Name: multi-stream perfusion bioreactor integrated with outlet fractionation for dynamic cell culture
Uploaded: 2022-07-20T13:45:00
Description: Watch this Scientific Journal Video about Multi-Stream Perfusion Bioreactor Integrated with Outlet Fractionation for Dynamic Cell Culture at JoVE.com

This research was conducted with support under Grant Nos. R01EB012521, R01EB028782, and T32 GM008339 from the National Institutes of Health.

1. Prepare parts for well plate perfusion
<ol>
	<li>Prepare tubing
	<ol>
		<li>Cut two lengths of silicone tubing (1.6 mm inner diameter) for each cell culture to be perfused. Ensure that the piece used as the upstream tubing is long enough to reach from the syringe pump to the cell culture inside the incubator, and that the downstream piece can reach from the cell culture to the furthest extended position of the fraction collector.</li>
		<li>Give each piece of tubing a unique label on both of its end...

<ol>
	<li>Welsh, D. K., Yoo, S. H., Liu, A. C., Takahashi, J. S., Kay, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bioluminescence+imaging+of+individual+fibroblasts+reveals+persistent,+independently+phased+circadian+rhythms+of+clock+gene+expression.">Bioluminescence imaging of individual fibroblasts reveals persistent, independently phased circadian rhythms of clock gene expression.</a> Current Biology. 14 (24), 2289-2295 (2004).</li><li>Talaei, K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+mathematical+model+of+the+dynamics+of+cytokine+expression+and+human+immune+cell+activation+in+response+to+the+pathogen+Staphylococcus+aureus.">A mathematical model of the dynamics of cytokine expression and human immune cell activation in response to the pathogen Staphylococcus aureus.</a> Frontiers in Cellular and Infection Microbiology. 11, 711153 (2021).</li><li>Kemas, A. M., Youhanna, S., Zandi Shafagh, R., Lauschke, V. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Insulin-dependent+glucose+consumption+dynamics+in+3D+primary+human+liver+cultures+measured+by+a+sensitive+and+specific+glucose+sensor+with+nanoliter+input+volume.">Insulin-dependent glucose consumption dynamics in 3D primary human liver cultures measured by a sensitive and specific glucose sensor with nanoliter input volume.</a> FASEB Journal. 35 (3), 21305 (2021).</li><li>Muzzey, D., van Oudenaarden, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Quantitative+time-lapse+fluorescence+microscopy+in+single+cells.">Quantitative time-lapse fluorescence microscopy in single cells.</a> Annual Review of Cell and Developmental Biology. 25, 301-327 (2009).</li><li>Calligaro, H., Kinane, C., Bennis, M., Coutanson, C., Dkhissi-Benyahya, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+standardized+method+to+assess+the+endogenous+activity+and+the+light-response+of+the+retinal+clock+in+mammals.">A standardized method to assess the endogenous activity and the light-response of the retinal clock in mammals.</a> Molecular Vision. 26, 106-116 (2020).</li><li>Battat, S., Weitz, D. A., Whitesides, G. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+outlook+on+microfluidics:+the+promise+and+the+challenge.">An outlook on microfluidics: the promise and the challenge.</a> Lab on a Chip. 22 (3), 530-536 (2022).</li><li>Petrenko, V., Saini, C., Perrin, L., Dibner, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Parallel+measurement+of+circadian+clock+gene+expression+and+hormone+secretion+in+human+primary+cell+cultures.">Parallel measurement of circadian clock gene expression and hormone secretion in human primary cell cultures.</a> Journal of Visualized Experiments. (117), e54673 (2016).</li><li>Yamagishi, K., Enomoto, T., Ohmiya, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Perfusion-culture-based+secreted+bioluminescence+reporter+assay+in+living+cells.">Perfusion-culture-based secreted bioluminescence reporter assay in living cells.</a> Analytical Biochemistry. 354 (1), 15-21 (2006).</li><li>Watanabe, T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Multichannel+perfusion+culture+bioluminescence+reporter+system+for+long-term+detection+in+living+cells.">Multichannel perfusion culture bioluminescence reporter system for long-term detection in living cells.</a> Analytical Biochemistry. 402 (1), 107-109 (2010).</li><li>Murakami, N., Nakamura, H., Nishi, R., Marumoto, N., Nasu, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Comparison+of+circadian+oscillation+of+melatonin+release+in+pineal+cells+of+house+sparrow,+pigeon+and+Japanese+quail,+using+cell+perfusion+systems.">Comparison of circadian oscillation of melatonin release in pineal cells of house sparrow, pigeon and Japanese quail, using cell perfusion systems.</a> Brain Research. 651 (1-2), 209-214 (1994).</li><li>Erickson, P., Houwayek, T., Burr, A., Teryek, M., Parekkadan, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+continuous+flow+cell+culture+system+for+precision+cell+stimulation+and+time-resolved+profiling+of+cell+secretion.">A continuous flow cell culture system for precision cell stimulation and time-resolved profiling of cell secretion.</a> Analytical Biochemistry. 625, 114213 (2021).</li><li>Saltzman, W. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Drug Delivery: Engineering Principles for Drug Therapy. , (2001).</li><li>Fogler, H. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Elements of Chemical Reaction Engineering. 4th edn. , (2006).</li><li>Conesa, J. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Chemical Reactor Design: Mathematical Modeling and Applications. , (2019).</li><li>Toson, P., Doshi, P., Jajcevic, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Explicit+residence+time+distribution+of+a+generalised+cascade+of+continuous+stirred+tank+reactors+for+a+description+of+short+recirculation+time+(bypassing).">Explicit residence time distribution of a generalised cascade of continuous stirred tank reactors for a description of short recirculation time (bypassing).</a> Processes. 7 (9), 615 (2019).</li><li>Tamayo, A. G., Shukor, S., Burr, A., Erickson, P., Parekkadan, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tracking+leukemic+T-cell+transcriptional+dynamics+in+vivo+with+a+blood-based+reporter+assay.">Tracking leukemic T-cell transcriptional dynamics in vivo with a blood-based reporter assay.</a> FEBS Open Biology. 10 (9), 1868-1879 (2020).</li><li>Newell, B., Bailey, J., Islam, A., Hopkins, L., Lant, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Characterising+bioreactor+mixing+with+residence+time+distribution+(RTD)+tests.">Characterising bioreactor mixing with residence time distribution (RTD) tests.</a> Water Science and Technology. 37 (12), 43-47 (1998).</li><li>Dubois, J., Tremblay, L., Lepage, M., Vermette, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Flow+dynamics+within+a+bioreactor+for+tissue+engineering+by+residence+time+distribution+analysis+combined+with+fluorescence+and+magnetic+resonance+imaging+to+investigate+forced+permeability+and+apparent+diffusion+coefficient+in+a+perfusion+cell+culture+chamber.">Flow dynamics within a bioreactor for tissue engineering by residence time distribution analysis combined with fluorescence and magnetic resonance imaging to investigate forced permeability and apparent diffusion coefficient in a perfusion cell culture chamber.</a> Biotechnology and Bioengineering. 108 (10), 2488-2498 (2011).</li><li>Gaida, L. B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Liquid+and+gas+residence+time+distribution+in+a+two-stage+bioreactor+with+cell+recycle.">Liquid and gas residence time distribution in a two-stage bioreactor with cell recycle.</a> HAL Open Science. , (2008).</li><li>Rodrigues, M. E., Costa, A. R., Henriques, M., Azeredo, J., Oliveira, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Wave+characterization+for+mammalian+cell+culture:+residence+time+distribution.">Wave characterization for mammalian cell culture: residence time distribution.</a> New Biotechnology. 29 (3), 402-408 (2012).</li><li>Olivet, D., Valls, J., Gordillo, M. A., Freix&#243;, A., S&#225;nchez, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Application+of+residence+time+distribution+technique+to+the+study+of+the+hydrodynamic+behaviour+of+a+full-scale+wastewater+treatment+plant+plug-flow+bioreactor.">Application of residence time distribution technique to the study of the hydrodynamic behaviour of a full-scale wastewater treatment plant plug-flow bioreactor.</a> Journal of Chemical Technology and Biotechnology. 80 (4), 425-432 (2005).</li></ol>

