Name: fluorescent orthotopic mouse model of pancreatic cancer
Uploaded: 2016-09-20T08:00:00
Description: Watch this Scientific Journal Video about Fluorescent Orthotopic Mouse Model of Pancreatic Cancer at JoVE.com

We thank the Western University of Health Sciences for the Intramural Grant.

The protocol described below is executed under guidance and approval of Western University&#39;s Animal Care and Use Committee. All experiments are performed in compliance with all relevant guidelines, regulation and regulatory agencies.
1. Cell Culture
<ol>
	<li>Preparation of Complete Medium
	<ol>
		<li>Using a Class II biological safety cabinet, prepare complete medium by aseptically adding fetal bovine serum (FBS) and penicillin streptomycin (P/S) to a 500 ml bottle of R...

<ol>
	<li>Smyth, E., Cunningham, D., Kasper, D., 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> Harrison's Principles of Internal Medicine. , (2015).</li><li>Mahipal, A., Frakes, J., Hoffe, S., Kim, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Management+of+borderline+resectable+pancreatic+cancer.">Management of borderline resectable pancreatic cancer.</a> World J Gastrointest Oncol. 7, 241-249 (2015).</li><li>De La Cruz, M. S., Young, A. P., Ruffin, M. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Diagnosis+and+management+of+pancreatic+cancer.">Diagnosis and management of pancreatic cancer.</a> Am Fam Physician. 89, 626-632 (2014).</li><li>Frese, K. K., Tuveson, D. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Maximizing+mouse+cancer+models.">Maximizing mouse cancer models.</a> Nat Rev Cancer. 7, 645-658 (2007).</li><li>Hoffman, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Patient-derived+orthotopic+xenografts:+better+mimic+of+metastasis+than+subcutaneous+xenografts.">Patient-derived orthotopic xenografts: better mimic of metastasis than subcutaneous xenografts.</a> Nat Rev Cancer. 15, 451-452 (2015).</li><li>Hoffman, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+multiple+uses+of+fluorescent+proteins+to+visualize+cancer+in+vivo.">The multiple uses of fluorescent proteins to visualize cancer in vivo.</a> Nat Rev Cancer. 5, 796-806 (2005).</li><li>Jiang, Y. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Establishment+of+an+orthotopic+pancreatic+cancer+mouse+model:+cells+suspended+and+injected+in+Matrigel.">Establishment of an orthotopic pancreatic cancer mouse model: cells suspended and injected in Matrigel.</a> World J Gastroenterol. 20, 9476-9485 (2014).</li><li>Arranz, A., Ripoll, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Advances+in+optical+imaging+for+pharmacological+studies.">Advances in optical imaging for pharmacological studies.</a> Front Pharmacol. 6, 189 (2015).</li><li>Metildi, C. A., Kaushal, S., Hoffman, R. M., Bouvet, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vivo+serial+selection+of+human+pancreatic+cancer+cells+in+orthotopic+mouse+models+produces+high+metastatic+variants+irrespective+of+Kras+status.">In vivo serial selection of human pancreatic cancer cells in orthotopic mouse models produces high metastatic variants irrespective of Kras status.</a> J Surg Res. 184, 290-298 (2013).</li><li>Kim, M. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Generation+of+orthotopic+and+heterotopic+human+pancreatic+cancer+xenografts+in+immunodeficient+mice.">Generation of orthotopic and heterotopic human pancreatic cancer xenografts in immunodeficient mice.</a> Nat Protoc. 4, 1670-1680 (2009).</li><li>Katz, M. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Survival+efficacy+of+adjuvant+cytosine-analogue+CS-682+in+a+fluorescent+orthotopic+model+of+human+pancreatic+cancer.">Survival efficacy of adjuvant cytosine-analogue CS-682 in a fluorescent orthotopic model of human pancreatic cancer.</a> Cancer Res. 64, 1828-1833 (2004).</li><li>Bouvet, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Real-time+optical+imaging+of+primary+tumor+growth+and+multiple+metastatic+events+in+a+pancreatic+cancer+orthotopic+model.">Real-time optical imaging of primary tumor growth and multiple metastatic events in a pancreatic cancer orthotopic model.</a> Cancer Res. 62, 1534-1540 (2002).</li></ol>

We describe an orthotopic murine model of pancreatic cancer which expresses GFP, thus allowing non-invasive monitoring of tumor growth using whole body in vivo fluorescent imaging (Figure 1). This technique allows us to monitor the tumor development in real time (Figure 3); it can be an important tool for researchers to study the therapeutic efficacy of novel agents against pancreatic cancer. Another important aspect of this model is that GFP fluorescence provides a visual cue i...

