1. Cell Culture and Scaffold Preparation
NOTE: Scaffolds should be prepared 48 h prior to implantation in mice. The following volumes are provided on a per-scaffold basis. Multiply quantities as needed for additional scaffolds.
<ol>
	<li>Cut poly(lactic acid) (PLA) scaffolds into resection cavity-sized (approximately 2 mm x 2 mm) pieces. Scaffolds can be cut by hand using scissors or using a hole punch for repeatability.</li>
	<li>Sterilize by immersing in 70% ethanol for 15 min followed by immersing in PBS. Place scaffold in Dulbecco's modified Eagle's medium (DMEM) containing 10% fetal bovine serum (FBS) and 1% penicillin-streptomycin while preparing cells for seeding.</li>
	<li>Lift cultured MSCs using 0.05% trypsin (3&#8211;5 mL for a T75 flask). Incubate at 37 &#176;C for 5 min. Ensure that the cells have lifted, then add 7&#8211;10 mL DMEM to the flask to inactivate trypsin.</li>
	<li>Transfer flask contents to a 15 mL centrifuge tube. Count cells using a hemocytometer. Pellet 5 x 105&#160;MSCs for each scaffold via centrifugation at 100 x g for 5 min.</li>
	<li>Aspirate off supernatant and resuspend MSCs in 5 &#181;L DMEM per 5 x 105&#160;cells.</li>
	<li>Prepare the scaffolds for seeding by patting them dry.
	<ol>
		<li>Remove a scaffold from DMEM immersion with forceps and temporarily place it on the lid of the 6-well plate. Lift the scaffold off the lid, leaving behind a droplet of excess DMEM.</li>
		<li>Place the scaffold back on the lid again in a new, dry location. Repeat 3&#8211;5 times, then place the partially dried scaffold in a new 6-well plate for seeding. Repeat for each scaffold. 
		NOTE: A partially dried scaffold provides optimal cell seeding results. If the scaffold is too wet, cells will slide off the scaffold and adhere to the well plate below. If the scaffold is too dry, the droplet will not spread over the entire scaffold, resulting in poor initial cell distribution.</li>
	</ol>
	</li>
	<li>Using a pipette, gently mix the vial of stem cells to homogenize the suspension as some cells may have settled to the bottom.</li>
	<li>Slowly pipette 2.5 &#181;L freshly mixed MSC suspension directly on the scaffold, creating a small droplet over the top of the scaffold.</li>
	<li>Add 300 &#181;L DMEM to edges of each well. This will prevent rapid evaporation of the cell droplet. Incubate at 37 &#176;C for 30 min, allowing the cells to attach to the scaffold.</li>
	<li>With forceps, gently flip the scaffolds over in the well plate. Seed 2.5 &#181;L freshly mixed MSC suspension (this results in a total of 5 x 105&#160;cells seeded per scaffold). Incubate at 37 &#176;C for 30 min, allowing the cells to attach to the scaffold.</li>
	<li>Cover the scaffolds in DMEM by adding 2 mL to each well of the 6-well plate. Gently lift the scaffolds to allow media to flow underneath them. Incubate at 37 &#176;C in this state for 48 h prior to implantation surgery.</li>
	<li>Check the scaffolds after 24 h and add/change media if excess evaporation or discolored media due to pH imbalance is observed.</li>
</ol>

msc seeded scaffold preparation: a technique to prepare scaffold seeded with mesenchymal stem cells for surgical implantation into murine model

MSC Seeded Scaffold Preparation: A Technique to Prepare Scaffold Seeded with Mesenchymal Stem Cells for Surgical Implantation into Murine Model

Source: Sheets, K. T. et al. <a href='https://www.jove.com/video/57452' target='_blank'>Image-Guided Resection of Glioblastoma and Intracranial Implantation of Therapeutic Stem Cell-seeded Scaffolds.</a> J. Vis. Exp. (2018)
This video describes the technique of seeding mesenchymal stem cells (MSCs) onto a biodegradable poly(lactic acid) (PLA) scaffold. The prepared scaffolds can be implanted into the surgical resection cavity of the brain from where they may migrate towards tumor foci. Further, these cells can be engineered to express therapeutic proteins to stimulate apoptosis in cancer cells.

Source: Sheets, K. T. et al. Image-Guided Resection of Glioblastoma and Intracranial Implantation of Therapeutic Stem Cell-seeded Scaffolds. J. Vis. Exp. ...