This work describes the assembly and operation of a perfusion cell culture system with multiple medium sources demonstrated with a specific example in which the dynamics of NF-&#954;B-driven gene expression in response to a transient pulse of TNF-&#945; were measured. The RTDs of the perfusion system components were measured and modeled, and signal convolution was used to predict both the exposure of the cells to the TNF-&#945; pulse and the TNF-&#945; distribution in the collected effluent medium fractions. The cells we...

Many important biological processes occur in cell and tissue cultures on the timescale of minutes to hours1,2,3. While some of these phenomena may be observed and recorded in an automated fashion using time-lapse microscopy4, bioluminescence1, or other methods, experiments involving the collection of culture supernatant samples for chemical analysis are often performed manually in static cell cultures. Manual sampling limits the feasibility of certain studies due to the inconvenience of frequent or after-hours sampling timepoints. Further shortcomings of static culture methods include experiments involving controlled, transient exposures to chemical stimuli. In static cultures, stimuli must be added and removed manually, and stimulus profiles are limited to step changes over time, while medium changes also add and remove other medium components, which can affect cells in an uncontrolled manner5. Fluidic systems can overcome these challenges, but existing devices pose other challenges. Microfluidic devices come with the prohibitive costs of specialized equipment and training to produce and use, require microanalytical methods to process samples, and cells are difficult to recover from the devices after perfusion6. Few macrofluidic systems have been created for the types of experiments described here7,8,9,10, and they are built of multiple custom parts made in-house and require multiple pumps or fraction collectors. Furthermore, the authors are not aware of any commercially available macrofluidic perfusion cell culture systems other than stirred tank bioreactors for suspension culture, which are useful for biomanufacturing, though are not designed for modeling and studying physiology.
The authors previously reported on the design of a low-cost perfusion bioreactor system composed almost entirely of commercially available parts11. The base version of the system enables multiple cultures in a well plate to be kept in a CO2 incubator and continuously perfused with medium from a syringe pump, while the effluent medium streams from the cultures are automatically fractionated into samples over time using a fraction collector with a custom modification. Thus, this system enables automated sampling of culture medium supernatant and continuous solute input to the cultures over time. The system is macrofluidic and modular and can be easily modified to meet the needs of novel experiment designs.
The overall goal of the method presented here is to construct, characterize, and use a perfusion cell culture system that enables experiments in which the secretion or absorption rates of substances by cells over time is measured, and/or cells are exposed to precise, transient solute signals. This video article explains how to assemble the base setup, which is capable of perfusing up to six cell cultures simultaneously using a single syringe pump and modified fraction collector. Two useful variants on the base system that make use of additional pumps and parts to allow for experiments that expose cells to transient solute concentration signals, including brief pulses and pharmacokinetic-like profiles12, are also presented, shown in Figure 1.
<img alt="Figure 1" class="xfigimg" src="/files/ftp_upload/63935/63935fig01.jpg" /> 
Figure 1: Three variations on the perfusion system design. (Top) The basic perfusion system. (Middle) The perfusion system with a stopcock for multiple medium sources. (Bottom) The perfusion system with a stirred tank to mimic a well-mixed volume of distribution. <a href="https://www.jove.com/files/ftp_upload/63935/63935fig01large.jpg" target="_blank">Please click here to view a larger version of this figure.</a>
Due to dispersion and diffusion within the flow, the solute signals become distorted or &#34;smeared&#34; as they travel through the flow system. This distortion can be quantified through the use of residence time distributions (RTDs)13. This article explains how to perform tracer experiments on components of the perfusion system (Figure 2), and provides MATLAB scripts to generate RTDs from measured data. A detailed explanation of this analysis can be found in the authors&#39; previous paper11. Additional MATLAB scripts fit appropriate functions to the RTDs and extract physical parameters, and perform signal convolution using RTDs to predict how solute signal input by the user will propagate and distort through the perfusion system14.
<img alt="Figure 2" class="xfigimg" src="/files/ftp_upload/63935/63935fig02.jpg" /> 
Figure 2: Residence time distributions. The RTDs of flow system components, such as this length of tubing, are measured by inputting a pulse of tracer to the system and measuring how it &#34;smears&#34; by the time it exits into the collected fractions. This figure has been modified from Erickson et al.11. <a href="https://www.jove.com/files/ftp_upload/63935/63935fig02large.jpg" target="_blank">Please click here to view a larger version of this figure.</a>

