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Roche SM, Holbert S, Le Vern Y, Rossignol C, Rossignol A, Velge P, Virlogeux-Payant I. A large panel of chicken cells are invaded in vivo by Salmonella Typhimurium even when depleted of all known invasion factors. Open Biol 2021; 11:210117. [PMID: 34784793 PMCID: PMC8596019 DOI: 10.1098/rsob.210117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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] [Indexed: 01/04/2023] Open
Abstract
Poultry are the main source of human infection by Salmonella. As infected poultry are asymptomatic, identifying infected poultry farms is difficult, thus controlling animal infections is of primary importance. As cell tropism is known to govern disease, our aim was therefore to identify infected host-cell types in the organs of chicks known to be involved in Salmonella infection and investigate the role of the three known invasion factors in this process (T3SS-1, Rck and PagN). Chicks were inoculated with wild-type or isogenic fluorescent Salmonella Typhimurium mutants via the intracoelomic route. Our results show that liver, spleen, gall bladder and aortic vessels could be foci of infection, and that phagocytic and non-phagocytic cells, including immune, epithelial and endothelial cells, are invaded in vivo in each organ. Moreover, a mutant defective for the T3SS-1, Rck and PagN remained able to colonize organs like the wild-type strain and invaded non-phagocytic cells in each organ studied. As the infection of the gall bladder had not previously been described in chicks, invasion of gall bladder cells was confirmed by immunohistochemistry and infection was shown to last several weeks after inoculation. Altogether, for the first time these findings provide insights into cell tropism of Salmonella in relevant organs involved in Salmonella infection in chicks and also demonstrate that the known invasion factors are not required for entry into these cell types.
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Affiliation(s)
- S. M. Roche
- INRAE, Université de Tours, ISP, 37380 Nouzilly, France
| | - S. Holbert
- INRAE, Université de Tours, ISP, 37380 Nouzilly, France
| | - Y. Le Vern
- INRAE, Université de Tours, ISP, 37380 Nouzilly, France
| | - C. Rossignol
- INRAE, Université de Tours, ISP, 37380 Nouzilly, France
| | - A. Rossignol
- INRAE, Université de Tours, ISP, 37380 Nouzilly, France
| | - P. Velge
- INRAE, Université de Tours, ISP, 37380 Nouzilly, France
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2
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Borowczyk C, Laroche-Traineau J, Grevelinger J, Rossignol A, Jacobin-Valat MJ, Clofent-Sanchez G, Ottones F. The specific optical properties of foamy macrophages may be due to their specific metabolism AND/OR lipid handling. Atherosclerosis 2021. [DOI: 10.1016/j.atherosclerosis.2021.06.325] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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3
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Lebrun C, Gély-Nargeot MC, Rossignol A, Geny C, Bayard S. Effectiveness Of Cognitive Behavioral Therapy For Insomnia Comorbid To Parkinson's Disease: A Focus On Psychological And Daytime Functioning. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.599] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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4
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Estupina P, Fontayne A, Barret JM, Kersual N, Dubreuil O, Le Blay M, Pichard A, Jarlier M, Pugnière M, Chauvin M, Chardès T, Pouget JP, Deshayes E, Rossignol A, Abache T, de Romeuf C, Terrier A, Verhaeghe L, Gaucher C, Prost JF, Pèlegrin A, Navarro-Teulon I. The anti-tumor efficacy of 3C23K, a glyco-engineered humanized anti-MISRII antibody, in an ovarian cancer model is mainly mediated by engagement of immune effector cells. Oncotarget 2018; 8:37061-37079. [PMID: 28427157 PMCID: PMC5513714 DOI: 10.18632/oncotarget.15715] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 11/15/2016] [Accepted: 02/11/2017] [Indexed: 01/06/2023] Open
Abstract
Ovarian cancer is the leading cause of death in women with gynecological cancers and despite recent advances, new and more efficient therapies are crucially needed. Müllerian Inhibiting Substance type II Receptor (MISRII, also named AMHRII) is expressed in most ovarian cancer subtypes and is a novel potential target for ovarian cancer immunotherapy. We previously developed and tested 12G4, the first murine monoclonal antibody (MAb) against human MISRII. Here, we report the humanization, affinity maturation and glyco-engineering steps of 12G4 to generate the Fc-optimized 3C23K MAb, and the evaluation of its in vivo anti-tumor activity. The epitopes of 3C23K and 12G4 were strictly identical and 3C23K affinity for MISRII was enhanced by a factor of about 14 (KD = 5.5 × 10−11 M vs 7.9 × 10−10 M), while the use of the EMABling® platform allowed the production of a low-fucosylated 3C23K antibody with a 30-fold KD