Cancer cells produce chemotactic homing factors to attract the mesenchymal stem cells or MSCs from the blood vessels towards the tumor location.
To study the effect of these cells on tumor growth in vitro, begin by taking a sterilized scaffold substrate. Transfer it to a well-plate containing desired media to pre-wet the scaffold. Place it on a dry surface to remove excess media sticking to the scaffold for better cell adhesion. Transfer the partially dried scaffold to a fresh well. Seed a drop of MSC suspension onto the scaffold.
Additionally, add more media in the corners of the well to create a hydration chamber that prevents media evaporation from the drop during subsequent incubation. Incubate to allow the MSCs to adhere to the surface of the scaffold. Flip over the scaffold to expose the non-seeded surface. Pipette a fresh drop of MSC suspension on this side and let MSCs adhere.
After MSCs have adhered to both sides of the scaffold, cover it with more media ensuring that all the cells are in contact with the media. Incubate till the MSCs grow and infiltrate within the interstices and pores of the scaffold. The MSC seeded scaffold is ready for surgical implantation.

Prepare the scaffolds 48 hours prior to implantation in mice by first cutting PLA scaffolds into resection cavity-sized pieces of approximately 2 by 2 millimeters. Sterilize the scaffolds by immersing in 70% ethanol for 15 minutes. After 15 minutes, immerse the scaffolds in PBS. Then, place the scaffolds in Dulbecco's Modified Eagle's Medium containing 10% fetal bovine serum and 1% penicillin-streptomycin while preparing cells for seeding.
To prepare the cells, first, lift cultured MSCs using 0.05% trypsin. Incubate at 37 degrees Celsius for 5 minutes. Following the incubation, ensure that the cells have lifted. Then, add DMEM to the flask to inactivate the trypsin. Next, transfer the flask contents to a 15-milliliter centrifuge tube. Count the cells using a hemocytometer. Then, pellet 5 times 10 to the fifth MSCs for each scaffold via centrifugation at 100 x g for 5 minutes.
Following the centrifugation, aspirate the supernatant and resuspend the MSCs in 5 microliters of DMEM per 5 times 10 to the fifth cells. Then, remove a scaffold from DMEM immersion with forceps and place it on the lid of the 6-well plate. Lift the scaffold off the lid, leaving behind a droplet of excess DMEM. Place the scaffold back on the lid again in a new dry location. Repeat three to five times. Then, place the partially dried scaffold in a new 6-well plate for seeding.
A partially dried scaffold provides optimal cell seeding results. If the scaffold is too wet, cells will slide off the scaffold and adhere to the plate below. If the scaffold is to dry, the droplet will not spread over the entire scaffold, resulting in poor initial cell distribution.
Using a pipette, gently mix the tube of MSCs to homogenize the suspension as some cells may have settled to the bottom. Slowly pipette 2.5 microliters of freshly mixed MSC suspension directly on the scaffold, creating a small droplet over the top of the scaffold. Add 300 microliters of DMEM to edges of each well to prevent rapid evaporation of the cell droplet. Incubate at 37 degrees Celsius for 30 minutes, allowing the cells to attach to the scaffold.
Following the incubation, use forceps to gently flip the scaffolds over in the well plate. Seed 2.5 microliters of freshly mixed MSC suspension to give a total of 5 times 10 to the fifth cells seeded per scaffold. After an incubation of 30 minutes to allow the cells to attach to the scaffold, cover the scaffolds in DMEM by adding 2 milliliters to each well of the 6-well plate. Gently lift the scaffolds to allow media to flow underneath them. Incubate at 37 degrees Celsius in this state for 48 hours prior to implantation surgery.

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3.3K Views. Cancer cells produce chemotactic homing factors to attract the mesenchymal stem cells or MSCs from the blood vessels towards the tumor location. To study the effect of these cells on tumor growth in vitro, begin by taking a sterilized scaffold substrate. Transfer it to a well-plate containing desired media to pre-wet the scaffold. Place it on a dry surface to remove excess media sticking to the scaffold for better cell adhesion. Transfer the partially dried scaffold to a fresh well. Se...

MSC Seeded Scaffold Preparation: A Technique to Prepare Scaffold Seeded with Mesenchymal Stem Cells for Surgical Implantation into Murine Model

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