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De Biasi S, Gibellini L, Lo Tartaro D, Puccio S, Rabacchi C, Mazza EMC, Brummelman J, Williams B, Kaihara K, Forcato M, Bicciato S, Pinti M, Depenni R, Sabbatini R, Longo C, Dominici M, Pellacani G, Lugli E, Cossarizza A. Circulating mucosal-associated invariant T cells identify patients responding to anti-PD-1 therapy. Nat Commun 2021; 12:1669. [PMID: 33723257 PMCID: PMC7961017 DOI: 10.1038/s41467-021-21928-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [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: 09/28/2020] [Accepted: 02/20/2021] [Indexed: 12/14/2022] Open
Abstract
Immune checkpoint inhibitors are used for treating patients with metastatic melanoma. Since the response to treatment is variable, biomarkers are urgently needed to identify patients who may benefit from such therapy. Here, we combine single-cell RNA-sequencing and multiparameter flow cytometry to assess changes in circulating CD8+ T cells in 28 patients with metastatic melanoma starting anti-PD-1 therapy, followed for 6 months: 17 responded to therapy, whilst 11 did not. Proportions of activated and proliferating CD8+ T cells and of mucosal-associated invariant T (MAIT) cells are significantly higher in responders, prior to and throughout therapy duration. MAIT cells from responders express higher level of CXCR4 and produce more granzyme B. In silico analysis support MAIT presence in the tumor microenvironment. Finally, patients with >1.7% of MAIT among peripheral CD8+ population show a better response to treatment. Our results thus suggest that MAIT cells may be considered a biomarker for patients responding to anti-PD-1 therapy.
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Affiliation(s)
- Sara De Biasi
- Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, Modena, Italy.
| | - Lara Gibellini
- Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, Modena, Italy
| | - Domenico Lo Tartaro
- Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, Modena, Italy
| | - Simone Puccio
- Laboratory of Translational Immunology, IRCCS Humanitas Research Hospital, Milan, Italy
| | - Claudio Rabacchi
- Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, Modena, Italy
| | - Emilia M C Mazza
- Laboratory of Translational Immunology, IRCCS Humanitas Research Hospital, Milan, Italy
| | - Jolanda Brummelman
- Laboratory of Translational Immunology, IRCCS Humanitas Research Hospital, Milan, Italy
| | | | | | - Mattia Forcato
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Silvio Bicciato
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Marcello Pinti
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Roberta Depenni
- Department of Oncology, University of Modena & Reggio Emilia, Modena, Italy
| | - Roberto Sabbatini
- Department of Oncology, University of Modena & Reggio Emilia, Modena, Italy
| | - Caterina Longo
- Department of Surgery, Medicine, Dentistry and Morphological Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Massimo Dominici
- Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, Modena, Italy.,Department of Oncology, University of Modena & Reggio Emilia, Modena, Italy
| | - Giovanni Pellacani
- Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, Modena, Italy
| | - Enrico Lugli
- Laboratory of Translational Immunology, IRCCS Humanitas Research Hospital, Milan, Italy.,Humanitas Flow Cytometry Core, IRCCS Humanitas Research Hospital, Milan, Italy
| | - Andrea Cossarizza
- Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, Modena, Italy.,National Institute for Cardiovascular Research, Bologna, Italy
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2
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Ha CWY, Martin A, Sepich-Poore GD, Shi B, Wang Y, Gouin K, Humphrey G, Sanders K, Ratnayake Y, Chan KSL, Hendrick G, Caldera JR, Arias C, Moskowitz JE, Ho Sui SJ, Yang S, Underhill D, Brady MJ, Knott S, Kaihara K, Steinbaugh MJ, Li H, McGovern DPB, Knight R, Fleshner P, Devkota S. Translocation of Viable Gut Microbiota to Mesenteric Adipose Drives Formation of Creeping Fat in Humans. Cell 2020; 183:666-683.e17. [PMID: 32991841 PMCID: PMC7521382 DOI: 10.1016/j.cell.2020.09.009] [Citation(s) in RCA: 166] [Impact Index Per Article: 41.5] [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: 10/02/2019] [Revised: 07/19/2020] [Accepted: 09/01/2020] [Indexed: 02/08/2023]
Abstract
A mysterious feature of Crohn's disease (CD) is the extra-intestinal manifestation of "creeping fat" (CrF), defined as expansion of mesenteric adipose tissue around the inflamed and fibrotic intestine. In the current study, we explore whether microbial translocation in CD serves as a central cue for CrF development. We discovered a subset of mucosal-associated gut bacteria that consistently translocated and remained viable in CrF in CD ileal surgical resections, and identified Clostridium innocuum as a signature of this consortium with strain variation between mucosal and adipose isolates, suggesting preference for lipid-rich environments. Single-cell RNA sequencing characterized CrF as both pro-fibrotic and pro-adipogenic with a rich milieu of activated immune cells responding to microbial stimuli, which we confirm in gnotobiotic mice colonized with C. innocuum. Ex vivo validation of expression patterns suggests C. innocuum stimulates tissue remodeling via M2 macrophages, leading to an adipose tissue barrier that serves to prevent systemic dissemination of bacteria.
