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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

LSP1 modulates leukocyte populations in resting and inflamed peritoneum.

Lymphocyte-specific protein 1, recently renamed leukocyte-specific protein 1 ( LSP1), is an F-actin binding protein expressed in lymphocytes, macrophages, and neutrophils in mice and humans. This study examines LSP1-deficient ( Lsp1(-/-)) mice for the development of myeloid and lymphocytic cell populations and their response to the development of peritonitis induced by thioglycollate (TG) and to a T-dependent antigen. Lsp1(-/-) mice exhibit significantly higher levels of resident macrophages in the peritoneum compared to wild-type (wt) mice, whereas the development of myeloid cells is normal. This increase, which is specific for conventional CD5(-) macrophages appears to be tissue specific and does not result from differences in adhesion to the peritoneal mesothelium. The level of peritoneal lymphocytes is decreased in Lsp1(-/-) mice without affecting a particular lymphocytic subset. The proportions of precursor and mature lymphocytes in the central and peripheral tissues of Lsp1(-/-) mice are similar to those of wt mice and Lsp1(-/-) mice mount a normal response to the T-dependent antigen, ovalbumin ( OVA). On injection of TG, the Lsp1(-/-) mice exhibit an accelerated kinetics of changes in peritoneal macrophage and neutrophil numbers as compared to wt including increased influx of these cells. LSP1(-) neutrophils demonstrate an enhanced chemotactic response in vitro to N-formyl methionyl-leucyl-phenylalanine (FMLP) and to the C-X-C chemokine, KC, indicating that their enhanced influx into the peritoneum may be a result of increased motility. Our data demonstrate that LSP1 is a negative regulator of neutrophil chemotaxis. (Blood. 2000;96:1827-1835)[1]


  1. LSP1 modulates leukocyte populations in resting and inflamed peritoneum. Jongstra-Bilen, J., Misener, V.L., Wang, C., Ginzberg, H., Auerbach, A., Joyner, A.L., Downey, G.P., Jongstra, J. Blood (2000) [Pubmed]
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