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Bongrand P. Is There a Need for a More Precise Description of Biomolecule Interactions to Understand Cell Function? Curr Issues Mol Biol 2022; 44:505-525. [PMID: 35723321 PMCID: PMC8929073 DOI: 10.3390/cimb44020035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 01/15/2022] [Accepted: 01/17/2022] [Indexed: 11/16/2022] Open
Abstract
An important goal of biological research is to explain and hopefully predict cell behavior from the molecular properties of cellular components. Accordingly, much work was done to build extensive “omic” datasets and develop theoretical methods, including computer simulation and network analysis to process as quantitatively as possible the parameters contained in these resources. Furthermore, substantial effort was made to standardize data presentation and make experimental results accessible to data scientists. However, the power and complexity of current experimental and theoretical tools make it more and more difficult to assess the capacity of gathered parameters to support optimal progress in our understanding of cell function. The purpose of this review is to focus on biomolecule interactions, the interactome, as a specific and important example, and examine the limitations of the explanatory and predictive power of parameters that are considered as suitable descriptors of molecular interactions. Recent experimental studies on important cell functions, such as adhesion and processing of environmental cues for decision-making, support the suggestion that it should be rewarding to complement standard binding properties such as affinity and kinetic constants, or even force dependence, with less frequently used parameters such as conformational flexibility or size of binding molecules.
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Affiliation(s)
- Pierre Bongrand
- Lab Adhesion and Inflammation (LAI), Inserm UMR 1067, Cnrs UMR 7333, Aix-Marseille Université UM 61, Marseille 13009, France
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Abstract
How do cells process environmental cues to make decisions? This simple question is still generating much experimental and theoretical work, at the border of physics, chemistry and biology, with strong implications in medicine. The purpose of mechanobiology is to understand how biochemical and physical cues are turned into signals through mechanotransduction. Here, we review recent evidence showing that (i) mechanotransduction plays a major role in triggering signalling cascades following cell-neighbourhood interaction; (ii) the cell capacity to continually generate forces, and biomolecule properties to undergo conformational changes in response to piconewton forces, provide a molecular basis for understanding mechanotransduction; and (iii) mechanotransduction shapes the guidance cues retrieved by living cells and the information flow they generate. This includes the temporal and spatial properties of intracellular signalling cascades. In conclusion, it is suggested that the described concepts may provide guidelines to define experimentally accessible parameters to describe cell structure and dynamics, as a prerequisite to take advantage of recent progress in high-throughput data gathering, computer simulation and artificial intelligence, in order to build a workable, hopefully predictive, account of cell signalling networks.
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Affiliation(s)
- Pierre-Henri Puech
- Lab Adhesion and Inflammation (LAI), Inserm UMR 1067, CNRS UMR 7333, Aix-Marseille Université UM61, Marseille, France
| | - Pierre Bongrand
- Lab Adhesion and Inflammation (LAI), Inserm UMR 1067, CNRS UMR 7333, Aix-Marseille Université UM61, Marseille, France
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Bertin D, Mouhajir Y, Bongrand P, Bardin N. ICARE improves antinuclear antibody detection by overcoming the barriers preventing accreditation. Clin Chim Acta 2016; 454:57-61. [PMID: 26742604 DOI: 10.1016/j.cca.2015.12.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 12/28/2015] [Accepted: 12/28/2015] [Indexed: 11/17/2022]
Abstract
BACKGROUND Antinuclear antibodies (ANA) are useful biomarkers for the diagnosis and the monitoring of rheumatic diseases. The American College of Rheumatology has stated that indirect immunofluorescence (IIF) analysis remains the gold standard for ANA screening. However, IIF is time consuming, subjective, not fully standardized and presents several issues for accreditation which is the process leading to ISO 15189 certification for medical laboratories. We propose an innovative tool for accreditation by using the quantitative evaluation of the automated image capture and analysis "ICARE" (Immunofluorescence for Computed Antinuclear antibody Rational Evaluation). METHODS We established the optimal screening dilution (1:160) and a fluorescence index (FI) cutoff for ICARE on a cohort of 91 healthy blood donors. Then, we evaluated performance of ICARE on a routine cohort of 236 patients. Precision parameters of ANA detection by IIF were evaluated according to ISO 15189. RESULTS ICARE showed an excellent concordance with visual evaluation (88%, Kappa=0.76) and significantly discriminated between weak to moderate (1:160-1:320 titers) and high (>1:320 titers) ANA levels. A significant correlation was found between FI and ANA titers (Spearman's ρ=0.67; P<0.0001). Using ICARE, we reported precision parameters such as repeatability (CV<13.8%) and reproducibility (CV<13.1%) as well as absence of inter-sample contamination for ANA detection by IIF according to ISO 15189 standards. CONCLUSIONS ICARE offers a precious help for the accreditation of IIF qualitative methods. This innovative quantitative approach is in adequacy with the process of continuous improvement of the quality of clinical laboratories.
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Affiliation(s)
- Daniel Bertin
- Laboratoire d'Immunologie, Hôpital de la Conception, Assistance Publique-Hôpitaux de Marseille, France.
| | - Yassin Mouhajir
- Laboratoire d'Immunologie, Hôpital de la Conception, Assistance Publique-Hôpitaux de Marseille, France
| | - Pierre Bongrand
- Laboratoire d'Immunologie, Hôpital de la Conception, Assistance Publique-Hôpitaux de Marseille, France; Aix-Marseille Université, Laboratoire Adhésion et Inflammation, Marseille, France; INSERM, U1067, France; CNRS, U7333, France
| | - Nathalie Bardin
- Laboratoire d'Immunologie, Hôpital de la Conception, Assistance Publique-Hôpitaux de Marseille, France; INSERM, U1076, France; Aix-Marseille Université, Laboratoire Endothélium, Pathologies Vasculaires et Cibles Thérapeutiques, Marseille, France
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Preira P, Forel JM, Robert P, Nègre P, Biarnes-Pelicot M, Xeridat F, Bongrand P, Papazian L, Theodoly O. The leukocyte-stiffening property of plasma in early acute respiratory distress syndrome (ARDS) revealed by a microfluidic single-cell study: the role of cytokines and protection with antibodies. Crit Care 2016; 20:8. [PMID: 26757701 PMCID: PMC4711060 DOI: 10.1186/s13054-015-1157-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 12/06/2015] [Indexed: 12/19/2022]
Abstract
Background Leukocyte-mediated pulmonary inflammation is a key pathophysiological mechanism involved in acute respiratory distress syndrome (ARDS). Massive sequestration of leukocytes in the pulmonary microvasculature is a major triggering event of the syndrome. We therefore investigated the potential role of leukocyte stiffness and adhesiveness in the sequestration of leukocytes in microvessels. Methods This study was based on in vitro microfluidic assays using patient sera. Cell stiffness was assessed by measuring the entry time (ET) of a single cell into a microchannel with a 6 × 9–μm cross-section under a constant pressure drop (ΔP = 160 Pa). Primary neutrophils and monocytes, as well as the monocytic THP-1 cell line, were used. Cellular adhesiveness to human umbilical vein endothelial cells was examined using the laminar flow chamber method. We compared the properties of cells incubated with the sera of healthy volunteers (n = 5), patients presenting with acute cardiogenic pulmonary edema (ACPE; n = 6), and patients with ARDS (n = 22), of whom 13 were classified as having moderate to severe disease and the remaining 9 as having mild disease. Results Rapid and strong stiffening of primary neutrophils and monocytes was induced within 30 minutes (mean ET >50 seconds) by sera from the ARDS group compared with both the healthy subjects and the ACPE groups (mean ET <1 second) (p < 0.05). Systematic measurements with the THP-1 cell line allowed for the establishment of a strong correlation between stiffening and the severity of respiratory status (mean ET 0.82 ± 0.08 seconds for healthy subjects, 1.6 ± 1.0 seconds for ACPE groups, 10.5 ± 6.1 seconds for mild ARDS, and 20.0 ± 8.1 seconds for moderate to severe ARDS; p < 0.05). Stiffening correlated with the cytokines interleukin IL-1β, IL-8, tumor necrosis factor TNF-α, and IL-10 but not with interferon-γ, transforming growth factor-β, IL-6, or IL-17. Strong stiffening was induced by IL-1β, IL-8, and TNF-α but not by IL-10, and incubations with sera and blocking antibodies against IL-1β, IL-8, or TNF-α significantly diminished the stiffening effect of serum. In contrast, the measurements of integrin expression (CD11b, CD11a, CD18, CD49d) and leukocyte–endothelium adhesion showed a weak and slow response after incubation with the sera of patients with ARDS (several hours), suggesting a lesser role of leukocyte adhesiveness compared with leukocyte stiffness in early ARDS. Conclusions The leukocyte stiffening induced by cytokines in the sera of patients might play a role in the sequestration of leukocytes in the lung capillary beds during early ARDS. The inhibition of leukocyte stiffening with blocking antibodies might inspire future therapeutic strategies. Electronic supplementary material The online version of this article (doi:10.1186/s13054-015-1157-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Pascal Preira
- Adhésion et Inflammation, Université Aix-Marseille, INSERM U1067, CNRS UMR7333, 163 avenue de Luminy, Marseille, 13009, France. .,Laboratoire d'Immunologie, Assistance Publique - Hôpitaux de Marseille, 147, boulevard Baille, F-13285 Cedx 05, Marseille, France.
