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1. Making organoids from a single-cell suspension
<ol>
	<li>In an ice bucket or cold block, place the laminin-rich extracellular matrix (lrECM) and a small centrifuge tube. Place the appropriate amount of lrECM (16 &#181;L x X number of intended organoids) into the small centrifuge tube.</li>
	<li>Create a mixture of cells in a total volume (4 &#181;L x X number of intended organoids) containing 20,000 cells/organoid and add this to the small centrifuge tube with lrECM on ice.</li>
	<li>Carefully pipette 20 &#181;L of the lrECM/cell suspension mixture onto parafilm molds, forming a pearl-like droplet.
	<ol>
		<li>Be sure to thoroughly mix the lrECM/cell suspension mixture, as the cells tend to settle easily within the lrECM, resulting in heterogeneous organoids.</li>
		<li>Keep the lrECM/cell suspension mixture on ice. If lrECM warms, it can polymerize and compromise organoid formation.</li>
		<li>Be sure to cool the pipette tip every two to three organoids to prevent lrECM polymerization. Do not introduce air bubbles into organoids (avoid &#34;double pushing&#34; the pipette tip).</li>
	</ol>
	</li>
	<li>Once the desired number of organoids are pipetted onto parafilm mold in a 10 cm culture plate, incubate at 37 &#176;C for 1-2 h in a cell culture incubator.</li>
	<li>After organoids solidify, Neurobasal Media Complete (NBMc) media (Table 1) is used to flush them gently off the parafilm mold and into a new, sterile 10 cm culture plate with 20 mL of NBMc total. Using a Pipette-1000 (p1000) tip works best to flush organoids off the mold; they will slide off gently. 
	NOTE: About 15-20 organoids per 10 cm culture dish is recommended.</li>
	<li>Place the 10 cm culture dish in an incubator (without shaking) for 4 days.</li>
	<li>After 4 days (Figure 1), exchange the media and place it on an orbital shaker at 80 RPM in the cell culture incubator. Exchange media every 2-3 days thereafter.
	<ol>
		<li>Exchanging media with immature organoids is challenging because they are difficult to visualize. Tilt the cell culture dish and wait for at least 20 seconds; the organoids will settle at the bottom, and allow the media from above to be removed slowly with a large opening glass pipette.</li>
		<li>Pay careful attention to the collection of organoids at the bottom; if they appear stirred up with the force of media removal, pause and allow them to resettle. As organoids mature and are easier to visualize, this process becomes less nuanced. 
		NOTE: Sometimes, placing a piece of dark paper beneath the cell culture plate can help visualize immature organoids. Do not use a Pasteur pipette with vacuum suction to remove media, as it is very easy for the organoids to be sucked up and lost this way.</li>
		<li>When organoids are first established, they do not consume media as rapidly as mature organoids. Begin with 50% media exchanges to reduce unnecessary media use and reduce the chance of accidentally damaging or aspirating new organoids during the media exchange process.</li>
	</ol>
	</li>
</ol>
Table 1: Neurobasal medium complete (NBMc) formulation
<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>Component</td>
			<td>Quantity</td>
		</tr>
		<tr>
			<td>Neurobasal medium minus phenol red</td>
			<td>500 mL</td>
		</tr>
		<tr>
			<td>B-27 supplement minus vitamin A (50x)</td>
			<td>10 mL</td>
		</tr>
		<tr>
			<td>Antibiotic-antimycotic (100x)</td>
			<td>5 mL</td>
		</tr>
		<tr>
			<td>Sodium pyruvate (100 mM)</td>
			<td>5 mL</td>
		</tr>
		<tr>
			<td>Glutamine in 0.85% NaCl (200 mM)</td>
			<td>5 mL</td>
		</tr>
		<tr>
			<td>Recombinant human FGF basic (250 &#181;g/mL)</td>
			<td>20 &#181;L</td>
		</tr>
		<tr>
			<td>Recombinant human EFG protein (250 &#181;g/mL)</td>
			<td>20 &#181;L</td>
		</tr>
		<tr>
			<td>Phenol red</td>
			<td>500 &#181;L</td>
		</tr>
	</tbody>
</table>