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Affiliation(s)
- Connie W Y Ha
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Anthony Martin
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Gregory D Sepich-Poore
- Department of Bioengineering, University of California San Diego, La Jolla, California 92093, USA
| | - Baochen Shi
- Department of Molecular and Medical Pharmacology, Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Yizhou Wang
- Applied Genomics, Computation and Translational Core, Cedars-Sinai Cancer, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Kenneth Gouin
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA; Applied Genomics, Computation and Translational Core, Cedars-Sinai Cancer, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Gregory Humphrey
- Department of Pediatrics, University of California San Diego, La Jolla, CA 92093, USA
| | - Karenina Sanders
- Department of Pediatrics, University of California San Diego, La Jolla, CA 92093, USA
| | | | | | - Gustaf Hendrick
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - J R Caldera
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Christian Arias
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Jacob E Moskowitz
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Shannan J Ho Sui
- Harvard Chan Bioinformatics Core, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
| | - Shaohong Yang
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - David Underhill
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA; Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Matthew J Brady
- Department of Medicine, Section of Endocrinology and Metabolism, The University of Chicago, Chicago, IL 60637, USA
| | - Simon Knott
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA; Applied Genomics, Computation and Translational Core, Cedars-Sinai Cancer, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | | | - Michael J Steinbaugh
- Harvard Chan Bioinformatics Core, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
| | - Huiying Li
- Department of Molecular and Medical Pharmacology, Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Dermot P B McGovern
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Rob Knight
- Department of Pediatrics, University of California San Diego, La Jolla, CA 92093, USA; Department of Computer Science and Engineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Phillip Fleshner
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA; Division of Colorectal Surgery, Department of Surgery, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Suzanne Devkota
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA; Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA.
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3
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Landa LR, Harbeck M, Kaihara K, Chepurny O, Kitiphongspattana K, Graf O, Nikolaev VO, Lohse MJ, Holz GG, Roe MW. Interplay of Ca2+ and cAMP signaling in the insulin-secreting MIN6 beta-cell line. J Biol Chem 2005; 280:31294-302. [PMID: 15987680 PMCID: PMC3508785 DOI: 10.1074/jbc.m505657200] [Citation(s) in RCA: 174] [Impact Index Per Article: 9.2] [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] [Indexed: 11/06/2022] Open
Abstract
Ca2+ and cAMP are important second messengers that regulate multiple cellular processes. Although previous studies have suggested direct interactions between Ca2+ and cAMP signaling pathways, the underlying mechanisms remain unresolved. In particular, direct evidence for Ca2+-regulated cAMP production in living cells is incomplete. Genetically encoded fluorescence resonance energy transfer-based biosensors have made possible real-time imaging of spatial and temporal gradients of intracellular cAMP concentration in single living cells. Here, we used confocal microscopy, fluorescence resonance energy transfer, and insulin-secreting MIN6 cells expressing Epac1-camps, a biosynthetic unimolecular cAMP indicator, to better understand the role of intracellular Ca2+ in cAMP production. We report that depolarization with high external K+, tolbutamide, or glucose caused a rapid increase in cAMP that was dependent on extracellular Ca2+ and inhibited by nitrendipine, a Ca2+ channel blocker, or 2',5'-dideoxyadenosine, a P-site antagonist of transmembrane adenylate cyclases. Stimulation of MIN6 cells with glucose in the presence of tetraethylammonium chloride generated concomitant Ca2+ and cAMP oscillations that were abolished in the absence of extracellular Ca2+ and blocked by 2',5'-dideoxyadenosine or 3-isobutyl-1-methylxanthine, an inhibitor of phosphodiesterase. Simultaneous measurements of Ca2+ and cAMP concentrations with Fura-2 and Epac1-camps, respectively, revealed a close temporal and causal interrelationship between the increases in cytoplasmic Ca2+ and cAMP levels following membrane depolarization. These findings indicate highly coordinated interplay between Ca2+ and cAMP signaling in electrically excitable endocrine cells and suggest that Ca2+-dependent cAMP oscillations are derived from an increase in adenylate cyclase activity and periodic activation and inactivation of cAMP-hydrolyzing phosphodiesterase.