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>18 Gauge 1 1/2- in Disposable Probe Needle For Use With Syringes and Dispensing Machines</td>
			<td>Grainger</td>
			<td>5FVK2</td>
			<td></td>
		</tr>
		<tr>
			<td>293T Cells</td>
			<td>ATCC</td>
			<td>CRL-3216</td>
			<td>HEK 293T cells used in the Representative Results experiment.</td>
		</tr>
		<tr>
			<td>96-Well Clear Bottom Plates, Corning</td>
			<td>VWR</td>
			<td>89091-010</td>
			<td>Plates for measuring dye concentrations in RTD experiments and GLuc in representative results experiment.</td>
		</tr>
		<tr>
			<td>BD&#160;Disposable Syringes with Luer-Lok Tips, 5 mL</td>
			<td>Fisher Scientific</td>
			<td>14-829-45</td>
			<td></td>
		</tr>
		<tr>
			<td>BioFrac Fraction Collector&#160;</td>
			<td>Bio-Rad</td>
			<td>7410002</td>
			<td>Fraction collector that can be used for a single stream, or modified using our method to enable collection from multiple streams.</td>
		</tr>
		<tr>
			<td>Clear High-Strength UV-Resistant Acrylic 12&#34; x 12&#34; x 1/8&#34;</td>
			<td>McMaster-Carr</td>
			<td>4615T93</td>
			<td>This sheet is cut using a laser cutter according to the DXF file in the supplemental materials to produce the multi-head dispenser that can be attached to the BioFrac fraction collector.</td>
		</tr>
		<tr>
			<td>Coelenterazine native</td>
			<td>NanoLight Technology</td>
			<td>303</td>
			<td>Substrate used in Gaussia luciferase bioluminescence assay in representative results.</td>
		</tr>
		<tr>
			<td>Corning Costar TC-Treated Multiple Well Plates, size 48&#160;wells, polystyrene plate, flat bottom wells</td>
			<td>Millipore Sigma</td>
			<td>CLS3548</td>
			<td>Used to grow and perfuse 293T cells in representative results.</td>
		</tr>
		<tr>
			<td>Corning&#160;Costar Flat Bottom Cell Culture Plates, size 12 wells</td>
			<td>Fisher Scientific</td>
			<td>720081</td>
			<td>Can be plugged and used as a stirred tank to produce pharmacokinetic profiles in perfusion. Can also contain cells for perfusion.</td>
		</tr>
		<tr>
			<td>DMEM, high glucose</td>
			<td>ThermoFisher Scientific</td>
			<td>11965126</td>
			<td></td>
		</tr>
		<tr>
			<td>Epilog Zing 24 Laser</td>
			<td>Cutting Edge Systems</td>
			<td>Epilog Zing 24</td>
			<td>Laser cutter used to produce multi-head dispenser from acrylic sheet. Other laser cutters may be used.</td>
		</tr>
		<tr>
			<td>Fisherbrand Sterile Syringes for Single Use, Luer-Lock, 20 mL</td>
			<td>Fisher Scientific</td>
			<td>14-955-460</td>
			<td></td>
		</tr>
		<tr>
			<td>Fisherbrand Sterile Syringes for Single Use, Luer-Lock, 60 mL</td>
			<td>Fisher Scientific</td>
			<td>14-955-461</td>
			<td></td>
		</tr>
		<tr>
			<td>Fisherbrand Premium Microcentrifuge Tubes: 1.5mL</td>
			<td>Fisher Scientific</td>
			<td>05-408-129</td>
			<td>Microcentrifuge tubes for collecting fractions.</td>
		</tr>
		<tr>
			<td>Fisherbrand&#160;Round Bottom Disposable Borosilicate Glass Tubes with Plain End</td>
			<td>Fisher Scientific</td>
			<td>14-961-26</td>
			<td>Glass tubes for collecting fractions.</td>
		</tr>
		<tr>
			<td>Fisherbrand&#160;SureOne Micropoint Pipette Tips, Universal Fit, Non-Filtered</td>
			<td>Fisher Scientific</td>
			<td>2707410</td>
