Name: live imaging of cell extrusion from the epidermis of developing zebrafish
Uploaded: 2011-06-27T12:00:00
Description: Watch this Scientific Journal Video about Live Imaging of Cell Extrusion from the Epidermis of Developing Zebrafish at JoVE.com

We thank members of the Rosenblatt laboratory for scientific discussions, suggestions, and comments. We would also like to thank Mary Halloran who kindly provided the plasmid encoding RFP-UtrCH and David Grunwald who provided the CK:GFP transgenic zebrafish. Thanks also to Gretchen King and the staff of the Centralized Zebrafish Resource at the University of Utah for excellent maintenance and care of the zebrafish. This work was supported by NIH-NIGMS NIH Director&#x2019;s New Innovator Award 1 DP2 OD002056-01 to JR. GTE was supported by NIH Multidisciplinary Cancer Training Program Grant 5T32 CA03247-8.

Basic Workflow for the Visualization of Actin Dynamics During Cell Extrusion in the Epidermis of Developing Zebrafish 
The epidermis of the developing zebrafish is comprised of two distinct layers, the surface layer (or periderm) and a basal layer of cells 
that contact the basement membrane2. The cells of the outer surface layer undergo apoptosis and are eliminated from the tissue by
 extrusion3 (Figure 1). To visualize this process in real time, we inje...

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The protocol described here demonstrates a simple and straightforward method to visualize the process of extrusion in a live epithelial tissue. This type of experiment allows us to examine subtleties of actin dynamics not previously appreciated in fixed tissue analyses, and therefore, complements common immunofluorescent methods. We can use this protocol in combination with chemical inhibitors or genetic mutants to better analyze the extrusion process and study disease states associated with the failure to remove and c...

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live imaging of cell extrusion from the epidermis of developing zebrafish

Homeostatic maintenance of epithelial tissues requires the continual removal of damaged cells without disrupting barrier function. Our studies have found that dying cells send signals to their live neighbors to form and contract a ring of actin and myosin that ejects it out from the epithelial sheet while closing any gaps that might have resulted from its exit, a process termed cell extrusion1. The optical clarity of developing zebrafish provides an excellent system to visualize extrusion in living epithelia. Here we describe a method to induce and image extrusion in the larval zebrafish epidermis. To visualize extrusion, we inject a red fluorescent protein labeled probe for F-actin into one-cell stage transgenic zebrafish embryos expressing green fluorescent protein in the epidermis and induce apoptosis by addition of G418 to larvae. We then use time-lapse imaging on a spinning disc confocal microscope to observe actin dynamics and epithelial cell behaviors during the process of apoptotic cell extrusion. This approach allows us to investigate the extrusion process in live epithelia and will provide an avenue to study disease states caused by the failure to eliminate apoptotic cells.

Watch this Scientific Journal Video about Live Imaging of Cell Extrusion from the Epidermis of Developing Zebrafish at JoVE.com

Live Imaging of Cell Extrusion from the Epidermis of Developing Zebrafish

Dying cells are extruded from epithelial tissues by concerted contraction of neighboring cells without disrupting barrier function. The optical clarity of developing zebrafish provides an excellent system to visualize extrusion in living epithelia. Here we describe methods to induce and image extrusion in the larval zebrafish epidermis at cellular resolution.

Homeostatic maintenance of epithelial tissues requires the continual removal of damaged cells without disrupting barrier function.  Our studies have found ...

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