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  • 1
    Publication Date: 1999-01-15
    Description: Phosphoinositide 3-kinase (PI3K) activation has been implicated in many cellular responses, including fibroblast growth, transformation, survival, and chemotaxis. Although PI3K is activated by several agents that stimulate T and B cells, the role of PI3K in lymphocyte function is not clear. The mouse gene encoding the PI3K adapter subunit p85alpha and its splice variants p55alpha and p50alpha was disrupted. Most p85alpha-p55alpha-p50alpha-/- mice die within days after birth. Lymphocyte development and function was studied with the use of the RAG2-deficient blastocyst complementation system. Chimeric mice had reduced numbers of peripheral mature B cells and decreased serum immunoglobulin. The B cells that developed had diminished proliferative responses to antibody to immunoglobulin M, antibody to CD40, and lipopolysaccharide stimulation and decreased survival after incubation with interleukin-4. In contrast, T cell development and proliferation was normal. This phenotype is similar to defects observed in mice lacking the tyrosine kinase Btk.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fruman, D A -- Snapper, S B -- Yballe, C M -- Davidson, L -- Yu, J Y -- Alt, F W -- Cantley, L C -- R01 GM041890/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Jan 15;283(5400):393-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Signal Transduction, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA. dfruman@bidmc.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9888855" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD45/analysis ; Apoptosis ; B-Lymphocytes/cytology/enzymology/*immunology ; Catalytic Domain ; Cell Cycle ; Chimera ; Chromones/pharmacology ; Enzyme Inhibitors/pharmacology ; Female ; Gene Targeting ; Immunoglobulins/*blood ; *Lymphocyte Activation ; Lymphocyte Count ; Male ; Mice ; Mice, Inbred C57BL ; Morpholines/pharmacology ; Phosphatidylinositol 3-Kinases/antagonists & inhibitors/genetics/*metabolism ; Protein-Tyrosine Kinases/genetics/metabolism ; Spleen/immunology ; T-Lymphocytes/cytology/enzymology/immunology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2014-04-11
    Description: The mechanisms by which mucosal homeostasis is maintained are of central importance to inflammatory bowel disease. Critical to these processes is the intestinal epithelial cell (IEC), which regulates immune responses at the interface between the commensal microbiota and the host. CD1d presents self and microbial lipid antigens to natural killer T (NKT) cells, which are involved in the pathogenesis of colitis in animal models and human inflammatory bowel disease. As CD1d crosslinking on model IECs results in the production of the important regulatory cytokine interleukin (IL)-10 (ref. 9), decreased epithelial CD1d expression--as observed in inflammatory bowel disease--may contribute substantially to intestinal inflammation. Here we show in mice that whereas bone-marrow-derived CD1d signals contribute to NKT-cell-mediated intestinal inflammation, engagement of epithelial CD1d elicits protective effects through the activation of STAT3 and STAT3-dependent transcription of IL-10, heat shock protein 110 (HSP110; also known as HSP105), and CD1d itself. All of these epithelial elements are critically involved in controlling CD1d-mediated intestinal inflammation. This is demonstrated by severe NKT-cell-mediated colitis upon IEC-specific deletion of IL-10, CD1d, and its critical regulator microsomal triglyceride transfer protein (MTP), as well as deletion of HSP110 in the radioresistant compartment. Our studies thus uncover a novel pathway of IEC-dependent regulation of mucosal homeostasis and highlight a critical role of IL-10 in the intestinal epithelium, with broad implications for diseases such as inflammatory bowel disease.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4132962/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4132962/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Olszak, Torsten -- Neves, Joana F -- Dowds, C Marie -- Baker, Kristi -- Glickman, Jonathan -- Davidson, Nicholas O -- Lin, Chyuan-Sheng -- Jobin, Christian -- Brand, Stephan -- Sotlar, Karl -- Wada, Koichiro -- Katayama, Kazufumi -- Nakajima, Atsushi -- Mizuguchi, Hiroyuki -- Kawasaki, Kunito -- Nagata, Kazuhiro -- Muller, Werner -- Snapper, Scott B -- Schreiber, Stefan -- Kaser, Arthur -- Zeissig, Sebastian -- Blumberg, Richard S -- 260961/European Research Council/International -- AI50950/AI/NIAID NIH HHS/ -- DK0034854/DK/NIDDK NIH HHS/ -- DK034854/DK/NIDDK NIH HHS/ -- DK044319/DK/NIDDK NIH HHS/ -- DK051362/DK/NIDDK NIH HHS/ -- DK053056/DK/NIDDK NIH HHS/ -- DK088199/DK/NIDDK NIH HHS/ -- DK56260/DK/NIDDK NIH HHS/ -- HL38180/HL/NHLBI NIH HHS/ -- HL59561/HL/NHLBI NIH HHS/ -- P30 DK034854/DK/NIDDK NIH HHS/ -- P30 DK052574/DK/NIDDK NIH HHS/ -- P30CA013696/CA/NCI NIH HHS/ -- P30DK52574/DK/NIDDK NIH HHS/ -- R01 DK044319/DK/NIDDK NIH HHS/ -- England -- Nature. 