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Review
REVIEW] Cell Migration: Regulation of Cytoskeleton by Rap1 in Dictyostelium discoideum
Mi-Rae Lee , Taeck J. Jeon
J. Microbiol. 2012;50(4):555-561.   Published online August 25, 2012
DOI: https://doi.org/10.1007/s12275-012-2246-7
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AbstractAbstract
Cell movement involves a coordinated regulation of the cytoskeleton, F-actin-mediated protrusions at the front and myosin-mediated contraction of the posterior of a cell. The small GTPase Rap1 functions as a key regulator in the spatial and temporal control of cytoskeleton reorganization for cell migration. This review outlines the establishment of cell polarity by differential localizations of the cytoskeleton and discusses the spatial and temporal regulation of cytoskeleton
reorganization via the Rap1 signaling pathway during chemotaxis with a focus on recent advances in the study of chemotaxis using a simple eukaryotic model organism, Dictyostelium discoideum.

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Independent regulation of antigen processing and presentation on induction of antibody responses to various bacterial antigens in C3H/He mice
Kim, Hyung Su , Jeong, Ga Jin
J. Microbiol. 1995;33(4):355-362.
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AbstractAbstract
Induction of antibody production in C3H/He mice by bacterial infection is regulated through the processing exerted by antigen presenting cells. From the studies with Psudomonas aeruginosa, Salmonella typhimurium, and Micrococcus luteu, lipopolysaccharides (LPS) in Gram negative bacteria, which are known to be T-cell independent B cell mitogen, seem to be the major factor stimulating immune responses via activation of macrophages. Activation of macrophage, however, does not seem to correlate with antibody production. M. luteus was easily eliminatd by activated macrophages, while the processed antigens were immediately releasedd into culture medium before presentation. Nevertheless, antigens from Gram positive bacteria, Staphylococcus aureus and Bacillus subtilis, were very very active in chemotaxis and activation of periotoneal macrophages as well as in antien presnetation, while the very nature of the antigens is not yet clearly understood.

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