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Murphy AW, Cupples ME, Smith SM, Byrne M, Byrne MC, Newell J. Effect of tailored practice and patient care plans on secondary prevention of heart disease in general practice: cluster randomised controlled trial. BMJ 2009; 339:b4220. [PMID: 19875426 PMCID: PMC2770592 DOI: 10.1136/bmj.b4220] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVE To test the effectiveness of a complex intervention designed, within a theoretical framework, to improve outcomes for patients with coronary heart disease. DESIGN Cluster randomised controlled multicentre trial. SETTING General practices in Northern Ireland and the Republic of Ireland, regions with different healthcare systems. PARTICIPANTS 903 patients with established coronary heart disease registered with one of 48 practices. INTERVENTION Tailored care plans for practices (practice based training in prescribing and behaviour change, administrative support, quarterly newsletter), and tailored care plans for patients (motivational interviewing, goal identification, and target setting for lifestyle change) with reviews every four months at the practices. Control practices provided usual care. MAIN OUTCOME MEASURES The proportion of patients at 18 month follow-up above target levels for blood pressure and total cholesterol concentration, and those admitted to hospital, and changes in physical and mental health status (SF-12). RESULTS At baseline the numbers (proportions) of patients above the recommended limits were: systolic blood pressure greater than 140 mm Hg (305/899; 33.9%, 95% confidence interval 30.8% to 33.9%), diastolic blood pressure greater than 90 mm Hg (111/901; 12.3%, 10.2% to 14.5%), and total cholesterol concentration greater than 5 mmol/l (188/860; 20.8%, 19.1% to 24.6%). At the 18 month follow-up there were no significant differences between intervention and control groups in the numbers (proportions) of patients above the recommended limits: systolic blood pressure, intervention 98/360 (27.2%) v control, 133/405 (32.8%), odds ratio 1.51 (95% confidence interval 0.99 to 2.30; P=0.06); diastolic blood pressure, intervention 32/360 (8.9%) v control, 40/405 (9.9%), 1.40 (0.75 to 2.64; P=0.29); and total cholesterol concentration, intervention 52/342 (15.2%) v control, 64/391 (16.4%), 1.13 (0.63 to 2.03; P=0.65). The number of patients admitted to hospital over the 18 month study period significantly decreased in the intervention group compared with the control group: 107/415 (25.8%) v 148/435 (34.0%), 1.56 (1.53 to 2.60; P=0.03). CONCLUSIONS Admissions to hospital were significantly reduced after an intensive 18 month intervention to improve outcomes for patients with coronary heart disease, but no other clinical benefits were shown, possibly because of a ceiling effect related to improved management of the disease. TRIAL REGISTRATION Current Controlled Trials ISRCTN24081411.
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Affiliation(s)
- A W Murphy
- Department of General Practice, National University of Ireland Galway, Ireland.
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2
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Cupples ME, Byrne MC, Smith SM, Leathem CS, Murphy AW. Secondary prevention of cardiovascular disease in different primary healthcare systems with and without pay-for-performance. Heart 2008; 94:1594-600. [PMID: 18701532 DOI: 10.1136/hrt.2008.145912] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [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: 11/03/2022] Open
Abstract
OBJECTIVE To compare baseline cardiovascular risk management between people from two different healthcare systems recruited to a research trial of an intervention to optimise secondary prevention. DESIGN Cross-sectional study. SETTING 16 randomly selected general practices in Northern Ireland (NI) (UK NHS, strong infrastructure, pay-for-performance) and 32 in the Republic of Ireland (RoI) (mixed healthcare economy, less infrastructure, no pay-for-performance). PATIENTS 903 (mean age 67.5 years; 69.9% male) randomly selected patients with known coronary heart disease. MAIN OUTCOME MEASURES Blood pressure (BP), cholesterol, medications; validated questionnaires for diet (DINE), exercise (Godin) and quality of life (SF-12); healthcare usage. RESULTS More RoI than NI participants had systolic BP >140 mm Hg (37% vs 28%, p = 0.01) and cholesterol >5 mmol/l (24% vs 17%, p = 0.02). RoI mean systolic BP was higher (139 vs 132 mm Hg). More RoI participants reported a high fibre intake (35% vs 23%), higher levels of physical activity (62% vs 44%) and better physical and mental health (SF-12); they also had more GP (5.6 vs 4.4) and fewer nurse visits (1.6 vs 2.1) in the previous year. Fewer participants in the RoI (55% vs 70%) were prescribed beta blockers. ACE inhibitor prescribing was similar for both groups (41%; 48%); high proportions were prescribed statins (84%; 85%) and aspirin (83%; 77%). CONCLUSIONS BP and cholesterol are better controlled among patients in a primary healthcare system with a strong infrastructure supporting computerisation and rewarding measured performance, but this is not associated with healthier lifestyle or better quality of life. Further exploration of differences in professionals' and patients' engagement in secondary prevention in different healthcare systems is needed.
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Affiliation(s)
- M E Cupples
- Public Health Medicine and Primary Care, Queen's University, Belfast, UK.
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3
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Byrne MC, Whitley MZ, Follettie MT. Preparation of mRNA for expression monitoring. ACTA ACUST UNITED AC 2008; Chapter 4:Unit 4.26. [PMID: 18428486 DOI: 10.1002/0471142301.ns0426s16] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The ability to construct comprehensive gene expression profiles comprising hundreds to thousands of genes whose RNA levels are monitored simultaneously represents an exciting new capability in molecular biology. This is accomplished by hybridizing mRNA, which has been quantitatively amplified and labeled with biotin, to DNA chips that display thousands of nucleotides complementary to the mRNAs of interest. In this unit, rationale for starting with poly(A(+)) versus total RNA is discussed, and strategies for choosing oligonucleotides for chip design is presented. Protocols on RNA amplification and labeling, and purifying and quantifying the cDNA and in vitro transcription products are included.
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Affiliation(s)
- M C Byrne
- Genetics Institute/Wyeth Research, Cambridge, Massachusetts, USA
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4
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Abstract
This unit provides protocols for the amplification and labeling of mRNA (and the necessary controls) for hybridization to oligonucleotide arrays. It also describes methods for processing and normalizing the raw gene expression data in preparation for clustering and further analysis.
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Affiliation(s)
- M C Byrne
- Genetics Institute, Cambridge, Massachusetts, USA
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5
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Abstract
The ability to construct comprehensive gene expression profiles comprising hundreds to thousands of genes whose RNA levels are monitored simultaneously represents an exciting new capability in molecular biology. This is accomplished by hybridizing mRNA, which has been quantitatively amplified and labeled with biotin, to DNA chips that display thousands of nucleotides complementary to the mRNAs of interest. In this unit, rationale for starting with poly(A(+)) vs. total RNA is discussed, and strategies for choosing oligonucleotides for chip design is presented. Protocols on RNA amplification and labeling, and purifying and quantifying the cDNA and in vitro transcription products are included.