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Affiliation(s)
- Luis R. Landa
- Department of Medicine, The University of Chicago, Chicago, Illinois 60637
| | - Mark Harbeck
- Department of Medicine, The University of Chicago, Chicago, Illinois 60637
| | - Kelly Kaihara
- Department of Medicine, The University of Chicago, Chicago, Illinois 60637
| | - Oleg Chepurny
- Department of Physiology and Neuroscience, New York University School of Medicine, New York, New York 10016
| | | | - Oliver Graf
- Department of Medicine, The University of Chicago, Chicago, Illinois 60637
| | - Viacheslav O. Nikolaev
- Institute of Pharmacology and Toxicology, University of Würzburg, D-97078 Würzburg, Germany
| | - Martin J. Lohse
- Institute of Pharmacology and Toxicology, University of Würzburg, D-97078 Würzburg, Germany
| | - George G. Holz
- Department of Physiology and Neuroscience, New York University School of Medicine, New York, New York 10016
| | - Michael W. Roe
- Department of Medicine, The University of Chicago, Chicago, Illinois 60637
- To whom correspondence should be addressed: Dept. of Medicine MC-1027, The University of Chicago, 5841 South Maryland Ave., Chicago, IL 60637. Tel.: 773-702-4965; Fax: 773-834-0486;
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Hara M, Bindokas V, Lopez JP, Kaihara K, Landa LR, Harbeck M, Roe MW. Imaging endoplasmic reticulum calcium with a fluorescent biosensor in transgenic mice. Am J Physiol Cell Physiol 2004; 287:C932-8. [PMID: 15163621 DOI: 10.1152/ajpcell.00151.2004] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [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] [Indexed: 11/22/2022]
Abstract
The use of biosynthetic fluorescent sensors is an important new approach for imaging Ca2+ in cells. Genetically encoded indicators based on green fluorescent protein, calmodulin, and fluorescence resonance energy transfer (FRET) have been utilized to measure Ca2+ in nonmammalian transgenic organisms and provide information about the organization and regulation of Ca2+ signaling events in vivo. However, expression of biosynthetic FRET-based Ca2+ indicators in transgenic mammals has proven to be problematic. Here, we report transgenic expression of an endoplasmic reticulum (ER) Ca2+ biosensor in mouse pancreas. We targeted expression of a yellow cameleon3.3er (YC3.3er) transgene with mouse insulin I promoter. YC3.3er protein expression was limited to pancreatic β-cells within islets of Langerhans and absent in the exocrine pancreas and other tissues. Animals developed and matured normally; sensor expression was unaffected by age. Glucose tolerance in transgenic mice was also unaffected, indicating the transgenic biosensor did not impair endocrine pancreas function. ER Ca2+ responses after administration of thapsigargin, carbachol, and glucose were measured in individual β-cells of intact islets using confocal microscopy and confirmed the function of the biosensor. We conclude that controlling transgene transcription with a cell-specific promoter permits transgenic expression of FRET-based Ca2+ sensors in mammals and that this approach will facilitate real-time optical imaging of signal transduction events in living tissues.
