Sema3 family of proteins. Here we describe an in vitro plate-based binding assay for characterization of the Sema3/Nrp interaction. This assay utilizes Nrp-affinity plates and an alkaline phosphatase (AP)-Sema3 fusion to rapidly measure direct Sema3/Nrp binding. This assay can be used to measure receptor-ligand binding, the contribution of different domains, and exogenous factors, and to characterize competitive ligand binding.
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15
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Abstract
Axon guidance relies on a combinatorial code of receptor and ligand interactions that direct adhesive/attractive and repulsive cellular responses. Recent structural data have revealed many of the molecular mechanisms that govern these interactions and enabled the design of sophisticated mutant tools to dissect their biological functions. Here, we discuss the structure/function relationships of four major classes of guidance cues (ephrins, semaphorins, slits, netrins) and examples of morphogens (Wnt, Shh) and of cell adhesion molecules (FLRT). These cell signaling systems rely on specific modes of receptor-ligand binding that are determined by selective binding sites; however, defined structure-encoded receptor promiscuity also enables cross talk between different receptor/ligand families and can also involve extracellular matrix components. A picture emerges in which a multitude of highly context-dependent structural assemblies determines the finely tuned cellular behavior required for nervous system development.
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Affiliation(s)
- Elena Seiradake
- Department of Biochemistry, Oxford University, Oxford OX1 3QU, United Kingdom;
| | - E Yvonne Jones
- Wellcome Trust Centre for Human Genetics, Oxford University, Oxford OX3 7BN, United Kingdom;
| | - Rüdiger Klein
- Max Planck Institute of Neurobiology, 82152 Munich-Martinsried, Germany;
- Munich Cluster for Systems Neurology (SyNergy), 81377 Munich, Germany
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16
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Yang WJ, Hu J, Uemura A, Tetzlaff F, Augustin HG, Fischer A. Semaphorin-3C signals through Neuropilin-1 and PlexinD1 receptors to inhibit pathological angiogenesis. EMBO Mol Med 2016. [PMID: 26194913 PMCID: PMC4604683 DOI: 10.15252/emmm.201404922] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Retinopathy of prematurity causes visual impairment due to destructive neoangiogenesis after degeneration of the retinal microvasculature. This study was aimed at analyzing whether local delivery of Semaphorin-3C (Sema3C) suppresses pathological retinal angiogenesis. Sema3C exerted potent inhibiting effects in cellular models of angiogenesis. In an endothelial cell xenotransplantation assay, Sema3C acted primarily on immature microvessels by inducing endothelial cell apoptosis. Intravitreal administration of recombinant Sema3C disrupted endothelial tip cell formation and cell–cell contacts, which led to decreased vascular bed expansion and vessel branching in the growing retinal vasculature of newborn mice, while not affecting mature vessels in the adult retina. Sema3C administration strongly inhibited the formation of pathological pre-retinal vascular tufts during oxygen-induced retinopathy. Mechanistically, Sema3C signaled through the receptors Neuropilin-1 and PlexinD1, which were strongly expressed on vascular tufts, induced VE-cadherin internalization, and abrogated vascular endothelial growth factor (VEGF)-induced activation of the kinases AKT, FAK, and p38MAPK. This disrupted endothelial cell junctions, focal adhesions, and cytoskeleton assembly resulted in decreased cell migration and survival. Thus, this study identified Sema3C as a potent and selective inhibitor of pathological retinal angiogenesis.