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Affiliation(s)
- M C Byrne
- Genetics Institute, Cambridge, Massachusetts, USA
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6
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Locklin RM, Riggs BL, Hicok KC, Horton HF, Byrne MC, Khosla S. Assessment of gene regulation by bone morphogenetic protein 2 in human marrow stromal cells using gene array technology. J Bone Miner Res 2001; 16:2192-204. [PMID: 11760832 DOI: 10.1359/jbmr.2001.16.12.2192] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Marrow stromal cells can differentiate into osteoblasts, adipocytes, myoblasts, and chondrocytes. Bone morphogenetic protein 2 (BMP-2) is a potent stimulator of osteoblastic differentiation, and identification of the genes regulated by BMP-2 in these cells should provide insight into the mechanism(s) of osteoblastic differentiation. Thus, we used a conditionally immortalized human marrow stromal cell line (hMS) and a gene expression microarray containing probes for a total of 6800 genes to compare gene expression in control and BMP-2-treated cultures. A total of 51 genes showed a consistent change in messenger RNA (mRNA) frequency between two repeat experiments. Seventeen of these genes showed a change in expression of at least 3-fold in BMP-2-treated cultures over control cultures. These included nuclear binding factors (10 genes), signal transduction pathway genes (2 genes), molecular transport (1 gene), cell surface proteins (2 genes) and growth factors (2 genes). Of particular interest were four of the nuclear binding factor genes ID-1, ID-2, ID-3, and ID-4. These encode dominant negative helix-loop-helix (dnHLH) proteins that lack the nuclear binding domain of the basic HLH proteins and thus have no transcriptional activity. They have been implicated in blocking both myogenesis and adipogenesis. Other transcription factors up-regulated at least 3-fold by BMP-2 included Dlx-2, HES-1, STAT1, and JunB. The changes in these nuclear binding factor mRNA levels were confirmed by real-time reverse-transcriptase-polymerase chain reaction (RT-PCR). A further three transcription factors, core binding factor beta (CBFbeta), AREB6, and SOX4, showed changes in expression of between 2- and 3-fold with BMP-2 treatment. In summary, we have used a gene chip microarray to identify a number of BMP-2 responsive genes in hMS cells. Thus, these studies provide potential candidate genes that may induce osteoblastic differentiation or, in the case of the ID proteins, block differentiation along alternate pathways.
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Affiliation(s)
- R M Locklin
- Endocrine Research Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA
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7
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Abstract
Since their discovery as cells bearing both TCRs and NK cell receptors, NKT cells have been intensively studied as a possible bridge between innate and adaptive immunity. Although their involvement in a wide variety of immune responses and in disease states have been well documented, molecular details of this functionality have been lacking. Recently, transcriptional profiling using microarrays has been applied to these cells, pinpointing gene-expression differences between this regulatory T cell subset and conventional T cells, and providing a framework for subset-specific therapeutic intervention in clinical settings.
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Affiliation(s)
- S B Wilson
- Cancer Immunology & AIDS Department, Dana 1416, Dana Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA.
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8
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Abstract
Naive Th cells can be directed in vitro to develop into Th1 or Th2 cells by IL-12 or IL-4, respectively. In vivo, chronic immune reactions lead to polarized Th cytokine patterns. We found earlier that Borrelia burgdorferi, the spirochaete that causes Lyme disease, induces Th1 development in alpha beta TCR-transgenic Th cells. Here, we used TCR-transgenic Th cells and oligonucleotide arrays to analyze the differences between Th1 cells induced by IL-12 vs those induced by B. burgdorferi. Transgenic Th cells primed with peptide in the presence of B. burgdorferi expressed several mRNAs, including the mRNA encoding IL-17, at significantly higher levels than Th cells primed with peptide and IL-12. Cytometric single-cell analysis of Th cell cytokine production revealed that IL-17 cannot be categorized as either Th1 or Th2 cytokine. Instead, almost all IL-17-producing Th cells simultaneously produced TNF-alpha and most IL-17(+) Th cells also produced GM-CSF. This pattern was also observed in humans. Th cells from synovial fluid of patients with Lyme arthritis coexpressed IL-17 and TNF-alpha upon polyclonal stimulation. The induction of IL-17 production in Th cells is not restricted to B. burgdorferi. Priming of TCR-transgenic Th cells in the presence of mycobacterial lysates also induced IL-17/TNF-alpha coproduction. The physiological stimulus for IL-17 production was hitherto unknown. We show here for the first time that microbial stimuli induce the expression of IL-17 together with TNF-alpha in both murine and human T cells. Chronic IL-17 expression induced by microbes could be an important mediator of infection-induced immunopathology.
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MESH Headings
- Animals
- Arthritis, Reactive/immunology
- Bacterial Proteins/chemical synthesis
- Bacterial Proteins/immunology
- Borrelia burgdorferi Group/immunology
- CD4-Positive T-Lymphocytes/immunology
- CD4-Positive T-Lymphocytes/metabolism
- CD4-Positive T-Lymphocytes/microbiology
- Cell Differentiation/genetics
- Cell Differentiation/immunology
- Cells, Cultured
- Chemokines/biosynthesis
- Chemokines/genetics
- Cytokines/biosynthesis
- Cytokines/genetics
- Granulocyte-Macrophage Colony-Stimulating Factor/biosynthesis
- Humans
- Immunophenotyping
- Interleukin-12/physiology
- Interleukin-17/biosynthesis
- Interleukin-18/physiology
- Interleukin-6/physiology
- Lipoproteins/chemical synthesis
- Lipoproteins/immunology
- Lyme Disease/immunology
- Lymphocyte Activation/genetics
- Mice
- Mice, Inbred BALB C
- Mice, Transgenic
- Peptides/chemical synthesis
- Peptides/immunology
- RNA, Messenger/biosynthesis
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Synovial Fluid/cytology
- Synovial Fluid/immunology
- Synovial Fluid/metabolism
- Synovial Fluid/microbiology
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
- T-Lymphocyte Subsets/microbiology
- T-Lymphocytes, Helper-Inducer/cytology
- T-Lymphocytes, Helper-Inducer/immunology
- T-Lymphocytes, Helper-Inducer/metabolism
- T-Lymphocytes, Helper-Inducer/microbiology
- Th1 Cells/immunology
- Th1 Cells/metabolism
- Th2 Cells/immunology
- Th2 Cells/metabolism
- Tumor Necrosis Factor-alpha/biosynthesis
- Up-Regulation/genetics
- Up-Regulation/immunology
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Affiliation(s)
- C Infante-Duarte
- Deutsches Rheumaforschungszentrum, Berlin, Germany. Genetics Institute, Cambridge, MA 02140, USA
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9
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Freeman GJ, Long AJ, Iwai Y, Bourque K, Chernova T, Nishimura H, Fitz LJ, Malenkovich N, Okazaki T, Byrne MC, Horton HF, Fouser L, Carter L, Ling V, Bowman MR, Carreno BM, Collins M, Wood CR, Honjo T. Engagement of the PD-1 immunoinhibitory receptor by a novel B7 family member leads to negative regulation of lymphocyte activation. J Exp Med 2000; 192:1027-34. [PMID: 11015443 PMCID: PMC2193311 DOI: 10.1084/jem.192.7.1027] [Citation(s) in RCA: 3735] [Impact Index Per Article: 155.6] [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] [Indexed: 12/13/2022] Open
Abstract
PD-1 is an immunoinhibitory receptor expressed by activated T cells, B cells, and myeloid cells. Mice deficient in PD-1 exhibit a breakdown of peripheral tolerance and demonstrate multiple autoimmune features. We report here that the ligand of PD-1 (PD-L1) is a member of the B7 gene family. Engagement of PD-1 by PD-L1 leads to the inhibition of T cell receptor-mediated lymphocyte proliferation and cytokine secretion. In addition, PD-1 signaling can inhibit at least suboptimal levels of CD28-mediated costimulation. PD-L1 is expressed by antigen-presenting cells, including human peripheral blood monocytes stimulated with interferon gamma, and activated human and murine dendritic cells. In addition, PD-L1 is expressed in nonlymphoid tissues such as heart and lung. The relative levels of inhibitory PD-L1 and costimulatory B7-1/B7-2 signals on antigen-presenting cells may determine the extent of T cell activation and consequently the threshold between tolerance and autoimmunity. PD-L1 expression on nonlymphoid tissues and its potential interaction with PD-1 may subsequently determine the extent of immune responses at sites of inflammation.
