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J Biol Chem. Author manuscript; available in PMC 2012 November 22.
Published in final edited form as:
J Biol Chem. 2006 February 24; 281(8): 4663–4670.
Published online 2005 December 22. doi: 10.1074/jbc.M508342200


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Apoptotic cells inhibit whereas necrotic cells activate p90Rsk, a downstream substrate of ERK1/2, in BM macrophages

Serum-starved BM macrophages were stimulated with increasing numbers of apoptotic cells, necrotic cells, or latex beads alone for 15 min (A) or stimulated with M-CSF for 15 min following a 30-min pre-exposure to apoptotic cells, necrotic cells, or latex beads (B). Apoptotic or necrotic BUMPT cells were added to macrophages at a cell to macrophage ratio ranging from 1:64 to 1:1 in 2-fold increments, as indicated by the schematic diagram of increasing cell ratio. Non-adherent cells were removed by rinsing, and macrophage lysates were probed with anti-active phospho-p90Rsk antibody. Equal loading was confirmed by Ponceau S staining of blotted proteins as well as probing for total p90Rsk (supplemental Fig. S2). Apo-ptotic and necrotic cells alone contributed no active p90Rsk in these experiments.

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