The authors thank Dr. Julia Mannheim, Walter Ehrlichmann, Ramona Stumm, Funda Cay, Daniel Bukala, Maren Harant as well as Natalie Altmeyer for the support during the experiments and data analysis. This work was supported by the Werner Siemens-Foundation, the DFG through the SFB685 (project B6) and Fort&#252;ne (2309-0-0).

Safety Precautions: When handling radioactivity, store 64Cu behind 2-inch-thick lead bricks and use respective shielding for all vessels carrying activity. Use appropriate tools to indirectly handle unshielded sources to avoid direct hand contact and minimize exposure to radioactive material. Always wear radiation dosimetry monitoring badges and personal protection equipment and check oneself and the working area for contamination to immediately address it. Discard potentially contaminated personal protection ...

<ol>
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This protocol presents a reliable and easy method to stably radiolabel cells for in vivo tracking by PET. Utilizing this method, cOVA-TH1 cells, isolated and expanded in vitro from donor mice, could be radiolabeled with 64Cu-DOTA-KJ1-26-mAb and their homing was tracked to the pulmonary and perithymic LNs as sites of cOVA presentation in a cOVA-induced acute airway DTHR.
The modification of the mAb with the chelator requires fast and efficient working and the use of...

Non-invasive cell tracking is a versatile tool to monitor cell function, migration and homing in vivo. Recent cell tracking studies have focused on mesenchymal1,2 or bone-marrow derived stem cells3 in the context of regenerative medicine, autologous peripheral white blood cells in inflammation or T lymphocytes in adoptive cell therapies against cancer3,4. The elucidation of the sites of action and the underlying biological principles of cell-based therapies is of tremendous importance. CD8+ cytotoxic T lymphocytes, genetically engineered chimeric antigen receptor (CAR) T cells or tumor-infiltrating lymphocytes (TILs) were widely considered as the gold standard. However, tumor-associated antigen-specific TH1 cells have proven to be an effective alternative treatment option4,5,6,7.
As key players in inflammation, organ-specific autoimmune diseases (e.g., rheumatoid arthritis or bronchial asthma), and cells of high interest in cancer immunotherapy, it is important to characterize the temporal distribution and homing patterns of TH1 cells. Noninvasive in vivo imaging by PET presents a quantitative, highly sensitive method8 to examine cell migration patterns, in vivo homing, and the sites of T cell action and responses during inflammation, allergies, infections or tumor rejection9,10,11.
Clinically, 111In-oxine is used for leukocyte scintigraphy for the discrimination of inflammation and infection12, while 2-deoxy-2-(18F)fluoro-D-glucose (18F-FDG) is commonly used for cell tracking studies by PET3,13. One major disadvantage of this PET tracer, however, is the short half-life of the radionuclide 18F at 109.7 min and the low intracellular stability that impedes imaging at later time points post adoptive cell transfer. For longer term in vivo cell tracking studies by PET, although unstable in the cells, 64Cu-PTSM is frequently used to nonspecifically label cells14,15 with minimized detrimental effects on T cell viability and function16.
This protocol describes a method to further reduce disadvantageous effects on cell viability and function using a T cell receptor (TCR)-specific radiolabeled mAb. First, the production of the radioisotope 64Cu, the conjugation of the mAb KJ1-26 with the chelator DOTA, and the subsequent 64Cu-radiolabeling are shown. In a second step, the isolation and expansion of cOVA-TH1 cells of DO11.10 donor mice and the radiolabeling with 64Cu-loaded DOTA-conjugated mAb KJ1-26 (64Cu-DOTA-KJ1-26) are described in detail. The assessment of uptake values and efflux of radioactivity with a dose calibrator and by &#947;-counting, respectively, as well as the evaluation of the effects of 64Cu-radiolabeling on cell viability by trypan blue exclusion and functionality with IFN-&#947; ELISA are presented. For non-invasive in vivo cell tracking, the elicitation of a mouse model of cOVA-induced acute airway DTHR and image acquisition by PET/CT after adoptive cell transfer are described.
Moreover, this labeling approach can be transferred to different disease models, murine T cells with different TCRs or general cells of interest with membrane-bound receptors or expression markers underlying continuous membrane shuttling17.

