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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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