Name: protrusion force microscopy: a method to quantify forces developed by cell protrusions
Uploaded: 2018-06-16T14:00:00
Description: Watch this Scientific Journal Video about Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions at JoVE.com

The authors are grateful to Anna Labernadie, Guillaume Charri&#232;re and Patrick Delobelle for their initial contribution to this work and to Matthieu Sanchez and Fran&#231;oise Viala for their help with video filming and editing. This work has been supported by l'Agence Nationale de la Recherche (ANR14-CE11-0020-02), la Fondation pour la Recherche M&#233;dicale (FRM DEQ2016 0334894), INSERM Plan Cancer, Fondation Toulouse Cancer and Human Frontier Science Program (RGP0035/2016).

1. Preparation of Formvar-Coated Grids
<ol>
	<li>Clean electron microscopy grids with pure acetone and dry them on filter paper. Then clean a microscope slide with pure ethanol, wipe with a lens paper and remove dust with a blower.</li>
	<li>Place an ethanol-cleaned glass slide vertically in the funnel of a film casting device containing a solution of Formvar in the lower part. Cover the top of the funnel.</li>
	<li>Pump 100 mL of Formvar solution (0.5% in ethylene dichloride) with the atomizer bulb until the level rea...

<ol>
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Material properties
The choice of the material for the deformable membrane, in our case Formvar, needs to fulfill a few requirements. The material must be transparent to visible light and exhibit limited auto fluorescence to allow observations in bright field and fluorescence microscopy. The roughness of the thin film must be well below 10 nm to avoid any topographical effect on cell adhesion and to allow clear observation of the cell-induced protrusions by AFM imaging. Finall...

Animal cells interact physically with the matrix and the other cells that constitute their environment1. This is required for them to migrate, internalize bodies, acquire external information, or differentiate. In such processes, the cell must generate mechanical forces and, as numerous studies have shown over the recent years, the ability of a cell to generate forces and probe its environment influences its biological behavior, directing for instance proliferation or differentiation2,3. In turn, the measurement of cellular forces is a major aid to study the regulation of force generation and understand its implication in cell behavior and tissue fate4,5.
Recent years have witnessed the development of numerous techniques to measure the forces that a cell can exert on its environment6. The majority of these have been instrumental in revealing the traction forces that cells exert as they pull on mobile probes or a deformable substrate. However, the mechanical forces involved in protrusion into the extracellular environment suffer from a lack of measurement techniques and are to date not well characterized.
To overcome this limitation, we present a method to measure forces exerted orthogonally to the substrate. It consists in plating living cells on a thin elastic sheet that can deform in the orthogonal direction, making it possible to measure substrate deformation by the cells and deduce the forces involved. Substrate topography is measured with nanoscale resolution using atomic force microscopy and the evaluation of forces from deformation relies on the knowledge of the geometry of the protrusive cellular structures7,8,9.
Here, we describe the setup and its application to measure the forces generated by podosomes, protrusive adhesion structures formed by macrophages for their mesenchymal migration in three-dimensional environments10,11,12,13,14,15,16,17. We believe that this technique will advance the understanding of force generation and its regulation in the many cellular processes involving protrusion.