| | - Jean-Marie Forel
- Assistance Publique - Hôpitaux de Marseille, Hôpital Nord, Réanimation des Détresses Respiratoires et des Infections Sévères, 13015, Marseille, France. .,Aix-Marseille Université, Faculté de médecine, URMITE UMR CNRS 7278, 13005, Marseille, France.
| | - Philippe Robert
- Adhésion et Inflammation, Université Aix-Marseille, INSERM U1067, CNRS UMR7333, 163 avenue de Luminy, Marseille, 13009, France. .,Laboratoire d'Immunologie, Assistance Publique - Hôpitaux de Marseille, 147, boulevard Baille, F-13285 Cedx 05, Marseille, France.
| | - Paulin Nègre
- Adhésion et Inflammation, Université Aix-Marseille, INSERM U1067, CNRS UMR7333, 163 avenue de Luminy, Marseille, 13009, France.,Laboratoire d'Immunologie, Assistance Publique - Hôpitaux de Marseille, 147, boulevard Baille, F-13285 Cedx 05, Marseille, France
| | - Martine Biarnes-Pelicot
- Adhésion et Inflammation, Université Aix-Marseille, INSERM U1067, CNRS UMR7333, 163 avenue de Luminy, Marseille, 13009, France.,Laboratoire d'Immunologie, Assistance Publique - Hôpitaux de Marseille, 147, boulevard Baille, F-13285 Cedx 05, Marseille, France
| | - Francois Xeridat
- Assistance Publique - Hôpitaux de Marseille, Hôpital Nord, Réanimation des Détresses Respiratoires et des Infections Sévères, 13015, Marseille, France. .,Aix-Marseille Université, Faculté de médecine, URMITE UMR CNRS 7278, 13005, Marseille, France.
| | - Pierre Bongrand
- Adhésion et Inflammation, Université Aix-Marseille, INSERM U1067, CNRS UMR7333, 163 avenue de Luminy, Marseille, 13009, France. .,Laboratoire d'Immunologie, Assistance Publique - Hôpitaux de Marseille, 147, boulevard Baille, F-13285 Cedx 05, Marseille, France.
| | - Laurent Papazian
- Assistance Publique - Hôpitaux de Marseille, Hôpital Nord, Réanimation des Détresses Respiratoires et des Infections Sévères, 13015, Marseille, France. .,Aix-Marseille Université, Faculté de médecine, URMITE UMR CNRS 7278, 13005, Marseille, France.
| | - Olivier Theodoly
- Adhésion et Inflammation, Université Aix-Marseille, INSERM U1067, CNRS UMR7333, 163 avenue de Luminy, Marseille, 13009, France. .,Laboratoire d'Immunologie, Assistance Publique - Hôpitaux de Marseille, 147, boulevard Baille, F-13285 Cedx 05, Marseille, France.
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Abstract
T cells carry out the formidable task of identifying small numbers of foreign antigenic peptides rapidly and specifically against a very noisy environmental background of endogenous self-peptides. Early steps in T cell activation have thus fascinated biologists and are among the best-studied models of cell stimulation. This remarkable process, critical in adaptive immune responses, approaches and even seems to exceed the limitations set by the physical laws ruling molecular behavior. Despite the enormous amount of information concerning the nature of molecules involved in the T cell antigen receptor (TCR) signal transduction network, and the description of the nanoscale organization and real-time analysis of T cell responses, the general principles of information gathering and processing remain incompletely understood. Here we review currently accepted key data on TCR function, discuss the limitations of current research strategies, and suggest a novel model of TCR triggering and a few promising ways of going further into the integration of available data.
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Affiliation(s)
- Bernard Malissen
- Centre d'Immunologie de Marseille-Luminy and Centre d'Immunophénomique, Aix-Marseille Université, INSERM U1104 and US012, CNRS UMR7280 and UMS3367, 13288 Marseille Cedex 09, France;
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Cazaux S, Sadoun A, Biarnes-Pelicot M, Martinez M, Obeid S, Bongrand P, Limozin L, Puech PH. Synchronizing atomic force microscopy force mode and fluorescence microscopy in real time for immune cell stimulation and activation studies. Ultramicroscopy 2015; 160:168-181. [PMID: 26521163 DOI: 10.1016/j.ultramic.2015.10.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 09/17/2015] [Accepted: 10/12/2015] [Indexed: 11/24/2022]
Abstract
A method is presented for combining atomic force microscopy (AFM) force mode and fluorescence microscopy in order to (a) mechanically stimulate immune cells while recording the subsequent activation under the form of calcium pulses, and (b) observe the mechanical response of a cell upon photoactivation of a small G protein, namely Rac. Using commercial set-ups and a robust signal coupling the fluorescence excitation light and the cantilever bending, the applied force and activation signals were very easily synchronized. This approach allows to control the entire mechanical history of a single cell up to its activation and response down to a few hundreds of milliseconds, and can be extended with very minimal adaptations to other cellular systems where mechanotransduction is studied, using either purely mechanical stimuli or via a surface bound specific ligand.
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Affiliation(s)
- Séverine Cazaux
- Aix Marseille Université, LAI UM 61, Marseille F-13288, France; Inserm, UMR_S 1067, Marseille F-13288, France; CNRS, UMR 7333, Marseille F-13288, France
| | - Anaïs Sadoun
- Aix Marseille Université, LAI UM 61, Marseille F-13288, France; Inserm, UMR_S 1067, Marseille F-13288, France; CNRS, UMR 7333, Marseille F-13288, France
| | - Martine Biarnes-Pelicot
- Aix Marseille Université, LAI UM 61, Marseille F-13288, France; Inserm, UMR_S 1067, Marseille F-13288, France; CNRS, UMR 7333, Marseille F-13288, France
| | - Manuel Martinez
- Aix Marseille Université, LAI UM 61, Marseille F-13288, France; Inserm, UMR_S 1067, Marseille F-13288, France; CNRS, UMR 7333, Marseille F-13288, France
| | - Sameh Obeid
- Aix Marseille Université, LAI UM 61, Marseille F-13288, France; Inserm, UMR_S 1067, Marseille F-13288, France; CNRS, UMR 7333, Marseille F-13288, France
| | - Pierre Bongrand
- Aix Marseille Université, LAI UM 61, Marseille F-13288, France; Inserm, UMR_S 1067, Marseille F-13288, France; CNRS, UMR 7333, Marseille F-13288, France; APHM, Hôpital de la Conception, Laboratoire d'Immunologie, Marseille F-13385, France
| | - Laurent Limozin
- Aix Marseille Université, LAI UM 61, Marseille F-13288, France; Inserm, UMR_S 1067, Marseille F-13288, France; CNRS, UMR 7333, Marseille F-13288, France
| | - Pierre-Henri Puech
- Aix Marseille Université, LAI UM 61, Marseille F-13288, France; Inserm, UMR_S 1067, Marseille F-13288, France; CNRS, UMR 7333, Marseille F-13288, France.
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Brodovitch A, Shenderov E, Cerundolo V, Bongrand P, Pierres A, van der Merwe PA. T lymphocytes need less than 3 min to discriminate between peptide MHCs with similar TCR-binding parameters. Eur J Immunol 2015; 45:1635-42. [PMID: 25782169 PMCID: PMC4657482 DOI: 10.1002/eji.201445214] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 02/17/2015] [Accepted: 03/13/2015] [Indexed: 11/10/2022]
Abstract
T lymphocytes need to detect rare cognate foreign peptides among numerous foreign and self-peptides. This discrimination seems to be based on the kinetics of TCRs binding to their peptide-MHC (pMHC) ligands, but there is little direct information on the minimum time required for processing elementary signaling events and deciding to initiate activation. Here, we used interference reflection microscopy to study the early interaction between transfected human Jurkat T cells expressing the 1G4 TCR and surfaces coated with five different pMHC ligands of 1G4. The pMHC concentration required for inducing 50% maximal IFN-γ production by T cells, and 1G4-pMHC dissociation rates measured in soluble phase or on surface-bound molecules, displayed six- to sevenfold variation among pMHCs. When T cells were dropped onto pMHC-coated surfaces, rapid spreading occurred after a 2-min lag. The initial spreading rate measured during the first 45 s, and the contact area, were strongly dependent on the encountered TCR ligand. However, the lag duration did not significantly depend on encountered ligand. In addition, spreading appeared to be an all-or-none process, and the fraction of spreading cells was tightly correlated to the spreading rate and spreading area. Thus, T cells can discriminate between fairly similar TCR ligands within 2 min.