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Affiliation(s)
- G J Freeman
- Department of Adult Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
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10
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Yang OO, Racke FK, Nguyen PT, Gausling R, Severino ME, Horton HF, Byrne MC, Strominger JL, Wilson SB. CD1d on myeloid dendritic cells stimulates cytokine secretion from and cytolytic activity of V alpha 24J alpha Q T cells: a feedback mechanism for immune regulation. J Immunol 2000; 165:3756-62. [PMID: 11034380 DOI: 10.4049/jimmunol.165.7.3756] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The precise immunologic functions of CD1d-restricted, CD161+ AV24AJ18 (Valpha24JalphaQ) T cells are not well defined, although production of IL-4 has been suggested as important for priming Th2 responses. However, activation of human Valpha24JalphaQ T cell clones by anti-CD3 resulted in the secretion of multiple cytokines notably important for the recruitment and differentiation of myeloid dendritic cells. Specific activation of Valpha24JalphaQ T cells was CD1d restricted. Expression of CD1d was found on monocyte-derived dendritic cells in vitro, and immunohistochemical staining directly revealed CD1d preferentially expressed on dendritic cells in the paracortical T cell zones of lymph nodes. Moreover, myeloid dendritic cells both activated Valpha24JalphaQ T cells and were susceptible to lysis by these same regulatory T cells. Because myeloid dendritic cells are a major source of IL-12 and control Th1 cell differentiation, their elimination by lysis is a mechanism for limiting the generation of Th1 cells and thus regulating Th1/Th2 responses.
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MESH Headings
- Antibodies, Monoclonal/pharmacology
- Antigens, CD1/biosynthesis
- Antigens, CD1/immunology
- Cell Line, Transformed/immunology
- Cell Line, Transformed/metabolism
- Cell Lineage/immunology
- Clone Cells
- Cytokines/metabolism
- Cytotoxicity, Immunologic/immunology
- Dendritic Cells/immunology
- Dendritic Cells/metabolism
- Feedback
- Humans
- Lymphocyte Activation/immunology
- Monocytes/immunology
- Receptors, Antigen, T-Cell, alpha-beta/biosynthesis
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
- T-Lymphocytes, Cytotoxic/immunology
- T-Lymphocytes, Cytotoxic/metabolism
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Affiliation(s)
- O O Yang
- Division of Infectious Diseases, University of California Medical Center, Los Angeles 90095, USA.
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11
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Wilson SB, Kent SC, Horton HF, Hill AA, Bollyky PL, Hafler DA, Strominger JL, Byrne MC. Multiple differences in gene expression in regulatory Valpha 24Jalpha Q T cells from identical twins discordant for type I diabetes. Proc Natl Acad Sci U S A 2000; 97:7411-6. [PMID: 10840051 PMCID: PMC16559 DOI: 10.1073/pnas.120161297] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.5] [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: 11/18/2022] Open
Abstract
Quantitative and qualitative defects in CD1d-restricted T cells have been demonstrated in human and murine autoimmune diseases. To investigate the transcriptional consequences of T cell receptor activation in human Valpha24JalphaQ T cell clones, DNA microarrays were used to quantitate changes in mRNA levels after anti-CD3 stimulation of clones derived from identical twins discordant for type 1 diabetes and IL-4 secretion. Activation resulted in significant modulation of 226 transcripts in the IL-4 secreting clone and 86 in the IL-4-null clone. Only 28 of these genes were in common. The differences observed suggest both ineffective differentiation of diabetic Valpha24JalphaQ T cells and a role for invariant T cells in the recruitment and activation of cells from the myeloid lineage.
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Affiliation(s)
- S B Wilson
- Cancer Immunology and AIDS, Dana Farber Cancer Institute, Boston, MA 02115, USA.
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12
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Reimold AM, Etkin A, Clauss I, Perkins A, Friend DS, Zhang J, Horton HF, Scott A, Orkin SH, Byrne MC, Grusby MJ, Glimcher LH. An essential role in liver development for transcription factor XBP-1. Genes Dev 2000. [PMID: 10652269 DOI: 10.1101/gad.14.2.152] [Citation(s) in RCA: 236] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
XBP-1 is a CREB/ATF family transcription factor highly expressed in hepatocellular carcinomas. Here we report that XBP-1 is essential for liver growth. Mice lacking XBP-1 displayed hypoplastic fetal livers, whose reduced hematopoiesis resulted in death from anemia. Nevertheless, XBP-1-deficient hematopoietic progenitors had no cell-autonomous defect in differentiation. Rather, hepatocyte development itself was severely impaired by two measures: diminished growth rate and prominent apoptosis. Specific target genes of XBP-1 in the liver were identified as alphaFP, which may be a regulator of hepatocyte growth, and three acute phase protein family members. Therefore, XBP-1 is a transcription factor essential for hepatocyte growth.
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Affiliation(s)
- A M Reimold
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, Massachusetts 02115 USA
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13
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Reimold AM, Etkin A, Clauss I, Perkins A, Friend DS, Zhang J, Horton HF, Scott A, Orkin SH, Byrne MC, Grusby MJ, Glimcher LH. An essential role in liver development for transcription factor XBP-1. Genes Dev 2000; 14:152-7. [PMID: 10652269 PMCID: PMC316338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
XBP-1 is a CREB/ATF family transcription factor highly expressed in hepatocellular carcinomas. Here we report that XBP-1 is essential for liver growth. Mice lacking XBP-1 displayed hypoplastic fetal livers, whose reduced hematopoiesis resulted in death from anemia. Nevertheless, XBP-1-deficient hematopoietic progenitors had no cell-autonomous defect in differentiation. Rather, hepatocyte development itself was severely impaired by two measures: diminished growth rate and prominent apoptosis. Specific target genes of XBP-1 in the liver were identified as alphaFP, which may be a regulator of hepatocyte growth, and three acute phase protein family members. Therefore, XBP-1 is a transcription factor essential for hepatocyte growth.