<table border="0" cellpadding="0" cellspacing="0" width="966">
	<tbody>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">HCl, Suprapur</td>
			<td style="width:227px;">Merck, Darmstadt, Germany</td>
			<td style="width:259px;">1.00318</td>
			<td style="width:189px;">64Cu production</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">Methanol, Suprapur</td>
			<td style="width:227px;">Merck, Darmstadt, Germany</td>
			<td>1.06007</td>
			<td>64Cu production</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">Isopropanol, Suprapur</td>
			<td style="width:227px;">Merck, Darmstadt, Germany</td>
			<td>1.0104</td>
			<td>64Cu production</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">Pt/Ir (90/10) plate</td>
			<td style="width:227px;">&#214;gussa</td>
			<td style="width:259px;">Custom made</td>
			<td>64Cu production</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">PEEK chamber</td>
			<td style="width:227px;">&#214;gussa</td>
			<td style="width:259px;">Custom made</td>
			<td>64Cu production</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">64Ni</td>
			<td style="width:227px;">Chemotrade</td>
			<td style="width:259px;"></td>
			<td>64Cu production</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">Polygram SIL G/UV 254 plate</td>
			<td style="width:227px;">Macherey-Nagel</td>
			<td style="width:259px;">805021</td>
			<td>64Cu production</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">Ion exchange column</td>
			<td style="width:227px;">BioRad</td>
			<td style="width:259px;">AG1-X8</td>
			<td>64Cu production</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Solid state target system for PETtrace</td>
			<td style="width:227px;">WKL</td>
			<td style="width:259px;">costum made</td>
			<td>64Cu production</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">64Cu work-up module</td>
			<td style="width:227px;">WKL</td>
			<td style="width:259px;">costum made</td>
			<td>64Cu production</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Dose calibrator</td>
			<td style="width:227px;">Capintec</td>
			<td style="width:259px;">CRC-25R</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">PETtrace cyclotron</td>
			<td style="width:227px;">General Electric Medical Systems</td>
			<td style="width:259px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">DOTA-NHS</td>
			<td style="width:227px;">Macrocyclics</td>
			<td style="width:259px;">B-280</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Anti-cOVA-TCR antibody (KJ1-26)</td>
			<td style="width:227px;"></td>
			<td>Isolated from hybridoma cell culture</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="26">
			<td height="26" style="height:26px;width:292px;">Na2HPO4</td>
			<td style="width:227px;">Sigma-Aldrich</td>
			<td style="width:259px;">71633</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:292px;">H+ Chelex 100</td>
			<td style="width:227px;">Sigma-Aldrich</td>
			<td style="width:259px;">C7901</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Amicon Ultra-15 filter unit</td>
			<td style="width:227px;">Merck Millipore</td>
			<td style="width:259px;">UFC910008</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Rotipuran ultrapure water</td>
			<td style="width:227px;">Carl Roth</td>
			<td style="width:259px;">HN68.3</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Ammonium acetate</td>
			<td style="width:227px;">Sigma-Aldrich</td>
			<td>32301</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">PBS</td>
			<td style="width:227px;">University Tuebingen</td>
			<td style="width:259px;"></td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Micro Bio-spin P-6 column</td>
			<td style="width:227px;">Bio-Rad Laboratories</td>
			<td style="width:259px;">7326221</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Sodium citrate</td>
			<td style="width:227px;">Sigma-Aldrich</td>
			<td style="width:259px;">71497</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Cyclone Plus PhosphorImager&#160;</td>
			<td style="width:227px;">Perkin-Elmer</td>
			<td>L2250116</td>
			<td>DOTA-conjugation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">DMEM</td>
			<td style="width:227px;">Merck Millipore</td>
			<td>102568</td>
			<td>ingredient for T cell medium&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">FCS</td>
			<td style="width:227px;">Merck Millipore</td>
			<td style="width:259px;">S0115/1004B</td>
			<td>ingredient for T cell medium&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Sodium pyruvate</td>
			<td style="width:227px;">Merck Millipore</td>
			<td style="width:259px;">L0473</td>
			<td>ingredient for T cell medium&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">MEM-amino acids</td>
			<td style="width:227px;">Merck Millipore</td>
			<td style="width:259px;">K0293</td>
			<td>ingredient for T cell medium&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">HEPES&#160;</td>
			<td style="width:227px;">Merck Millipore</td>
			<td style="width:259px;">L 1613</td>
			<td>ingredient for T cell medium&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">&#160;Penicillin/Streptomycin</td>
			<td style="width:227px;">Merck Millipore</td>
			<td style="width:259px;">A2212</td>
			<td>ingredient for T cell medium&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">0.05 mM 2-&#946;-mercaptoethanol</td>
			<td style="width:227px;">Sigma-Aldrich</td>
			<td style="width:259px;">M3148</td>
			<td>ingredient for T cell medium&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">DO11.10 mice</td>
			<td style="width:227px;"></td>
			<td>in-house breeding</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">DPBS</td>
			<td style="width:227px;">Gibco</td>
			<td style="width:259px;">14190144</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Cell strainer 40 &#181;m&#160;</td>
			<td style="width:227px;">Corning</td>
			<td style="width:259px;">352340</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">ACK Lysing Buffer</td>
			<td style="width:227px;">Lonza</td>
			<td style="width:259px;">10-548E</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">CD4 MicroBeads, mouse</td>
			<td style="width:227px;">Miltenyi Biotech</td>
			<td style="width:259px;">130-097-145</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">QuadroMACS separator</td>