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Affiliation(s)
- Alexandre Brodovitch
- Lab Adhesion Cellulaire and Inflammation, Aix-Marseille UniversitéFrance
- INSERM U1067France
- CNRSU7333, France
| | - Eugene Shenderov
- MRC Human Immunology Unit, Weatherall Institute for Molecular Medicine, University of OxfordOxford, UK
| | - Vincenzo Cerundolo
- MRC Human Immunology Unit, Weatherall Institute for Molecular Medicine, University of OxfordOxford, UK
| | - Pierre Bongrand
- Lab Adhesion Cellulaire and Inflammation, Aix-Marseille UniversitéFrance
- INSERM U1067France
- CNRSU7333, France
- Assistance Publique, Hôpitaux de MarseilleFrance
| | - Anne Pierres
- Lab Adhesion Cellulaire and Inflammation, Aix-Marseille UniversitéFrance
- INSERM U1067France
- CNRSU7333, France
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Agabriel C, Ghazouani O, Birnbaum J, Liabeuf V, Porri F, Gouitaa M, Cleach I, Grob JJ, Bongrand P, Sarles J, Vitte J. Ara h 2 and Ara h 6 sensitization predicts peanut allergy in Mediterranean pediatric patients. Pediatr Allergy Immunol 2014; 25:662-7. [PMID: 25376086 DOI: 10.1111/pai.12299] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/03/2014] [Indexed: 01/03/2023]
Abstract
BACKGROUND Peanut allergy (PA) management was improved by the introduction of molecular allergology, but guidelines for Mediterranean patients are lacking. We aimed at evaluating peanut component-resolved diagnosis as a diagnostic and prognostic tool in children from Southern France. METHODS In 181 pediatric patients, PA diagnosis was founded on medical history, skin prick testing, serum-specific IgE to Arachis hypogea extract and components, Pru p 4, and plant carbohydrates, and oral food challenge. Allergen microarray was also performed in 68 of these patients. RESULTS In peanut-allergic children (n = 117), IgE to Ara h 6 were most prevalent (64%), followed by Ara h 2 (63%), Ara h 1 (60%), and Ara h 9 (52%). Ara h 6 was the best predictor of PA. The second best predictor was the ratio of Ara h 2 IgE to peanut IgE (cutoff 0.113). Persistent childhood PA was associated with complex molecular profiles. Comparison of singleplex and microarray results showed poor concordance for Ara h 2 and Ara h 9. CONCLUSION Ara h 6 and Ara h 2 are the best predictors of PA at diagnosis in Mediterranean pediatric patients. Ara h 1, Ara h 8, and molecular complexity are associated with PA persistence.
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Affiliation(s)
- Chantal Agabriel
- Multidisciplinary Pediatrics Department, APHM Assistance Publique Hôpitaux de Marseille, La Timone Hospital, Marseille, France
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Brodovitch A, Limozin L, Bongrand P, Pierres A. Use of TIRF to Monitor T-Lymphocyte Membrane Dynamics with Submicrometer and Subsecond Resolution. Cell Mol Bioeng 2014; 8:178-186. [PMID: 25798205 PMCID: PMC4361759 DOI: 10.1007/s12195-014-0361-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Accepted: 10/04/2014] [Indexed: 11/29/2022] Open
Abstract
A key step of adaptive immune responses is the T lymphocyte capacity to detect the presence of foreign antigens on specialized cells with high speed and specificity during contacts lasting a few minutes. Much evidence suggests that there is a deep link between the lifetime of molecular interactions between T cell receptors and ligands and T cell activation, but the precise mechanisms of bond formation and dissociation remain incompletely understood. Previous experiments done with interference reflection microscopy/reflection interference contrast microscopy disclosed transverse motions with several nanometer average amplitude of micrometer size membrane zones. More recently, total internal reflection fluorescence microscopy was used to show that the initial interaction between primary T lymphocytes and model surfaces involved the tip of microvilli (typically 0.2 µm2 area) generating apparent contacts of a few seconds that allowed cells to detect ligands of their membrane receptors. Here we show that these microvilli displayed minimal lateral displacements but quantitative fluorescence measurement suggested the occurrence of spontaneous transverse fluctuations of order of 67 nm amplitude during 1-s observation periods. This may play a major role in membrane receptor engagement and ensuing signal generation.
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Affiliation(s)
- Alexandre Brodovitch
- Laboratoire Adhésion et Inflammation, Parc Scientifique de Luminy, Aix-Marseille Université, INSERM U1067, Case 937, 13288 Marseille Cedex 09, France ; INSERM U 1067, 13288 Marseille Cedex 09, France ; CNRS U 7333, 13288 Marseille Cedex 09, France
| | - Laurent Limozin
- Laboratoire Adhésion et Inflammation, Parc Scientifique de Luminy, Aix-Marseille Université, INSERM U1067, Case 937, 13288 Marseille Cedex 09, France ; INSERM U 1067, 13288 Marseille Cedex 09, France ; CNRS U 7333, 13288 Marseille Cedex 09, France
| | - Pierre Bongrand
- Laboratoire Adhésion et Inflammation, Parc Scientifique de Luminy, Aix-Marseille Université, INSERM U1067, Case 937, 13288 Marseille Cedex 09, France ; INSERM U 1067, 13288 Marseille Cedex 09, France ; CNRS U 7333, 13288 Marseille Cedex 09, France ; Assistance-Publique, Hôpitaux de Marseille, Marseille, France
| | - Anne Pierres
- Laboratoire Adhésion et Inflammation, Parc Scientifique de Luminy, Aix-Marseille Université, INSERM U1067, Case 937, 13288 Marseille Cedex 09, France ; INSERM U 1067, 13288 Marseille Cedex 09, France ; CNRS U 7333, 13288 Marseille Cedex 09, France
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Bégin P, Vitte J, Paradis L, Paradis J, Bongrand P, Chanez P, Des Roches A. Long-term prognostic value of component-resolved diagnosis in infants and toddlers with peanut allergy. Pediatr Allergy Immunol 2014; 25:506-8. [PMID: 24641729 DOI: 10.1111/pai.12216] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Philippe Bégin
- Department of Pediatrics, Allergy and Clinical Immunology Division, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Canada; Department of Medicine, Allergy and Clinical Immunology Unit, Centre Hospitalier de l'Université de Montréal, Montreal, Canada
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Vitte J, Agabriel C, Liabeuf V, Cleach I, Grob JJ, Sarles JJ, Bongrand P. Sequential allergen microarray testing during the follow-up of allergic patients. Clin Transl Allergy 2014. [PMCID: PMC4072171 DOI: 10.1186/2045-7022-4-s2-p48] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
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Despierres L, Beziane A, Kaplanski G, Granel B, Serratrice J, Cohen W, Bretelle F, Rossi P, Morange PE, Weiller PJ, Robert Harlé J, Bongrand P, Bardin N. Contribution of anti-β2glycoprotein I IgA antibodies to the diagnosis of anti-phospholipid syndrome: potential interest of target domains to discriminate thrombotic and non-thrombotic patients. Rheumatology (Oxford) 2014; 53:1215-8. [DOI: 10.1093/rheumatology/keu003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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Abstract
Adaptive immune responses are triggered by the rapid and sensitive detection of MHC-bound peptides by TCRs. The kinetics of early TCR/APC contacts are incompletely known. In this study, we used total internal reflection fluorescence microscopy to image human T cell membranes near model surfaces: contact was mediated by mobile protrusions of <0.4 μm diameter. The mean lifetime of contacts with a neutral surface was 8.6 s. Adhesive interactions increased mean contact time to 27.6 s. Additional presence of TCR ligands dramatically decreased contact to 13.7 s, thus evidencing TCR-mediated triggering of a pulling motion within seconds after ligand encounter. After an interaction typically involving 30-40 contacts formed during a 1-min observation period, TCR stimulation triggered a rapid and active cell spreading. Pulling events and cell spreading were mimicked by pharmacological phospholipase Cγ1 activation, and they were prevented by phospholipase Cγ1 inhibition. These results provide a quantitative basis for elucidating the earliest cell response to the detection of foreign Ags.
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Affiliation(s)
- Alexandre Brodovitch
- Laboratoire Adhésion Cellulaire et Inflammation, Parc Scientifique de Luminy, Aix-Marseille Université, 13288 Marseille Cedex 09, France
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Vitte J, Bongrand P. Serum tryptase determination in patients with acute allergic reactions. J Allergy Clin Immunol 2013; 131:1714. [DOI: 10.1016/j.jaci.2013.03.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Accepted: 03/13/2013] [Indexed: 10/26/2022]
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Robert P, Touchard D, Bongrand P, Pierres A. Biophysical description of multiple events contributing blood leukocyte arrest on endothelium. Front Immunol 2013; 4:108. [PMID: 23750158 PMCID: PMC3654224 DOI: 10.3389/fimmu.2013.00108] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 04/26/2013] [Indexed: 12/16/2022] Open
Abstract
Blood leukocytes have a remarkable capacity to bind to and stop on specific blood vessel areas. Many studies have disclosed a key role of integrin structural changes following the interaction of rolling leukocytes with surface-bound chemoattractants. However, the functional significance of structural data and mechanisms of cell arrest are incompletely understood. Recent experiments revealed the unexpected complexity of several key steps of cell-surface interaction: (i) ligand-receptor binding requires a minimum amount of time to proceed and this is influenced by forces. (ii) Also, molecular interactions at interfaces are not fully accounted for by the interaction properties of soluble molecules. (iii) Cell arrest depends on nanoscale topography and mechanical properties of the cell membrane, and these properties are highly dynamic. Here, we summarize these results and we discuss their relevance to recent functional studies of integrin-receptor association in cells from a patient with type III leukocyte adhesion deficiency. It is concluded that an accurate understanding of all physical events listed in this review is needed to unravel the precise role of the multiple molecules and biochemical pathway involved in arrest triggering.