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Affiliation(s)
- Wan-Jen Yang
- Vascular Signaling and Cancer (A270), German Cancer Research Center (DKFZ-ZMBH Alliance), Heidelberg, Germany Vascular Biology and Tumor Angiogenesis, Medical Faculty Mannheim (CBTM) Heidelberg University, Mannheim, Germany
| | - Junhao Hu
- Vascular Oncology and Metastasis (A190), German Cancer Research Center (DKFZ-ZMBH Alliance), Heidelberg, Germany
| | - Akiyoshi Uemura
- Department of Retinal Vascular Biology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Fabian Tetzlaff
- Vascular Signaling and Cancer (A270), German Cancer Research Center (DKFZ-ZMBH Alliance), Heidelberg, Germany
| | - Hellmut G Augustin
- Vascular Biology and Tumor Angiogenesis, Medical Faculty Mannheim (CBTM) Heidelberg University, Mannheim, Germany Vascular Oncology and Metastasis (A190), German Cancer Research Center (DKFZ-ZMBH Alliance), Heidelberg, Germany
| | - Andreas Fischer
- Vascular Signaling and Cancer (A270), German Cancer Research Center (DKFZ-ZMBH Alliance), Heidelberg, Germany Vascular Biology and Tumor Angiogenesis, Medical Faculty Mannheim (CBTM) Heidelberg University, Mannheim, Germany Department of Medicine I and Clinical Chemistry, Heidelberg University, Heidelberg, Germany
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17
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Raimondi C, Brash JT, Fantin A, Ruhrberg C. NRP1 function and targeting in neurovascular development and eye disease. Prog Retin Eye Res 2016; 52:64-83. [PMID: 26923176 PMCID: PMC4854174 DOI: 10.1016/j.preteyeres.2016.02.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 02/08/2016] [Accepted: 02/10/2016] [Indexed: 12/19/2022]
Abstract
Neuropilin 1 (NRP1) is expressed by neurons, blood vessels, immune cells and many other cell types in the mammalian body and binds a range of structurally and functionally diverse extracellular ligands to modulate organ development and function. In recent years, several types of mouse knockout models have been developed that have provided useful tools for experimental investigation of NRP1 function, and a multitude of therapeutics targeting NRP1 have been designed, mostly with the view to explore them for cancer treatment. This review provides a general overview of current knowledge of the signalling pathways that are modulated by NRP1, with particular focus on neuronal and vascular roles in the brain and retina. This review will also discuss the potential of NRP1 inhibitors for the treatment for neovascular eye diseases.
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Affiliation(s)
- Claudio Raimondi
- UCL Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK
| | - James T Brash
- UCL Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK
| | - Alessandro Fantin
- UCL Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK
| | - Christiana Ruhrberg
- UCL Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK.
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18
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Pang HB, Braun GB, Ruoslahti E. Neuropilin-1 and heparan sulfate proteoglycans cooperate in cellular uptake of nanoparticles functionalized by cationic cell-penetrating peptides. SCIENCE ADVANCES 2015; 1:e1500821. [PMID: 26601141 PMCID: PMC4640594 DOI: 10.1126/sciadv.1500821] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 09/03/2015] [Indexed: 05/23/2023]
Abstract
Cell-penetrating peptides (CPPs) have been widely used to deliver nanomaterials and other types of macromolecules into mammalian cells for therapeutic and diagnostic use. Cationic CPPs that bind to heparan sulfate (HS) proteoglycans on the cell surface induce potent endocytosis; however, the role of other surface receptors in this process is unclear. We describe the convergence of an HS-dependent pathway with the C-end rule (CendR) mechanism that enables peptide ligation with neuropilin-1 (NRP1), a cell surface receptor known to be involved in angiogenesis and vascular permeability. NRP1 binds peptides carrying a positive residue at the carboxyl terminus, a feature that is compatible with cationic CPPs, either intact or after proteolytic processing. We used CPP and CendR peptides, as well as HS- and NRP1-binding motifs from semaphorins, to explore the commonalities and differences of the HS and NRP1 pathways. We show that the CendR-NRP1 interaction determines the ability of CPPs to induce vascular permeability. We also show at the ultrastructural level, using a novel cell entry synchronization method, that both the HS and NRP1 pathways can initiate a macropinocytosis-like process and visualize these CPP-cargo complexes going through various endosomal compartments. Our results provide new insights into how CPPs exploit multiple surface receptor pathways for intracellular delivery.