improvement of its affinity to FcγRIIIa. In COV434-MISRII tumor-bearing mice, 3C23K reduced tumor growth more efficiently than 12G4 and its combination with carboplatin was more efficient than each monotherapy with a mean tumor size of 500, 1100 and 100 mm3 at the end of treatment with 3C23K (10 mg/kg, Q3-4D12), carboplatin (60 mg/kg, Q7D4) and 3C23K+carboplatin, respectively. Conversely, 3C23K-FcKO, a 3C23K form without affinity for the FcγRIIIa receptor, did not display any anti-tumor effect in vivo. These results strongly suggested that 3C23K mechanisms of action are mainly Fc-related. In vitro, antibody-dependent cytotoxicity (ADCC) and antibody-dependent cell phagocytosis (ADCP) were induced by 3C23K, as demonstrated with human effector cells. Using human NK cells, 50% of the maximal lysis was obtained with a 46-fold lower concentration of low-fucosylated 3C23K (2.9 ng/ml) than of 3C23K expressed in CHO cells (133.35 ng/ml). As 3C23K induced strong ADCC with human PBMC but almost none with murine PBMC, antibody-dependent cell phagocytosis (ADCP) was then investigated. 3C23K-dependent (100 ng/ml) ADCP was more active with murine than human macrophages (only 10% of living target cells vs. about 25%). These in vitro results suggest that the reduced ADCC with murine effectors could be partially balanced by ADCP activity in in vivo experiments. Taken together, these preclinical data indicate that 3C23K is a new promising therapeutic candidate for ovarian cancer immunotherapy and justify its recent introduction in a phase I clinical trial.
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Affiliation(s)
- Pauline Estupina
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | | | | | - Nathalie Kersual
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | | | - Marion Le Blay
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | - Alexandre Pichard
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | - Marta Jarlier
- Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | - Martine Pugnière
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | - Maëva Chauvin
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | - Thierry Chardès
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | - Jean-Pierre Pouget
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | - Emmanuel Deshayes
- Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | | | | | | | | | | | | | | | - André Pèlegrin
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
| | - Isabelle Navarro-Teulon
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France.,INSERM, U896, Montpellier, F-34298, France.,Université Montpellier, Montpellier, F-34298, France.,Institut Régional du Cancer de Montpellier, ICM, Montpellier, F-34298, France
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5
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Rossignol A, Bonnaudet V, Clémenceau B, Vié H, Bretaudeau L. A high-performance, non-radioactive potency assay for measuring cytotoxicity: A full substitute of the chromium-release assay targeting the regulatory-compliance objective. MAbs 2017; 9:521-535. [PMID: 28281922 DOI: 10.1080/19420862.2017.1286435] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Standardized and biologically relevant potency assays are required by the regulatory authorities for the characterization and quality control of therapeutic antibodies. As critical mechanisms of action (MoA) of antibodies, the antibody-dependent cell-meditated cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC) must be characterized by appropriate potency assays. The current reference method for measuring cytotoxicity is the 51Cr-release method. However, radioactivity handling is difficult to implement in an industrial context because of environmental and operator protection constraints. Alternative non-radioactive methods suffer from poor validation performances and surrogate assays that measure FcγR-dependent functions do not comply with the regulatory requirement of biological relevance. Starting from these observations, we developed a non-radioactive luminescent method that is specific for target cell cytolysis. In adherent and non-adherent target cell models, the ADCC (using standardized effector cells) or CDC activities of rituximab, trastuzumab and adalimumab were compared in parallel using the 51Cr or luminescent methods. We demonstrated that the latter method is highly sensitive, with validation performances similar or better than the 51Cr method. This method also detected apoptosis following induction by a chemical agent or exposure to ultraviolet light. Moreover, it is more accurate, precise and specific than the concurrent non-radioactive calcein- and TR-FRET-based methods. The method is easy to use, versatile, standardized, biologically relevant and cost effective for measuring cytotoxicity. It is an ideal candidate for developing regulatory-compliant cytotoxicity assays for the characterization of the ADCC, CDC or apoptosis activities from the early stages of development to lot release.