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Affiliation(s)
- Philippe Robert
- Laboratoire Adhésion and Inflammation, Aix-Marseille Université Marseille, France ; Institut National de la Santé et de la Recherche Médicale Marseille, France ; Centre National de la Recherche Scientifique Marseille, France ; Laboratoire d'Immunologie, Hôpitaux de Marseille, Hôpital de la Conception Marseille, France
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Million M, Walter G, Bardin N, Camoin L, Giorgi R, Bongrand P, Gouriet F, Casalta JP, Thuny F, Habib G, Raoult D. Immunoglobulin G Anticardiolipin Antibodies and Progression to Q Fever Endocarditis. Clin Infect Dis 2013; 57:57-64. [DOI: 10.1093/cid/cit191] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Bronnert M, Mancini J, Birnbaum J, Agabriel C, Liabeuf V, Porri F, Cleach I, Fabre A, Deneux I, Grandné V, Grob JJ, Berbis P, Charpin D, Bongrand P, Vitte J. Component-resolved diagnosis with commercially available D. pteronyssinus Der p 1, Der p 2 and Der p 10: relevant markers for house dust mite allergy. Clin Exp Allergy 2013; 42:1406-15). [PMID: 22747483 DOI: 10.1111/j.1365-2222.2012.04035.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To establish the prevalence and serum levels of IgE to commercial Der p 1, Der p 2, Der p 10 and the carbohydrate MUXF3 in house dust-mite allergic patients. To compare individual vs. allergen microarray methods. METHODS Prevalence and serum levels of IgE to Dermatophagoides pteronyssinus extract and components Der p 1, Der p 2, Der p 10 and MUXF3, specific IgG4 to D. pteronyssinus, total serum IgE levels, and clinical features (age, asthma, rhinitis and atopic dermatitis) were determined in 123 patients (64 children) with the ImmunoCAP® method. ImmunoCAP ISAC® was performed in 24 patients. RESULTS All patients had serum IgE to D. pteronyssinus. Prevalences of serum IgE to commercial components were Der p 1 93%, Der p 2 77% (Der p 1 or Der p 2 94%), Der p 10 28% and MUXF3 25%. Levels of D. pteronyssinus IgE strongly correlated with Der p 1 and Der p 2 IgE (r = 0.89 and 0.85 respectively), but not Der p 10 and MUXF3. ImmunoCAP® and ImmunoCAP ISAC® were concordant, but the quantitative correlation was poor. No clinical implication for the prevalence, levels, or molecular IgE reactivity profile to house dust mite components was found. CONCLUSIONS AND CLINICAL RELEVANCE Commercially available Der p 1 and Der p 2 strongly correlate with IgE D. pteronyssinus. The lack of Der p 1 and Der p 2 IgE may help with differential diagnosis. Der p 10 serum IgE prevalence and levels suggest different patterns in food and mite-related tropomyosin sensitization. Serum IgE to carbohydrate MUXF3, although unexpectedly prevalent, were low and did not modify D. pteronyssinus IgE levels. Follow-up may be best carried out with individual rather than microarrayed components.
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Affiliation(s)
- M Bronnert
- Laboratoire d’Immunologie, Hôpital Conception 147 bd Baille F-13005 Marseille, France
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Crétel⁎ E, Pierres A, Bongrand P, Robert P, Loundou A, Baumstarck-Barrau K, Villani P, Bonin-Guillaume S. Immunosenescence study in old polypathological patients. J Geriatr Oncol 2012. [DOI: 10.1016/j.jgo.2012.10.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Lo Schiavo V, Robert P, Limozin L, Bongrand P. Quantitative modeling assesses the contribution of bond strengthening, rebinding and force sharing to the avidity of biomolecule interactions. PLoS One 2012; 7:e44070. [PMID: 23024747 PMCID: PMC3443103 DOI: 10.1371/journal.pone.0044070] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Accepted: 07/30/2012] [Indexed: 12/23/2022] Open
Abstract
Cell adhesion is mediated by numerous membrane receptors. It is desirable to derive the outcome of a cell-surface encounter from the molecular properties of interacting receptors and ligands. However, conventional parameters such as affinity or kinetic constants are often insufficient to account for receptor efficiency. Avidity is a qualitative concept frequently used to describe biomolecule interactions: this includes incompletely defined properties such as the capacity to form multivalent attachments. The aim of this study is to produce a working description of monovalent attachments formed by a model system, then to measure and interpret the behavior of divalent attachments under force. We investigated attachments between antibody-coated microspheres and surfaces coated with sparse monomeric or dimeric ligands. When bonds were subjected to a pulling force, they exhibited both a force-dependent dissociation consistent with Bell’s empirical formula and a force- and time-dependent strengthening well described by a single parameter. Divalent attachments were stronger and less dependent on forces than monovalent ones. The proportion of divalent attachments resisting a force of 30 piconewtons for at least 5 s was 3.7 fold higher than that of monovalent attachments. Quantitative modeling showed that this required rebinding, i.e. additional bond formation between surfaces linked by divalent receptors forming only one bond. Further, experimental data were compatible with but did not require stress sharing between bonds within divalent attachments. Thus many ligand-receptor interactions do not behave as single-step reactions in the millisecond to second timescale. Rather, they exhibit progressive stabilization. This explains the high efficiency of multimerized or clustered receptors even when bonds are only subjected to moderate forces. Our approach provides a quantitative way of relating binding avidity to measurable parameters including bond maturation, rebinding and force sharing, provided these parameters have been determined. Also, this provides a quantitative description of the phenomenon of bond strengthening.
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Affiliation(s)
- Valentina Lo Schiavo
- Aix-Marseille Université, LAI, Marseille, France
- Inserm UMR 1067, LAI, Marseille France
- CNRS UMR 7333, LAI, Marseille, France
| | - Philippe Robert
- Aix-Marseille Université, LAI, Marseille, France
- Inserm UMR 1067, LAI, Marseille France
- CNRS UMR 7333, LAI, Marseille, France
- Assistance Publique - Hôpitaux de Marseille (APHM), Hôpital de la Conception, Marseille, France
| | - Laurent Limozin
- Aix-Marseille Université, LAI, Marseille, France
- Inserm UMR 1067, LAI, Marseille France
- CNRS UMR 7333, LAI, Marseille, France
| | - Pierre Bongrand
- Aix-Marseille Université, LAI, Marseille, France
- Inserm UMR 1067, LAI, Marseille France
- CNRS UMR 7333, LAI, Marseille, France
- Assistance Publique - Hôpitaux de Marseille (APHM), Hôpital de la Conception, Marseille, France
- * E-mail:
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Thakur S, Massou S, Benoliel AM, Bongrand P, Hanbucken M, Sengupta K. Depth matters: cells grown on nano-porous anodic alumina respond to pore depth. Nanotechnology 2012; 23:255101. [PMID: 22652407 DOI: 10.1088/0957-4484/23/25/255101] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Recent experiments have shown unambiguously that living cells respond to the nano-topography of surfaces they grow on-specifically, the fate of stem cells grown on nano-porous titania or alumina have been shown to be decided by the pore size. However, most experiments have focused on pore size or pitch. Here we show that in addition to pore size and pitch, the depth of the pores has a profound effect on cell morphology and the arrangement of the actin cytoskeleton.
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Affiliation(s)
- S Thakur
- CNRS CINaM UPR 7325, University Aix-Marseille, Marseille Cedex 9, France
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Robert P, Aleksic M, Dushek O, Cerundolo V, Bongrand P, van der Merwe PA. Kinetics and mechanics of two-dimensional interactions between T cell receptors and different activating ligands. Biophys J 2012; 102:248-57. [PMID: 22339861 DOI: 10.1016/j.bpj.2011.11.4018] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Revised: 11/14/2011] [Accepted: 11/17/2011] [Indexed: 12/22/2022] Open
Abstract
Adaptive immune responses are driven by interactions between T cell antigen receptors (TCRs) and complexes of peptide antigens (p) bound to Major Histocompatibility Complex proteins (MHC) on the surface of antigen-presenting cells. Many experiments support the hypothesis that T cell response is quantitatively and qualitatively dependent on the so-called strength of TCR/pMHC association. Most available data are correlations between binding parameters measured in solution (three-dimensional) and pMHC activation potency, suggesting that full lymphocyte activation required a minimal lifetime for TCR/pMHC interaction. However, recent reports suggest important discrepancies between the binding properties of ligand-receptor couples measured in solution (three-dimensional) and those measured using surface-bound molecules (two-dimensional). Other reports suggest that bond mechanical strength may be important in addition to kinetic parameters. Here, we used a laminar flow chamber to monitor at the single molecule level the two-dimensional interaction between a recombinant human TCR and eight pMHCs with variable potency. We found that 1), two-dimensional dissociation rates were comparable to three-dimensional parameters previously obtained with the same molecules; 2), no significant correlation was found between association rates and activating potency of pMHCs; 3), bond mechanical strength was partly independent of bond lifetime; and 4), a suitable combination of bond lifetime and bond strength displayed optimal correlation with activation efficiency. These results suggest possible refinements of contemporary models of signal generation by T cell receptors. In conclusion, we reported, for the first time to our knowledge, the two-dimensional binding properties of eight TCR/pMHC couples in a cell-free system with single bond resolution.
