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Abstract
The collagen family of extracellular matrix proteins has played a fundamental role in the evolution of multicellular animals. At the present, 28 triple helical proteins have been named as collagens and they can be divided into several subgroups based on their structural and functional properties. In tissues, the cells are anchored to collagenous structures. Often the interaction is indirect and mediated by matrix glycoproteins, but cells also express receptors, which have the ability to directly bind to the triple helical domains in collagens. Some receptors bind to sites that are abundant in all collagens. However, increasing evidence indicates that the coevolution of collagens and cell adhesion mechanisms has given rise to receptors that bind to specific motifs in collagens. These receptors may also recognize the different members of the large collagen family in a selective manner. This review summarizes the present knowledge about the properties of collagen subtypes as cell adhesion proteins.
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Affiliation(s)
- Jyrki Heino
- Department of Biochemistry and Food Chemistry, University of Turku, Arcanum, Vatselankatu 2, FI-20014 Turku, Finland.
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52
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Bug G, Anargyrou K, Tonn T, Bialleck H, Seifried E, Hoelzer D, Ottmann OG. Impact of leukapheresis on early death rate in adult acute myeloid leukemia presenting with hyperleukocytosis. Transfusion 2007; 47:1843-50. [PMID: 17880610 DOI: 10.1111/j.1537-2995.2007.01406.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND Patients with acute myeloid leukemia (AML) with hyperleukocytosis of at least 100 x 10(9) per L are at high risk of early death due to pulmonary or cerebral leukostasis. Although the efficacy of leukapheresis in terms of prompt cytoreduction is generally accepted, published data regarding the clinical value of immediate therapeutic leukapheresis are limited and conflicting. STUDY DESIGN AND METHODS To determine whether leukapheresis has a favorable impact on early mortality, the clinical course of 53 newly diagnosed patients with AML and hyperleukocytosis admitted between 1995 and 2005 was analyzed retrospectively. Before August 2001, 28 patients received chemotherapy without leukoreduction (Cohort A). Thereafter, all AML patients with hyperleukocytosis were scheduled to receive leukapheresis, which was performed in 25 patients (Cohort B). RESULTS There were no procedure-related adverse events. By Day 21 of therapy, 13 of 53 patients had died, resulting in an overall early death rate of 25 percent. In a multivariate logistic regression model, patients in Cohort B had a significantly lower risk of early death than patients in Cohort A (16% vs. 32%, respectively; p = 0.015). Dyspnea (p = 0.005), elevated creatinine (p = 0.028), and higher lactate dehydrogenase serum levels (p = 0.021) were independent risk factors for early death. With a median follow-up of 24.2 months, the overall survival was similar in both cohorts (Cohort A, 7.5; Cohort B, 6.5 months). Thus, leukapheresis had no impact on patients' long-term survivals. CONCLUSIONS Our experience suggests that AML patients with hyperleukocytosis receiving leukapheresis had a significantly lower risk for early death by Day 21 than patients treated without leukapheresis. We therefore have adopted leukapheresis as a standard procedure in our department.
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Affiliation(s)
- Gesine Bug
- Department of Internal Medicine II, University Hospital, Johann Wolfgang Goethe-University, Theodor Stern-Kai 7, D-60590 Frankfurt am Main, Germany.
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53
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Abstract
The integrins are a superfamily of cell adhesion receptors that bind to extracellular matrix ligands, cell-surface ligands, and soluble ligands. They are transmembrane alphabeta heterodimers and at least 18 alpha and eight beta subunits are known in humans, generating 24 heterodimers. Members of this family have been found in mammals, chicken and zebrafish, as well as lower eukaryotes, including sponges, the nematode Caenorhabditis elegans (two alpha and one beta subunits, generating two integrins) and the fruitfly Drosophila melanogaster (five alpha and one beta, generating five integrins). The alpha and beta subunits have distinct domain structures, with extracellular domains from each subunit contributing to the ligand-binding site of the heterodimer. The sequence arginine-glycine-aspartic acid (RGD) was identified as a general integrin-binding motif, but individual integrins are also specific for particular protein ligands. Immunologically important integrin ligands are the intercellular adhesion molecules (ICAMs), immunoglobulin superfamily members present on inflamed endothelium and antigen-presenting cells. On ligand binding, integrins transduce signals into the cell interior; they can also receive intracellular signals that regulate their ligand-binding affinity. Here we provide a brief overview that concentrates mostly on the organization, structure and function of mammalian integrins, which have been more extensively studied than integrins in other organisms.