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Affiliation(s)
- A M Reimold
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, Massachusetts 02115 USA
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14
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Abstract
Thousands of genes are currently being discovered by sequencing the human genome. Of these, hundreds if not thousands fall into regions of the genome identified by genetic studies as linked to the development of type 1 diabetes. Inheritance patterns for these regions suggest that diabetes results from the combinatorial interaction of susceptibility loci. The study of such complex events will require technologies that can simultaneously evaluate expression profiles and allelic differences for all these genes in order to dissect the mechanisms responsible for the development of disease. We will argue that DNA microarrays are the natural vehicle for the exploration of diabetes-related gene clusters, and the application of these arrays to understanding diabetes is discussed.
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Affiliation(s)
- W H Kitchens
- Cancer Immunology & AIDS, Dana Farber Cancer Institute, Boston, Massachusetts 02115, USA
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15
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Kumar TR, Palapattu G, Wang P, Woodruff TK, Boime I, Byrne MC, Matzuk MM. Transgenic models to study gonadotropin function: the role of follicle-stimulating hormone in gonadal growth and tumorigenesis. Mol Endocrinol 1999; 13:851-65. [PMID: 10379885 DOI: 10.1210/mend.13.6.0297] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.0] [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: 11/19/2022] Open
Abstract
The role of FSH in gonadal tumorigenesis and, in particular, in human ovarian cancer has been debated. It is also unclear what role the elevated FSH levels in the inhibin-deficient mouse play in the gonadal tumorigenesis. To directly assess the role of FSH in gonadal growth, differentiation, and gonadal tumorigenesis, we have generated both gain-of-function and loss-of-function transgenic mutant mice. In the gain-of-function model, we have generated transgenic mice that ectopically overexpress human FSH from multiple tissues using a mouse metallothionein-1 promoter, achieving levels far exceeding those seen in postmenopausal women. Male transgenic mice are infertile despite normal testicular development and demonstrate enlarged seminal vesicles secondary to elevated serum testosterone levels. Female transgenic mice develop highly hemorrhagic and cystic ovaries, have elevated serum estradiol and progesterone levels, and are infertile, mimicking the features of human ovarian hyperstimulation and polycystic ovarian syndromes. Furthermore, the female transgenic mice develop enlarged and cystic kidneys and die between 6-13 weeks as a result of urinary bladder obstruction. In a complementary loss-of-function approach, we have generated double-homozygous mutant mice that lack both inhibin and FSH by a genetic intercross. In contrast to male mice lacking inhibin alone, 95% of which die of a cancer cachexia-like syndrome by 12 weeks of age, only 30% of the double-mutant male mice lacking both FSH and inhibin die by 1 yr of age. The remaining double-mutant male mice develop slow-growing and less hemorrhagic testicular tumors, which are noted after 12 weeks of age, and have minimal cachexia. Similarly, the double-mutant female mice develop slow-growing, less hemorrhagic ovarian tumors, and 70% of these mice live beyond 17 weeks. The double-mutant mice demonstrate minimal cachexia in contrast to female mice lacking only inhibin, which develop highly hemorrhagic ovarian tumors, leading to cachexia and death by 17 weeks of age in 95% of the cases. The milder cachexia-like symptoms of the inhibin and FSH double-mutant mice are correlated with low levels of serum estradiol and activin A and reduced levels of aromatase mRNA in the gonadal tumors. Based on these and our previous genetic analyses, we conclude that elevated FSH levels do not directly cause gonadal tumors. However, these results suggest FSH is an important trophic modifier factor for gonadal tumorigenesis in inhibin-deficient mice.
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Affiliation(s)
- T R Kumar
- Department of Pathology, Baylor College of Medicine, Houston, Texas 77030, USA
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16
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Abstract
Cloned human stromal cell lines representing functionally distinct cellular components of the marrow microenvironment were generated to serve as tools for identifying gene products that regulate hematopoiesis. Oligonucleotide arrays, or "gene chips" were used to provide a comprehensive comparison of gene expression among the cell lines. One line, designated HS-5, was found to secrete large amounts of cytokines, and conditioned media from this line was found to support the ex vivo expansion of both immature and mature progenitors. In contrast, a second line, designated HS-27a, does not secrete known cytokines but does support cobblestone area formation by CD34+/38lo cells. HS-27a, but not HS-5, was also found to express hJagged1, a ligand for Notch1, which may function to influence cell fate decisions of hematopoietic precursors. Both cell lines are currently being used to identify other gene products that regulate hematopoiesis and to generate reagents that will allow more formal evaluation of the putative role of hJagged1 in hematopoietic cell fate decisions.
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Affiliation(s)
- B Torok-Storb
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109-1024, USA.
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17
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Lockhart DJ, Dong H, Byrne MC, Follettie MT, Gallo MV, Chee MS, Mittmann M, Wang C, Kobayashi M, Horton H, Brown EL. Expression monitoring by hybridization to high-density oligonucleotide arrays. Nat Biotechnol 1996; 14:1675-80. [PMID: 9634850 DOI: 10.1038/nbt1296-1675] [Citation(s) in RCA: 2517] [Impact Index Per Article: 89.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The human genome encodes approximately 100,000 different genes, and at least partial sequence information for nearly all will be available soon. Sequence information alone, however, is insufficient for a full understanding of gene function, expression, regulation, and splice-site variation. Because cellular processes are governed by the repertoire of expressed genes, and the levels and timing of expression, it is important to have experimental tools for the direct monitoring of large numbers of mRNAs in parallel. We have developed an approach that is based on hybridization to small, high-density arrays containing tens of thousands of synthetic oligonucleotides. The arrays are designed based on sequence information alone and are synthesized in situ using a combination of photolithography and oligonucleotide chemistry. RNAs present at a frequency of 1:300,000 are unambiguously detected, and detection is quantitative over more than three orders of magnitude. This approach provides a way to use directly the growing body of sequence information for highly parallel experimental investigations. Because of the combinatorial nature of the chemistry and the ability to synthesize small arrays containing hundreds of thousands of specifically chosen oligonucleotides, the method is readily scalable to the simultaneous monitoring of tens of thousands of genes.