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Affiliation(s)
- Philippe Robert
- Lab Adhesion and Inflammation, INSERM, U 1067, Marseille, France
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Abstract
Despite intensive investigation, the mechanisms of T cell receptor (TCR)-mediated signal generation remain poorly understood. Here we review various dynamic processes at the cell membrane that might critically control this signaling. Firstly, we summarize recent reports providing new information on the sensitivity of TCR/ligand interaction to the membrane environment and particularly to applied forces. Secondly, we review recent evidence that forces and displacements are continuously generated at cell surfaces. Thirdly, we summarize recent experimental evidence demonstrating the capacity of forces to generate signals. Lastly, we provide a quantitative model to exemplify the capacity of dynamic processes to modulate TCR properties such as specificity that were previously difficult to explain with conventional models. It is concluded that the described dynamic processes must be integrated into current models of TCR signaling.
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Affiliation(s)
- Hai-Tao He
- Centre d'Immunologie de Marseille-Luminy, Aix-Marseille University, UM2, Marseille, France
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Robert P, Nicolas A, Aranda-Espinoza S, Bongrand P, Limozin L. Minimal encounter time and separation determine ligand-receptor binding in cell adhesion. Biophys J 2011; 100:2642-51. [PMID: 21641309 DOI: 10.1016/j.bpj.2011.04.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 03/31/2011] [Accepted: 04/04/2011] [Indexed: 10/18/2022] Open
Abstract
The binding properties of biomolecules play a crucial role in many biological phenomena, especially cell adhesion. Whereas the attachment kinetics of soluble proteins is considered well known, complex behavior arises when protein molecules are bound to the cell membrane. We probe the hidden kinetics of ligand-receptor bond formation using single-molecule flow chamber assays and Brownian dynamics simulations. We show that, consistent with our recently proposed hypothesis, association requires a minimum duration of contact between the reactive species. In our experiments, ICAM-1 anchored on a flat substrate binds to anti-ICAM-1 coated onto flowing microbeads. The interaction potential between bead and substrate is measured by microinterferometry and is used as an ingredient to simulate bead movement. Our simulation calculates the duration of ligand-receptor contacts imposed by the bead movement. We quantitatively predict the reduction of adhesion probability measured for shorter tether length of the ligand or if a repulsive hyaluronan layer is added onto the surface. To account for our results, we propose that bond formation may occur in our system by crossing of a diffusive plateau in the energy landscape, on the timescale of 5 ms and an energy barrier of 5 k(B)T, before reaching the first detectable bound state. Our results show how to relate cell-scale behavior to the combined information of molecular reactivity and biomolecule submicron-scale environment.
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Affiliation(s)
- Philippe Robert
- Adhesion & Inflammation, INSERM UMR 600 and Centre National de la Recherche Scientifique UMR 6212, Aix-Marseille University, Campus Luminy, Marseille, France
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Belhocine W, Ibrahim Z, Grandné V, Buffat C, Robert P, Gras D, Cleach I, Bongrand P, Carayon P, Vitte J. Total serum tryptase levels are higher in young infants. Pediatr Allergy Immunol 2011; 22:600-7. [PMID: 21736626 DOI: 10.1111/j.1399-3038.2011.01166.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Mast cells participate in immune defense and allergic disease. At baseline, serum tryptase levels primarily reflect mast cell burden, while mast cell degranulation leads to granule tryptase release, which may be detectable as a transitory elevation of serum tryptase levels. Thus, mast cell burden and mast cell activity are reflected by serum tryptase levels, but reports are scarce in infants under 1 yr. We aimed at defining levels of total serum tryptase levels in this population. METHODS Total serum tryptase levels (ImmunoCAP; Phadia) were measured in 372 sera from infants younger than 1 yr. Two hundred and forty-two sera came from non-atopic, non-allergic infants in good condition, who had blood drawn for routine follow-up or diagnosis of illnesses that are not known to induce changes in serum tryptase levels. Seventy-two sera were from atopic and/or allergic infants, and 58 sera were from non-atopic, non-allergic infants requiring intensive care. RESULTS Median serum tryptase levels were highest in infant2s under 3 months (6.12 ± 3.47 μg/l) and gradually decreased before reaching levels similar to those described in adults and older children (3.85 ± 1.8 μg/l between 9 and 12 months). Atopic/allergic status was associated with even higher tryptase levels (14.20 ± 10.22 μg/l in infants younger than 3 months). Intensive care patients had lower levels of serum tryptase (4.12 ± 3.38 μg/l in infants younger than 3 months). Longitudinal follow-up was performed in 27 patients and showed tryptase levels decrease over time in individual patients. Infants'sex was not found to interfere with serum tryptase levels. CONCLUSION Total serum tryptase levels are significantly higher in younger infants compared with older ones. In infants of the same age, serum tryptase levels may vary according to the clinical condition and thus suggest mast cell involvement in the physiologic as well as in the allergic immune responses of young infants.
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Affiliation(s)
- Wahib Belhocine
- Assistance Publique-Hôpitaux de Marseille, Laboratoire d'Immunologie, Hôpital de La Conception, Marseille, France
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25
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Puech PH, Nevoltris D, Robert P, Limozin L, Boyer C, Bongrand P. Force measurements of TCR/pMHC recognition at T cell surface. PLoS One 2011; 6:e22344. [PMID: 21799834 PMCID: PMC3142151 DOI: 10.1371/journal.pone.0022344] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Accepted: 06/25/2011] [Indexed: 01/07/2023] Open
Abstract
The rupture forces and adhesion frequencies of single recognition complexes between an affinity selected peptide/MHC complex and a TCR at a murine hybridoma surface were measured using Atomic Force Microscopy. When the CD8 coreceptor is absent, the adhesion frequency depends on the nature of the peptide but the rupture force does not. When CD8 is present, no effect of the nature of the peptide is observed. CD8 is proposed to act as a time and distance lock, enabling the shorter TCR molecule to bridge the pMHC and have time to finely read the peptide. Ultimately, such experiments could help the dissection of the sequential steps by which the TCR reads the peptide/MHC complex in order to control T cell activation.
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Affiliation(s)
- Pierre-Henri Puech
- Laboratoire Adhésion et Inflammation, Parc Scientifique et Technologique de Luminy, Marseille, France.
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Robert P, Canault M, Farnarier C, Nurden A, Grosdidier C, Barlogis V, Bongrand P, Pierres A, Chambost H, Alessi MC. A novel leukocyte adhesion deficiency III variant: kindlin-3 deficiency results in integrin- and nonintegrin-related defects in different steps of leukocyte adhesion. J Immunol 2011; 186:5273-83. [PMID: 21441448 DOI: 10.4049/jimmunol.1003141] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Leukocyte adhesion deficiency type III is a recently described condition involving a Glanzmann-type bleeding syndrome and leukocyte adhesion deficiency. This was ascribed to a defect of the FERMT3 gene resulting in abnormal expression of kindlin-3, a protein expressed in hematopoietic cells with a major role in the regulation of integrin activation. In this article, we describe a patient with a new mutation of FERMT3 and lack of kindlin-3 expression in platelets and leukocytes. We assayed quantitatively the first steps of kindlin-3-defective leukocyte adhesion, namely, initial bond formation, bond strengthening, and early spreading. Initial bond formation was readily stimulated with neutrophils stimulated by fMLF, and neutrophils and lymphocytes stimulated by a phorbol ester or Mn(2+). In contrast, attachment strengthening was defective in the patient's lymphocytes treated with PMA or Mn(2+), or fMLF-stimulated neutrophils. However, attachment strengthening was normal in patient's neutrophils treated with phorbol ester or Mn(2+). In addition, the patient's T lymphocytes displayed defective integrin-mediated spreading and a moderate but significant decrease of spreading on anti-CD3-coated surfaces. Patient's neutrophils displayed a drastic alteration of integrin-mediated spreading after fMLF or PMA stimulation, whereas signaling-independent Mn(2+) allowed significant spreading. In conclusion, the consequences of kindlin-3 deficiency on β(2) integrin function depend on both cell type and the stimulus used for integrin activation. Our results suggest looking for a possible kindlin-3 involvement in membrane dynamical event independent of integrin-mediated adhesion.