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Affiliation(s)
- Yoshikazu Takada
- Department of Dermatology, University of California Davis School of Medicine, Second Avenue, Sacramento, CA 95817, USA.
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54
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Sadhu C, Ting HJ, Lipsky B, Hensley K, Garcia-Martinez LF, Simon SI, Staunton DE. CD11c/CD18: novel ligands and a role in delayed-type hypersensitivity. J Leukoc Biol 2007; 81:1395-403. [PMID: 17389580 DOI: 10.1189/jlb.1106680] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
CD11c, a member of the leukointegrin family, is expressed prominently on tissue macrophages and dendritic cells and binds to complement fragment (iC3b), provisional matrix molecules (fibrinogen), and the Ig superfamily cell adhesion molecule, ICAM-1. CD11c has been proposed to function in phagocytosis, cell migration, and cytokine production by monocytes/macrophages as well as induction of T cell proliferation by Langerhans cells. Using assays to quantify CD11c-mediated cell adhesion, we demonstrate that CD11c recognizes ICAM-2 and VCAM-1. The CD11c-binding site on VCAM-1 appears to be different from that used by the integrin alpha4. CD11c and alpha4beta1 contributed to monocyte capture and transmigration on inflamed human aortic endothelial cells. We discovered that the anti-mouse CD11c mAb N418 blocks CD11c binding to iC3b, ICAM-1, and VCAM-1. Treatment of mice with N418 reduced SRBC-induced delayed-type hypersensitivity significantly. CD11c appeared to contribute predominantly to the sensitization phase and somewhat less to the response to SRBC challenge. This suggests a novel role for CD11c during leukocyte recruitment, antigen uptake, and the survival of APC.
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Affiliation(s)
- Chanchal Sadhu
- ICOS Corporation, 22021 20th Ave., S.E., Bothell, WA 98021, USA.
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55
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Jaisson S, Lorimier S, Ricard-Blum S, Sockalingum GD, Delevallée-Forte C, Kegelaer G, Manfait M, Garnotel R, Gillery P. Impact of Carbamylation on Type I Collagen Conformational Structure and Its Ability to Activate Human Polymorphonuclear Neutrophils. ACTA ACUST UNITED AC 2006; 13:149-59. [PMID: 16492563 DOI: 10.1016/j.chembiol.2005.11.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2005] [Revised: 10/31/2005] [Accepted: 11/08/2005] [Indexed: 10/25/2022]
Abstract
Carbamylation by urea-derived cyanate is a posttranslational modification of proteins increasing during chronic renal insufficiency, which alters structural and functional properties of proteins and modifies their interactions with cells. We report here the major structural alterations of type I collagen induced by carbamylation. Biophysical methods revealed that carbamylated collagen retained its triple-helical structure, but that slight changes destabilized some regions within the triple helix and decreased its ability to polymerize into normal fibrils. These changes were associated with the incapacity of carbamylated collagen to stimulate polymorphonuclear neutrophil oxidative functions. This process involved their interaction with LFA-1 integrin, but no subsequent p(125)FAK phosphorylation. Carbamylation of collagen might alter interactions between collagen and inflammatory cells in vivo and interfere with the normal remodeling of extracellular matrix, thus participating in the pathophysiological processes occurring during renal insufficiency.
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Affiliation(s)
- Stéphane Jaisson
- Laboratory of Medical Biochemistry and Molecular Biology, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 6198, Faculty of Medicine, University of Reims Champagne-Ardenne, France
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56
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Prasse A, Pechkovsky DV, Toews GB, Jungraithmayr W, Kollert F, Goldmann T, Vollmer E, Müller-Quernheim J, Zissel G. A vicious circle of alveolar macrophages and fibroblasts perpetuates pulmonary fibrosis via CCL18. Am J Respir Crit Care Med 2006; 173:781-92. [PMID: 16415274 DOI: 10.1164/rccm.200509-1518oc] [Citation(s) in RCA: 342] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
RATIONALE Recently, models of macrophage activation have been revised. Macrophages stimulated with Th2 cytokines have been classified as alternatively activated. OBJECTIVES This article examines the expression and regulation of CC chemokine ligand 18 (CCL18), a marker of alternative activation, by human alveolar macrophages (AMs). METHODS AM were obtained from bronchoalveolar lavage (BAL) fluid of patients with idiopathic pulmonary fibrosis, sarcoidosis, or hypersensitivity pneumonitis (n = 69) and healthy volunteers (n = 22). Expression of CCL18 was determined by quantitative reverse transcriptase-polymerase chain reaction, in situ hybridization, flow cytometry, and immunohistochemistry, respectively. MEASUREMENTS AND MAIN RESULTS Spontaneous CCL18 production by BAL-derived cells was markedly increased in patients with pulmonary fibrosis and correlated negatively with pulmonary function test parameters. CCL18 gene expression and protein production were up-regulated in normal AMs after Th2 cytokine stimulation and/or coculture with human lung fibroblasts. Native collagen significantly up-regulated CCL18 expression in normal AMs activated with Th2 cytokines via a mechanism mediated by beta2-integrin/ scavenger receptor(s). Culture supernatants of AMs from patients with idiopathic pulmonary fibrosis increased collagen production by normal lung fibroblasts partly mediated via CCL18. CONCLUSIONS Our findings suggest that AMs from patients with pulmonary fibrosis disclose a phenotype of alternative activation and might be a part of a positive feedback loop with lung fibroblasts perpetuating fibrotic processes.