Pancreatic cancer is diagnosed with increased frequency compared to other cancers and is the 4th leading cause of cancer-related deaths in the United States. From the time of diagnosis, over 90% of patients die within five years 1,2. Currently, surgical tumor removal is the only cure for pancreatic cancer, but less than 20% of patients are eligible to undergo surgery mainly because at the time of diagnosis the disease is at an advanced stage and has metastasized 3,4. The lack of specific symptoms makes pancreatic cancer a silent disease; some of the symptoms include abdominal pain, back pain, loss of appetite, jaundice and nausea; which can be easily interpreted as common digestive illnesses 4. For this reason, it is important to develop new pharmacological tools to aid in the diagnosis and treatment of pancreatic cancer.
The use of animal models allows us to understand the biology of pancreatic cancer and provides an insight into applying this knowledge to humans. Xenograft orthotopic models of pancreatic cancer are realistic, because tumors grow in the organ of origin 5. In contrast to heterotopic models, where cell lines or tumor fragments are implanted subcutaneously, orthotopic modeling allows for the recreation of the tumor microenvironment and mimics the interaction of tumor cells with its surroundings 6. The xenograft model described here derives tumors from the human pancreatic cancer cell line PANC-1 GFP, which is genetically engineered to express the green fluorescent protein (GFP). GFP detection enables for a non-invasive imaging and monitoring of tumor growth and metastasis 7. Tumor development occurs rapidly, spontaneously, and closely resembles that of primary tumors of human pancreatic cancer patients 8. Orthotopic models provide a more accurate prediction of drug efficacy in response to therapeutic agents, while mimicking the tumor microenvironment.
As mentioned above, this animal model allows fluorescent detection of tumor growth and metastasis in real time. Fluorescent detection allows for a more direct/live imaging compared to luminescence. With fluorescence the emitted light is a result of an excitation by another light of a shorter wavelength; whereas in luminescence, the emitted light is the result of a chemical reaction and may not have strong emission9. Furthermore, whole body in vivo fluorescent imaging is not detrimental to the animal and allows researchers to monitor tumor growth over time in response to therapeutic treatments.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>RPMI media 1640&#160;</td>
			<td>Caisson Labs&#160;</td>
			<td>RPL03-500ML</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal Bovine Serum&#160;</td>
			<td>Gibco</td>
			<td>10437-077</td>
			<td></td>
		</tr>
		<tr>
			<td>Penicillin Streptomycin&#160;&#160;</td>
			<td>Thermo Ficher Sci</td>
			<td>15140-122</td>
			<td></td>
		</tr>
		<tr>
			<td>Matrigel HC&#160;</td>
			<td>Corning&#160;</td>
			<td>354248</td>
			<td></td>
		</tr>
		<tr>
			<td>SutureVet PGA 6-0 PGA</td>
			<td>Henry Schein</td>
			<td>39010</td>
			<td></td>
		</tr>
		<tr>
			<td>Alcare or Foamed Antiseptic Handrub</td>
			<td>Steris</td>
			<td>639680</td>
			<td></td>
		</tr>
		<tr>
			<td>DPBS (Dubelcco&#39;s Phosphate-Buffered saline)&#160;</td>
			<td>Thermo Ficher Sci</td>
			<td>21300025</td>
			<td></td>
		</tr>
		<tr>
			<td>TB Syringe 27G1/2</td>
			<td>Becton Dickinson</td>
			<td>305620</td>
			<td></td>
		</tr>
		<tr>
			<td>Isoflurane&#160;</td>
			<td>Blutler Schein</td>
			<td>50562</td>
			<td></td>
		</tr>
		<tr>
			<td>Ketoprofen&#160;</td>
			<td>Fort Dodge Animal Health&#160;</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Surgical Scissors, 5.5&#34;straight mayo&#160;</td>
			<td>Henry Schein</td>
			<td>22-1600</td>
			<td></td>
		</tr>
		<tr>
			<td>PANC-1 GFP cell line&#160;</td>
			<td>Anticancer, Inc</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Small Animal Imaging System:</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>iBOx Scientia, UVP :</td>
			<td>UVP, LLC&#160; Upland, CA.&#160;</td>
			<td colspan="2">Small Animal Imaging System to observe the fluorescent tumor in live animals</td>
		</tr>
	</tbody>
</table>

fluorescent orthotopic mouse model of pancreatic cancer

Pancreatic cancer remains one of the cancers for which survival has not improved substantially in the last few decades. Only 7% of diagnosed patients will survive longer than five years. In order to understand and mimic the microenvironment of pancreatic tumors, we utilized a murine orthotopic model of pancreatic cancer that allows non-invasive imaging of tumor progression in real time. Pancreatic cancer cells expressing green fluorescent protein (PANC-1 GFP) were suspended in basement membrane matrix, high concentration, (e.g., Matrigel HC) with serum-free media and then injected into the tail of the pancreas via laparotomy. The cell suspension in the high concentration basement membrane matrix becomes a gel-like substance once it reaches room temperature; therefore, it gels when it comes in contact with the pancreas, creating a seal at the injection site and preventing any cell leakage. Tumor growth and metastasis to other organs are monitored in live animals by using fluorescence. It is critical to use the appropriate filters for excitation and emission of GFP. The steps for the orthotopic implantation are detailed in this article so researchers can easily replicate the procedure in nude mice. The main steps of this protocol are preparation of the cell suspension, surgical implantation, and whole body fluorescent in vivo imaging. This orthotopic model is designed to investigate the efficacy of novel therapeutics on primary and metastatic tumors.

This method describes a surgical orthotopic implantation of fluorescent human pancreatic cancer cells, focusing on the preparation of the cell suspension for injection, proper anesthesia for rodents, delivery of cell suspension via laparotomy, and the use of fluorescent in vivo small animal imaging. The detection of a green fluorescence signal (GFP signal) between two and three weeks post-implantation, provides researchers a visual cue to confirm the presence of a developing panc...

Watch this Scientific Journal Video about Fluorescent Orthotopic Mouse Model of Pancreatic Cancer at JoVE.com

Fluorescent Orthotopic Mouse Model of Pancreatic Cancer

A procedure to implant green fluorescent protein-expressing pancreatic cancer cells (PANC-1 GFP) orthotopically into the pancreas of Balb-c Ola Hsd-Fox1nu mice to assess tumor progression and metastasis is presented here.

Pancreatic cancer remains one of the cancers for which survival has not improved substantially in the last few decades. Only 7% of diagnosed patients will ...

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