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>Antibiotic-antimycotic</td>
			<td>ThermoFisher Scientific</td>
			<td>15240062</td>
			<td>Antibiotic-antimycotic</td>
		</tr>
		<tr>
			<td>B-27 supplement minus vitamin A</td>
			<td>ThermoFisher Scientific</td>
			<td>12587001</td>
			<td>B-27 supplement minus vitamin A (50x)</td>
		</tr>
		<tr>
			<td>Matrigel</td>
			<td>ThermoFisher Scientific</td>
			<td>354234</td>
			<td>Laminin-enriched extracellular matrix</td>
		</tr>
		<tr>
			<td>Neurobasal media minus phenol red</td>
			<td>ThermoFisher Scientific</td>
			<td>12349015</td>
			<td>Neurobasal media minus phenol red (500 mL)</td>
		</tr>
		<tr>
			<td>Phenol red</td>
			<td>Sigma</td>
			<td>P0290</td>
			<td>Phenol red (0.5%)</td>
		</tr>
		<tr>
			<td>Recombinant human EGF protein</td>
			<td>R&#38;D systems</td>
			<td>236-EG-01M</td>
			<td>Recombinant human EGF protein (250 &#181;g/mL)</td>
		</tr>
		<tr>
			<td>Recombinant human FGF basic</td>
			<td>R&#38;D systems</td>
			<td>4144-TC-01</td>
			<td>Recombinant human FGF basic (250 &#181;g/mL)</td>
		</tr>
	</tbody>
</table>

generating an organoid culture from a brain tumor cell suspension

Source: Sundar, S. J. et al.&#160; <a href="https://app.jove.com/v/63745">Maintaining Human Glioblastoma Cellular Diversity Ex vivo using Three-Dimensional Organoid Culture.</a> J. Vis. Exp. (2022).
This video describes the preparation and cultivation of brain tumor organoids from single-cell suspension. Using a laminin-rich extracellular matrix as a scaffold and culture media for nutrients, cells are facilitated to multiply and self-organize within the organoid. Consequently, ex vivo organoids are generated, mimicking cellular diversity and the microenvironment of brain tumors.

<img alt="Figure 1" src="/files/ftp_upload/22422/22422_Figure1.jpg" /> 
Figure 1 shows early organoid growth seen via light microscopy at 10x magnification. Figure 1A shows the migration and invasion of single cells through lrECM in the center view. The cells will continue to expand and &#39;colonize&#39; the lrECM, and they will appear more dense and eventually opaque by visual inspection. Figure 1B shows several mature organoids (at 7 weeks) without magnif...

Generating an Organoid Culture from a Brain Tumor Cell Suspension

1. Making organoids from a single-cell suspension

	In an ice bucket or cold block, place the laminin-rich extracellular matrix (lrECM) and a small ...

Begin with a microcentrifuge tube containing a laminin-rich extracellular matrix or lrECM. Laminin is a structural component present abundantly in the brain.
Keep the tube on ice to prevent IrECM polymerization.
Add brain tumor cells and mix thoroughly to ensure a uniform distribution of cells.
Next, transfer the mixture onto parafilm molds, forming droplets.
Incubate to facilitate lrECM polymerization to form a scaffold, mimicking the cells&#39; natural environment.
Now, flush the solidified organoids into a Petri dish containing a culture medium, then incubate.
The culture medium provides essential nutrients and growth factors, supporting cell division.
Within the organoid, cells self-organize by migrating and invading.
After incubation, tilt the plate to settle the organoids.
Carefully remove the excess medium and add fresh medium.
Incubate with gentle shaking.
This distributes the nutrients evenly and enhances organoid growth.

generating-an-organoid-culture-from-a-brain-tumor-cell-suspension

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Neuroscience

Neuronal Culture Techniques

Advanced Neuronal Models

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Facilitating Cerebral Organoid Culture via Lateral Soft Light Illumination

At present, cerebral organoid culture technology is still complicated to operate and difficult to apply on a large scale. It is necessary to find a simple and practical solution. Therefore, a more feasible cerebral organoid protocol is proposed in the present study. To solve the unavoidable inconvenience in medium change and organoid transfer in the early stage, the current research optimizes the operation technology by applying the engineering principle. A soft light lamp was adopted to laterally illuminate the embryoid body (EB) samples, allowing the EBs to be seen by the naked eye through the enhanced diffuse reflection effect. Using the principle of secondary flow generated by rotation, the organoids gather toward the center of the well, which facilitates the operation of medium change or organoid transfer. Compared to the dispersed cell, the embryoid body settles faster in the pipette. Using this phenomenon, most of the free cells and dead cell fragments can be effectively removed in a simple way, preventing EBs from incurring damage from centrifugation. This study facilitates the operation of cerebral organoid culture and helps to promote the application of brain organoids.

Facilitating Cerebral Organoid Culture via Lateral Soft Light Illumination

Cerebral organoids provide unprecedented opportunities for studying organ development and human disease pathology. Although great success has been achieved with cerebral organoid culture systems, there are still operational difficulties in applying this technology. The present protocol describes a cerebral organoid procedure that facilitates medium change and organoid transfer.

Облегчение церебральной органоидной культуры с помощью бокового мягкого светового освещения

At present, cerebral organoid culture technology is still complicated to operate and difficult to apply on a large scale. It is necessary to find a simple ...

Generating an Organoid Culture from a Brain Tumor Cell Suspension

ТРАНСКРИПТ

Generating an Organoid Culture from a Brain Tumor Cell Suspension