Mactinin-induced monocyte migration is blocked by Hsp90 Inhibitors. Monocytes were incubated with medium alone or with one of 3 Hsp90 inhibitors (G: geldanamycin; A: 17-AAG; D: 17-DMAG), prior to testing for mactinin-induced or fmpl-induced (control) chemotaxis. In the absence of mactinin or fmlp, 1302 +/- 122 cells migrated (not shown). Mactinin-induced migration was significantly inhibited by each of the Hsp90 inhibitors, whereas fmlp-induced migration was not. Data is shown as the mean +/- SEM. N = 3. Significance of differences in migration in the presence vs absence of Hsp90 inhibitors: *P < 0.01.