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Todd N Eagar - One of the best experts on this subject based on the ideXlab platform.
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cd11c cd88 cd317 myeloid cells are critical mediators of persistent cns autoimmunity
Proceedings of the National Academy of Sciences of the United States of America, 2021Co-Authors: Navid Manouchehri, Rehana Z Hussain, Petra D Cravens, Brian T Edelson, Anne H Cross, Richard Doelger, Nicolas Loof, Ekaterina Esaulova, Maxim N Artyomov, Todd N EagarAbstract:Natalizumab, a humanized monoclonal antibody (mAb) against α4-integrin, reduces the number of dendritic cells (DC) in cerebral perivascular spaces in multiple sclerosis (MS). Selective deletion of α4-integrin in CD11c+ cells should curtail their migration to the central nervous system (CNS) and ameliorate experimental autoimmune encephalomyelitis (EAE). We generated CD11c.Cre+/- ITGA4 fl/fl C57BL/6 mice to selectively delete α4-integrin in CD11c+ cells. Active immunization and adoptive transfer EAE models were employed and compared with WT controls. Multiparameter flow cytometry was utilized to immunophenotype leukocyte subsets. Single-cell RNA sequencing was used to profile individual cells. α4-Integrin expression by CD11c+ cells was significantly reduced in primary and secondary lymphoid organs in CD11c.Cre+/- ITGA4 fl/fl mice. In active EAE, a delayed disease onset was observed in CD11c.Cre+/- ITGA4 fl/fl mice, during which CD11c+CD88+ cells were sequestered in the blood. Upon clinical EAE onset, CD11c+CD88+ cells appeared in the CNS and expressed CD317+ In adoptive transfer experiments, CD11c.Cre+/- ITGA4 fl/fl mice had ameliorated clinical disease phenotype associated with significantly diminished numbers of CNS CD11c+CD88+CD317+ cells. In human cerebrospinal fluid from subjects with neuroinflammation, microglia-like cells display coincident expression of ITGAX (CD11c), C5AR1 (CD88), and BST2 (CD317). In mice, we show that only activated, but not naive microglia expressed CD11c, CD88, and CD317. Finally, anti-CD317 treatment prior to clinical EAE substantially enhanced recovery in mice.
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cd11c cd88 cd317 myeloid cells are critical mediators of persistent cns autoimmunity
bioRxiv, 2020Co-Authors: Navid Manouchehri, Rehana Z Hussain, Petra D Cravens, Brian T Edelson, Anne H Cross, Richard Doelger, Nicolas Loof, Todd N Eagar, Thomas G Forsthuber, Laurent CalvierAbstract:Abstract Background Natalizumab, a humanized monoclonal antibody (mAb) against α4-integrin, reduces the number of dendritic cells (DC) in cerebral perivascular spaces in multiple sclerosis (MS). Selective deletion of α4-integrin in CD11c+ cells should curtail their migration to the CNS and ameliorate experimental autoimmune encephalomyelitis (EAE). Methods We generated CD11c.Cre+/-ITGA4fl/fl C57/Bl6 mice to selectively delete α4-integrin in CD11c+ cells. Active immunization and adoptive transfer EAE models were employed. Multi-parameter flow cytometry was utilized to immunophenotype leukocytes. Single-cell RNA sequencing (scRNA-seq) was used to profile individual cells. Results α4-integrin expression by CD11c+ cells was significantly reduced in primary and secondary lymphoid organs in CD11c.Cre+/-ITGA4fl/fl mice. In active EAE, a delayed disease onset was observed in CD11c.Cre+/-ITGA4fl/fl mice, during which CD11c+CD88+ cells were sequestered in the blood. Upon EAE onset, CD11c+CD88+ cells accumulated in the CNS and expressed CD317+. In adoptive transfer experiments, CD11c.Cre+/-ITGA4fl/fl mice had ameliorated clinical disease associated with diminished numbers of CNS CD11c+CD88+CD317+ cells. The transcription profile of CD11c+CD88+CD317+ cells placed them within previously defined microglia-like cells in human CSF. We show that activated, but not naive microglia expressed CD11c, CD88, and CD317. Finally, anti-CD317 treatment prior to clinical EAE substantially enhanced recovery. Conclusion CD11c+CD88+CD317+ cells in the CNS promote inflammatory damage. Transcriptional analysis identifies CD11c+CD88+CD317+ cells as a unique myeloid subset in human CSF. The disease-propagating effects of these cells can be antagonized using anti-CD317 mAb.
Richard I. Christopherson - One of the best experts on this subject based on the ideXlab platform.