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Affiliation(s)
- Antje Prasse
- Department of Pneumology, University Hospital, Killianstr. 5, 79106 Freiburg, Germany.
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57
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Ruiz-Torres MP, Pérez-Rivero G, Rodríguez-Puyol M, Rodríguez-Puyol D, Díez-Marqués ML. The Leukocyte-Endothelial Cell Interactions are Modulated by Extracellular Matrix Proteins. Cell Physiol Biochem 2006; 17:221-32. [PMID: 16790998 DOI: 10.1159/000094127] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Endothelium is supported, in normal conditions, by a basement membrane composed, among others, by collagen IV and laminin. Changes in the basement membrane composition could induce changes in endothelial cell modifying their interactions with leukocytes. METHODS AND RESULTS Isolated polymorphonuclear cells (PMN) and peripheral blood mononuclear cells (PBMC) were added to cultured human umbilical endothelial cells (HuVEC) previously seeded on collagen IV, collagen I or gelatin. Adhesion of leukocytes to HUVEC and specific cytotoxicity were analysed. PMN adhesion and cytotoxicity were lower whereas those from PBMC were higher when HuVEC were seeded on collagen I, as compared with cells seeded on collagen IV. To analyse the mechanisms involved in these phenomena, P-selectin, ICAM-1, VCAM-1 and MCP- 1 expression were evaluated in HuVEC seeded on the different ECM components. P-selectin and mRNA expression of VCAM-1 were lower in cells seeded on collagen I. By contrast, MCP-1 expression was higher in collagen I. Collagen I-dependent effects were partially prevented when collagen I was treated with pepsin. ILK activity was lower in cells seeded on collagen I, whereas ERK 1/2 activity was enhanced. ILK overexpression reduced ERK 1/2 phosphorylation and this could promote the reduction in P-selectin and the increase in MCP-1. CONCLUSION Collagen I decreased ILK activity and this would induce an increase in ERK 1/2 activity in HuVEC. As a consequence, the P-selectin content is diminished and, by contrast, the MCP-1 content is increased. The final effect is a lower recruitment of PMN and a higher adhesion of PBMC.
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58
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Nguyen TD, Maquart FX, Monboisse JC. Ionizing radiations and collagen metabolism: from oxygen free radicals to radio-induced late fibrosis. Radiat Phys Chem Oxf Engl 1993 2005. [DOI: 10.1016/j.radphyschem.2004.01.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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59
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Ortega-Velazquez R, Gonzalez-Rubio M, Ruiz-Torres MP, Diez-Marques ML, Iglesias MC, Rodríguez-Puyol M, Rodríguez-Puyol D. Collagen I upregulates extracellular matrix gene expression and secretion of TGF-β1 by cultured human mesangial cells. Am J Physiol Cell Physiol 2004; 286:C1335-43. [PMID: 14761892 DOI: 10.1152/ajpcell.00279.2003] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Progressive renal diseases are characterized by an increased synthesis of extracellular matrix (ECM) components. The mechanisms involved in the development of these alterations are not completely known, but a crucial role for TGF-β1 has been suggested. Moreover, the ability of the ECM to modulate the phenotypic expression of different cell types has been widely described. In experiments presented here, human mesangial cells (HMC) were grown on collagen type I (COL I) or IV (COL IV). ECM protein and TGF-β1 mRNA expression were evaluated by Northern blot analysis, and TGF-β1 secretion was evaluated by ELISA. The involvement of tyrosine kinase and serine-threonine kinase pathways was studied by Western blot analysis, immunofluorescence, and in vitro kinase assays. HMC cultured on COL I showed an increased mRNA expression of COL I and COL IV, fibronectin, and TGF-β1. Both tyrosine phosphorylation and integrin-linked kinase (ILK) activity increased when HMC were cultured on COL I, and blockade of these pathways inhibited the increased secretion of TGF-β1. In conclusion, the present results support a role for extracellular COL I in the regulation of TGF-β1 synthesis during progressive renal sclerosis and fibrosis and the subsequent increase in newly synthesized ECM proteins. In addition, ILK, along with the tyrosine kinases, participates in the genesis of this effect.