			<td>300 ul pipette tips that best fit the multi-head dispenser and tubing to act as dispensing tips.</td>
		</tr>
		<tr>
			<td>Gibco&#160;DPBS, powder, no calcium, no magnesium</td>
			<td>Fisher Scientific</td>
			<td>21600010</td>
			<td>Phosphate buffered saline.</td>
		</tr>
		<tr>
			<td>Labline 4625 Titer Shaker</td>
			<td>Marshall Scientific</td>
			<td>Labline 4625 Titer Shaker</td>
			<td>Orbital shaker used to keep stirred tanks mixed.</td>
		</tr>
		<tr>
			<td>Masterflex Fitting, Polycarbonate, Four-Way Stopcock, Male Luer Lock, Non-Sterile; 10/PK</td>
			<td>Cole-Parmer</td>
			<td>EW-30600-04</td>
			<td>Used to join multiple inlet streams for RTD experiments and cell culture experiments.</td>
		</tr>
		<tr>
			<td>Masterflex Fitting, Polycarbonate, Straight, Female Luer x Cap; 25/PK</td>
			<td>Masterflex</td>
			<td>UX-45501-28</td>
			<td></td>
		</tr>
		<tr>
			<td>Masterflex Fitting, Polypropylene, Straight, Female Luer to Hosebarb Adapters, 1/16&#34;</td>
			<td>Cole-Parmer</td>
			<td>EW-45508-00</td>
			<td></td>
		</tr>
		<tr>
			<td>Masterflex Fitting, Polypropylene, Straight, Male Luer Lock to Hosebarb Adapter, 1/16&#34; ID</td>
			<td>Cole-Parmer</td>
			<td>EW-45518-00</td>
			<td></td>
		</tr>
		<tr>
			<td>Masterflex Fitting, Polypropylene, Straight, Male Luer Lock to Plug Adapter; 25/PK</td>
			<td>Masterflex</td>
			<td>EW-30800-30</td>
			<td></td>
		</tr>
		<tr>
			<td>Masterflex L/S Precision Pump Tubing, Platinum-Cured Silicone, L/S 14; 25 ft</td>
			<td>Masterflex</td>
			<td>EW-96410-14</td>
			<td></td>
		</tr>
		<tr>
			<td>MATLAB</td>
			<td>MathWorks</td>
			<td>R2019b</td>
			<td>Version R2019b. Newer versions may also be used. Some older versions may work.</td>
		</tr>
		<tr>
			<td>NE-1600 Six Channel Programmable Syringe Pump</td>
			<td>New Era Pump Systems</td>
			<td>NE-1600</td>
			<td></td>
		</tr>
		<tr>
			<td>Rack Set F1</td>
			<td>Bio-Rad</td>
			<td>7410010</td>
			<td>Racks to hold collecting tubes in the fraction collector.</td>
		</tr>
		<tr>
			<td>Recombinant Human TNF-alpha (HEK293-expressed) Protein, CF</td>
			<td>Bio-Techne</td>
			<td>10291-TA-020</td>
			<td>Cytokine used to stimulate 293T cells in representative results.</td>
		</tr>
		<tr>
			<td>Saint Gobain Solid Stoppers, Versilic Silicone, Size: 00, Bottom 10.5mm</td>
			<td>Saint Gobain</td>
			<td>DX263015-50</td>
			<td>Fits 48-well plates.</td>
		</tr>
		<tr>
			<td>Saint Gobain Solid Stoppers, Versilic Silicone, Size: 4 Bottom 21mm</td>
			<td>Saint Gobain</td>
			<td>DX263027-10</td>
			<td>Fits 12-well plates.</td>
		</tr>
		<tr>
			<td>Sodium Hydroxide, 10.0 N Aqueous Solution APHA; 1 L</td>
			<td>Spectrum Chemicals</td>
			<td>S-395-1LT</td>
			<td></td>
		</tr>
		<tr>
			<td>SolidWorks</td>
			<td>Dassault Systems</td>
			<td>SolidWorks</td>
			<td>CAD software used to create the multi-head dispenser DXF file.</td>
		</tr>
		<tr>
			<td>Varioskan LUX multimode microplate reader</td>
			<td>ThermoFisher Scientific</td>
			<td>VL0000D0</td>
			<td>Plate reader.</td>
		</tr>
		<tr>
			<td>Wilton Color Right Performance Color System Base Refill, Blue</td>
			<td>Michaels</td>
			<td>10404779</td>
			<td>Blue food dye containing Brilliant Blue FCF, used as a tracer in RTD experiments. Absorbance spectrum peaks at 628 nm.</td>
		</tr>
	</tbody>
</table>

