Name: real-time detection and capture of invasive cell subpopulations from co-cultures
Uploaded: 2022-03-30T14:00:00
Description: Watch this Scientific Journal Video about Real-Time Detection and Capture of Invasive Cell Subpopulations from Co-Cultures at JoVE.com

We would like to thank Dr. Alana Welms, Huntsman Cancer Institute, University of Utah, for providing us with the patient-derived xenografts (HCI-010). This work was supported by NIH grants R01CA205632, R21CA226542, and in part, by a grant from Agilent Technologies.

The study was reviewed and considered as &#34;exempt&#34; by the Institutional Review Board of Georgetown University (IRB # 2002-022). Freshly harvested bone marrow tissues were collected from discarded healthy human bone marrow collection filters that had been de-identified.
1. New chamber design (Figure 2)
<ol>
	<li>Open a new dual-chamber cell analyzer plate. Set aside the top chamber with electrodes.</li>
	<li>Using a millin...

<ol>
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We have modified the design of a dual-chambered array to include a third chamber for monitoring cell invasion in real-time in the presence of stromal cells. We have observed distinct effects of co-cultured fibroblasts on invasive and non-invasive cancer cells indicating that the array can be used to distinguish between cancer cell subpopulations that respond differently to factors produced by co-cultured stromal cells. The array was also used to monitor endothelial cell invasion into stromal tissues, a critical step duri...

Cell invasion is an important process that allows cells to cross basement membrane barriers in response to environmental cues provided by stromal cells. It is a crucial step during several stages of development for immune responses, wound healing, tissue repair, and malignancies that can progress from local lesions to invasive and metastatic cancers1. Assays developed early on to measure the invasive potential of cell populations typically generate a single endpoint measurement or require pre-labeling of invasive cells2. The integration of microelectronics and microfluidics techniques is now developed to detect different aspects of cell biology such as viability, movement, and attachment using the electric impedance of live cells on microelectrodes3,4. Impedance measurement allows for a label-free, non-invasive and quantitative assessment of cell status3. Here we describe a three-chambered array based on the design of the Real-Time Cellular Analysis (RTCA) system that was developed by Abassi et al.5. The three-chambered array allows for the assessment of co-cultured cells on cellular invasion and recovery of invasive cells for additional analyses or expansion.
In the cell analyzer system, cells invade through an extracellular matrix coated onto a porous membrane and reach an interdigitated electrode array positioned on the opposite side of the barrier. As the invasive cells continue to attach and occupy this electrode array over time, the electrical impedance changes in parallel. The current system comprises a cell invasion and migration (CIM) 16-well plate with two chambers. The RTCA-DP (dual purpose) (called dual purpose cell analyzer henceforth) instrument contains sensors for impedance measurement and integrated software to analyze and process the impedance data. Impedance values at baseline depend on the ionic strength of media in the wells and are changed as cells attach to the electrodes. The impedance changes depend on the number of cells, their morphology, and the extent to which cells attach to the electrodes. A measurement of the wells with media before the cells are added is considered as the background signal. The background is subtracted from impedance measurements after reaching equilibrium with cells attaching and spreading onto the electrodes. A unitless parameter of the status of the cells on an electrode termed Cell Index (CI) is calculated as follows: CI = (impedance after equilibrium - impedance in the absence of cells) / nominal impedance value6. When migration rates of different cell lines are compared, the Delta CI can be used to compare cell status regardless of the difference in attachment that is represented in the first few measurements.
The newly designed three-chambered array builds on the existing design and uses the top chamber from the dual purpose cell analyzer system that contains the electrodes. The modified middle and bottom chambers are adapted to fit the assembly into the dual purpose cell analyzer for impedance measurement and analysis using the integrated software. The two major advances that the new design provides over the existing dual-chamber CIM-plate (called cell analyzer plate henceforth) are: i) the ability to recover, and then analyze invasive cell subpopulations that are present in heterogeneous cell mixes and ii) the option to assess the impact of secreted factors from co-cultured stromal or immune cells on cell invasion (Figure 1).
This technology can be useful in studying the subpopulations of cells with different invasive capacities. That includes (a) invasive cancer cells that invade surrounding tissues or blood and lymphatic vessels or extravasate at metastatic seeding sites in distant organs, (b) cells from the immune system that invade tissues to tackle pathogens or diseased cells, (c) endothelial cells that invade tissues to form new blood vessels during tissue reorganization or wound healing, as well as (d) stromal cells from the tumor microenvironment that support and invade along with cancer cells. The approach allows the inclusion of stromal cross-talk that can modulate cell motility and invasion. The feasibility studies shown here use this modified array focused on cancer cell invasion and the interaction with the stroma as a model system, including endothelial invasion in response to differential signals from cancer cells. The approach can be extrapolated to isolate cancer cells and other cell types such as subpopulations of immune cells, fibroblasts, or endothelial cells. We tested invasive and non-invasive established breast cancer cell lines as a proof of principle. We also used cells from patient-derived xenograft (PDX) invasion in response to immune cells from human bone marrow to show feasibility for future use also in clinical diagnostic settings. PDX are patient tumor tissues that are implanted in immunocompromised or humanized mice model to allow for studying of growth, progression, and treatment options for the original patient7,8.

