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Gianvincenzo PD, Calvo J, Perez S, Álvarez A, Bedoya LM, Alcamí J, Penadés S. Negatively charged glyconanoparticles modulate and stabilize the secondary structures of a gp120 V3 loop peptide: toward fully synthetic HIV vaccine candidates. Bioconjug Chem 2015; 26:755-65. [PMID: 25734507 DOI: 10.1021/acs.bioconjchem.5b00077] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The third variable region (V3 peptide) of the HIV-1 gp120 is a major immunogenic domain of HIV-1. Controlling the formation of the immunologically active conformation is a crucial step to the rational design of fully synthetic candidate vaccines. Herein, we present the modulation and stabilization of either the α-helix or β-strand conformation of the V3 peptide by conjugation to negatively charged gold glyconanoparticles (GNPs). The formation of the secondary structure can be triggered by the variation of the buffer concentration and/or pH as indicated by circular dichoism. The peptide on the GNPs shows increased stability toward peptidase degradation as compared to the free peptide. Moreover, only the V3β-GNPs bind to the anti-V3 human broadly neutralizing mAb 447-52D as demonstrated by surface plasmon resonance (SPR). The strong binding of V3β-GNPs to the 447-52D mAb was the starting point to address its study as immunogen. V3β-GNPs elicit antibodies in rabbits that recognize a recombinant gp120 and the serum displayed low but consistent neutralizing activity. These results open up the way for the design of new fully synthetic HIV vaccine candidates.
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Affiliation(s)
| | | | - Serge Perez
- ∥Département de Pharmacochimie, UMR 5063 CNRS-Université Grenoble Alpes, BP53, 38041, Grenoble cédex 09, France
| | - Amparo Álvarez
- ⊥Aids Immunopathology Unit, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Ctra Pozuelo Km. 2, 28220, Majadahonda, Madrid, Spain
| | - Luis Miguel Bedoya
- ⊥Aids Immunopathology Unit, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Ctra Pozuelo Km. 2, 28220, Majadahonda, Madrid, Spain.,#Pharmacology Department, Pharmacy Faculty, Universidad Complutense de Madrid. Pz. Ramón Y Cajal, 28040, Madrid, Spain
| | - José Alcamí
- ⊥Aids Immunopathology Unit, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Ctra Pozuelo Km. 2, 28220, Majadahonda, Madrid, Spain
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Wang YT, Su ZY. Modelling and predicting the binding mechanics of HIV P1053-0.5β antibody complex. MOLECULAR SIMULATION 2011. [DOI: 10.1080/08927022.2010.533274] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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In vivo CXCR4 expression, lymphoid cell phenotype, and feline immunodeficiency virus infection. Vet Immunol Immunopathol 2008; 123:97-105. [PMID: 18295345 DOI: 10.1016/j.vetimm.2008.01.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Primary isolates of feline immunodeficiency virus (FIV) appear to require binding to CD134 in conjunction with CXCR4(X4) to infect IL-2-dependent T-cell-derived cells in culture. However, much less is known about the role of X4 for the infection of cells in vivo. To investigate the correlation between X4 expression and FIV infection in cats acutely infected with FIV-C-Pgmr we used high-speed fluorescence-activated cell sorting and realtime PCR to co-analyze cell phenotypes from lymph node, thymus, bone marrow and blood for FIV infection and X4 expression. X4 expression was greatest in lymph node, both in frequency and in mean fluorescence intensity. The thymus demonstrated a higher proviral burden in X4+ thymic T cells ( approximately 14% in X4+ thymic T cells and 7% in X4- cells) whereas, proviral loads were similar between X4+ and X4- cell populations in all other tissues examined. Assuming a minimum of one proviral copy per cell, a maximum of approximately 50% of FIV-positive cells were X4+. The highest fraction of FIV-infected X4- cells was present in bone marrow. Regardless of X4 status, proviral loads were higher in lymph node and blood T cells than in B cells. These studies provide both a positive association between X4 expression and FIV infection and introduce the probability that X4-independent infection occurs in other target cells in vivo.