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Kuchroo VK, Byrne MC, Greenfield E, Whitters MJ, Nalefsky EA, Rao A, Collins M, Dorf ME. Transfection of TCR alpha-chains into suppressor and T helper cell hybridomas. Production of suppressor factors with predicted antigen specificity. The Journal of Immunology 1995. [DOI: 10.4049/jimmunol.154.10.5030] [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: 12/31/2022]
Abstract
Abstract
Conditioned medium from Ag-specific suppressor T cell hybridomas contains soluble factors (TsF) that modulate immune responses in an Ag-specific manner. We previously generated a series of TCR-alpha- and TCR-beta- expression variants from a 4-hydroxy-3-nitrophenyl acetyl (NP)-specific inducer suppressor T cell hybridoma and demonstrated that loss of TCR alpha-chain mRNA, but not TCR-beta chain mRNA, was accompanied by concomitant loss of suppressor bioactivity. Suppressor factor bioactivity was restored by expression of TCR alpha-chain cDNA, suggesting that the TCR alpha-chain plays a critical role in Ag-specific suppressor cell function. We have now transfected TCR alpha-chain from a Th cell clone specific for arsanylated peptides plus I-Ad into a TCR-alpha- derivative of an NP-specific inducer suppressor T cell hybridoma. The transfectants expressed a new hybrid TCR-alpha beta complex and produced soluble factors that suppressed azobenzenearsonate hapten (ABA) but not NP delayed-type hypersensitivity responses. These supernatants mediated suppression of the induction, but not the effector phase of the delayed-type hypersensitivity reaction. In reciprocal experiments we transfected a TCR alpha-chain from an NP-specific suppressor T cell hybridoma into a TCR-alpha- hybridoma derived from the ABA-specific Th cell hybridoma. The NP-specific TCR alpha-chain was expressed in the Th cell hybridoma, but the supernatant from this transfectant did not suppress DTH responses to either NP or ABA. However, the latter supernatants, when combined with cell lysates derived from a TCR-alpha- Ts hybridoma, specifically suppress NP DTH responses. These data are consistent with the interpretation that TCR alpha-chain imparts Ag specificity to the suppressor molecule and a second, yet undefined, component produced by the Ts hybridoma controls the immunoregulatory bioactivity.
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Affiliation(s)
- V K Kuchroo
- Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - M C Byrne
- Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - E Greenfield
- Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - M J Whitters
- Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - E A Nalefsky
- Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - A Rao
- Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - M Collins
- Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - M E Dorf
- Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
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Kuchroo VK, Byrne MC, Greenfield E, Whitters MJ, Nalefsky EA, Rao A, Collins M, Dorf ME. Transfection of TCR alpha-chains into suppressor and T helper cell hybridomas. Production of suppressor factors with predicted antigen specificity. J Immunol 1995; 154:5030-8. [PMID: 7730610] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Conditioned medium from Ag-specific suppressor T cell hybridomas contains soluble factors (TsF) that modulate immune responses in an Ag-specific manner. We previously generated a series of TCR-alpha- and TCR-beta- expression variants from a 4-hydroxy-3-nitrophenyl acetyl (NP)-specific inducer suppressor T cell hybridoma and demonstrated that loss of TCR alpha-chain mRNA, but not TCR-beta chain mRNA, was accompanied by concomitant loss of suppressor bioactivity. Suppressor factor bioactivity was restored by expression of TCR alpha-chain cDNA, suggesting that the TCR alpha-chain plays a critical role in Ag-specific suppressor cell function. We have now transfected TCR alpha-chain from a Th cell clone specific for arsanylated peptides plus I-Ad into a TCR-alpha- derivative of an NP-specific inducer suppressor T cell hybridoma. The transfectants expressed a new hybrid TCR-alpha beta complex and produced soluble factors that suppressed azobenzenearsonate hapten (ABA) but not NP delayed-type hypersensitivity responses. These supernatants mediated suppression of the induction, but not the effector phase of the delayed-type hypersensitivity reaction. In reciprocal experiments we transfected a TCR alpha-chain from an NP-specific suppressor T cell hybridoma into a TCR-alpha- hybridoma derived from the ABA-specific Th cell hybridoma. The NP-specific TCR alpha-chain was expressed in the Th cell hybridoma, but the supernatant from this transfectant did not suppress DTH responses to either NP or ABA. However, the latter supernatants, when combined with cell lysates derived from a TCR-alpha- Ts hybridoma, specifically suppress NP DTH responses. These data are consistent with the interpretation that TCR alpha-chain imparts Ag specificity to the suppressor molecule and a second, yet undefined, component produced by the Ts hybridoma controls the immunoregulatory bioactivity.
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MESH Headings
- Animals
- Blotting, Northern
- Female
- Flow Cytometry
- Granulocyte-Macrophage Colony-Stimulating Factor/analysis
- Haptens/immunology
- Hybridomas/immunology
- Hypersensitivity, Delayed/immunology
- Interleukin-3/analysis
- Mice
- Mice, Inbred C57BL
- Mice, Inbred Strains
- Nitrophenols/immunology
- Receptors, Antigen, T-Cell, alpha-beta/biosynthesis
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/immunology
- Suppressor Factors, Immunologic/biosynthesis
- Suppressor Factors, Immunologic/immunology
- T-Lymphocytes, Helper-Inducer/immunology
- T-Lymphocytes, Regulatory/immunology
- Transfection/genetics
- p-Azobenzenearsonate/immunology
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Affiliation(s)
- V K Kuchroo
- Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
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20
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O'Hara RM, Byrne MC, Kuchroo VK, Nagelin A, Whitters MJ, Jayaraman S, Henderson SL, Dorf ME, Collins M. T cell receptor alpha-chain defines the antigen specificity of antigen-specific suppressor factor but does not impart genetic restriction. The Journal of Immunology 1995. [DOI: 10.4049/jimmunol.154.5.2075] [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: 01/01/2023]
Abstract
Abstract
Previous studies utilizing NP (4-hydroxy, 3-nitrophenyl acetyl hapten)-specific, T suppressor hybridomas have indicated that expression of TCR-alpha, but not TCR-beta, mRNA is required for expression of Ag-specific suppressor factor bioactivity. Suppressor-effector factor has been shown to be Ag specific and I-J restricted. Although the expression of TCR-alpha mRNA was necessary for suppressor activity, the role of TCR-alpha, as it pertained to the functional properties of T cell suppressor factor (TsF), was not established. To determine which properties of TsF could be accounted for by TCR-alpha expression, TCR-alpha cDNA, derived from NP-specific, suppressor T cell (Ts) hybridomas, was transfected into recipient Ts hybridomas of a second Ag specificity. The resulting heterologous transfectants displayed NP-specific, genetically restricted TsF activity. The Ag specificity corresponded to that of the TCR-alpha donor; however, the genetic restriction was influenced by the recipient cell, implying that TCR-alpha did not control genetic restriction of the TsF. Examination of TCR-beta expression in one of the MHC-restricted transfectants indicated that the genetic restriction of TsF could not be accounted for by TCR-beta gene products. The data support the conclusion that TCR-alpha expression is not only obligate for TsF bioactivity, but that the Ag specificity of the TCR-alpha dictates the Ag specificity of the resulting suppressor factor.