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Affiliation(s)
- R Ortega-Velazquez
- Department of Physiology, Alcala University, Alcalá de Henares, Madrid, Spain.
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60
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Garnotel R, Sabbah N, Jaisson S, Gillery P. Enhanced activation of and increased production of matrix metalloproteinase-9 by human blood monocytes upon adhering to carbamylated collagen. FEBS Lett 2004; 563:13-6. [PMID: 15063715 DOI: 10.1016/s0014-5793(04)00233-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2003] [Revised: 02/13/2004] [Accepted: 02/17/2004] [Indexed: 10/26/2022]
Abstract
Carbamylation refers to chemical modification of protein side chains by cyanate derived e.g. from urea. It alters their structural and functional properties. We have studied the influence of the carbamylation of type I collagen in vitro on its interactions with elutriated human monocytes, and its potential role in atherosclerosis. Adhesion of monocytes onto carbamylated collagen was significantly enhanced compared to native collagen. There was no change in superoxide anion production. On the other hand, there was an increase in the production and the activation of matrix metalloproteinase-9. No effect was found on tissue inhibitor of metalloproteinase-1 production. Thus, the presence of carbamylated collagen may stimulate the remodelling of extracellular matrix mediated by activated monocytes. Such alterations may contribute to enhanced atherosclerosis in renal insufficiency, a pathological condition associated with elevated levels of carbamylation.
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Affiliation(s)
- Roselyne Garnotel
- Laboratory of Biochemistry and Molecular Biology, CNRS UMR 6198, IFR 53-Biomolecules, Faculty of Medicine, University of Reims Champagne-Ardenne, 51 Rue Cognacq Jay, 51095 Reims Cedex, France
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61
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Li Q, Fukuda K, Lu Y, Nakamura Y, Chikama TI, Kumagai N, Nishida T. Enhancement by neutrophils of collagen degradation by corneal fibroblasts. J Leukoc Biol 2003; 74:412-9. [PMID: 12949245 DOI: 10.1189/jlb.0801757] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Activated corneal fibroblasts and infiltrated leukocytes are thought to contribute to corneal ulceration. The potential roles of neutrophil-fibroblast and cell-matrix interactions in the degradation of stromal collagen associated with corneal ulceration have now been investigated with the use of three-dimensional cultures of rabbit cells in collagen gels. Degradation of collagen fibrils during culture was measured by spectrophotometric determination of released hydroxyproline. Whereas corneal fibroblasts alone degraded collagen fibrils to a small extent, neutrophils did not. However, the addition of neutrophils or neutrophil-conditioned medium (CM) to cultures of corneal fibroblasts resulted in a marked increase in the amount of collagen degraded by the fibroblasts. The effect of CM from neutrophils cultured in collagen gels on collagen degradation by corneal fibroblasts was greater than that of medium conditioned by neutrophils in monolayer culture. Immunoblot as well as reverse transcription and real-time polymerase chain reaction analyses revealed that neutrophil-CM stimulated the synthesis of matrix metalloproteinase (MMP)-1 and MMP-3 by corneal fibroblasts. The stimulatory effect of neutrophils on collagen degradation by corneal fibroblasts was inhibited by the synthetic MMP inhibitor ilomastat and by interleukin-1 (IL-1) receptor antagonist. These results suggest that factors secreted by collagen-stimulated neutrophils augment collagen degradation by corneal fibroblasts through a stimulatory effect on MMP synthesis and that IL-1 released by neutrophils may contribute to this effect.