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Affiliation(s)
| | | | - Béatrice Clémenceau
- b Centre Hospitalier Universitaire de Nantes , Nantes cedex 01 , France.,c UMR INSERM U892 , Nantes Cedex , France
| | - Henri Vié
- c UMR INSERM U892 , Nantes Cedex , France
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6
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Bayard S, Joly E, Ghisletta P, Rossignol A, Herades Y, Geny C, Gély-Nargeot MC, Rochat L. A multidimensional approach to impulsivity in Parkinson's disease: measurement and structural invariance of the UPPS Impulsive Behaviour Scale. Psychol Med 2016; 46:2931-2941. [PMID: 27460484 DOI: 10.1017/s0033291716001586] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Poor impulse control is a common feature in patients with Parkinson's disease (PD). However, before testing whether patients with PD and controls differ in impulsivity, one must assess whether impulsivity measures are invariant across groups. Consequently, we examined (a) the measurement and structural invariance of a scale assessing changes in four dimensions of impulsivity (urgency, lack of premeditation, lack of perseverance and sensation seeking) among patients with PD and controls; and (b) whether the four impulsivity traits relate differentially to risky decisions by patients. METHOD Close relatives of 78 patients with idiopathic PD and 96 control participants were given the short Urgency-Premeditation-Perseverance-Sensation seeking Impulsive Behaviour Scale (UPPS), which assesses changes in four dimensions of impulsivity. Participants also completed the Game of Dice Task (GDT), a laboratory measure of risk taking. RESULTS Multigroup confirmatory factor analyses supported measurement invariance across groups, whereas structural invariance was not confirmed. Patients with PD showed greater variability and higher impulsivity than controls. Furthermore, patients with impulse control disorders (ICDs) demonstrated even greater levels of sensation seeking than patients without ICDs. Finally, lower premeditation and greater perseverance were significantly associated with greater risk taking in patients with PD, and higher agonist dopaminergic doses with less risky choices on the GDT. CONCLUSIONS The questionnaire appears to function comparably across patients and controls. Thus, group comparisons on the questionnaire can be considered valid. Mean differences between groups on the dimensions of impulsivity may reflect executive impairments and/or abnormal reward processing in patients with PD, which may lead to risky behaviours.