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Affiliation(s)
| | - M C Byrne
- Genetics Institute, Cambridge, MA 02140
| | | | - A Nagelin
- Genetics Institute, Cambridge, MA 02140
| | | | | | | | - M E Dorf
- Genetics Institute, Cambridge, MA 02140
| | - M Collins
- Genetics Institute, Cambridge, MA 02140
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21
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O'Hara RM, Byrne MC, Kuchroo VK, Nagelin A, Whitters MJ, Jayaraman S, Henderson SL, Dorf ME, Collins M. T cell receptor alpha-chain defines the antigen specificity of antigen-specific suppressor factor but does not impart genetic restriction. J Immunol 1995; 154:2075-81. [PMID: 7868884] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Previous studies utilizing NP (4-hydroxy, 3-nitrophenyl acetyl hapten)-specific, T suppressor hybridomas have indicated that expression of TCR-alpha, but not TCR-beta, mRNA is required for expression of Ag-specific suppressor factor bioactivity. Suppressor-effector factor has been shown to be Ag specific and I-J restricted. Although the expression of TCR-alpha mRNA was necessary for suppressor activity, the role of TCR-alpha, as it pertained to the functional properties of T cell suppressor factor (TsF), was not established. To determine which properties of TsF could be accounted for by TCR-alpha expression, TCR-alpha cDNA, derived from NP-specific, suppressor T cell (Ts) hybridomas, was transfected into recipient Ts hybridomas of a second Ag specificity. The resulting heterologous transfectants displayed NP-specific, genetically restricted TsF activity. The Ag specificity corresponded to that of the TCR-alpha donor; however, the genetic restriction was influenced by the recipient cell, implying that TCR-alpha did not control genetic restriction of the TsF. Examination of TCR-beta expression in one of the MHC-restricted transfectants indicated that the genetic restriction of TsF could not be accounted for by TCR-beta gene products. The data support the conclusion that TCR-alpha expression is not only obligate for TsF bioactivity, but that the Ag specificity of the TCR-alpha dictates the Ag specificity of the resulting suppressor factor.
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Byrne MC, O'Hara RM, Kuchroo VK, Jayaraman S, Rao A, Dorf ME, Collins M. The role of the T cell receptor alpha chain in antigen-specific immune suppression. Ann N Y Acad Sci 1993; 685:611-3. [PMID: 8363270 DOI: 10.1111/j.1749-6632.1993.tb35924.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- M C Byrne
- Genetics Institute, Cambridge, Massachusetts 02140
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Kuchroo VK, Byrne MC, Atsumi Y, Greenfield E, Connolly JB, Whitters MJ, O'Hara RM, Collins M, Dorf ME. T-cell receptor alpha chain plays a critical role in antigen-specific suppressor cell function. Proc Natl Acad Sci U S A 1991; 88:8700-4. [PMID: 1833764 PMCID: PMC52577 DOI: 10.1073/pnas.88.19.8700] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [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: 12/29/2022] Open
Abstract
Antigen-specific suppressor T-cell hybridomas release soluble suppressor factors (TsF) in the supernatant that modulate both in vivo delayed-type hypersensitivity and in vitro plaque-forming cell responses in an antigen-specific manner. To study the relationship between the T-cell receptor (TcR) and TsF, we developed a series of TcR alpha- or TcR beta- expression variants from suppressor T-cell hybridomas that expressed the CD3-TcR alpha/beta complex. We demonstrate that loss of TcR alpha but not TcR beta mRNA was accompanied by the concomitant loss of suppressor bioactivity. Homologous transfection of TcR alpha cDNA into a TcR alpha- beta+ clone reconstituted both CD3-TcR expression and suppressor function. Furthermore, suppressor activity from TcR beta- variants was specifically absorbed by antigen and anti-TcR alpha antibodies, but not by anti-CD3 or anti-TcR beta affinity columns. These data directly establish a role for the TcR alpha chain in suppressor T-cell function and suggest that the TcR alpha chain is part of the antigen-specific TsF molecule.
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MESH Headings
- Animals
- Antibody Formation
- Antigens/immunology
- Antigens, Differentiation, T-Lymphocyte/physiology
- Base Sequence
- Blotting, Northern
- CD3 Complex
- DNA/genetics
- Gene Expression
- Hybridomas
- Hypersensitivity, Delayed/immunology
- Mice
- Molecular Sequence Data
- Oligonucleotides/chemistry
- Polymerase Chain Reaction
- RNA, Messenger/genetics
- Receptors, Antigen, T-Cell/physiology
- Receptors, Antigen, T-Cell, alpha-beta/physiology
- Suppressor Factors, Immunologic/immunology
- T-Lymphocytes, Regulatory/immunology
- Transfection
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Affiliation(s)
- V K Kuchroo
- Department of Pathology, Harvard Medical School, Boston MA 02115
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Abstract
Cultured astrocytes prepared from newborn rat brain and 13-day-old chick embryonic brain were analyzed qualitatively and quantitatively for ganglioside content. All preparations contained approximately the same total level: 2.4-3.4 micrograms N-acetylneuraminic acid (NeuAc)/mg protein. In contrast, the value for primary cultures of neurons from chick embryonic brain was 5.9. The non-hexosamine-containing species, GM3 and GD3, comprised 75-85% of the total in astroglial cultures, the remainder consisting mainly of structural types other than the gangliotetraose series; choleragenoid assay revealed the latter to be virtually absent or to comprise at most a few percent. Deficiency of gangliotetraose synthesizing ability was indicated by the very low level of UDP-GalNac:GM3 N-acetylgalactosaminyltransferase detected in the cells. Treatment of cultured astrocytes with astroglial growth factor 2 or dibutyryl cyclic AMP caused little if any change in quantity or pattern of gangliosides. The large majority of cells stained in a manner characteristic of astrocytes: positive for glial fibrillary acidic protein, negative for galactosyl ceramides. Staining with cholera toxin and anti-GM1 antibody was essentially negative, as was that with tetanus toxin, A2B5 monoclonal antibody, and antibody to GD3. All evidence thus points to cultured astrocytes of rat and chick brain containing appreciable gangliosides, most of which are GM3 and GD3 with the majority of the remainder comprising structures other than the gangliotetraose type.
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Affiliation(s)
- M Sbaschnig-Agler
- Department of Neurology, Albert Einstein College of Medicine, Bronx, NY 10461
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Byrne MC, Farooq M, Sbaschnig-Agler M, Norton WT, Ledeen RW. Ganglioside content of astroglia and neurons isolated from maturing rat brain: consideration of the source of astroglial gangliosides. Brain Res 1988; 461:87-97. [PMID: 3147124 DOI: 10.1016/0006-8993(88)90727-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [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: 01/04/2023]
Abstract
Previous biochemical and histochemical studies have failed to clarify the nature or quantity of gangliosides in CNS astrocytes. Using improved methodologies for bulk isolation of both neurons and astrocytes as well as for ganglioside purification, we find significantly higher ganglioside concentration in astrocytes and very similar thin-layer chromatography (TLC) patterns for the two cell types. However, in vivo labeling of glycoconjugates via intracerebral injection of [3H]glucosamine prior to cell isolation revealed a different picture: whereas glycoproteins were well-labeled in both cell types after labeling periods of 1-2 h, gangliosides were appreciably labeled only in neurons. With longer time periods (8-48 h) between injection and sacrifice, there was convergence of specific radioactivity of gangliosides from the two isolated cell preparations. These changes are compared to those observed in synaptosomes and microsomes that were isolated simultaneously. The results suggest limited ganglioside synthetic ability in astrocytes as compared to neurons, a conclusion supported by assay of UDP-galNAc:GM3 N-acetylgalactosaminyltransferase in the isolated cells. Nevertheless, the presence of ganglioside GM1 in a substantial portion of bulk-isolated astrocytes was demonstrated by indirect immunofluorescent detection of cholera toxin binding. Ideas on the reconciliation of these apparently contradictory phenomena, including the possibility of intercellular transfer and/or phagocytosis are discussed.