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Affiliation(s)
- Hong-Bo Pang
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, 10901 N. Torrey Pines Road, La Jolla, CA 92037, USA
| | - Gary B. Braun
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, 10901 N. Torrey Pines Road, La Jolla, CA 92037, USA
- Center for Nanomedicine and Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106–9610, USA
| | - Erkki Ruoslahti
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, 10901 N. Torrey Pines Road, La Jolla, CA 92037, USA
- Center for Nanomedicine and Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106–9610, USA
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19
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Li X, Parker MW, Vander Kooi CW. Control of cellular motility by neuropilin-mediated physical interactions. Biomol Concepts 2015; 5:157-66. [PMID: 25018786 DOI: 10.1515/bmc-2013-0035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The neuropilin (Nrp) family consists of multifunctional cell surface receptors with critical roles in a number of different cell and tissue types. A core aspect of Nrp function is in ligand-dependent cellular migration, where it controls the multistep process of cellular motility through integration of ligand binding and receptor signaling. At a molecular level, the role of Nrp in migration is intimately connected to the control of adhesive interactions and cytoskeletal reorganization. Here, we review the physiological role of Nrp in cellular adhesion and motility in the cardiovascular and nervous systems. We also discuss the emerging pathological role of Nrp in tumor cell migration and metastasis, providing motivation for continued efforts toward developing Nrp inhibitors.
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20
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Guo HF, Vander Kooi CW. Neuropilin Functions as an Essential Cell Surface Receptor. J Biol Chem 2015; 290:29120-6. [PMID: 26451046 DOI: 10.1074/jbc.r115.687327] [Citation(s) in RCA: 149] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The Neuropilins (Nrps) are a family of essential cell surface receptors involved in multiple fundamental cellular signaling cascades. Nrp family members have key functions in VEGF-dependent angiogenesis and semaphorin-dependent axon guidance, controlling signaling and cross-talk between these fundamental physiological processes. More recently, Nrp function has been found in diverse signaling and adhesive functions, emphasizing their role as pleiotropic co-receptors. Pathological Nrp function has been shown to be important in aberrant activation of both canonical and alternative pathways. Here we review key recent insights into Nrp function in human health and disease.
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Affiliation(s)
- Hou-Fu Guo
- From the Department of Molecular and Cellular Biochemistry and Center for Structural Biology, University of Kentucky, Lexington, Kentucky 40536
| | - Craig W Vander Kooi
- From the Department of Molecular and Cellular Biochemistry and Center for Structural Biology, University of Kentucky, Lexington, Kentucky 40536
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21
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Kim YJ, Bae J, Shin TH, Kang SH, Jeong M, Han Y, Park JH, Kim SK, Kim YS. Immunoglobulin Fc-fused, neuropilin-1-specific peptide shows efficient tumor tissue penetration and inhibits tumor growth via anti-angiogenesis. J Control Release 2015; 216:56-68. [PMID: 26260451 DOI: 10.1016/j.jconrel.2015.08.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Revised: 07/14/2015] [Accepted: 08/06/2015] [Indexed: 12/15/2022]
Abstract
Neuropilin-1 (NRP1) receptor, involved in vascular endothelial growth factor (VEGF)-mediated vascular permeability and tumor angiogenesis, is targeted by peptides that bind to its VEGF-binding site. However, these peptides also cross-react with the structurally related receptor, NRP2. Here, we describe an immunoglobulin Fc-fused peptide, Fc-TPP11, which specifically binds to the VEGF-binding site of NRP1 with approximately 2nM affinity, but negligibly to that of NRP2. Fc-TPP11 triggered NRP1-dependent signaling, enhanced vascular permeability via vascular endothelial (VE)-cadherin downregulation, and increased paracellular permeability via E-cadherin downregulation in tumor tissues. Fc-TPP11 also significantly enhanced the tumor penetration of co-injected anti-cancer drug, doxorubicin, leading to the improved in vivo anti-tumor efficacy. Fc-TPP11 was easily adapted to the full-length anti-epidermal growth factor receptor (EGFR) monoclonal antibody (mAb) cetuximab (Erbitux), cetuximab-TPP11, exhibiting more than 2-fold improved tumor penetration than the parent cetuximab. Fc-TPP11 exhibited a similar whole-body half-life to that of intact Fc in tumor bearing mice. In addition to the tumor-penetrating activity, Fc-TPP11 suppressed VEGF-dependent angiogenesis by blocking VEGF binding to NRP1, thereby inhibiting tumor growth without promoting metastasis in the mouse model. Our results show that NRP1-specific, high-affinity binding of Fc-TPP11, is useful to validate NRP1 signaling, independent of NRP2. Thus, Fc-TPP11 can be used as a tumor penetration-promoting agent with anti-angiogenic activity or directly adapted to mAb-TPP11 format for more potent anti-cancer antibody therapy.