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Affiliation(s)
- S Bayard
- Laboratoire Epsylon,EA 4556,Universités Paul Valéry,Montpellier,France
| | - E Joly
- Methodology and Data Analysis Unit,University of Geneva,Geneva,Switzerland
| | - P Ghisletta
- Methodology and Data Analysis Unit,University of Geneva,Geneva,Switzerland
| | - A Rossignol
- Service de Neurologie,Hôpital Gui de Chauliac,Montpellier,France
| | - Y Herades
- Consultation mémoire,CH Val d'Ariège,Foix,France
| | - C Geny
- Service de Neurologie,Hôpital Gui de Chauliac,Montpellier,France
| | - M-C Gély-Nargeot
- Laboratoire Epsylon,EA 4556,Universités Paul Valéry,Montpellier,France
| | - L Rochat
- Cognitive Psychopathology and Neuropsychology Unit,University of Geneva,Switzerland
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7
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Rossignol A, Levescot A, Jacomet F, Robin A, Basbous S, Giraud C, Roy L, Guilhot F, Turhan AG, Barra A, Herbelin A, Gombert JM. Evidence for BCR-ABL-dependent dysfunctions of iNKT cells from chronic myeloid leukemia patients. Eur J Immunol 2012; 42:1870-5. [PMID: 22585600 DOI: 10.1002/eji.201142043] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Chronic myeloid leukemia (CML) is a clonal hematopoietic stem-cell malignancy characterized by the presence of the chimeric BCR-ABL oncoprotein with deregulated tyrosine-kinase (TK) activity. Although conventional T cells are acknowledged as important players in the control of CML, a possible modification of invariant NKT (iNKT) cells, known for their antitumoral activity, has not been established as yet. Here, we showed that the expression of perforin, CD95L, and promyelocytic leukemia zinc finger, a transcription factor required for maintenance of iNKT cell functions, was reduced or suppressed in CML patients at diagnosis, as compared with healthy individuals. The proliferation rate of blood iNKT cells in response to their cognate ligand was likewise diminished. These functional deficiencies were corrected in patients having achieved complete cytogenetic remission following TK inhibitor or IFN-α therapy. iNKT cells from CML patients in the chronic phase did not display increased TK activity, which argued against a direct autonomous action of BCR-ABL. Instead, we found that their anergic status originated from both intrinsic and APC-dependent dysfunctions. Our data demonstrate that chronic phase CML is associated with functional deficiencies of iNKT cells that are restored upon remission. These results suggest a possible contribution to disease control by TK inhibitor therapies.
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Velge P, Wiedemann A, Rosselin M, Abed N, Boumart Z, Chaussé AM, Grépinet O, Namdari F, Roche SM, Rossignol A, Virlogeux-Payant I. Multiplicity of Salmonella entry mechanisms, a new paradigm for Salmonella pathogenesis. Microbiologyopen 2012; 1:243-58. [PMID: 23170225 PMCID: PMC3496970 DOI: 10.1002/mbo3.28] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [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: 02/20/2012] [Revised: 05/04/2012] [Accepted: 05/07/2012] [Indexed: 01/27/2023] Open
Abstract
The Salmonella enterica species includes about 2600 diverse serotypes, most of which cause a wide range of food- and water-borne diseases ranging from self-limiting gastroenteritis to typhoid fever in both humans and animals. Moreover, some serotypes are restricted to a few animal species, whereas other serotypes are able to infect plants as well as cold- and warm-blooded animals. An essential feature of the pathogenicity of Salmonella is its capacity to cross a number of barriers requiring invasion of a large variety of phagocytic and nonphagocytic cells. The aim of this review is to describe the different entry pathways used by Salmonella serotypes to enter different nonphagocytic cell types. Until recently, it was accepted that Salmonella invasion of eukaryotic cells required only the type III secretion system (T3SS) encoded by the Salmonella pathogenicity island-1. However, recent evidence shows that Salmonella can cause infection in a T3SS-1-independent manner. Currently, two outer membrane proteins Rck and PagN have been clearly identified as Salmonella invasins. As Rck mediates a Zipper-like entry mechanism, Salmonella is therefore the first bacterium shown to be able to induce both Zipper and Trigger mechanisms to invade host cells. In addition to these known entry pathways, recent data have shown that unknown entry routes could be used according to the serotype, the host and the cell type considered, inducing either Zipper-like or Trigger-like entry processes. The new paradigm presented here should change our classic view of Salmonella pathogenicity. It could also modify our understanding of the mechanisms leading to the different Salmonella-induced diseases and to Salmonella-host specificity.