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		<tr height="51">
			<td height="51" style="height:51px;width:216px;">200 mesh nickel grids</td>
			<td style="width:71px;">Electron Microscopy Sciences</td>
			<td style="width:119px;">G200-Ni</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="34">
			<td height="34" style="height:34px;width:216px;">Filter paper</td>
			<td style="width:71px;">Sigma-Aldrich</td>
			<td style="width:119px;">1001-055</td>
			<td></td>
		</tr>
		<tr height="34">
			<td height="34" style="height:34px;width:216px;">Microscope slides</td>
			<td style="width:71px;">Fisher Scientific</td>
			<td style="width:119px;">10235612</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:216px;">White stickers 26 x 70 mm</td>
			<td style="width:71px;">Avery</td>
			<td style="width:119px;">DP033-100</td>
			<td></td>
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			<td height="51" style="height:51px;width:216px;">Film casting device with valve in its outlet</td>
			<td style="width:71px;">Electron Microscopy Sciences</td>
			<td style="width:119px;">71305-01</td>
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			<td height="51" style="height:51px;width:216px;">Razorblades</td>
			<td style="width:71px;">Electron Microscopy Sciences</td>
			<td style="width:119px;">72000</td>
			<td></td>
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			<td height="21" style="height:21px;width:216px;">Ethanol</td>
			<td style="width:71px;">VWR</td>
			<td style="width:119px;">1.08543.0250</td>
			<td></td>
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			<td height="21" style="height:21px;width:216px;">Acetone</td>
			<td style="width:71px;">VWR</td>
			<td style="width:119px;">20066.321</td>
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			<td height="51" style="height:51px;width:216px;">Formvar 0.5% solution in ethylene dichloride</td>
			<td style="width:71px;">Electron Microscopy Sciences</td>
			<td style="width:119px;">15820</td>
			<td></td>
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			<td height="21" style="height:21px;width:216px;">12 mm coverslips</td>
			<td style="width:71px;">VWR</td>
			<td style="width:119px;">631-0666</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Inverted microscope</td>
			<td style="width:71px;">Carl Zeiss</td>
			<td style="width:119px;">Axiovert 200</td>
			<td></td>
		</tr>
		<tr height="51">
			<td height="51" style="height:51px;width:216px;">Atomic Force Microscope</td>
			<td style="width:71px;">JPK Instruments</td>
			<td style="width:119px;">NanoWizard III</td>
			<td></td>
		</tr>
		<tr height="51">
			<td height="51" style="height:51px;width:216px;">Temperature-controlled sample holder&#160;</td>
			<td style="width:71px;">JPK Instruments</td>
			<td style="width:119px;">BioCell</td>
			<td></td>
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		<tr height="60">
			<td height="60" style="height:60px;width:216px;">Silicon nitride cantilever with a nominal spring constant of 0.01 N/m</td>
			<td style="width:71px;">Veeco Instruments</td>
			<td style="width:119px;">MLCT-AUHW</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:216px;">PBS</td>
			<td style="width:71px;">Gibco</td>
			<td style="width:119px;">14190-094</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Double-sided adhesive tape</td>
			<td style="width:71px;">APLI AGIPA</td>
			<td style="width:119px;">118100</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">RPMI 1640</td>
			<td style="width:71px;">Gibco</td>
			<td style="width:119px;">31870-025</td>
			<td></td>
		</tr>
		<tr height="34">
			<td height="34" style="height:34px;width:216px;">FCS</td>
			<td style="width:71px;">Sigma-Aldrich</td>
			<td style="width:119px;">F7524</td>
			<td></td>
		</tr>
		<tr height="34">
			<td height="34" style="height:34px;width:216px;">HEPES&#160;</td>
			<td style="width:71px;">Sigma-Aldrich</td>
			<td style="width:119px;">H0887</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">35 mm glass-bottom Petri dishes</td>
			<td style="width:71px;">WPI</td>
			<td style="width:119px;">FD35-100</td>
			<td></td>
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protrusion force microscopy: a method to quantify forces developed by cell protrusions

In numerous biological contexts, animal cells need to interact physically with their environment by developing mechanical forces. Among these, traction forces have been well-characterized, but there is a lack of techniques allowing the measurement of the protrusion forces exerted by cells orthogonally to their substrate. We designed an experimental setup to measure the protrusion forces exerted by adherent cells on their substrate. Cells plated on a compliant Formvar sheet deform this substrate and the resulting topography is mapped by atomic force microscopy (AFM) at the nanometer scale. Force values are then extracted from an analysis of the deformation profile based on the geometry of the protrusive cellular structures. Hence, the forces exerted by the individual protruding units of a living cell can be measured over time. This technique will enable the study of force generation and its regulation in the many cellular processes involving protrusion. Here, we describe its application to measure the protrusive forces generated by podosomes formed by human macrophages.

The above protocol describes how to prepare the experimental setup to quantify protrusion forces applied by macrophage podosomes on a Formvar substrate. This is achieved using AFM and is illustrated in Figure 1.
When analyzing a topographical image of bulges beneath podosomes using the JPK data processing software, a third-degree polynomial fit should be subtracted from each scan line independently....

Watch this Scientific Journal Video about Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions at JoVE.com

Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions

Here, we detail the experimental techniques used to evaluate the protrusion forces that podosomes apply on a compliant film, from the preparation of the film to the automated analysis of topographical images.

In numerous biological contexts, animal cells need to interact physically with their environment by developing mechanical forces. Among these, traction ...

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