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All-trans retinoic acid induces different immunophenotypic changes on human HL60 and NB4 myeloid leukaemias
Leukemia research, 2007Co-Authors: Nicole Barber, Larissa Belov, Richard I. ChristophersonAbstract:Abstract All- trans retinoic acid (ATRA) is used to treat patients with acute promyelocytic leukaemia (APL), inducing APL cells to differentiate into abnormal neutrophils. To investigate the possible relationship between the chromosome translocation t (15;17) found in APL and ATRA treatment, the human myeloid leukaemia cell lines HL60 and NB4, that are PML-RARα negative and positive, respectively, were treated with ATRA and immunophenotyped using a CD antibody microarray. For HL60 cells, ATRA induced major increases in descending order of CD38, CD11b, CD45RO, CD11c, CD54 and CD36 with repression of CD117 and CD44. For NB4 cells, ATRA induced major increases in descending order of CD11c, CD54, CD11a, CD11b, CD53, CD65, CD138, CD66c and T-cell receptor α/β (TCRα/β), with repression of CD38 and CD9. The induction of a number of these CD antigens is consistent with the known differentiation of these leukaemias to abnormal neutrophils. Approximately half of the antigens up-regulated by ATRA on NB4 cells were adhesion molecules, including CD11a, CD11b, CD11c, CD54, CD66c and CD138, consistent with the increased adhesiveness of leukaemia cells observed for APL patients treated with ATRA. On HL60 cells, ATRA induced expression of CD38, CD43 and CD45RO and repressed CD117, while the converse was true on NB4 cells that contain chimeric PML-RARα. For NB4 cells, ATRA induced some remarkable increases in CD antigens not seen for HL60: CD14 (16.6-fold), CD32 (27.8), CD53 (20.5), CD65 (139), CD66c (79.7), CD126 (15.1), and CD138 (57.6). The expression of these antigens may be regulated by PML-RARα in the presence of ATRA. Such CD antigens could be targets for synergistic treatment of APL with therapeutic antibodies following ATRA treatment.
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immunophenotypic changes induced on human hl60 leukaemia cells by 1α 25 dihydroxyvitamin d3 and 12 o tetradecanoyl phorbol 13 acetate
Leukemia Research, 2005Co-Authors: Sarah L White, Nicole Barber, Larissa Belov, Philip D Hodgkin, Richard I. ChristophersonAbstract:1alpha,25-Dihydroxyvitamin D3 (1,25D3) induces HL60 cells to acquire a monocyte-like phenotype, while cells treated with 12-O-tetradecanoyl phorbol-13-acetate (TPA) resemble macrophages. Using a microarray of 82 CD antibodies, 24 cluster of differentiation (CD) antigens were detected on HL60 cells. 1,25D3 induced the following antigens in decreasing order of the change: CD14, CD11c, CD11b, CD54, CD86, CD38 and CD66c, with repression of CD117, CD71, CD95, CD45 and CD64. TPA induced the following antigens in decreasing order of the change: CD11c, CD9, CD11b, CD54, CD38, CD45RO and CD66c, with repression of CD4, CD117, CD95, CD71 and CD64. The results presented provide a basis for monitoring differentiation therapy of myeloid leukaemias in patients.
Navid Manouchehri - One of the best experts on this subject based on the ideXlab platform.
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cd11c cd88 cd317 myeloid cells are critical mediators of persistent cns autoimmunity
Proceedings of the National Academy of Sciences of the United States of America, 2021Co-Authors: Navid Manouchehri, Rehana Z Hussain, Petra D Cravens, Brian T Edelson, Anne H Cross, Richard Doelger, Nicolas Loof, Ekaterina Esaulova, Maxim N Artyomov, Todd N EagarAbstract:Natalizumab, a humanized monoclonal antibody (mAb) against α4-integrin, reduces the number of dendritic cells (DC) in cerebral perivascular spaces in multiple sclerosis (MS). Selective deletion of α4-integrin in CD11c+ cells should curtail their migration to the central nervous system (CNS) and ameliorate experimental autoimmune encephalomyelitis (EAE). We generated CD11c.Cre+/- ITGA4 fl/fl C57BL/6 mice to selectively delete α4-integrin in CD11c+ cells. Active immunization and adoptive transfer EAE models were employed and compared with WT controls. Multiparameter flow cytometry was utilized to immunophenotype leukocyte subsets. Single-cell RNA sequencing was used to profile individual cells. α4-Integrin expression by CD11c+ cells was significantly reduced in primary and secondary lymphoid organs in CD11c.Cre+/- ITGA4 fl/fl mice. In active EAE, a delayed disease onset was observed in CD11c.Cre+/- ITGA4 fl/fl mice, during which CD11c+CD88+ cells were sequestered in the blood. Upon clinical EAE onset, CD11c+CD88+ cells appeared in the CNS and expressed CD317+ In adoptive transfer experiments, CD11c.Cre+/- ITGA4 fl/fl mice had ameliorated clinical disease phenotype associated with significantly diminished numbers of CNS CD11c+CD88+CD317+ cells. In human cerebrospinal fluid from subjects with neuroinflammation, microglia-like cells display coincident expression of ITGAX (CD11c), C5AR1 (CD88), and BST2 (CD317). In mice, we show that only activated, but not naive microglia expressed CD11c, CD88, and CD317. Finally, anti-CD317 treatment prior to clinical EAE substantially enhanced recovery in mice.