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Slimani H, Charnaux N, Mbemba E, Saffar L, Vassy R, Vita C, Gattegno L. Interaction of RANTES with syndecan-1 and syndecan-4 expressed by human primary macrophages. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2004; 1617:80-8. [PMID: 14637022 DOI: 10.1016/j.bbamem.2003.09.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Interaction of RANTES with its membrane ligands or receptors transduces multiple intracellular signals. Whether RANTES uses proteoglycans (PGs) belonging to the syndecan family to attach to primary cells expressing RANTES G-protein-coupled receptors (GPCRs) was investigated. We demonstrate that RANTES specifically binds to high and low affinity binding sites on human monocyte-derived macrophages (MDM). We show by co-immunoprecipitation experiments that RANTES is associated on these cells with syndecan-1 and syndecan-4, but neither with syndecan-2 nor with betaglycan, in addition to CD44 and its GPCRs, CCR5 and CCR1. Glycosaminidases pre-treatment of the monocyte derived-macrophages strongly decreases the binding of RANTES to syndecan-1 and syndecan-4 and also to CCR5, and abolishes RANTES binding to CD44. This suggests that glycosaminoglycans (GAGs) are involved in RANTES binding to the PGs and that such bindings facilitate the subsequent interaction of RANTES with CCR5, on the MDM, characterized by low membrane expression of CCR5. The role of these interactions in the pathophysiology of RANTES deserves further study.
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Affiliation(s)
- Hocine Slimani
- UPRES 3410, UFR-SMBH, Université Paris XIII, 74 rue Marcel Cachin, Hôpital Jean Verdier, 93017 Bondy, Bobigny, France
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Savarino A, Bensi T, Chiocchetti A, Bottarel F, Mesturini R, Ferrero E, Calosso L, Deaglio S, Ortolan E, Buttò S, Cafaro A, Katada T, Ensoli B, Malavasi F, Dianzani U. Human CD38 interferes with HIV-1 fusion through a sequence homologous to the V3 loop of the viral envelope glycoprotein gp120. FASEB J 2003; 17:461-3. [PMID: 12551845 DOI: 10.1096/fj.02-0512fje] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
CD38 is a progression marker in HIV-1 infection, it displays lateral association with CD4, and down-modulates gp120/CD4 binding. The aim of this study was to elucidate the mechanism behind the interplay between CD4, CD38, and HIV-1. We used mouse cell transfectants expressing human CD4 and either CD38 or other CD4-associated molecules to show that CD38 specifically inhibits gp120/CD4 binding. Human cell transfectants expressing truncated forms of CD38 and bioinformatic analysis were used to map the anti-HIV activity and show that it is concentrated in the membrane-proximal region. This region displayed significant sequence-similarity with the V3 loop of the HIV-1 gp120 glycoprotein. In line with this similarity, synthetic soluble peptides derived from this region reproduced the anti-HIV effects of full-length CD38 and inhibited HIV-1 and HIV-2 primary isolates from different subtypes and with different coreceptor use. A multiple-branched peptide construct presenting part of the sequence of the V3-like region potently and selectively inhibited HIV-1 replication in the nanomolar range. Conversely, a deletion in the V3-like region abrogated the anti-HIV-1 activity of CD38 and its lateral association with CD4. These findings may provide new insights into the early events of HIV-1 fusion and strategies to intervene.
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Affiliation(s)
- Andrea Savarino
- Laboratory of Immunology, Interdisciplinary Research Center of Autoimmune Diseases, Department of Medical Science, University of Eastern Piedmont, Novara, Italy.