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Affiliation(s)
- Manami Hara
- Department of Medicine MC1027, The University of Chicago, 5841 South Maryland Ave., Chicago, IL 60637, USA
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5
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Zhou XY, Shibusawa N, Naik K, Porras D, Temple K, Ou H, Kaihara K, Roe MW, Brady MJ, Wondisford FE. Insulin regulation of hepatic gluconeogenesis through phosphorylation of CREB-binding protein. Nat Med 2004; 10:633-7. [PMID: 15146178 DOI: 10.1038/nm1050] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.4] [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: 03/14/2004] [Accepted: 04/20/2004] [Indexed: 12/23/2022]
Abstract
Hepatic gluconeogenesis is essential for maintenance of normal blood glucose concentrations and is regulated by opposing stimulatory (cyclic adenosine monophosphate, cAMP) and inhibitory (insulin) signaling pathways. The cAMP signaling pathway leads to phosphorylation of cAMP response element-binding (CREB) protein, resulting in recruitment of the coactivators CREB-binding protein (CBP) and p300 and subsequent activation of gluconeogenesis. Insulin signaling leads to phosphorylation of CBP at serine 436, a residue near its CREB-interacting domain, but it is unknown whether this event modulates cAMP signaling. Here, we show in vitro and in 'knock-in' mice that a mutant CBP (S436A) is aberrantly recruited to CREB protein, resulting in inappropriate activation of gluconeogenesis in the fed state and glucose intolerance resulting from increased hepatic glucose production. We propose that insulin signaling may directly regulate many cAMP signaling pathways at the transcriptional level by controlling CBP recruitment.
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Affiliation(s)
- Xiao Yan Zhou
- Department of Medicine and Committee on Molecular Metabolism and Nutrition, Biological Sciences Division, University of Chicago, Chicago, Illinois 60637, USA
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6
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Kobayashi K, Matsuura E, Liu Q, Furukawa J, Kaihara K, Inagaki J, Atsumi T, Sakairi N, Yasuda T, Voelker DR, Koike T. A specific ligand for beta(2)-glycoprotein I mediates autoantibody-dependent uptake of oxidized low density lipoprotein by macrophages. J Lipid Res 2001; 42:697-709. [PMID: 11352976] [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: 04/16/2023] Open
Abstract
beta(2)-Glycoprotein I (beta(2)-GPI) is a major antigen for antiphospholipid antibodies (Abs) present in patients with the antiphospholipid syndrome (APS). We previously reported that beta(2)-GPI specifically binds to oxidized low density lipoprotein (oxLDL), but not to native low density lipoprotein (LDL). In the present study, a ligand specific for beta(2)-GPI, oxLig-1, was purified from the extracted lipids of oxLDL. The structure of oxLig-1 was shown to be identical to that of synthesized 7-ketocholesteryl-9-carboxynonanoate by mass spectroscopy and nuclear magnetic resonance analyses. Both purified and synthesized oxLig-1 were recognized by beta(2)-GPI and subsequently by anti-beta(2)-GPI auto-Abs, either in enzyme-linked immunosorbent assay (ELISA) or in ligand blot analysis. Binding of liposomes containing oxLig-1 (oxLig-1-liposomes) to mouse macrophages, J774A.1 cells, was relatively low, as compared with that of phosphatidylserine (PS)-liposomes. In contrast, binding of oxLig-1-liposomes was enhanced more than 10-fold in the presence of both beta(2)-GPI and an anti-beta(2)-GPI auto-Ab (WB-CAL-1), derived from (NZW x BXSB) F1 mouse, an animal APS model. Anti-beta(2)-GPI auto-Abs derived from APS patients with episodes of arterial thrombosis were detected in ELISA, using a solid phase oxLig-1 complexed with beta(2)-GPI. We suggest that autoimmune atherogenesis linked to beta(2)-GPI interaction with oxLDL and Abs may be present in APS.