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cd11c cd88 cd317 myeloid cells are critical mediators of persistent cns autoimmunity
bioRxiv, 2020Co-Authors: Navid Manouchehri, Rehana Z Hussain, Petra D Cravens, Brian T Edelson, Anne H Cross, Richard Doelger, Nicolas Loof, Todd N Eagar, Thomas G Forsthuber, Laurent CalvierAbstract:Abstract Background Natalizumab, a humanized monoclonal antibody (mAb) against α4-integrin, reduces the number of dendritic cells (DC) in cerebral perivascular spaces in multiple sclerosis (MS). Selective deletion of α4-integrin in CD11c+ cells should curtail their migration to the CNS and ameliorate experimental autoimmune encephalomyelitis (EAE). Methods We generated CD11c.Cre+/-ITGA4fl/fl C57/Bl6 mice to selectively delete α4-integrin in CD11c+ cells. Active immunization and adoptive transfer EAE models were employed. Multi-parameter flow cytometry was utilized to immunophenotype leukocytes. Single-cell RNA sequencing (scRNA-seq) was used to profile individual cells. Results α4-integrin expression by CD11c+ cells was significantly reduced in primary and secondary lymphoid organs in CD11c.Cre+/-ITGA4fl/fl mice. In active EAE, a delayed disease onset was observed in CD11c.Cre+/-ITGA4fl/fl mice, during which CD11c+CD88+ cells were sequestered in the blood. Upon EAE onset, CD11c+CD88+ cells accumulated in the CNS and expressed CD317+. In adoptive transfer experiments, CD11c.Cre+/-ITGA4fl/fl mice had ameliorated clinical disease associated with diminished numbers of CNS CD11c+CD88+CD317+ cells. The transcription profile of CD11c+CD88+CD317+ cells placed them within previously defined microglia-like cells in human CSF. We show that activated, but not naive microglia expressed CD11c, CD88, and CD317. Finally, anti-CD317 treatment prior to clinical EAE substantially enhanced recovery. Conclusion CD11c+CD88+CD317+ cells in the CNS promote inflammatory damage. Transcriptional analysis identifies CD11c+CD88+CD317+ cells as a unique myeloid subset in human CSF. The disease-propagating effects of these cells can be antagonized using anti-CD317 mAb.
Angel L. Corbí - One of the best experts on this subject based on the ideXlab platform.
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identification of sp1 binding sites in the cd11c p150 95α and cd11a lfa 1α integrin subunit promoters and their involvement in the tissuespecific expression of cd11c
European Journal of Immunology, 1995Co-Authors: Cristina Lopezrodriguez, Huimin Chen, Daniel G Tenen, Angel L. CorbíAbstract:The leukocyte integrins LFA-1 (CD11a/CD18) and p150,95 (CD11c/CD18) mediate cell-cell and cell-extracellular matrix interactions during inflammatory responses and signal transduction into the cytoplasm. While the CD11a integrin subunit is expressed on all leukocytes, CD11c is almost exclusively expressed on cells of the myeloid lineage and on activated B lymphocytes. Its expression is regulated during cell activation and differentiation by transcriptional mechanisms. We have previously demonstrated that the proximal region of the CD11c promoter directs tissue-restricted and developmentally-regulated expression of reporter genes. Structural studies by electrophoretic mobility shift assays have demonstrated the presence of two Sp1-binding sites at -70 (Sp1-70) and -120 (Sp1-120) which mediate the Sp1 transactivation of the CD11c promoter in Sp1-defective SL2 cells, and which are involved in cell lineage-specific DNA-protein interactions, as demonstrated by footprinting in vivo. More importantly, mutation of either Sp1 site inhibited the activity of the CD11c promoter both in myeloid U937 cells and the CD11c-expressing B lymphoblastoid JY cell line, while the opposite effect was observed in the CD11c-negative epithelial HeLa cell line, demonstrating the involvement of both Sp1-binding sites in the basal and the tissue-restricted expression of the CD11c integrin subunit gene. Interestingly, the analysis of the CD11a proximal promoter also revealed the existence of an Sp1-binding site at -70, indicating a common role for these cis-acting elements in the transcription of the leukocyte integrin alpha subunit genes. The binding of Sp1 to the regulatory regions of the leukocyte integrin genes raises the possibility that the retinoblastoma susceptibility gene product is implicated in integrin expression through its functional interaction with Sp1, thus establishing a link between integrin-dependent leukocyte adhesiveness and the state of cellular differentiation/proliferation.