multi-stream perfusion bioreactor integrated with outlet fractionation for dynamic cell culture

Certain cell and tissue functions operate within the dynamic time scale of minutes to hours that are poorly resolved by conventional culture systems. This work has developed a low-cost perfusion bioreactor system that allows culture medium to be continuously perfused into a cell culture module and fractionated in a downstream module to measure dynamics on this scale. The system is constructed almost entirely from commercially available parts and can be parallelized to conduct independent experiments in conventional multi-well cell culture plates simultaneously. This video article demonstrates how to assemble the base setup, which requires only a single multichannel syringe pump and a modified fraction collector to perfuse up to six cultures in parallel. Useful variants on the modular design are also presented that allow for controlled stimulation dynamics, such as solute pulses or pharmacokinetic-like profiles. Importantly, as solute signals travel through the system, they are distorted due to solute dispersion. Furthermore, a method for measuring the residence time distributions (RTDs) of the components of the perfusion setup with a tracer using MATLAB is described. RTDs are useful to calculate how solute signals are distorted by the flow in the multi-compartment system. This system is highly robust and reproducible, so basic researchers can easily adopt it without the need for specialized fabrication facilities.

The perfusion system with multiple medium sources from section 5 of the protocol was used to measure the expression dynamics of a reporter gene driven by the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-&#954;B) transcription factor in human embryonic kidney 293 (HEK293) cells in response to a 1.5 h pulse of tumor necrosis factor alpha (TNF-&#945;). HEK293 cells were stably transduced using lentiviral vectors with a gene construct containing Gaussia luciferase (GLuc), driven by a promoter called NFK...

Watch this Scientific Journal Video about Multi-Stream Perfusion Bioreactor Integrated with Outlet Fractionation for Dynamic Cell Culture at JoVE.com

Multi-Stream Perfusion Bioreactor Integrated with Outlet Fractionation for Dynamic Cell Culture

This paper presents a method to construct and operate a low-cost, multichannel perfusion cell culture system for measuring the dynamics of secretion and absorption rates of solutes in cellular processes. The system can also expose cells to dynamic stimulus profiles.

Certain cell and tissue functions operate within the dynamic time scale of minutes to hours that are poorly resolved by conventional culture systems. This ...

This method helps understand how secretion rates change with time and how cells respond to time varying solid signals. The main advantages of this technique are that its low cost, requires little training and the profusion system setup can be adapted for novel experiments. Begin by filling one syringe with a background solution and load it into the first syringe pump.Fill another syringe with tracer solution and load it into the second syringe pump. Connect both syringes to two of the three ports of a four-way stopcock using luer connectors. Close the stopcock to the background solution and pump the tracer solution into the stopcock until it drips out the open port.Stop the pump and do not adjust the syringe further. Ensure that the syringe pumps moving bar is pushed up against the syringe plungers so that the flow begins immediately when the pump is started. Close the stopcock to the tracer solution and pump the background solution into the stopcock until all residual tracer solution has been flushed out of the open port.Stop the pump and do not adjust the syringe further. Set up the flow system component desired for RTD analysis. Insert the end into a pipette tip dispenser and pump background solution through the component until it is entirely filled.Set the pump for the tracer solution to the desired flow rate. Close the stopcock to the background solution and start the flow of the tracer solution. At the same time, start the fraction collector.Continue the flow of tracer solution for a short period of time to approximate an impulse input of the tracer. A pulse duration of 10 minutes is recommended for RTDs at a flow rate of one milliliter per hour. Stop the tracer solution pump at the end of the tracer solution pulse period.Quickly close the stopcock to the tracer solution and start the flow of the background solution at the same flow rate. Allow the background solution to flow and collect fractions until all of the tracer has passed through the system and into the collected fractions. Under sterile conditions, insert the stoppers with needles into the well plate cultures with the needles pulled up.After the stopper is in place, lower the needles to the desired height for perfusion as the height of the outlet needle determines the stable liquid level. Cap the needles with male luer caps and keep the whole wellplate in an incubator set at 37 degrees Celsius until use. Prepare the two media to be used for perfusion, labeling the medium that will be dispensed first as one and the other medium two.For each culture to be perfused, fill one syringe with medium one to last the whole duration of its dispension plus enough volume to initially fill the perfusion system. Fill a second syringe with medium two to last the whole duration of its dispension. Connect both syringes to two of the three ports of a four way stopcock.A length of tubing to connect the syringes to the stopcocks may be required. Prepare the stopcocks by closing the stopcock for medium one and dispensing medium two into the stopcock until it just begins to drip out the open port. Then close the stopcock for medium two and dispense medium one into the stopcock until all residual medium two has been flushed out of the open port.Attach the upstream tubing to the open stopcock port using a female to barb luer connector. Insert a male to barb luer connector on the other end of the tube. Dispense medium one from the syringe until the upstream tube is filled with medium and proceed with the preparation of downstream tubing as demonstrated earlier.Insert a male to barb luer connector into one end of the downstream tubing and cap it with a female luer cap. Carefully bring all prepared tubing, syringes and the well plate to the incubator that will be used for perfusion. Place the syringe pump and fraction collector in the desired locations near the incubator.Place the syringe pump on top of or near the incubator and place the fraction collector next to the incubator near the port. Load the syringes into the pump. Bundle together the capped ends of all the upstream and downstream tubes and push them from the outside of the incubator to the inside through the port.Insert the open ends of the downstream tubes into the dispensing pipette tips of the fraction collector's multi-head dispenser. Inside the incubator, pull as much slack of the upstream tubes as possible into the incubator to maximize the length of tubing through which the flowing medium can receive heat and carbon dioxide. For each plugged well, quickly uncap the needles and the upstream and downstream tubes for that well, then attach them together with their luer connectors.Once all parts are connected, briefly run the syringe pump at a relatively high speed to ensure that all streams are flowing properly. At this point, if it is desired to begin the experiment with the downstream tubes full of the medium, continue running the pump until all are filled, otherwise, stop the pump. Set the syringe pump flow rate for medium one and the frequency of fraction collection and start both machines simultaneously to begin the experiment.When the medium source needs to be changed, quickly stop the syringe pump for medium one. Turn the stopcock closed to medium one and start the syringe pump for medium two. If desired later, switch the source back to medium one similarly.Collect fractions for the desired experiment duration. The tracer concentrations in the fractions from two RTD experiments were measured and input into the RTD from data MATLAB script to produce the two RTDs. Single tubes and multiple pieces of tubing in series fit well by a single axial dispersion model and adding a perfused 48 well plate in line caused negligible deviation allowing both the one meter tube RTD and the entire system's RTD to fit by axial dispersion functions.An example of a poor model fit was demonstrated using the axial dispersion model fitted to the one meter tube RTD data and was plotted alongside the data. The initial parameter guesses were changed to produce a good model fit where tau was approximately equal to the perfusion system volume divided by its volumetric flow rate. A 90 minute pulse of TNF-alpha was defined as the input signal to the system and was convolved with the one meter tubing RTD to determine the TNF-alpha signal at the well plate inlet.The input signal was also convolved with the RTD of the entire system to determine the TNF-alpha signal at the outlet of the system in the collected fractions. HEK 293 cells were engineered to secrete GLuc driven by a promoter containing the NF-kappaB response element. The experiment revealed a significant expression increase and slow decrease in GLuc expression driven by NF-kappaB following TNF-alpha exposure.Variations of the system are described in accompanying paper, including a simpler setup for experiments that don't require inputting signals and exposing cells to pharma-hu connective solute profiles.