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Affiliation(s)
- P Velge
- INRA, UMR1282 Infectiologie et Santé Publique F-37380, Nouzilly, France ; Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique F-37000, Tours, France
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Levescot A, Rossignol A, Jacomet F, Robin A, Basbous S, Giraud C, Roy L, Guilhot F, Turhan A, Barra A, Herbelin A, Gombert JM. Evidence for a BCR-ABL-induced anergic state of iNTK cells in chronic myeloid leukemia patients at diagnosis (162.32). The Journal of Immunology 2012. [DOI: 10.4049/jimmunol.188.supp.162.32] [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] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Chronic myeloid leukemia (CML) is a myeloproliferative disorder, caused by the presence of the Philadelphia chromosome and the consecutive chimerical BCR-ABL oncoprotein, with deregulated tyrosine kinase (TK) activity. Whether invariant NKT (iNKT) cells, which are documented for their anti-tumoral activity, are affected during the disease remains unknown. Here, we addressed this issue by showing that proliferation rate of blood iNKT cells in response to their cognate ligand α-galactosylceramide is altered in CML patients at diagnosis, as compared to healthy subjects. This anergic state of iNKT cells was associated with both intrinsic and APC-dependent alterations. Furthermore, expression of perforin and CD95-L as well as that of PLZF, a transcription factor that is requisite for maintenance of functions of iNKT cells, were also decreased in patients at diagnosis. Importantly, all these functional impairments were corrected in patients who achieved a complete cytogenetic remission with the TK inhibitor imatinib mesylate (IM) or IFN-γ therapy. Together, these data demonstrate that chronic phase CML is associated with an acquired but potentially reversible defect in iNKT cells. Given the critical role of iNKT cells in tumor surveillance, it is tempting to propose that iNKT cell dysfunctions associated with CML thus could be one way used by tumors to escape from the anti-CML immune response while IM and IFN-γ exert their anti-leukemic effects in part in targeting iNKT cells.
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Affiliation(s)
- Anais Levescot
- 1University Paris-Sud 11, INSERM UMR S935, Paris, France
| | | | - Florence Jacomet
- 2University of Poitiers, INSERM UMR S935, Poitiers, France
- 3Service Immunologie et Inflammation, CHU de Poitiers, Poitiers, France
| | - Aurélie Robin
- 4University of Poitiers, INSERM UMR S927, Poitiers, France
| | - Sara Basbous
- 2University of Poitiers, INSERM UMR S935, Poitiers, France
| | - Christine Giraud
- 5Etablissement Français du Sang Centre-Atlantique, CHU de Poitiers, Poitiers, France
| | - Lydia Roy
- 6University of Poitiers, Centre d’investigation clinique INSERM 802, Poitiers, France
| | - François Guilhot
- 2University of Poitiers, INSERM UMR S935, Poitiers, France
- 6University of Poitiers, Centre d’investigation clinique INSERM 802, Poitiers, France
| | - Ali Turhan
- 2University of Poitiers, INSERM UMR S935, Poitiers, France
- 7Service d’Oncologie Hématologique et Thérapie Cellulaire, CHU de Poitiers, Poitiers, France
| | - Anne Barra
- 2University of Poitiers, INSERM UMR S935, Poitiers, France
- 3Service Immunologie et Inflammation, CHU de Poitiers, Poitiers, France
| | | | - Jean-Marc Gombert
- 2University of Poitiers, INSERM UMR S935, Poitiers, France
- 3Service Immunologie et Inflammation, CHU de Poitiers, Poitiers, France
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Gladine C, Meunier N, Blot A, Bruchet L, Pagès X, Gaud M, Floter E, Metin Z, Rossignol A, Cano N, Chardigny J. Preservation of micronutrients during rapeseed oil refining: A tool to optimize the health value of edible vegetable oils? Rationale and design of the Optim'Oils randomized clinical trial. Contemp Clin Trials 2011; 32:233-9. [DOI: 10.1016/j.cct.2010.11.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Revised: 11/02/2010] [Accepted: 11/04/2010] [Indexed: 11/16/2022]