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Affiliation(s)
- M C Byrne
- Department of Neurology, Albert Einstein College of Medicine, Bronx, NY 10461
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Margolis RU, Ledeen RW, Sbaschnig-Agler M, Byrne MC, Klein RL, Douglas BH, Margolis RK. Complex carbohydrate composition of large dense-cored vesicles from sympathetic nerve. J Neurochem 1987; 49:1839-44. [PMID: 3681300 DOI: 10.1111/j.1471-4159.1987.tb02445.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [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: 01/06/2023]
Abstract
Highly purified noradrenergic, large, dense-cored vesicles were isolated from bovine sympathetic nerve endings by sucrose-D2O density gradient centrifugation. Their concentration of glycoprotein hexosamine and sialic acid was 6.6 and 3.9 mumol/100 mg lipid-free dry weight, respectively, values which are similar to those previously found in bovine chromaffin granules. However, whereas chromaffin granule glycoproteins are characterized by their high proportion of N-acetylgalactosamine-containing O-glycosidically-linked oligosaccharides (present in the chromogranins), such oligosaccharides accounted for only 17% of those in noradrenergic synaptic vesicle glycoproteins. Fractionation of N-3H-acetylated glycopeptides by sequential lectin affinity chromatography demonstrated that approximately two-thirds of the oligosaccharides were of the tri- and tetraantennary complex type, accompanied by 14% biantennary oligosaccharides and 3% high-mannose oligosaccharides. The vesicles had a relatively low concentration of chondroitin sulfate (less than 5% of that in chromaffin granules) but significant amounts of heparan sulfate (0.4 mumol N-acetylglucosamine/100 mg lipid-free dry weight). No hyaluronic acid was detected. The concentration of ganglioside sialic acid in the noradrenergic vesicles was approximately 1 mumol/100 mg lipid-free dry weight, which is significantly higher than that of a crude membrane mixture from which the vesicles were prepared; the ratio of N-acetyl- to N-glycolylneuraminic acid was 0.8. Several molecular species of gangliosides were detected by thin-layer chromatography, but most of these did not exactly comigrate with bovine brain gangliosides. Cholera toxin binding indicated that approximately half or less of the gangliosides belong to the gangliotetraose series.
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Affiliation(s)
- R U Margolis
- Department of Pharmacology, New York University Medical Center, New York 10016
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27
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Lloyd AM, Barnason AR, Rogers SG, Byrne MC, Fraley RT, Horsch RB. Transformation of Arabidopsis thaliana with Agrobacterium tumefaciens. Science 1986; 234:464-6. [PMID: 17792019 DOI: 10.1126/science.234.4775.464] [Citation(s) in RCA: 89] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Transformed Arabidopsis thaliana plants have been produced by a modified leaf disk transformation-regeneration method. Leaf pieces from sterilely grown plants were precultured for 2 days and inoculated with an Agrobacterium tumefaciens strain containing an avirulent Ti (tumor-inducing) plasmid with a chimeric gene encoding hygromycin resistance. After cocultivation for 2 days, the leaf pieces were placed on a medium that selects for hygromycin resistance. Shoots regenerated within 3 months and were excised, rooted, and transferred to soil. Transformation was confirmed by opine production, hygromycin resistance, and DNA blot hybridization of both primary transformants and progeny. This process for producing transgenic Arabidopsis plants should enhance the usefulness of the species for experimental biology.
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Byrne MC, Sbaschnig-Agler M, Aquino DA, Sclafani JR, Ledeen RW. Procedure for isolation of gangliosides in high yield and purity: simultaneous isolation of neutral glycosphingolipids. Anal Biochem 1985; 148:163-73. [PMID: 4037299 DOI: 10.1016/0003-2697(85)90641-4] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
While several methods for ganglioside extraction and isolation have been described, relatively little attention has been given to the effectiveness of separation from peptides, phospholipids, and various low-molecular-weight contaminants. A procedure is described for isolation of gangliosides in high purity and good yield from 1- to 400-mg samples (wet wt). A key step was mild acidification following homogenization, designed to dissociate gangliosides from lipophilic peptides which coextracted into organic solvents. This has proved particularly helpful for myelin and myelin-containing tissues (e.g., white matter, nerve) whose proteins have presented special problems in ganglioside isolation. In this study isolation was effected by consecutive chromatographies on Sephadex LH-20, DEAE-Sephadex, and silica gel following the initial acidification. The method applied to bovine white matter gave tissue concentrations (calculated from yields and radiolabeled tracer recoveries) that were similar to those obtained with three previously described procedures; however, peptide contaminants were an order of magnitude lower. Removal of low-molecular-weight contaminants, including nucleotide sugars, was virtually complete. In addition to ganglioside isolation the method can be used to obtain neutral glycosphingolipids as well. It is believed to have broad applicability to a diversity of tissues.
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Wilson ME, Byrne MC. The influence of reward on comprehension testing of 2-year-old children. J Commun Disord 1984; 17:261-275. [PMID: 6480884 DOI: 10.1016/0021-9924(84)90030-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A procedure was devised in which a reward was hidden under the stimulus picture representing the correct answer to a comprehension task. Both accuracy and test-retest reliability of the responses of 34 2-yr-old children were measured. Eight items tested comprehension of plural allomorphs /s/ and /z/, and eight evaluated the comprehension of word order in reversible subject-verb-object active sentences. The effects of the rewarded search procedure varied, depending on sex and the language structure that was tested. In those cases where the procedure significantly affected responses, the difference was in the direction of improved accuracy and reliability.
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Abstract
Agrobacterium Ti (tumor-inducing) and Ri (root-inducing) plasmids transform dicot plant cells by insertion of a specific plasmid sector called T-DNA (transferred DNA) into host plant nuclear DNA. The mannopine -type Ri plasmid pRi8196 contains four BamHI fragments that encompass core T-DNA. We report Southern hybridization studies that show that these four fragments have no strong homology to octopine-, nopaline-, or agropine -type Ti plasmids. We detected and mapped very weak homology regions, most of which are assignable to opine synthase or opine catabolic functions on the Ti plasmid. We found no homology between Ri T-DNA and the region of Ti T-DNA that encodes tumor morphology functions.
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Abstract
Virulence of Agrobacterium rhizogenes, agent of hairy root disease, is conferred by large plasmids called Ri (root-inducing) plasmids. We have determined the BamHI fragment map of pRi8196, MW 143 Mda, principally by analysis of recombinant plasmids containing overlapping BamHI partial-digest fragments. Clones containing solitary BamHI inserts of remaining unmapped fragments were used to probe a series of Southern-blotted, pRi8196-derived EcoRI, PstI, HindIII, SalI, or SmaI digests. Continguous hybridized bands represented complements of EcoRI, PstI, HindIII, SalI, or SmaI fragments which bridged the unmapped BamHI fragments. We present, in addition, a detailed map of the core T-DNA region with respect to the restriction endonucleases SalI, EcoRI, HpaI, and HindIII.