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Affiliation(s)
- Philippe Robert
- Laboratoire d'Immunologie, Hôpital de la Conception, Assistance Publique-Hôpitaux de Marseille, 13385 Marseille Cedex 05, France
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Cretel E, Touchard D, Bongrand P, Pierres A. A new method for rapid detection of T lymphocyte decision to proliferate after encountering activating surfaces. J Immunol Methods 2011; 364:33-9. [DOI: 10.1016/j.jim.2010.10.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Revised: 09/16/2010] [Accepted: 10/19/2010] [Indexed: 12/13/2022]
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Affiliation(s)
- C Agabriel
- Service de Pédiatrie Multidisciplinaire, Hôpital de la Timone, Assistance Publique Hôpitaux de Marseille, France
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Abstract
Cells continually probe their environment to adapt their behaviour. A current challenge is to determine how they analyse nearby surfaces and how they process information to take decisions. We addressed this problem by monitoring human T lymphocyte attachment to surfaces coated with activating anti-CD3 or control anti-HLA antibodies. Interference reflection microscopy allowed us to monitor cell-to-surface apposition with a few nanometre vertical resolution during the first minutes following contact. We found that (i) when a cell fell on a surface, contact extension was preceded by a lag of several tens of seconds. (ii) During this lag, vertical membrane undulations seemed to generate transient contacts with underlying surfaces. (iii) After the lag period, the contact area started increasing linearly with a rate of about 1.5 µm(2) s(-1) on activating surfaces and about 0.2 µm(2) s(-1) on control surfaces. (iv) Concomitantly with lateral surface extension, the apparent distance between cell membranes and surfaces steadily decreased. These results are consistent with the hypothesis that the cell decision to spread rapidly on activating surfaces resulted from the integration of information yielded by transient contacts with these surfaces generated by membrane undulations during a period of about 1 min.
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Affiliation(s)
- E Cretel
- INSERM UMR 600, Laboratory Adhesion and Inflammation, Parc Scientifique de Luminy, Marseille, France
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D’Journo XB, Michelet P, Marin V, Diesnis I, Blayac D, Doddoli C, Bongrand P, Thomas PA. An early inflammatory response to oesophagectomy predicts the occurrence of pulmonary complications☆. Eur J Cardiothorac Surg 2010; 37:1144-51. [DOI: 10.1016/j.ejcts.2009.11.033] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Revised: 10/01/2009] [Accepted: 11/02/2009] [Indexed: 11/25/2022] Open
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Cabantous S, Poudiougou B, Oumar AA, Traore A, Barry A, Vitte J, Bongrand P, Marquet S, Doumbo O, Dessein AJ. Genetic evidence for the aggravation of Plasmodium falciparum malaria by interleukin 4. J Infect Dis 2009; 200:1530-9. [PMID: 19835477 DOI: 10.1086/644600] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Severe malaria (SM) due to Plasmodium falciparum causes millions of child deaths in sub-Saharan Africa. It comprises a variety of clinical disorders, including cerebral malaria (CM) and severe anemia (SA). In previous work, we have shown that interferon gamma and interleukin 12 protect against CM. Here, we investigated whether interleukin 4 (IL-4) aggravates the risk of severe disease. METHODS We prospectively recruited children with CM (n = 240), SA (n = 101), and uncomplicated malaria (UM) (n = 42) in Bamako, Mali, and measured IL-4 production in plasma by enzyme-linked immunosorbent assay. We then assessed the influence of 11 polymorphisms on predisposition to SM by the family-based association test (FBAT). RESULTS IL-4 concentrations were higher in children with CM than in children with UM during malaria (P = .003). FBAT analyses showed that the most significant association was between the IL4 variable-number tandem repeat (VNTR) 1/2 genotype and SM (P < .001); an association was also observed for IL4 -33 C/T, rs2243267 G/C, rs2243268 C/A, and rs2243282 C/A (P < .05). Interestingly, we found that the plasma concentration of IL-4 was higher in subjects with the IL4 VNTR 1/2 or 1/1 genotype than with the IL4 VNTR 2/2 genotype (P = .003). CONCLUSIONS These results support the view that IL-4 may be a risk factor for SM. IL-4 may aggravate the disease by interfering with type 1 T helper cell differentiation or by promoting local inflammation at sites of parasite sequestration.
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Affiliation(s)
- Sandrine Cabantous
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 906, Faculté de Médecine, Aix-Marseille Université, IFR88, 27 blvd. Jean Moulin, Marseille, France.
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Robert P, Limozin L, Pierres A, Bongrand P. Biomolecule association rates do not provide a complete description of bond formation. Biophys J 2009; 96:4642-50. [PMID: 19486686 DOI: 10.1016/j.bpj.2009.03.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Revised: 02/19/2009] [Accepted: 03/23/2009] [Indexed: 02/03/2023] Open
Abstract
The efficiency of many cell-surface receptors is dependent on the rate of binding soluble or surface-attached ligands. Much effort was exerted to measure association rates between soluble molecules (three-dimensional k(on)) and, more recently, between surface-attached molecules (two-dimensional [2D] k(on)). According to a generally accepted assumption, the probability of bond formation between receptors and ligands is proportional to the first power of encounter duration. Here we provide new experimental evidence and review published data demonstrating that this simple assumption is not always warranted. Using as a model system the (2D) interaction between ICAM-1-coated surfaces and flowing microspheres coated with specific anti-ICAM-1 antibodies, we show that the probability of bond formation may scale as a power of encounter duration that is significantly higher than 1. Further, we show that experimental data may be accounted for by modeling ligand-receptor interaction as a displacement along a single path of a rough energy landscape. Under a wide range of conditions, the probability that an encounter of duration t resulted in bond formation varied as erfc[(t(0)/t)(1/2)], where t(0) was on the order of 10 ms. We conclude that the minimum contact time for bond formation may be a useful parameter to describe a ligand-receptor interaction, in addition to conventional association rates.
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Affiliation(s)
- Philippe Robert
- Laboratory Adhesion et Inflammation, Institut national de santé et de recherche medicale (INSERM) UMR600, Parc Scientifique de Luminy, 13288 Marseille Cedex 09, France
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Gabriele S, Benoliel AM, Bongrand P, Théodoly O. Microfluidic investigation reveals distinct roles for actin cytoskeleton and myosin II activity in capillary leukocyte trafficking. Biophys J 2009; 96:4308-18. [PMID: 19450501 DOI: 10.1016/j.bpj.2009.02.037] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2008] [Revised: 02/03/2009] [Accepted: 02/17/2009] [Indexed: 02/03/2023] Open
Abstract
Circulating leukocyte sequestration in pulmonary capillaries is arguably the initiating event of lung injury in acute respiratory distress syndrome. We present a microfluidic investigation of the roles of actin organization and myosin II activity during the different stages of leukocyte trafficking through narrow capillaries (entry, transit and shape relaxation) using specific drugs (latrunculin A, jasplakinolide, and blebbistatin). The deformation rate during entry reveals that cell stiffness depends strongly on F-actin organization and hardly on myosin II activity, supporting a microfilament role in leukocyte sequestration. In the transit stage, cell friction is influenced by stiffness, demonstrating that the actin network is not completely broken after a forced entry into a capillary. Conversely, membrane unfolding was independent of leukocyte stiffness. The surface area of sequestered leukocytes increased by up to 160% in the absence of myosin II activity, showing the major role of molecular motors in microvilli wrinkling and zipping. Finally, cell shape relaxation was largely independent of both actin organization and myosin II activity, whereas a deformed state was required for normal trafficking through capillary segments.
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Affiliation(s)
- Sylvain Gabriele
- Université de la Méditerranée, Institut National de la Santé et de la Recherche Médicale INSERM U600-Centre National de la Recherche Scientifique CNRS UMR6212, Marseille, France
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Sengupta K, Moyen E, Macé M, Benoliel AM, Pierres A, Thibaudau F, Masson L, Limozin L, Bongrand P, Hanbücken M. Large-scale ordered plastic nanopillars for quantitative live-cell imaging. Small 2009; 5:449-453. [PMID: 19189324 DOI: 10.1002/smll.200800836] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Affiliation(s)
- Kheya Sengupta
- Centre Interdisciplinaire de Nanosciences de Marseille CINaM UPR CNRS 3118, Aix-Marseille Université Campus de Luminy 13288 Marseille cedex 9, France.