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Affiliation(s)
- Qin Li
- Department of Biomolecular Recognition and Ophthalmology, Yamaguchi University School of Medicine, Ube City, Japan
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62
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de Fougerolles AR, Koteliansky VE. Regulation of monocyte gene expression by the extracellular matrix and its functional implications. Immunol Rev 2002; 186:208-20. [PMID: 12234373 DOI: 10.1034/j.1600-065x.2002.18617.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
By binding to extracellular matrix (ECM) proteins, integrins integrate signals from outside the cell and transmit them inwards, thereby providing cells with information about location and allowing them to respond to stimuli in a manner appropriate to their environment. This is particularly important for monocytes and macrophages, given their wide distribution throughout the body and the vital role they play in immune and inflammatory responses. Integrin-mediated interaction of monocytes with ECM is a potent regulator of gene expression and is strongly synergized by the presence of growth factors. This synergy between growth factors and integrins is also apparent in the overlap seen in their signaling pathways. Integrin-mediated interaction with ECM results in increased expression of numerous inflammatory and immune response genes, revealing an important role for ECM-integrin interaction in affecting monocyte function and thus impacting on the development of pathologies. This is of particular relevance in the context of immune and inflammatory responses, where integrin-mediated adhesive interactions with the ECM-rich peripheral tissues are central to the localization of both resident and infiltrating monocytes at inflammatory sites. Here, we will review the functional effects of integrin-ECM interactions on monocytes, with particular attention to the regulation of gene expression by ECM and its functional implications.
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63
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Bouvard D, Brakebusch C, Gustafsson E, Aszódi A, Bengtsson T, Berna A, Fässler R. Functional consequences of integrin gene mutations in mice. Circ Res 2001; 89:211-23. [PMID: 11485971 DOI: 10.1161/hh1501.094874] [Citation(s) in RCA: 149] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Integrins are cell-surface receptors responsible for cell attachment to extracellular matrices and to other cells. The application of mouse genetics has significantly increased our understanding of integrin function in vivo. In this review, we summarize the phenotypes of mice carrying mutant integrin genes and compare them with phenotypes of mice lacking the integrin ligands.
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Affiliation(s)
- D Bouvard
- Department of Experimental Pathology, Lund University, Lund, Sweden.
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64
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Rezzonico R, Imbert V, Chicheportiche R, Dayer JM. Ligation of CD11b and CD11c beta(2) integrins by antibodies or soluble CD23 induces macrophage inflammatory protein 1alpha (MIP-1alpha) and MIP-1beta production in primary human monocytes through a pathway dependent on nuclear factor-kappaB. Blood 2001; 97:2932-40. [PMID: 11342414 DOI: 10.1182/blood.v97.10.2932] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Chemokines and adhesion molecules such as integrins play a major part in the trafficking, extravasation, and recruitment of leukocytes to inflammatory sites. This study investigated the effects of beta(2) integrin engagement on chemokine production by freshly isolated human monocytes. We found that ligation of CD11b or CD11c but not CD11a alpha chains of beta(2) integrins by antibodies or soluble CD23 (sCD23) fusion proteins rapidly induced transcription and secretion of interleukin 8, macrophage inflammatory protein (MIP) 1alpha, and MIP-1beta. Because the promoters of these chemokine genes contain kappaB binding sites, we assessed the possible role of nuclear factor-kappaB (NF-kappaB) in controlling induction of the genes through beta(2) integrin engagement. Electrophoretic mobility shift assays showed that sCD23 or antibodies to CD11b or to CD11c up-regulated DNA-binding activity of NF-kappaB. Activation of NF-kappaB was accompanied by degradation of its cytosolic inhibitor IkappaB-alpha. Blockade of depletion of IkappaB-alpha by proteasome inhibitors (proteasome inhibitor I or acetyl-leucinyl-leucinyl-norleucinal) led to concomitant inhibition of NF-kappaB DNA-binding activity and expression of MIP-1alpha and MIP-1beta messenger RNA induced by beta(2) integrin ligation. These results suggest that triggering of CD11b or CD11c beta(2) integrin on primary human monocytes provides activation signals leading to nuclear translocation of NF-kappaB and subsequent secretion of MIP-1alpha and MIP-1beta that may have an important role in recruitment of other inflammatory cells during initiation of an inflammatory response.
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Affiliation(s)
- R Rezzonico
- Division of Immunology and Allergy, Clinical Immunology Unit (Hans Wilsdorf Laboratory), Department of Internal Medicine, University Hospital, Geneva, Switzerland.
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Giblin PA, Kelly TA. Chapter 18 . Antagonists of 02 integrin-mediated cell adhesion. ANNUAL REPORTS IN MEDICINAL CHEMISTRY 2001. [DOI: 10.1016/s0065-7743(01)36058-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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