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hematopoietic cell type dependent regulation of leukocyte integrin functional activity cd11b and cd11c expression inhibits lfa 1 dependent aggregation of differentiated u937 cells
Cellular Immunology, 1995Co-Authors: Arsenio Nueda, Cristina Lopezrodriguez, Miguel Rubio, M Sotillos, Antonio Postigo, M A Del Pozo, Miguel A Vega, Angel L. CorbíAbstract:To study the influence of the cellular environment on the functional activity of leukocyte integrins and to analyze their involvement in hematopoietic cell differentiation, we have developed stable transfectants of LFA-1, Mac-1, and p150,95 (CD11a-c/CD18) leukocyte integrins in cultured cell lines whose differentiation can be induced in vitro. As on circulating leukocytes, the integrins expressed on U937 or K562 cells were expressed in a constitutively inactive state, as demonstrated by the lack of adhesion to their cellular counterreceptors or soluble ligands, the absence of CD18-dependent intercellular aggregation, and their inability to mediate adhesion to protein-coated plates. However, while leukocyte integrin adhesive functions in U937 cells were induced upon treatment with cellular agonists (e.g., PMA), their function in K562 cells could be upregulated only with activating monoclonal antibodies, demonstrating the cell-type-specific regulation of the adhesive capabilities of the three leukocyte integrins in hematopoietic cellular environment. On the other hand, the expression of either CD11b/CD18 or CD11c/CD18 in U937 myeloid cells before induction of differentiation greatly affected the adhesive phenotype of differentiating cells by abrogating the CD11a/CD18-CD54-dependent homotypic aggregation. Unlike that of mock-transfected U937 cells, differentiation of CD11b/CD18- or CD11c/CD18-transfected U937 cells led to cell adhesion and spreading on the tissue culture plates, with an almost total absence of homotypic aggregates. These results confirm the role of CD11b/CD18 and CD11c/CD18 in myeloid cell adhesion and spreading and suggest that the CD11b/- and CD11c/CD18-mediated recognition of substrate-bound ligands competes or interferes with LFA-1-dependent intercellular adhesion.
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CD23 Regulates monocyte activation through a novel interaction with the adhesion molecules CD11b-CD18 and CD11c-CD18
Immunity, 1995Co-Authors: Sybille Lecoanet-henchoz, Angel L. Corbí, Jean-françois Gauchat, Jean-pierre Aubry, Pierre Graber, Paul Life, Nathalie Paul-eugène, Bernard Ferrua, B. Dugas, Christine Plater-zyberkAbstract:Abstract CD23 is expressed on a variety of haemopoietic cells and displays pleiotropic activities in vitro. We report that in addition to CD21 and IgE, CD23 interacts specifically with the CD11b and CD11c, the α chains of the β2 integrin adhesion molecule complexes CD11b-CD18 and CD11c-C1318, on monocytes. Full-length recombinant CD23 incorporated into fluorescent liposomes was shown to bind to COS cells transfected with cDNA encoding either CD11b-CD18 or CD11c-CD18 but not with CD11a-CD18. The Interaction was specifically inhibited by anti-CD11b or anti-CD11c, respectively, and by anti-CD23 MAbs. The functional significance of this ligand pairing was demonstrated by triggering CD11b and CD11c on monocytes with either recombinant CD23 or anti-CD11b and anti-CD11c MAbs to cause a marked increase in nitrite-oxidative products and proinflammatory cytokines (IL-1β, IL-6, and TNFα). These CD23-mediated activities were decreased by Fab frogments of MAbs to CD11b, CD11c, and CD23. These results demonstrate that CD11b and CD11c are receptors for CD23 and that this novel ligand pairing regulates important activities of monocytes.