			<td style="width:227px;">Miltenyi Biotech</td>
			<td style="width:259px;">130-090-976</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">LS column</td>
			<td style="width:227px;">Miltenyi Biotech</td>
			<td style="width:259px;">130-042-401</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">anti-CD4 antibody (Gk1.5)</td>
			<td style="width:227px;"></td>
			<td>Isolated from hybridoma cell culture</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">anti-CD8 antibody (5367.2)</td>
			<td style="width:227px;"></td>
			<td>Isolated from hybridoma cell culture</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Anti-rat antibody (MAR18.5)</td>
			<td style="width:227px;"></td>
			<td>Isolated from hybridoma cell culture</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Rabbit complement MA</td>
			<td style="width:227px;">tebu-Bio</td>
			<td style="width:259px;">CL3221</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Anti-IL-4 antibody (11B11)</td>
			<td style="width:227px;"></td>
			<td>Isolated from hybridoma cell culture</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">cOVA 323-339-peptide&#160;</td>
			<td style="width:227px;">EMC-micro-collections</td>
			<td>Custom order</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">CPG1668-oligonucleotides</td>
			<td style="width:227px;">Eurofins MWG Operon</td>
			<td>Custom order</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">IL-2</td>
			<td style="width:227px;">Novartis</td>
			<td>65483-116-07</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">96-well plates</td>
			<td style="width:227px;">Greiner&#160;</td>
			<td>655180</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">24-well plates</td>
			<td style="width:227px;">Greiner&#160;</td>
			<td>662160</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">cell culture flask</td>
			<td style="width:227px;">Greiner&#160;</td>
			<td>660175</td>
			<td>TH1 cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">48-well plates</td>
			<td style="width:227px;">Greiner&#160;</td>
			<td>677 180</td>
			<td>cell labeling</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Gammacell 1000</td>
			<td style="width:227px;">Best Theratronics</td>
			<td>via inquiry&#160;</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Gulmay RT225</td>
			<td style="width:227px;">Gulmay</td>
			<td>via inquiry&#160;</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Trypan blue</td>
			<td style="width:227px;">Merck Millipore</td>
			<td style="width:259px;">L6323</td>
			<td>in vitro evaluation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Mouse IFN-&#947; ELISA</td>
			<td style="width:227px;">BD Biosciences</td>
			<td style="width:259px;">558258</td>
			<td>in vitro evaluation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">PE Annexin V Apoptosis Detection Kit&#160;</td>
			<td style="width:227px;">BD Biosciences</td>
			<td style="width:259px;">559763</td>
			<td>in vitro evaluation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Tube 5 ml</td>
			<td style="width:227px;">Sarstedt</td>
			<td style="width:259px;">55.476</td>
			<td>in vitro evaluation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Round-bottom tubes&#160;</td>
			<td style="width:227px;">BD Biosciences</td>
			<td style="width:259px;">352008</td>
			<td>in vitro evaluation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Wizard &#947;-counter</td>
			<td style="width:227px;">Perkin-Elmer</td>
			<td>2480-0010</td>
			<td>in vitro evaluation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">ELISA Reader MultiscanEX</td>
			<td style="width:227px;">Thermo Fisher Scientific</td>
			<td>51118177</td>
			<td>in vitro evaluation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Microscope</td>
			<td style="width:227px;">Leica</td>
			<td>via inquiry&#160;</td>
			<td>in vitro evaluation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">BD LSRII&#160;</td>
			<td style="width:227px;">BD Biosciences</td>
			<td>via inquiry&#160;</td>
			<td>in vitro evaluation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">BALB/c mice</td>
			<td style="width:227px;">Charles River</td>
			<td style="width:259px;">028</td>
			<td>in vivo cell trafficking</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Aluminum gel</td>
			<td style="width:227px;">Serva Electrophoresis</td>
			<td style="width:259px;">12261.01</td>
			<td>in vivo cell trafficking</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Xylazine</td>
			<td style="width:227px;">Bayer HealthCare</td>
			<td>Ordered via University hospital</td>
			<td>in vivo cell trafficking</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Ketamine</td>
			<td style="width:227px;">Ratiopharm</td>
			<td>Ordered via University hospital</td>
			<td>in vivo cell trafficking</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Isoflurane</td>
			<td style="width:227px;">CP-Pharma</td>
			<td>Ordered via University hospital</td>
			<td>in vivo cell trafficking</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">30G needle</td>
			<td style="width:227px;">BD Biosciences</td>
			<td>304000</td>
			<td>in vivo cell trafficking</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Syringe</td>
			<td style="width:227px;">BD Biosciences</td>
			<td>11612491</td>
			<td>in vivo cell trafficking</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Capillaries 10 &#181;l</td>
			<td style="width:227px;">VWR</td>
			<td>612-2439</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Inveon PET scanner</td>
			<td style="width:227px;">Siemens Healthineers</td>
			<td style="width:259px;">no longer available</td>
			<td>in vivo cell trafficking, alternative companies: Bruker, Mediso&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Inveon SPECT/CT scanner</td>
			<td style="width:227px;">Siemens Healthineers</td>
			<td style="width:259px;">no longer available</td>
			<td>in vivo cell trafficking</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:292px;">Inveon Research Workplace</td>
			<td style="width:227px;">Siemens Healthineers</td>
			<td style="width:259px;"></td>
			<td>image analysis, alternative software: Pmod</td>
		</tr>
	</tbody>
</table>