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Atemezem A, Mbemba E, Marfaing R, Vaysse J, Pontet M, Saffar L, Charnaux N, Gattegno L. Human alpha-fetoprotein binds to primary macrophages. Biochem Biophys Res Commun 2002; 296:507-14. [PMID: 12176010 DOI: 10.1016/s0006-291x(02)00909-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We have previously reported that alpha-fetoprotein (AFP) inhibits infection of human monocyte-derived macrophages (MDM) by R5-HIV-1 strains and that a peptide mimicking the clade B HIV-1 gp120 consensus V3 domain (V3Cs) binds to CCR5. We demonstrate here that AFP binds high- and low-affinity binding sites of MDM, characterized, respectively, by 5.15 and 100nM K(d) values. Heat denaturation or neuraminidase treatment of AFP inhibits this binding, suggesting the involvement of protein-protein and lectin-carbohydrate interactions. Moreover, AFP displaces V3Cs binding to MDM. In addition, MIP-1beta, the most specific CCR5 ligand, displaces AFP binding to MDM (IC(50)=4.3nM). Finally, we demonstrate that AFP binds to a ligand of HIV-gp120 V3Cs domain, CCR5, expressed by MDM and by HeLa cells expressing CCR5. Such binding is not observed in the presence of HeLa cells lacking CCR5. The present results provide strong evidence that AFP directly binds to CCR5 expressed by human primary macrophages and by transfected CCR5+ HeLa cells.
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Affiliation(s)
- Aurélie Atemezem
- UPRES 3410, Biothérapies, Bénéfices et Risques, UFR-SMBH, Université Paris XIII, Bobigny et Hôpital Jean Verdier, Bondy 93017, France
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Mbemba E, Saffar L, Gattegno L. Role of N-glycans and SDF-1alpha on the coassociation of CD4 with CXCR4 at the plasma membrane of monocytic cells and blood lymphocytes. FEBS Lett 2002; 514:209-13. [PMID: 11943153 DOI: 10.1016/s0014-5793(02)02366-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
CXCR4 is a coreceptor, along with CD4, for human immunodeficiency virus type 1 (HIV-1). Trimolecular complexes between HIV-1 glycoprotein (gp)120, CD4 and CXCR4 constitute a prerequisite for HIV entry. We studied whether CD4 is associated with CXCR4 on CD4+ CXCR4+ cells. Using the conformation-dependent anti-CXCR4 mAb 12G5, CD4 was coimmunoprecipitated with CXCR4 from the membrane of U937 cells which support HIV-1(LAI) efficient infection, and from that of peripheral blood lymphocytes (PBL). CD4 association with CXCR4 increased upon PBL coculture for 5 days with autologous monocytes, decreased upon treatment of the cells or the CD4-CXCR4 complex with either N-glycanase or stromal cell derived factor-1alpha (SDF-1alpha) and was abolished by incubation of the cells with both, N-glycanase and SDF-1alpha. This indicates that glycans are partly involved in CD4 association with CXCR4 and may partly explain the inhibitory effect of SDF-1alpha on HIV infection.
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Affiliation(s)
- Elisabeth Mbemba
- Laboratoire de Biologie Cellulaire, EA 3510, Biothérapies, Bénéfices et Risques, Unité de Formation et de Recherche-Santé Médecine et Biologie Humaine, Université Paris XIII, 74 rue Marcel Cachin, 93017 Bobigny, France
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Atemezem A, Mbemba E, Vassy R, Slimani H, Saffar L, Gattegno L. Human alpha1-acid glycoprotein binds to CCR5 expressed on the plasma membrane of human primary macrophages. Biochem J 2001; 356:121-8. [PMID: 11336643 PMCID: PMC1221819 DOI: 10.1042/0264-6021:3560121] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We have reported previously that human alpha(1)-acid glycoprotein (AGP) inhibits the infection of human monocyte-derived macrophages (MDM) by R5 HIV-1, and that a disulphide-bridged peptide mimicking the clade B HIV-1 gp120 consensus V3 domain (V3Cs) binds specifically to CCR5 (the major co-receptor of R5 HIV strains) on these cells [Seddiki, Rabehi, Benjouad, Saffar, Ferriere, Gluckman and Gattegno (1997) Glycobiology 7, 1229-1236]. The present study demonstrates that AGP binds specifically to MDM at high- and low-affinity binding sites with K(d) values of 16 nM and 4.9 microM respectively. The fact that heat denaturation of AGP only partly inhibited this binding (43%) suggests that protein-protein interactions are involved, as well as AGP glycans which are resistant to heat denaturation. Mannan, but not dextran, is a significant inhibitor (52%) of this binding, and sequential exoglycosidase treatment of AGP, which exposes penultimate mannose residues, has a strong stimulatory effect ( approximately 2.8-fold). Therefore AGP glycans (probably mannose residues) are involved, at least partly, in the binding of AGP to MDM. In addition, AGP inhibits the binding of V3Cs and macrophage inflammatory protein-1beta (MIP-1beta) to MDM. The anti-CCR5 monoclonal antibody 2D7, specific for the second extracellular loop of CCR5, also inhibited AGP binding (67%), whereas anti-CCR5 antibodies specific for the C-terminus of CCR5 region had no effect. Native AGP, like V3Cs (but not heat-denatured AGP), binds to 46 and 33-36 kDa electroblotted AGP-bound MDM membrane ligands, characterized as CCR5 by their interactions with anti-CCR5 antibodies and with MIP-1beta. Therefore both AGP glycans and MDM CCR5 are involved in the binding of AGP to MDM. This suggests that the inhibitory effect of AGP on the infection of human primary macrophages by R5 HIV-1 may be related to specific binding of AGP to a macrophage membrane lectin or lectin-like component and to CCR5.
