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Novel (89)Zr cell labeling approach for PET-based cell trafficking studies.

Bansal A, Pandey MK, Demirhan YE, Nesbitt JJ, Crespo-Diaz RJ, Terzic A, Behfar A, DeGrado TR - EJNMMI Res (2015)

Bottom Line: The effect of labeling on cellular viability was tested by proliferation, trypan blue, and cytotoxicity/apoptosis assays.Radioactivity concentrations of labeled cells of up to 0.5 MBq/10(6) cells were achieved without a negative effect on cellular viability.We have developed a robust, general, and biostable (89)Zr-DBN-based cell labeling strategy with promise for wide applications of PET-based non-invasive in vivo cell trafficking.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Mayo Clinic, Rochester, 55905 MN USA.

ABSTRACT

Background: With the recent growth of interest in cell-based therapies and radiolabeled cell products, there is a need to develop more robust cell labeling and imaging methods for in vivo tracking of living cells. This study describes evaluation of a novel cell labeling approach with the positron emission tomography (PET) isotope (89)Zr (T 1/2 = 78.4 h). (89)Zr may allow PET imaging measurements for several weeks and take advantage of the high sensitivity of PET imaging.

Methods: A novel cell labeling agent, (89)Zr-desferrioxamine-NCS ((89)Zr-DBN), was synthesized. Mouse-derived melanoma cells (mMCs), dendritic cells (mDCs), and human mesenchymal stem cells (hMSCs) were covalently labeled with (89)Zr-DBN via the reaction between the NCS group on (89)Zr-DBN and primary amine groups present on cell surface membrane protein. The stability of the label on the cell was tested by cell efflux studies for 7 days. The effect of labeling on cellular viability was tested by proliferation, trypan blue, and cytotoxicity/apoptosis assays. The stability of label was also studied in in vivo mouse models by serial PET scans and ex vivo biodistribution following intravenous and intramyocardial injection of (89)Zr-labeled hMSCs. For comparison, imaging experiments were performed after intravenous injections of (89)Zr hydrogen phosphate ((89)Zr(HPO4)2).

Results: The labeling agent, (89)Zr-DBN, was prepared in 55% ± 5% decay-corrected radiochemical yield measured by silica gel iTLC. The cell labeling efficiency was 30% to 50% after 30 min labeling depending on cell type. Radioactivity concentrations of labeled cells of up to 0.5 MBq/10(6) cells were achieved without a negative effect on cellular viability. Cell efflux studies showed high stability of the radiolabel out to 7 days. Myocardially delivered (89)Zr-labeled hMSCs showed retention in the myocardium, as well as redistribution to the lung, liver, and bone. Intravenously administered (89)Zr-labeled hMSCs also distributed primarily to the lung, liver, and bone, whereas intravenous (89)Zr(HPO4)2 distributed to the liver and bone with no activity in the lung. Thus, the in vivo stability of the radiolabel on the hMSCs was evidenced.

Conclusions: We have developed a robust, general, and biostable (89)Zr-DBN-based cell labeling strategy with promise for wide applications of PET-based non-invasive in vivo cell trafficking.

No MeSH data available.


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Scheme for synthesis of89Zr-DBN and cell labeling.
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Fig1: Scheme for synthesis of89Zr-DBN and cell labeling.

Mentions: In this study, we propose a novel cell labeling strategy that covalently binds a 89Zr-DFO-labeled agent to cell surface proteins independent of cell type. The novel method employs the two-step process (Figure 1): 1) preparation of 89Zr-labeled p-isothiocyanato-benzyl-desferrioxamine (89Zr-DBN) and 2) random labeling of primary amines of cell surface proteins with 89Zr-DBN. We have evaluated this labeling strategy in three cell types: mouse melanoma cells (mMCs), human mesenchymal stem cells (hMSCs), and mouse dendritic cells (mDCs). The labeled cells were evaluated for 7 days post-labeling for label retention and probable changes in cell proliferation, cell viability, and degree of apoptosis in radiolabeled cells as compared to their unlabeled counterparts. Out of these, labeled hMSCs were further tested for imaging characteristics and stability of radiolabel in an in vivo mouse model.Figure 1


Novel (89)Zr cell labeling approach for PET-based cell trafficking studies.