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Byrne MC, Ledeen RW, Roisen FJ, Yorke G, Sclafani JR. Ganglioside-induced neuritogenesis: verification that gangliosides are the active agents, and comparison of molecular species. J Neurochem 1983; 41:1214-22. [PMID: 6413653 DOI: 10.1111/j.1471-4159.1983.tb00814.x] [Citation(s) in RCA: 125] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Gangliosides were previously reported to induce neuritogenesis in primary neuronal cultures and in some neurally derived cell lines. Because isolated gangliosides usually contain variable quantities of peptides, we investigated the possibility that neurite-stimulating activity could be caused by these contaminants. Ganglioside preparations from bovine brain and other sources were subjected to a three-step purification procedure that eliminated at least 95% of the contaminating peptides. These purified preparations retained their capacity to induce extensive neurite growth in neuro-2A murine neuroblastoma. Proteolytic digestion and a number of additional procedures were used to reduce residual contamination further without loss of activity. Several crude ganglioside samples had negative effects on neurite development until freed of their inhibitory factors, which were derived from the tissue and/or introduced during laboratory operations. This was particularly evident for bovine white matter gangliosides whose activity increased in proportion to peptide removal. When carefully purified, virtually all of 11 different gangliosides tested were highly active, with the possible exception of GM4, which demonstrated only moderate activity in a limited number of tests. All of the neutral glycolipids tested, as well as sulfatides and free sialic acid, were inactive.
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Abstract
The morphopathologic abnormalities characterizing the gangliosidoses, e.g., meganeurites and aberrant secondary neurites with associated dendritic spines and synapses, show pronounced regional variation. Because gangliosides are thought to be the causative agents, we undertook to detect possible variation in concentration or composition that would correlate with those morphologic findings. A gradient in total ganglioside and GM1 concentration was found corresponding to cerebral cortex greater than caudate = thalamus greater than cerebellum, similar to the morphologic gradient. In addition, the fatty acid compositions were variable, the proportion of docosanoate (22:0) following the same gradient. The possibility that these variations in ganglioside content and composition might influence the growth of aberrant neurites and related structures is discussed.
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34
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Byrne MC. Sisters for sale. Australas Nurses J 1982; 11:5-6. [PMID: 6925970] [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: 01/22/2023]
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35
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Abstract
A growth chamber study was designed to interpret differences in CO(2) exchange rate (CER) and leaf diffusive resistance among 4X, 6X, 8X, and 10X ploidy levels of tall fescue (Festuca arundinacea, Schreb). Mesophyll cell size, stomatal density, number of major and minor veins, and bundle cap size of leaf blades were evaluated. Diffusive resistance tended to decrease and CER to increase with increasing ploidy level. Mean stomatal density decreased from 43.6 per square millimeter to 30.6 per square millimeter as ploidy level increased from 4X to 8X. The 10X ploidy level exhibited the highest stomatal density, 47.2 per square millimeter. Major veins decreased from a mean of 14.2 to 10.2, and minor veins increased from a mean of 4.2 to 6.6, per leaf blade as ploidy increased from 4X to 10X. Total number of veins decreased significantly from a mean of 18.4 to 15.7 as ploidy increased from 4X to 8X.Length and width of mesophyll cells tended to increase as ploidy increased from 4X to 8X, but then decreased again at 10X. The number of cells in the bundle cap showed no trend among ploidy levels. Estimated volume of mesophyll cells increased six times between the 4X and the 6X level while chromosome number of nuclear DNA per cell increased only 50%. However, increases in estimated cell volume were proportional to chromosome number as ploidy increased from 6X to 8X. The relationship between cell volume and chromosome number at 10X was intermediate between that at 4X and 6X or 8X.Differences in stomatal density and diffusive resistance did not fully account for the ploidy effect on CER. Further mesophyll cell volume was positively related to CER, a factor contrary to earlier experiments.
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Affiliation(s)
- M C Byrne
- Department of Agronomy, University of Missouri, Columbia, Missouri 65211
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Dasheiff RM, Byrne MC, Patrone V, McNamara JO. Biochemical evidence of decreased muscarinic cholinergic neuronal communication following amygdala-kindled seizures. Brain Res 1981; 206:233-8. [PMID: 7470892 DOI: 10.1016/0006-8993(81)90123-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Byrne MC. Challenge of the 80's--what's in a name? ASHA 1980; 22:981-2. [PMID: 7006621] [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: 01/22/2023]
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Byrne MC, Gottlieb R, McNamara JO. Amygdala kindling induces muscarinic cholinergic receptor declines in a highly specific distribution within the limbic system. Exp Neurol 1980; 69:85-98. [PMID: 7389852 DOI: 10.1016/0014-4886(80)90145-4] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Byrne MC. An interview with . . . Margaret C. Byrne. ASHA 1980; 22:27-30. [PMID: 6986878] [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: 01/22/2023]
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Abstract
Sixty learning-disabled children with a mean age of 7-11 and 60 children in regular classes with a mean age of 7-10 were given a tense marker test to elicit future, present, and past tense markers for 50 verbs organized into 10 categories based on the operation required to form the past tense. Results indicated that both normal and learning-disabled children had achieved control of future, present, and /-d/ and /-t/ past tense markers. Neither group has mastered the /-ed/ nor seven categories of irregular past tense markers. Children in regular classes showed significantly higher correct responses across 10 categories of past tense items. Analysis of error patterns indicated that learning disabled children used a different pattern of responses and a different set of rules to mark past tense. This study shows the need for data on the linguistic status of normally developing children above the age of seven, if we are to make any inferences about the performance of children whose development is deviate.
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Abstract
This study investigated the effect, on conversational speech, of a training task that included correct sound production of words as a subject read a word list at increasing rates of speed. Five children participated in a 10-day program designed to automatize articulation of a target souncf. The /s/ was the target for three children and the /r/ for two. At each training session a subject was required to read a list of 60 words, 25 times. The child was rewarded each time he read the list within a prescribed time period while producing every target sound correctly. Probes of conversational speech were recorded each day in school, at home, and in a third setting at the conclusion of the program. Analyses of these tapes indicated that four of the five children showed varying degrees of carryover. Complete carryover, however, was not achieved. Subjects who made the greatest improvement tended to have the highest number of correct readings, as well as the most rapid readings of the word list. Recordings made in the home, school, and in a third environment reflected similar trends of carryover.
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Abstract
This project studied auditory abilities of a selected group of advanced and retarded third-grade readers from high and low socioeconomic environments. Two general hypotheses were posed: (1) advanced and retarded readers perform differently on auditory tasks; and (2) socioeconomic environment affects auditory ability. A one-hour battery of auditory tests was administered to 39 third-grade children, all of whom were at least one year ahead or one year behind grade level in reading achievement. This research indicated that significant differences existed between advanced and retarded readers on the auditory tasks. Socioeconomic environment, alone, did not affect auditory ability. The advanced readers from both levels performed similarly, and so did the retarded readers. Significant differences were more frequently found when the groups had more widely divergent mean IQ scores.
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Allen EY, Black ME, Burkland M, Byrne MC, Farquhar MS, Herbert EL, Robertson ML. A controversial issue. Case selection in the public schools. J Speech Hear Disord 1966; 31:157-61. [PMID: 5935776 DOI: 10.1044/jshd.3102.157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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