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		<tr>
			<td>0.05% Trypsin-EDTA</td>
			<td>Thermofisher</td>
			<td>25300-054</td>
			<td></td>
		</tr>
		<tr>
			<td>Adhesive</td>
			<td>Norland Optical Adhesive</td>
			<td>NOA63</td>
			<td></td>
		</tr>
		<tr>
			<td>Bovine serum albumin (BSA)</td>
			<td>Sigma</td>
			<td>A9418</td>
			<td></td>
		</tr>
		<tr>
			<td>Cell lifter</td>
			<td>Sarstedt</td>
			<td>83.1832</td>
			<td></td>
		</tr>
		<tr>
			<td>Cholera Toxin from Vibrio cholerae</td>
			<td>Thermofisher</td>
			<td>12585-014</td>
			<td></td>
		</tr>
		<tr>
			<td>CIM-plate</td>
			<td>Agilent</td>
			<td>5665817001</td>
			<td>Cell analyzer plate</td>
		</tr>
		<tr>
			<td>Collagenase from Clostridium histolyticum</td>
			<td>Sigma</td>
			<td>C0130</td>
			<td></td>
		</tr>
		<tr>
			<td>Dispase</td>
			<td>StemCell</td>
			<td>7913</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM</td>
			<td>Thermofisher</td>
			<td>11995-065</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM-F12</td>
			<td>Thermofisher</td>
			<td>11875-093</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal Bovine Serum (FBS), Heat Inactivated</td>
			<td>Omega Scientific</td>
			<td>FB-12</td>
			<td></td>
		</tr>
		<tr>
			<td>HEPES</td>
			<td>Thermofisher</td>
			<td>15630106</td>
			<td></td>
		</tr>
		<tr>
			<td>Horse serum (HS)</td>
			<td>Gibco</td>
			<td>16050-122</td>
			<td></td>
		</tr>
		<tr>
			<td>Human EGF</td>
			<td>Peprotech</td>
			<td>AF-100-15</td>
			<td></td>
		</tr>
		<tr>
			<td>Human umbilical Vein endothelail cells (HUVEC)</td>
			<td>LONZA (RRID:CVCL_2959)</td>
			<td>C-2517A</td>
			<td></td>
		</tr>
		<tr>
			<td>HUVEC media</td>
			<td>LONZA</td>
			<td>CC-3162</td>
			<td></td>
		</tr>
		<tr>
			<td>Hydrocortisone</td>
			<td>Sigma</td>
			<td>H4001</td>
			<td></td>
		</tr>
		<tr>
			<td>Insulin Transferrin Selenium Ethanolamine (ITSX) (100x)</td>
			<td>Thermofisher</td>
			<td>51500056</td>
			<td></td>
		</tr>
		<tr>
			<td>Insulin, Human Recombinant, Zinc Solution</td>
			<td>Sigma</td>
			<td>C8052</td>
			<td></td>
		</tr>
		<tr>
			<td>J2 Fibroblasts</td>
			<td>Stemcell (RRID:CVCL_W667)</td>
			<td>100-0353</td>
			<td></td>
		</tr>
		<tr>
			<td>LymphoPrep</td>
			<td>Stemcell</td>
			<td>7851</td>
			<td>Density gradient medium for the isolation of mononuclear cells</td>
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		<tr>
			<td>Matrigel</td>
			<td>Corning</td>
			<td>354230</td>
			<td>Basement membrane matrix</td>
		</tr>
		<tr>
			<td>MCFDCIS.com cells ( DCIS)</td>
			<td>RRID:CVCL_5552</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>MDA-MB-231 cells</td>
			<td>RRID:CVCL_0062</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Milling machine</td>
			<td></td>
			<td></td>
			<td>Bridgeport Series 1 Vertical</td>
		</tr>
		<tr>
			<td>Phosphate-buffered saline (1x)</td>
			<td>Thermofisher</td>
			<td>10010049</td>
			<td></td>
		</tr>
		<tr>
			<td>Polyethersulfone (PES) membrane</td>
			<td>Sterlitech</td>
			<td>PCTF029030</td>
			<td></td>
		</tr>
		<tr>
			<td>RBC lysis solution</td>
			<td>Stemcell</td>
			<td>7800</td>
			<td></td>
		</tr>
		<tr>
			<td>RNeasy Micro Kit</td>
			<td>Qiagen</td>
			<td>74004</td>
			<td></td>
		</tr>
		<tr>
			<td>RTCA DP analyzer</td>
			<td>Agilent</td>
			<td>3X16</td>
			<td>Dual purpose cell analyzer</td>
		</tr>
		<tr>
			<td>Trypsin</td>
			<td>Sigma</td>
			<td>T4799</td>
			<td></td>
		</tr>
	</tbody>
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real-time detection and capture of invasive cell subpopulations from co-cultures