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Affiliation(s)
- Ye-Jin Kim
- Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Republic of Korea
| | - Jeomil Bae
- Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Republic of Korea
| | - Tae-Hwan Shin
- Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Republic of Korea
| | - Se Hun Kang
- Molecular Imaging & Therapy Branch, National Cancer Center, Goyang 410-769, Republic of Korea
| | - Moonkyoung Jeong
- Department of Bio and Brain Engineering & Center of Optics for Health Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Yunho Han
- Department of Bio and Brain Engineering & Center of Optics for Health Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Ji-Ho Park
- Department of Bio and Brain Engineering & Center of Optics for Health Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Seok-Ki Kim
- Molecular Imaging & Therapy Branch, National Cancer Center, Goyang 410-769, Republic of Korea
| | - Yong-Sung Kim
- Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Republic of Korea.
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22
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Mumblat Y, Kessler O, Ilan N, Neufeld G. Full-Length Semaphorin-3C Is an Inhibitor of Tumor Lymphangiogenesis and Metastasis. Cancer Res 2015; 75:2177-86. [PMID: 25808871 DOI: 10.1158/0008-5472.can-14-2464] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Accepted: 03/13/2015] [Indexed: 11/16/2022]
Abstract
Semaphorins play important regulatory roles in diverse processes such as axon guidance, angiogenesis, and immune responses. We find that semaphorin-3C (sema3C) induces the collapse of the cytoskeleton of lymphatic endothelial cells (LEC) in a neuropilin-2-, plexin-D1-, and plexin-A1-dependent manner, while most other semaphorins, including antiangiogenic semaphorins such as sema3A do not. Sema3C is cleaved, like other class-3 semaphorins, by furin-like pro-protein convertases (FPPC). Cleaved sema3C (p65-Sema3C) was unable to induce the collapse of the cytoskeleton of LEC. FPPC are strongly upregulated in tumor cells. In order to examine the effects of full-length sema3C on tumor progression, we therefore generated an active point mutated furin cleavage-resistant sema3C (FR-sema3C). FR-sema3C inhibited potently proliferation of LEC and to a lesser extent proliferation of human umbilical vein-derived endothelial cells. FR-sema3C also inhibited VEGF-C-induced phosphorylation of VEGFR-3, ERK1/2, and AKT. Expression of recombinant FR-sema3C in metastatic, triple-negative LM2-4 breast cancer cells did not affect their migration or proliferation in vitro. However, tumors derived from FR-sema3C-expressing LM2-4 cells implanted in mammary fat pads developed at a slower rate, contained a lower concentration of blood vessels and lymph vessels, and metastasized much less effectively to lymph nodes. Interestingly, p65-Sema3C, but not FR-sema3C, rendered A549 lung cancer cells resistant to serum deprivation, suggesting that previously reported protumorigenic activities of sema3C may be due to p65-Sema3C produced by tumor cells. Our observations suggest that FR-sema3C may be further developed into a novel antitumorigenic drug.