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Gicquel JJ, Navarre R, Langman ME, Coulon A, Balayre S, Milin S, Mercie M, Rossignol A, Barra A, Levillain PM, Gombert JM, Dighiero P. The use of impression cytology in the follow-up of severe ocular burns. Br J Ophthalmol 2007; 91:1160-4. [PMID: 17470529 PMCID: PMC1954918 DOI: 10.1136/bjo.2007.114447] [Citation(s) in RCA: 9] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AIMS To evaluate by impression cytology (IC) the expression of the MHC class II inflammatory marker HLA-DR by the conjunctival epithelium, the cytological modifications of the conjunctival surface according to the Nelson's classification, and the eventual correlation between the two after severe ocular burns. METHODS A total of 24 patients (24 eyes) who presented with severe ocular burns underwent IC. We compared them with 18 healthy eyes. HLA-DR expression was studied by flow cytometry as well as the conjunctival histology evaluated with the Nelson's classification from 2-24 months after the onset of burns. RESULTS There was a significant upregulation of the expression of HLA-DR in eyes with burns compared to the healthy population at 2 months (p<0.001), 6 months (p<0.001), 12 months (p = 0.019), 18 months (p = 0.0171) and 24 months (p = 0.01766). A significant difference was found between the Nelson grade in the pathological population and those of the healthy population at 2 months (p = 0.0157). HLA-DR upregulation was significantly correlated with the Nelson's grades between 2 months (r = 0.69, p<0.0001) and 6 months (r = 0.61, p = 0.0001). CONCLUSION The IC technique can act as a useful tool for following-up ocular surface inflammation after severe ocular burns.
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12
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Rossignol A, Barra A, Herbelin A, Preud'homme JL, Gombert JM. Freshly isolated Valpha24+ CD4+ invariant natural killer T cells activated by alpha-galactosylceramide-pulsed B cells promote both IgG and IgE production. Clin Exp Immunol 2007; 148:555-63. [PMID: 17362268 PMCID: PMC1941929 DOI: 10.1111/j.1365-2249.2007.03364.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [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: 11/28/2022] Open
Abstract
CD1d-restricted invariant natural killer T (iNK T) cells activated by their experimental ligand alpha-galactosylceramide (alpha-GC) can produce both T helper 1 (Th1) and Th2 cytokines and display regulatory functions. Recent studies identified CD4(+) and CD4(-) CD8(-) double-negative (DN) iNK T cells as the two major components of the human population and suggest that they display a Th2 and a Th1 profile, respectively. We compared the Th2-promoting activity of freshly isolated human CD4(+) and DN iNK T cells in terms of their capacity to induce Ig production by autologous B cells. Secretion of IgG and IgE but not IgM was enhanced by the CD4(+) T cell subset (including iNK T cells) but not by its DN counterpart. iNK T cells were directly responsible for this pro-Th2 effect, as demonstrated by the requirement for both alpha-GC stimulation and CD1d presentation, as well as by its disappearance upon iNK T cell depletion. Interaction with iNK T cells led to progressive accumulation of isotype-switched and activated B cells. Myeloid dendritic cells (DC) completely block the induction of Ig production in co-culture. This dominant inhibitory effect of myeloid DC was concomitant with a specific loss of interleukin (IL)-4 production by CD4(+) iNK T but not by conventional T cells. These data support the conclusion that, conversely to the interferon (IFN)-gamma-producing DN human iNK T cell population, interleukin (IL)-4-producing CD4(+) iNK T cells can activate and help B cells to produce both IgG and IgE through a CD1d-dependent mechanism, in keeping with a functional Th1/Th2 dichotomy between these subsets.
