WASP deficiency produces aberrant F-actin distribution, increased adhesion and downregulation of CD43 during megakaryocytic differentiation. WASP deficiency.

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WASP deficiency produces aberrant F-actin distribution, increased adhesion and downregulation of CD43 during megakaryocytic differentiation. WASP deficiency produces aberrant F-actin distribution, increased adhesion and downregulation of CD43 during megakaryocytic differentiation. (A) Aberrant F-actin localization in WASP-deficient K562 cells. Wild-type (WT) and K562WASPKO clones (Hm1, Hm2) were cultured at 2×105 cells/ml into chamber slides and stimulated with 30 nM of PMA for 96 hours. The cells were stained with rhodamine-phalloidin to visualize F-actin filaments. Arrows indicate F-actin protrusions. Pictures were acquired using the EVOS fluorescence microscope at 40×. (B) Altered F-actin polymerization in WASP-deficient K562 cells. Wild-type K562 (WT) and K562WASPKO (Hm1) cells were stained with rhodamine-phalloidin and analyzed by flow cytometry before and 96 hours after PMA stimulation. Left graph shows mean fluorescence intensity of wild-type K562 and K562WASPKO cells before and after PMA treatment as indicated. Right graph shows the increase in polymerized actin in wild-type K562 and K562WASPKO cells after PMA treatment. (C) K562WASPKO cells (Hm1 and Hm2) have increased unspecific adhesion. Adhesion of PMA-stimulated cells was evaluated by the RT-CES system. WT, Hm1 and Hm2 clones (5×104 cells) were plated into untreated 16-well plates, stimulated with PMA (30 nM) and cell adhesion was measured over 96 hours. The graph shows the cell index over time as a measure of the adhesiveness of the cells. (D) PMA-stimulated K562WASPKO cells have increased adhesion to fibrinogen-coated plates. WT, Hm1 and Hm2 cells (5×104) were stimulated for 96 hours with PMA and then plated onto fibrinogen-coated RT-CES plates. Cell index was monitored over 17 hours as for C. (E) PMA-stimulated and ADP-activated K562WASPKO cells have increased adhesion to fibrinogen-coated plates. WT, Hm1 and Hm2 cells (5×104) were stimulated for 96 hours with PMA, activated with ADP (50 μM, added at the time of plating), plated onto fibrinogen-coated RT-CES plates and the cell index monitored for 17 hours. (F) Minimal response of K562 (WT) and K562WASKO (Hm1 and Hm2) cells to ADP. The graph shows the increment in fibrinogen binding after addition of ADP. (G) K562WASPKO cells have decreased levels of surface CD43. Histograms show mean fluorescence intensity (MFI) of CD43 staining in PMA-stimulated cells (96 hours) (top). The graph shows the ratio between the MFI of CD43 in Hm1 and Hm2 clones related to wild-type cells. Data represent mean ± s.d. for three independent experiments; *P<0.05. Miguel G. Toscano et al. Dis. Model. Mech. 2013;6:544-554 © 2013. Published by The Company of Biologists Ltd