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Affiliation(s)
- Yelena Mumblat
- Cancer Research and Vascular Biology Center, The Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel
| | - Ofra Kessler
- Cancer Research and Vascular Biology Center, The Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel
| | - Neta Ilan
- Cancer Research and Vascular Biology Center, The Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel
| | - Gera Neufeld
- Cancer Research and Vascular Biology Center, The Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel.
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23
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Parker MW, Linkugel AD, Goel HL, Wu T, Mercurio AM, Vander Kooi CW. Structural basis for VEGF-C binding to neuropilin-2 and sequestration by a soluble splice form. Structure 2015; 23:677-87. [PMID: 25752543 DOI: 10.1016/j.str.2015.01.018] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 01/15/2015] [Accepted: 01/28/2015] [Indexed: 12/21/2022]
Abstract
Vascular endothelial growth factor C (VEGF-C) is a potent lymphangiogenic cytokine that signals via the coordinated action of two cell surface receptors, Neuropilin-2 (Nrp2) and VEGFR-3. Diseases associated with both loss and gain of VEGF-C function, lymphedema and cancer, respectively, motivate studies of VEGF-C/Nrp2 binding and inhibition. Here, we demonstrate that VEGF-C binding to Nrp2 is regulated by C-terminal proteolytic maturation. The structure of the VEGF-C C terminus in complex with the ligand binding domains of Nrp2 demonstrates that a cryptic Nrp2 binding motif is released upon proteolysis, allowing specific engagement with the b1 domain of Nrp2. Based on the identified structural requirements for Nrp2 binding to VEGF-C, we hypothesized that the endogenous secreted splice form of Nrp2, s9Nrp2, may function as a selective inhibitor of VEGF-C. We find that s9Nrp2 forms a stable dimer that potently inhibits VEGF-C/Nrp2 binding and cellular signaling. These data provide critical insight into VEGF-C/Nrp2 binding and inhibition.
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Affiliation(s)
- Matthew W Parker
- Department of Molecular and Cellular Biochemistry, Center for Structural Biology, University of Kentucky, Lexington, KY 40536, USA
| | - Andrew D Linkugel
- Department of Molecular and Cellular Biochemistry, Center for Structural Biology, University of Kentucky, Lexington, KY 40536, USA; Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Hira Lal Goel
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Tingting Wu
- Department of Molecular and Cellular Biochemistry, Center for Structural Biology, University of Kentucky, Lexington, KY 40536, USA
| | - Arthur M Mercurio
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Craig W Vander Kooi
- Department of Molecular and Cellular Biochemistry, Center for Structural Biology, University of Kentucky, Lexington, KY 40536, USA.
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24
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Uversky VN. Unreported intrinsic disorder in proteins: Building connections to the literature on IDPs. INTRINSICALLY DISORDERED PROTEINS 2014; 2:e970499. [PMID: 28232880 PMCID: PMC5314882 DOI: 10.4161/21690693.2014.970499] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 09/08/2014] [Indexed: 02/07/2023]
Abstract
This review opens a new series entitled “Unreported intrinsic disorder in proteins.” The goal of this series is to bring attention of researchers to an interesting phenomenon of missed (or overlooked, or ignored, or unreported) disorder. This series serves as a companion to “Digested Disorder” which provides a quarterly review of papers on intrinsically disordered proteins (IDPs) found by standard literature searches. The need for this alternative series results from the observation that there are numerous publications that describe IDPs (or hybrid proteins with ordered and disordered regions) yet fail to recognize many of the key discoveries and publications in the IDP field. By ignoring the body of work on IDPs, such publications often fail to relate their findings to prior discoveries or fail to explore the obvious implications of their work. Thus, the goal of this series is not only to review these very interesting and important papers, but also to point out how each paper relates to the IDP field and show how common tools in the IDP field can readily take the findings in new directions or provide a broader context for the reported findings.
