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Full-Text Articles in Medicine and Health Sciences
Comparison Of Cytotoxic Properties Of Neonatal And Adult Neutrophils And Monocytes And Enhancement By Cytokines., E . R. Stiehm, R. L. Roberts, B. J. Ank, S. Plaeger-Marshall, N. Salman, L. Shen, M. W. Fanger
Comparison Of Cytotoxic Properties Of Neonatal And Adult Neutrophils And Monocytes And Enhancement By Cytokines., E . R. Stiehm, R. L. Roberts, B. J. Ank, S. Plaeger-Marshall, N. Salman, L. Shen, M. W. Fanger
Dartmouth Scholarship
We studied cytotoxic capabilities of newborn polymorphonuclear leukocytes (PMNs) and monocytes and their enhancement by cytokines and antibodies. Umbilical cord PMNs were assessed for their ability to kill various target cells spontaneously, after activation with phorbol myristate acetate, in the presence of antiserum (antibody-dependent cellular cytotoxicity), and in the presence of dually specific antibody (heteroantibody-mediated cytotoxicity). Target cells included the K562 cell line (natural killer cell target), chicken erythrocytes (CRBCs), and herpes simplex virus-infected CEM cell lines. Newborn PMNs were equivalent to adult PMNs in their cytotoxic capacity in several cytotoxicity assays. Neither adult nor newborn PMNs lyse tumor cell …
Camp Antagonizes Interleukin 2-Promoted T-Cell Cycle Progression At A Discrete Point In Early G1., Kirk W. Johnson, Bruce H. Davis, Kendall A. Smith
Camp Antagonizes Interleukin 2-Promoted T-Cell Cycle Progression At A Discrete Point In Early G1., Kirk W. Johnson, Bruce H. Davis, Kendall A. Smith
Dartmouth Scholarship
T lymphocytes are stimulated to proliferate in an autocrine/paracrine manner by the lymphokine interleukin 2 (IL-2). In seeking further insight into the mechanisms by which IL-2 induces progression of T cells through the G1 phase of the cell cycle, studies were performed with agents that increase cellular adenosine 3',5'-cyclic monophosphate (cAMP), a well-known inhibitor of lymphocyte growth. The addition of dibutyryl-cAMP, cholera toxin, forskolin, or 3-isobutyl-1-methylxanthine to an IL-2-dependent murine T-cell line evoked a dose-related suppression of S-phase transition without affecting cellular viability. Moreover, elevation of cAMP levels led to an accumulation of uniformly small cells, suggesting an arrest in …
Rat Dendritic Cells Function As Accessory Cells And Control The Production Of A Soluble Factor Required For Mitogenic Responses Of T Lymphocytes., Wolfgang E. Klinkert, Jon H. Labadie, James P. O'Brien, Carl F. Beyer, William E. Bowers
Rat Dendritic Cells Function As Accessory Cells And Control The Production Of A Soluble Factor Required For Mitogenic Responses Of T Lymphocytes., Wolfgang E. Klinkert, Jon H. Labadie, James P. O'Brien, Carl F. Beyer, William E. Bowers
Dartmouth Scholarship
Transformation of T lymphocytes, induced by treatment with periodate or with neuraminidase plus galactose oxidase, requires the participation of accessory cells. Procedures were developed for the fractionation of rat lymph node cells, by which most of the lymphocytes can be recovered as a major population of cells that do not respond to mitogenic stimulation unless accessory cells from a separated minor population are added. Further purification led to a 1000-fold overall increase in accessory activity per cell, with a 50-70% yield. The purest preparations were virtually free of macrophages and contained more than 90% typical dendritic cells. Maximum responses occurred …