Invasion and metastatic spread of cancer cells are the major cause of death from cancer. Assays developed early on to measure the invasive potential of cancer cell populations typically generate a single endpoint measurement that does not distinguish between cancer cell subpopulations with different invasive potential. Also, the tumor microenvironment consists of different resident stromal and immune cells that alter and participate in the invasive behavior of cancer cells. Invasion into tissues also plays a role in immune cell subpopulations fending off microorganisms or eliminating diseased cells from the parenchyma and endothelial cells during tissue remodeling and angiogenesis. Real-Time Cellular Analysis (RTCA) that utilizes impedance biosensors to monitor cell invasion was a major step forward beyond endpoint measurement of invasion: this provides continuous measurements over time and thus can reveal differences in invasion rates that are lost in the endpoint assay. Using current RTCA technology, we expanded dual-chamber arrays by adding a further chamber that can contain stromal and/or immune cells and allows measuring the rate of invasion under the influence of secreted factors from co-cultured stromal or immune cells over time. Beyond this, the unique design allows for detaching chambers at any time and isolating of the most invasive cancer cell, or other cell subpopulations that are present in heterogeneous mixes of tumor isolates tested. These most invasive cancer cells and other cell subpopulations drive malignant progression to metastatic disease, and their molecular characteristics are important for in-depth mechanistic studies, the development of diagnostic probes for their detection, and the assessment of vulnerabilities. Thus, the inclusion of small- or large-molecule drugs can be used to test the potential of therapies that target cancer and/or stromal cell subpopulations with the goal of inhibiting (e.g., cancer cells) or enhancing (e.g., immune cells) invasive behavior.

Using the newly designed three-chambered array, invasion of the cells was tested in the presence or absence of stromal cells such as fibroblasts. MDA-MB-231 cell invasion was enhanced when irradiated Swiss 3T3 fibroblasts (J2 strain) were seeded in the bottom chamber, allowing for the exchange of factors between the two cell lines. Interestingly, MDA-MB-231 invasion increased when 3T3-J2 cells were doubled in number (Figure 3A). On the other hand, the invasion rate of an invasive clone of MC...

Watch this Scientific Journal Video about Real-Time Detection and Capture of Invasive Cell Subpopulations from Co-Cultures at JoVE.com

Real-Time Detection and Capture of Invasive Cell Subpopulations from Co-Cultures

We describe an approach to detect and capture invasive cell subpopulations in real-time. The experimental design uses Real-Time Cellular Analysis by monitoring changes in the electric impedance of cells. Invasive cancer, immune, endothelial or stromal cells in complex tissues can be captured, and the impact of co-cultures can be assessed.

Invasion and metastatic spread of cancer cells are the major cause of death from cancer. Assays developed early on to measure the invasive potential of ...

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