2014 May 22;509(7501):497-502. doi: 10.1038/nature13150. Epub 2014 Apr 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Division of Gastroenterology, Hepatology, and Endoscopy, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA [2]. ; 1] Department of Internal Medicine I, University Medical Center Schleswig-Holstein, 24105 Kiel, Germany [2]. ; Division of Gastroenterology, Hepatology, and Endoscopy, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA. ; GI Pathology, Miraca Life Sciences, Newton, Massachusetts 02464, USA. ; Division of Gastroenterology, Washington University School of Medicine, St Louis, Missouri 63110, USA. ; Herbert Irving Comprehensive Cancer Center, Columbia University, New York, New York 10032, USA. ; Department of Medicine, Department of Infectious Diseases & Pathology, University of Florida, Gainesville, Florida 32611, USA. ; Department of Medicine II-Grosshadern, Ludwig Maximilians University, Munich 81377, Germany. ; Institute of Pathology, Ludwig Maximilians University, Munich 80337, Germany. ; Department of Pharmacology, Graduate School of Dentistry, Osaka University, Osaka 565-0871, Japan. ; Gastroenterology Division, Yokohama City University School of Medicine, Yokohama, Kanagawa 236-0027, Japan. ; Laboratory of Biochemistry and Molecular Biology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka 565-0871, Japan. ; Department of Molecular Biosciences, Faculty of Life Sciences, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto 603-8555, Japan. ; Faculty of Life Sciences, University of Manchester, Manchester M13 9PL, UK. ; 1] Division of Gastroenterology, Hepatology, and Endoscopy, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA [2] Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Department of Medicine, Children's Hospital Boston, Boston, Massachusetts 02115, USA. ; Department of Internal Medicine I, University Medical Center Schleswig-Holstein, 24105 Kiel, Germany. ; Division of Gastroenterology, Addenbrooke Hospital, University of Cambridge, Cambridge CB2 0QQ, UK. ; 1] Division of Gastroenterology, Hepatology, and Endoscopy, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA [2] Department of Internal Medicine I, University Medical Center Schleswig-Holstein, 24105 Kiel, Germany [3].〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24717441" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD1d/*immunology ; Carrier Proteins/metabolism ; Colitis/immunology/pathology ; Disease Models, Animal ; Epithelial Cells/*immunology/metabolism ; Female ; HSP110 Heat-Shock Proteins/genetics/metabolism ; Humans ; Immunity, Mucosal/*immunology ; Inflammation/immunology/pathology ; Inflammatory Bowel Diseases/immunology/pathology ; Interleukin-10/genetics/*immunology ; Intestinal Mucosa/*cytology/*immunology ; Male ; Mice ; Natural Killer T-Cells/immunology/metabolism ; Oxazolone ; STAT3 Transcription Factor/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2015-08-15
    Description: T regulatory cells that express the transcription factor Foxp3 (Foxp3(+) T(regs)) promote tissue homeostasis in several settings. We now report that symbiotic members of the human gut microbiota induce a distinct T(reg) population in the mouse colon, which constrains immuno-inflammatory responses. This induction-which we find to map to a broad, but specific, array of individual bacterial species-requires the transcription factor Rorgamma, paradoxically, in that Rorgamma is thought to antagonize FoxP3 and to promote T helper 17 (T(H)17) cell differentiation. Rorgamma's transcriptional footprint differs in colonic T(regs) and T(H)17 cells and controls important effector molecules. Rorgamma, and the T(regs) that express it, contribute substantially to regulating colonic T(H)1/T(H)17 inflammation. Thus, the marked context-specificity of Rorgamma results in very different outcomes even in closely related cell types.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4700932/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4700932/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sefik, Esen -- Geva-Zatorsky, Naama -- Oh, Sungwhan -- Konnikova, Liza -- Zemmour, David -- McGuire, Abigail Manson -- Burzyn, Dalia -- Ortiz-Lopez, Adriana -- Lobera, Mercedes -- Yang, Jianfei -- Ghosh, Shomir -- Earl, Ashlee -- Snapper, Scott B -- Jupp, Ray -- Kasper, Dennis -- Mathis, Diane -- Benoist, Christophe -- R01 AI110630/AI/NIAID NIH HHS/ -- R01-AI51530/AI/NIAID NIH HHS/ -- R37 AI051530/AI/NIAID NIH HHS/ -- R56 AI110630/AI/NIAID NIH HHS/ -- R56-AI110630/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2015 Aug 28;349(6251):993-7. doi: 10.1126/science.aaa9420. Epub 2015 Aug 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Immunology, Department of Microbiology and Immunobiology, Harvard Medical School, Boston 02115, MA, USA. ; Division of Gastroenterology and Hepatology, Brigham and Women's Hospital, Boston, MA 02115, USA, and Department of Medicine, Harvard Medical School, Boston, MA 02115, USA. ; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA. ; Tempero Pharmaceuticals, a GSK Company, Cambridge, MA 02115, USA. ; UCB Pharma, Slough, Berkshire, UK. ; Division of Immunology, Department of Microbiology and Immunobiology, Harvard Medical School, Boston 02115, MA, USA. Evergrande Center for Immunologic Diseases, Harvard Medical School and Brigham and Women's Hospital, Boston, MA 02115, USA. cbdm@hms.harvard.