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Affiliation(s)
- A Rossignol
- Laboratoire d'Immunologie-Immunopathologie, Centre Hospitalier Universitaire La Milétrie, Pôle Biologie Santé Poitiers, France
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Adams W, Davis T, Rossignol A, Silverman G, Simmons T, Smith G, Stern B. Undergraduate environmental health education: preparing for the future. J Environ Health 2001; 63:27-31. [PMID: 11381469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Attendees indicated that the workshop was beneficial and that the opportunity to communicate with faculty representing 23 programs accredited by EHAC and nine programs not accredited by EHAC was extremely useful. There was general agreement on a number of points: There is a need for undergraduate environmental health programs to collaborate on matters related to distance learning. Topics related to women, gender, diversity, ethics, and international environmental health should be incorporated into the environmental health curriculum. There are no major problems with current EHAC curricular guidelines, but the guidelines should be evaluated on a regular basis. Field experience or internship is an essential component in the academic preparation of undergraduate environmental health students. There is a significant need for increased funding for undergraduate environmental health programs. There is a need to increase the visibility and recognition of environmental health programs. There is a need to solidify ties with traditional partners and to establish new linkages at the local, regional, and national levels in the government, community, and private sector. It is essential that undergraduate faculty communicate with each other on matters relating to the preparation of environment health practitioners. There is a need for an association of undergraduate academic programs to provide leadership and a focal point for identification and resolution of issues common to all. The establishment of an association was viewed as the most practical and effective way to address these issues and to pursue related opportunities.
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Abstract
Fatty acid composition of lipid classes and NMR spectra of lipoproteins were compared in 6 young (24-35-year-old) and 6 elderly (79-90-year-old) women. Cholesteryl ester, triglyceride and protein content of LDL in elderly women were significantly higher (+52-57% and +20% for lipids and proteins, respectively) than those observed in young women. HDL lipid levels were similar in the two groups. The proportion of linoleic acid (mainly in cholesteryl esters and phospholipids) of each lipoprotein species was always lower in octogenarians when compared with young females (lowering of 13-28% and 27-46% for cholesteryl esters and phospholipids, respectively). Conversely, the proportions of mono-unsaturated fatty acids (mainly oleic acid) increased in all lipid classes, although this was only significant in cholesteryl esters from each lipoprotein species. NMR spectra of lipoproteins showed a restricted mobility of acyl chain terminal CH3 groups in old women which was significant only in VLDL and HDL3. This suggests that the decrease of linoleic acid could affect the lipid mobility in lipoproteins of elderly women.
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Affiliation(s)
- J Lecerf
- U 352 INSERM, Chimie Biologique, INSA, Villeurbanne, France
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Nabholtz JM, Rossignol A, Farnier M, Gambert P, Tremeaux JC, Friedman S, Guerrin J. Proton nuclear magnetic resonance spectroscopy of plasma lipoproteins in malignancy. Acta Oncol 1988; 27:479-82. [PMID: 3203006 DOI: 10.3109/02841868809093574] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 01/04/2023]
Abstract
A recent study (N. Eng. J. Med. 315 (1986), 1369), described a method of detecting malignant tumors by water-suppressed proton nuclear magnetic resonance (1 H NMR) study of plasma. We performed a similar study of the W 1/2, a mean of the full width at half height of the resonances of the methyl and methylene groups of the lipids of plasma lipoproteins which is inversely related to the spin-spin apparent relaxation time (T 2*). W 1/2 values were measured at a fixed baseline width of 310 Hz. The study was prospective and blinded and comprised 182 subjects consisting of 40 controls, 68 patients with untreated malignancies, 45 with malignant tumors undergoing therapy and 29 benign tumor patients. No differences were seen between any groups that could serve as a basis for a useful clinical test. The major difficulty in the determination of W 1/2 was due to interference of metabolite protons (particularly lactate) within the lipoprotein resonance signal. Triglyceride level was seen to correlate inversely with W 1/2 within malignant patient groups. These discrepant results may be related to differing triglyceride-rich very low density lipoprotein (VLDL) levels in the patient populations of each study. We conclude that the water-suppressed 1H NMR of plasma lipoproteins is not a valid measurement for assessing malignancy.
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Affiliation(s)
- J M Nabholtz
- Centre Georges-François Leclerc, UA33 CNRS, Faculte des Sciences, Hospital du Bocage, Villejuif, France
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Couderc JL, Renard P, Larroque I, Rossignol A. [Air bulla or sodium hyaluronate (Healonid) for the protection of the corneal endothelium. Comparative study apropos of 30 Simcoe implants in the posterior chamber]. Bull Soc Ophtalmol Fr 1982; 82:775-8. [PMID: 7172371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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