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Affiliation(s)
- Vladimir N Uversky
- Department of Molecular Medicine and USF Health Byrd Alzheimer's Research Institute; Morsani College of Medicine; University of South Florida; Tampa, FL USA; Institute for Biological Instrumentation; Russian Academy of Sciences; Pushchino, Russia; Biology Department; Faculty of Science; King Abdulaziz University; Jeddah, Kingdom of Saudi Arabia
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25
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Sugahara KN, Braun GB, de Mendoza TH, Kotamraju VR, French RP, Lowy AM, Teesalu T, Ruoslahti E. Tumor-penetrating iRGD peptide inhibits metastasis. Mol Cancer Ther 2014; 14:120-8. [PMID: 25392370 DOI: 10.1158/1535-7163.mct-14-0366] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Tumor-specific tissue-penetrating peptides deliver drugs into extravascular tumor tissue by increasing tumor vascular permeability through interaction with neuropilin (NRP). Here, we report that a prototypic tumor-penetrating peptide iRGD (amino acid sequence: CRGDKGPDC) potently inhibits spontaneous metastasis in mice. The antimetastatic effect was mediated by the NRP-binding RXXK peptide motif (CendR motif), and not by the integrin-binding RGD motif. iRGD inhibited migration of tumor cells and caused chemorepulsion in vitro in a CendR- and NRP-1-dependent manner. The peptide induced dramatic collapse of cellular processes and partial cell detachment, resulting in the repellent activity. These effects were prominently displayed when the cells were seeded on fibronectin, suggesting a role of CendR in functional regulation of integrins. The antimetastatic activity of iRGD may provide a significant additional benefit when this peptide is used for drug delivery to tumors.
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Affiliation(s)
- Kazuki N Sugahara
- Cancer Research Center, Sanford-Burnham Medical Research Institute, La Jolla, California. Department of Surgery, Columbia University College of Physicians and Surgeons, New York, New York.
| | - Gary B Braun
- Cancer Research Center, Sanford-Burnham Medical Research Institute, La Jolla, California. Center for Nanomedicine and Department of Cell, Molecular and Developmental Biology, University of California Santa Barbara, Santa Barbara, California
| | | | | | - Randall P French
- Division of Surgical Oncology and Moores Cancer Center, University of California, San Diego, La Jolla, California
| | - Andrew M Lowy
- Division of Surgical Oncology and Moores Cancer Center, University of California, San Diego, La Jolla, California
| | - Tambet Teesalu
- Cancer Research Center, Sanford-Burnham Medical Research Institute, La Jolla, California. Centre of Excellence for Translational Medicine, University of Tartu, Tartu, Estonia
| | - Erkki Ruoslahti
- Cancer Research Center, Sanford-Burnham Medical Research Institute, La Jolla, California. Center for Nanomedicine and Department of Cell, Molecular and Developmental Biology, University of California Santa Barbara, Santa Barbara, California
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26
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Mecollari V, Nieuwenhuis B, Verhaagen J. A perspective on the role of class III semaphorin signaling in central nervous system trauma. Front Cell Neurosci 2014; 8:328. [PMID: 25386118 PMCID: PMC4209881 DOI: 10.3389/fncel.2014.00328] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 09/29/2014] [Indexed: 01/07/2023] Open
Abstract
Traumatic injury of the central nervous system (CNS) has severe impact on the patients’ quality of life and initiates many molecular and cellular changes at the site of insult. Traumatic CNS injury results in direct damage of the axons of CNS neurons, loss of myelin sheaths, destruction of the surrounding vascular architecture and initiation of an immune response. Class III semaphorins (SEMA3s) are present in the neural scar and influence a wide range of molecules and cell types in and surrounding the injured tissue. SEMA3s and their receptors, neuropilins (NRPs) and plexins (PLXNs) were initially studied because of their involvement in repulsive axon guidance. To date, SEMA3 signaling is recognized to be of crucial importance for re-vascularization, the immune response and remyelination. The purpose of this review is to summarize and discuss how SEMA3s modulate these processes that are all crucial components of the tissue response to injury. Most of the functions for SEMA3s are achieved through their binding partners NRPs, which are also co-receptors for a variety of other molecules implicated in the above processes. The most notable ligands are members of the vascular endothelial growth factor (VEGF) family and the transforming growth factor family. Therefore, a second aim is to highlight the overlapping or competing signaling pathways that are mediated through NRPs in the same processes. In conclusion, we show that the role of SEMA3s goes beyond inhibiting axonal regeneration, since they are also critical modulators of re-vascularization, the immune response and re-myelination.