multi-stream-perfusion-bioreactor-integrated-with-outlet

Research

JoVE Journal

Bioengineering

Microfabricated Platforms for Mechanically Dynamic Cell Culture

The ability to systematically probe in vitro cellular response to combinations of mechanobiological stimuli for tissue engineering, drug discovery or fundamental cell biology studies is limited by current bioreactor technologies, which cannot simultaneously apply a variety of mechanical stimuli to cultured cells. In order to address this issue, we have developed a series of microfabricated platforms designed to screen for the effects of mechanical stimuli in a high-throughput format. In this protocol, we demonstrate the fabrication of a microactuator array of vertically displaced posts on which the technology is based, and further demonstrate how this base technology can be modified to conduct high-throughput mechanically dynamic cell culture in both two-dimensional and three-dimensional culture paradigms.

In this protocol, we demonstrate the fabrication of a microactuator array of vertically displaced posts on which the technology is based, and how this base technology can be modified to conduct high-throughput mechanically dynamic cell culture in both two-dimensional and three-dimensional culture paradigms.

The ability to systematically probe in vitro cellular response to combinations of mechanobiological stimuli for tissue engineering, drug discovery or ...

Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions

Cryo-electron tomography (cryoET) allows 3D visualization of cellular structures at molecular resolution in a close-to-physiological state1. However, direct visualization of individual viral complexes in their host cellular environment with cryoET is challenging2, due to the infrequent and dynamic nature of viral entry, particularly in the case of HIV-1. While time-lapse live-cell imaging has yielded a great deal of information about many aspects of the life cycle of HIV-13-7, the resolution afforded by live-cell microscopy is limited (~ 200 nm). Our work was aimed at developing a correlation method that permits direct visualization of early events of HIV-1 infection by combining live-cell fluorescent light microscopy, cryo-fluorescent microscopy, and cryoET. In this manner, live-cell and cryo-fluorescent signals can be used to accurately guide the sampling in cryoET. Furthermore, structural information obtained from cryoET can be complemented with the dynamic functional data gained through live-cell imaging of fluorescent labeled target.
In this video article, we provide detailed methods and protocols for structural investigation of HIV-1 and host-cell interactions using 3D correlative high-speed live-cell imaging and high-resolution cryoET structural analysis. HeLa cells infected with HIV-1 particles were characterized first by confocal live-cell microscopy, and the region containing the same viral particle was then analyzed by cryo-electron tomography for 3D structural details. The correlation between two sets of imaging data, optical imaging and electron imaging, was achieved using a home-built cryo-fluorescence light microscopy stage. The approach detailed here will be valuable, not only for study of virus-host cell interactions, but also for broader applications in cell biology, such as cell signaling, membrane receptor trafficking, and many other dynamic cellular processes.

We describe a correlative microscopy method that combines high-speed 3D live-cell fluorescent light microscopy and high-resolution cryo-electron tomography. We demonstrate the capability of the correlative method by imaging dynamic, small HIV-1 particles interacting with host HeLa cells.

Cryo-electron tomography (cryoET) allows 3D visualization of cellular structures at molecular resolution in a close-to-physiological state1. However, ...

Operation of a Benchtop Bioreactor

Fermentation systems are used to provide an optimal growth environment for many different types of cell cultures. The ability afforded by fermentors to carefully control temperature, pH, and dissolved oxygen concentrations in particular makes them essential to efficient large scale growth and expression of fermentation products. This video will briefly describe the advantages of the fermentor over the shake flask. It will also identify key components of a typical benchtop fermentation system and give basic instruction on setup of the vessel and calibration of its probes. The viewer will be familiarized with the sterilization process and shown how to inoculate the growth medium in the vessel with culture. Basic concepts of operation, sampling, and harvesting will also be demonstrated. Simple data analysis and system cleanup will also be discussed.