Bansal A, Pandey MK, Demirhan YE, Nesbitt JJ, Crespo-Diaz RJ, Terzic A, Behfar A, DeGrado TR - EJNMMI Res (2015)

Scheme for synthesis of89Zr-DBN and cell labeling.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4401478&req=5

Fig1: Scheme for synthesis of89Zr-DBN and cell labeling.
Mentions: In this study, we propose a novel cell labeling strategy that covalently binds a 89Zr-DFO-labeled agent to cell surface proteins independent of cell type. The novel method employs the two-step process (Figure 1): 1) preparation of 89Zr-labeled p-isothiocyanato-benzyl-desferrioxamine (89Zr-DBN) and 2) random labeling of primary amines of cell surface proteins with 89Zr-DBN. We have evaluated this labeling strategy in three cell types: mouse melanoma cells (mMCs), human mesenchymal stem cells (hMSCs), and mouse dendritic cells (mDCs). The labeled cells were evaluated for 7 days post-labeling for label retention and probable changes in cell proliferation, cell viability, and degree of apoptosis in radiolabeled cells as compared to their unlabeled counterparts. Out of these, labeled hMSCs were further tested for imaging characteristics and stability of radiolabel in an in vivo mouse model.Figure 1

Bottom Line: The effect of labeling on cellular viability was tested by proliferation, trypan blue, and cytotoxicity/apoptosis assays.Radioactivity concentrations of labeled cells of up to 0.5 MBq/10(6) cells were achieved without a negative effect on cellular viability.We have developed a robust, general, and biostable (89)Zr-DBN-based cell labeling strategy with promise for wide applications of PET-based non-invasive in vivo cell trafficking.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Mayo Clinic, Rochester, 55905 MN USA.

ABSTRACT

Background: With the recent growth of interest in cell-based therapies and radiolabeled cell products, there is a need to develop more robust cell labeling and imaging methods for in vivo tracking of living cells. This study describes evaluation of a novel cell labeling approach with the positron emission tomography (PET) isotope (89)Zr (T 1/2 = 78.4 h). (89)Zr may allow PET imaging measurements for several weeks and take advantage of the high sensitivity of PET imaging.

Methods: A novel cell labeling agent, (89)Zr-desferrioxamine-NCS ((89)Zr-DBN), was synthesized. Mouse-derived melanoma cells (mMCs), dendritic cells (mDCs), and human mesenchymal stem cells (hMSCs) were covalently labeled with (89)Zr-DBN via the reaction between the NCS group on (89)Zr-DBN and primary amine groups present on cell surface membrane protein. The stability of the label on the cell was tested by cell efflux studies for 7 days. The effect of labeling on cellular viability was tested by proliferation, trypan blue, and cytotoxicity/apoptosis assays. The stability of label was also studied in in vivo mouse models by serial PET scans and ex vivo biodistribution following intravenous and intramyocardial injection of (89)Zr-labeled hMSCs. For comparison, imaging experiments were performed after intravenous injections of (89)Zr hydrogen phosphate ((89)Zr(HPO4)2).

Results: The labeling agent, (89)Zr-DBN, was prepared in 55% ± 5% decay-corrected radiochemical yield measured by silica gel iTLC. The cell labeling efficiency was 30% to 50% after 30 min labeling depending on cell type. Radioactivity concentrations of labeled cells of up to 0.5 MBq/10(6) cells were achieved without a negative effect on cellular viability. Cell efflux studies showed high stability of the radiolabel out to 7 days. Myocardially delivered (89)Zr-labeled hMSCs showed retention in the myocardium, as well as redistribution to the lung, liver, and bone. Intravenously administered (89)Zr-labeled hMSCs also distributed primarily to the lung, liver, and bone, whereas intravenous (89)Zr(HPO4)2 distributed to the liver and bone with no activity in the lung. Thus, the in vivo stability of the radiolabel on the hMSCs was evidenced.

Conclusions: We have developed a robust, general, and biostable (89)Zr-DBN-based cell labeling strategy with promise for wide applications of PET-based non-invasive in vivo cell trafficking.

No MeSH data available.


Related in: MedlinePlus