murine lymphocyte labeling by 64cu-antibody receptor targeting for in vivo cell trafficking by pet/ct

This protocol illustrates the production of 64Cu and the chelator conjugation/radiolabeling of a monoclonal antibody (mAb) followed by murine lymphocyte cell culture and 64Cu-antibody receptor targeting of the cells. In vitro evaluation of the radiolabel and non-invasive in vivo cell tracking in an animal model of an airway delayed-type hypersensitivity reaction (DTHR) by PET/CT are described.
In detail, the conjugation of a mAb with the chelator 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) is shown. Following the production of radioactive 64Cu, radiolabeling of the DOTA-conjugated mAb is described. Next, the expansion of chicken ovalbumin (cOVA)-specific CD4+ interferon (IFN)-&#947;-producing T helper cells (cOVA-TH1) and the subsequent radiolabeling of the cOVA-TH1 cells are depicted. Various in vitro techniques are presented to evaluate the effects of 64Cu-radiolabeling on the cells, such as the determination of cell viability by trypan blue exclusion, the staining for apoptosis with Annexin V for flow cytometry, and the assessment of functionality by IFN-&#947; enzyme-linked immunosorbent assay (ELISA). Furthermore, the determination of the radioactive uptake into the cells and the labeling stability are described in detail. This protocol further describes how to perform cell tracking studies in an animal model for an airway DTHR and, therefore, the induction of cOVA-induced acute airway DHTR in BALB/c mice is included. Finally, a robust PET/CT workflow including image acquisition, reconstruction, and analysis is presented.
The 64Cu-antibody receptor targeting approach with subsequent receptor internalization provides high specificity and stability, reduced cellular toxicity, and low efflux rates compared to common PET-tracers for cell labeling, e.g.64Cu-pyruvaldehyde bis(N4-methylthiosemicarbazone) (64Cu-PTSM). Finally, our approach enables non-invasive in vivo cell tracking by PET/CT with an optimal signal-to-background ratio for 48 h. This experimental approach can be transferred to different animal models and cell types with membrane-bound receptors that are internalized.

Figure 1 summarizes the labeling of cOVA-TH1 cells with the 64Cu-DOTA-KJ1-26-mAb and the experimental design for the in vitro and in vivo studies covered in this protocol.
<img alt="Figure 1" src="/files/ftp_upload/55270/55270fig1.jpg" /> 
Figure 1: 64Cu-DOTA-KJ1-26-mAb Labeling Process &#38; Experimental Design. (A) Schematic represe...