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Affiliation(s)
- A Atemezem
- Laboratoire de Biologie Cellulaire, JE 2138, Faculté de Médecine Léonard de Vinci, Université Paris XIII, Bobigny 93017, France
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Briant L, Devaux C. Bioactive CD4 ligands as pre- and/or postbinding inhibitors of HIV-1. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2001; 48:373-407. [PMID: 10987097 DOI: 10.1016/s1054-3589(00)48012-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- L Briant
- Laboratoire Infections Rétrovirales et Signalisation Cellulaire, CNRS EP 2104, Montpellier, France
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Mbemba E, Slimani H, Atemezem A, Saffar L, Gattegno L. Glycans are involved in RANTES binding to CCR5 positive as well as to CCR5 negative cells. BIOCHIMICA ET BIOPHYSICA ACTA 2001; 1510:354-66. [PMID: 11342172 DOI: 10.1016/s0005-2736(00)00368-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We show that cell surface glycans, sialic acid and mannose-containing species, are involved beside glycosaminoglycans (GAGs), heparan sulfate and chondroitin sulfate in the binding of full length (1--68) RANTES not only to CCR5 positive human primary lymphocytes or macrophages but also to CCR5 negative monocytic U937 cells. Pretreating the cells with neuraminidase, heparitinase, chondroitinase or adding soluble glycans such as mannan or GAGs (heparin or chondroitin sulfate), significantly inhibited RANTES binding. Such effects were not observed with truncated (10--68) RANTES. Heat-denaturation of (1--68) RANTES strongly decreased its binding to the cells, demonstrating involvement of the three-dimensional structure. Accordingly, full length, but not truncated (10--68) RANTES, specifically bound to soluble mannan as well as to mannose-divinylsulfone-agarose affinity matrix and to soluble heparin or chondroitin sulfate as well as to heparin-agarose. Soluble heparin exerts, depending on its concentration, inhibitory or enhancing effects on RANTES binding to mannose-divinylsulfone-agarose, which indicates that RANTES interaction with glycans is modulated by GAGs. These data demonstrate that full length RANTES, but not its (10--68) truncated counterpart, interacts with glycans and GAGs, in soluble forms or presented either by affinity matrices or CCR5 positive as well as CCR5 negative cells.
