Dynamics of actin-binding proteins in the ICAM-1 complex.

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Volume 24, Issue 12, Pages (September 2018)

Presentation transcript:

Dynamics of actin-binding proteins in the ICAM-1 complex. Dynamics of actin-binding proteins in the ICAM-1 complex. (A) α-actinin-4–GFP in TNFα-treated HUVEC is recruited to an adherent and transmigrating human neutrophil. Images are stills from a representative live-cell imaging experiment (n = 4). The neutrophil (dotted line in GFP images) transmigrates after 85 s (supplementary material Movie 3). Note that this experiment was performed using a monolayer of endothelial cells: the cell in the left portion of the images did not express α-actinin-4–GFP. (B) Upon addition of anti-ICAM-1 beads (DIC image) to TNFα-treated HUVECs transfected with ICAM-1–GFP or the indicated GFP-tagged adaptor, recruitment of fusion proteins was recorded for 25 min. Still images are shown for α-actinin-4–GFP (supplementary material Movie 4). Quantification (lower left panel) is shown for recruitment of ICAM-1–GFP (n = 3), filamin-B–GFP (n = 3), α-actinin-4–GFP (n = 4), cortactin–GFP (n = 5) and GFP alone (n = 3, t = 0 s is when beads were added). Recruitment at t = 500 s is shown in the bar graph (lower right panel). (C) Mobility of GFP-tagged adaptors and ICAM-1–GFP was analysed by FRAP following the recruitment to anti-ICAM-1 beads. Still images show bleaching (see insets) and recovery of α-actinin-4–GFP. Recovery curves (lower left panel) and bar graph (lower right panel) of the mobile fraction, based on the GFP signal after 40–50 s following bleaching (α-actinin-4–GFP, n = 4; cortactin–GFP, n = 3; filamin-B-GFP, n = 5; ICAM-1–GFP, n = 4). Each independent experiment is an average of two or three cells with one or two rings per cell. Data are mean±s.e.m. ns, not significant, *P<0.05; **P<0.01, ***P<0.001 (Student's t-test). The asterisk in B and C indicates the bead position. Scale bars: 5 µm (A); 10 µm (B,C). Antje Schaefer et al. J Cell Sci 2014;127:4470-4482 © 2014. Published by The Company of Biologists Ltd