Watch this Scientific Journal Video about Murine Lymphocyte Labeling by 64Cu-Antibody Receptor Targeting for In Vivo  Cell Trafficking by PET/CT at JoVE.com

Murine Lymphocyte Labeling by 64Cu-Antibody Receptor Targeting for In Vivo  Cell Trafficking by PET/CT

Following the preparation of a 64Cu-modified monoclonal antibody binding to a transgenic murine T cell receptor, T cells are radiolabeled in vivo, analyzed for viability, functionality, labeling stability and apoptosis, and adoptively transferred into mice with an airway delayed-type hypersensitivity reaction for non-invasive imaging by positron emission tomography/computed tomography (PET/CT).

Murine Lymphocyte Labeling by 64Cu-Antibody Receptor Targeting for In Vivo Cell Trafficking by PET/CT

This protocol illustrates the production of 64Cu and the chelator conjugation/radiolabeling of a monoclonal antibody (mAb) followed by murine lymphocyte ...

The overall goal of this procedure is to stably label murine lymphocytes with a copper-modified radioactive monoclonal antibody to track lymphocyte temporal distribution and homing patterns in vivo by PET/CT in mouse models of inflammation or cancer. This method can help elucidate the sites of action and the key underlying biological principles of cell-based therapies, such as stem cell therapies in regenerative medicine or cancer immunotherapies. The main advantage of this technique is that it permits the imaging of cell migration over 48 hours with a high contrast and minimal detrimental effects on the cells.This method can be easily transferred to any cell type of interest with specific membrane-bound receptors and corresponding monoclonal antibodies. Generally, individuals new to this method may struggle with the chelator conjugation and radiolabeling processes, resulting in a lower immunoreactive fraction and cell-specific activity. Begin by disinfecting a DO11.10 mouse with 70%ethanol.Then fix the limbs with adhesive tape, and make a medial incision along the abdomen of the animal. Laterally pull both sides of the incision, separate the skin from the peritoneum, and locate the cervical, axial, brachial, and inguinal lymph nodes. Using blunt forceps, transfer the lymph nodes into a container of 1%FCS in PBS.Then open the peritoneum, separate the spleen from the pancreas and connective tissue, and store the spleen with the lymph nodes. When all of the tissues have been collected, transfer the samples onto a 40-micron filter in a 15-milliliter conical tube, and use a syringe plunger to macerate the tissues. Then rinse the filter with 10 milliliters of FCS in PBS, and collect the single-cell suspension by centrifugation.After lysing the red blood cells, resuspend the white blood cell pellet in fresh PBS plus FCS and CD4-positive MicroBeads according to the manufacturer's instructions. After 20 minutes at four degrees Celsius, wash the cells in up to 50 milliliters of fresh PBS plus FCS buffer, and resuspend the cells in the appropriate volume of PBS plus FCS for magnetic column elution of the CD4-negative cell populations. Load the cells onto a magnetic cell separation column, and collect the flow-through in a 15-milliliter conical tube.At the end of the magnetic cell separation, use the plunger to flush the CD4-positive cell population into a new conical tube, and adjust the isolated CD4-positive T cell suspension concentration to one times 10 to the six cells per milliliter in fresh complete medium for four degrees Celsius storage. Collect the CD4-negative cells by centrifugation. Resuspend the pellet in anti-CD4, anti-CD8, mouse anti-rat monoclonal antibodies, and rabbit complement, and incubate for 45 minutes at 37 degrees Celsius.After collecting the cells by centrifugation, resuspend the pellet in three milliliters of fresh complete medium, and irradiate the negatively selected antigen-presenting cells at 30 grays. Adjust the antigen-presenting cell concentration to five times 10 to the six cells per milliliter in fresh complete medium, and add 100 microliters of CD4-positive T cells and 100 microliters of antigen-presenting cells into the appropriate experimental wells of a 96-well flat bottom plate. Then add the appropriate stimuli to each well, and transfer the plate to a cell culture incubator.For chicken ovalbumin-specific TH1 cell radiolabeling, first use a dose calibrator to draw 37 megabecquerels of the T cell-specific radioactive antibody of interest into a syringe without dead volume. Next, dispense the antibody into a reaction cup, and measure and subtract the remaining amount of reactivity in the syringe from the amount that was drawn. Then add one milliliter of saline to the cup to generate a 37-megabecquerel-per-milliliter solution.Next, add two times 10 to the six OVA-TH1 cells