The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 184, 1101-1109, Copyright © 1996 by Rockefeller University Press


ARTICLES

A highly efficacious lymphocyte chemoattractant, stromal cell-derived factor 1 (SDF-1)

CC Bleul, RC Fuhlbrigge, JM Casasnovas, A Aiuti and TA Springer
The Center for Blood Research, Harvard Medical School, Department of Pathology, Boston, Massachusetts 02115, USA.

Chemotactic factors are postulated to direct emigration of lymphocytes from the blood stream into sites of inflammation. Members of a family of chemotactic cytokines, termed chemokines, have been shown to attract lymphocytes but efficacy, i.e., the maximal percentage of attracted cells, has been low. We have identified a highly efficacious lymphocyte chemotactic activity in the supernatants of the murine bone marrow stroma cell line MS-5 which attracts 10-fold more lymphocytes in vitro than currently described lymphocyte chemoattractants. Purification of this chemotactic activity revealed identity to stromal cell-derived factor 1 (SDF-1). SDF-1 acts on lymphocytes and monocytes but not neutrophils in vitro and is both a highly efficacious and highly potent mononuclear cell attractant in vivo. In addition, SDF-1 induces intracellular actin polymerization in lymphocytes, a process that is thought to be a prerequisite for cell motility. Since SDF-1 is expressed constitutively in a broad range of tissues it may have a role in immune surveillance and in basal extravasation of lymphocytes and monocytes rather than in inflammation.
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