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Affiliation(s)
- K Kobayashi
- Department of Cell Chemistry, Institute of Cellular and Molecular Biology, Okayama University Medical School, Okayama 700-8558, Japan
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7
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Inagaki J, Matsuura E, Nomizu M, Sugiura-Ogasawara M, Katano K, Kaihara K, Kobayashi K, Yasuda T, Aoki K. IgG anti-laminin-1 autoantibody and recurrent miscarriages. Am J Reprod Immunol 2001; 45:232-8. [PMID: 11327550 DOI: 10.1111/j.8755-8920.2001.450406.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [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] Open
Abstract
PROBLEM The present study assesses the clinical significance of anti-laminin-1 auto-antibodies (auto-Abs) in recurrent miscarriages. METHOD OF STUDY A total of 207 recurrent aborters with a history of two or more consecutive first-trimester miscarriages were tested for the presence of anti-laminin-1 Abs, beta2-glycoprotein I-dependent anticardiolipin Abs, lupus anticoagulants, anti-DNA Abs, and anti-nuclear Abs, before they had conceived again. Recurrent aborters then were followed up during subsequent pregnancies and their outcomes were evaluated relative to their blood test results prior to pregnancy. RESULTS Fifty-five (31.1%) women out of 177 recurrent aborters were positive for IgG anti-laminin-1 auto-Abs. The levels of IgG anti-laminin-1 auto-Abs in recurrent aborters were significantly higher than those in healthy pregnant women and in healthy non-pregnant women (P = 0.0043 and 0.0073, respectively). The live birth rate of subsequent pregnancies in IgG anti-laminin-1 auto-Abs-positive recurrent aborters was significantly lower than the IgG anti-laminin-1 auto-Abs-negative recurrent aborters (P = 0.0320). There were no specifically significant relationships observed between IgG anti-laminin-1 auto-Abs and other tested auto-Abs. CONCLUSION IgG anti-laminin-1 auto-Abs are associated with recurrent miscarriages and the subsequent pregnancy outcome of recurrent aborters.
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Affiliation(s)
- J Inagaki
- Department of Cell Chemistry, Institute of Cellular and Molecular Biology, Okayama University Medical School, Japan
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Matsuura E, Inagaki J, Kasahara H, Yamamoto D, Atsumi T, Kobayashi K, Kaihara K, Zhao D, Ichikawa K, Tsutsumi A, Yasuda T, Triplett DA, Koike T. Proteolytic cleavage of beta(2)-glycoprotein I: reduction of antigenicity and the structural relationship. Int Immunol 2000; 12:1183-92. [PMID: 10917893 DOI: 10.1093/intimm/12.8.1183] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [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: 11/14/2022] Open
Abstract
Binding of beta(2)-glycoprotein I (beta(2)-GPI)-dependent anticardiolipin antibodies (aCL) derived from antiphospholipid syndrome (APS) is significantly reduced in aCL ELISA due to loss of the phospholipid (PL) binding property of beta(2)-GPI by plasmin treatment. In the present study, the treatment generated a nicked form of beta(2)-GPI and resulted in loss of antigenicity for the autoantibodies detected in ELISA, using an beta(2)-GPI directly adsorbed polyoxygenated carboxylated plate, the assay system of which was not related to PL binding. The nicked form bound to neither Cu(2+)-oxidized low-density lipoprotein (oxLDL) nor to beta(2)-GPI-specific lipid ligands isolated from oxLDL, the result being a complete loss of subsequent binding of anti-beta(2)-GPI autoantibodies. The conformational change in the nicked domain V was predicted from its intact structure determined by an X-ray analysis (implemented in Protein Data Bank: 1C1Z), molecular modeling and epitope mapping of a monoclonal anti-beta(2)-GPI antibody, i.e. Cof-18, which recognizes the related structure. The analysis revealed that novel hydrophobic and electrostatic interactions appeared in domain V after the cleavage, thereby affecting the PL binding of beta(2)-GPI. Such a conformational change may have important implications for exposure of cryptic epitopes located in the domains such as domain IV.
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Affiliation(s)
- E Matsuura
- Department of Cell Chemistry, Institute of Cellular and Molecular Biology, Okayama University Medical School, 2-5-1 Shikata-cho, Okayama 700-8558, Japan
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Mishina T, Kitao R, Jingami Y, Kaihara K, Imano H. [Evaluation of the home nursing records for the past year and the resultant fundamental changes in the attitude to work. Discussion]. Hokenfu Zasshi 1977; 33:672-83. [PMID: 244617] [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: 12/14/2022]
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