Fermentors are used to increase culture yield and productivity of bioengineered cells. After screening multiple microbial or animal cell culture candidates in shake flasks, the next logical step is to increase the selected culture&#x2019;s biomass with the fermentor. This video demonstrates the setup and operation of a typical benchtop bioreactor system.

Fermentation systems are used to provide an optimal growth environment for many different types of cell cultures. The ability afforded by fermentors to ...

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance

Organs-on-chips, in vitro models involving the culture of (human) tissues inside microfluidic devices, are rapidly emerging and promise to provide useful research tools for studying human health and disease. To characterize the barrier function of cell layers cultured inside organ-on-chip devices, often transendothelial or transepithelial electrical resistance (TEER) is measured. To this end, electrodes are usually integrated into the chip by micromachining methods to provide more stable measurements than is achieved with manual insertion of electrodes into the inlets of the chip. However, these electrodes frequently hamper visual inspection of the studied cell layer or require expensive cleanroom processes for fabrication. To overcome these limitations, the device described here contains four easily integrated electrodes that are placed and fixed outside of the culture area, making visual inspection possible. Using these four electrodes the resistance of six measurement paths can be quantified, from which the TEER can be directly isolated, independent of the resistance of culture medium-filled microchannels. The blood-brain barrier was replicated in this device and its TEER was monitored to show the device applicability. This chip, the integrated electrodes and the TEER determination method are generally applicable in organs-on-chips, both to mimic other organs or to be incorporated into existing organ-on-chip systems.

This publication describes the fabrication of an organ-on-chip device with integrated electrodes for direct quantification of transendothelial electrical resistance (TEER). For validation, the blood-brain barrier was mimicked inside this microfluidic device and its barrier function was monitored. The presented methods for electrode integration and direct TEER quantification are generally applicable.

Organs-on-chips, in vitro models involving the culture of (human) tissues inside microfluidic devices, are rapidly emerging and promise to provide useful ...

Construction of a Multilayered Mesenchymal Stem Cell Sheet with a 3D Dynamic Culture System

Stem cell therapy shows a promising future in regenerating injured organ and tissues, and the cell sheet technique has been developed to improve the low cell retention and poor survival within the target zone. However, during the in vitro construction process, a solution for maintaining stem cell bioactivity and increasing the cell amount within the cell sheet is urgently needed. Here, this protocol presents a method for constructing a multilayered cell sheet with favorable stem cell bioactivity and optimal operability. Decellularized porcine pericardium (DPP) is prepared by phospholipase A2 (PLA2) decellularization method as the cell sheet scaffold, and rat bone marrow mesenchymal stem cells (BMSCs) are isolated and expanded as the seeded cells. The temporary multilayered cell sheet structure is constructed by using RAD16-I peptide hydrogel. Finally, the cell sheet is cultured with a dynamic perfusion system to stabilize the three-dimensional (3D) structure, and the cell sheet could be obtained following a 48-hour culture in vitro. This protocol provides an efficient and feasible method for constructing a multilayered stem cell sheet, and the cell sheet could be developed as a favorable stem cell therapy product in the future.

This article provides an efficient and feasible method for constructing multilayered stem cell sheets with favorable stem cell property.

Stem cell therapy shows a promising future in regenerating injured organ and tissues, and the cell sheet technique has been developed to improve the low ...

A Microfluidic Platform for Stimulating Chondrocytes with Dynamic Compression

Mechanical stimuli are known to modulate biological functions of cells and tissues. Recent studies have suggested that compressive stress alters growth plate cartilage architecture and results in growth modulation of long bones of children. To determine the role of compressive stress in bone growth, we created a microfluidic device actuated by pneumatic pressure, to dynamically (or statically) compress growth plate chondrocytes embedded in alginate hydrogel cylinders. In this article, we describe detailed methods for fabricating and characterizing this device. The advantages of our protocol are: 1) Five different magnitudes of compressive stress can be generated on five technical replicates in a single platform, 2) It is easy to visualize cell morphology via a conventional light microscope, 3) Cells can be rapidly isolated from the device after compression to facilitate downstream assays, and 4) The platform can be applied to study mechanobiology of any cell type that can grow in hydrogels.

This article provides detailed methods for fabricating and characterizing a pneumatically actuating microfluidic device for chondrocyte compression.

Mechanical stimuli are known to modulate biological functions of cells and tissues. Recent studies have suggested that compressive stress alters growth ...

Traction Microscopy Integrated with Microfluidics for Chemotactic Collective Migration

Cells change migration patterns in response to chemical stimuli, including the gradients of the stimuli. Cellular migration in the direction of a chemical gradient, known as chemotaxis, plays an important role in development, the immune response, wound healing, and cancer metastasis. While chemotaxis modulates the migration of single cells as well as collections of cells in vivo, in vitro research focuses on single-cell chemotaxis, partly due to the lack of the proper experimental tools. To fill that gap, described here is a unique experimental system that combines microfluidics and micropatterning to demonstrate the effects of chemical gradients on collective cell migration. Furthermore, traction microscopy and monolayer stress microscopy are incorporated into the system to characterize changes in cellular force on the substrate as well as between neighboring cells. As proof-of-concept, the migration of micropatterned circular islands of Madin-Darby canine kidney (MDCK) cells is tested under a gradient of hepatocyte growth factor (HGF), a known scattering factor. It is found that cells located near the higher concentration of HGF migrate faster than those on the opposite side within a cell island. Within the same island, cellular traction is similar on both sides, but intercellular stress is much lower on the side of higher HGF concentration. This novel experimental system can provide new opportunities to studying the mechanics of chemotactic migration by cellular collectives.

