Direct observation and quantification of macrophage chemoattraction to the growth factor CSF-1.

The cloned mouse macrophage cell line, BAC1.25F, resembles primary macrophages in its dependence on colony stimulating factor-1 (CSF-1) for both viability and proliferation. Re-addition of CSF-1 to cytokine-deprived cells, which are rounded with diffusely organised F-actin, stimulates rapid cell spreading and cell polarisation. Using the Dunn chemotaxis chamber the movement of stimulated macrophages was monitored over a 2 hour period. Cells restimulated with 1.32 nM human recombinant CSF-1 migrated at a mean rate of 7.71 microns per hour, but showed no directional preferences. In a linear concentration gradient of CSF-1, cytokine-deprived cells were again stimulated to migrate and the mean rate of cell motility, at 6.88 microns per hour, was not significantly different from that measured in an isotropic environment of CSF-1. However, there was a strong preference for the cells to orientate so that their long axes aligned with the CSF-1 gradient and they migrated preferentially towards the source of CSF-1. Migrating cells contained abundant F-actin within the leading lamellae as judged by confocal imaging of fluorescent phalloidin, but the actin was not arranged into stress fibre-like structures. These data support the proposition that CSF-1 is both a chemokinetic and chemotactic agent for macrophages. Tumour necrosis factor (TNF-alpha) failed to stimulate cell migration and thus was neither chemokinetic nor a chemotactic agent. However, cells exposed to a dual concentration gradient of both TNF-alpha and CSF-1 did migrate successfully, although the chemotactic response to CSF-1 was abolished.

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