Rapid developments in live-cell three-dimensional (3D) microscopy enable imaging of cell morphology and signaling with unprecedented detail. However, tools to systematically measure and visualize the intricate relationships between intracellular signaling, cytoskeletal organization and downstream cell morphological outputs do not exist. Here, we introduce u-shape3D, a computer graphics and machine-learning pipeline to probe molecular mechanisms underlying 3D cell morphogenesis and to test the intriguing possibility that morphogenesis itself affects intracellular signaling. We demonstrate a generic morphological motif detector that automatically finds lamellipodia, filopodia, blebs and other motifs. Combining motif detection with molecular localization, we measure the differential association of PIP2 and KrasV12 with blebs. Both signals associate with bleb edges, as expected for membrane-localized proteins, but only PIP2 is enhanced on blebs. This indicates that subcellular signaling processes are differentially modulated by local morphological motifs. Overall, our computational workflow enables the objective, 3D analysis of the coupling of cell shape and signaling.
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Data are available from the corresponding author upon reasonable request.
The latest version of the software described here, as well as a user’s guide, is available from https://github.com/DanuserLab/u-shape3D.
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This research was funded by grants from the Cancer Prevention Research Institute of Texas (nos. RR160057 to R.F. and R1225 to G.D.) and the National Institutes of Health (nos. F32GM116370 and K99GM123221 to M.K.D., K25CA204526 to E.S.W., F32GM117793 to K.M.D., R33CA235254 to R.F. and R01GM067230 to G.D.). Confocal imaging was performed at the UT Southwestern Live Cell Imaging Facility. Most surface renderings were performed using UCSF ChimeraX, which was developed by the Resource for Biocomputing, Visualization and Informatics at the University of California, San Francisco (supported by grant no. P41GM103311). We thank T. Goddard for assistance with ChimeraX, as well as I. de Vries, J. Renkawitz and M. Sixt for assistance differentiating dendritic cells. We would also like to thank F. Peri (University of Zurich) and members of her laboratory, especially M. Albert, for the unpublished images of microglia cells. We also thank P. Friedl (MD Anderson Cancer Center) for the MV3 melanoma cells, S. Morrison (UT Southwestern) for the primary melanoma cells, M. Sixt (IST Austria) for the dendritic cell precursors, J. Minna and J. Shay (UT Southwestern) for the transformed HBEC cells and R. McIntosh (University of Colorado, Boulder) for the U2OS osteosarcoma cells.
The authors declare no competing interests.
Peer review information: Rita Strack was the primary editor on this article and managed its editorial process and peer review in collaboration with the rest of the editorial team.
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Integrated supplementary information
(a) Surface renderings of an HBEC expressing tractin-GFP. (b) MIPs of the cell shown in a. (c) Surface renderings of a dendritic cell expressing Lifeact-GFP. (d) Surface renderings of an MV3 melanoma cell expressing tractin-GFP. (e) MIPs of the cell shown in c. (f) MIPs of the cell shown in d.
For the cell shown in Fig. 2f–p, a MIP (top) and the corresponding rendered surface colored by bleb detection (bottom) are shown. The blebs were detected using an SVM model derived from Weiner deconvolved images with an apodization height of 0.04. Images are (a) not deconvolved, Richardson-Lucy deconvolved for (b) 10 iterations and (c) 100 iterations, and Weiner deconvolved with an apodization height of (d) 0.00, (e) 0.04, (f) 0.08, (g) and 0.12.
(a) A MIP across 4 µm of a deconvolved image of a dendritic cell expressing LifeAct-GFP. This image was segmented by processing the deconvolved image into three images that accentuate different features: (b) a renormalized deconvolved image, (c) an image that emphasizes the interior of the cell, and (d) an image that emphasizes planar features, such as lamellipodia. These three images were combined into (e) a composite image. (f) Finally, a mesh was generated from an isosurface of the composite image.
(a) Spill-depth based merging without triangle or line-of-sight (LOS) merging. A spill-depth ratio of 0.15 is used throughout the paper. (b) Triangle merging following spill-depth merging but without LOS merging. Elsewhere in the paper a triangle parameter of 0.7 is used. (c) LOS merging following spill-depth merging but without triangle merging. Elsewhere in the paper an LOS parameter of 0.7 is used.
Blebs are detected on two melanoma cells (left), filopodia on two HBEC cells (center) and lamellipodia on two dendritic cells (right).
(a) A melanoma cell with blebs detected via a model trained by a single user who clicked on patches that were certainly blebs or certainly not blebs. (b) Validation metrics for models trained by the same user on three different cells and applied to the cell shown in a. For the ‘Click on blebs’ column, training data was generated by asking the user to click on all patches that are blebs. For the ‘Click on not blebs’ column, the user was asked to click on all patches that are not blebs. Finally, for the ‘Click on certain’ column, the user was asked to click on all patches that are certainly blebs and then asked to click on all patches that are certainly not blebs. For this column, the user clicked on 39 of the 279 patches. (c) Models trained by the same user on four distinct MV3 cells (left), on those four cells combined (center), and on 19 MV3 cells (right). (d) Models trained by three different users on the same four MV3 cells as in c.
(a) Supervised, SVM-based classification of patches into blebs (purple) and not blebs (gray). The SVM was trained on seven MV3 cells imaged via ASLM. (b) For the same set of cells, an unsupervised hierarchical clustering of patches into 2 clusters. (c) Unsupervised hierarchical clustering into 4 clusters of the supervised classification shown in a.