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Benkoël L, Bernard JP, Payan-Defais MJ, Crescence L, Franceschi C, Delmas M, Ouaissi M, Sastre B, Sahel J, Benoliel AM, Bongrand P, Silvy F, Gauthier L, Romagné F, Lombardo D, Mas E. Monoclonal antibody 16D10 to the COOH-terminal domain of the feto-acinar pancreatic protein targets pancreatic neoplastic tissues. Mol Cancer Ther 2009; 8:282-91. [DOI: 10.1158/1535-7163.mct-08-0471] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Gabriele S, Benoliel AM, Bongrand P, Theodoly O. Microfluidic Investigation Reveals Distinct Roles for Actin Cytoskeleton and Myosin II Activity in Capillary Leukocyte Trafficking. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Altschuh D, Bongrand P. Studying Molecular Interactions, a First Step Toward Cellular and Molecular Bioengineering. Cell Mol Bioeng 2008. [DOI: 10.1007/s12195-008-0033-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Vitte J, Bongrand P. Anaphylaxie fatale au lait de brebis : place de la biologie. Arch Pediatr 2008; 15:1300-3. [DOI: 10.1016/j.arcped.2008.04.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2007] [Revised: 03/10/2008] [Accepted: 04/30/2008] [Indexed: 11/28/2022]
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Robert P, Benoliel AM, Pierres A, Bongrand P. What is the biological relevance of the specific bond properties revealed by single-molecule studies? J Mol Recognit 2008; 20:432-47. [PMID: 17724759 DOI: 10.1002/jmr.827] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
During the last decade, many authors took advantage of new methodologies based on atomic force microscopy (AFM), biomembrane force probes (BFPs), laminar flow chambers or optical traps to study at the single-molecule level the formation and dissociation of bonds between receptors and ligands attached to surfaces. Experiments provided a wealth of data revealing the complexity of bond response to mechanical forces and the dependence of bond rupture on bond history. These results supported the existence of multiple binding states and/or reaction pathways. Also, single bond studies allowed us to monitor attachments mediated by a few bonds. The aim of this review is to discuss the impact of this new information on our understanding of biological molecules and phenomena. The following points are discussed: (i) which parameters do we need to know in order to predict the behaviour of an encounter between receptors and ligands, (ii) which information is actually yielded by single-molecule studies and (iii) is it possible to relate this information to molecular structure?
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Pierres A, Prakasam A, Touchard D, Benoliel AM, Bongrand P, Leckband D. Dissecting subsecond cadherin bound states reveals an efficient way for cells to achieve ultrafast probing of their environment. FEBS Lett 2007; 581:1841-6. [PMID: 17434495 PMCID: PMC1995029 DOI: 10.1016/j.febslet.2007.03.077] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2007] [Accepted: 03/22/2007] [Indexed: 10/23/2022]
Abstract
Cells continuously probe their environment with membrane receptors, achieving subsecond adaptation of their behaviour [Diez, G., Gerisch, G., Anderson, K., Müller-Taubenberger, A. and Bretschneider, T. (2006) Subsecond reorganization of the actin network in cell motility and chemotaxis. Proc. Natl. Acad. Sci. USA 102, 7601-7606, Shamri, R., Grabovsky, V., Gauguet, J.M., Feigelson, S., Manevich, E., Kolanus, W., Robinson, M.K., Staunton, D.E., von Andrian, U.H. and Alon, R. (2005) Lymphocyte arrest requires instantaneous induction of an extended LFA-1 conformation mediated by endothelium-bound chemokines. Nat. Immunol. 6, 497-606, Jiang, G., Huang, A.H., Cai, Y., Tanase, M. and Sheetz, M.P. (2006) Rigidity sensing at the leading edge through alpha(V)beta(3) integrins and RPTPalpha. Biophys. J. 90, 1804-2006]. Recently, several receptors, including cadherins, were found to bind ligands with a lifetime of order of one second. Here we show at the single molecule level that homotypic C-cadherin association involves transient intermediates lasting less than a few tens of milliseconds. Further, these intermediates transitionned towards more stable states with a kinetic rate displaying exponential decrease with piconewton forces. These features enable cells to detect ligands or measure surrounding mechanical behaviour within a fraction of a second, much more rapidly than was previously thought.
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Affiliation(s)
- Anne Pierres
- INSERM U600, Marseille, F-13009, France
- CNRS, UMR 6212, Marseille F-13009, France
- Aix-Marseille Université, Marseille F-13009, France
| | - Anil Prakasam
- Department of Chemical and Biomedical Engineering and Department of chemistry, University of Illinois, Urbana-Champaign, Illinois 61801
| | - Dominique Touchard
- INSERM U600, Marseille, F-13009, France
- CNRS, UMR 6212, Marseille F-13009, France
- Aix-Marseille Université, Marseille F-13009, France
| | - Anne-Marie Benoliel
- INSERM U600, Marseille, F-13009, France
- CNRS, UMR 6212, Marseille F-13009, France
- Aix-Marseille Université, Marseille F-13009, France
| | - Pierre Bongrand
- INSERM U600, Marseille, F-13009, France
- CNRS, UMR 6212, Marseille F-13009, France
- Aix-Marseille Université, Marseille F-13009, France
| | - Deborah Leckband
- Department of Chemical and Biomedical Engineering and Department of chemistry, University of Illinois, Urbana-Champaign, Illinois 61801
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Forel JM, Roch A, Marin V, Michelet P, Demory D, Blache JL, Perrin G, Gainnier M, Bongrand P, Papazian L. Neuromuscular blocking agents decrease inflammatory response in patients presenting with acute respiratory distress syndrome*. Crit Care Med 2006; 34:2749-57. [PMID: 16932229 DOI: 10.1097/01.ccm.0000239435.87433.0d] [Citation(s) in RCA: 242] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To evaluate the effects of neuromuscular blocking agents (NMBAs) on pulmonary and systemic inflammation in patients with acute respiratory distress syndrome ventilated with a lung-protective strategy. DESIGN Multiple-center, prospective, controlled, and randomized trial. SETTING One medical and two medical-surgical intensive care units. PATIENTS A total of 36 patients with acute respiratory distress syndrome (Pao2/Fio2 ratio of < or =200 at a positive end-expiratory pressure of > or =5 cm H2O) were included within 48 hrs of acute respiratory distress syndrome onset. INTERVENTIONS Patients were randomized to receive conventional therapy plus placebo (n = 18) or conventional therapy plus NMBAs (n = 18) for 48 hrs. Both groups were ventilated with a lung-protective strategy (tidal volume between 4 and 8 mL/kg ideal body weight, plateau pressure of < or =30 cm H2O). MEASUREMENTS AND MAIN RESULTS Bronchoalveolar lavages and blood samples were performed, before randomization and at 48 hrs, to determine the concentrations of tumor necrosis factor-alpha, interleukin (IL)-1beta, IL-6, and IL-8. Pao2/Fio2 ratio was evaluated before randomization and at 24, 48, 72, 96, and 120 hrs. A decrease over time in IL-8 concentrations (p = .034) was observed in the pulmonary compartment of the NMBA group. At 48 hrs after randomization, pulmonary concentrations of IL-1beta (p = .005), IL-6 (p = .038), and IL-8 (p = .017) were lower in the NMBA group as compared with the control group. A decrease over time in IL-6 (p = .05) and IL-8 (p = .003) serum concentrations was observed in the NMBA group. At 48 hrs after randomization, serum concentrations of IL-1beta (p = .037) and IL-6 (p = .041) were lower in the NMBA group as compared with the control group. A sustained improvement in Pao2/Fio2 ratio was observed and was reinforced in the NMBA group (p < .001). CONCLUSION Early use of NMBAs decrease the proinflammatory response associated with acute respiratory distress syndrome and mechanical ventilation.
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Affiliation(s)
- Jean-Marie Forel
- Réanimation Médicale, Assistance Publique Hôpitaux de Marseille, Hôpital Sainte Marguerite, Marseille, France
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Marin V, Saraga J, Ariano R, Chouquet D, Dispard M, Bongrand P, Panzani RC. Allergic memory of patients sensitized to castor bean after a long stimulation-free period. J Asthma 2006; 43:193-8. [PMID: 16754520 DOI: 10.1080/02770900600566686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
We have taken advantage of the temporary exposure of Marseilles population to castor bean seed proteins to follow 26 allergic patients more than 20 years after sensitization. Skin tests, specific immunoglobulin E (IgE) antibody assays, and specific immunoblots were performed. Skin test reactivity to Ricinus Communis and specific IgE concentrations decreased progressively and almost completely disappeared after 20 years. Specific IgE concentration displayed a fairly exponential decrease, with a half-life of 4.7 years. Thus, in the absence of any antigenic stimulation, directly by castor bean, or indirectly by cross-reactivity to other Euphorbiaceae, especially latex, IgE sensitization is bound to disappear.
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Affiliation(s)
- Valérie Marin
- Laboratoire d'immunologie, Université de la Méditerranée, Hôpital de Sainte Marguerite, Marseille, France.