Petra D Cravens - One of the best experts on this subject based on the ideXlab platform.
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cd11c cd88 cd317 myeloid cells are critical mediators of persistent cns autoimmunity
Proceedings of the National Academy of Sciences of the United States of America, 2021Co-Authors: Navid Manouchehri, Rehana Z Hussain, Petra D Cravens, Brian T Edelson, Anne H Cross, Richard Doelger, Nicolas Loof, Ekaterina Esaulova, Maxim N Artyomov, Todd N EagarAbstract:Natalizumab, a humanized monoclonal antibody (mAb) against α4-integrin, reduces the number of dendritic cells (DC) in cerebral perivascular spaces in multiple sclerosis (MS). Selective deletion of α4-integrin in CD11c+ cells should curtail their migration to the central nervous system (CNS) and ameliorate experimental autoimmune encephalomyelitis (EAE). We generated CD11c.Cre+/- ITGA4 fl/fl C57BL/6 mice to selectively delete α4-integrin in CD11c+ cells. Active immunization and adoptive transfer EAE models were employed and compared with WT controls. Multiparameter flow cytometry was utilized to immunophenotype leukocyte subsets. Single-cell RNA sequencing was used to profile individual cells. α4-Integrin expression by CD11c+ cells was significantly reduced in primary and secondary lymphoid organs in CD11c.Cre+/- ITGA4 fl/fl mice. In active EAE, a delayed disease onset was observed in CD11c.Cre+/- ITGA4 fl/fl mice, during which CD11c+CD88+ cells were sequestered in the blood. Upon clinical EAE onset, CD11c+CD88+ cells appeared in the CNS and expressed CD317+ In adoptive transfer experiments, CD11c.Cre+/- ITGA4 fl/fl mice had ameliorated clinical disease phenotype associated with significantly diminished numbers of CNS CD11c+CD88+CD317+ cells. In human cerebrospinal fluid from subjects with neuroinflammation, microglia-like cells display coincident expression of ITGAX (CD11c), C5AR1 (CD88), and BST2 (CD317). In mice, we show that only activated, but not naive microglia expressed CD11c, CD88, and CD317. Finally, anti-CD317 treatment prior to clinical EAE substantially enhanced recovery in mice.
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cd11c cd88 cd317 myeloid cells are critical mediators of persistent cns autoimmunity
bioRxiv, 2020Co-Authors: Navid Manouchehri, Rehana Z Hussain, Petra D Cravens, Brian T Edelson, Anne H Cross, Richard Doelger, Nicolas Loof, Todd N Eagar, Thomas G Forsthuber, Laurent CalvierAbstract:Abstract Background Natalizumab, a humanized monoclonal antibody (mAb) against α4-integrin, reduces the number of dendritic cells (DC) in cerebral perivascular spaces in multiple sclerosis (MS). Selective deletion of α4-integrin in CD11c+ cells should curtail their migration to the CNS and ameliorate experimental autoimmune encephalomyelitis (EAE). Methods We generated CD11c.Cre+/-ITGA4fl/fl C57/Bl6 mice to selectively delete α4-integrin in CD11c+ cells. Active immunization and adoptive transfer EAE models were employed. Multi-parameter flow cytometry was utilized to immunophenotype leukocytes. Single-cell RNA sequencing (scRNA-seq) was used to profile individual cells. Results α4-integrin expression by CD11c+ cells was significantly reduced in primary and secondary lymphoid organs in CD11c.Cre+/-ITGA4fl/fl mice. In active EAE, a delayed disease onset was observed in CD11c.Cre+/-ITGA4fl/fl mice, during which CD11c+CD88+ cells were sequestered in the blood. Upon EAE onset, CD11c+CD88+ cells accumulated in the CNS and expressed CD317+. In adoptive transfer experiments, CD11c.Cre+/-ITGA4fl/fl mice had ameliorated clinical disease associated with diminished numbers of CNS CD11c+CD88+CD317+ cells. The transcription profile of CD11c+CD88+CD317+ cells placed them within previously defined microglia-like cells in human CSF. We show that activated, but not naive microglia expressed CD11c, CD88, and CD317. Finally, anti-CD317 treatment prior to clinical EAE substantially enhanced recovery. Conclusion CD11c+CD88+CD317+ cells in the CNS promote inflammatory damage. Transcriptional analysis identifies CD11c+CD88+CD317+ cells as a unique myeloid subset in human CSF. The disease-propagating effects of these cells can be antagonized using anti-CD317 mAb.