in 0.5 milliliters of complete medium to each well of a 48-well plate, followed by 20 microliters of the radiolabeled antibody solution. After 30 minutes in a radiation-safe, 37-degrees Celsius, and 7.5%carbon dioxide cell culture incubator, pool the radiolabeled cells in a 50-milliliter conical tube for two washes in 10 milliliters of 37 degrees Celsius PBS. To measure the radiolabeled antibody uptake and efflux, immediately after the second wash, transfer one times 10 to the six monoclonal antibody-labeled OVA-TH1 cells in one milliliter of complete medium into each of 10 gamma counting tubes.Pellet the cells by centrifugation, and transfer the supernatants into 10 new gamma counting tubes. Next, wash the cells in one milliliter of complete medium to remove any unbound radiolabeled monoclonal antibody, and transfer the supernatants into 10 new gamma counting tubes. Then add one milliliter of fresh complete medium to the cells, and measure the initial uptake values in a gamma counter.For in vivo PET/CT imaging, immediately after radiolabeling, adjust the OVA-TH1 cells to a five times 10 to the seven cells per milliliter concentration in PBS, and draw 200 microliters of cells into a one-milliliter syringe equipped with a 30-gauge needle. Inject the cells intraperitoneally into an ova delayed-type hypersensitivity reaction diseased animal between the fourth and fifth nipple. Then, to facilitate co-registration of the PET and CT images during the image analysis, fix glass capillaries containing radiolabeled antibody solution under a small animal bed.When the appropriate level of sedation is reached, apply ointment to the animal's eyes and use cotton swabs and surgical tape to immobilize the mouse on the bed. Mouse the mouse bed to the PET scanner, and center the field of view with a focus on the lungs to acquire a 20-minute static PET scan with an energy window of 350 to 650 kiloelectron volts. Transfer the mouse bed to the CT scanner.Via scout view, center the field of view on the lungs. Acquire a planar CT image via 360 projections during a 360-degree rotation in the step-and-shoot mode with an exposition time of 350 milliseconds and a binning factor of four. The applied radioactive dose of 0.7 megabecquerels reduces the TH1 cell viability by only 8%while higher doses demonstrate an even more pronounced effect.Compared to radiolabeling with copper-PTSM however, no significant advantage for the radiolabeled antibody is observed. T cell-specific radioactive antibody-labeled TH1 cells demonstrate no loss in functionality as evidences by interferon gamma secretion, a decreased efflux of radioactivity, and a reduced induction of apoptosis compared to copper-PTSM-labeled TH1 cells. Here, representative high-resolution static PET and anatomical CT images after adoptive transfer of the monoclonal antibody radiolabeled cells are shown, with the images fused in the coronal, axial, and sagittal view with the help of glass capillaries placed as just demonstrated.Volumes of interest were drawn on the pulmonary and perithymic lymph nodes on the decay-corrected and normalized PET images to calculate the percentage of injected dose per cubic centimeter. OVA-TH1 cell migration tracking to the pulmonary and perithymic lymph nodes as ova presentation sites in an airway delayed-type hypersensitivity reaction reveals that the in vivo PET signals derived from the monoclonal antibody radiolabeled OVA-TH1 cells are considerably higher than the signals from the copper-PTSM-labeled cells. Further, the OVA-TH1 cell uptake values were significantly increased in the delayed-type hypersensitivity reaction diseased animals compared to their untreated control littermates.Once mastered, this technique can be used to study the specific roles and sites of action of immune cells in animal models of human disease. While attempting this procedure, it's important to remember that each cell type might react differently to radioactivity and to adjust the amount of radioactivity used for the labeling accordingly. After watching this video, you should have a good understanding of how to isolate and culture antigen-specific T cells, label these cells with a radioactive antibody, and image their distribution and homing kinetics with PET/CT.Don't forget that working with radioactivity can be extremely hazardous and that precautions such as using proper lead shielding, minimizing exposure times, and maximizing the distance to the radioactive source should always be taken while performing this procedure.

Research

JoVE Journal

Immunology and Infection

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Quantifying Human Monocyte Chemotaxis In Vitro and Murine Lymphocyte Trafficking In Vivo

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