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Affiliation(s)
- Vasil Mecollari
- Laboratory for Regeneration of Sensorimotor Systems, Netherlands Institute for Neuroscience Amsterdam, Netherlands
| | - Bart Nieuwenhuis
- Laboratory for Regeneration of Sensorimotor Systems, Netherlands Institute for Neuroscience Amsterdam, Netherlands
| | - Joost Verhaagen
- Laboratory for Regeneration of Sensorimotor Systems, Netherlands Institute for Neuroscience Amsterdam, Netherlands ; Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam Amsterdam, Netherlands
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Liu WQ, Borriello L, Allain B, Pavoni S, Lopez N, Hermine O, Garbay C, Raynaud F, Lepelletier Y, Demange L. New Peptides Structurally Related to VEGF-A165 Exon-7 and -8 Encoded Domains Antagonize Its Binding to NRP-1 and VEGF-R1. Int J Pept Res Ther 2014. [DOI: 10.1007/s10989-014-9436-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Aghajanian H, Choi C, Ho VC, Gupta M, Singh MK, Epstein JA. Semaphorin 3d and semaphorin 3e direct endothelial motility through distinct molecular signaling pathways. J Biol Chem 2014; 289:17971-9. [PMID: 24825896 DOI: 10.1074/jbc.m113.544833] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Class 3 semaphorins were initially described as axonal growth cone guidance molecules that signal through plexin and neuropilin coreceptors and since then have been established to be regulators of vascular development. Semaphorin 3e (Sema3e) has been shown previously to repel endothelial cells and is the only class 3 semaphorin known to be capable of signaling via a plexin receptor without a neuropilin coreceptor. Sema3e signals through plexin D1 (Plxnd1) to regulate vascular patterning by modulating the cytoskeleton and focal adhesion structures. We showed recently that semaphorin 3d (Sema3d) mediates endothelial cell repulsion and pulmonary vein patterning during embryogenesis. Here we show that Sema3d and Sema3e affect human umbilical vein endothelial cells similarly but through distinct molecular signaling pathways. Time-lapse imaging studies show that both Sema3d and Sema3e can inhibit cell motility and migration, and tube formation assays indicate that both can impede tubulogenesis. Endothelial cells incubated with either Sema3d or Sema3e demonstrate a loss of actin stress fibers and focal adhesions. However, the addition of neuropilin 1 (Nrp1)-blocking antibody or siRNA knockdown of Nrp1 inhibits Sema3d-mediated, but not Sema3e-mediated, cytoskeletal reorganization, and siRNA knockdown of Nrp1 abrogates Sema3d-mediated, but not Sema3e-mediated, inhibition of tubulogenesis. On the other hand, endothelial cells deficient in Plxnd1 are resistant to endothelial repulsion mediated by Sema3e but not Sema3d. Unlike Sema3e, Sema3d incubation results in phosphorylation of Akt in human umbilical vein endothelial cells, and inhibition of the PI3K/Akt pathway blocks the endothelial guidance and cytoskeletal reorganization functions of Sema3d but not Sema3e.