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Pierres A, Vitte J, Benoliel AM, Bongrand P. Analysis of ligand-receptor interactions at the single bond level with a laminar flow chamber. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)83927-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Papazian L, Gainnier M, Marin V, Donati S, Arnal JM, Demory D, Roch A, Forel JM, Bongrand P, Brégeon F, Sainty JM. Comparison of prone positioning and high-frequency oscillatory ventilation in patients with acute respiratory distress syndrome*. Crit Care Med 2005; 33:2162-71. [PMID: 16215365 DOI: 10.1097/01.ccm.0000181298.05474.2b] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Both prone position and high-frequency oscillatory ventilation (HFOV) have the potential to facilitate lung recruitment, and their combined use could thus be synergetic on gas exchange. Keeping the lung open could also potentially be lung protective. The aim of this study was to compare physiologic and proinflammatory effects of HFOV, prone positioning, or their combination in severe acute respiratory distress syndrome (ARDS). DESIGN : Prospective, comparative randomized study. SETTING A medical intensive care unit. PATIENTS Thirty-nine ARDS patients with a Pao2/Fio2 ratio <150 mm Hg at positive end-expiratory pressure > or =5 cm H2O. INTERVENTIONS After 12 hrs on conventional lung-protective mechanical ventilation (tidal volume 6 mL/kg of ideal body weight, plateau pressure not exceeding the upper inflection point, and a maximum of 35 cm H2O; supine-CV), 39 patients were randomized to receive one of the following 12-hr periods: conventional lung-protective mechanical ventilation in prone position (prone-CV), HFOV in supine position (supine-HFOV), or HFOV in prone position (prone-HFOV). MEASUREMENTS AND MAIN RESULTS Prone-CV (from 138 +/- 58 mm Hg to 217 +/- 110 mm Hg, p < .0001) and prone-HFOV (from 126 +/- 40 mm Hg to 227 +/- 64 mm Hg, p < 0.0001) improved the Pao2/Fio2 ratio whereas supine-HFOV did not alter the Pao2/Fio2 ratio (from 134 +/- 57 mm Hg to 138 +/- 48 mm Hg). The oxygenation index ({mean airway pressure x Fio2 x 100}/Pao2) decreased in the prone-CV and prone-HFOV groups and was lower than in the supine-HFOV group. Interleukin-8 increased significantly in the bronchoalveolar lavage fluid (BALF) in supine-HFOV and prone-HFOV groups compared with prone-CV and supine-CV. Neutrophil counts were higher in the supine-HFOV group than in the prone-CV group. CONCLUSIONS Although HFOV in the supine position does not improve oxygenation or lung inflammation, the prone position increases oxygenation and reduces lung inflammation in ARDS patients. Prone-HFOV produced similar improvement in oxygenation like prone-CV but was associated with higher BALF indexes of inflammation. In contrast, supine-HFOV did not improve gas exchange and was associated with enhanced lung inflammation.
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Affiliation(s)
- Laurent Papazian
- Service de Réanimation Médicale, Hôpital Sainte-Marguerite, Faculté de Médecine de Marseille, Université de la Méditerranée, Marseille, France
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Vitte J, Benoliel AM, Eymeric P, Bongrand P, Pierres A. Beta-1 integrin-mediated adhesion may be initiated by multiple incomplete bonds, thus accounting for the functional importance of receptor clustering. Biophys J 2005; 86:4059-74. [PMID: 15189901 PMCID: PMC1304306 DOI: 10.1529/biophysj.103.038778] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The regulation of cell integrin receptors involves modulation of membrane expression, shift between different affinity states, and topographical redistribution on the cell membrane. Here we attempted to assess quantitatively the functional importance of receptor clustering. We studied beta-1 integrin-mediated attachment of THP-1 cells to fibronectin-coated surfaces under low shear flow. Cells displayed multiple binding events with a half-life of the order of 1 s. The duration of binding events after the first second after arrest was quantitatively accounted for by a model assuming the existence of a short-time intermediate binding state with 3.6 s(-1) dissociation rate and 1.3 s(-1) transition frequency toward a more stable state. Cell binding to surfaces coated with lower fibronectin densities was concluded to be mediated by single molecular interactions, whereas multiple bonds were formed <1 s after contact with higher fibronectin surface densities. Cell treatment with microfilament inhibitors or a neutral antiintegrin antibody decreased bond number without changing aforementioned kinetic parameters whereas a function enhancing antibody increased the rate of bond formation and/or the lifetime of intermediate state. Receptor aggregation was induced by treating cells with neutral antiintegrin antibody and antiimmunoglobulin antibodies. A semiquantitative confocal microscopy study suggested that this treatment increased between 40% and 100% the average number of integrin receptors located in a volume of approximately 0.045 microm(3) surrounding each integrin. This aggregation induced up to 2.7-fold increase of the average number of bonds. Flow cytometric analysis of fluorescent ligand binding showed that THP-1 cells displayed low-affinity beta-1 integrins with a dissociation constant in the micromolar range. It is concluded that the initial step of cell adhesion was mediated by multiple incomplete bonds rather than a single equilibrium-state ligand receptor association. This interpretation accounts for the functional importance of integrin clustering.
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Affiliation(s)
- Joana Vitte
- Laboratoire d'Immunologie, Institut National de la Sante et de la Recherche Medicale U600, Centre National de la Recherche Scientifique FRE2059, Hopital de Ste-Marguerite, Marseille, France
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Vitte J, Benoliel AM, Pierres A, Bongrand P. Regulation of cell adhesion. Clin Hemorheol Microcirc 2005; 33:167-88. [PMID: 16215283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Cell function usually requires an accurate control of attachment to and detachment from many other cells or biological surfaces. This is usually achieved by a combination of multiple cell processes the relative importance of which may be difficult to assess. The aim of this review is to discuss the role of different mechanisms used to control adhesion on the basis of selected examples and recently developed methodologies allowing quantitative study of cell adhesion. It is concluded that cells control adhesion by modifying (i) adhesion receptor expression, as a consequence of exocytosis, endocytosis, or proteolytic mechanisms, (ii) adhesion receptor intrinsic activity, through a variety of conformational changes, (iii) receptor organisation in cell membranes, as a consequence of topographical distribution and clustering, lateral mobility, and strength of anchoring to the cytoskeleton, and (iv) general processes unrelated to a specific receptors, such as glycocalyx changes or modification of cell shape or surface mechanical properties.
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Affiliation(s)
- Joana Vitte
- Laboratoire d'Immunologie, INSERM UMR600, CNRS FRE2059, Hôpital de Sainte-Marguerite, BP 29, 13274 Marseille cedex 09, France
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Abstract
Alzheimer's and Parkinson's diseases are the most common neurodegenerative conditions. Oxidative lesions are a hallmark of both diseases, but the respective roles of systemic and cerebral dysfunction are not elucidated. As circulating neutrophils are the most powerful sources of reactive oxygen species, we measured oxidative stress levels in resting neutrophils from 44 Alzheimer's and Parkinson's disease patients and compared them to 40 healthy counterparts. Significantly increased oxidative stress levels were observed in patients' groups, while control groups had very similar levels irrespective of age. One-third of the neurodegenerative patients presented with oxidative stress levels higher than those of any healthy donor. This increase was not due to an elevated production of reactive oxygen species during the neutrophil oxidative burst. Mitochondrial mass and activity were altered in neutrophils of the Parkinsonian group compared to controls, but not in those from Alzheimer's disease group. To our knowledge, this is the first report linking oxidative stress and mitochondrial parameters in circulating neutrophils from neurodegenerative and normal donors. Our results indicate that oxidative stress levels in circulating neutrophils are of interest for further mechanistic studies of neurodegenerative diseases and might open the perspective of a diagnostic tool.
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Affiliation(s)
- Joana Vitte
- Laboratoire d'Immunologie, INSERM UMR 600/CNRS FRE 2059, APHM Hôpital Sainte-Marguerite, 270, boulevard de Sainte-Marguerite, 13274, Marseille 09, France.
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Vitte J, Pierres A, Benoliel AM, Bongrand P. Direct quantification of the modulation of interaction between cell- or surface-bound LFA-1 and ICAM-1. J Leukoc Biol 2004; 76:594-602. [PMID: 15240749 DOI: 10.1189/jlb.0204077] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The functional activity of leukocyte integrins is highly regulated by several mechanisms related to intrinsic molecular properties and receptor interaction with the cell membrane. Here, we present a microkinetic study of the lymphocyte function-associated antigen-1-mediated interaction between flowing Jurkat cells and surface- or cell-bound intercellular adhesion molecule-1 (ICAM-1). We conclude that adhesion is initiated by the formation of a single bond with approximately 0.3 s(-1) dissociation rate, and attachment is subsequently strengthened by the formation of additional bonds during the next 10 s; exposing cells to Mg2+ or Mn2+ resulted in up to a 16-fold increase of the binding frequency, in line with reported measurements performed on isolated molecules with surface plasmon resonance methodology; cell-bound ICAM-1 molecules were more efficient in mediating adhesion than Fc-ICAM-1, properly oriented and bound by surface-adsorbed protein A; and quantitative analysis of binding frequency suggested that adhesion efficiency was ten- to 100-fold lower than the maximum value allowed by previously determined association rates of soluble molecules. It is concluded that the presented methodology provides a simple and unique way of dissecting the initial step of cell adhesion and discriminating between affinity and avidity modulation of adhesion receptors.
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Affiliation(s)
- Joana Vitte
- Laboratory of Immunology, INSERM U600, CNRS FRE 2059, Univ. Mediterranée, Hôpital de Ste-Marguerite, 270 Bd de Ste-Marguerite, 13009 France
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