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Affiliation(s)
- E Mbemba
- Laboratoire de Biologie Cellulaire JE 2138, Faculté de Médecine, Université Paris XIII, 74 rue Marcel Cachin, 93017 Bobigny, France
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Tugarinov V, Zvi A, Levy R, Hayek Y, Matsushita S, Anglister J. NMR structure of an anti-gp120 antibody complex with a V3 peptide reveals a surface important for co-receptor binding. Structure 2000; 8:385-95. [PMID: 10801487 DOI: 10.1016/s0969-2126(00)00119-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND The protein 0.5beta is a potent strain-specific human immunodeficiency virus type 1 (HIV-1) neutralizing antibody raised against the entire envelope glycoprotein (gp120) of the HIV-1(IIIB) strain. The epitope recognized by 0.5beta is located within the third hypervariable region (V3) of gp120. Recently, several HIV-1 V3 residues involved in co-receptor utilization and selection were identified. RESULTS Virtually complete sidechain assignment of the variable fragment (Fv) of 0.5beta in complex with the V3(IIIB) peptide P1053 (RKSIRIQRGPGRAFVTIG, in single-letter amino acid code) was accomplished and the combining site structure of 0.5beta Fv complexed with P1053 was solved using multidimensional nuclear magnetic resonance (NMR). Five of the six complementarity determining regions (CDRs) of the antibody adopt standard canonical conformations, whereas CDR3 of the heavy chain assumes an unexpected fold. The epitope recognized by 0.5beta encompasses 14 of the 18 P1053 residues. The bound peptide assumes a beta-hairpin conformation with a QRGPGR loop located at the very center of the binding pocket. The Fv and peptide surface areas buried upon binding are 601 A and 743 A(2), respectively, in the 0.5beta Fv-P1053 mean structure. The surface of P1053 interacting with the antibody is more extensive and the V3 peptide orientation in the binding site is significantly different compared with those derived from the crystal structures of a V3 peptide of the HIV-1 MN strain (V3(MN)) complexed to three different anti-peptide antibodies. CONCLUSIONS The surface of P1053 that is in contact with the anti-protein antibody 0.5beta is likely to correspond to a solvent-exposed region in the native gp120 molecule. Some residues of this region of gp120 are involved in co-receptor binding, and in discrimination between different chemokine receptors utilized by the protein. Several highly variable residues in the V3 loop limit the specificity of the 0.5beta antibody, helping the virus to escape from the immune system. The highly conserved GPG sequence might have a role in maintaining the beta-hairpin conformation of the V3 loop despite insertions, deletions and mutations in the flanking regions.
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Affiliation(s)
- V Tugarinov
- Department of Structural Biology, The Weizmann Institute of Science, Rehovot, 76100, Israel
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Mbemba E, Benjouad A, Saffar L, Gattegno L. Glycans and proteoglycans are involved in the interactions of human immunodeficiency virus type 1 envelope glycoprotein and of SDF-1alpha with membrane ligands of CD4(+) CXCR4(+) cells. Virology 1999; 265:354-64. [PMID: 10600606 DOI: 10.1006/viro.1999.0033] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We demonstrate that human immunodeficiency virus HIV-1(LAI) envelope glycoprotein 120 (gp120(LAi)) specifically interacts with several membrane ligands on lymphoid CEM or monocytic U937 cells in addition to its previously identified receptor, CD4, and CXCR4, its coreceptor. In its native state, gp120(LAI) is able to elicit specific multimolecular complexes with these membrane ligands at the surface of the cells; most of the interactions are abolished by mannan or heparin but not by dextran. Similarly, stromal cell-derived factor (SDF)-1alpha interacts not only with CXCR4 expressed by CXCR4(+) CD4(+) U937, CEM, and HOS-CD4(+) CXCR4(+) cells but also with CD4 expressed by intact U937, CEM, and HOS-CD4(+) CXCR4(+/-) cells or electroblotted onto Immobilon. SDF-1alpha binding to CD4(+) CXCR4(+/-) cells, or soluble CD4 electroblotted onto Immobilon, is significantly inhibited by sCD4, whereas truncated sCD4 lacking D3 and D4 domains had no significant effect, which indicates that SDF-1 binds to CD4 but at regions different from the HIV-gp120-binding site. Heparin and mannan also inhibit SDF-1alpha binding to intact CD4(+) CXCR4(+/-) cells, and electroblotted soluble CD4. Heparitinase treatment of such cells reduced SDF-1alpha binding. These data demonstrate that glycans and glycosaminoglycans are directly or indirectly involved in the interactions of HIV-1 gp120(LAI) and of SDF-1alpha with membrane ligands of CD4(+) CXCR4(+) cells and thus could play a role both in HIV-1 infection and in the physiology of SDF-1alpha.
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Affiliation(s)
- E Mbemba
- JE 2138, Faculté de Médecine Léonard de Vinci, Bobigny, 93017, France
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