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Affiliation(s)
- Haig Aghajanian
- From the Department of Cell and Developmental Biology and the Cardiovascular Institute and Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Connie Choi
- From the Department of Cell and Developmental Biology and the Cardiovascular Institute and Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Vivienne C Ho
- From the Department of Cell and Developmental Biology and the Cardiovascular Institute and Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Mudit Gupta
- From the Department of Cell and Developmental Biology and the Cardiovascular Institute and Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Manvendra K Singh
- From the Department of Cell and Developmental Biology and the Cardiovascular Institute and Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Jonathan A Epstein
- From the Department of Cell and Developmental Biology and the Cardiovascular Institute and Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
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Parker MW, Vander Kooi CW. Microplate-based screening for small molecule inhibitors of neuropilin-2/vascular endothelial growth factor-C interactions. Anal Biochem 2014; 453:4-6. [PMID: 24583243 DOI: 10.1016/j.ab.2014.02.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 02/11/2014] [Accepted: 02/17/2014] [Indexed: 11/15/2022]
Abstract
Vascular endothelial growth factor-C (VEGF-C) is a secreted growth factor essential for lymphangiogenesis. VEGF-C functions in both physiological and pathological lymphangiogenesis, particularly in tumor metastasis, making it an attractive therapeutic target. Members of two families of cell surface receptors transduce VEGF-C signals: neuropilin-2 (Nrp2) and VEGF-receptor (VEGFR)-2/3. Nrp2 is a promising target for inhibition because it is highly expressed in lymphatic vessels. Here we describe a microplate-based assay for discovery of VEGF-C/Nrp2 inhibitors. We optimize this assay for use in screening an inhibitor library and identify three novel Nrp2/VEGF-C binding inhibitors from the National Institutes of Health (NIH) Clinical Collection small molecule library.
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Affiliation(s)
- Matthew W Parker
- Center for Structural Biology, Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536, USA
| | - Craig W Vander Kooi
- Center for Structural Biology, Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536, USA.
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Guo HF, Li X, Parker MW, Waltenberger J, Becker PM, Vander Kooi CW. Mechanistic basis for the potent anti-angiogenic activity of semaphorin 3F. Biochemistry 2013; 52:7551-8. [PMID: 24079887 DOI: 10.1021/bi401034q] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Neuropilin-1 (Nrp1), an essential type I transmembrane receptor, binds two secreted ligand families, vascular endothelial growth factor (VEGF) and class III Semaphorin (Sema3). VEGF-A and Sema3F have opposing roles in regulating Nrp1 vascular function in angiogenesis. VEGF-A functions as one of the most potent pro-angiogenic cytokines, while Sema3F is a uniquely potent endogenous angiogenesis inhibitor. Sema3 family members require proteolytic processing by furin to allow competitive binding to Nrp1. We demonstrate that the furin-processed C-terminal domain of Sema3F (C-furSema) potently inhibits VEGF-A-dependent activation of endothelial cells. We find that this potent activity is due to unique heterobivalent engagement of Nrp1 by two distinct sites in the C-terminal domain of Sema3F. One of the sites is the C-terminal arginine, liberated by furin cleavage, and the other is a novel upstream helical motif centered on the intermolecular disulfide. Using a novel chimeric C-furSema, we demonstrate that combining a single C-terminal arginine with the helical motif is necessary and sufficient for potent inhibition of binding of VEGF-A to Nrp1. We further demonstrate that the multiple furin-processed variants of Sema3A, with the altered proximity of the two binding motifs, have dramatically different potencies. This suggests that furin processing not only switches Sema3 to an activated form but also, depending on the site processed, can also tune potency. These data establish the basis for potent competitive binding of Sema3 to Nrp1 and provide a basis for the design of bivalent Nrp inhibitors.
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Affiliation(s)
- Hou-Fu Guo
- Department of Molecular and Cellular Biochemistry, Center for Structural Biology, University of Kentucky , Lexington, Kentucky 40536, United States
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