Supplementary Figure 8 Additional example morphological motif detections of cells imaged via diverse microscopy modalities.
(a) Three views of blebs detection on an MV3 cell expressing tractin-GFP imaged via a laser scanning confocal microscope. The bleb detection model was trained on eight MV3 cells imaged via the same microscope. (b) Extensions detected on microglia cells imaged within a zebrafish via a Zeiss LightSheet Z.1 light-sheet microscope. The extension detection model was trained on eight such cells. (c) Lamellipodia detected on a T cell imaged via lattice light-sheet microscopy. The lamellipodia detection model was trained on thirteen dendritic cells imaged via meSPIM.
MV3 cells expressing cytosolic GFP imaged via ASLM, a high-resolution light-sheet imaging modality, with blebs detected by a model trained on (a) nineteen MV3 cells expressing tractin-GFP imaged via meSPIM and (b) eight cells expressing cytosolic GFP imaged via ASLM. MV3 cells expressing tractin-GFP imaged via a laser scanning confocal microscope with blebs detected by a model trained on (c) nineteen MV3 cells expressing tractin-GFP imaged via meSPIM and (d) eight cells expressing tractin-GFP imaged via a confocal microscope. (e) Validation of bleb detection models trained on MV3 melanoma cells imaged via diverse microscopes (model column) and applied to the same or different sets of MV3 melanoma cell images (data column).
(a) Blebs detected on the MV3 cell shown in Fig. 6b, which is expressing GFP-KrasV12, using a model trained on MV3 cells expressing tractin-GFP. Each bleb is randomly colored. (b) Uropods and retraction fibers detected on MV3 cells expressing GFP-KrasV12. (c) The uropod detected on the cell shown in a. (d) For the same cell, detected blebs (see a) with the detected uropod patches (see c) removed.
(a) A surface rendering of an MV3 melanoma cell with detected blebs shown white and detected non-blebs shown black. (b) A surface rendering of the same cell colored by normalized local bleb density. White indicates regions of high local bleb density, whereas black indicates regions of low local bleb density. Distributions of normalized bleb density for cells expressing (c) GFP-KrasV12 (n=13 cells) and (d) PLCΔ-PH-GFP (n=6 cells), a PIP2 translocation biosensor. The red lines show the distribution above one standard deviation above the mean intensity, and the orange lines shows the distribution below one standard deviation below the mean intensity. (e) Fluorescence intensity at mesh faces vs. distance from a bleb edge for synthetic images. The dark blue line shows the intensity for 9 cytosolically labeled cells, and the lighter blue lines show the intensity for the same set of 9 cells with cortical, rather than cytosolic, labeling of various thicknesses. (f) Distributions of fluorescence intensity, measured over 1 µm, for 5 GFP cytosolically labeled MV3 cells. The solid line shows the intensity distribution for mesh faces on blebs, whereas the dashed line shows the distribution off blebs. The blue line shows the distribution for mesh faces on blebs with greater than mean bleb volume, whereas the red line shows the distribution on blebs with less than mean volume.
Total cell lysates (20 µg) of U2OS wild-type, Wave2 and cofilin-1 knockout cells were separated by SDS-PAGE and immunoblotted as indicated. GAPDH served as loading control. This blot is representative of two blots (n=2).
An MV3 melanoma cell expressing tractin-GFP. (a) Five xy-slices sampled 4 µm apart. The raw data is shown cyan, whereas a pixelation of the mesh representing the cell surface is shown red. (b) A 3D rendering of the extracted cell surface for the same cell.
(a) The convergence of the mutual visibility between patches as a function of number of rays tested. The black line shows the standard error about the mean mutual visibility, and the gray region shows the standard deviation of that standard error. Throughout the paper 20 rays are used to calculate mutual visibility. (b) The frequency of protrusive motion minus the frequency of retractive motion at mesh faces on and off blebs as a function of surface speed. The ‘backwards’ motion algorithm, used elsewhere in the paper, is shown on the left, and the ‘forwards’ motion algorithm is shown on the right.
(a) Segmentation of the cell surface into convex patches via the same workflow used for microscopic data. (b) Detection of blebs using a single SVM bleb classifier trained on synthetic data.
Supplementary Figs. 1–15 and Supplementary Tables 1–6.
Rotations of surface renderings. Renderings of the extracted surfaces of a dendritic cell (first), an MV3 melanoma cell (second) and a transformed human bronchial epithelial cell (third).
3D image of an MV3 melanoma cell expressing GFP-KrasV12. The image’s field of view is 79 × 47 × 55 µm3 in x, y and z, respectively, and the video scans through the z-dimension.
Video of an xy-slice of an MV3 melanoma cell expressing GFP-KrasV12. The field of view is 27 × 32 µm2, and the time between frames is 21 s.
Rotations of morphological motif detections.Blebs detected on an MV3 melanoma cell (first), lamellipodia detected on a dendritic cell (second) and filopodia detected on a human bronchial epithelial cell (third).
Extensions detected on an MDA-MB-231 human breast cancer cell moving through the vasculature of a zebrafish embryo. The cell was imaged via an adaptive optics lattice light-sheet microscope.
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Driscoll, M.K., Welf, E.S., Jamieson, A.R. et al. Robust and automated detection of subcellular morphological motifs in 3D microscopy images. Nat Methods 16, 1037–1044 (2019) doi:10.1038/s41592-019-0539-z
Nature Methods (2019)