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26272906" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacteria/immunology ; Bacteroidetes/immunology/physiology ; Colitis, Ulcerative/immunology ; Colon/*immunology/microbiology ; Forkhead Transcription Factors/analysis/metabolism ; Homeostasis ; Humans ; *Immunity, Mucosal ; Intestinal Mucosa/*immunology/microbiology ; Mice, Inbred C57BL ; Microbiota/*immunology/physiology ; Nuclear Receptor Subfamily 1, Group F, Member 3/genetics/*metabolism ; Symbiosis ; T-Lymphocyte Subsets/immunology ; T-Lymphocytes, Regulatory/*immunology ; Th17 Cells/immunology ; Transcription, Genetic ; Transcriptome
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 4 (1990), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Recent development of vectors and methodologies to introduce recombinant DNA into members of the genus Mycobacterium has provided new approaches for investigating these important bacteria. While most pathogenic mycobacteria are slow-growing, Mycobacterium smegmatis is a fast-growing, non-pathogenic species that has been used for many years as a host for mycobacteriophage propagation and, recently, as a host for the introduction of recombinant DNA. Its use as a cloning host for the analysis of mycobacterial genes has been limited by its inability to be efficiently transformed with plasmid vectors. This work describes the isolation and characterization of mutants of M. smegmatis that can be transformed, using electroporation, at efficiencies 104 to 105 times greater than those of the parent strain, yielding more than 105 transformants per μg of plasmid DNA. The mutations conferring this efficient plasmid transformation (Ept) phenotype do not affect phage transfection or the integration of DNA into the M. smegmatis chromosome, but seem to be specific for plasmid transformation. Such Ept mutants have been used to characterize plasmid DNA sequences essential for replication of the Mycobacterium fortuitum plasmid pAL5000 in mycobacteria by permitting the transformation of a library of hybrid plasmid constructs. Efficient plasmid transformation of M. smegmatis will facilitate the analysis of mycobacterial gene function, expression and replication and thus aid in the development of BCG as a multivalent recombinant vaccine vector and in the genetic analysis of the virulence determinants of pathogenic mycobacteria.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BCG, a live attenuated tubercle bacillus, is the most widely used vaccine in the world and is also a useful vaccine vehicle for delivering protective antigens of multiple pathogens. Extrachromosomal and integrative expression vectors carrying the regulatory sequences for major BCG heat-shock ...
    Type of Medium: Electronic Resource
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  • 6
  • 7
    Publication Date: 2005-09-30
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 8
    Publication Date: 1988-09-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 9
    Publication Date: 2012-06-26
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 10
    Publication Date: 2012-07-11
    Description: A fundamental aspect of skeletal myogenesis involves extensive rounds of cell fusion, in which individual myoblasts are incorporated into growing muscle fibers. Here we demonstrate that N-WASp, a ubiquitous nucleation-promoting factor of branched microfilament arrays, is an essential contributor to skeletal muscle-cell fusion in developing mouse embryos. Analysis both in vivo and in primary satellite-cell cultures, shows that disruption of N-WASp function does not interfere with the program of skeletal myogenic differentiation, and does not affect myoblast motility, morphogenesis and attachment capacity. N-WASp–deficient myoblasts, however, fail to fuse. Furthermore, our analysis suggests that myoblast fusion requires N-WASp activity in both partners of a fusing myoblast pair. These findings reveal a specific role for N-WASp during mammalian myogenesis. WASp-family elements appear therefore to act as universal mediators of the myogenic cell-cell fusion mechanism underlying formation of functional muscle fibers, in both vertebrate and invertebrate species.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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