Data Mining Practical Machine Learning Tools and Techniques

https://www.cell.com/trends/cell-biology/pdf/0962-8924(92)90174-L.pdf

The small GTP-binding protein rho regulates the assembly of focal adhesions and actin stress fibers in response to growth factors.

### A. Overview

Extracellular purines (adenosine, ADP, and ATP) and pyrimidines (UDP and UTP) are important signaling molecules that mediate diverse biological effects via cell-surface receptors termed purine receptors. In this review particular emphasis is placed on the discrepancy between the

/pdf/receptors-for-purines-and-pyrimidines-56f78tnpew.pdf

Receptors for Purines and Pyrimidines

25. Multiple Imputation for Nonresponse in Surveys. By D. B. Rubin. ISBN 0 471 08705 X. Wiley, Chichester, 1987. 258 pp. £30.25.

Multiple Imputation for Nonresponse in Surveys

Regulatory T (T(Reg)) cells are essential for maintaining peripheral tolerance, preventing autoimmune diseases and limiting chronic inflammatory diseases. However, they also limit beneficial responses by suppressing sterilizing immunity and limiting antitumour immunity. Given that T(Reg) cells can have both beneficial and deleterious effects, there is considerable interest in determining their mechanisms of action. In this Review, we describe the basic mechanisms used by T(Reg) cells to mediate suppression and discuss whether one or many of these mechanisms are likely to be crucial for T(Reg)-cell function. In addition, we propose the hypothesis that effector T cells may not be 'innocent' parties in this suppressive process and might in fact potentiate T(Reg)-cell function.

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How regulatory T cells work.

Phagocytosis and innate immunity.

BACKGROUND:Incomplete recovery of neuromuscular function may impair pulmonary and upper airway function and contribute to adverse respiratory events in the postanesthesia care unit (PACU). The aim of this investigation was to assess and quantify the severity of neuromuscular blockade in patients wit

Residual neuromuscular blockade and critical respiratory events in the postanesthesia care unit

Lymphocyte activation gene-3 (LAG-3) is a CD4-related transmembrane protein expressed by regulatory T cells that binds MHC II on APCs. It is shown in this study that during Treg:DC interactions, LAG-3 engagement with MHC class II inhibits DC activation. MHC II cross-linking by agonistic Abs induces an ITAM-mediated inhibitory signaling pathway, involving FcγRγ and ERK-mediated recruitment of SHP-1 that suppresses dendritic cell maturation and immunostimulatory capacity. These data reveal a novel ITAM-mediated inhibitory signaling pathway in DCs triggered by MHC II engagement of LAG-3, providing a molecular mechanism in which regulatory T cells may suppress via modulating DC function.

Regulatory T Cells Inhibit Dendritic Cells by Lymphocyte Activation Gene-3 Engagement of MHC Class II

Specific pathways linking heterotrimeric G proteins and Fc γ receptors to the actin-based cytoskeleton are poorly understood. To test a requirement for Rho family members in cytoskeletal events mediated by structurally diverse receptors in leukocytes, we transfected the full-length human chemotactic peptide receptor in RAW 264.7 cells and examined cytoskeletal alterations in response to the chemotactic peptide formyl-methionyl-leucyl-phenylalanine (FMLP), colony stimulating factor–1 (CSF-1), IgG-coated particles, and phorbol 12-myristate 13-acetate (PMA). Expression of Rac1 N17, Cdc42 N17, or the GAP domain of n -chimaerin inhibited cytoskeletal responses to FMLP and CSF-1, and blocked phagocytosis. Accumulation of F-actin– rich “phagocytic cups” was partially inhibited by expression of Rac1 N17 or Cdc42 N17. In contrast, PMA-induced ruffling was not inhibited by expression of Rac1 N17, but was blocked by expression of Cdc42 N17, indicating that cytoskeletal inhibition by these constructs was nonoverlapping. These results demonstrate differential requirements for Rho family GTPases in leukocyte motility, and indicate that both Rac1 and Cdc42 are required for Fc γ receptor– mediated phagocytosis and for membrane ruffling mediated by structurally distinct receptors in macrophages.

/pdf/requirements-for-both-rac1-and-cdc42-in-membrane-ruffling-30qtqbfz5m.pdf

Steven Greenberg

Papers

Phagocytosis and innate immunity.

Residual neuromuscular blockade and critical respiratory events in the postanesthesia care unit

Regulatory T Cells Inhibit Dendritic Cells by Lymphocyte Activation Gene-3 Engagement of MHC Class II

Requirements for Both Rac1 and Cdc42 in Membrane Ruffling and Phagocytosis in Leukocytes

A Requirement for Phosphatidylinositol 3-Kinase in Pseudopod Extension