Collective cell migration in development, wound healing, and cancer metastasis is often guided by the gradients of growth factors or signaling molecules. Described here is an experimental system combining traction microscopy with a microfluidic system and a demonstration of how to quantify the mechanics of collective migration under biochemical gradient.

Cells change migration patterns in response to chemical stimuli, including the gradients of the stimuli. Cellular migration in the direction of a chemical ...

Imaging-Guided Bioreactor for Generating Bioengineered Airway Tissue

Repeated injury to airway tissue can impair lung function and cause chronic lung disease, such as chronic obstructive pulmonary disease. Advances in regenerative medicine and bioreactor technologies offer opportunities to produce lab-grown functional tissue and organ constructs that can be used to screen drugs, model disease, and engineer tissue replacements. Here, a miniaturized bioreactor coupled with an imaging modality that allows in situ visualization of the inner lumen of explanted rat trachea during in vitro tissue manipulation and&#160;culture is described. Using this bioreactor, the protocol demonstrates imaging-guided selective removal of endogenous cellular components while preserving the intrinsic biochemical features and ultrastructure of the airway tissue matrix. Furthermore, the delivery, uniform distribution, and subsequent prolonged culture of exogenous cells on the decellularized airway lumen with optical monitoring in situ are shown. The results highlight that the imaging-guided bioreactor can potentially be used to facilitate the generation of functional in vitro airway tissues.

The protocol describes an imaging-enabled bioreactor that allows the selective removal of the endogenous epithelium from the rat trachea and homogenous distribution of exogenous cells on the lumen surface, followed by long-term in vitro culture of the cell-tissue construct.

Repeated injury to airway tissue can impair lung function and cause chronic lung disease, such as chronic obstructive pulmonary disease. Advances in ...

Procurement and Perfusion-Decellularization of Porcine Vascularized Flaps in a Customized Perfusion Bioreactor

Large volume soft tissue defects lead to functional deficits and can greatly impact the patient&#39;s quality of life. Although surgical reconstruction can be performed using autologous free flap transfer or vascularized composite allotransplantation (VCA), such methods also have disadvantages. Issues such as donor site morbidity and tissue availability limit autologous free flap transfer, while immunosuppression is a significant limitation of VCA. Engineered tissues in reconstructive surgery using decellularization/recellularization methods represent a possible solution. Decellularized tissues are generated using methods that remove native cellular material while preserving the underlying extracellular matrix (ECM) microarchitecture. These acellular scaffolds can then be subsequently recellularized with recipient-specific cells.
This protocol details the procurement and decellularization methods used to achieve acellular scaffolds in a pig model. In addition, it also provides a description of the perfusion bioreactor design and setup. The flaps include the porcine omentum, tensor fascia lata, and the radial forearm. Decellularization is performed via ex vivo perfusion of low concentration sodium dodecyl sulfate (SDS) detergent followed by DNase enzyme treatment and peracetic acid sterilization in a customized perfusion bioreactor.
Successful tissue decellularization is characterized by a white-opaque appearance of flaps macroscopically. Acellular flaps show the absence of nuclei on histological staining and a significant reduction in DNA content. This protocol can be used efficiently to generate decellularized soft tissue scaffolds with preserved ECM and vascular microarchitecture. Such scaffolds can be used in subsequent recellularization studies and have the potential for clinical translation in reconstructive surgery.

The protocol describes the surgical procurement and subsequent decellularization of vascularized porcine flaps by the perfusion of sodium dodecyl sulfate detergent through the flap vasculature in a customized perfusion bioreactor.

Large volume soft tissue defects lead to functional deficits and can greatly impact the patient&#39;s quality of life. Although surgical reconstruction ...

Procurement and Decellularization of Rat Hindlimbs Using an Ex Vivo Perfusion-Based Bioreactor for Vascularized Composite Allotransplantation

Patients with severe traumatic injuries and tissue loss require complex surgical reconstruction. Vascularized composite allotransplantation (VCA) is an evolving reconstructive avenue for transferring multiple tissues as a composite subunit. Despite the promising nature of VCA, the long-term immunosuppressive requirements are a significant limitation due to the increased risk of malignancies, end-organ toxicity, and opportunistic infections. Tissue engineering of acellular composite scaffolds is a potential alternative in reducing the need for immunosuppression. Herein, the procurement of a rat hindlimb and its subsequent decellularization using sodium dodecyl sulfate (SDS) is described. The procurement strategy presented is based upon the common femoral artery. A machine perfusion-based bioreactor system was constructed and used for ex vivo decellularization of the hindlimb. Successful perfusion decellularization was performed, resulting in a white translucent-like appearance of the hindlimb. An intact, perfusable, vascular network throughout the hindlimb was observed. Histological analyses showed the removal of nuclear contents and the preservation of tissue architecture across all tissue compartments.

Procurement and Decellularization of Rat Hindlimbs Using an Ex Vivo Perfusion-Based Bioreactor for Vascularized Composite Allotransplantation

We describe the surgical technique and decellularization process for composite rat hindlimbs. Decellularization is conducted using low-concentration sodium dodecyl sulfate through an ex vivo machine perfusion system.

Patients with severe traumatic injuries and tissue loss require complex surgical reconstruction. Vascularized composite allotransplantation (VCA) is an ...